Enhancing Radiosensitization Effect of Metformin on Hydrochloride Cervical Cancer Hela Cell Cultured In Vitro / 医药导报

ABSTRACT

Objective To investigate the enhancing radiosensitization effect of metformin on cervical cancer Hela cell and to explore its mechanism. Methods The radiosensitization effect was observed by Clone forming assay;Hela cell cycle distribution was detected by flow cytometry method;Apoptotic changes was measured by fluorescence microscope and DAPI(4', 6-diamidino-2-phenylindole) staining; The expression of vascular endothelial growth factor ( VEGF ) protein was detected by Western blotting. Results Compared with radio alone,the cell survival rate was reduced either by combination with metformin or by metformin alone(P<0.05).The cell survival rate also depended on drug by various schedules and drug concentration(P<0.05).Metformin alone or combined with radiation could arrest cell cycle in G2/M phase(P<0.01),induce cell apoptosis.The levels of protein of VEGF was decreased by metformin, radiation alone or combination( P<0.05) . Conclusion Metformin has a radiosensitization effect on Hela cell cultured in vitro, which may be related to arresting in G2/M phase, inducing cell apoptosis and down-regulating the level of VEGF protein.