mTORC1 senses stresses: Coupling stress to proteostasis.

mTORC1 senses stresses: Coupling stress to proteostasis.
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DOI:
10.1002/bies.201600268
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发表时间:
2017-05
期刊:
BioEssays : news and reviews in molecular, cellular and developmental biology
影响因子:
--
通讯作者:
Dai C
Dai C
中科院分区:
其他
文献类型:
--
作者:
Su KH;Dai C

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除了蛋白质合成和自噬,新出现的证据表明mTORC 1也参与调节蛋白质折叠和蛋白酶体降解,突出了其在细胞蛋白质组稳态或蛋白质稳态中的重要作用。除了生长信号外,mTORC 1还能感知并响应各种应激,包括能量/代谢应激、遗传毒性应激、氧化应激、渗透应激、ER应激、蛋白毒性应激和心理应激。虽然生长信号一致刺激mTORC 1,但应力对mTORC 1产生复杂的影响,其中大部分是抑制性的。mTORC 1抑制作为一种通用的适应性策略,使细胞在各种应激条件下存活。在这篇文章中,我们提供了一个新的mTORC 1在蛋白质稳定的作用,不同的分子机制,通过mTORC 1反应不同的压力,和计划利用癌细胞规避压力诱导的mTORC 1抑制的概述。因此,作为一个压力传感器,mTORC 1密切耦合应力细胞蛋白质稳态。
Beyond protein synthesis and autophagy, emerging evidence has implicated mTORC1 in regulating protein folding and proteasomal degradation as well, highlighting its prominent role in cellular proteome homeostasis or proteostasis. In addition to growth signals, mTORC1 senses and responds to a wide array of stresses, including energetic/metabolic stress, genotoxic stress, oxidative stress, osmotic stress, ER stress, proteotoxic stress, and psychological stress. Whereas growth signals unanimously stimulate mTORC1, stresses exert complex impacts on mTORC1, most of which are repressive. mTORC1 suppression, as a generic adaptive strategy, empowers cell survival under various stressful conditions. In this essay, we provide an overview of the emerging role of mTORC1 in proteostasis, the distinct molecular mechanisms through which mTORC1 reacts to diverse stresses, and the schemes exploited by cancer cells to circumvent stress-induced mTORC1 suppression. Hence, acting as a stress sensor, mTORC1 intimately couples stresses to cellular proteostasis.
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