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Gene therapy has emerged as a novel therapeutic approach for the treatment of cancer. In order to establish a more effective therapeutic strategy against unresectable hepatocellular carcinoma (HCC), we evaluated, in the present study, the effects of combined treatment with adenoviral vector Ad5/F35-mediated APE1 siRNA (Ad5/F35-siAPE1) and adenoviral-mediated p53 gene transfer (Ad-p53) in hepatoma cells in vitro and in vivo. Infection of SMMC-7721 cells with Ad5/F35-siAPE1 resulted in a time- and dose-dependent decrease of APE1 protein, while Ad-p53 treatment led to a time- and dose-dependent increase of p53 protein expression. Ad5/F35-siAPE1 significantly enhanced the cytotoxic effect of SMMC-7721 cells to Ad-p53 in cell survival assays, associated with increased cell apoptosis. Moreover, administration of Ad5/F35-siAPE1 and Ad-p53 into nude mice resulted in tumor growth inhibition and apoptosis induction in SMMC-7721 xenografts compared to administration of either agent alone. These results suggest that combination of Ad5/F35-siAPE1 and Ad-p53 could be a promising gene therapeutic approach against human HCC.

oncology reports

Combined use of adenoviral vector Ad5/F35-mediated APE1 siRNA enhances the therapeutic efficacy of adenoviral-mediated p53 gene transfer in hepatoma cells in vitro and in vivo