Alteration of autophagosomal proteins in the brain of multiple system atrophy.
Neurobiol Dis
; 49: 190-8, 2013 Jan.
Article
em En
| MEDLINE
| ID: mdl-22959883
ABSTRACT
Autophagosomal formation is an initial step for macroautophagy. Similar to the yeast autophagy-related gene 8 (ATG8), mammalian ATG8 is responsible for autophagosomal formation, and categorized into LC3 and GABARAPs/GATE-16. Recent studies have shown that impairment of the autophagy-lysosome system is associated with formation of cytoplasmic inclusions observed in various neurodegenerative disorders including Parkinson's disease (PD) and dementia with Lewy bodies (DLB). Although abnormal α-synuclein accumulation is a cardinal neuropathological feature in PD, DLB and multiple system atrophy (MSA), it is unclear whether autophagy is altered in MSA. We here demonstrated that the level of matured GABARAPs was significantly decreased in the cerebellum of MSA relative to controls, and that the higher levels of matured and lipidated LC3 were detected in detergent-insoluble fraction of MSA. Immunohistochemical analysis showed that the vast majority of glial cytoplasmic inclusions, a hallmark of MSA, were positive for LC3, whereas they were unstained or barely stained with anti-GABARAPs or anti-GATE-16 antibodies. Our data suggest that autophagy maturation is impaired through the repressed levels of autophagosomal proteins in MSA.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Autofagia
/
Encéfalo
/
Atrofia de Múltiplos Sistemas
/
Proteínas Adaptadoras de Transdução de Sinal
/
Proteínas dos Microfilamentos
/
Proteínas Associadas aos Microtúbulos
Limite:
Adult
/
Aged
/
Aged80
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article