苦参碱体外诱导人结肠腺癌SW620细胞凋亡的实验研究

目的 观察苦参碱(MT)诱导结肠腺癌细胞株SW620凋亡的作用并探讨其可能机制.方法 采用MTT法检测MT对SW620细胞的增殖抑制作用.应用流式细胞仪检测MT对SW620胞生长周期的影响,光学显微镜、荧光显微镜、电镜下观察细胞形态学变化.Annexin V-FITC法检测MT对SW620细胞凋亡的影响.结果 MT抑制SW620细胞增殖和诱导SW620细胞的凋亡作用均呈剂量和时间依赖性,其48 h IC50=0.934 mg/ml.与对照组相比,苦参碱处理后的SW620细胞G0/G12期百分比明显增高,S期细胞比例下降.细胞爬片HE染色以及透射电镜可见实验组细胞出现典型的细胞凋亡形态改变:细胞皱缩,体积减小,胞浆凝聚,空泡化明显,凋亡小体形成以及所谓的"印戒"细胞.结论 MT在体外能抑制SW620细胞的增殖.诱导细胞凋亡,其诱导作用具有明显的量效和时效关系.

Matrine-induced apoptosis in human colon adenocarcinoma SW620 cells

OBJECTIVE: To investigate the effects of matrine on the cell cycle and apoptosis in human colon adenocarcinoma SW620 cells and explore the possible mechanisms. METHODS: The effect of matrine on cell proliferation was assessed using MTT assay, and the cell cycle arrest induced by matrine was determined by flow cytometry. The changes of cell morphology were observed through optical microscope, fluorescence microscope and electron microscope, and the cell apoptosis was detected using Annexin V-FITC apoptosis assay. RESULTS: Matrine inhibited the proliferation of SW620 cells in a dose- and time-dependent manner. Compared with the control group, the matrine-treated cells showed increased cell percentage arrested in G 0/G1 phase with decreased S-phase cells. Morphologically, the SW620 cells treated with matrine exhibited cell shrinkage, cell size reduction, plasma condensation, cytoplasmic vacuolar changes, and formation of apoptotic body with also the presence of the signet-ring cells, all typical of apoptotic cells. CONCLUSION: Matrine exposure of SW620 cells inhibits the cell proliferation, causes cell cycle arrest at G 0/G1 phase, and induces apoptosis in a dose- and time- dependent manner.