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The present study aimed to evaluate the effects of amentoflavone on sorafenib-induced apoptosis in sorafenib-resistant hepatocellular carcinoma (HCC) cells. The sorafenib-resistant SK-Hep1 (SK-Hep1R) cell line was established for the present study. Initially, the differences in sorafenib-induced cytotoxicity and apoptosis between wild-type SK-Hep1 and SK-Hep1R cells were verified using the MTT assay and flow cytometry. The effects of amentoflavone on sorafenib-induced cytotoxicity and apoptosis were then investigated using MTT, flow cytometry, DNA gel electrophoresis and western blot analysis. The results demonstrated that cell viability of SK-Hep1R cells was increased compared with that of SK-Hep1 cells following treatment with different concentrations of sorafenib for 24 h. Apoptosis of SK-Hep1R cells was lower than that of SK-Hep1 cells following treatment with 20 µM sorafenib for 24 h. Amentoflavone alone did not inhibit cell viability but significantly triggered sorafenib-induced cytotoxicity and apoptosis in SK-Hep1R cells. Amentoflavone not only reversed sorafenib-induced anti-apoptotic protein levels but also enhanced sorafenib-induced pro-apoptotic protein expression in SK-Hep1R cells. In conclusion, amentoflavone may be used as a sorafenib sensitizer to enhance sorafenib-induced cytotoxicity and trigger sorafenib-induced apoptosis through extrinsic and intrinsic pathways in SK-Hep1R cells.

oncology letters

Amentoflavone enhances sorafenib-induced apoptosis through extrinsic and intrinsic pathways in sorafenib-resistant hepatocellular carcinoma SK-Hep1 cells in vitro