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Cell Death Dis:BAG5调控Parkin依赖性线粒体自噬和细胞死亡

2019-12-11 QQY MedSci原创

由于致病性的Parkin蛋白编码基因突变会导致受损线粒体清除不完全,因此,Parkin依赖性的线粒体自噬被普遍认为参与帕金森病抵抗多巴胺能神经元的退行性变。但近期,研究发现,在促存活Bcl-2家族成员Mcl-1降解而引起的严重线粒体损伤中,Parkin蛋白会促进细胞死亡。因此研究人员推测,Parkin蛋白可能作为一个“开关”,能根据线粒体损伤的程度,调节保护性或促死亡通路之间的平衡。在本研究中,研

由于致病性的Parkin蛋白编码基因突变会导致受损线粒体清除不完全,因此,Parkin依赖性的线粒体自噬被普遍认为参与帕金森病抵抗多巴胺能神经元的退行性变。

但近期,研究发现,在促存活Bcl-2家族成员Mcl-1降解而引起的严重线粒体损伤中,Parkin蛋白会促进细胞死亡。因此研究人员推测,Parkin蛋白可能作为一个“开关”,能根据线粒体损伤的程度,调节保护性或促死亡通路之间的平衡。

在本研究中,研究人员发现与Parkin蛋白相互作用的蛋白,BAG5(Bcl-2相关抗凋亡蛋白5),通过抑制Parkin蛋白被招募到受损的线粒体上和减少受损线粒体向溶酶体运动,来削弱线粒体自噬。但在线粒体严重损伤后,BAG5还可增强Parkin蛋白介导的Mcl-1降解和细胞死亡过程。

综上所述,本研究表明BAG5可能通过抑制Parkin依赖性的线粒体吞噬、增强Parkin蛋白介导的Mcl-1降解,来调节Parkin蛋白的双模式活性,促进细胞死亡。

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    2019-12-22 维他命
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    2019-12-13 cy0328
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