title: Synaptophysin and chromogranin A immunoreactivities of Lewy bodies in Parkinson's disease brains.
abstract: Lewy bodies commonly observed in brains with Parkinson's disease (PD) histochemically contain both protein and lipid as chemical components. Ultrastructurally, they are composed of filamentous, vesicular and granular structures. We investigated PD brains with light and electron microscopic immunohistochemistry using antibodies against two marker proteins for neuronal secretory vesicles, synaptophysin and chromogranin A. Both antibodies immunolabeled the peripheral zones and occasionally central cores of Lewy bodies of the classical and intraneuritic types. In addition, the diffuse immunolabeling was observed in Lewy bodies of the cortical type. Furthermore, the ultrastructural immuno-decoration was found mainly in the vesicular structures, and also in the filamentous and granular structures of Lewy bodies. Immuno-blot analysis of each antibody showed no difference between PD and normal control brains. The present observations suggest that vesicular profiles of Lewy bodies represent presynaptic and dense core secretory vesicles, and therefore that the lipid elements of Lewy bodies are derived from membrane lipids of these vesicles.
authors.affiliation: Department of Neurology, Faculty of Medicine, Kyoto University, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Nishimura
authors.forename: H
authors.initials: H
authors.lastname: Tomimoto
authors.forename: T
authors.initials: T
authors.lastname: Suenaga
authors.forename: S
authors.initials: S
authors.lastname: Nakamura
authors.forename: Y
authors.initials: Y
authors.lastname: Namba
authors.forename: K
authors.initials: K
authors.lastname: Ikeda
authors.forename: I
authors.initials: I
authors.lastname: Akiguchi
authors.forename: J
authors.initials: J
authors.lastname: Kimura
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000150:complications / Q000378:metabolism / Q000473:pathology; D001921:Brain / Q000378:metabolism*; D053379:Chromogranin A; D002864:Chromogranins / Q000378:metabolism*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D016631:Lewy Bodies / Q000378:metabolism*; D008854:Microscopy, Electron; D010300:Parkinson Disease / Q000150:complications / Q000378:metabolism* / Q000473:pathology; D012016:Reference Values; D016708:Synaptophysin / Q000378:metabolism*
chemical_list: C506150:CHGA protein, human; D053379:Chromogranin A; D002864:Chromogranins; D016708:Synaptophysin