槐定碱对人结肠腺癌细胞株SW620增殖和凋亡的影响

目的考察槐定碱对人结肠癌SW620细胞的增殖影响及探讨其诱导凋亡作用。方法MTT法测定槐定碱对SW620细胞的半数抑制浓度;光学显微镜、荧光显微镜及电镜观察细胞凋亡形态变化;流式细胞仪分析细胞周期变化及细胞凋亡率。结果实验结果显示槐定碱对体外培养的SW620细胞增殖具有明显抑制作用,并可诱导其发生凋亡,其作用呈剂量和时间依赖性,48hIC50=2.8mmol.L-1。凋亡细胞表现为细胞固缩、变圆、核染色质聚集或碎裂、胞质空泡化。DNA ladder结果显示有凋亡引起的"梯状"条带出现。流式细胞仪细胞周期分析结果表明,随着槐定碱作用时间的延长,G0-G1期细胞增多,同时S期细胞比例也相应增高。结论槐定碱对体外培养SW620细胞生长增殖有明显抑制作用,其作用机制与阻滞细胞周期的进程,诱导细胞凋亡相关。

Effect of sophoridine on proliferation and apoptosis of human colon adenocarcinoma cells (SW620)

Aim To investigate the growth-inhibition and the mechanism of apoptosis induced by sophoridine(SRI) on SW620 cells.Method MTT assay was used to detect the half-inhibition concentration(IC50),and fluorescence microscopy,electron microscopy,DNA fragmentation analysis,flow cytometry(FCM) were used to demonstrate the presence of apoptosis.Results SRI inhibited the growth of SW620 cells significantly in a dose-and time-dependent manner,and morphological characteristics of apoptosis were observed with condensation of nucleus,bubble of cytoplasm,fragment of nucleus.A DNA ladder pattern of internucleosomalfragmentation was observed.Compared with that of control group,the percentage of the G0/G1 phase and the Sphase cells increased after treated by SRI.SW620 cells were induced to undergo apoptosis and underwent G0/G1 arrest with exposure to SRI shown by FCM.Conclusions Sophoridine could induce the inhibition of cell growth by means of apoptosis in a dose-and time-dependent manner,and the blocking of G0/G1 phase of cells was involved in the mechanism of apoptosis.