芍药苷诱导子宫颈癌HeLa细胞凋亡的相关性分析

目的 探讨芍药苷对人子宫颈癌HeLa细胞增殖和凋亡的影响.方法 不同浓度芍药苷作用于人宫颈癌HeLa细胞后,采用四甲基偶氮唑蓝(MTT)比色法检测不同时间HeLa细胞的生长抑制效应,膜联蛋白V-异硫氰酸荧光素(FITC)/碘化丙啶(PI)双染色流式细胞术检测HeLa细胞凋亡率及细胞周期变化,透射电镜观察HeLa细胞形态变化,免疫细胞化学法检测芍药苷作用后HeLa细胞Bcl-2、Bax及Caspase-3表达的变化.结果 不同浓度的芍药苷作用不同时间后,对子宫颈癌HeLa细胞的生长抑制率呈明显的浓度-时间依赖关系,在24、48、72 h的IC50值分别为5054、2965、2459 μg/ml(P＜0.05);应用不同浓度芍药苷后HeLa细胞凋亡率逐渐增高,对照组及1000、2000μg/ml组凋亡率分别为0.94%、10.94%、13.95%(P＜0.05),细胞周期S期比例呈增多趋势;芍药苷作用48 h后透射电镜下可见HeLa细胞出现典型凋亡改变;芍药苷作用于HeLa细胞48 h后,与对照组相比Bcl-2表达减少、Bax及Caspase-3表达增多(P＜0.05).结论 芍药苷能够诱导子宫颈癌HeLa细胞凋亡,其作用机制可能与抗凋亡基因Bcl-2表达减弱及促凋亡基因Bax、Caspase-3表达增强有关.

Relevant study on apoptosis of cervical cancer HeLa cells induced by paeoniflorin

Objective To explore the effects of paeoniflorin on the proliferation and apoptosis of HeLa cells. Methods HeLa cells treated with paeoniflorin at different concentrations for different hours were assessed by the method of methyl thiazolyl tetrazolium (MTT). Cell apoptosis rate and cycle change were detected by flow cytometry with annexin V-fluorescein isothiocvanate (FITC)/propidium iodide (PI). The morphological change of HeLa cells was observed by transmission electron microscope (TEM). The expressions of Bcl-2, Bax and Caspase-3 in HeLa cells induced by paeoniflorin were detected by immunocytochemistry. Results After treatment with different concentrations of paeoniflorin for different hours, the proliferation of HeLa cells was inhibited in a dose and time-dependent manner with an IC50 value of 5054, 2965, 2459 μg/ml at 24, 48 and 72 hours respectively (P ＜ 0. 05). After treated by different concentrations of paeoniflorin (control group, 1000 and 2000 μg/ml), apoptosis was induced in HeLa cells at a rate of 0. 94%, 10. 94% and 13.95% respectively. Such effects were dose-dependent (P ＜0. 05) and the proportion of HeLa cells in Sphase was under a rising trend. Typical apoptotic changes of HeLa cells under the exposure to paeoniflorin were observed under TEM. There was a lowered expression of Bcl-2 and an elevated expression of Bax and Caspase-3 genes versus the control group after a 48-hour paeoniflorin treatment (P ＜ 0. 05). Conclusion Paeoniflorin can significantly induce the apoptosis of HeLa cells through a down-regulation of anti-apoptotic gene Bcl-2 and an up-regulation of pro-apoptotic genes Bax and Caspase-3.