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From: TSS ()
Subject: Re: Association between Deposition of Beta-Amyloid and Pathological Prion Protein in Sporadic Creutzfeldt-Jakob Disease
Date: March 27, 2008 at 10:57 am PST

In Reply to: Re: Association between Deposition of Beta-Amyloid and Pathological Prion Protein in Sporadic Creutzfeldt-Jakob Disease posted by TSS on March 27, 2008 at 10:45 am:


Friday, March 21, 2008
Association between Deposition of Beta-Amyloid and Pathological Prion Protein in Sporadic Creutzfeldt-Jakob Disease

Original Paper

Association between Deposition of Beta-Amyloid and Pathological Prion
Protein in Sporadic Creutzfeldt-Jakob Disease

Laura Debatina, Johannes Strefferb, Markus Geissenc, Jakob Matschkec,
Adriano Aguzzia, Markus Glatzela, c

aInstitute of Neuropathology, and
bDivision of Psychiatry Research, University Hospital Zurich, Zurich,
Switzerland;
cInstitute of Neuropathology, University Medical Center Hamburg-Eppendorf,
Hamburg, Germany


Address of Corresponding Author

Neurodegenerative Dis (DOI: 10.1159/000121389)


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Key Words

Sporadic Creutzfeldt-Jakob disease
Alzheimer's disease
Deposition of -amyloid
Prion protein

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Abstract

Background: Alzheimer's disease (AD) and prion diseases such as sporadic
Creutzfeldt-Jakob disease (sCJD) share common features concerning their
molecular pathogenesis and neuropathological presentation and the
coexistence of AD and CJD in patients suggest an association between the
deposition of the proteolytically processed form of the amyloid precursor
protein, -amyloid (A), which deposits in AD, and the abnormal form of the
prion protein, PrPSc, which deposits in sCJD. Methods: We have characterized
sCJD patients (n = 14), AD patients (n = 5) and nondemented controls (n = 5)
with respect to the deposition of PrPSc and A morphologically, biochemically
and genetically and correlated these findings to clinical data. Results:
sCJD-diseased individuals with abundant deposits of A present with a
specific clinicopathological profile, defined by higher age at disease
onset, long disease duration, a genetic profile and only minimal amounts of
PrPSc in the cerebellum. Conclusion: The co-occurrence of pathological
changes typical for sCJD and AD in combination with the inverse association
between accumulation of A and PrPSc in a subgroup of sCJD patients is
indicative of common pathways involved in the generation or clearance of A
and PrPSc in a subgroup of sCJD patients.

Copyright © 2008 S. Karger AG, Basel


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Author Contacts

Markus Glatzel
Institute of Neuropathology, University Medical Center Hamburg-Eppendorf
Martinistrasse 52, DE-20246 Hamburg (Germany)
Tel. +49 40 42 803 2218, Fax +49 40 42 803 4929
E-Mail m.glatzel@uke.uni-hamburg.de

http://content.karger.com/produktedb/produkte.asp?typ=fulltext&file=000121389


Singeltary, Sr et al. JAMA.2001; 285: 733-734.


Diagnosis and Reporting of Creutzfeldt-Jakob Disease

Since this article does not have an abstract, we have provided the first 150
words of the full text and any section headings.


To the Editor:

In their Research Letter, Dr Gibbons and colleagues1 reported that the
annual US death rate due to Creutzfeldt-Jakob disease (CJD) has been stable
since 1985. These estimates, however, are based only on reported cases, and
do not include misdiagnosed or preclinical cases. It seems to me that
misdiagnosis alone would drastically change these figures. An unknown number
of persons with a diagnosis of Alzheimer disease in fact may have CJD,
although only a small number of these patients receive the postmortem
examination necessary to make this diagnosis. Furthermore, only a few states
have made CJD reportable. Human and animal transmissible spongiform
encephalopathies should be reportable nationwide and internationally.

Terry S. Singeltary, Sr
Bacliff, Tex

1. Gibbons RV, Holman RC, Belay ED, Schonberger LB. Creutzfeldt-Jakob
disease in the United States: 1979-1998. JAMA. 2000;284:2322-2323. FREE FULL
TEXT


http://jama.ama-assn.org/cgi/content/extract/285/6/733?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=singeltary&searchid=1&FIRSTINDEX=0&resourcetype=HWCIT


JOURNAL OF NEUROLOGY

MARCH 26, 2003

In light of the findings of Asante and Collinge et al, there

should be drastic measures to safeguard the medical and surgical arena

from sporadic CJDs and all human TSEs. I only ponder how many sporadic

CJDs in the USA are type 2 PrPSc?

http://www.neurology.org/cgi/eletters/60/2/176#535

Regarding Alzheimer's disease

(note the substantial increase on a yearly basis)

http://www.bseinquiry.gov.uk/files/yb/1988/07/08014001.pdf


snip...

The pathogenesis of these diseases was compared to Alzheimer's disease at a
molecular level...

snip...

http://www.bseinquiry.gov.uk/files/yb/1990/03/12003001.pdf


And NONE of this is relevant to BSE?

There is also the matter whether the spectrum of ''prion disease'' is wider
than that recognized at present.

http://www.bseinquiry.gov.uk/files/yb/1990/07/06005001.pdf


Human BSE

snip...

These are not relevant to any possible human hazard from BSE nor to the much
more common dementia, Alzheimers.

snip...

http://www.bseinquiry.gov.uk/files/yb/1990/07/09001001.pdf


IN STRICT CONFIDENCE

TRANSMISSION OF ALZHEIMER-TYPE PLAQUES TO PRIMATES


http://www.bseinquiry.gov.uk/files/yb/1993/01/05004001.pdf


Subject: Re: Hello Dr. Manuelidis
Date: Fri, 22 Dec 2000 17:47:09 -0500
From: laura manuelidis
Reply-To:laura.manuelidis@yale.edu
Organization: Yale Medical School
To: "Terry S.Singeltary Sr."

References: < manuelidis ="=" href="http://neurotalk.psychcentral.com/thread13175.html">http://neurotalk.psychcentral.com/thread13175.html


http://neurotalk.psychcentral.com/showthread.php?p=156015


More Evidence Mad Cow Same As CJD And Alzheimer's

1-24-3

To: Terry S. Singletary Sr
From Cindy B.
Date: Friday, Jan 24 2003

Subj: CJD $ Alzheimer's

Hi,

I read your article on CJD on www.rense.com and was wondering when they are going to alert the population of this and start testing all these animals that are being consumed by humans.

I have also read other articles that relate Alzheimer's, ALS, Parkinson's disease among others that have been linked to BSE/Mad Cow.

Assuming all this is true (which I have no doubt it is), wouldn't everyone have to get tested to see if they have contracted any of these or their variants?

I am really bothered by this whole thing and the lies that have been perpetuated by their many fronts in our government.

Also, when they talk about "downers", does that refer to sick animals? And that even these sick animals are given as feed to the other animals?

One last thing, I have information that an individual has "mad cow" who was in surgery here in our local hospital. The individual that told me says they are keeping it under tight wraps.

Thanks for your work and the very informative article,

Cindy Bouthillier Greeley, Colorado


Date: Fri, 24 Jan 2003
From: Terry S. Singeltary Sr.

Subject: Re: CJD $ Alzheimer's

Hello Cindy,

Thank you for your kind words. I have posted some data below on CJD and Alzheimer's that you may find interest in.

Yes, there are about 200,000 downers annually in the USA. This involves cattle that go down for one reason or another and that includes prion/CNS disorder cattle of all sorts and yes, you are feeding dead doggy and kitty cat (and the chemicals used to euthanize old pets, dead downer cattle, 'roadkill' which includes scrapie infected sheep and CWD/mad deer infected deer and elk. It's just and endless cycle of greed.

I would be interested to know more about the case of CJD and the hospital/surgical arena. This will be a major vector (of transmission) for prions.

OH...and don't start looking for rapid TSE/prion testing in sufficient numbers to find TSEs/mad cow in US cattle anytime soon, because if you don't look...you don't find. Thus, you keep the 'gold card' of 'BSE/TSE FREE' status in US cattle. Of course, we know different...

Kind regards, Terry


Regarding Alzheimer's disease

(note the substantial increase on a yearly basis)

http://www.bseinquiry.gov.uk/files/yb/1988/07/08014001.pdf


snip...

The pathogenesis of these diseases was compared to Alzheimer's disease at a molecular level...

snip...

http://www.bseinquiry.gov.uk/files/yb/1990/03/12003001.pdf

And NONE of this is relevant to BSE?

There is also the matter whether the spectrum of ''prion disease'' is wider than that recognized at present.

http://www.bseinquiry.gov.uk/files/yb/1990/07/06005001.pdf


Human BSE

snip...

These are not relevant to any possible human hazard from BSE nor to the much more common dementia, Alzheimers.

snip...

http://www.bseinquiry.gov.uk/files/yb/1990/07/09001001.pdf


=====================================================


From: TSS (216-119-130-123.ipset10.wt.net)

Subject: CJD or Alzheimer's, THE PA STUDY...

full text Date: May 7, 2001 at 10:24 am PST

Diagnosis of dementia: Clinicopathologic correlations

Francois Boller, MD, PhD; Oscar L. Lopez, MD; and John Moossy, MD

Article abstract--Based on 54 demented patients consecutively autopsied at the University of Pittsburgh, we studied the accuracy of clinicians in predicting the pathologic diagnosis. Thirty-nine patients (72.2%) had Alzheimer's disease, while 15 (27.7%) had other CNS diseases (four multi-infarct dementia; three Creutzfeldt-Jakob disease; two thalamic and subcortical gliosis; three Parkinson's disease; one progressive supranuclear palsy; one Huntington's disease; and one unclassified). Two neurologists independently reviewed the clinical records of each patient without knowledge of the patient's identity or clinical or pathologic diagnoses; each clinician reached a clinical diagnosis based on criteria derived from those of the NINCDS/ADRDA. In 34 (63 %) cases both clinicians were correct, in nine (17%) one was correct, and in 11 (20%) neither was correct. These results show that in patients with a clinical diagnosis of dementia, the etiology cannot be accurately predicted during life.

NEUROLOGY 1989;39:76-79

Several recent papers and reports have addressed the problem of improving the clinician's ability to diagnose dementia. Notable among those reports are the diagnostic criteria for dementia of the American Psychiatric Association, known as DSM III,1 as well as the clinical and neuropathologic criteria for the diagnosis of Alzheimer's disease (AD).2,3 Other researchers have published guidelines for the differentiation of various types of dementia4 and for antemortem predictions about the neuropathologic findings of demented patients.5

Most studies on the accuracy of clinical diagnosis in patients with dementia, especially AD, have used clinicopathologic correlation,6-15 and have found a percentage of accuracy ranging from 43% to 87%. Two recent reports, however,16,17 have claimed an accuracy of 100%. These two reports are based on relatively small series and have consisted of very highly selected patient samples. In our own recent experience, several cases of dementia have yielded unexpected neuropathologic findings,18 and we hypothesized that, in larger series, there would be a significant number of discrepancies between clinical diagnoses and autopsy findings. The present paper reviews the neuropathologic diagnosis of 54 demented patients who were autopsied consecutively at the University of Pittsburgh over a 7-year period, and reports the ability of clinicians to predict autopsy findings.

Material and methods. We independently reviewed the pathologic data and clinical records of 54 consecutive patients who had had an autopsy at the University of Pittsburgh (Presbyterian University Hospital [PUH] and the Pittsburgh (University Drive) Veterans Administration Medical Center [VAMC]), between 1980 and 1987.

The 54 cases included all those where dementia was diagnosed clinically but for which an obvious etiology, such as neoplasm, trauma, major vascular lesions, or clinically evident infection had not been found. The brains, evaluated by the Division of Neuropathology of the University of Pittsburgh, were obtained from patients cared for in different settings at their time of death.

On the basis of the amount of information available in each case, we divided the patients into three groups. Group 1 included 12 subjects who had been followed for a minimum of 1 year by the Alzheimer Disease Research Center (ADRC) of the University of Pittsburgh. ADRC evaluations include several visits and neurologic and neuropsychological testing as well as repeated laboratory tests, EEG, and CT.19,20

Group 2 included 28 patients who had been seen in the Neurology Service of PUH, of the VAMC, or in geriatric or psychiatric facilities of the University of Pittsburgh or at Western Psychiatric Institute and Clinic. All patients were personally evaluated by a neurologist and received a work-up to elucidate the etiology of their dementia.

Group 3 included 14 patients seen in other institutions; in most cases, they had also been seen by a neurologist and had had laboratory studies that included CT of the head. In three of the 14 cases, however, the information could be gathered only from the clinical summary found in the autopsy records.

Many of these subjects were referred for autopsy to the ADRC because of a public education campaign that encourages families to seek an autopsy for their relatives with dementia.

Pathologic data. All brains were removed by a neuropathologist as the first procedure of the autopsy at postmortem intervals of between 4 and 12 hours. The unfixed brain was weighed and the brainstem and cerebellum were separated by intercollicular section. The cerebral hemispheres were sectioned at 1-cm intervals and placed on a glass surface cooled by ice to prevent adhesion of the tissue to the cutting surface. The brainstem and cerebellum were sectioned in the transverse plane at 6-mm intervals. Brain sections were fixed in 10% buffered formalin. Selected tissue blocks for light microscopy were obtained from sections corresponding as exactly as possible to a set of predetermined areas used for processing brains for the ADRC protocol; additional details of the neuropathologic protocol have been previously published.18,21 Following standard tissue processing and paraffin embedding, 8-um-thick sections stained with hematoxylin and eosin and with the Bielschowsky ammoniacal silver nitrate impregnation were evaluted. Additional stains were used when indicated by the survey stains, including the Bielschowsky silver technique as previously reported.21

Clinical data. The medical history, as well as the results of examinations and laboratory tests, were obtained from the medical records libraries of the institutions where the patient had been followed and had died. We supplemented these data, when appropriate, with a personal or telephone interview with the relatives.

One neurologist (O.L.L.) recorded the information to be evaluated on two forms. The first form included sex, age, handedness, age at onset, age at death, course and duration of the disease, education, family history, EEG, CT, NMR, medical history, and physical examination as well as examination of blood and CSF for factors that could affect memory and other cognitive functions. The form also listed the results of neuropsychological assessment, and the characteristics and course of psychiatric and neurologic symptoms. The form provided details on the presence, nature, and course of cognitive deficits and neurologic signs. The second form was a 26-item checklist derived from the NINCDS-ADRDA Work Group Criteria for probable Alzheimer's disease.2 The forms did not include the patient's identity, the institution where they had been evaluated, the clinical diagnosis, or the pathologic findings.

Each form was reviewed independently by two other neurologists (F.B. and J.M.), who were asked to provide a clinical diagnosis. In cases of probable or possible AD, the two neurologists followed the diagnostic criteria of the NINCDS/ ADRDA work group.2

The results were tabulated on a summary sheet filled out after the two neurologists had provided their diagnosis on each case. The sheet included the diagnosis reached by the two neurologists and the diagnosis resulting from the autopsy.

Table 1. Pathologic diagnosis in 54 patients with dementia

N %

Alzheimer's disease alone 34 62.9

Alzheimer's disease and 2 3.7 Parkinsons's disease

Alzheimer's disease with 2 3.7 multi-infarct dementia

Alzheimer's disease with amyotrophic lateral sclerosis 39 72.2

Total Alzheimers disease 39 72.2

Multi-infarct dementia 4 7.4

Multi-infarct dementa 1 1.8 with Parkinson's disease

Parkinson's disease 2 3.7

Progressive subcortical gliosis 2 3.7

Creutzfeldt-Jakob disease 3 5.5

Progressive supranuclear palsy 1 1.8

Huntington's disease 1 1.8

Unclassified 1 1.8

Total other disease 15 27.7

Total all cases 54

Table 2. Clinical diagnosis

Clinical diagnosis Clinician #1 --- #2

Probable AD 29 21

Probable AD and MID 3 0

Probable AD and thyroid disease 1 2

Probable AD and PD 3 1

Probable AD and ALS 1 0

Probable AD and 0 1 olivopontocerebellar degeneration

Total probable AD 37 25 (68.5%) (46.2%)

Possible AD 3 2

Possible AD and MID 2 2

Possible AD and alcoholism 0 1

Possible AD and depression 1 0

Possible and thyroid disease 0 3

Possible AD and traumatic 1 2 encephalopathy

Possible AD and PD 3 6

Total Possible AD 10 16 (18.5%) (29.6%)

Atypical AD 0 1

Atuypical AD and MID 0 1

MID 2 4

MID and PD 3 0

Dementia syndrome of depression 0 1

HD 1 1

Wernicke-Korsakoff syndrome 1 0

Dementia of unknown etiology 0 5

Total 54 54

Results. The subjects included 26 women and 28 men who ranged in age from 30 to 91 years (mean, 72.2; SD, 10.7).

Autopsy findings. Table 1 shows that 39 (72.2%) of the 54 cases fulfilled histologic criteria for AD, with or without other histopathologic findings. The remaining 15 cases (27.7%) showed changes corresponding to other neurodegenerative disorders, cerebrovascular disease, or Creutzfeldt-Jakob disease (CJD). Seven cases met the histopathologic criteria for multi-infarct de-mentia (MID). Five cases (9.2%) showed changes associated with Parkinson's disease (PD).

Twenty-two of the 39 AD patients (56%) were age 65 or greater at the time of the onset of the disease. Seven of the 15 patients in the group with other diseases (47%) were age 65 or older at the time of disease onset.

Clinical diagnosis. There was a general adherence to the criteria specified by McKhann et al.2 However, the two clinicians in this study considered the diagnosis of probable AD when the probability of AD was strong even if a patient had another disease potentially associated with dementia that might or might not have made some contribution to the patient's clinical state (table 2).

Accuracy of the clinical diagnosis (table 3). Group 1 (N = 12). There were six men and six women. Ten cases (83.3%) met the histologic criteria for AD. In nine cases (75.0%), the diagnosis of both clinicians agreed with the pathologic findings; in the other case (8.3%), one clinical diagnosis agreed with the histologic findings. The remaining two cases (16.6%) had histopathologic diagnoses of CJD and progressive supranuclear palsy (PSP), respectively. Both cases were incorrectly diagnosed by both clinicians.

Group 2 (N = 28). There were 11 women and 17 men. Eighteen cases (64.2%) had the histopathologic features for AD with or without additional findings. Sixteen of these cases (57.1%) were correctly diagnosed by both clinicians, one case by one of them, and both incorrectly diagnosed one case. The remaining ten cases (35.7%) included two with CJD; two with subcortical gliosis (SG); two with PD, one of which was associated with MID; one case of Huntington's disease (HD); two cases with MID; and one unclassifed. Only one, the HD case (3.5%), was correctly diagnosed by both observers, and four cases (14.2%), two MID and two PD, one associated with MID, were correctly diagnosed by one clinician.

Group 3 (N = 14). In this group there were nine women and five men. Eleven cases (78.5%) met the histopathologic criteria for AD with or without additional findings. Eight of these cases (57.1%) were correctly diagnosed by both clinicians, two cases by one of them, while both were incorrect in one case. Of the remaining three cases (21.4%), only one was correctly diagnosed (7.1%) by one clinician. Both missed the two other cases of MID.

There was no statistically significant difference in diagnostic agreement across patient groups in which the amount of clinical information was different (X2 = 1.19; p > 0.05).

Table 3. Accuracy of the clinical diagnosis by two clinicians

Both One Neither Correct Correct Correct

Group 1 (N = 12) 9 1 2(16.6%)

Group 2 (N = 28) 17 5 6(21.4%)

Group 3 (N = 14) 8 3 3(21.4%)

Table 4. Previously reported studies of clinicopathologic correlation in demented patients*

Agreement %

Number of cases AD

Retrospective studies

Todorov et al, 1975(7) 776 43

Perl et al, 1984(9) 26 81

Wade et al, 1987(12) 65 85

Alafuzoff et al, 1987(13) 55 63

Kokmen at al, 1987(14) 32 72

Joachim et al, 1987(15) 150 87

Prospective studies

Sulkava et al, 1983(8) 27 82

Molsa et al, 1985(10) 58 71

Neary et al, 1986(11) 24 75

Martin et al, 1987(16) 11 100

Morris et al, 1987(17) 25 100

* Certain differences in methodology need clarification. Some authors7,8,10,11,12,13,16,17 tabulated patients with AD alone, and others9,14,15 included patients with AD plus other diseases, eg, Parkinson's disease and MID. We have combined AD alone and AD plus MID and other neurodegenerative diseases.

Discussion. Our results indicate that in a population of patients with dementias of varied etiology, the diagnosis could be correctly inferred by at least one of two clinicians in approximately 80% of cases. For one observer, the sensitivity of clinical diagnosis for AD was 85% and the specificity was 13%, and for the other, it was 95% and 33% respectively.

In the cases with a discrepancy between the clinical diagnosis and the neuropathologic findings, the great majority of patients had atypical clinical courses and findings. The three cases with autopsy findings of CJD had a much longer course than is usually seen with that condition and failed to show the usual EEG abnormalities. The patient with autopsy findings of PSP did not show the disorder in the extraocular movements usually associated with that condition. An atypical course was also present for two AD cases and two MID cases that did not have any feature suggestive of vascular disease. In one MID case, the CT did not show any focal lesions, while in the other it was not available. With regard to the two patients with SG, the pathologic diagnosis is so unusual and so infrequently recorded that clear clinical correlates are not evident.18 The third category of possible error is the patient listed as unclassified, for whom no specific neuropathologic diagnosis could be reached.22

The small number of neuropathologic diagnoses of Parkinson's disease reflects that, for the purpose of this series, the diagnosis of PD was made only when there were both a clear-cut clinical history and the neuropathologic findings characteristic of the disease, such as Lewy bodies, neuronal loss, globose neurofibrillary tangles, astrocytosis, and extraneuronal melanin pigment in substantia nigra and locus ceruleus.

Are these results derived from a sample of 54 patients representative of disease patterns in the community? Generally, the diagnosis of patients reported from major medical centers tend to be biased since the more complicated cases are referred there. In this study, however, this bias may be less important. Due to the major public education campaign about dementia and AD sponsored by the ADRC, there is a widespread awareness in Pittsburgh and in the surrounding regions of Western Pennsylvania of the value of an autopsy for a definitive diagnosis. Therefore, the great majority of cases were referred to us because the family wanted to know the precise etiology of a case of dementia.

The significant improvement in the clinical diagnosis of AD is a recent phenomenon. Due to the publicity and the advances in communication of scientific investigations, most physicians are more likely to consider AD as the main cause of dementia. The current risk of overdiagnosing AD reminds one of what occurred during the 1960s with the diagnosis of "atherosclerotic dementia."6 The high sensitivity and low specificity for AD shown in our study may reflect that possibility.

Because of the varying criteria for "other dementias" in many publications, we chose to analyze the accuracy of clinical diagnosis in terms of the diagnosis of AD alone or AD plus other neuropathologic findings. Several retrospective studies have attempted to point out reliable clinical and pathologic features for diagnosing the dementias, especially AD. The study of Tomlinson et al6 is not included in table 4 because there was no attempt to validate the clinical diagnosis with pathologic findings. The reports surveyed vary considerably in size and methodology. Sample size, for example, ranges from 26 subjects9 to 776 subjects.7 Some studies base the diagnosis on limited clinical information,7'9'14'15 others use widely accepted diagnostic criteria such as those specified in DSM III,13 and one group uses a standardized clinical assessment of patients enrolled in a longitudinal study.12 The reported accuracy of the clinical diagnosis of AD ranges from 43%7 to 87%.15

Recent prospective studies that adhere to strict clinical criteria,10'11'17 those in DSM III8 or those proposed by McKhann et al,16 indicate improved accuracy of clinical diagnosis of the most common causes of dementia, especially AD. In sample sizes ranging from 11 subjects16 to 58 subjects,l0 the accuracy of clinical diagnosis is reported as ranging from 71%10 to 100%16'17' Only two series, both based on small samples, report a 100% accuracy. We consider it unlikely that such accuracy could be confirmed in large series because of some inevitable imprecision in clinical diagnoses and the variability of clinical pictures. Furthermore, although researchers generally agree on the application of uniform criteria in clinical diagnosis of dementia, opinions still differ about specific diagnostic criteria, as well as about the pathologic characterization of dementia. Except for those small series, the results summarized in table 4(7-15) is are remarkably consistent with ours.

In table 3, although there was no statistical difference (p > 0.05) in diagnostic agreement across patient groups, there is a trend toward a lower percentage of diagnostic errors for the patients who had been followed most intensely (16% in group 1 compared with 21% in groups 2 and 3). The difference is not great, and it is, in fact, surprising to find out that in the patients about whom relatively little was known (group 3) the percentage of diagnostic error was the same as among patients seen by neurologists and for whom much more data were available (group 2). These paradoxical findings probably indicate that both clinicians learned to extract essential diagnostic criteria2 in spite of the variations in the amount of information available for consideration. It may well be that clinical, radiographic, and laboratory assessment of patients with dementia is burdened with information that is excessive and unessential for purely diagnostic purposes.

Acknowledgments

We thank Dr. A. Julio Martinez and Dr. Gutti Rao from the Division of Neuropathology for autopsy data. Mrs. Margaret Forbes, Ms. Annette Grechen, and Mrs. Paula Gent helped in the preparation of the manuscript.

References

1. American Psychiatric Association. Diagnostic and statistical manual of mental disorders. Organic Dementia Disorders, 3rd ed. Washington DC, APA, 1983:101-161.

2. McKhann G, Drachman D, Folstein M, Katzman R, Price D, Stadlan E. Clinical diagnosis of Alzheimer's disease: report of the NINCDS-ADRDA work group under the auspices of Department of Health and Human Services Task Force on Alzheimer's Dis-ease. Neurology 1984;34:939-944.

3. Khachaturian Z. Diagnosis of Alzheimer's disease. Arch Neurol 1985;42:1097-1105.

4. Cummings J, Benson F. Dementia: a clinical approach, 1st ed. Boston: Butterworths, 1983.

5. Rosen WG, Terry R, Fuld P, Katzman R, Peck A. Pathological verification of ischemic score in differentiation of dementias. Ann Neurol 1980;7:486-488.

6. Tomlinson BE, Blessed G, Roth M. Observations on the brains of demented old people. J Neurol Sci 1970;11.205-242.

7. Todorov A, Go R, Constantinidis J, Elston R. Specificity of the clinical diagnosis of dementia. J Neurol Sci 1975;26:81-98.

8. Sulkava R, Haltia M, Paetau A, Wikstrom J, Palo J. Accuracy of clinical diagnosis in primary degenerative dementia: correlation with neuropathological findings. J Neurol Neurosurg Psychiatry 1983;46:9-13.

9. Perl D, Pendlebury W, Bird E. Detailed neuropathologic evalua-tion of banked brain specimens submitted with clinical diagnosis of Alzheimer's disease. In: Wirtman R, Corkin S, Growdon J, eds. Alzheimer's disease: advances in basic research and therapies. Proceedings of the Fourth Meeting of International Study Group on the Treatment of Memory Disorders Associated with Aging. Zurich, January 1984. Cambridge, MA: CBSM, 1984:463. Molsa PK, Paljarvi L, Rinne JO, Rinne UK, Sako E. Validity of clinical diagnosis in dementia: a prospective clinicopathological study. J Neurol Neurosurg Psychiatry 1985;48:1085-1090.

11. Neary D, Snowden JS, Bowen D, et al. Neuropsychological syn-dromes in presenile dementia due to cerebral atrophy. J Neurol Neurosurg Psychiatry 1986;49:163-174.

12. Wade J, Mirsen T, Hachinski V, Fismm~ M, Lau C, Merskey H. The clinical diagnosis of Alzheimer disease. Arch Neurol 1987;44:24-29.

13. Alafuzoff I, Igbal K, Friden H, Adolfsson R, Winblad B. Histopathological criteria for progressive dementia disorders: clinicalpathological correlation and classification by multivariate data analysis. Acta Neuropathol (Berl) 1987,74:209-225.

14. Kokmen E, Offord K, Okazaki H. A clinical and autopsy study of dementia in Olmsted County, Minnesota, 1980-1981. Neurology 1987;37:426-430.

15. Joachim CL, Morris JH, Selkoe D. Clinically diagnosed Alzheimer's disease: autopsy neuropathological results in 150 cases. Ann Neurol 1988;24:50-56.

16. Martin EM, Wilson RS, Penn RD, Fox JH, Clasen RA, Savoy SM. Cortical biopsy results in Alzheimer's disease: correlation with cognitive deficits. Neurology 1987;37:1201-1204.

17. Morris JC, Berg L, Fulling K, Torack RM, McKeel DW. Validation of clinical diagnostic criteria in senile dementia of the Alzheimer type. Ann Neurol 1987;22:122.

18. Moossy J, Martinaz J, Hanin I, Rao G, Yonas H, Boiler F. Thalamic and subcortical gliosis with dementia. Arch Neurol 1987;44:510-513.

19. Huff J, Becker J, Belle S, Nebes R, Holland A, Boller F. Cognitive deficits and clinical diagnosis of Alzheimer's disease. Neurology 1987;37:1119-1124.

20. Huff J, Boiler F, Lucchelli F, Querriera R, Beyer J, Belle S. The neurological examination in patients with probable Alzheimer's disease. Arch Neurol 1987;44:929-932.

21. Moossy J, Zubenko G, Martinez AJ, Rao G. Bilateral symmetry of morphologic lesions in Alzheimer's disease. Arch Neurol 1988;45:251-254.

22. Heilig CW, Knopman DS, Mastri AR, Frey W II. Dementia without Alzheimer pathology. Neurology 1985;35:762-765.

From the Departments of Neurology (Drs. Boller, Lopez, and Moossy), Psychiatry (Dr. Boller), Pittsburgh (University Drive) Veterans Administration Medical Center (Dr. Boller), Department of Pathology (Division of Neuropathology) (Dr. Moossy), and the Pittsburgh Alzheimer Disease Research Center (Drs. Boller, Lopez, and Moossy), University of Pittsburgh Medical School, Pittsburgh, PA.

Supported in part by NIH Grants nos. AG05133 and AG03705, NIMH Grant no. MH30915, by funds from the Veterans Admin., and by the Pathology Education and Research Foundation (PERF) of the Department of Pathology, University of Pittsburgh.

Presented in part at the fortieth annual meeting of the American Academy of Neurology, Cincinnati. OH, April 1988.

Received April 7, 1988. Accepted for publication in final form July 20, 1988.

Address correspondence and reprint requests to Dr. Boller, Department of Neurology, 322 Scaife Hall, University of Pittsburgh Medical School, Pittsburgh, PA 15261.

January 1989 NEUROLOGY 39 79

TSS

From: TSS (216-119-130-151.ipset10.wt.net)

Subject: Evaluation of Cerebral Biopsies for the Diagnosis of Dementia

Date: May 8, 2001 at 6:27 pm PST


Subject: Evaluation of Cerebral Biopsies for the Diagnosis of Dementia Date: Tue, 8 May 2001 21:09:43 -0700 From: "Terry S. Singeltary Sr." Reply-To: Bovine Spongiform Encephalopathy To: BSE-L@uni-karlsruhe.de


######### Bovine Spongiform Encephalopathy #########

Evaluation of Cerebral Biopsies for the Diagnosis of Dementia

Christine M. Hulette, MD; Nancy L. Earl, Md; Barbara J. Crain, MD, Phd

· To identify those patients most likely to benefit from a cerebral biopsy to diagnose dementia, we reviewed a series of 14 unselected biopsies performed during a 9-year period (1980 through 1989) at Duke University Medical Center, Durham, NC. Pathognomonic features allowed a definitive diagnosis in seven specimens. Nondiagnostic abnormalities but not diagnostic neuropathologic changes were seen in five additional specimens, and two specimens were normal. Creutzfeldt-Jakob disease was the most frequent diagnosis. One patient each was diagnosed as having Alzheimer's disease, diffuse Lewy body disease, adult-onset Niemann-Pick disease, and anaplastic astrocytoma. We conclude that a substantial proportion of patients presenting clinically with atypical dementia are likely to receive a definitive diagnosis from a cerebral biopsy. However, in those with coexisting hemiparesis, chorea, athetosis, or lower motor neuron signs, cerebral biopsies are less likely to be diagnostic. (Arch Neurol. 1992;49:28-31)

"Dementia" is a syndrome characterized by global deterioration of cognitive abilities and is the general term used to describe the symptom complex of intellectual deterioration in the adult. It is associated with multiple causes, although Alzheimer's disease (AD) alone accounts for approximately 60% of cases.1-3

Interest in the accuracy of the diagnosis of dementia is a relatively recent phenomenon, reflecting both an increase in physicians' awareness of multiple specific causes of dementia and a marked increase in both the incidence and prevalence of dementia associated with the increase in the elderly population.4' The clinical evaluation remains the key to the differential diagnosis, and in most cases dementia can be diagnosed accurately by clinical criteria. However, the definitive diagnoses of AD.1'5'7 Pick's disease,8'10 Creutzfeldt-Jakob disease (CJD),11-16 Binswanger's disease,17'18' and diffuse Lewy body disease19-22 still require histologic examination of the cortex to identify characteristic structural changes.

Brain tissue is almost invariably obtained at autopsy, and the vast majority of pathologic diagnoses are thus made post mortem. Alternatively, an antemortem histologic diagnosis can be provided to the patient and his or her family if a cerebral biopsy is performed while the patient is still alive. Because brain biopsies for dementia are not routinely performed, we sought to define the spectrum of pathologic changes seen in a retrospective unselected series of adult patients undergoing cerebral biopsy for the diagnosis of atypical dementing illnesses and to determine the patient selection criteria most likely to result in a definitive diagnosis.

MATERIALS AND METHODS

Cerebral biopsies performed solely for the diagnosis of dementia in adult patients were identified by a manual search of the patient files of the Division of Neuropathology, Duke University Medical Center Durham, NC, and by a computerized search of discharge diagnoses of patients undergoing brain biopsies. Fourteen cases were identified from the period 1980 to 1989. Patients undergoing biopsies for suspected tumor, inflammation, or demyelinating disease were excluded. A clinical history of dementia was an absolute requirement for inclusion in the study. Diagnosis was based on Dignostic and Statistical Manual of Mental Disorders, Third Edition, and on National Institute of Neurological and Communicative Disorders and Stroke/Alzheimer's Disease and Related Disorders Association (ADRDA) criteria for probable AD.23

The published recommendations for handling tissue from patients with suspected CJD were followed in every case.24-26 Briefly, tissue was transported in double containers clearly marked "Infectious Disease Precations." Double gloves, aprons, and goggles were used at all times. Tissue was fixed in saturated phenol in 3.7% phosphate-buffered formaldehyde for 48 hours25 and subsequently hand processed for paraffin embedding. At least 1 cm(to 3 power) of tissue was available for examination from each patient, except for patient 7, who underwent bilateral temporal lobe needle biopsies. Patient 14 underwent biopsy of both frontal and temporal lobes.

One paraffin block was prepared for each biopsy specimen, and sections were routinely stained with hematoxylin-eosin, luxol fast blue, Congo red, alcian blue, periodic acidSchiff, and modified King's silver stain27 in every ease, except for case 7, in which the diagnosis was made by frozen section. Portions of both gray and white matter were primarily fixed in glutaraldehyde and embedded in epoxy resin (Epon). Tissue was examined by electron microscopy if abnormalities, such as neuronal storage or other inclusions, were seen in routine paraffin sections.

Khachaturian's5 National Institute of Neurological and Communicative Disorderers and Stroke/ADRDA criteria for quantitation of senile plaques and the diagnosis of AD were used in all cases after 1985. At the time of our, study, these criteria were also applied retrospectively to cases accessioned before 1985. No attempt was made to grade the severity of other abnormalities (eg, gliosis and spongiform change), and the original pathologic diagnoses were not revised.

RESULTS

The clinical presentations, biopsy findings, and follow-up data, including postoperative complications, are summarized in Table 1 for all 14 patients. Their biopsy findings are summarized in Table 2.

The ages of this unselected group of 14 patients who underwent cerebral biopsies for dementia ranged from 32 to 78 years (mean, 51.6 years). There were seven men and seven women. Duration of symptoms ranged from 1 month to 6 years (mean, 2.3 years). No differences were noted between the group with diagnostic biopsies (cases 1 through 7) and the group with nondiagnostic biopsies (cases 8 through 14) with regard to age at the time of biopsy or duration of symptoms. However, five of seven patients in the nondiagnostic group had hemiparesis, chorea, athetosis, or lower motor neuron signs. None of these findings was present in the patients with diagnostic biopsies. Visual disturbances, abnormal eye movements, and ataxia were present in four of seven cases with diagnostic biopsies but were absent in the group with nondiagnostic biopsies.

In this series of 14 patients, two experienced postoperative complications, one of which was severe. Patient 2 developed an intraparenchymal parietal cortex hemorrhage and was mute after biopsy. Patient 9 developed a subdural hygroma that was treated uneventfully.

Eight patients died 1 month to 9 years after biopsy. An autopsy was performed in five of these eight patients. One of these patients (patient 4) had a firm diagnosis of presenile AD on biopsy, which was confirmed at autopsy. Patient 3 had a biopsy diagnosis of CJD, which was also confirmed at autopsy. Two patients with only white-matter gliosis diagnosed at biopsy had autopsy diagnoses of amyotrophic lateral sclerosis with dementia (patient 8) and CJD (patient 9). One patient in whom a biopsy specimen appeared to be normal had Huntington disease identified at autopsy (patient 14). At the time of this writing, four patients are still alive, two are in clinically stable condition 1 to 2 years after biopsy, and two are severely demented 2 to 3 years after biopsy. Two patients (one with a definite and one with a possible diagnosis of CJD) have been unavailable for follow-up.

COMMENT Our study of patients presenting with atypical dementia reaffirms the diagnostic utility of cerebral biopsy. In selected cases, cerebral biopsy results in a high yield of definitive diagnostic information. A wide variety of disorders may be encountered, including CJD, AD, diffuse Lewy body disease, and storage disorders, such as Niemann-Pick disease.28-30 The diagnosis of Niemann-Pick disease type C was confirmed by assay of cholesterol esterification in cultured fibroblasts31'32' with markedly abnormal results in one patient, who was described in detail elsewhere.33

One example of an unsuspected anaplastic astrocytoma (case 7) was also encountered. This case was unusual in light of currently used sensitive imaging techniques. This patient may have been suffering from gliomatosis cerebri.

Table 1.--Summary of Clinical Presentation and Course*

Case/Age,y/Sex

Duration of Symptoms, y

Clincial Findings

Biopsy

Follow-up ==========

1/60/F

0.1

Dementia, left-sided homonymous hemianopia, myoclonus, EEG showing bilateral synchronous discharges

CJD

Unavailable ==========

2/57/M

0.4

Dementia, aphasia, myoclonus; visual disturbance; facial asymmetry, abnormal EEG

CJD

Postoperative intraparenchymal hemorrhage, mute dead at 58 y, no autopsy ==========

3/59/M

2

Dementia, apraxia, visual disturbance, bradykinesia, EEG showing periodic sharp waves

CJD

Dead at 61 y, autopsy showed CJD =========

4/32/M

1

Dementia, myclonus, ataxia, family history of early-onset dementia

AD

Dead at 40 y, autopsy showed AD =========

5/78/M

6

Dementia, paranoia, agitation, rigidity

Diffuse Lewy body disease

Dead at 78 y, no autopsy =========

6/37/F

6

Dementia, dysarthria, abnormal eye movements, ataxia

Neuronal storage disorder, adultonset N-P type II

Stable at 39 y =========

7/58/F

0.3

Dementia, amnesia, depression, partial complex seizures

Anaplastic astrocytoma

Dead at 58 y, no autopsy ==========

8/37/M

2

Dementia, dysarthria, upper-extremity atrophy and fasciculations

Gliosis

Dead at 38 y, auotpsy showed amyotrophic lateral sclerosis with white-matter gliosis =========

9/45/F

2

Dementia, aphasia, right-sided hemiparesis, rigidity, athetosis

Gliosis

Postoperative subdural hygroma, dead at 50 y, autopsy showed focal CJD =========

10/56/F

2

Dementia, myoclonus, cerebellar dysaarthria, EEG showing biphasic periodic sharp waves

Consistent with CJD

Unavailable ==========

11/60/F

2

Dementia, dysarthria, right-sided hemiparesis, hypertension, magnetic resonance image showing small vessel disease

Plaques, gliosis

stable at 61 y =========

12/52/F

2

Dementia, aphasia, right-sided hemiparesis

Gliosis

Bedridden, severely demented at 54 y =========

13/40/M

0.5

Dementia, mild bifacial weakness, concrete thinking, altered speech

Normal

Stable at 41 y =========

14/52/M

6

Dementia, choreoathetosis, family history of senile dementia, computed tomographic scan showing normal caudate

Normal

Dead at 61y, autopsy showed Huntington's disease, grade II/IV ========== * EEG indicates electroencephalogram; CJD, Creutzfeldt-Jakob disease; AD, Alzheimer's disease; and N-P, Niemann-Pick disease.

Table 2.--Pathologic Findings at Biopsy *

Case Site of Biopsy Type of Biopsy Tissue Examined Spongiform Change Neuritic Plaques per X 10 Field Tangles White Matter Gliosis Other

1 R temporal Open 1 cm3 + 0 0 0 0 =====

2 L temporal Open 1 cm3 + 0 0 0 0 =====

3 R temporal Open 1 cm3 + 0 0 0 0 =====

4 R frontal Open 1 cm3 0 >100 + + Amyloid angiopathy =====

5 R temporal Open 1 cm3 0 9 0 0 Lewy bodies =====

6 R temporal Open 1 cm3 0 0 0 0 Neuronal storage =====

7 R temporal/L temporal Needle/needle 1 X 0.3 X 0.3 cm / 1 X 0.3 X 0.1 cm 0/0 0/0 0/0 +/0 0/anaplastic astrocytoma =====

8 R frontal Open 1 cm3 o o o + 0 =====

9 L parietal Open 1 cm3 0 0 ± + 0 =====

10 R temporal Open 1 cm3 ± 0 0 0 0 =====

11 L temporal Open 1 cm3 0 23 0 + 0 =====

12 L temporal Open 1 cm3 0 0 0 + 0 =====

13 r frontal Open 1 cm3 0 0 0 0 0 =====

14 L temporal/L frontal Open/open 1 cm3/ 1 cm3 0/0 0/0 0/0 0/0 0/0 ===== * Plus sign indicates present; zero, absent; and plus/minus sign, questionably present

Positron emission tomography showed multiple areas of increased uptake, even though the magnetic resonance image was nondiagnostic and showed only subtle increased signal intensity on review. Bilateral temporal lobe needle biopsies yielded abnormal findings. Biopsy of the right side showed only reactive gliosis, which may have been adjacent to tumor. Biopsy of the left side, performed 3 days later, was diagnostic for anaplastic astrocytoma. Unfortunately, permission for an autopsy was refused, and complete evaluation of the underlying pathologic process thus must remain speculative.

The high incidence of definite and probable CJD in our series indicates that it is imperative that appropriate precautions are taken to prevent the transmission 0f disease to health care workers when biopsy tissue from patients with dementia is handled.24-26

At our institution, cerebral biopsy for the diagnosis of dementia is reserved for patients with an unusual clinical course or symptoms that cannot be diagnosed with sufficient certainty by other means. In most instances, cerebral biopsy is unnecessary and is clearly not a procedure to be proposed for routine diagnostic evaluation. In all cases, extensive clinical, metabolic, neuropsychological and radiologic evaluations must be performed before cerebral biopsy is considered. In addition, preoperative consultations among neurologists, neurosurgeons, neuroradiologists, and neuropathologists are necessary to ascertain the optimal biopsy site given the clinical data to ensure that maximal infornmtion is derived from the biopsy tissue.

An optimal biopsy specimen is one that is taken from an affected area, handled to eliminate artifact, and large enough to include both gray and white matter.34 Open biopsy is generally preferred because it is performed under direct visualization and does not distort the architecture of the cerebral cortex. This method also provides sufficient tissue (approximately 1 cm3) to perform the required histologic procedures.

Some physicians question the utility of diagnostic cerebral biopsies in dementia, stating that the procedure is unlikely to help the patient. While it is frequently true that the diagnoses made are untreatable with currently available therapeutic modalities, this is by no means universally true. Kaufman and Catalano35 noted that cerebral biopsy has revealed specific treatable illnesses, such as meningoencephalitis and multiple sclerosis. Our patient with anaplastic astrocytoma (patient 7) underwent radiation therapy, although she quickly died of her disease. Furthermore, when a definitive diagnosis can be made, even of incurable illnesses, such as CJD and AD, it is often possible to give an informed prognosis to the family and to help them plan for the future.

The formulation of indications, for diagnostic cerebral biopsy raises difficult and complex issues. In 1986, Blemond36 addressed the clinical indications and the legal and moral aspects of cerebral biopsy, and his recommendations remain valid today: (1)The patient has a chronic progressixe cerehral disorder with documented dementia. (2) All other possible diagnostic methods have already been tried and have failed to provide sufficient diagnostic certainty. (3) The general condition of the patient permits cerebral biopsy. (4) Several specialists are in agreement regarding the indication. (5) Informed consent is obtained from relatives. (6) Modern diagnostic tools, such as immunocytochemistry and electron microscopy, are used to the fullest capacity in the examination of the material obtained.

As with any intracranial surgical procedure involving the cerebral cortex, the risks of cerebral biopsy include anesthetic complications, hemorrhage, infections, and seizures. Guthkelch37 stated that the mortality associated with brain biopsy is not greater than that associated with general anesthesia. Cerebral biopsy, however can result in substantial morbidity. In our series, two of 14 patients suffered operative complications, intraparenchymal hemorrhage in one patient (patient 2) resulted in aphasia, while another patient (patient 10) developed a subdural hygroma, which was successfully treated, and recovered her baseline status.

The current diagnostic accuracy of cerebral biopsy in the evaluation of dementia is unknown. Most of the larger general series 34'38-41 were reported before computed tomography was available and included many pediatric cases presenting with genetic neurodegenerative disorders that are now more readily diagnosed by other means. For adults with dementia, less information is available. Katzman et al4 recently reviewed the literature concerning the diagnostic accuracy of cerebral biopsy for dementia and concluded that 75% of these procedures result in diagnostic material. Patient selection is very important, and the literature is heavily weighted toward patients with a clinical diagnosis of AD.35'42-44 Our study thus provides documentation of the diagnostic accuracy of cerebral biopsies in unselected patients with atypical dementia.

Autopsy follow-up is imperative in any dementia program,2 as a definitive diagnosis will not be made in a substantial proportion of patients. In our series, three patients died without a diagnosis, and autopsy was performed in all three. The diagnostic features were not present in the cortical area in which the biopsy was performed. In case 8, examination of the spinal cord revealed amyotrophic lateral sclerosis. Diffuse gliosis of the white matter was noted, which was the pathologic basis of the patient's dementia. In case 9. the spongiform change of CJD was focal, according to the pathologist's report; unfortunately, the tissue was not available for our review. In case 14, the diagnosis of Huntington's disease grade II/IV was made after close examination of the caudate nucleus. As one might predict, fewer autopsies were performed in the group with diagnostic biopsies; only two of five deaths in this category were followed by postmortem examinations. The diagnosis of AD was confirmed in case 4. In ease 3, the biopsy diagnosis of CJD was confirmed.

In summary, a series of 14 unselected cerebral biopsies performed for the diagnosis of atypical dementia was reviewed to define the spectrum of pathologic changes seen and to estimate the likelihood of obtaining diagnostic tissue. Histologic diagnoses of CJD, AD, diffuse Lewy body disease, Niemann-Pick disease type C, or anaplastic astrocytoma were made in seven patients. The high incidence of CJD in this population (four of 14 cases) emphasizes the need to use appropriate precautions when tissue from patients with unusual dementing illnesses is handled. Consultation among neurologist, neurosurgeons, neuroradiologists, and neuropathologists is essential to select appropriate patients and to choose the proper biopsy site. Demented patients with coexisting hemiparesis, chorea, athetosis, or lower motor neuron signs are unlikely to benefit from cortical biopsy.

This investigation was supported by Clinical Investigator Award PHS AG-00446 from the National Institute on Aging (Dr. Hulette) and by grant PHS SP50AG05128-03 from the Joseph and Kathleen Bryan Alzheimer's Disease Research Center (Drs Earl and Crain). Dr Hulette is a College of American Pathologists Foundation Scholar, Northfield, Ill.

The Authors thank Ms Bonnie Lynch and Ian Sutherland, PhD, for thier assistance.

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Clinico-Pathological Correlation in Dementias

F. TeixeiraI, E. Alonso2, V. Romerol, A. Ortiz', C. Martinez3, E. Otero4
'Departnents of Experimental Neuropathology and 2Genetics, and the 3Division
of Psychology and
4Neurology, National Institute of Neurology and Neurosurgery, Mexico City,
Mexico

Submitted: February 22, 1994
Accepted: February 9, 1995

The object of this study is to investigate whether or not there are clinical signs and symptoms in patients with dementia that, by themselves or jointly, can be associated with the pathological diagnosis of Alzheimer's disease. Twelve patients with dementia were studied, in whom the clinical diagnosis of Alzheimer's disease was made according to established criteria. A sample of leptomeninges, cortex and subcortical white matter was obtained from each patient and was processed for light and electron microscopy. In the cases in whom neuritic plaques and neurofibrilary
tangles were present, pathological changes were quantified. The diagnosis of Alzheimer's disease was confirmed in 5 cases, whereas in 3 patients spongiform encephalopathy was present. In the remaining patients, the number of neuritic plaques was within normal limits for the age of the subjects. Comparison of the data in Alzheimer (n = 5) and non-Alzheimer (n =7) groups showed an increased, statistically significant incidence of acalculia, abnormalities of judgment, impairment of abstraction and primitive reflexes in the former. Although good fitting models were obtained, none achieved perfect discrimination. The model that included alterations of judgment and acalculia gave the best fit.

Key Words: Alzheimer's disease, dementia

INTRODUCTION

snip...

The sample in this study may be considered small for the purpose of selecting a set of signs and symptoms that can characterize Alzheimer's disease clinically. However, it is not an easy task to obtain the permission to perform a brain biopsy which is of no benefit for the patient when the relative is informed of the risks involved.
The definite diagnosis of Alzheimer's disease depends on the microscopical examination of brain tissue, either by autopsy or biopsy. In the USA, the Alzheimer Disease Research Center of the University of Pittsburgh has launched a public campaign to encourage relatives of demented patients to request a postmortem examination of the brain (Boller et al 1989). However, in Mexico, a similar campaign has enjoyed little success so far for several reasons. The patient who suffers from Alzheimer's disease usually dies at home. The relatives, who are already exhausted by the demands of caretaking, obtain a death certificate from the family physician, and proceed quickly to the funeral rites. The few families who do request an autopsy are almost invariably denied admission to the hospital where the patient
had been admitted because cadavers without a death certificate must be sent to the police department for autopsy. Many patients die in small towns or villages where there are no pathologists, let alone neuropathologists. Therefore, brain
biopsy remains the only possibility for confirming the clinical diagnosis. It is true that there is no benefit derived by the patient from this procedure and that he or she faces surgical and anesthetic risks. In contrast, brain biopsy allows: 1. the
development of new diagnostic procedures that might, in the future, replace it; 2. adequate genetic counselling in cases with an autosomal dominant pattern of inheritance, so that family members can take part in studies at the molecular
biology level; and 3. the performance of therapeutic trials and of epidemiological surveys in Mexico.

Familiar aggregation has been demonstrated in 40% of cases of Alzheimer's disease. In 15% of these cases, the pattern of inheritance was autosomal dominant (Heston et al 1981). Patient number nine's family is an example of the latter, and showed an early age of onset. Vacuolar change, similar to that present in Jakob- Creutzfeldt disease, has been described in brains of patients with Alzheimer's disease, especially at the medial temporal isocortex, where it has a high, statistically significant association with the presence of large numbers of neurofibrillary
tangles and argyrophilic plaques (Smith et al 1987). This study considered the possibility that cases 5 to 7, diagnosed as Jakob-Creutzfeldt disease, could be, in fact, Alzheimer cases with this peculiar vacuolar change. A good method for
separating the two entities would be the use of antibodies against prion (Pr-P) proteins (Tateishi et al 1988), which were, unfortunately, not available to the authors. However, none of these cases showed positivity for A4 protein, neither
had one single argyrophilic plaque or tangle. Moreover, the biopsies were taken from the frontal regions, which are reported to be free of involvement in instances of Alzheimer's disease with vacuolar changes (Smith et al 1987).

Although the diagnosis of probable Alzheimer's disease was made in all of the patients in this study, according to the criteria established by McKhann et al (1984), this diagnosis was confirmed in only 47.1% of them. This low rate might
be the result of several factors. The National Institute of Neurology and Neurosurgery in Mexico City is an institution that concentrates especially on difficult or unusual cases that are referred from all over the country. Therefore, it received a biased sample that included as many as 3 cases of spongiform encephalopathy. In addition, it is important to remember that a small, 1 cubic centimeter sample of cortex and white matter may not be representative of the extent of the damage in other areas of the brain, and so, correlates poorly with the clinical picture. This illustration is particularly true of cases 1 to 4, which did not fit into any of the pathological entities that manifest clinically as dementia. To understand more clearly the relation between damage and clinical impairment, further prospective studies using autopsy material are needed.

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Clinico-pathologic studies in dementia: nondemented
subjects with pathologically confirmed Alzheimer's
disease. Neurology 38: 1682-1687.
De la Monte SM. 1989. Quantitation of cerebral atrophy in
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Neurol 25:450-459.
Heston LL, Mastri AR, Andersen E, White V. 1981. Dementia
of the Alzheimer type. Arch Gen Psychiat 38:1085-
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Joachim CL, Morris JH, Selkoe DJ. 1988. Clinically diagnosed
Alzheimer's disease: autopsy results in 150 cases.
Ann Neurol 24:50-56.
Karp HR, Mirra SS. 1986. Dementia in adults. In: Joynt RJ,
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pp 1-74.
Khachaturian ZS. 1985. Diagnosis of Alzheimer's disease.
Arch Neurol 42:1097-1104.
McKhann G, Drachman D, Folstein M, Katzman R, Price D,
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Validity of clinical diagnosis in dementia: a prospective
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Vacuolar change in Alzheimer's disease. Arch Neurol
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Neurol Neurosurg Psychiatry 46:9-13.
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Gerstmann Straussler-Scheinker disease: immunohistological
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Todorov A, Go R, Constantinidis J, Eiston R. 1975. Specificity
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disease. Arch Neurol 44:24-29.tss


ONE IN A MILLION, OR EVERY 72 SECONDS $$$


Subject: Every 72 seconds someone in America develops Alzheimer’s
Date: March 20, 2007 at 5:35 pm PST

Alzheimer’s Disease Prevalence Rates Rise to More than Five Million in the United States Someone develops Alzheimer’s every 72 seconds, according to new Alzheimer’s Association report

The Alzheimer’s Association today reports that in 2007 there are now more than 5 million people in the United States living with Alzheimer’s disease. This number includes 4.9 million people over the age of 65 and between 200,000 and 500,000 people under age 65 with early onset Alzheimer’s disease and other dementias. This is a 10 percent increase from the previous prevalence nationwide estimate of 4.5 million.

The greatest risk factor for Alzheimer’s is increasing age, and with 78 million baby boomers beginning to turn 60 last year, it is estimated that someone in America develops Alzheimer’s every 72 seconds; by mid-century someone will develop Alzheimer’s every 33 seconds.

These new estimates, as well as other data concerning the disease and its effects, are issued today as hundreds of advocates from across the country gather in the nation’s capitol for the Alzheimer’s Association’s annual Public Policy Forum. The report titled, 2007 Alzheimer’s Disease Facts and Figures, is being released at a hearing today chaired by Senator Barbara Mikulski. Senators Barbara Mikulski and Christopher Bond and Representatives Edward Markey and Christopher Smith have introduced bipartisan legislation to address problems identified in the Association’s report. The Association’s report details the escalation of Alzheimer’s disease which now is the seventh leading cause of death in the country and the fifth leading cause of death for those over age 65. It also offers numerous statistics that convey the burden that Alzheimer’s imposes on individuals, families, state and federal governments, businesses, and the nation’s health care system. For example:

Without a cure or effective treatments to delay the onset or progression of the Alzheimer’s, the prevalence could soar to 7.7 million people with the disease by 2030, which is more than the population of 140 of the 236 United Nations countries.
By mid-century, the number of people with Alzheimer’s is expected to grow to as many as 16 million, more than the current total population of New York City, Los Angeles, Chicago and Houston combined.
As the prevalence impact of Alzheimer’s grows, so does the cost to the nation. The direct and indirect costs of Alzheimer’s and other dementias amount to more than $148 billion annually, which is more than the annual sales of any retailer in the world excluding Wal-Mart.
“Alzheimer’s Disease Facts and Figures clearly shows the tremendous impact this disease is having on the nation; and with the projected growth of the disease, the collective impact on individuals, families, Medicare, Medicaid, and businesses will be even greater,” says Harry Johns, President and CEO of the Alzheimer’s Association. “However there is hope. There are currently nine drugs in Phase III clinical trials for Alzheimer’s several of which show great promise to slow or stop the progression of the disease. This, combined with advancements in diagnostic tools, has the potential to change the landscape of Alzheimer’s.”

According to the latest statistics from the Centers for Disease Control and Prevention, from 2000-2004 death rates have declined for most major diseases -- heart disease (-8 percent), breast cancer (-2.6 percent), prostate cancer (-6.3 percent) and stroke (-10.4 percent), while Alzheimer’s disease deaths continue to trend upward, increasing 33 percent during that period.

“We must make the fight against Alzheimer’s a national priority before it’s too late. The absence of effective disease modifying drugs, coupled with an aging population, makes Alzheimer’s the health care crisis of the 21st century,” Johns said.

Medicare currently spends nearly three times as much for people with Alzheimer’s and other dementias than for the average Medicare beneficiary. Medicare costs are projected to double from $91 billion in 2005 to more than $189 billion by 2015, more than the current gross national product of 86 percent of the world’s countries. In 2005, state and federal Medicaid spending for nursing home and home care for people with Alzheimer’s and other dementias was estimated at $21 billion; that number is projected to increase to $27 billion by 2015.

The new report also highlights the impact that Alzheimer’s has on states with more than 6 in 10 (62%) having double digit growth in prevalence by the end of the decade. In addition, Alaska (+47%), Colorado (+47%), Utah (+45%), Wyoming (+43%), Nevada (+38%), Idaho (+37%), Oregon (+33%), and Washington (+33%) will experience increases ranging from one-third to one-half. The states with the largest numbers of deaths due to Alzheimer’s disease in 2003 were (1) California, (2) Florida, (3) Texas, (4) Pennsylvania, and (5) Ohio.

The Alzheimer’s Association is the first and largest voluntary health organization dedicated to finding prevention methods, treatments and an eventual cure for Alzheimer’s. For more than 25 years, the Association has provided reliable information and care consultation; created services for families; increased funding for dementia research; and influenced public policy changes.

Contact: Call our media line at 312.335.4078

Download Report: 2007 Alzheimer’s Disease Facts and Figures (28 pages)

Quote Sheet (2 pages)

http://www.alz.org/national/documents/PR_FFquotesheet.pdf


Fact sheet (2 pages)


http://www.alz.org/national/documents/PR_FFfactsheet.pdf

http://www.alz.org/news_and_events_rates_rise.asp


Every 72 seconds someone in America develops Alzheimer’s.


http://www.alz.org/national/documents/Report_2007FactsAndFigures.pdf


Alzheimer-type neuropathology 28 year old patient with idCJD

Sun Feb 19, 2006 11:14

71.248.144.164


SHORT REPORT

Alzheimer-type neuropathology in a 28 year old patient with iatrogenic Creutzfeldt-Jakob disease after dural grafting
M Preusser1, T Ströbel1, E Gelpi1,2, M Eiler3, G Broessner4, E Schmutzhard4 and H Budka1,2
1 Institute of Neurology, Medical University Vienna, Austria
2 Austrian Reference Centre for Human Prion Diseases (OERPE), General Hospital Vienna, Austria
3 Department of Neurology, LKH Rankweil, Austria
4 Department of Neurology, Medical University Innsbruck, Innsbruck, Austria


Correspondence to:
Dr H Budka
Institute of Neurology, Medical University of Vienna, Waehringer Guertel 18-20, 4J, 1097 Vienna, Austria; herbert.budka@kin.at


ABSTRACT

We report the case of a 28 year old man who had received a cadaverous dura mater graft after a traumatic open skull fracture with tearing of the dura at the age of 5 years. A clinical suspicion of Creutzfeldt-Jakob disease (CJD) was confirmed by a brain biopsy 5 months prior to death and by autopsy, thus warranting the diagnosis of iatrogenic CJD (iCJD) according to WHO criteria. Immunohistochemistry showed widespread cortical depositions of disease associated prion protein (PrPsc) in a synaptic pattern, and western blot analysis identified PrPsc of type 2A according to Parchi et al. Surprisingly, we found Alzheimer-type senile plaques and cerebral amyloid angiopathy in widespread areas of the brain. Plaque-type and vascular amyloid was immunohistochemically identified as deposits of beta-A4 peptide. CERAD criteria for diagnosis of definite Alzheimer’s disease (AD) were met in the absence of neurofibrillar tangles or alpha-synuclein immunoreactive inclusions. There was no family history of AD, CJD, or any other neurological disease, and genetic analysis showed no disease specific mutations of the prion protein, presenilin 1 and 2, or amyloid precursor protein genes. This case represents (a) the iCJD case with the longest incubation time after dural grafting reported so far, (b) the youngest documented patient with concomitant CJD and Alzheimer-type neuropathology to date, (c) the first description of Alzheimer-type changes in iCJD, and (d) the second case of iCJD in Austria. Despite the young patient age, the Alzheimer-type changes may be an incidental finding, possibly related to the childhood trauma.


--------------------------------------------------------------------------------

http://jnnp.bmjjournals.com/


CJD1/9 0185


Ref: 1M51A

IN STRICT CONFIDENCE


Dr McGovern From: Dr A Wight

Date: 5 January 1993

Copies: Dr Metters

Dr Skinner

Dr Pickles

Dr Morris

Mr Murray


TRANSMISSION OF ALZHEIMER-TYPE PLAQUES TO PRIMATES


1. CMO will wish to be aware that a meeting was held at DH yesterday,
4 January, to discuss the above findings. It was chaired by Professor
Murray (Chairman of the MRC Co-ordinating Committee on Research in
the Spongiform Encephalopathies in Man), and attended by relevant
experts in the fields of Neurology, Neuropathology, molecular biology,
amyloid biochemistry, and the spongiform encephalopathies, and by
representatives of the MRC and AFRC.

2. Briefly, the meeting agreed that:

i) Dr Ridley et als findings of experimental induction of p amyloid
in primates were valid, interesting and a significant advance in the
understanding of neurodegeneradve disorders;

ii) there were no immediate implications for the public health, and no
further safeguards were thought to be necessary at present; and

iii) additional research was desirable, both epidemiological and at the
molecular level. Possible avenues are being followed up by DH
and the MRC, but the details will require further discussion.

93/01.05/4.1tss


http://www.bseinquiry.gov.uk/files/yb/1993/01/05004001.pdf

BSE101/1 0136


IN CONFIDENCE

5 NOV 1992

CMO From: Dr J S Metters DCMO 4 November 1992


TRANSMISSION OF ALZHEIMER TYPE PLAQUES TO PRIMATES


1. Thank you for showing me Diana Dunstan's letter. I am glad that MRC have
recognised the public sensitivity of these findings and intend to report them in their
proper context. This hopefully will avoid misunderstanding and possible distortion by
the media to portray the results as having more greater significance than the findings
so far justify.


2. Using a highly unusual route of transmission (intra-cerebral injection) the
researchers have demonstrated the transmission of a pathological process from two
cases one of severe Alzheimer's disease the other of Gerstmann-Straussler disease to
marmosets. However they have not demonstrated the transmission of either clinical
condition as the "animals were behaving normally when killed'. As the report
emphasises the unanswered question is whether the disease condition would
have revealed itself if the marmosets had lived longer. They are planning funher
research to sec if the conditions, as opposed to the partial pathological process, is
transmissible.


What are the implications for public health?


3. . The route of transmission is very specific and in the natural state of things
highly unusual. However it could be argued that the results reveal a potential risk,
in that brain tissue from these two patients has been shown to transmit a pathological
process. Should therefore brain tissue from such cases be regarded as potentially
infective? Pathologists, morticians, neuro surgeons and those assisting at neuro
surgical procedures and others coming into contact with "raw" human brain
tissue could in theory be at risk. However, on a priori grounds given the highly
specific route of transmission in these experiments that risk must be negligible if
the usual precautions for handling brain tissue are observed.


92/11.4/1-1


BSE101/1 0137


4. The other dimension to consider is the public reaction. To some extent the GSS
case demonstrates little more than the transmission of BSE to a pig by intra-cerebral
injection. If other prion diseases can be transmitted in this way it is little surprise that
some pathological findings observed m GSS were also transmissible to a marmoset.
But the transmission of features of Alzheimer's pathology is a different matter, given
the much greater frequency of this disease and raises the unanswered question whether
some cases are the result of a transmissible prion. The only tenable public line will
be that "more research is required" before that hypothesis could be evaluated. The
possibility on a transmissible prion remains open. In the meantime MRC needs
carefully to consider the range and sequence of studies needed to follow through from
the preliminary observations in these two cases. Not a particularly comfortable
message, but until we know more about the causation of Alzheimer's disease
the total reassurance is not practical.


JS METTERS
Room 509
Richmond House
Pager No: 081-884 3344
Callsign: DOH 832

121/YdeStss

92/11.4/1.2

http://www.bseinquiry.gov.uk/files/yb/1992/11/04001001.pdf


also, see the increase of Alzheimer's from 1981 to 1986


http://www.bseinquiry.gov.uk/files/yb/1988/07/08014001.pdf


Regarding Alzheimer's disease

(note the substantial increase on a yearly basistss)

http://www.bseinquiry.gov.uk/files/yb/1988/07/08014001.pdf


snip...


The pathogenesis of these diseases was compared to Alzheimer's disease at a
molecular level...


snip...


http://www.bseinquiry.gov.uk/files/yb/1990/03/12003001.pdf


And NONE of this is relevant to BSE?

There is also the matter whether the spectrum of ''prion disease'' is wider
than that recognized at present.


http://www.bseinquiry.gov.uk/files/yb/1990/07/06005001.pdf


Human BSE

snip...

These are not relevant to any possible human hazard from BSE nor to the much
more common dementia, Alzheimers.

snip...


http://www.bseinquiry.gov.uk/files/yb/1990/07/09001001.pdf


From: terry <[log in to unmask]>
Subject: Re: FELINE ALZHEIMER'S OR MAD CAT DISEASE I.E. FSE ???
In-Reply-To: <[log in to unmask]>


I have 2 questions for you, terry singeltary. Do you agree with colm kelleher where he states there may be a relationship between vCJD and alzeheimer's in that alzheimers may be misdiagnosed. And is it true that BSE cannot be destroyed by heat or chemical so that any instrument that touches it must be thrown out.
Sent wirelessly via BlackBerry from T-Mobile.

http://lists.ifas.ufl.edu/cgi-bin/wa.exe?A2=ind0612&L=sanet-mg&T=0&P=8525


Sender: Sustainable Agriculture Network Discussion Group

From: "Terry S. Singeltary Sr." <[log in to unmask]>
Subject: Re: FELINE ALZHEIMER'S OR MAD CAT DISEASE I.E. FSE ???
Comments: To: [log in to unmask]

i have written about this many times and spoke with colm on several
occasions when he was writing his book.....


> Do you agree with colm kelleher where he states there may be a relationship

> between vCJD and alzeheimer's in that alzheimers may be misdiagnosed


NOT JUST vCJD but all human TSE, especially sporadic CJD, there are studies
showing ''CJD'' as being misdiagnosed as Alzheimer's (see below).

AND personally i think there is a potential that Alzheimers may be low
level TSE. may be something else too, i mean, just what is Alzheimer's???

IN CONFIDENCE

TRANSMISSION OF ALZHEIMER-TYPE PLAQUES TO PRIMATES

H F BAKER, R M RIDLEY, L W DUCHEN, T J CROW, C J BRUTON


As part of a larger series of experiments designed to assess the
transmissibility of various neurodegenerative disease including the
spongiform encephalopathies (eg Creutzfeldt-Jakob disease and BSE we
injected several marmosets (Callithrix Jacchus) intracerebrally with brain
homogenate from :

1) a 56 year old patient with severe Alzheimer's disease - B - amyloid
plaques and conogophilic angiopathy (CAA) and neurofibrillary tangles; and

2) a 62 year old patient with Gerstmann-Straussler disease, a spongiform
encephalopathy with PrP Plaques and, in this case, B-amyloid plaques and
CAA.

These monkeys were killed more than 6 years after inoculation and their
brains were found to contain moderate numbers of B-amyloid plaques and CAA
but NO neurofibrillary tangles NO PrP. The brains of more than 12 monkeys
killed at an older age did not contain these changes. B-amyloid was not
found in the brains of monkeys injected with brain material which did not
contain B-amyloid. These results suggest that B-amyloidosis is a
transmissible process resembling the transmissibility of PrP amyloidosis in
transmissible dementia and strengthens the parallels between Alzheimer's
disease and Creutzfeldt-Jakob disease.

It should be stressed, however, that we are not claiming to have transmitted
Alzheimer's disease because

1) the animals were behaving normally when killed and

2) no neurofibrillary tangles were seen.

We have argued previously that transmission of spongiform encephalopathy,
particularly from the genetic cases (GSS and some CJD), does not imply that
the donor cases themselves acquired the disease by infection. We would apply
the same arguments in this case, particularly in view of the genetic basis
of some cases of Alzheimer's disease and the extensive epidemiological data
which does not link Alzheimer's disease to infection.


DISCLOSURE


This work is currently under preparation for publication BUT IN VIEW OF
PUBLIC CONCERN OVER THE TRANSMISSIBLE SPONGIFORM ENCEPHALOPATHIES (eg BSE) AND THE HIGH INCIDENCE OF ALZHEIMER'S DISEASE IN THE GENERAL POPULATION, IT IS IMPORTANT THAT THESE FINDINGS ARE NOT DISCUSSED OPENLY BEFORE FULL PUBLICATION.

Furthermore, BEFORE DISCLOSURE, IT IS IMPORTANT THAT INTERESTED PARTIES BE
PROPERLY APPRAISED OF THE DATA AND THERE IMPLICATIONS.

Previous attempts to transmit Alzheimer's disease to rodents and large
primates have been unsuccessful. It is our belief that post-mortem tissue
from these animals still exists and we are anxious that research workers (in
the USA) SHOULD NOT RE-EXAMINE this material until our data are published.


SAFETY

At this point we would like to stress again the lack of evidence relating
Alzheimer's disease to exposure to brain tissue through neurosurgery or
occupation. NEVERTHELESS it is appropriate that proper bodies should
consider whether the results of our experiments have any implications for
human health.


FURTHER EXPERIMENTS

The interpretation we have made that B-amyloidosis as a self-peretuating
process has important implications for understanding the process of
neurodegeneration, which are best studied at the level of protein chemistry.
However, we can see arguments for some transmission experiments including:

1) serial passage of B-amyloidosis in order to strengthen the evidence of
transmissibility;

2) transmission from other cases of Alzheimer's disease in order to
establish the generality of this effect;

3) transmission to primates which are allowed to run their full course, ie
to see whether the full syndrome of Alzheimer's disease develops including
neurofibrillary tangle formation, astrocytosis, neuronal loss and
concomitant cognitive decline. (We are already expert in the
neuropsychological assessment of marmosets). It should be remembered that,
at the present time, only the amyloidosis have been found to be
transmissible such that Alzheimer's disease PER SE has not been transmitted;

4) comparison of transmission from cases which contain only CAA and those
which contain only B-amyloid plaques. These two forms of amyloid differ very
slightly and it is not known whether this difference is preserved on
transmission;

5) establishment of the time course of the development of B-amyloidosis. The
present experiment suggests that the time course is somewhere between 1-5
years;

6) transmission using larger quantities of purified preparations of
B-amyloid. This may reduce the transmission time considerably;

7) transmission using animals of different initial ages to investigate the
relationship between transmission time and chronological age, eg
transmission into mature animals may decrease transmission time through an
interaction between the pathological process and senescence;

8) manipulation of transmission time by treatments which may speed up plaque
formation, eg by increasing the production of amyloid precursor protein, or
which may slow down plaque formation and protect from disease progression.

The proposal is to inoculate about 25 marmosets in the first instance and to
replace them in a 'rolling' experiment as they die or are killed according
to the experimental design. The marmosets will be kept in the MRC Marmoset
Colony in Cambridge. Additional facilities and personnel are not required
over and above that awarded to Dr. Ridley in an MRC Programma Grant.

A preliminary report of our findings will be presented by Professor L W
Duchan at the January 1993 meeting of the British Neuropathological Society.

http://www.bseinquiry.gov.uk/


Published online before print June 15, 2007
Proc. Natl. Acad. Sci. USA, 10.1073/pnas.0609621104

Neuroscience

Cellular prion protein regulates -secretase cleavage of the Alzheimer's amyloid precursor protein

( lipid raft proteolysis scrapie glycosaminoglycan )

Edward T. Parkin *, Nicole T. Watt *, Ishrut Hussain , Elizabeth A. Eckman ¶, Christopher B. Eckman ¶, Jean C. Manson , Herbert N. Baybutt , Anthony J. Turner *, and Nigel M. Hooper ***
*Proteolysis Research Group, Institute of Molecular and Cellular Biology, Faculty of Biological Sciences, and Leeds Institute of Genetics, Health and Therapeutics, University of Leeds, Leeds LS2 9JT, United Kingdom; Neurodegeneration Research, Neurology and Gastrointestinal Centre of Excellence for Drug Discovery, GlaxoSmithKline Research and Development Limited, Third Avenue, Harlow, Essex CM19 5AW, United Kingdom; ¶Mayo Clinic, Jacksonville, FL 32224; and Roslin Institute, Neuropathogenesis Unit, Edinburgh EH9 3JF, United Kingdom

Edited by Stanley B. Prusiner, University of California, San Francisco, CA, and approved May 10, 2007 (received for review October 30, 2006)

Proteolytic processing of the amyloid precursor protein (APP) by -secretase, -site APP cleaving enzyme (BACE1), is the initial step in the production of the amyloid (A) peptide, which is involved in the pathogenesis of Alzheimer's disease. The normal cellular function of the prion protein (PrPC), the causative agent of the transmissible spongiform encephalopathies such as Creutzfeldt-Jakob disease in humans, remains enigmatic. Because both APP and PrPC are subject to proteolytic processing by the same zinc metalloproteases, we tested the involvement of PrPC in the proteolytic processing of APP. Cellular overexpression of PrPC inhibited the -secretase cleavage of APP and reduced A formation. Conversely, depletion of PrPC in mouse N2a cells by siRNA led to an increase in A peptides secreted into the medium. In the brains of PrP knockout mice and in the brains from two strains of scrapie-infected mice, A levels were significantly increased. Two mutants of PrP, PG14 and A116V, that are associated with familial human prion diseases failed to inhibit the -secretase cleavage of APP. Using constructs of PrP, we show that this regulatory effect of PrPC on the -secretase cleavage of APP required the localization of PrPC to cholesterol-rich lipid rafts and was mediated by the N-terminal polybasic region of PrPC via interaction with glycosaminoglycans. In conclusion, this is a mechanism by which the cellular production of the neurotoxic A is regulated by PrPC and may have implications for both Alzheimer's and prion diseases.


--------------------------------------------------------------------------------

Author contributions: E.T.P., J.C.M., and N.M.H. designed research; E.T.P., N.T.W., I.H., E.A.E., C.B.E., and H.N.B. performed research; E.T.P., N.T.W., E.A.E., C.B.E., and N.M.H. analyzed data; I.H., E.A.E., and C.B.E. contributed new reagents/analytic tools; and E.T.P., J.C.M., A.J.T., and N.M.H. wrote the paper.

The authors declare no conflict of interest.

Present address: Department of Biological Sciences, Lancaster University, Lancaster LA1 4YQ, United Kingdom.

**To whom correspondence should be addressed.

Nigel M. Hooper, E-mail: n.m.hooper@leeds.ac.uk

www.pnas.org/cgi/doi/10.1073/pnas.0609621104


http://www.pnas.org/cgi/content/abstract/0609621104v1?etoc


Subject: Inactivation of amyloid-enhancing factor (AEF): study on
experimental murine AA amyloidosis

Date: June 24, 2007 at 1:11 pm PST

Masatoshi Omoto · Tadaaki Yokota · Dan Cui
Yoshinobu Hoshii · Hiroo Kawano · Toshikazu Gondo
Tokuhiro Ishihara · Takashi Kanda

Inactivation of amyloid-enhancing factor (AEF): study on experimental
murine AA amyloidosis

Abstract It is known that amyloid-enhancing factor (AEF)
shortens the preamyloid phase in experimentally induced
AA amyloidosis in mice. Because it is reported that AEF
serves as both a nidus and a template for amyloid formation,
AA amyloidosis may have transmissibility by a prionlike
mechanism. It has been shown that amyloid fi brils also
have AEF activity, and amyloid fi brils with AEF activity
were named fi bril-amyloid enhancing factor (F-AEF). In
this study, we investigated methods to inactivate the AEF
activity. AEF was extracted from the thyroid gland obtained
at autopsy of a patient with AA amyloidosis. Before
injection into mice, AEF was treated with several methods
for inactivation. Of all the tested treatments, 1 N NaOH,
0.1 N NaOH, and autoclaving consistently demonstrated
complete inactivation of AEF. Heat treatment led to incomplete
inactivation, but 0.01 N NaOH, 0.001 N NaOH,
pepsin, trypsin, pronase, and proteinase K treatment had
no effect on AEF activity. By analysis with transmission
electron microscopy, the AEF preparation contains amyloid
fi brils, and a change of ultrastructure was shown after
1 N NaOH, 0.1 N NaOH, and autoclaving treatment. Furthermore,
immunoblotting of AEF with antihuman AA
antibody revealed that the protein band was scarcely found
after autoclaving, 1 N NaOH, and 0.1 N NaOH treatment.
Our results suggest that, similar to Creutzfeldt–Jakob
M. Omoto (*) · T. Kanda
Department of Neurology and Clinical Neuroscience, Yamaguchi
University School of Medicine, 1-1-1 Minamikogushi, Ube City,
Yamaguchi 755-8505, Japan
Tel. +81-836-22-2719; Fax +81-836-22-2364
e-mail: omoto-path@umin.ac.jp
T. Yokota
Department of Pathology, Kokura Memorial Hospital, Yamaguchi,
Japan
D. Cui · Y. Hoshii · H. Kawano · T. Ishihara
Department of Radiopathological and Science, Yamaguchi
University School of Medicine, Fukuoka, Japan
T. Gondo
Department of Surgical Pathology, Yamaguchi University Hospital,
Yamaguchi, Japan
disease (CJD), amyloidosis may require chemical or autoclaving
decontamination.
Key words Amyloid-enhancing factor · Amyloidosis ·
Creutzfeldt–Jakob disease · Prion · Transmission electron


snip...


Discussion

Secondary amyloidosis occurs in individuals with longstanding
infl ammatory diseases. Since the incidence of
chronic infl ammatory diseases such as tuberculosis and leprosy
has decreased in recent years, rheumatoid arthritis
(RA) is now the most common disease involving secondary
AA amyloidosis, especially in elderly patients with a long
history of RA. Autopsy studies indicate that the incidence
of secondary amyloidosis in RA patients may be between
20% and 25%.21 Generally, treating the underlying disease
is the conventional approach in AA amyloidosis, because
no specifi c treatment exists. It is not yet certain whether
preventing amyloid proteins from aggregating will be therapeutically
beneficial.
An essential factor for the development of AA amyloidosis
is a continual high plasma concentration of SAA.
However, it is still unclear why only a subset of such individuals
develops AA amyloidosis. Therefore, in addition to
high concentrations of an amyloidogenic protein, other
factors are thought to be necessary in the pathogenesis of
AA amyloidosis. AEF is thought to be one of the essential
factors for the development of amyloidosis, although the
mechanism responsible for the formation of amyloid fi brils
is still unclear. Many studies have identifi ed that AEF activity
is a large macromolecular complex, and all tissue extracts
studied to date appear to contain glycoprotein with
an approximate size of 10–15 kD.4,22–24
Most strains of mice are susceptible to developing AA
amyloid deposition following chronic administration of
infl ammatory stimuli such as casein or azocasein.25 The
prolonged preamyloid phase in experimentally induced AA
amyloidosis can be dramatically shortened by intravenous
or intraperitoneal administration of AEF with the infl am-
matory stimuli.2–4 All mice that were exposed to AEF and
injected with silver nitrate developed amyloidosis by day
7.16 Amyloid fi brils extracted from different types of amyloidosis
from a wide variety of species display biologically
similar AEF activity to that in experimental animals. In fact,
Niewold et al.26 showed that intravenous and intraperitoneal
injection of hamster AA amyloid fi brils, bovine AA
amyloid fi brils, and human light chain-derived (A?) amyloid
fi brils markedly accelerated hamster amyloidosis.
The AEF activity found in the amyloid fi bril preparation
was named F-AEF.6 Furthermore, intravenous injection
of amyloid-like fi brils made from synthetic peptides of
transthyretin27 or denatured silk28 accelerates murine AA
amyloidosis. By double immunogold labeling and microautoradiographic
methods, Johan et al. reported that intravenously
administered, radiolabeled, heterologous,
amyloid-like, synthetic fi brils reached the lung and spleen,
accelerated amyloidosis, and were associated with topographical
deposition of murine protein AA fi brils in the recipient
mouse.29
Drastic structural changes of amyloid protein from the
normal and soluble forms to the unique ß-sheet fi brils may
be the most important event in amyloidosis. Recently, it was
reported that AEF serves as both a nidus and a template
for amyloid formation,8 and AA amyloidosis may show
transmissibility as a prion-like mechanism.9 Johan et al. also
suggested that amyloid-like synthetic fi brils had a nidus activity,
29 and amyloid-enhancing activity may occur through
the mechanism of amyloid-like fi brils serving as seed for
fi bril formation. Moreover, by using the method of negative
staining with TEM, electron micrographs of amyloid fi brils
were observed under some conditions. O’Nuallain et al.
revealed that electron micrographs of islet amyloid polypeptide
showed aggregates initially and then grew into fi bril
formations after incubation.30 In contrast, Santhoshkumar
et al. revealed that, using TEM, amyloid ß-peptide showed
signifi cantly decreased fi bril formation and some amorphous
aggregates after incubation with aA-crystallin in
their in vitro study.31 They suggested that aA-crystallin had
the ability to inhibit amyloid fi bril formation. Similarly, in
our study, electron micrographs of F-AEF revealed some
amorphous aggregates after autoclaving, 1 N NaOH, and
0.1 N NaOH treatment and short and transformed fi brils
after heat treatment. Furthermore, immunoblotting of AEF
with antihuman AA antibody revealed that a protein band
was scarcely found after autoclaving, 1 N NaOH, and 0.1 N
NaOH treatments and that weak protein bands were found
after heat treatment. We suggested that these results indicated
the activity of F-AEF disappeared after autoclaving,
1 N NaOH, and 0.1 N NaOH treatments and that the activity
of F-AEF was decreased after heat treatment.
Prion diseases are associated with the accumulation of a
conformational isomer (PrPSc) of host-derived prion protein
(PrPC), and PrPSc forms amyloid fi brils. The exogenous abnormal
form of the prion protein is generally regarded as a
seed that promotes the association of cellular proteins.
Prions are very resistant to inactivation, and accidental
transmission has occurred through the use of inadequate
decontamination procedures.

In our experiments with mice, the activity of F-AEF was
markedly decreased after autoclaving treatment under conditions
of 132°C for 1 h and 1 N NaOH and 0.1 N NaOH
treatment for 1 h. For CJD materials, the Committee on
Health Care Issues of the American Neurological Association
recommended treatment with 1 N NaOH as a standard
sterilization procedure.18 Heat treatment led to substantial
but incomplete inactivation in this study. The Committee
on Health Care Issues of the American Neurological Association
reported that boiling was an ineffective procedure
for CJD tissues and contaminated materials.18 Tateishi et al.
showed that heat treatment with SDS was effective.17
The acceleration of amyloid deposition may be a primary
event in disease, CJD, bovine spongiform encephalopathy
(BSE), familial amyloid polyneuropathy, and AA and
human senile systemic amyloidosis.32 Walker et al. reported
Aß amyloid extracted from an Alzheimer disease brain may
have potential of prion protein.33

The property described for F-AEF is similar to that
of prion reported in CJD. Chemical or autoclaving decontamination
for CJD is necessary for most items associated
with surgery or autopsy.34 We suggest that amyloidosis may
need chemical or autoclaving decontamination similar to
CJD.

Acknowledgments We thank Mr. Jitsuo Kash!tani for excellent technical
assistance. This work was supported by a grant from the Intractable
Disease Division, the Ministry of Health and Welfare, a Research
Committee for Epochal Diagnosis and Treatment of amyloidosis in
Japan, and a Research Committee for amyloidosis.


http://www.springerlink.com/content/j6257362375470q8/fulltext.pdf


Unexpectedly high incidence of visceral AA-amyloidosis in slaughtered cattle in Japan
Unexpectedly high incidence of visceral AA-amyloidosis in slaughtered cattle
in Japan

Authors: Kana Tojo a; Takahiko Tokuda a; Yoshinobu Hoshii b; Xiaoying Fu
c; Keiichi Higuchi c; Takane Matsui d; Fuyuki Kametani e; Dr Shu-Ichi
Ikeda a Affiliations: a Third Department of Medicine, Shinshu University School
of Medicine. Matsumoto. Japan
b First Department of Pathology, Yamaguchi University School of Medicine.
Ube. Japan
c Department of Aging Biology, Institute on Aging and Adaptation, Shinshu
University, Graduate School of Medicine. Matsumoto. Japan
d Department of Pathobiological Science, School of Veterinary Medicine,
Obihiro University of Agriculture and Veterinary Medicine. Obihiro. Japan
e Department of Molecular Biology, Tokyo Institute of Psychiatry. Tokyo.
Japan

DOI: 10.1080/13506120500107097
Publication Frequency: 4 issues per year
Published in: Amyloid, Volume 12, Issue 2 June 2005 , pages 103 - 108
Subjects: Biochemistry; Medicine;
Number of References: 30
Formats available: HTML (English) : PDF (English)
Previously published as: Amyloid: International Journal of Experimental &
Clinical Investigation (1350-6129) until 2004
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register and/or sign in to identify your country.
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Abstract

Experimental mouse AA amyloidosis can be transmissible by dietary ingestion
of amyloid fibrils and it is well known that AA amyloidosis occasionally
develops in aged cattle. Bovine liver and intestine have conventionally been
used in Oriental foods, and the incidence of visceral AA amyloidosis in
slaughtered cattle was evaluated. Renal tissues from 302 aged cattle older
than 4 years were obtained from a local abattoir. Amyloid deposition was
microscopically examined and amyloid protein was immunochemically
determined. Renal amyloid deposition was seen in 15 out of 302 cattle with
no previous history of diseas, an incidence of 5.0%. Amyloid protein in
these cattle was AA and they had pathological findings in their visceral
organs on gross examination. The incidence of visceral AA amyloidosis in
slaughtered cattle in this study was disturbingly high compared with those
(0.4-2.7%) previously reported from Japan and other foreign countries. AA
amyloidosis is a life-threatening complication in patients with chronic
inflammatory diseases and these patients at risk should avoid ingesting food
that may possibly contain AA amyloid fibrils. More detailed information on
cattle amyloidosis is required to guarantee the safety of our food.

Keywords: Cattle amyloidosis; transmissible amyloidosis; reactive
amyloidosis; AA amyloidosis; chronic inflammation
view references (30)

http://www.informaworld.com/smpp/content~content=a713998551~db=all~order=page


Subject: Amyloidogenic potential of foie gras
Date: June 22, 2007 at 2:23 pm PST


http://lists.ifas.ufl.edu/cgi-bin/wa.exe?A2=ind0706&L=sanet-mg&P=9621


A case of sCJD with beta-amyloid deposits and alpha-synuclein inclusions

Abstract

Case Report

A sporadic case of Creutzfeldt–Jakob disease with beta-amyloid deposits and alpha-synuclein inclusions

Anne Vital,11Neuropathology Department, Victor Segalen – Bordeaux 2 University, Bordeaux,Anne Vital, MD, PhD, Laboratoire de Neuropathologie BP 42, Université Victor Segalen, Bordeaux 2, 146, rue Léo-Saignat, 33076 Bordeaux Cedex, France. Email: anne.vital@chu-bordeaux.fr Marie-Hélène Canron,11Neuropathology Department, Victor Segalen – Bordeaux 2 University, Bordeaux, Roger Gil,22Neurology Department, Poitiers University, Poitiers and Jean-Jacques Hauw33Neuropathology Department, Pitié-Salpêtrière Hospital, Paris, France and Claude Vital11Neuropathology Department, Victor Segalen – Bordeaux 2 University, Bordeaux, 1Neuropathology Department, Victor Segalen – Bordeaux 2 University, Bordeaux, 2Neurology Department, Poitiers University, Poitiers and 3Neuropathology Department, Pitié-Salpêtrière Hospital, Paris, France
Anne Vital, MD, PhD, Laboratoire de Neuropathologie BP 42, Université Victor Segalen, Bordeaux 2, 146, rue Léo-Saignat, 33076 Bordeaux Cedex, France. Email: anne.vital@chu-bordeaux.fr

Abstract

Neurodegenerative disorders are characterized by the correlation of clinical symptoms and neuropathological changes in the brain. However, overlaps between distinct entities are becoming more and more evident. We report the coexistence of Alzheimer pathology and alpha-synuclein inclusions in a sporadic, methionine/valine type 1, Creutzfeldt–Jakob disease (CJD) case. There were neurofibrillary changes in the neocortex and beta amyloid cerebral angiopathy was marked. Several Lewy bodies were present in the substantia nigra, locus ceruleus and the dorsal motor nucleus of the vagus, and alpha-synuclein cytoplasmic inclusions were also found in cortical neurons. These findings raise the debated relationship between Parkinson’s disease with dementia, dementia with Lewy bodies and a Lewy body variant of Alzheimer disease. Among the factors that may have contributed to this considerable morphological overlap are the patient’s age (79 years at autopsy) and the over 2-year duration of the disease. As the average disease duration in sporadic methionine/valine type 1 CJD is less than 6 months, it seems legitimate to speculate that the initial symptoms resulted from Alzheimer and alpha-synuclein related pathologies. This observation shows that CJD can be present in elderly patients who are suspected of having other neurodegenerative diseases, which could underline the importance of neuropathology-based surveillance systems.


http://www.blackwell-synergy.com/doi/abs/10.1111/j.1440-1789.2007.00755.x


P01.34

Pathological Interaction Between Protein Misfolding Disorders: Prions and
Alzheimer's Disease

Morales, R; Estrada, L; Castilla, J; Soto, C
University of Texas Medical Branch, Neurology, USA

Protein Misfolding Disorders (PMD) include several diverse diseases, such Alzheimer's,
Parkinson's, Transmissible Spongiform Encephalopathies, Diabetes Type II and various
systemic amyloidosis. The central event in these diseases is the accumulation of a
misfolded, ß-sheet rich aggregated form of a naturally expressed protein. In vitro
studies have shown that protein misfolding and aggregation follows a seedingnucleation
mechanism similar to the process of crystallization. In this model, the
limiting step is the formation of small oligomeric intermediates that act as seeds to
catalyze the polymerization process. The seeding-nucleation model provides a
rationale and plausible explanation for the infectious nature of prions. Infectivity lies on
the capacity of preformed stable misfolded oligomeric proteins to act as a seed to
catalyze the misfolding and aggregation process. The mechanism of misfolding
and aggregation is similar in all PMD suggesting that misfolded aggregates have
an inherent capability to be transmissible. Moreover, it has been shown that
oligomeric seeds formed by one protein can accelerate the misfolding and aggregation of
another protein, by a process termed cross-seeding. Our current study aims to assess
the potential molecular cross-talk among PMD in vivo. For this purpose we inoculated with
prions a transgenic mice model of Alzheimer's disease (tg2576) that develops typical
amyloid plaques over time. 45, 303 and 365 days old transgenic and wild type mice
were inoculated intraperitoneally with RML prions. We found significant diminution in
prion incubation periods for tg2576 mice compared to age matched wild type controls.
Moreover, a time dependent effect was observed, where the shorter incubation period
was observed in animals containing larger number of amyloid plaques. Inoculation of
tg2576-RML prions into wild type mice showed incubation periods similar to the
original infectious material, suggesting that strains characteristics are maintained. In
vitro data showed cross-seeding aggregation between PrPSc and Aß. Our findings
suggest an interaction between Alzheimer's and prion pathologies, indicating
that one protein misfolding process may be an important risk factor for the
development of a second perhaps more prevalent disease.


http://www.prion2007.com/pdf/Prion%20Book%20of%20Abstracts.pdf


Subject: FELINE ALZHEIMER'S OR MAD CAT DISEASE I.E. FSE

Date: December 6, 2006 at 9:24 am PST

News & Events - 6 December 2006
Cats Can Succumb to Feline Alzheimer's
Ageing cats can develop a feline form of Alzheimer's disease, a new study reveals.

Researchers at the Universities of Edinburgh, St Andrews, Bristol and California have identified a key protein which can build up in the nerve cells of a cat's brain and cause mental deterioration.

In humans with Alzheimer's disease, this protein creates ‘tangles’ inside the nerve cells which inhibit messages being processed by the brain. The team says that the presence of this protein in cats is proof that they too can develop this type of disease.

By carrying out post-mortem examination of cats which have succumbed naturally to the disease, scientists may now be able to uncover vital clues about how the condition develops. This may eventually help scientists to come up with possible treatments.

Researchers already thought cats were susceptible to dementia because previous studies had identified thick, gritty plaques on the outside of elderly cats' brain cells which are similar to those found in humans.

By pinpointing this second key marker, the Edinburgh-led team says we can be sure that cats can suffer from a feline form of Alzheimer's.

Dr Danielle Gunn-Moore, at the University of Edinburgh's Royal (Dick) School of Veterinary Studies, said:

“This newly discovered protein is crucial to our understanding of the ageing process in cats. We've known for a long time that cats develop dementia, but this study tells us that the cat's neural system is being compromised in a similar fashion to that we see in human Alzheimer's sufferers. The gritty plaques had only hinted that might be the case - now we know.

“The shorter life-span of a cat, compared to humans, allows researchers to more rapidly assess the effects of diet, high blood pressure, and prescribed drugs on the course of the disease. However, we also need to understand more about our geriatric cats for their own benefit, so we can slow down the degeneration the disease brings and keep them as happy cats for as long as possible.”

The findings of the study are published in a recent edition of the Journal of Feline Medicine.

http://www.ed.ac.uk/news/061206cats.html

Late onset cerebellar degeneration in a middle-aged cat

Arianna Negrin DVM1, , , Marco Bernardini DVM, Dipl ECVN2, Wolfgang Baumgärtner Dr Med Vet, PhD, Dipl ECVP3 and Massimo Castagnaro DVM, PhD, Dipl ECVP1

1Department of Public Health, Comparative Pathology and Veterinary Hygiene, Faculty of Veterinary Medicine, Università degli Studi di Padova, Viale dell'Università, 16, 35020 Legnaro, Padova, Italy
2Department of Veterinary Clinical Science, Faculty of Veterinary Medicine, Università degli Studi di Padova, Viale dell'Università, 16, 35020 Legnaro, Padova, Italy
3Department of Pathology, University of Veterinary Medicine Hannover, Bünteweg 17, 30599 Hannover, Germany

Accepted 24 April 2006. Available online 15 June 2006.

Cerebellar degeneration (abiotrophy) (CD) is a spontaneous and accelerated degeneration of one or several mature cerebellar neuronal cell populations and has been described in many domestic animals, especially in dogs, with numerous breed-related cases. In cats, CD is mentioned as a rare sporadic entity. Late onset CDs are exceptionally uncommon and only two cases are reported in young adults, both aged 18 months. This report describes clinical and pathological findings of a late onset feline CD in a 9-year-old male Persian cat. The cat was presented with a history of progressive ataxia lasting 2 years. Neurological examination revealed severe neurological deficits such as generalised and severe ataxia, hypermetria in all four limbs, and bilateral absence of menace response. The lesion was diffusely localised in cerebellum. On gross pathology, the cerebellum appeared of normal size and shape and kidneys were characterised by mild hyperaemia. Histologically, lesions were limited to the cerebellum and kidneys. In the cerebellum, all cerebellar folia of both hemispheres and the vermis were affected. Changes were characterised by severe and diffuse loss of Purkinje cells, loss of cellularity in the granular layer, mild astrogliosis associated with moderate hypertrophy of Bergmann's glia. Immunohistochemistry for feline parvovirus antigen revealed a negative result. Renal lesions consisted of chronic fibrosis associated with chronic interstitial nephritis. CD is a rare disease and occurs commonly in puppies or young animals, who are clinically normal at birth and usually develop neurological signs within a few weeks or months after birth. This report represents the first case of CD in a middle-aged cat.


http://www.sciencedirect.com/


It was thought likely that at least some, and probably all, of the cases
in zoo animals were caused by the BSE agent. Strong support for this
hypothesis came from the findings of Bruce and others (1994)
( Bruce, M.E., Chree, A., McConnell, I., Foster, J., Pearson, G. &
Fraser, H. (1994) Transmission of bovine spongiform encephalopathy and
scrapie to mice: strain variation and species barrier. Philosophical
Transactions of the Royal Society B 343, 405-411: J/PTRSL/343/405
), who demonstrated that the pattern of variation in incubation period
and lesion profile in six strains of mice inoculated with brain
homogenates from an affected kudu and the nyala, was similar to that
seen when this panel of mouse strains was inoculated with brain from
cattle with BSE. The affected zoo bovids were all from herds that were
exposed to feeds that were likely to have contained contaminated
ruminant-derived protein and the zoo felids had been exposed, if only
occasionally in some cases, to tissues from cattle unfit for human
consumption.

snip...

http://www.bseinquiry.gov.uk/files/ws/s324.pdf


cases have been reported in domestic cats), are characterised by
long asymptomatic incubation periods followed by progressive
symptoms and signs of degeneration of the brain, leading
eventually to death.

http://www.bsereview.org.uk/download/draft_2.pdf


PET FOODS MAD CATS AND MAD DOGS BSE/TSEs

worse still, there is serious risk the media could get
to hear of such a meeting...

snip...

Crushed heads (which inevitably involve brain and spinal cord material)
are used to a limited extent but will also form one of the constituent
raw materials of meat and bone meal, which is used extensively in
pet food manufacturer...

http://www.bseinquiry.gov.uk/files/yb/1989/03/17004001.pdf


2. The Parliamentary Secretary said that he was concerned
about the possibility that countries in which BSE had not
yet been detected could be exporting raw meat materials
(in particular crushed heads) contaminated with the disease
to the UK for use in petfood manufacture...

snip...

YOU explained that imported crushed heads were extensively used in the
petfood industry...

http://www.bseinquiry.gov.uk/files/yb/1989/04/14001001.pdf


In particular I do not believe one can say that the levels of
the scrapie agent in pet food are so low that domestic animals are
not exposed...

http://www.bseinquiry.gov.uk/files/yb/1989/04/24003001.pdf


http://www.bseinquiry.gov.uk/files/yb/1989/04/25001001.pdf


some 100+ _documented_ TSE cats of all types later...tss

on occassions, materials obtained from slaughterhouses
will be derived from sheep affected with scrapie or
cattle that may be incubating BSE for use in petfood manufacture...

http://www.bseinquiry.gov.uk/files/yb/1989/05/03007001.pdf


Meldrum's notes on pet foods and materials used

http://www.bseinquiry.gov.uk/files/yb/1989/05/16001001.pdf

http://www.bseinquiry.gov.uk/files/yb/1989/05/16002001.pdf


IN CONFIDENCE CJD TO CATS...

http://www.bseinquiry.gov.uk/files/yb/1989/05/18002001.pdf


Confidential BSE and __________________

http://www.bseinquiry.gov.uk/files/yb/1989/05/22012001.pdf


1st case natural FSE

http://www.bseinquiry.gov.uk/files/yb/1990/05/09002001.pdf


FSE and pharmaceuticals

http://www.bseinquiry.gov.uk/files/yb/1990/05/10005001.pdf


confidential cats/dogs and unsatisfactory posture
MAFFs failure to assure key research

http://www.bseinquiry.gov.uk/files/yb/1990/06/14006001.pdf


can't forget about the mad man and his mad cat ;

Deaths of CJD man and cat linked

http://news.bbc.co.uk/1/hi/health/184558.stm


In October 1998 the simultaneous occurrence of spongiform encephalopathy
in a man and his pet cat was reported. The report from Italy noted that
the cat did not display the same clinical features as FSE cases
previously seen. Indeed, the presence of a new type of FSE was
suggested. The man was diagnosed as having sporadic CJD, and neither
case (man nor cat) appeared to be affected by a BSE-related condition.

http://www.defra.gov.uk/animalh/bse/bse-science/level-4-othertses.html


Image] Research letters Volume 352, Number 9134 [Image] 3 October1998[Previous] [Next] [Image][Image]

Simultaneous occurrence of spongiform encephalopathy in a manand his cat in Italy

[Image] Gianluigi Zanusso, Ettore Nardelli, Anna Rosati, GianMaria Fabrizi, SergioFerrari, Antonella Carteri, Franco De Simone, Nicola Rizzuto, SalvatoreMonaco

Transmissible spongiform encephalopathies (TSE) encompass inherited,acquired, and sporadic mammalian neurological disorders, and arecharacterised by the conversion of the cellular prion protein (PrP) in aninsoluble and protease-resistant isoform (PrPres). In human TSE, four typesof PrPres have been identified according to size and glycoform ratios, whichmay represent different prion strains. Type-1 and type-2 PrPres areassociated with sporadic Creutzfeldt-Jakob disease (CJD), type 3 withiatrogenic CJD, and type 4 with variant CJD.1,2 There is evidence thatvariant CJD is caused by the bovine spongiform encephalopathy (BSE)-prionstrain.2-4 The BSE strain has been identified in three cats with felinespongiform encephalopathy (FSE), a prion disease which appeared in 1990 inthe UK.5 We report the simultaneous occurrence of sporadic CJD in a man anda new variety of FSE in his cat. A 60-year-old man, with no unusual dietary habits, was admitted in November,1993, because of dysarthria, cerebellar ataxic gait, visual agnosia, andmyoclonus. An electroencephalogram (EEG) showed diffuse theta-deltaactivity. A brain magnetic resonance imaging scan was unremarkable. 10 dayslater, he was speechless and able to follow only simple commands. RepeatEEGs showed periodic triphasic complexes. 2 weeks after admission, he wasmute, akinetic, and unable to swallow. He died in early January, 1994. His 7-year-old, neutered, female shorthaired cat presented in November,1993, with episodes of frenzy, twitching of its body, and hyperaesthesia.The cat was usually fed on canned food and slept on its owner's bed. Nobites from the cat were recalled. In the next few days, the cat becameataxic, with hindquarter locomotor dysfunction; the ataxia got worse andthere was diffuse myoclonus. The cat was killed in mid-January, 1994. No pathogenic mutations in the patient's PrP gene were found. The patientand the cat were methionine homozygous at codon 129. Histology of thepatient's brain showed neocortical and cerebellar neuronal loss,astrocytosis, and spongiosis (figure A). PrP immunoreactivity showed apunctate pattern and paralleled spongiform changes (figure B). The cat'sbrain showed mild and focal spongiosis in deeper cortical layers of all fourlobes (figure C), vacuolated cortical neurons (figure D), and mildastrogliosis. The cerebellar cortex and the dentate nucleus were gliosed.Immunoreactive PrP showed a punctate pattern in neocortex, allocortex, andcaudate nucleus (figure E). Western blot analysis of control and affectedhuman and cat brain homogenates showed 3 PrP bands of 27-35 kDa. Afterdigestion with proteinase K and deglycosylation, only samples from theaffected patient and cat showed type-1 PrPres, with PrP glycoform ratioscomparable to those observed in sporadic CJD1 (details available fromauthor). [Image] Microscopic sections of patient and cat brains A: Occipital cortex of the patient showing moderate spongiformdegeneration and neuronal loss (haematoxylin and eosin) and B: punctateperineuronal pattern of PrP immunoreactivity; peroxidaseimmunohistochemistry with monoclonal antibody 3F4. C: cat parietal cortexshowing mild spongiform degeneration (haematoxylin and eosin).D:vacuolated neurons (arrow, haematoxylin and eosin), E: peroxidaseimmunohistochemistry with antibody 3F4 shows punctate perineuronaldeposition of PrP in temporal cortex. This study shows a spatio-temporal association between human and felineprion diseases. The clinical features of the cat were different frompreviously reported cases of FSE which were characterised by gradual onsetof behavioural changes preceding locomotor dysfunction and ataxia.5Neuropathological changes were also at variance with the diffuse spongiosisand vacuolation of brainstem neurons, seen in FSE.5 The synaptic pattern ofPrP deposition, similar in the cat and in the patient, was atypical for aBSE-related condition. Evidence of a new type of FSE was further provided bythe detection of a type-1 PrPres, other than the BSE-associated type 4.2Taken together, our data suggest that the same agent strain of sporadic CJD was involved in the patient and in his cat. It is unknown whether these TSE occurred as the result of horizontaltransmission in either direction, infection from an unknown common source,or the chance occurrence of two sporadic forms. 1 Parchi P, Castellani R, Capellari S, et al. Molecular basis of phenotypicvariablity in sporadic Creutzfeldt-Jakob disease.

Ann Neurol 1996; 39:767-78 [PubMed]. 2 Collinge J, Sidle KCL, Meads J, Ironside J, Hill AF. Molecular analysis ofprion strain variation and the aetiology of 'new variant' CJD. Nature 1996;383: 685-90 [PubMed]. 3 Bruce ME, Will RG, Ironside JW, et al.

Transmissions to mice indicate that'new variant' CJD is caused by the BSE agent.

Nature 1997; 389: 498-501[PubMed]. 4 Hill AF, Desbruslais M, Joiner S, et al. The same prion strain causes vCJDand BSE. Nature 1997; 389: 448-50 [PubMed]. 5 Pearson GR, Wyatt JM, Henderson JP, Gruffydd-Jones TJ. Feline spongiformencephalopathy: a review. Vet Annual 1993; 33: 1-10. Sezione di Neurologie Clinica, Dipartimento di Scienze Neurologiche e dellaVisione, Università di Verona, Policlinico Borgo Roma, 37134 Verona, Italy(S Monaco; e mail rizzuto@Gorgorna.univr.it); and Istituto ZooprofilatticoSperimentale della Lombardia e dell' Emilia, Brescia =========================================TSS

indeed there have been 4 documented cases of TSE in Lions to date.

Lion 32 December 98 Born November 86

Lion 33 May 1999 (euthanased) Born November 81.

Lion 36 Euthanased August 2000 Born July 87. Deteriorating hind limb
ataxia.

Lion 37 Euthanased November 2001 Male, 14 years. Deteriorating hind
limb ataxia since September 2001. (Litter mate to Ref. 36.)

http://www.defra.gov.uk/animalh/bse/index.html


go to the url above, on the bar at the top, click on _statistics_,
then in middle of next page, click on _other TSEs_.

or go here;

http://www.defra.gov.uk/animalh/bse/bse-statistics/level-3-tsestat.html

and

http://www.defra.gov.uk/animalh/bse/bse-science/level-4-othertses.html


http://www.bseinquiry.gov.uk/files/yb/1992/11/13001001.pdf


also;

Reports on the clinical symptoms presented by these cats give a
relatively homogeneous picture: Affected cats show a lack of
coordination with an ataxia mainly of the hind limbs, they often fall
and miss their target when jumping. Fear and increased aggressiveness
against the owner and also other animals is often seen. They do not
longer tolerate to be touched (stroked) and start hiding. These
behavioural chances might be the result of a hypersensibility to touch
and noise, but also to increased fear. Excessive salivation is another
more frequently seen symptom. Cats with FSE in general show severe
behavioural disturbances, restlessness and depression, and a lack of
coat cleaning. Symptoms in large cats in general are comparable to those
in domestic cats. A
report on FSE (in german) has been presented in 2001 in the Swiss FVO
Magazin. A paper on the first FSE case in a domestic cat in Switzerland
is currently in press in the Journal Schweizer Archiv für Tierheilkunde
(SAT).

http://www.neurocenter-bern.ch/tse_e.shtml


Subject: DEER SPONGIFORM ENCEPHALOPATHY SURVEY & HOUND STUDY

Date: Thu, 17 Oct 2002 17:04:51 -0700
From: "Terry S. Singeltary Sr."
Reply-To: Bovine Spongiform Encephalopathy
To: BSE-L

Greetings BSE-L,

is there any other CWD surveys/testing in the UK on their deer?
what sort of testing has been done to date on UK/EU deer?
any input would be helpful... thank you

DEER SPONGIFORM ENCEPHALOPATHY SURVEY

http://www.bseinquiry.gov.uk/files/yb/1991/11/20004001.pdf


http://www.bseinquiry.gov.uk/files/yb/1992/11/04002001.pdf


hope they did not go by the wayside as the hound study;

http://www.bseinquiry.gov.uk/files/yb/1991/10/18001001.pdf


http://www.bseinquiry.gov.uk/files/yb/1993/12/06001001.pdf


37. Putative TSE in hounds - work started 1990 -(see para 41)

Robert Higgins, a Veterinary Investigation Officer at Thirsk,
had been working on a hound survey in 1990. Gerald Wells
and I myself received histological sections from this survey
along with the accompanying letter (YB90/11.28/1.1) dated
November 1990. This letter details spongiform changes found
in brains from hunt hounds failing to keep up with the rest of
the pack, along with the results of SAF extractions from
fresh brain material from these same animals. SAFs were not
found in brains unless spongiform changes were also present.
The spongiform changes were not pathognomonic (ie.
conclusive proof) for prion disease, as they were atypical,
being largely present in white matter rather than grey matter in
the brain and spinal cord. However, Tony Scott, then head of
electron microscopy work on TSEs, had no doubt that these
SAFs were genuine and that these hounds therefore must have
had a scrapie-like disease. I reviewed all the sections
myself (original notes appended) and although the pathology
was not typical, I could not exclude the possibility that this was
a scrapie-like disorder, as white matter vacuolation is seen
in TSEs and Wallerian degeneration was also present in the
white matter of the hounds, another feature of scrapie.

38. I reviewed the literature on hound neuropathology, and
discovered that micrographs and descriptive neuropathology from
papers on 'hound ataxia' mirrored those in material from
Robert Higgins' hound survey. Dr Tony Palmer (Cambridge) had
done much of this work, and I obtained original sections
from hound ataxia cases from him. This enabled me provisionally to
conclude that Robert Higgins had in all probability detected
hound ataxia, but also that hound ataxia itself was possibly a
TSE. Gerald Wells confirmed in 'blind' examination of single
restricted microscopic fields that there was no distinction
between the white matter vacuolation present in BSE and
scrapie cases, and that occurring in hound ataxia and the hound
survey cases.

39. Hound ataxia had reportedly been occurring since the 1930's,
and a known risk factor for its development was the feeding
to hounds of downer cows, and particularly bovine offal.
Circumstantial evidence suggests that bovine offal may also be
causal in FSE, and TME in mink. Despite the inconclusive
nature of the neuropathology, it was clearly evident that this
putative canine spongiform encephalopathy merited further
investigation.

40. The inconclusive results in hounds were never confirmed,
nor was the link with hound ataxia pursued. I telephoned Robert
Higgins six years after he first sent the slides to CVL.
I was informed that despite his submitting a yearly report to the
CVO including the suggestion that the hound work be continued,
no further work had been done since 1991. This was
surprising, to say the very least.

41. The hound work could have provided valuable evidence
that a scrapie-like agent may have been present in cattle offal long
before the BSE epidemic was recognised. The MAFF hound
survey remains unpublished.

Histopathological support to various other published
MAFF experiments

42. These included neuropathological examination of material
from experiments studying the attempted transmission of BSE to
chickens and pigs (CVL 1991) and to mice (RVC 1994).

http://www.bseinquiry.gov.uk/witness/htm/stat067.htm


nothing to offer scientifically;

http://www.bseinquiry.gov.uk/files/yb/1991/10/17001001.pdf


maddogs and Englishman

http://www.bseinquiry.gov.uk/files/yb/1990/11/28001001.pdf


kind regards,
terry

###########bse-l ############

Subject: Re: DEER SPONGIFORM ENCEPHALOPATHY SURVEY & HOUND STUDY
Date: Fri, 18 Oct 2002 23:12:22 +0100
From: Steve Dealler
Reply-To: Bovine Spongiform Encephalopathy
Organization: Netscape Online member
To: BSE-L@
References:

Dear Terry,

An excellent piece of review as this literature is desparately difficult
to get back from Government sites.

What happened with the deer was that an association between deer meat
eating and sporadic CJD was found in about 1993. The evidence was not great but did not
disappear after several years of asking CJD cases what they had eaten.
I think that the work into deer disease largely stopped because it was
not helpful to the UK industry...and no specific cases were reported.
Well, if you dont look adequately like they are in USA currenly then you
wont find any!

Steve Dealler
===============

Incubation periods for BSE are proportional to the life expectancy of
the animal affected. The disease's incubation period is 18% of a cow's
life expectancy and would be expected to about double when crossing to
another species [-] that is, to 36% of 70 years in humans.

Steve Dealler, consultant in medical microbiology.
Burnley General Hospital, Burnley BB10 2PQ deal@airtime.co.uk

TSS

########### http://mailhost.rz.uni-karlsruhe.de/warc/bse-l.html ############

Docket Management Docket: 02N-0273 - Substances Prohibited From Use in
Animal Food or Feed; Animal Proteins Prohibited in Ruminant Feed
Comment Number: EC -10
Accepted - Volume 2 [PART 1]

http://www.fda.gov/ohrms/dockets/dailys/03/Jan03/012403/8004be07.html

Docket Management Docket: 02N-0273 - Substances Prohibited From Use in
Animal Food or Feed; Animal Proteins Prohibited in Ruminant Feed
Comment Number: EC -11
Accepted - Volume 2 [PART 2]

http://www.fda.gov/ohrms/dockets/dailys/03/Jan03/012403/8004be09.html


August 22, 2003 5:11 PM

Mad cat disease

A second case of feline spongiform encephalopathy (FSE), a disease
affecting the brain tissue of cats, has been recorded in Switzerland.
The veterinary authorities said the likely cause of the infection, which
is similar to mad cow disease, was contaminated pet food.
A first case of FSE was reported two years ago.
Experts say the disease poses no health risk for people.

swissinfo

http://www.swissinfo.org/sen/Swissinfo.html?siteSect=113&sid=41558971


: Ann N Y Acad Sci. 1982;396:131-43. Links Alzheimer's disease and transmissible virus dementia (Creutzfeldt-Jakob disease).Brown P, Salazar AM, Gibbs CJ Jr, Gajdusek DC. Ample justification exists on clinical, pathologic, and biologic grounds for considering a similar pathogenesis for AD and the spongiform virus encephalopathies. However, the crux of the comparison rests squarely on results of attempts to transmit AD to experimental animals, and these results have not as yet validated a common etiology. Investigations of the biologic similarities between AD and the spongiform virus encephalopathies proceed in several laboratories, and our own observation of inoculated animals will be continued in the hope that incubation periods for AD may be even longer than those of CJD.

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=6758661&query_hl=3&itool=pubmed_DocSum1:


Neurology. 1990 Feb;40(2):226-8. Coexistence of Creutzfeldt-Jakob disease and Alzheimer's disease in the same patient.Brown P, Jannotta F, Gibbs CJ Jr, Baron H, Guiroy DC, Gajdusek DC. Laboratory of CNS Studies, NINDS, National Institutes of Health, Bethesda, MD 20892.

We report the case of a 73-year-old patient in whom a diagnosis of Creutzfeldt-Jakob disease, suggested by the clinical course, was verified by the neuropathologic finding of widespread spongiform change and astrogliosis, the presence of proteinase-resistant protein in brain extracts, and the experimental transmission of spongiform encephalopathy to primates inoculated with brain tissue. However, neuropathologic examination also revealed a profusion of senile and neuritic plaques and neurofibrillary tangles that reacted with antibody to the amyloid beta-protein characteristic of Alzheimer's disease, but not with antibody to the scrapie amyloid protein characteristic of Creutzfeldt-Jakob disease.

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=2405293&query_hl=9&itool=pubmed_DocSum1:


Prog Clin Biol Res. 1989;317:549-57. Links Neuroaxonal dystrophy: an ultrastructural link between subacute spongiform virus encephalopathies and Alzheimer's disease.Liberski PP, Yanagihara R, Gibbs CJ Jr, Gajdusek DC. Laboratory of Central Nervous System Studies, National Institute of Neurological Disorders and Stroke, Bethesda, Maryland 20892.====================

Unconventional Viruses and the Origin and Disappearance of Kuru

333334 Physiology or Medicine 1976Table 12.

Creutzfeldt-Jakob disease in cats Incubation period(months)Duration(months)Primary passage Human brain Serial passage Cat brain (passage 1)Cat brain (passage 2)This geographic and temporal clustering does not apply, however, to a majority of cases and is unexplained by the 10% of the cases that are familial.Matthews has recently made a similar observation in two clusters in England(50). There are two reports of conjugal disease in which husband and wife diedof CJD within a few years of each other (30, 50).The prevalence of CJD has varied markedly in time and place throughout the United States and Europe, but we have noted a trend toward making the diagnosis more frequently in many neurological clinics in recent years, sinceattention has been drawn to the syndrome by its transmission to primates(3, 33). For many large population centers of the United States, Europe,Australia, and Asia, we have found a prevalence approaching one per millionwith an annual incidence and a mortality of about the same magnitude, asthe average duration of the disease is 8 to 12 months. Matthews (50) found anannual incidence of 1.3 per million in one of his clusters, which was over 10times the overall annual incidence for the past decade for England andWales (0.09 per million). Kahana et al. (40) reported the annual incidence ofCJD ranging from 0.4 to 1.9 per million in various ethnic groups in Israel. Theynoted, however, a 30-fold higher incidence of CJD in Jews of Libyan originabove the incidence in Jews of European origin. From recent discussions withour Scandinavian colleagues it is apparent that an annual incidence of at leastone per million applies to Sweden and Finland in recent years.Probable man-to-man transmission of CJD has been reported in a recipientof a cornea1 graft, which was taken from a donor who was diagnosed retrospectivelyto have had pathologically confirmed CJD ( 12). The disease occurred18 months after the transplant, an incubation period just the average forchimpanzees inoculated with human CJD brain tissue (32, 62). From suspensionof brain of the cornea1 graft recipient we succeeded in transmitting CJDto a chimpanzee although the brain had been at room temperature in 10%formol-saline for seven months (26a). More recently we learned that two of ourconfirmed cases of TVD were professional blood donors until shortly beforethe onset of their symptoms. To date, there have been no transmissions of CJDfrom blood of either human patients or animals affected with the experimentallytransmitted disease. However, we have only transfused two chimpanzees eachwith more than 300 ml of human whole blood from a different CJD patientUnconventional Viruses and the origin and Disappearance of KuruFigure 20. Six serial passages of CJD in chimpanzees, starting with brain tissue from abiopsy of a patient (R. R.) with CJD in the United Kingdom (U. K.). Also shown is transmissionof the disease directly from man to the capuchin monkey and marmoset, and fromchimpanzee brain to three species of New World monkeys (squirrel, capuchin, spidermonkeys), and to six Old World species (rhesus, stumptailed, cynomolgus, African green,pigtailed, and sooty mangabey). Incubation periods in the New World monkeys rangedfrom 19 to 47 months, and in the Old World monkeys from 43 to 60 months. The pigtailedmacaque and the sooty mangabey showed positive CJD pathology when sacrificed without336 Physiology or Medicine 1976within the past several months. Finally, the recognition of TVD in a neurosurgeon(27), and more recently in two physicians, has raised the question ofpossible occupational infection, particularly in those exposed to infected humanbrain tissue during surgery, or at postmortem examination (61, 63).The unexpectedly high incidence of previous craniotomy in CJD patientsnoted first by Nevin et al. (51) and more recently by Matthews (50) and byourselves (62), raises the possibility of brain surgery either affording a mode ofentry for the agent or of precipitating the disease in patients already carryinga latent infection. The former unwelcome possibility now seems to be areality with the probable transmission of CJD to two young patients withepilepsy from the use of implanted silver electrodes sterilized with 70%ethanol and formaldehyde vapor after contamination from their use on apatient who had CJD. The patients had undergone such electrode implantationfor stereotactic electroencephalographic localization of the epileptic focusat the time of correctional neurosurgery (3a).Two patients with transmissible virus dementias were not diagnosed clinicallyor neuropathologically as having CJD, but rather as having Alzheimer’sdisease (62). In both cases the disease was familial: in one (Fig. 21) therewere six close family members with the disease in two generations; in the otherboth the patient’s father and sister had died of presenile dementia. Thediseases as transmitted to primates were clinically and pathologically typicalsubacute spongiform virus encephalopathies, and did not have pathologicalfeatures of Alzheimer’s disease in man. More than 30 additional specimens ofbrain tissue from non-familial Alzheimer’s disease have been inoculated intoTVD-susceptible primates without producing disease. Therefore, although weclinical disease. A third passage to the chimpanzee was accomplished using frozen andthawed explanted tissue culture of brain cells that had been growing in vitro for 36 days.Using 10-3, 10-4, and 10-4 dilutions of brain, respectively, the 4th, 5th, and 6th chimpanzeepassages were accomplished. This indicates that the chimpanzee brain contains >50,000infectious doses per gram, and that such infectivity is maintained in brain cells cultivatedin vitro at 37” C for at least one month. The lower left shows transmission of CJD from asecond human patient (J. T.) to a cat with a 30 month incubation and serial passage in thecat with 19 to 24 month incubation.Unconventional Viruses and the Origin and Disappearance of Kum 337Figure 21a. Y family. Brain tissue obtained from patient A. Y. at biopsy induced subacutespongiform encephalopathy in a squirrel monkey 24 months after intracerebral inoculation.The patient, a 48-year old woman who died after a 68 month course of progressive dementia,quite similar in clinical aspects to the progressive dementia from which her fatherand brother had died at 54 and 56 years of age, respectively, was diagnosed clinically andneuropathologically as suffering from Alzheimer’s disease. Her sister is at present incapacitatedby a similar progressive dementia of 4 years’ duration. Although the transmitteddisease in the squirrel monkey was characterized by severe status spongiosis, none was seenin the patient. although amyloid plaques and neurofibrillary tangles were frequent.21b. H family. Brain tissue obtained from patient B. H. at surgical biopsy induced subacutespongiform encephalopathy in a squirrel monkey and a capuchin monkey 29 1/2 monthsand 43 months, respectively, after intracerebral inoculations. The patient, a 57 year oldwoman, has had slowly progressive dementia and deterioration for the past 7 years. Neuropathologicalfindings revealed abundant neurofibrillary tangles and senile plaques and noevidence of status spongiosis. The patient’s father, A. S., had died at age 64 following severalyears of progressive dementia, behavioral change and memory loss. B. H. is presently aliveand institutionalized.338 Physiology or Medicine 1976cannot claim to have transmitted the classical sporadic Alzheimer’s disease toprimates, we are confronted with the anomaly that the familial form ofAlzheimer’s disease has, in these two instances, transmitted as though it wereCJD.The above findings have added impetus to our already extensive studies ofHuntington’s chorea, Alzheimer’s and Pick’s diseases, parkinsonism-dementia,senile dementia, and even “dementia praecox", the organic brain diseaseassociated with late uncontrolled schizophrenia. ......

http://nobelprize.org/nobel_prizes/medicine/laureates/1976/gajdusek-lecture.pdf


GAH WELLS (very important statement here...TSS)

HOUND STUDY AS implied in the Inset 25 we must not _ASSUME_ that transmission of BSE to other species will invariably present pathology typical of a scrapie-like disease.


snip...


http://www.bseinquiry.gov.uk/files/yb/1991/01/04004001.pdf

76 pages on hound study;


http://www.bseinquiry.gov.uk/files/sc/seac16/tab04.pdf


The spongiform changes were not pathognomonic (ie. conclusive proof) for prion disease, as they were atypical, being largely present in white matter rather than grey matter in the brain and spinal cord. However, Tony Scott, then head of electron microscopy work on TSEs, had no doubt that these SAFs were genuine and that these hounds therefore must have had a scrapie-like disease. I reviewed all the sections myself (original notes appended) and although the pathology was not typical, I could not exclude the possibility that this was a scrapie-like disorder, as white matter vacuolation is seen in TSEs and Wallerian degeneration was also present in the white matter of the hounds, another feature of scrapie. 38.I reviewed the literature on hound neuropathology, and discovered that micrographs and descriptive neuropathology from papers on 'hound ataxia' mirrored those in material from Robert Higgins' hound survey. Dr Tony Palmer (Cambridge) had done much of this work, and I obtained original sections from hound ataxia cases from him. This enabled me provisionally to conclude that Robert Higgins had in all probability detected hound ataxia, but also that hound ataxia itself was possibly a TSE. Gerald Wells confirmed in 'blind' examination of single restricted microscopic fields that there was no distinction between the white matter vacuolation present in BSE and scrapie cases, and that occurring in hound ataxia and the hound survey cases. 39.Hound ataxia had reportedly been occurring since the 1930's, and a known risk factor for its development was the feeding to hounds of downer cows, and particularly bovine offal. Circumstantial evidence suggests that bovine offal may also be causal in FSE, and TME in mink. Despite the inconclusive nature of the neuropathology, it was clearly evident that this putative canine spongiform encephalopathy merited further investigation. 40.The inconclusive results in hounds were never confirmed, nor was the link with hound ataxia pursued. I telephoned Robert Higgins six years after he first sent the slides to CVL. I was informed that despite his submitting a yearly report to the CVO including the suggestion that the hound work be continued, no further work had been done since 1991. This was surprising, to say the very least. 41.The hound work could have provided valuable evidence that a scrapie-like agent may have been present in cattle offal long before the BSE epidemic was recognised. The MAFF hound survey remains unpublished. Histopathological support to various other published MAFF experiments 42.These included neuropathological examination of material from experiments studying the attempted transmission of BSE to chickens and pigs (CVL 1991) and to mice (RVC 1994).


http://www.bseinquiry.gov.uk/witness/htm/stat067.htm


It was thought likely that at least some, and probably all, of the cases in zoo animals were caused by the BSE agent. Strong support for this hypothesis came from the findings of Bruce and others (1994) ( Bruce, M.E., Chree, A., McConnell, I., Foster, J., Pearson, G. & Fraser, H. (1994) Transmission of bovine spongiform encephalopathy and scrapie to mice: strain variation and species barrier. Philosophical Transactions of the Royal Society B 343, 405-411: J/PTRSL/343/405 ), who demonstrated that the pattern of variation in incubation period and lesion profile in six strains of mice inoculated with brain homogenates from an affected kudu and the nyala, was similar to that seen when this panel of mouse strains was inoculated with brain from cattle with BSE. The affected zoo bovids were all from herds that were exposed to feeds that were likely to have contained contaminated ruminant-derived protein and the zoo felids had been exposed, if only occasionally in some cases, to tissues from cattle unfit for human consumption.


snip...


http://www.bseinquiry.gov.uk/files/ws/s324.pdf


2005

DEFRADepartment for Environment,Food & Rural Affairs

Area 307, London, SW1P 4PQTelephone: 0207 904 6000Direct line: 0207 904 6287E-mail: h.mcdonagh.defra.gsi.gov.uk

GTN:FAX:

Mr T S SingeltaryP.O. Box 42BacliffTexasUSA 77518

21 November 2001

Dear Mr Singeltary TSE IN HOUNDS

Thank you for e-mail regarding the hounds survey. I am sorry for the long delay in responding.

As you note, the hound survey remains unpublished. However the Spongiform Encephalopathy Advisory Committee (SEAC), the UK Government's independent Advisory Committee on all aspects related to BSE-like disease, gave the hound study detailed consideration at their meeting in January 1994. As a summary of this meeting published in the BSE inquiry noted, the Committee were clearly concerned about the work that had been carried out, concluding that there had clearly been problems with it, particularly the control on the histology, and that it was more or less inconclusive. However was agreed that there should be a re-evaluation of the pathological material in the study.

Later, at their meeting in June 95, The Committee re-evaluated the hound study to see if any useful results could be gained from it. The Chairman concluded that there were varying opinions within the Committee on further work. It did not suggest any further transmission studies and thought that the lack of clinical data was a major weakness.

Overall, it is clear that SEAC had major concerns about the survey as conducted. As a result it is likely that the authors felt that it would not stand up to peer review and hence it was never published. As noted above, and in the detailed minutes of the SEAC meeting in June 95, SEAC considered whether additional work should be performed to examine dogs for evidence of TSE infection. Although the Committee had mixed views about the merits of conducting further work, the Chairman noted that when the Southwood Committee made their recommendation to complete an assessment of possible spongiform disease in dogs, no TSEs had been identified in other species and hence dogs were perceived as a high risk population and worthy of study. However subsequent to the original recommendation, made in 1990, a number of other species had been identified with TSE ( e.g. cats) so a study in hounds was less critical.

For more details see-

http://www.bseinquiry.gov.uk/files/yb/1995/06/21005001.pdf


As this study remains unpublished, my understanding is that the ownership of the data essentially remains with the original researchers. Thus unfortunately, I am unable to help with your request to supply information on the hound survey directly. My only suggestion is
that you contact one of the researchers originally involved in the project, such as Gerald Wells. He can be contacted at the following address.

Dr Gerald Wells, Veterinary Laboratories Agency, New Haw, Addlestone, Surrey, KT 15 3NB, UK

You may also wish to be aware that since November 1994 all suspected cases of spongiform encephalopathy in animals and poultry were made notifiable. Hence since that date there has been a requirement for vets to report any suspect SE in dogs for further investigation. To date there has never been positive identification of a TSE in a dog.

I hope this is helpful

Yours sincerely 4

HUGH MCDONAGHBSE CORRESPONDENCE SECTION

============================================

This an excellent review by Terry Singeltary: see message on 1.3.5
concerning pet food manufacture and rulings.
http://www.priondata.org/data/A_deerdog.html

NOW, ASK yourself how many dogs and cats are ever examined and autopsied for a TSE in the USA SAME AS HUMANS, OR EVEN LESS, VERY VERY FEW............


Cerebral Biopsies in Dementia-- Hulette et al 31

Accepted for publication July 11, 1991. From the Department of Pathology, Division of Neuropathology (Drs Hulette and Crain), the Department of Medicine, Division of Neurology (Dr Earl), and the Department of Neurobiology (Dr. Crain), Duke University Medical Center, Durham, NC.

Arch Neurol--Vol 49, January 1992

TSS/5/7/01

http://mailhost.rz.uni-karlsruhe.de/warc/bse-l.html


==============================

OTHER URLS OF INTEREST

1996). Stanley Prusinger, the scientist who coined the term prion, speculates Alzheimer's may in fact turn out to be a prion disease (Prusiner, 1984). In ...

http://www.cyber-dyne.com/~tom/Alzheimer_cjd.html#similar


http://www.bseinquiry.gov.uk/files/ws/s194.pdf


http://www.cjd.ed.ac.uk/path.htm


MULTIMODAL EVOKED POTENTIALS IN MOUSE MODELS OF NEURODEGENERATION

Transmissible spongiform encephalopathies and Alzheimer's disease are neurodegenerative disorders in which neuropathologic changes are associated with accumulation of prion protein and deposition of amyloid ß-protein, respectively. Recently, transgenic mice that overexpress a mutant human ß-amyloid precursor protein and mice devoid of prion protein were generated. However, few electrophysiologic studies in intact freely moving...

snip...

full text;

http://www.scripps.edu/research/sr2000/np11.html


Causes of Alzheimer's and "Mad-Cow" Diseases

Alzheimer's and "mad-cow" diseases are unique in that their infectious agents are not viruses or germs, but rather proteins. The brains of patients who suffered from Alzheimer's or cows that died of "mad-cow" disease show deposits of abnormal tissue called amyloid plaques. The primary component of these plaques is a protein called prion protein or PrP. Chemical and biochemical analysis showed that there was no difference in composition or primary structure between the normal, cellular form of PrP (PrPC, shown at right) and the disease form of PrP (PrPSc). Further analysis showed that PrPC can change into PrPSc when two of the a helices (shown in green) change into ß sheets. This ß sheet can then induce a similar change in another molecule of PrPC and hydrogen bond to it. The PrPSc 's then polymerize and come out of solution, forming the plaques found in Alzheimer's patients and mad cows. How the plaques cause the symptoms of the diseases is still not clear, but the prion protein holds the unique distinction of causing a disease solely through a small alteration in secondary structure.

full text;

http://genchem.chem.wisc.edu/netorial/modules/biomolecules/protein2/prot210.htm


importantly, recent findings indicating that the cellular accumulation of incorrectly folded proteins is the molecular basis of many diseases, including Alzheimer's Disease, Prion Diseases and Huntington Disease, underscore the importance of understanding the mechanisms of folding in vivo. Alzheimer's and prion disease appear to be caused by the generation of a "pathological" conformation in the newly translated protein that would otherwise fold to a normal conformation that does not produce the disease. In some model systems, molecular chaperones appear to play a role in this conformational change. Thus, developing approaches to study protein folding under physiological conditions is essential to understand how folding defects can lead to disease.

full text;

http://www.stanford.edu/group/frydman/interests.htm


Implications for Alzheimer's disease

Harris also has recently expanded his research to include Alzheimer's disease, which shares several features with prion diseases despite being non-infectious. Leonard Berg, M.D., professor of neurology and former director of the Alzheimer's Disease Research Center at the medical school, and other colleagues say Harris readily applies his extensive knowledge of cell biology to this area as well.

http://record.wustl.edu/archive/1998/02-12-98/3678.html


RESEARCH LETTERS

Early-Onset Familial Alzheimer Disease With Coexisting [beta] -Amyloid and Prion Pathology

To the Editor: Familial Alzheimer disease (AD) with early onset has been linked to 3 different genes with an autosomal dominant mode of inheritance: [beta] -amyloid, protein precursor, and the presenilins 1 and 2, representing not more than 50% of all cases of early-onset AD cases.1 Thus, the genetic defect remains unexplained in at least half of the families with histories of early onset of AD. We have recently described such a Swiss family whose members presented with a standard clinical and neuropathologic profile of AD.2 In particular, severe neurofibrillary tangle degeneration was present in the hippocampus and in several cortical areas, together with a large amount of [beta] -amyloid deposits and senile plaques (SPs). However, known mutations have not been found, either in the [beta] -amyloid precursor protein or in the presenilin 1 and 2 genes.2 We now report that the brains of 5 deceased members of this family, from 2 generations, present a coexisting [beta] -amyloid and prion protein (PrP) pathology.


Methods http://jama.ama-assn.org/images/dot_lgray_999999.gif


Five available cases with clinical AD were diagnosed using the Diagnostic and Statistical Manual of Mental Disorders, Revised Third Edition, criteria. The age at onset of disease ranged from 43 to 64 years (mean, 55.8 years) and age at death ranged from 55 to 81 years (mean, 67.4 years). In addition, 4 of the 5 cases had epileptic features. Serial frozen sections (50 µm thick) through the temporal and frontal cortex of the 5 formalin-treated brains were pretreated with formic acid. They were then processed using monoclonal antibodies against amyloid- [beta] 40 peptide (1:100; [Sigma] ) and against PrP106-126 (1:200; produced by one of us).3 The latter antibody specifically marks the pathological isoform of the PrP and does not cross-react with [beta] -amyloid deposits. In addition, double immunostaining using successive anti- [beta] -amyloid and anti-PrP106-126 antibodies was performed.


Results http://jama.ama-assn.org/images/dot_lgray_999999.gif


In all 5 cases, the cerebral cortex revealed spongiform changes, mainly in superficial layers, and some degree of gliosis. Neurofibrillary tangle and neuritic plaques revealed by Gallyas were numerous in all cortical regions including the primary visual area. In addition, frequent [beta] -amyloid-positive SPs were observed, together with SP stained by the monoclonal antibody against PrP106-126. Successive sections alternately stained with the 2 antibodies showed that both [beta] -amyloid and PrP106-126 positive SP are deposited in all layers of the frontal and temporal cortex. A population of SP, marked on 2 serial sections with both antibodies, was positive for both [beta] -amyloid and PrP106-126. Double-stained sections with [beta] -amyloid and PrP106-126 antibodies further demonstrate that 3 populations of plaques exist: only [beta] -amyloid, only PrP106-126 positive, or positive for both antibodies (Figure 1) and a majority of SPs (>50%) are immunopositive for both [beta] -amyloid and PrP106-126 antibodies. Comparatively, the relative proportion of SPs marked for each antibody alone is smaller. In particular, SPs marked for PrP106-126 represent approximately 5% to 10% of the whole population.


Comment http://jama.ama-assn.org/images/dot_lgray_999999.gif


Coexistence of Creutzfeldt-Jakob disease (CJD) and AD in some patients has been described but appears mainly related to age in patients proven to have CJD.4 However, since the individuals in the Swiss family died over a long interval and were all similarly affected, it is unlikely that CJD is purely coincidental. On the other hand, familial Gerstmann-Straüssler-Scheinker disease can present a variant with concomitant neurofibrillary tangle and prion-positive plaques, but not [beta] -amyloid-positive plaques. Within this variant, 2 mutations in the gene for the PrP have been identified in 2 different families, and the clinical profile with cerebellar ataxia and extrapyramidal signs5 differs from our findings.2 Base pair deletion in the prion gene segregating as an uncommon polymorphism has been described in a family with a history of late-onset AD, but there is no neuropathological confirmation and the genetic association is uncertain.6

Thus, the data presented herein support the existence of a possible new subtype of familial early-onset AD with a concomitant [beta] -amyloid and prion brain pathology, together with a massive neurofibrillary tangle degeneration. Although all known mutations have been excluded in the coding regions of the AD genes, numerous candidate chromosome sites, either in the AD genes outside the coding regions or in other genes including PrP, must be considered.


G. Leuba, PhD, PD K. Saini, PhD University Psychogeriatrics Hospital Lausanne-Prilly, Switzerland

A. Savioz, PhD Y. Charnay, PhD University of Geneva School of Medicine Geneva, Switzerland


1. Cruts M, Van Broekhoven C. Molecular genetics of Alzheimer's diease. Ann Med. 1998;6:560-565.

2. Savioz A, Leuba G, Forsell C, et al. No detected mutations in the genes for the amyloid precursor protein and presenilins 1 and 2 in a Swiss early-onset Alzheimer's disease family with a dominant mode of inheritance. Dement Geriatr Cogn Disord. 1999;10:431-436. MEDLINE

3. Boris N, Mestre-Frances N, Charnay Y, Tagliavini F. Spontaneous spongiform encephalopathy in a young adult rhesus monkey. Lancet. 1996;348:55. MEDLINE

4. Hainfellner JA, Wanschitz J, Jellinger K, Liberski PP, Gullotta F, Budka H. Coexistence of Alzheimer-type neuropathology in Creutzfeldt-Jakob disease. Acta Neuropathol (Berl). 1998;96:116-122. MEDLINE

5. Ghetti B, Tagliavini F, Giaccone G, et al. Familial Gerstmann-Straüssler-Scheinker disease with neurofibrillary tangles. Mol Neurobiol. 1994;8:41-48. MEDLINE

6. Perry RT, Go RCP, Harrell LE, Acton RT. SSCP analysis and sequencing of the human prion protein gene (PRNP) detects two different 24 bp deletions in an atypical Alzheimer's disease family. Am J Med Genet. 1995;60:12-18. MEDLINE


Funding/Support: This study was supported by grants 3100-045960.95 and 3100-043573.95 from the Swiss National Science Foundation.

http://jama.ama-assn.org/issues/v283n13/ffull/jlt0405-5.html


Slide show

... Many neurodegenerative disorders -- such as prion diseases, Parkinson's disease, Huntington's disease, Alzheimer's disease, frontotemporal dementia -- are ...

www.nature.com/nrm/journal/v1/n3/slideshow/nrm1200_217a_F1.html

Occasional PrP plaques are seen in cases of Alzheimer's Disease

snip...

full text;

http://www.bseinquiry.gov.uk/files/ws/s310.pdf

2 3 Once isolated, the agent must be capable of reproducing the disease in experimental animals. 4 The agent must be recovered from the experimental disease produced. 3. In the case of transmissible spongiform encephalopathies (TSEs), these postulates are not fulfilled in the following ways: 4. Unfulfillments of Postulate 1. 4.1 Transgenic mice with a codon 102 mutation involving a leucine substitution spontaneously develop spongiform encephalopathy with no detectable mutant prion protein (PrPsc). (Ref. Hsiao K.K. et al. Spontaneous neurodegeneration in transgenic mice with mutant prion protein. Science (1990) 250: 1587-1590.) (J/S/250/1587) 4.2 Spongiform encephalopathy in zitter rats does not involved PrP. (ref. Gomi H. et al. Prion protein (PrP) is not involved in the pathogenesis of spongiform encephalopathy in zitter rats. Neurosci. Lett (1994) 166: 171-174.) (J/NSC/166/171) 4.3 Many viruses and retroviruses can produced spongiform encephalopathies without PrPsc involvement. (Ref. Wiley C.A. Gardner M. The pathogenesis of murine retroviral infection of the central nervous system. Brain Path (1993) 3: 123-128.) (J/BRP/3/123) 4.4 Experiments involving the transmission of the 'BSE agent' in mice produced symptoms of TSE, but in 55% no PrPsc could be detected. (Ref. Lasmesaz. C. et al. Transmission of the BSE agent to mice in the absence of detectable abnormal prion protein. Science (1997) 275: 402- 405.) (J/S/275/402) 5. Unfulfillment of Postulate 2 5.1 Occasional PrP plaques are seen in cases of Alzheimer's Disease, where they coexist with the more usual beta amyloid plaques. (Ref. Baker H. F. Ridley R.M. Duchen L.W. Crow T.J. Bruton C.J. Induction of beta

full text;

http://www.bse.org.uk/files/ws/s310.pdf


Wednesday, 23 August, 2000, 23:54 GMT 00:54 UK Alzheimer's and CJD 'similar' [Brain] Rogue proteins are thought to cause degenerative brain disorders Scientists have discovered striking similarities between Alzheimer's disease and the human form of mad cow disease, vCJD.

They believe the breakthrough could lead to drugs to treat both conditions.

Both are marked by a gradual and ultimately fatal deterioration of the brain and both are associated with rogue proteins.

Now Professor Chi Ming Yang, of Nankai University in Tianjin, China, has discovered that these proteins have very similar structures.

This could mean that the molecular mechanism underlying Alzheimer's disease and vCJD is the same.

Professor Yang used a computer model to map the prion protein associated with vCJD and the amyloid precursor protein associated with early stage Alzheimer's.

He found that the two proteins had a similar pattern of component parts known as amino acids.

Each are made up of a reductive amino acid followed by three non-reductive amino acids.

Reductive amino acids are more prone to damage by free radicals - charged oxygen particles that can disrupt the DNA of the body's cells.

Normally, the body can clear itself of free radicals. But with age, this system may fail.

When enough free radicals accumulate to damage a protein molecule it can malfunction.

Scientists believe this mechanism may lead to Alzheimer's, the most common cause of dementia, affecting an estimated 12 million people worldwide.

The disease is characterised by include messy "tangles" of nerve fibres and "plaques" rich in the amyloid proteins.

CJD is the human version of bovine spongiform encephalitis (BSE or mad cow disease).

It occurs naturally in about one in a million people but a new version, vCJD, has been linked with eating BSE-infected meat.

BSE and vCJD are believed to be caused by prion proteins that do not fold normally.

http://news.bbc.co.uk/hi/english/health/newsid_892000/892819.stm


Stanley Prusiner, M.D.

Stanley Prusiner, M.D., a neurobiologist at the University of California at San Francisco, was awarded the 1997 Nobel Prize in Medicine for his groundbreaking discovery and definition of a new class of disease-causing agents called prions (pronounced pree-ons). The Nobel Prize, is the most prestigious award given for research in medicine.

Dr. Prusiner's award is the culmination of 25 years of sometimes controversial research on the prion, a natural human protein that, under certain conditions, can interact with other prion proteins, ultimately forming harmful deposits in the brain. The American Health Assistance Foundation (AHAF) has awarded more than $1.2 million in research grants through its Alzheimer's Disease Research program to Dr. Prusiner to develop his prion theory as a model for Alzheimer's disease. According to AHAF President Eugene Michaels, "Dr. Prusiner has proven that the most promising discoveries are often the result of innovative scientific inquiry. We are honored to have played a part in Dr. Prusiner's groundbreaking research."

Prions have been implicated in dementia-causing diseases such as mad cow disease and scrapie in animals, and Creutzfeldt-Jakob Disease (CJD) and Gerstmann-Straussler-Scheinker syndrome (GSS) in humans. Unlike infectious agents such as bacteria, viruses and parasites, whose ability to grow and reproduce is governed by genetic material made up of RNA and DNA, prions appear to be made up entirely of proteins with no accompanying DNA or RNA. Prions are present in normal cells, and the gene that codes for the production of the prion protein is part of a normal human chromosome.

Since 1985, the American Health Assistance Foundation has supported studies of the structures and properties of prions, and investigations that led to the purification and identification of the prion protein in the brains of scrapie-infected sheep. AHAF also awarded a grant to Dr. Prusiner to study CJD and GSS, using molecular biology methods to introduce genes from mutated prion proteins into mice to create an animal model for these diseases. His current AHAF grant is focused on the development of a new system to determine when in the life of a mouse the prion protein leads to disease. He is also studying a method to prevent prion disease by blocking prions from converting normal proteins into more prions.

There are similarities between the loss of brain function in prion diseases and in Alzheimer's disease, and an understanding of how prion diseases begin and develop will add to our understanding of what happens to the brain in Alzheimer's disease. Dr. Prusiner's research may one day lead to a treatment and a cure for Alzheimer's.

http://www.ahaf.org/alzdis/about/prusiner.htm


Date: Posted 8/24/2000

"Strikingly Similar" Protein May Be In Alzheimer's And Mad Cow Disease Washington D.C., August 23 -- A "striking similarity" between proteins involved in the early stages of Alzheimer's disease and mad cow disease was described here today at the 220th national meeting of the American Chemical Society, the world's largest scientific society. The theory, if verified by other researchers, could help focus efforts to develop preventive drugs, according to the study's lead researcher, Chi Ming Yang, Ph.D., a professor of chemistry at Nankai University in Tianjin, China.

Prion diseases -- which include, among others, neurodegenerative diseases such as mad cow disease and its human counterpart, Creutzfeldt-Jakob disease -- are caused by a malfunctioning prion protein. In Alzheimer's disease, another neurodegenerative disease, the amyloid precursor protein has been implicated.

Using computer modeling, Yang discovered a similar pattern of amino acids in the prion protein and the amyloid precursor protein: a reductive amino acid followed by three non-reductive amino acids.

"This suggests a common molecular mechanism underlying the initiation stages of sporadic Alzheimer's disease and both sporadic and genetic prion diseases," says Yang.

Reductive amino acids are more prone to damage by oxygen-containing free radicals (molecules with a highly reactive unpaired electron) than other amino acids, explained Yang. Normally, the body can clear itself of free radicals. But with age, this system may fail. When enough free radicals accumulate to damage a protein molecule, it can malfunction, he says.

Proteins typically fold into specific three-dimensional structures that determine their functions. A malfunctioning protein may remain partially unfolded, which can place different amino acids in close proximity, Yang explained. In the case of Alzheimer's and prion diseases, the reductive amino acids in close proximity can lead to the formation of protein plaques, according to Yang.

Although Alzheimer's and prion diseases seem to start in similar ways, they progress differently. This may explain why Alzheimer's disease advances at a much slower pace than Creutzfeldt-Jakob disease, says Yang.

The paper on this research, PHYS 460, will be presented at 7 p.m., Wednesday, Aug. 23, in the Washington Convention Center, Exhibit Hall D.

Chi Ming Yang, Ph.D., is a chemistry professor at Nankai University, Tianjin, China.

A nonprofit organization with a membership of 161,000 chemists and chemical engineers, the American Chemical Society publishes scientific journals and databases, convenes major research conferences, and provides educational, science policy and career programs in chemistry. Its main offices are in Washington, D.C., and Columbus, Ohio.

http://www.sciencedaily.com/releases/2000/08/000824081151.htm


http://www.sciencedaily.com/releases/2000/08/000824081151.htm


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Some references that may be interesting on the topic...

References. Aguzzi, A. and Weismann, C. Prion Research: the Next Frontiers. Nature, Vol.389 pp.796-79 ,1997. Alper , T.; Cramp, W.; Haig , D. and Clarke, M. Does the agent of scrapie replicate without nucleic acid?, Nature, Vol.214, pp.764-766.1967 Aldudo, J.; Bullido, M.J; De Miguel, C.; Valdivieso, F.; and Vazquez, J. Presenilin-1 genotype[2/2] is associated with late onset Alzheimer's disease in Spanish patients. Alzheimer's Res. Vol.3, pp.141-143.1997 Avila , J. and Colaco, A.L. The role of sulphated glycosaminoglycans in Alzheimer's disease.: a hypothesis. Alzheimer's Res., Vol.3,pp.77-81.1997 Avila, J. Modification of proteins related with the onset of Alzheimer's disease: Tau phosphorilation, glycosylation and oxydation in Alzheimer's disease. Current Drugs , Vol.2,pp.141-143.1997 Baldwin , M.; James , T.; Cohen, F.; and Pruisiner , S. The three-dimensional structure of prion protein : implications for Prion disease. Biochemical Society Transactions , Vol.26, pp.481-486.1998 Baldwin, M.; Pan ,K.; Nguyen , J.; Huang, Z. Groth, D.; Serban, A. et al. Spectroscopic Characterization of conformational differences between PrPc and PrPsc-An Alpha-helix to Beta-sheet transition. Philosophical Transactions of the Royal Society of London, series B-Biological Sciences,Vol.343, number 1306, pp-435-441.1992 Ball, M. Features of Creutzfeldt-Jakobs disease in brains of patients with familial dementia of Alzheimer's type. Canadian Journal of Neurological Sc.Vol.7 , pp.51-57.1980 Banissi-Sabourdi, C.; Planques, B.; David, J.P.; Jeannin, C.; Potel , M; Bizien, M.; Di Menza, C.; Brugère -Picoux, J.; Brugère, H.; Chatelain , J. Electroanalytical characterization of Alzheimer's disease and ovine spongiform encephalopathy by repeated cyclic voltametry at a capillary graphite paste electrode .Bioelectrochemistry and Bioenergetics. Vol. 28, pp.127-147.1992 Bernouli, C.; Siegfried, J.; Baumgartner,g. et al. Danger of accidental person to person transmission of Creutzfeldt-Jakobs disease by surgery . The Lancet.Vol.1,pp.478-479.1997 Borner, C.; Oliver, r.; Martinou, I.; Mattman ,C.; Tschopp, J.; and Martinou ,J.C. Dissection of functional domains in bcl-2 alpha by site directed mutagenesis . Biochemical Cellular Biology.Vol.72, pp463-469.1994 Brandner, s.; Isenmann, S; Raeber, A.; Fischer ,M.; Sailer, A.; Koyba et al. normal host prion protein necessary for scrapie-induced neurotoxicity.Nature.Vol.379, pp.339-343.1996 Braham, J . Ceutzfeldt-Jakob Disease: treatment by Amantidine. Brit. Med . J. Vol. 4, pp.213-213.1971 Brown, P.; Cathala, F.; and Gjdusek, D.C. Creutzfeldt-Jakob disease in France III. Epidemiological study of 170 patients dying during the decade 1968-1977. Ann. Of Neur.vol.6, pp.438-446.1979 Brugère, H.; Banissi, C.; Brugère-Picoux, J.; Chatelain, J. et Buvet, R. Recherche d'un temoin biochimique urinaire de l'infection du mouton par la tremblante. Bull. Acad. Vet. de France.Vol.64, pp.139-145.1991 Brugère, H.; Banissi, C.; Brugère-Picoux ,J .;Chatelain, J.; Tournaire, M.C et Buvet, R. Electrochemical analysis of urine in Alzheimer's patients and ruminants with spongiform encephalopaties ( scrapie and BSE) .III Int. Symp. on Transmissible subacute spogiform encephalopaties: Prion diseases, Paris, Val de Grace, 18-20 March.1996 Bruce, M.; Will, r.; Ironside, J.; McConnell, I.; Dummond , D,; and Suttie, A. Transmission to mice indicates that "new variant" CJD is caused by BSE agent. Nature. Vol.389, pp.498-501.1997 Byeler, H.; Aguzzi, A.; Sailer, A.; Greiner, r.; Autenreid, P.; Aguet, M.. and Weissman, C. Mice devoid of PrP are resistant to scrapie. Cell.vol.73, pp.1339-1347.1993 Carpenter, C.; Fishl, M.; Hammer, S.M; et al . Anti-retroviral therapy for HIV infection in 1996: Recommendations of an international panel. JAMA. Vol. 276,pp.146-154.1996 Cathala, F.; Brown, P.; Rahison, S et al. Maladie de Creutzfeldt-Jakob en France. Revue Neurologique (Paris).Vol.7,pp56-62.1982 Caughey, W.; Raymond, L .; Horiuchi, M.; and Caughey, B. Inhibition of protease-resistant prion protein formation by porphyrins and phtalocyanines.PNAS.Vol.95.Iss.21,pp.12117-12122.Oct.17th,1998. Cohen, F.; Pan, K.; Huang, Z; Baldwin, M.; Fletterick, R. and Pruisiner, S. Structural clues to prion replication.Science.Vol.264, pp.530-531. 1994 Collinge, J.; and Hawke, S. B lymphocytes in prion neuroinvasion: central or peripheral players?. Nature Medicine .Vol.4,pp.1369-1370.1998. Collinge, J. and Palmer, M. Prion Diseases. Oxford University Press.1997 Collinge, J.; Whittington ,M.; Siddle, K. et al. Prion protein is necessary of synaptic formation. Nature. Vol.370, pp.277-295.1994 Cook, B.H.; Ward, B.; and Austin, J. Studies in ageing in the brain IV. Familial Alzheimer's disease : elation to transmissible dementia, aneuploidy and microtubular defects. Neur.Vol.29, pp.1402-1412.1979 De Armond, S.; Sanchez, h.; Yehiely, Q et al. Selective Neuronal targeting in prion disease.Neuron.Vol.19, pp.1337-1348.1997 De Wolfe, F.; Lukashnov, V. Danner, S et al .Clearance of HIV-1 following treatment with two, three, four or five anti-HIV drugs. Program and abstracts of the 5th conference on retroviruses and opportunistic infections.Feb.1-5th. Chicago, Ill.1998.Abs.384 Garrett, L. The Coming Plague. Penguin USA. 1995 Gibbs, T.; Baldwin, M.; Lloyd, D. et al. Predicted alpha-helical regions of the prion protein when synthesized as peptides from amyloid. PNAS.Vol.89,pp.10940-10944.1992 Goudsmith, J.; Morrow, C.; Asher, D. et al. Evidence for and against the transmissibility of Alzheimer's disease.Neurology.Vol.30pp.945-950.1980 Herishanu, Y. Antiviral drugs in Creutzfeldt-Jakob disease. J. of Am. Soc. of Geriatrics.Vol.21,pp.229-273.1973 Ikeda, K.; Kawada, N.; Wang ,Y. et al .Expression of cellular prion protein in activated hepatic stellate cells. Am. J. of Path.Vol.6,N.6, pp.1695-1700.1999 Jellinger, K.; and Seitelberger, F. Spongy degeneration in the central nervous system in infancy. Curr. Top. in Path.Vol.53, pp.90-160.1970 Kimberlin, R. and Walker , C. Anti-viral compound effective against experimental scrapie. The Lancet.Vol.2, pp.591-592.1979 Knusel, B. and Hefti ,Development of cholinergic pedunculopontine neurons in vitro: comparison with cholinergic septal cells and response to nerve growth factor, ciliary neurothrophic factor and retinoic acid. J. of Neurosc. Res. Vol.21,pp.365-375.1988 Manuelidis, E.; Manuelidis, L.; Pincus , J. et al. Transmission from man to hamster of Creutzfeldt-Jakob disease with clinical recovery. The Lancet. Vol.2.pp.40-42.1978 Munoz-Montano, J.; Moreno, F.; Avila, J. et al. Lithium inhibits Alzheimer's disease-like tau protein phosphoryllation in neurons .FEBS Lett.Vol.411,pp.183-188.1997 Perez, M.; Wandosell, F.; Colaco, C. and Avila, J. Sulphated glycosaminoglycans prevent neurotoxicity of human prion protein fragment . Pruisiner,S.Prions.PNAS.1998 Sadler, I.; Smith, D.; Sherman, M. et al .sulphated compounds attenuate Beta-amyloid toxicity by inhibiting its association with cells .Neuroreport.Vol.7,pp.49-53.1995 Sadler, I.; Hawtin, S.; Tailor, V. et al . Glucosaminoglycans and sulphated polyanions attenuate neurotoxic effects of beta-amyloid. Biochem. Soc. Trans. Vol.23,p.1065.1995 Sukhalayan,C.; Khalequz, Z.; Hoon, R.; Conforto, A.; and Rajiv, R. Sequence-Selective DNA binding drugs Mitramyacin A and Chromomyacin A3 are potent inhibitors of neuronal apoptosis induced by oxidative stress and DNA damage in cortical neurons.Ann.Neurol.Vol.49,pp.345-354.2001

Diagnosis and Reporting of Creutzfeldt-Jakob Disease T. S. Singeltary, Sr; D. E. Kraemer; R. V. Gibbons, R. C. Holman, E. D. Belay, L. B. Schonberger

http://jama.ama-assn.org/issues/v285n6/ffull/jlt0214-2.html


IN STRICT CONFIDENCE

TRANSMISSION OF ALZHEIMER-TYPE PLAQUES TO PRIMATES

http://www.bseinquiry.gov.uk/files/yb/1993/01/05004001.pdf

4.5 MILLION DEMENTED ALZHEIMER'S PATIENTS, HOW MANY ARE CJD/TSEs ???

HOW CAN ONE-IN-A-MILLION BE ACCURATE WHEN CJD IS NOT REPORTABLE,

AND WHEN THE ELDERLY DO NOT GET AUTOPSIED??????

TSS


http://www.rense.com/general34/cjmd.htm

Proof Mad Cow Is The Same As Alzheimer's And CJD
How Many Of Them Are Really Mad Cow/vCJD/TSEs ???
How Can Government Claims Of Just 'One In A Million' Be Accurate
When CJD Is Not A Reportable Disease? And When The Elderly Do
Not Get Routinely Autopsied??

By Terry Singletary, Sr
12-27-03


Note - This extensive, powerful assemblage of science was first posted on 1-24-3. The
following data is even more important today. -ed


snip...

http://www.rense.com/general46/proofa.html


Alzheimer's and Transmissible Spongiform Encephalopathies

http://neurotalk.psychcentral.com/thread13175.html


TSS




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