雷帕霉素协同去甲氧柔红霉素诱导人急性T淋巴细胞白血病Jurkat细胞株凋亡的作用

目的:探讨去甲氧柔红霉素( idarubicin,IDA)联合雷帕霉素(rapamycin,Rapa)抗人急性T淋巴细胞白血病(T-ALL) Jurkat细胞株的效应及机制.方法:应用CCK-8法分析两药联用对细胞增殖的影响;Isobologram法分析两药联合作用的性质;电镜形态学观察和Annexin V/PI染色流式细胞仪检测细胞凋亡情况;免疫印迹法检测凋亡相关基因Caspase3、PARP、Caspase8、Caspase9及Akt、p-Akt、P85S6K、p-P85S6K、P70S6K、p-P7OS6K、ERK1/2、p-ERK1/2等蛋白质水平表达.结果:CCK-8法示IDA联合Rapa能明显降低IDA的半数抑制浓度(50% inhibition concentration,IC50)值.Isobologram法示两药联合指数小于1.免疫印迹法示两药联用组较IDA单用组更能激活Caspase3和底物PARP,Caspase8和Caspase9在两药联用组均呈现明显激活.IDA联用Rapa后能使mTOR 信号通路上游的Akt及下游的P85S6K、P70S6K分子磷酸化水平明显降低,并能协同下调ERK的磷酸化水平.结论:Rapa和IDA对Jurkat细胞的生长抑制具有协同作用,两药联用时细胞凋亡增加,且通过线粒体和细胞膜双途径增强凋亡效应.其协同机制可能与Rapa逆转IDA引起的Akt/mTOR信号通路激活,并抑制ERK信号活化有关.

Synergistic cytotoxic effects of rapamycin and idarubicin on human acute T-cell lymphoblastic leukemia Jurkat cells

Objective: To investigate the cytotoxic effects of mTOR inhibitor rapamycin(Rapa) and idarubicin(IDA) on human T-cell acute lymphoblastic leukemia Jurkat cell line. Methods: The proliferation of Jurkat cells was observed by CCK-8 assay.The combined index was analyzed by Isobologram method.Apoptosis was detected by electron microscopy and flow cytometry with Annexin V/PI staining.Protein expressions of Caspase3,PARP,Caspase8,Caspase9,Akt,p-Akt,P85S6K,p-P85S6K,P70S6K,p-P70S6K,ERK1/2 and p-ERK1/2 were determin...