雷帕霉素联合紫杉醇诱导卵巢癌细胞A2780和SKOV3凋亡及其分子机制

Induction Effect of Rapamycin Combined Paclitaxel on Apoptosis of Ovarian Cancer Cell Lines A2780 and SKOV3 and the Molecular Mechanism

背景与目的:研究表明,哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)在恶性肿瘤发生发展中起重要作用,本研究观察特异性mTOR抑制剂雷帕霉素联合紫杉醇对卵巢癌细胞A2780和SKOV3的作用,并探讨其内在的分子机制。方法:A2780、SKOV3细胞经雷帕霉素和紫杉醇处理后,以MTT法检测细胞的增殖情况,金正均法计算q值判断两药的相互作用。以流式细胞仪检测细胞凋亡,逆转录聚合酶链反应(reverse transcription polymerase chain reaction,RT-PCR)检测survivin的表达。结果:雷帕霉素联合紫杉醇可抑制A2780和SKOV3细胞增殖,且随时间延长抑制作用越显著,当两药合用72h时抑制率分别达到34.9%(A2780)和37.1%(SKOV3),与单独用药组相比差异有显著性(P<0.01),金正均法显示各时间点q值均>1.15,显示二者有协同作用。雷帕霉素和紫杉醇可使A2780和SKOV3细胞发生凋亡,并且在两者联用时凋亡率达到最高。经雷帕霉素和紫杉醇作用后的A2780和SKOV3细胞表达survivin较处理前明显下降。结论:体外雷帕霉素和紫杉醇可抑制A2780和SKOV3细胞增殖并诱导其发生凋亡,并可使survivin基因的表达下调,且两者联合应用时可显著增加其抑制作用,具有协同作用。

BACKGROUND ＆ OBJECTIVE： Previous researches confirmed that the mammalian target of rapamycin （mTOR） plays an important role in the tumorigenesis and development of malignant tumors. This study was to investigate the effect of rapamycin, a selective inhibitor of mTOR, combined paclitaxel on the apoptosis of ovarian cancer cell lines A2780 and SKOV3, and explore the molecular mechanism. METHODS： A2780 and SKOV3 cells were treated with rapamycin and （or） paclitaxel. Cell proliferation was assessed by MTT assay. The interaction of rapamycin and paclitaxel was estimated by Jin Zhengjun＇s method. Cell apoptosis was detected by flow cytometry （FCM）. The expression of survivin in A2780 and SKOV3 cells was detected by reverse transcription-polymerase chain reaction （RT-PCR）. RDSULTS. When treated with rapamycin combined paclitaxel for 72 h, the proliferation inhibition rate was 34.9% for A2780 cells and 37.1% for SKOV3 cells, which was significantly higher than those of the cells treated with rapamycin or paclitaxel alone （P〈0.01）. These 2 drugs showed synergistic effect （q〉1.15）. The apoptosis of A2780 and SKOV3 cells were induced by rapamycin and paclitaxel; the apoptosis rate reached to the peak when the cells were treated with rapamycin combined paclitaxel. The expression of survivin in A2780 and SKOV3 cells was declined obviously after treatment of rapamycin combined paclitaxel. CONCLUSIONS： Rapamycin and paclitaxel could inhibit proliferation and induce apoptosis of A2780 and SKOV3 cells in vitro, and down-regulate the expression of survivin. These 2 drugs have synergistic effect on cell proliferation.