Résumé
Objective: To explore the effect of activation of peroxisome proliferator-activated receptor gamma (PPARγ) on cell cycle arrest of gastric carcinoma cell line MGC803. Methods: The inhibitory effect of pioglitazone (PGZ) on proliferation of MGC803 cells was analyzed by MTT assay. Cell cycle were detected by flow cytometry (FCM). The protein expression of PPARγ, cyclinD1 and cell cycle protein-dependent kinase CDK4 in MGC803 cells was determined by reverse transcriptase-polymerase chain reaction (RT-PCR). Results: Treatment with 0.1-10 μmol/L, PGZ for 96 h significantly inhibited cell proliferation. The proportion of MGC803 cells at G1 phase was significantly increased when treated with 10 μmol/L PGZ for 48, 72 and 96 h, and showed an apparent G1 phase arrest. The expression of PPARγ was at a low level in MGC803 cells and significantly up-regulated when treated with 10 μmol/L, PGZ for 48 h (P < 0.01). The expression of CDK4 in MGC803 cells was significantly down-regulated when treated with 10 μmol/L, PGZ for 96 h (P < 0.01) and the expression of cyclinD1 was slightly down-regulated. Conclusion: Activation of PPARγ significantly induces G1 phase arrest, which is associated with down-regulation of the expression of CDK4 and cyclinD1.