Impairment of starvation-induced and constitutive autophagy in Atg7-deficient mice.

Impairment of starvation-induced and constitutive autophagy in Atg7-deficient mice.
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DOI:
10.1083/jcb.200412022
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发表时间:
2005-05-09
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Chiba T
Chiba T
中科院分区:
其他
文献类型:
--
作者:
Komatsu M;Waguri S;Ueno T;Iwata J;Murata S;Tanida I;Ezaki J;Mizushima N;Ohsumi Y;Uchiyama Y;Kominami E;Tanaka K;Chiba T

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自噬是一种膜运输机制,其将细胞质组分递送到溶酶体/液泡中以进行大量蛋白质降解。这一机制与饥饿条件下营养物质的保存以及细胞质成分的正常周转有关。异常自噬已在几种神经退行性疾病、肝炎和肌病中报道。在这里,我们产生了Atg 7的条件性敲除小鼠,Atg 7是酵母中自噬的必需基因。Atg 7对于ATG缀合系统和自噬体形成、新生儿的氨基酸供应以及小鼠中饥饿诱导的蛋白质和细胞器的大量降解是必不可少的。此外,Atg 7缺陷导致多种细胞异常,如同心膜结构和变形的线粒体的外观,和积累的泛素阳性聚集体。我们的研究结果表明,自噬在饥饿反应和蛋白质和细胞器的质量控制在静止细胞中的重要作用。
Autophagy is a membrane-trafficking mechanism that delivers cytoplasmic constituents into the lysosome/vacuole for bulk protein degradation. This mechanism is involved in the preservation of nutrients under starvation condition as well as the normal turnover of cytoplasmic component. Aberrant autophagy has been reported in several neurodegenerative disorders, hepatitis, and myopathies. Here, we generated conditional knockout mice of Atg7, an essential gene for autophagy in yeast. Atg7 was essential for ATG conjugation systems and autophagosome formation, amino acid supply in neonates, and starvation-induced bulk degradation of proteins and organelles in mice. Furthermore, Atg7 deficiency led to multiple cellular abnormalities, such as appearance of concentric membranous structure and deformed mitochondria, and accumulation of ubiquitin-positive aggregates. Our results indicate the important role of autophagy in starvation response and the quality control of proteins and organelles in quiescent cells.
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发表时间: 2001-02-19
期刊: The Journal of cell biology
影响因子: --
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