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EMM: 细胞凋亡相关蛋白BCL-B在肝纤维化消退过程中调节肝星状细胞线粒体自噬的作用

2019-01-20 MedSci MedSci原创

机体中通过细胞凋亡来清除活化的肝星状细胞(HSC)对于肝纤维化的逆转是至关重要的。线粒体稳态受线粒体自噬调节,线粒体是清除受损线粒体的有效载体,线粒体在细胞凋亡中起重要作用。然而,线粒体自噬在HSC和肝纤维化细胞凋亡中的作用仍不清楚。

    机体中通过细胞凋亡来清除活化的肝星状细胞(HSC)对于肝纤维化的逆转是至关重要的。线粒体稳态受线粒体自噬调节,线粒体是清除受损线粒体的有效载体,线粒体在细胞凋亡中起重要作用。然而,线粒体自噬在HSC和肝纤维化细胞凋亡中的作用仍不清楚。

   在这里,有研究表明,在肝纤维化逆转过程中,线粒体增加与肝星状细胞凋亡增加同时发生。抑制线粒体自噬可抑制HSCs细胞凋亡,加重小鼠肝纤维化。相反,线粒体自噬激活诱导HSC凋亡。此外,研究人员证实BCL-B(BCL-2家族的成员),是调节线粒体自噬相关细胞凋亡的调节因子。BCL-B的敲低导致HSC中细胞凋亡和线粒体自噬增加,而BCL-B的过表达导致相反的效果。BCL-B抑制Parkin(线粒体自噬的关键调节因子)的磷酸化并直接结合磷酸-Parkin。总之,增强的线粒体自噬在肝纤维化逆转期间促进HSC中的细胞凋亡。BCL-B通过结合和抑制磷酸-Parkin抑制HSC中的线粒体自噬,从而抑制细胞凋亡。BCL-B依赖性线粒体自噬是肝纤维化消退过程中调节HSCs凋亡的新途径。增强的线粒体自噬在肝纤维化逆转过程中促进HSCs的凋亡。因此本项研究表明抑制BCL-B的表达可以促进肝纤维化逆转的发生,导致良好的预后。

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    2019-11-17 gujh
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    2019-01-20 衣带渐宽

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