α-Synuclein impairs macroautophagy: implications for Parkinson's disease.

α-Synuclein impairs macroautophagy: implications for Parkinson's disease.
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DOI:
10.1083/jcb.201003122
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发表时间:
2010-09-20
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Rubinsztein DC
Rubinsztein DC
中科院分区:
其他
文献类型:
--
作者:
Winslow AR;Chen CW;Corrochano S;Acevedo-Arozena A;Gordon DE;Peden AA;Lichtenberg M;Menzies FM;Ravikumar B;Imarisio S;Brown S;O'Kane CJ;Rubinsztein DC

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α-Synuclein通过抑制Rab1a损害自噬体形成并错定位Atg9。帕金森氏病(PD)的病理特征是称为路易体的神经元内包涵体,主要由α-突触核蛋白组成。α-synuclein基因位点的增殖增加α-synuclein的表达,引起PD。因此,野生型α-突触核蛋白过表达具有毒性。在这项研究中,我们证明α-突触核蛋白过表达会损害哺乳动物细胞和转基因小鼠的巨噬。我们的数据表明,α-synuclein通过抑制Rab1a抑制自噬,Rab1a过表达修复α-synuclein引起的自噬缺陷。α-突触核蛋白过表达或Rab1a敲低抑制自噬可导致自噬蛋白Atg9定位错误,并减少大体形成。Rab1a, α-synuclein和Atg9都调节着标记自噬体前体的大体的形成。
α-Synuclein impairs autophagosome formation and mislocalizes Atg9 by inhibiting Rab1a. Parkinson’s disease (PD) is characterized pathologically by intraneuronal inclusions called Lewy bodies, largely comprised of α-synuclein. Multiplication of the α-synuclein gene locus increases α-synuclein expression and causes PD. Thus, overexpression of wild-type α-synuclein is toxic. In this study, we demonstrate that α-synuclein overexpression impairs macroautophagy in mammalian cells and in transgenic mice. Our data show that α-synuclein compromises autophagy via Rab1a inhibition and Rab1a overexpression rescues the autophagy defect caused by α-synuclein. Inhibition of autophagy by α-synuclein overexpression or Rab1a knockdown causes mislocalization of the autophagy protein, Atg9, and decreases omegasome formation. Rab1a, α-synuclein, and Atg9 all regulate formation of the omegasome, which marks autophagosome precursors.
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