孕酮和孕酮受体拮抗剂米非司酮对K562白血病细胞系增殖和分化的影响

目的: 观察孕酮和孕酮受体拮抗剂米非司酮(RU486)对K562白血病细胞增殖和分化的影响。方法: 用10^-5 mol/L 孚酮分别联合10^-5 mol/L、10^-6 mol/L和10^-7 mol/L RU486共同作用K562白血病细胞5 d,采用液体培养,XTT实验和集落培养实验观察K562细胞增殖能力;用流式细胞术检测K562细胞周期;通过Wright-Giemsa染色、联苯胺染色和表面分化抗原CD71表达观察孕酮和RU486对K562细胞分化的作用。结果: 液体培养,XTT实验和集落形成抑制实验均显示单独使用孕酮可显著抑制K562细胞增殖,与对照组比较有显著差异(P<0.01)。孕酮联合RU486对K562细胞的增殖抑制作用减弱,与单独使用孕酮组比较有显著差异(P<0.01),呈剂量依赖关系。形态学观察孕酮处理组K562细胞体积变大,核浆比例减少,趋向成熟分化。联苯胺染色吸光度值升高,与对照组比较差异显著(P<0.01)。流式细胞术检测10^-5 mol/L 孕酮处理4 d后K562细胞膜上CD71表面标记表达阳性率为(85.72±2.31)%,显著高于对照组(P<0.01);但孕酮联合RU486对K562细胞的诱导分化作用减弱,与单独使用孕酮组比较有显著差异(P<0.01),并呈剂量依赖关系。细胞周期显示孕酮可将K562细胞周期阻滞在S期。但孕酮联合RU486组分布于S期的K562细胞百分比显著下降,与单独使用孕酮组比较差异显著(P<0.01),并呈剂量依赖关系。结论: 孕酮可抑制K562细胞增殖并诱导其向红系分化,而RU486可阻断P对K562细胞的增殖抑制与诱导分化作用。

Effects of progesterone and progesterone receptor antagonist mifepristone on proliferation and differentiation of K562 human leukemia cells

AIM:To investigate the effects of progesterone and progesterone receptor antagonist mifepristone on human leukemia cell line K562.METHODS: The K562 cells were treated with 10-5 mol/L progesterone alone or combined with mifepristone at the concentrations of 10-5,10-6 and 10-7 mol/L in the culture.The proliferative effects of progesterone and mifepristone on K562 cells were studied by liquid culture,colony count and XTT assay,and the differentiation effects were determined by morphological observation,benzidi...