Division of Infectious Diseases and Division of Gastroenterology, Department of Medicine, University of California, San Diego, La Jolla, CA 92093.
Proc Natl Acad Sci U S A. 2014 Apr 29;111(17):6413-8. doi: 10.1073/pnas.1321114111. Epub 2014 Apr 14.
Mitochondrial dynamics is crucial for the regulation of cell homeostasis. Our recent findings suggest that hepatitis C virus (HCV) promotes Parkin-mediated elimination of damaged mitochondria (mitophagy). Here we show that HCV perturbs mitochondrial dynamics by promoting mitochondrial fission followed by mitophagy, which attenuates HCV-induced apoptosis. HCV infection stimulated expression of dynamin-related protein 1 (Drp1) and its mitochondrial receptor, mitochondrial fission factor. HCV further induced the phosphorylation of Drp1 (Ser616) and caused its subsequent translocation to the mitochondria, followed by mitophagy. Interference of HCV-induced mitochondrial fission and mitophagy by Drp1 silencing suppressed HCV secretion, with a concomitant decrease in cellular glycolysis and ATP levels, as well as enhanced innate immune signaling. More importantly, silencing Drp1 or Parkin caused significant increase in apoptotic signaling, evidenced by increased cytochrome C release from mitochondria, caspase 3 activity, and cleavage of poly(ADP-ribose) polymerase. These results suggest that HCV-induced mitochondrial fission and mitophagy serve to attenuate apoptosis and may contribute to persistent HCV infection.
线粒体动力学对于细胞内稳态的调节至关重要。我们最近的研究结果表明,丙型肝炎病毒(HCV)促进 Parkin 介导的受损线粒体(自噬)的消除。在这里,我们发现 HCV 通过促进随后的自噬的线粒体裂变来扰乱线粒体动力学,从而减轻 HCV 诱导的细胞凋亡。HCV 感染刺激了与分裂相关的蛋白 1(Drp1)及其线粒体受体,线粒体分裂因子的表达。HCV 进一步诱导 Drp1(Ser616)的磷酸化,并导致其随后向线粒体易位,随后发生自噬。通过 Drp1 沉默干扰 HCV 诱导的线粒体裂变和自噬抑制了 HCV 的分泌,同时伴随着细胞糖酵解和 ATP 水平的降低以及先天免疫信号的增强。更重要的是,沉默 Drp1 或 Parkin 会导致凋亡信号显著增加,这表现为线粒体中细胞色素 C 的释放增加、半胱天冬酶 3 的活性增加以及多聚(ADP-核糖)聚合酶的切割。这些结果表明,HCV 诱导的线粒体裂变和自噬有助于减轻细胞凋亡,并可能导致持续性 HCV 感染。
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