Transient assembly of F-actin on the outer mitochondrial membrane contributes to mitochondrial fission.

Transient assembly of F-actin on the outer mitochondrial membrane contributes to mitochondrial fission.
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DOI:
10.1083/jcb.201404050
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发表时间:
2015-01-05
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Karbowski M
Karbowski M
中科院分区:
其他
文献类型:
--
作者:
Li S;Xu S;Roelofs BA;Boyman L;Lederer WJ;Sesaki H;Karbowski M

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线粒体上 F-肌动蛋白的动态组装和分解参与 Drp1 介导的线粒体裂变。除了在各种细胞位置中确定的膜重塑作用之外,肌动蛋白最近还成为线粒体裂变的参与者。然而,其参与的根本机制仍然很大程度上未知。我们报告,线粒体上瞬时从头组装 F-肌动蛋白是在诱导线粒体裂变时发生的,并且 F-肌动蛋白在线粒体上积累,但没有形成可检测的软骨下病灶。通过敲除或抑制 Drp1 来损害线粒体分裂,延长了线粒体 F-肌动蛋白积累的时间,并导致肌动蛋白调节因子 cortactin、cofilin 和 Arp2/3 复合物在线粒体中异常积累,表明线粒体 F-肌动蛋白的分解取决于 Drp1 活性。此外,肌动蛋白调节蛋白的下调导致线粒体伸长,这与线粒体 Drp1 的积累有关。此外,cortactin 的消耗抑制了 Mfn2 下调或 FCCP 诱导的线粒体断裂。这些数据表明线粒体上 F-肌动蛋白的动态组装和分解参与了 Drp1 介导的线粒体裂变。
Dynamic assembly and disassembly of F-actin on mitochondria participate in Drp1-mediated mitochondrial fission. In addition to established membrane remodeling roles in various cellular locations, actin has recently emerged as a participant in mitochondrial fission. However, the underlying mechanisms of its participation remain largely unknown. We report that transient de novo F-actin assembly on the mitochondria occurs upon induction of mitochondrial fission and F-actin accumulates on the mitochondria without forming detectable submitochondrial foci. Impairing mitochondrial division through Drp1 knockout or inhibition prolonged the time of mitochondrial accumulation of F-actin and also led to abnormal mitochondrial accumulation of the actin regulatory factors cortactin, cofilin, and Arp2/3 complexes, suggesting that disassembly of mitochondrial F-actin depends on Drp1 activity. Furthermore, down-regulation of actin regulatory proteins led to elongation of mitochondria, associated with mitochondrial accumulation of Drp1. In addition, depletion of cortactin inhibited Mfn2 down-regulation– or FCCP-induced mitochondrial fragmentation. These data indicate that the dynamic assembly and disassembly of F-actin on the mitochondria participates in Drp1-mediated mitochondrial fission.
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