Over-expression of GSTP1 increases oxaliplatin-induced apoptosis in hu-man hepatoma HepG2 cells / 中国病理生理杂志

ABSTRACT

AIM: To investigate the effect of GSTP1 over-expression on the sensitivity of human hepatoma HepG2 cells to oxaliplatin (OXA).METHODS: Adenovirus carrying GSTP1 (Ad-GSTP1) was used to infect HepG2 cells for establishing the cell line over-expressing GSTP1.The cells were randomly divided into 6 groups control, vehicle, Ad-GSTP1, OXA, OXA +vehicle and OXA +Ad-GSTP1.The cell survival rates were examined by CCK-8 assay, and the apoptotic rates were analyzed by flow cytometry.The protein levels of GSTP1, Akt, mTOR, p-Akt and p-mTOR were deter-mined by Western blot.RESULTS: OXA decreased the cell survival rate in a dose-dependent manner (P <0.05).The protein expression of GSTP1 increased after transfection with adenovirus.At basal level, up-regulation of GSTP1 signifi-cantly decreased the cell survival rate, increased the cell apoptosis, and inhibited the phosphorylation levels of Akt and mTOR (P <0.05).Moreover, GSTP1 over-expression enhanced the effect of OXA on the cell viability, cell apoptosis, and further inhibited the phosphorylation levels of Akt and mTOR ( P <0.05).CONCLUSION: Over-expression of GSTP1 augments the enhanced effect of OXA on HepG2 cell apoptosis, which may be related to the inactivation of Akt/mTOR signaling pathway.