【摘要】 目的:二甲双胍具有体外抑制肿瘤细胞生长的作用,但是对于多发性骨髓瘤细胞生长的影响和作用机制尚未可知。本研究探讨二甲双胍对人骨髓瘤细胞株U266的生长抑制作用及其可能的机制。方法:将不同浓度的二甲双胍作用于骨髓瘤细胞,采用MTT法检测细胞增殖抑制率、PI单染检测细胞周期。Western blot检测BCL-2蛋白家族蛋白表达水平的变化以及细胞色素C的释放。结果:二甲双胍可抑制U266细胞增殖,且抑制率呈时间和浓度依赖性变化;与对照组相比,二甲双胍作用48 h,细胞阻滞于G₁/G₀期;BCL-2、BCL-XL的蛋白表达水平降低、而BAX的蛋白表达水平明显升高;细胞色素C从线粒体释放到细胞质中的量增加,PARP的蛋白质剪切明显增强。结论:二甲双胍能够抑制U266细胞增殖及诱导细胞凋亡,线粒体凋亡途径可能是二甲双胍诱导细胞凋亡的机制之一。更多还原

【Abstract】 Objective: Metformin（ Met） can inhibit the proliferation of tumor cells in vitro, its effects on multiple myeloma and action mechanisms have been not yet understood. The purpose of this study was to investigate the effect and molecular mechanism of metformin on human myeloma cells U266. Methods: U266 cells were treated with different concentration of Met, the MTT was used to detect cell proliferation, the PI staining was used to detect the cell cycle, and the protein expression of BCL-2 family and the release of cytochrome C were assessed by Western blot. Results:Metformin could inhibit the proliferation of U266 cell in a time-and concentration-dependent manner. The U266 cells were arrested in G₁/G₀ phase after metformin treatment for 48 h, as compared with non-treated U266 cells. The proteins expression of BCL-2 and BCL-XL was down-regulated and the protein expression of BAX was up-regulated. The released of cytochrome C from mitochondria to cytoplasm was increased, and protein splicing of PARP was also enhanced. Conclusion: Metformin can inhibit the cell proliferation and induce U266 cell apoptosis through the mitochondrial apoptotic pathway.更多还原