MICAL2PV suppresses the formation of tunneling nanotubes and modulates mitochondrial trafficking.

MICAL2PV suppresses the formation of tunneling nanotubes and modulates mitochondrial trafficking.
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MICAL2PV抑制隧道纳米管的形成并调节线粒体运输。

DOI:
10.15252/embr.202052006
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发表时间:
2021-07-05
期刊:
影响因子:
7.7
通讯作者:
Wu JY
Wu JY
中科院分区:
生物学2区
文献类型:
--
作者:
Wang F;Chen X;Cheng H;Song L;Liu J;Caplan S;Zhu L;Wu JY

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Tunnel nanotubes(TNT)是富含肌动蛋白的结构,连接两个或多个细胞并介导空间分离的细胞之间的货物交换。TNT运输信号分子、囊泡、细胞器,甚至病原体。然而,调节TNT形成的分子机制仍然不清楚,并且对肺癌细胞中抑制TNT形成的内源性机制知之甚少。在这里,我们报告说,MICAL 2 PV,剪接异构体的神经元引导基因MICAL 2,是一种新的TNT调节剂,抑制TNT的形成和调节线粒体分布。MICAL 2 PV与线粒体Rho GTdR Miro 2相互作用并调节亚细胞线粒体运输。此外,MICAL 2 PV的下调增强了用化疗药物处理的细胞的存活。MICAL 2 PV的单加氧酶(MO)结构域是其通过解聚F-肌动蛋白来抑制TNT形成的活性所必需的。我们的数据表明,以前未被认识到的功能MICAL 2在TNT的形成和线粒体运输。此外,我们的研究揭示了MICAL 2 PV-Miro 2轴在线粒体运输中的作用,为MICAL 2 PV抑制TNT形成和调节线粒体亚细胞分布的活性提供了机制解释。MICAL 2 PV抑制肺癌细胞中TNT形成和TNT介导的线粒体转移。MICAL 2 PV的下调促进F-肌动蛋白聚合,从而增加TNT的形成和细胞间线粒体的运动和分布。
Tunneling nanotubes (TNTs) are actin‐rich structures that connect two or more cells and mediate cargo exchange between spatially separated cells. TNTs transport signaling molecules, vesicles, organelles, and even pathogens. However, the molecular mechanisms regulating TNT formation remain unclear and little is known about the endogenous mechanisms suppressing TNT formation in lung cancer cells. Here, we report that MICAL2PV, a splicing isoform of the neuronal guidance gene MICAL2, is a novel TNT regulator that suppresses TNT formation and modulates mitochondrial distribution. MICAL2PV interacts with mitochondrial Rho GTPase Miro2 and regulates subcellular mitochondrial trafficking. Moreover, down‐regulation of MICAL2PV enhances survival of cells treated with chemotherapeutical drugs. The monooxygenase (MO) domain of MICAL2PV is required for its activity to inhibit TNT formation by depolymerizing F‐actin. Our data demonstrate a previously unrecognized function of MICAL2 in TNT formation and mitochondrial trafficking. Furthermore, our study uncovers a role of the MICAL2PV‐Miro2 axis in mitochondrial trafficking, providing a mechanistic explanation for MICAL2PV activity in suppressing TNT formation and in modulating mitochondrial subcellular distribution. MICAL2PV suppress TNT formation and TNT‐mediated mitochondrial transfer in lung cancer cells. Down‐regulation of MICAL2PV promotes F‐actin polymerization, thereby increasing TNT formation and intercellular mitochondrial movement and distribution.
DOI: 10.1182/blood.2019001398
发表时间: 2019-10-24
期刊: BLOOD
影响因子: 20.3
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