title: Abeta deposition is associated with enhanced cortical alpha-synuclein lesions in Lewy body diseases.
abstract: In order to understand better the neuropathological substrate of dementia in Parkinson's disease (PD) and to examine its interactions with Alzheimer's disease (AD), we examined autopsy brains from 21 cases of PD and Lewy body disease (LBD) with dementia. We separated brains in two groups according to the presence of Abeta deposits. In brains without Abeta, we found few or no Lewy bodies (LB) in the cerebral cortex. By contrast, in brains with Abeta, we observed significant increases in LB in the cerebral cortex (p < 0.01) and alpha-synuclein immunoreactive lesions in the cingulate cortex (p < 0.01). Immunoblots of alpha-synuclein from cingulate cortex in brains with Abeta showed significantly higher levels of insoluble alpha-synuclein compared to brains without Abeta. Our observations indicate that in cases of PD with dementia, the neocortex is not necessarily involved by LB. Furthermore, the presence of Abeta deposits in the cerebral cortex was associated with extensive alpha-synuclein lesions and higher levels of insoluble alpha-synuclein. This suggests that Abeta enhances the development of cortical alpha-synuclein lesions in cases of PD.
authors.affiliation: Department of Pathology (Neuropathology), Johns Hopkins University School of Medicine, Ross Building 558, Baltimore, MD 21205, USA.
authors.forename: Olga
authors.initials: O
authors.lastname: Pletnikova
authors.forename: Neva
authors.initials: N
authors.lastname: West
authors.forename: Michael K
authors.initials: MK
authors.lastname: Lee
authors.forename: Gay L
authors.initials: GL
authors.lastname: Rudow
authors.forename: Richard L
authors.initials: RL
authors.lastname: Skolasky
authors.forename: Ted M
authors.initials: TM
authors.lastname: Dawson
authors.forename: Laura
authors.initials: L
authors.lastname: Marsh
authors.forename: Juan C
authors.initials: JC
authors.lastname: Troncoso
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D002540:Cerebral Cortex / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D003937:Diagnosis, Differential; D005260:Female; D005561:Formates / Q000737:chemistry; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D016631:Lewy Bodies / Q000378:metabolism / Q000473:pathology; D020961:Lewy Body Disease / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D009419:Nerve Tissue Proteins / Q000378:metabolism*; D010300:Parkinson Disease / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D058225:Plaque, Amyloid / Q000378:metabolism* / Q000473:pathology; D051843:Synucleins; D051844:alpha-Synuclein; D016875:tau Proteins / Q000378:metabolism
chemical_list: D005561:Formates; D009419:Nerve Tissue Proteins; C497604:SNCA protein, human; D051843:Synucleins; D051844:alpha-Synuclein; D016875:tau Proteins; C030544:formic acid