Signaling networks converge on TORC1-SREBP activity to promote endoplasmic reticulum homeostasis.

Signaling networks converge on TORC1-SREBP activity to promote endoplasmic reticulum homeostasis.
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信号网络汇聚于TORC 1-SREBP活性以促进内质网稳态。

DOI:
10.1371/journal.pone.0101164
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Bakal C
Bakal C
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Sanchez-Alvarez M;Finger F;Arias-Garcia Mdel M;Bousgouni V;Pascual-Vargas P;Bakal C

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内质网(ER)的功能和容量由多个过程决定,从肽翻译、易位和折叠的局部调节到脂质组成的全局变化。因此,ER稳态需要许多细胞成分之间的复杂相互作用。然而,迄今为止,描述在细胞行为变化和环境波动期间维持ER功能的网络已被证明是困难的。在这里,我们进行了ER稳态的系统水平的分析,发现虽然调节ER功能的信号网络具有很大程度上的模块化架构,TORC 1-SREBP信号轴是一个中心节点,它整合了来自不同子网络的信号。TORC 1-SREBP通过调节磷脂的生物合成和驱动内质网形态的变化来促进内质网的稳态。特别地,我们的网络模型显示TORC 1-SREBP用于整合促进生长和G1-S进展的信号,以在细胞增殖期间维持ER功能。
The function and capacity of the endoplasmic reticulum (ER) is determined by multiple processes ranging from the local regulation of peptide translation, translocation, and folding, to global changes in lipid composition. ER homeostasis thus requires complex interactions amongst numerous cellular components. However, describing the networks that maintain ER function during changes in cell behavior and environmental fluctuations has, to date, proven difficult. Here we perform a systems-level analysis of ER homeostasis, and find that although signaling networks that regulate ER function have a largely modular architecture, the TORC1-SREBP signaling axis is a central node that integrates signals emanating from different sub-networks. TORC1-SREBP promotes ER homeostasis by regulating phospholipid biosynthesis and driving changes in ER morphology. In particular, our network model shows TORC1-SREBP serves to integrate signals promoting growth and G1-S progression in order to maintain ER function during cell proliferation.
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