Sestrin as a feedback inhibitor of TOR that prevents age-related pathologies.

Sestrin as a feedback inhibitor of TOR that prevents age-related pathologies.
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DOI:
10.1126/science.1182228
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发表时间:
2010-03-05
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Karin M
Karin M
中科院分区:
其他
文献类型:
--
作者:
Lee JH;Budanov AV;Park EJ;Birse R;Kim TE;Perkins GA;Ocorr K;Ellisman MH;Bodmer R;Bier E;Karin M

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Sestrins是一种保守的蛋白质,在细胞内积累,暴露于应激和增强腺苷一磷酸活化蛋白激酶(AMPK)和抑制雷帕霉素靶点(TOR)的激活。我们表明,丰富的果蝇Sestrin(dSesn)增加慢性TOR激活后,通过积累的活性氧(ROS),导致激活c-Jun N-末端激酶(JNK)和转录因子FoxO(叉头盒O)。dSesn的丢失导致年龄相关的病理学,包括甘油三酯积累、线粒体功能障碍、肌肉变性和心脏功能障碍,这些都可以通过药理学激活AMPK或抑制TOR来预防。因此,dSesn似乎是TOR的负反馈调节剂,其整合代谢和应激输入并防止由慢性TOR激活引起的病理,其可能由受损线粒体、蛋白质聚集体或脂质的自噬清除减少引起。
Sestrins are conserved proteins that accumulate in cells exposed to stress and potentiate adenosine monophosphate-activated protein kinase (AMPK) and inhibit activation of target of rapamycin (TOR). We show that abundance of Drosophila Sestrin (dSesn) is increased upon chronic TOR activation through accumulation of reactive oxygen species (ROS) that cause activation of c-Jun N-terminal kinase (JNK) and transcription factor FoxO (Forkhead box O). Loss of dSesn resulted in age-associated pathologies including triglyceride accumulation, mitochondrial dysfunction, muscle degeneration and cardiac malfunction, which were prevented by pharmacological activation of AMPK or inhibition of TOR. Hence, dSesn appears to be a negative feedback regulator of TOR that integrates metabolic and stress inputs and prevents pathologies caused by chronic TOR activation, that may result from diminished autophagic clearance of damaged mitochondria, protein aggregates, or lipids.
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