Let-7 coordinately suppresses components of the amino acid sensing pathway to repress mTORC1 and induce autophagy.

Let-7 coordinately suppresses components of the amino acid sensing pathway to repress mTORC1 and induce autophagy.
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DOI:
10.1016/j.cmet.2014.09.001
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发表时间:
2014-10-07
期刊:
影响因子:
29
通讯作者:
La Spada AR
La Spada AR
中科院分区:
生物学1区
文献类型:
--
作者:
Dubinsky AN;Dastidar SG;Hsu CL;Zahra R;Djakovic SN;Duarte S;Esau CC;Spencer B;Ashe TD;Fischer KM;MacKenna DA;Sopher BL;Masliah E;Gaasterland T;Chau BN;Pereira de Almeida L;Morrison BE;La Spada AR

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Macroautophagy (hereafter autophagy) is the major pathway by which macromolecules and organelles are degraded. Autophagy is regulated by the mTOR signaling pathway – the focal point for integration of metabolic information, with mTORC1 playing a central role in balancing biosynthesis and catabolism. Of the various inputs to mTORC1, the amino acid sensing pathway is among the most potent. Based upon transcriptome analysis of neurons subjected to nutrient deprivation, we identified let-7 microRNA as capable of promoting neuronal autophagy. We found that let-7 activates autophagy by coordinately down-regulating the amino acid sensing pathway to prevent mTORC1 activation. Let-7 induced autophagy in the brain to eliminate protein aggregates, establishing its physiological relevance for in vivo autophagy modulation. Moreover, peripheral delivery of let-7 anti-miR repressed autophagy in muscle and white fat, suggesting that let-7 autophagy regulation extends beyond CNS. Hence, let-7 plays a central role in nutrient homeostasis and proteostasis regulation in higher organisms.
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