胃祺饮乙醇提取物可诱导AGS细胞G2/M 期阻滞及凋亡

Objective:To evaluate the effects of the ethanol extract isolated from Weiqi Decoction(胃祺饮,WQD-EE)on AGS cell proliferation and apoptosis.Methods:By using high-performance liquid chromatography with ultraviolet detectors(HPLC-UV)assay and MTT method,the main compounds in WQD-EE and cell viability were detected.And cell cycle distributions were determined by flow cytometry with propidium iodine(PI)staining while apoptosis was detected by flow cytometry with annexin V/Pl double staining.Finally,caspase-3 activities were measured by calorimetric method and protein expression was determined by Western blotting.Results:HPLC analysis showed that naringin(35.92μg/mg),nobiletin(21.98μg/mg),neohesperidin(17.98μg/mg)and tangeretin(0.756μg/mg)may be the main compounds in WQD-EE.WQD-EE not only inhibited AGS and MCF7 cell proliferation in a dose-dependent manner,but also blocked cell cycle progression at G_2/M stage as well as inducing cell apoptosis at concentrations triggering significant inhibition of proliferation and cell cycle arrest in AGS cells.While at 0.5 mg/mL,WQD-EE significantly increased caspase-3 activity by 2.75 and 7.47 times at 24 h and 48 h,respectively.Moreover,WQD-EE in one hand reduced protein expressions of p53 and cyclin B1,and in other hand enhanced protein expressions of cytochrome c and Bax.Protein levels of Bcl-2,Fas L and Fas were not significantly affected by WQD-EE.Conclusions:WQD-EE inhibits AGS cell proliferation through G_2/M arrest due to down-regulation of cyclin Bi protein expression,and promotes apoptosis by caspase-3 and mitochondria-dependent pathways,but not by p53-dependent pathway.