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Connexin32 activates necroptosis through Src‐mediated inhibition of caspase 8 in hepatocellular carcinoma
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Connexin32 activates necroptosis through Src‐mediated inhibition of caspase 8 in hepatocellular carcinoma
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Journal Article
Connexin32 activates necroptosis through Src‐mediated inhibition of caspase 8 in hepatocellular carcinoma
2021
Overview
Necroptosis is an alternative form of programmed cell death that generally occurs under apoptosis‐deficient conditions. Our previous work showed that connexin32 (Cx32) promotes the malignant progress of hepatocellular carcinoma (HCC) by enhancing the ability of resisting apoptosis in vivo and in vitro. Whether triggering necroptosis is a promising strategy to eliminate the apoptosis‐resistant HCC cells with high Cx32 expression remains unknown. In this study, we found that Cx32 expression was positively correlated with the expression of necroptosis protein biomarkers in human HCC specimens, cell lines, and a xenograft model. Treatment with shikonin, a well‐used necroptosis inducer, markedly caused necroptosis in HCC cells. Interestingly, overexpressed Cx32 exacerbated shikonin‐induced necroptosis, but downregulation of Cx32 alleviated necroptosis in vitro and in vivo. Mechanistically, Cx32 was found to bind to Src and promote Src‐mediated caspase 8 phosphorylation and inactivation, which ultimately reduced the activated caspase 8‐mediated proteolysis of receptor‐interacting serine‐threonine protein kinase 1/3, the key molecule for necroptosis activation. In conclusion, we showed that Cx32 contributed to the activation of necroptosis in HCC cells through binding to Src and then mediating the inactivation of caspase 8. The present study suggested that necroptosis inducers could be more favorable than apoptosis inducers to eliminate HCC cells with high expression of Cx32. Connexin32 promotes shikonin‐induced necroptosis in hepatocellular carcinoma by interacting with Src and enhancing Src‐mediated caspase 8 phosphorylation on Tyr380. We identified the novel role of connexin32 in necroptosis and elucidated connexin32 as a potential target for pronecroptosis therapy in hepatocellular carcinoma.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc
Subject
/ Animals
/ Carcinoma, Hepatocellular - genetics
/ Carcinoma, Hepatocellular - metabolism
/ Carcinoma, Hepatocellular - pathology
/ Cell Proliferation - drug effects
/ Cell Proliferation - genetics
/ Hepatoma
/ Humans
/ Kinases
/ Liver Neoplasms - metabolism
/ Male
/ Mice
/ Naphthoquinones - administration & dosage
/ Nuclear Receptor Coactivator 1 - genetics
/ Nuclear Receptor Coactivator 1 - metabolism
/ Original
/ Phosphorylation - drug effects
/ Proteins
/ Shikonin
/ Signal Transduction - drug effects
/ Signal Transduction - genetics
/ Software
/ Src
