三氧化二砷联合TPA对K562细胞作用的实验研究

Effects of As_2O_3 in Combination with TPA on K562 Cells

本研究旨在观察三氧化二砷(As2O3)单独或联合12-氧-十四烷酰佛波醇-13-乙酸酯(TPA)对髓系白血病细胞系K562细胞的细胞周期、分化和凋亡的影响,并探讨其可能的作用机制。采用TPA、As2O3、TPA联合As2O3分别作用于K562细胞株,在倒置显微镜下观察细胞形态改变,应用CCK-8法检测细胞增殖抑制率,Annexin V法及琼脂糖凝胶电泳观察K562细胞凋亡情况,集落形成实验检测K562集落形成率,流式细胞术检测K562细胞分化及细胞周期改变,Western blot检测P38及p-P38蛋白的表达。结果表明,TPA联合As2O3对K562细胞的促凋亡作用较单药组明显增强;As2O3使K562细胞集落形成能力降低;TPA促使K562细胞向单核巨噬细胞分化;TPA使K562细胞阻滞于G1期,As2O3使K562细胞阻滞于G2期,TPA可增强As2O3对细胞周期的影响;TPA与As2O3联用增强As2O3促磷酸化P38蛋白表达的作用。结论:TPA与As2O3联合作用能增强As2O3对K562细胞的促凋亡作用及对其细胞周期的影响。

This study was aimed to investigate the effects of arsenic trioxide （ AS2O3 ） combined with TPA on cell cycle, cell differentiation and apoptosis of K562 cell line, and their possible mechanisms. K562 cells were treated with 200 nmol/L TPA, 2 μmol/L As2O3 alone and 200 nmol/L TPA combined with 2 μmol/L As2O3. The proliferative inhibition rates were determined with CCK-8. Annexin V and agarose gel electrophoresis were adopted to detect apoptosis. Colony formation test was used to determine the colony-formation efficiency. Flow cytometry was used to detect the cell differentiation and cell cycle changes. Western blot was employed to detect the expression of P38 and p- P38 proteins. The results showed that combination treatment had synergistic effects on the proliferative inhibition and apoptosis, which were much higher than those treated alone. As2O3 could decrease the colony formation ability of K562 cells. The cells treated with both TPA and As2O3 expressed far more CDllb antigens compared with cells exposed to As2O3 alone. K562 cells treated with TPA were arrested in G1 phase compared with the control group, As2O3 increased the pecentage of K562 cells in the G2 phase. The combination treatment increased the expression of p-P38 of K562 cells compared with the cells exposed As2O3 alone. It is concluded that TPA can enhance the effect of As2O3 on inducing apoptosis and adjusting cell cycle , which will expect to provide a new therapeutic program.