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Aging, the brain and human prion disease
Gábor G Kovács1, Herbert Budka
1Institute of Neurology, University of Vienna, Austrian Reference Center of Human Prion Diseases, AKH 4J, P.O. Box 48, Wahringer Gurtel 18-20, 1097, Vienna, Austria.
Experimental Gerontology
|February 7, 2002
Summary
Human prion diseases (PrD) primarily affect older adults and are distinct from Alzheimer's disease. Prion protein deposition in PrD originates solely from neurons, unaffected by co-occurring age-related brain changes.
Area of Science:
- Neuropathology
- Neurodegenerative Diseases
- Aging
Background:
- Human prion diseases (PrD) predominantly affect the elderly population.
- PrD neuropathology can present alongside age-related changes like tau tangles and beta-amyloid plaques, common in Alzheimer's disease.
- Cerebrovascular disease is also prevalent in the elderly.
Purpose of the Study:
- To investigate the origin of prion protein deposition in human prion diseases.
- To differentiate PrD pathology from co-occurring age-related neuropathologies.
- To explore the role of cerebrovascular disease in understanding PrD pathogenesis.
Main Methods:
- Neuropathological examination of elderly individuals with PrD.
- Histological analysis to identify tau, beta-amyloid, and prion protein deposition.
- Correlation of prion protein deposition with cerebrovascular disease and neuronal markers.
Main Results:
- Prion disease neuropathology in the elderly frequently coexists with tau and beta-amyloid pathologies.
- These co-occurring pathologies are likely age-related changes, not directly linked to Alzheimer's disease pathogenesis.
- Prion protein deposition in PrD was confirmed to originate exclusively from neurons, even in the presence of cerebrovascular disease.
Conclusions:
- Human prion diseases in the elderly are distinct from Alzheimer's disease, despite overlapping neuropathological features.
- Age-related changes do not influence the neuronal origin of prion protein deposition in PrD.
- Cerebrovascular disease serves as a useful model to confirm the exclusive neuronal source of prion protein in PrD.
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