Suppressor of cytokine signaling 6 (SOCS6) promotes mitochondrial fission via regulating DRP1 translocation.

Suppressor of cytokine signaling 6 (SOCS6) promotes mitochondrial fission via regulating DRP1 translocation.
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DOI:
10.1038/cdd.2012.106
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发表时间:
2013-01
影响因子:
12.4
通讯作者:
--
中科院分区:
生物学1区
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--
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线粒体是高度能动的细胞器,不断进行分裂和融合。线粒体动力学的损伤与线粒体功能障碍相关,并且经常与神经退行性疾病和癌症的发病机制相关。我们之前已经证明细胞因子信号传导抑制因子6(SOCS 6)基因的双等位基因失活是人类胃癌中的常见事件。在这项研究中,我们使用基于慢病毒的敲减方法概括了SOCS6丢失事件,并证明了SOCS6缺失和程序性细胞死亡抑制之间的联系。SOCS6促进内在凋亡,增加Bax构象变化,线粒体靶向和寡聚化。最重要的是,SOCS6靶向线粒体,并通过增加DRP1裂变活性介导线粒体片段化。在这里,我们发现SOCS6与DRP1和线粒体磷酸酶PGAM5形成复合物,减弱DRP1磷酸化,并促进DRP1线粒体易位。基于突变分析,SOCS6介导的细胞凋亡与其诱导线粒体分裂的能力紧密相关。这项研究证明了SOCS6在调节线粒体动力学和细胞凋亡中的重要作用。
Mitochondria are highly motile organelles that constantly undergo fission and fusion. Impairment of mitochondrial dynamics is associated with mitochondrial dysfunction and is frequently linked to the pathogenesis of neurodegenerative diseases and cancer. We have previously shown that biallelic inactivation of the suppressor of cytokine signaling 6 (SOCS6) gene is a frequent event in human gastric cancer. In this study, we recapitulated the event of SOCS6 loss using a Lentivirus-based knockdown approach, and demonstrated the linkage between SOCS6 depletion and the suppression of programmed cell death. SOCS6 promotes intrinsic apoptosis, with increased Bax conformational change, mitochondrial targeting, and oligomerization. Most importantly, SOCS6 is targeted to mitochondria and induces mitochondrial fragmentation mediated through an increase in DRP1 fission activity. Here, we show that SOCS6 forms complex with DRP1 and the mitochondrial phosphatase PGAM5, attenuates DRP1 phosphorylation, and promotes DRP1 mitochondrial translocation. Based on mutation analyses, SOCS6-mediated apoptosis is tightly coupled to its ability to induce mitochondrial fission. This study demonstrates an important role for SOCS6 in modulating mitochondrial dynamics and apoptosis.
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