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British Medical Bulletin 66:121-130 (2003)
© 2003 The British Council

Neuropathology of prion diseases

Herbert Budka

Austrian Reference Centre for Human Prion Diseases (ÖRPE) and Institute of Neurology, University of Vienna, Austria

In prion diseases, neuropathology has remained the most important tool to give a definite diagnosis, and neuropathological research has contributed significantly to our current pathogenetic understanding. Immunohistochemistry for the disease-associated prion protein (PrPSc) is indispensable for the neuropathological confirmation of prion diseases. The amount and distribution of PrPSc deposits do not always correlate with type and severity of local tissue damage. PrPSc deposition occurs only where neuronal parenchyma is present; in scarred infarctions with prominent gliosis, PrPSc does not accumulate. Early, severe and selective loss affects a subset of inhibitory GABAergic neurons both in human and experimental prion diseases. The central pathogenetic cascade includes oxidative stress to neurons and their apoptosis. New patterns of PrPSc immunoreactivity include granular ganglionic and tiny adaxonal PrPSc deposits in peripheral nervous tissue, and dendritic cells and macrophages in vessel walls, suggesting that mobile haematogenous cells may be involved in spread of prions.


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