Mitophagy promotes replication of oncolytic Newcastle disease virus by blocking intrinsic apoptosis in lung cancer cells.

Mitophagy promotes replication of oncolytic Newcastle disease virus by blocking intrinsic apoptosis in lung cancer cells.
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线粒体自噬通过阻断肺癌细胞的内在凋亡来促进溶瘤新城疫病毒的复制

DOI:
10.18632/oncotarget.2219
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发表时间:
2014-08-15
期刊:
影响因子:
--
通讯作者:
Wei J
Wei J
中科院分区:
其他
文献类型:
--
作者:
Meng G;Xia M;Wang D;Chen A;Wang Y;Wang H;Yu D;Wei J

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细胞凋亡参与了纽卡斯尔病毒(NDV)的抗肿瘤作用。自噬是细胞在包括病毒感染在内的细胞应激下的保护性反应。自噬如何干扰NDV的溶瘤作用仍不清楚。在本研究中,我们发现NDV La Sota株在非小细胞肺癌细胞中诱导自噬并保持自噬流。NDV诱导的自噬通过阻断癌细胞的半胱天冬酶依赖性凋亡来促进病毒复制。此外,我们发现NDV募集SQSTM 1介导的线粒体自噬来控制细胞色素c的释放,从而阻断内在的促凋亡信号。最后,我们观察到在存在自噬抑制剂3-甲基腺嘌呤(3-MA)的情况下,用NDV处理的NSCLC细胞的溶瘤作用增强。有趣的是,当3-MA的给药推迟到NDV感染后24 h时,可以实现更深刻的抗肿瘤效果。我们的研究结果揭示了一种新的方式,NDV颠覆线粒体自噬有利于其复制通过阻断细胞凋亡,并提供了系统的治疗队列联合NDV与自噬抑制剂在癌症治疗的理论基础。
Apoptosis contributes to antitumor effect of Newcastle disease virus (NDV). Autophagy is a protective response under cellular stress including viral infection. How autophagy interferes with oncolysis of NDV remains unclear. In this study, we found that NDV La Sota strain induced autophagy and preserved autophagic flux in non-small cell lung cancer cells. NDV-induced autophagy promoted viral replication by blocking cancer cells from caspase-dependent apoptosis. Moreover, we found that NDV recruited SQSTM1-mediated mitophagy to control cytochrome c release, and thus blocked intrinsic pro-apoptotic signaling. Finally, we observed an enhanced oncolysis in NSCLC cells treated with NDV in the presence of an autophagy inhibitor 3-methyladenine (3-MA). Interestingly, a more profound antitumor effect could be achieved when administration of 3-MA was postponed to 24 h after NDV infection. Our findings unveil a novel way that NDV subverts mitophagy to favor its replication by blocking apoptosis, and provide rationale for systemic therapeutic cohort combining NDV with autophagy inhibitors in cancer therapy.
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