粒体自噬
线粒体
细胞生物学
癌变
自噬
癌症研究
炎症体
细胞凋亡
炎症
生物
免疫学
癌症
生物化学
遗传学
作者
Wenhui Li,Yanjun Li,Sami Siraj,Haojie Jin,Yuyuan Fan,Xin‐Rong Yang,Xiaowu Huang,Xiaohui Wang,Jun Wang,Lei Liu,Lei Du,Quan Chen
出处
期刊:Hepatology
[Wiley]
日期:2019-01-07
卷期号:69 (2): 604-621
被引量:131
摘要
Mitochondria lie at the heart of innate immunity, and aberrant mitochondrial activity contributes to immune activation and chronic inflammatory diseases, including liver cancers. Mitophagy is a selective process for removing dysfunctional mitochondria. The link between mitophagy and inflammation in tumorigenesis remains largely unexplored. We observed that FUN14 domain-containing 1 (FUNDC1), a previously characterized mitophagy receptor, accumulates in most human hepatocellular carcinomas (HCCs), and we thus explored the role of FUNDC1-mediated mitophagy in HCC initiation and progression in a mouse model in which HCC is induced by the chemical carcinogen, diethylnitrosamine (DEN). We showed that specific knockout of FUNDC1 in hepatocytes promotes the initiation and progression of DEN-induced HCC, whereas FUNDC1 transgenic hepatocytes protect against development of HCC. Hepatocyte-specific FUNDC1 ablation results in the accumulation of dysfunctional mitochondria and triggers a cascade of events involving inflammasome activation and hyperactivation of Janus kinase/signal transducer and activator of transcription signaling. Specifically, cytosolic mitochondrial DNA (mtDNA) release and caspase-1 activation are increased in FUNDC1-depleted hepatocytes. This subsequently results in the elevated release of proinflammatory cytokines, such as interleukin-1β (IL1β) and hyperproliferation of hepatocytes. Conclusion: Our results suggest that FUNDC1 suppresses HCC initiation by reducing inflammasome activation and inflammatory responses in hepatocytes, whereas up-regulation of FUNDC1 expression at the late stage of tumor development may benefit tumor growth. Our study thus describes a mechanistic link between mitophagic modulation of inflammatory response and tumorigenesis, and further implies that FUNDC1-mediated mitophagy and its related inflammatory response may represent a therapeutic target for liver cancer.
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