Eukaryotic initiation factor 6 regulates mechanical responses in endothelial cells.

Eukaryotic initiation factor 6 regulates mechanical responses in endothelial cells.
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DOI:
10.1083/jcb.202005213
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发表时间:
2022-02-07
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Tzima E
Tzima E
中科院分区:
其他
文献类型:
--
作者:
Keen AN;Payne LA;Mehta V;Rice A;Simpson LJ;Pang KL;Del Rio Hernandez A;Reader JS;Tzima E

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Keen等人发现了eIF 6的新作用,eIF 6是一种经典的蛋白质,以其在蛋白质合成、机械转导和细胞对力的反应中的作用而闻名。这些数据提供了一个新的范例,细胞骨架和翻译机是如何连接。蛋白质合成装置的组成部分的翻译外功能正在扩展到包括关键细胞信号网络的控制。然而,很少有人知道的非典型功能的成员的蛋白质合成机制,在调节细胞力学。我们证明了真核起始因子6(eIF 6)调节细胞机械生物学。eIF 6耗尽的内皮细胞,在基础条件下,表现出不变的新生蛋白质合成,多核糖体的配置文件,和细胞骨架蛋白的表达,与核糖体生物合成的影响最小。相比之下,使用牵引力和原子力显微镜,我们表明,损失eIF 6导致刚度和力的产生减少伴随着细胞骨架和粘着斑缺陷。从机制上讲,我们表明eIF 6是通过稳定eIF 6-RACK 1-ERK 1/2-FAK机械复合物来正确激活ERK 1/2所必需的,这对于力诱导的重塑是必要的。这些结果揭示了eIF 6的extratranslational功能和一个新的范式如何mechanotransduction,细胞骨架和蛋白质翻译成分的联系。
Keen et al. discover a new role for eIF6, a protein classically known for its role in protein synthesis, in mechanotransduction, and the cellular response to force. These data provide a novel paradigm for how the cytoskeletal and translational machineries are linked. The repertoire of extratranslational functions of components of the protein synthesis apparatus is expanding to include control of key cell signaling networks. However, very little is known about noncanonical functions of members of the protein synthesis machinery in regulating cellular mechanics. We demonstrate that the eukaryotic initiation factor 6 (eIF6) modulates cellular mechanobiology. eIF6-depleted endothelial cells, under basal conditions, exhibit unchanged nascent protein synthesis, polysome profiles, and cytoskeleton protein expression, with minimal effects on ribosomal biogenesis. In contrast, using traction force and atomic force microscopy, we show that loss of eIF6 leads to reduced stiffness and force generation accompanied by cytoskeletal and focal adhesion defects. Mechanistically, we show that eIF6 is required for the correct spatial mechanoactivation of ERK1/2 via stabilization of an eIF6–RACK1–ERK1/2–FAK mechanocomplex, which is necessary for force-induced remodeling. These results reveal an extratranslational function for eIF6 and a novel paradigm for how mechanotransduction, the cellular cytoskeleton, and protein translation constituents are linked.
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