辛伐他汀引起的Ras-ERK途径改变对K562细胞增殖和凋亡的调节

目的 探讨辛伐他汀作用K562细胞后的Ras-细胞外信号调节激酶(ERK)信号转导通路分子水平的变化,以说明辛伐他汀通过引起Ras-ERK信号通路分子水平的变化参与K562细胞细胞增殖和细胞凋亡的调节.方法 体外用辛伐他汀处理慢性粒细胞白血病细胞株K562细胞,采用四甲基偶氮唑蓝(MTT)法检测细胞增殖抑制率,用流式细胞术检测辛伐他汀作用后的细胞周期和凋亡率的变化,用逆转录聚合酶链反应检测Ras-ERK信号通路分子在转录水平的变化.结果 辛伐他汀能抑制K562细胞的增殖,使K562细胞停滞在G_0-G_1期,明显诱导K562细胞凋亡,Ras-ERK信号通路的大多数分子在转录水平出现差异表达.结论 辛伐他汀可能通过作用于参与细胞增殖和凋亡的Ras-ERK信号通路抑制K562细胞增殖并诱导细胞凋亡.

Regulation of proliferation and apoptosis of K562 cells by changes of Ras-ERK pathway induced by simvastatin

Objective To investigate the changes in molecule levels of Ras-ERK signal pathway of K562 cells treated with simvastatin in vitro,and to illustrate that simvastatin inducing the changes in molecule levels of Ras- ERK signal pathway is involved in regulation of proliferation and apoptosis of K562 cells. Methods K562 cells,the chronic myelocytic leukemia(CML) cell lines,were cultured and treated with simvastatin in vitro and proliferation activity of K562 cells was detected by MTT. The changes of apoptosis rate and cell cycle of K562 cells were measured by flow cytometry(FCM). The molecular changes of Ras-ERK signal pathway were analyzed by RT- PCR in transcriptional level. Results The proliferation of K562 cells was inhibited by simvastatin,and G_0-G_1 arrested in K562 cells and significant apoptosis rate was observed with FCM. Most molecules of Ras- ERK signal pathway expressed differentially at transctiptional level. Conclusion Simvastatin probablely inhibit proliferation and induces apoptosis of K562 cells,depending on Ras-ERK signal pathway which is involved in cell proliferation and apoptosis.