title: Age-induced reduction of autophagy-related gene expression is associated with onset of Alzheimer's disease.
abstract: Aging is a major risk factor for Alzheimer's disease (AD). Aggregation of amyloid beta (Aβ) in cerebral cortex and hippocampus is a hallmark of AD. Many factors have been identified as causative elements for onset and progression of AD; for instance, tau seems to mediate the neuronal toxicity of Aβ, and downregulation of macroautophagy (autophagy) is thought to be a causative element of AD pathology. Expression of autophagy-related genes is reduced with age, which leads to increases in oxidative stress and aberrant protein accumulation. In this study, we found that expression of the autophagy-related genes atg1, atg8a, and atg18 in Drosophila melanogaster was regulated with aging as well as their own activities. In addition, the level of atg18 was maintained by dfoxo (foxo) and dsir2 (sir2) activities in concert with aging. These results indicate that some autophagy-related gene expression is regulated by foxo/sir2-mediated aging processes. We further found that reduced autophagy activity correlated with late-onset neuronal dysfunction caused by neuronal induction of Aβ. These data support the idea that age-related dysfunction of autophagy is a causative element in onset and progression of AD.
authors: Department of Occupational and Environmental Health, Graduate School of Medicine, Nagoya University Nagoya, Aichi, Japan.
authors: Yasuhiro
authors: Y
authors: Omata
authors: Animal Models of Aging, CAMD, National Center for Geriatrics and Gerontology Obu, Aichi, Japan.
authors: Young-Mi
authors: YM
authors: Lim
authors: United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University Gifu City, Gifu, Japan.
authors: Yukihiro
authors: Y
authors: Akao
authors: Animal Models of Aging, CAMD, National Center for Geriatrics and Gerontology Obu, Aichi, Japan.
authors: Leo
authors: L
authors: Tsuda
keywords: Aging; Alzheimer’s disease (AD); Drosophila melanogaster; amyloid beta (Aβ); macroautophagy; neurodegeneration
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