Erschienen in:
01.09.2009 | Original Paper
Absence of α-synuclein pathology in postencephalitic parkinsonism
verfasst von:
Kurt A. Jellinger
Erschienen in:
Acta Neuropathologica
|
Ausgabe 3/2009
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Abstract
Postencephalitic parkinsonism (PEP), a chronic complication of encephalitis lethargica, is a tauopathy characterized by multisystem neuronal loss and gliosis with widespread neurofibrillary lesions composed of both 3- and 4-repeat (3R and 4R) tau isoforms. Previous immunohistochemical studies in a small number of PEP cases demonstrated absence of Lewy bodies as well as the lack of other α-synuclein pathology, classifying PEP as a “pure” tauopathy. Neuropathologic examination of 10 brains with clinico-pathologically verified PEP confirmed widespread neurodegeneration in subcortical and brainstem areas associated with multifocal neurofibrillary pathology comprising both 3R and 4R tau. Very rare β-amyloid deposits were observed in two elderly patients, while Lewy bodies and neurites or any other α-synuclein deposits were completely absent. The causes and molecular background of total absence of α-synuclein pathology in PEP, in contrast to most other tauopathies, remain as unknown as the pathogenesis of PEP.