目的探讨芦荟大黄素抑制胃癌细胞生长与细胞周期阻滞的关系。方法人胃癌SGC-7901细胞用2.5、5、10、20、40μmol/L芦荟大黄素处理1~5 d。分别用MTT方法和流式细胞术检测细胞增殖情况和细胞周期的变化,然后用Western blotting方法检测细胞周期相关调控蛋白周期蛋白(cyclin)和周期蛋白依赖性激酶(cyclin-dependent kinase,CDK)的变化。结果芦荟大黄素以剂量依赖方法抑制胃癌细胞的生长;芦荟大黄素引起细胞阻滞在G₂/M期;其分子机制为引起cyclin A和CDK2的表达水平下降、cyclin B1和CDK1的表达水平上升。结论芦荟大黄素抑制胃癌细胞生长的机制之一是阻滞细胞周期,说明芦荟大黄素在胃癌治疗方面有潜在的临床价值。

Objective To investigate the relationship between the antiproliferation effects of aloe-emodin on growth of gastric cancer cells and cell cycle arrest.Methods Human gastric cancer SGC-7901 cells were treated with 2.5,5,10,20,and 40 μmol/L aloe-emodin for 1—5 d.The cell growth was determined by MTT assay.Cell proliferation and cycle distributions were analyzed by flow cytometry.Western blotting assay was used to detect the changes of cell cycle regulators,cyclins,and cyclin-dependent kinases(CDK).Results Aloe-emodin inhibited the growth of gastric cancer cells in a dose-dependent manner.Treatment of aloe-emodin resulted in cell cycle arresting at G2/M phase.Its molecular mechanisms involved the decrease of the expression of cyclin A and CDK2,the increase of the expression of cyclin B1 and CDK1.Conclusion One of the antitumor mechanism of aloe-emodin on the growth of gastric cancer SGC-7901 cells is to arrest the cell cycle,which indicates that aloe-emodin has a potential value for the treatment of gastric cancer in clinic.

宁波市自然科学基金资助项目(2006A610047);浙江省“151人才”工程培养项目(2003236);宁波市高校名师培养项目(2004771)