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Curcumin is a chemical with various pharmacological activities used for cancer treatment. It inhibits hepatocellular carcinoma (HCC) by inducing apoptosis. Here, the mechanism underlying the effect of curcumin on the apoptosis of HCC cells was studied. Cell counting kit-8 and plate cloning assays were used to assess the proliferation of HCC cells, and acridine orange/ethidium bromide and Annexin V/PI staining were used to analyze their apoptosis. HCC xenograft tumor models were established to validate anti-cancer effects of curcumin. Expression levels of XRCC4 protein in tumor tissues were assessed by immunohistochemistry. Correlation between XRCC4 expression and the prognosis of patients with HCC was analyzed by integrating publicly available gene expression data. Curcumin inhibited HCC cells proliferation in a dose-dependent manner. Compared with the control group, curcumin significantly promoted the apoptosis of HCC cells  in vitro  and  in vivo . Immunohistochemical analysis revealed that curcumin downregulated XRCC4 expression levels in HCC tissues. Prognosis of HCC patients with high XRCC4 expression was poorer than that of patients with low XRCC4 expression. Therefore, curcumin exerts anti-cancer effects by inhibiting cell proliferation and promoting cell apoptosis in HCC. This may be due to curcumin interference in the repair process of the nonhomologous DNA terminal link of HCC cells by downregulating XRCC4 expression.

Curcumin Induces Apoptosis by Suppressing XRCC4 Expression in Hepatocellular Carcinoma