To study the mechanisms involved in the inhibition of chronic myeloid leukemic cells (K562) proliferation induced by arsenic trioxide (As 2O 3) and to explore the potential role of Survivin, an inhibitor of apoptosi...To study the mechanisms involved in the inhibition of chronic myeloid leukemic cells (K562) proliferation induced by arsenic trioxide (As 2O 3) and to explore the potential role of Survivin, an inhibitor of apoptosis protein, in the regulation of As 2O 3 induced cell apoptosis, K562 cells were cultured with As 2O 3 of different concentrations. Cells were collected for proliferation analysis by MTT assay. Cell cycle distribution and cell apoptosis were analyzed by flow cytometry. Expression of Survivin protein and mRNA were detected by flow cytometry and RT-PCR, respectively. Our results showed that As 2O 3 (2-10 μmol/L) inhibited K562 cells growth effectively, but it did not induce cells apoptosis significantly. The percentage of K562 cells at G 2/M phase increased in proportion to As 2O 3 concentrations, and the expression of Survivin mRNA and content of Survivin protein was up-regulated accordingly. It is concluded that As 2O 3 inhibited K562 cells growth by inducing cell cycle arrest mainly at G 2/M phase. Over-expression of Survivin gene and protein might be one of the possible mechanisms contributing to K562 cells' resistance to As 2O 3-induced apoptosis.展开更多
目的:研究设计合成新的大黄素衍生物E19对慢性髓系白血病细胞株K562及耐伊马替尼的K562细胞株K562/G01的增殖、凋亡的影响,探讨其作用的机制。方法:采用MTT比色法、细胞集落形成实验观察E19对K562、K562/G01细胞增殖的影响;应用DAPI染...目的:研究设计合成新的大黄素衍生物E19对慢性髓系白血病细胞株K562及耐伊马替尼的K562细胞株K562/G01的增殖、凋亡的影响,探讨其作用的机制。方法:采用MTT比色法、细胞集落形成实验观察E19对K562、K562/G01细胞增殖的影响;应用DAPI染色法和DNA片段化检E19诱导细胞凋亡的作用;Western blot检测E19作用后不同时间段p210^(Ber-Abl)和p-P210^(Bcr-Abl)蛋白的变化。结果:大黄素衍生物E19对K562和K562/G01细胞有明显的抑制增殖、诱导凋亡的作用,K562细胞48 h半数抑制浓度(IC_(50))为(1.20±0.19)μmol/L,K562/G01细胞48 h IC_(50)为(1.22±0.16)μmol/L;DNA片段化检测证实,E19对细胞抑制作用呈量效关系;E19作用于细胞后,P210^(Bcr-Abl)和p-P210^(Bcr-Abl)表达水平均有不同程度下调,并呈量效和时效关系。结论:大黄素衍生物E19能有效抑制K562和K562/G01细胞的增殖并诱导它们凋亡,而P210^(Bcr-Abl)和p-P210^(Bcr-Abl)的活化受抑制在其中发挥重要的作用。展开更多
文摘To study the mechanisms involved in the inhibition of chronic myeloid leukemic cells (K562) proliferation induced by arsenic trioxide (As 2O 3) and to explore the potential role of Survivin, an inhibitor of apoptosis protein, in the regulation of As 2O 3 induced cell apoptosis, K562 cells were cultured with As 2O 3 of different concentrations. Cells were collected for proliferation analysis by MTT assay. Cell cycle distribution and cell apoptosis were analyzed by flow cytometry. Expression of Survivin protein and mRNA were detected by flow cytometry and RT-PCR, respectively. Our results showed that As 2O 3 (2-10 μmol/L) inhibited K562 cells growth effectively, but it did not induce cells apoptosis significantly. The percentage of K562 cells at G 2/M phase increased in proportion to As 2O 3 concentrations, and the expression of Survivin mRNA and content of Survivin protein was up-regulated accordingly. It is concluded that As 2O 3 inhibited K562 cells growth by inducing cell cycle arrest mainly at G 2/M phase. Over-expression of Survivin gene and protein might be one of the possible mechanisms contributing to K562 cells' resistance to As 2O 3-induced apoptosis.
文摘目的:研究设计合成新的大黄素衍生物E19对慢性髓系白血病细胞株K562及耐伊马替尼的K562细胞株K562/G01的增殖、凋亡的影响,探讨其作用的机制。方法:采用MTT比色法、细胞集落形成实验观察E19对K562、K562/G01细胞增殖的影响;应用DAPI染色法和DNA片段化检E19诱导细胞凋亡的作用;Western blot检测E19作用后不同时间段p210^(Ber-Abl)和p-P210^(Bcr-Abl)蛋白的变化。结果:大黄素衍生物E19对K562和K562/G01细胞有明显的抑制增殖、诱导凋亡的作用,K562细胞48 h半数抑制浓度(IC_(50))为(1.20±0.19)μmol/L,K562/G01细胞48 h IC_(50)为(1.22±0.16)μmol/L;DNA片段化检测证实,E19对细胞抑制作用呈量效关系;E19作用于细胞后,P210^(Bcr-Abl)和p-P210^(Bcr-Abl)表达水平均有不同程度下调,并呈量效和时效关系。结论:大黄素衍生物E19能有效抑制K562和K562/G01细胞的增殖并诱导它们凋亡,而P210^(Bcr-Abl)和p-P210^(Bcr-Abl)的活化受抑制在其中发挥重要的作用。
