黄芩苷对人结肠癌SW480细胞凋亡的诱导作用及其机制

目的:探讨黄芩苷对人结肠癌SW480细胞凋亡的影响,并阐明其作用机制。 方法:SW480细胞分为空白对照组,25、50和100 μmol·L^-1黄芩苷组,采用CCK-8法检测SW480细胞增殖活性,Annexin Ⅴ-FITC和DAPI染色观察SW480细胞凋亡的形态学表现,Western blotting法检测凋亡蛋白Bcl-2、caspase 3和caspase 9表达水平。 结果:与空白对照组比较,50和100 μmol·L^-1黄芩苷组SW480细胞增殖活性在24、48和72 h均明显降低( P<0.01),25 μmol·L^-1黄芩苷组SW480细胞增殖活性在48和72 h明显降低( P<0.01)。50 μmol·L^-1黄芩苷作用48 h时SW480细胞处于早期或晚期凋亡状态,细胞核呈浓缩和破碎状态。与空白对照组比较,25、50和100 μmol·L^-1黄芩苷组caspase 3和caspase 9蛋白表达水平明显升高 (P<0.05或P<0.01),Bcl 2蛋白表达水平明显降低 (P<0.05或P<0.01)。结论:黄芩苷可以诱导SW480细胞凋亡,其机制可能与线粒体途经有关。

Induction effect of baicalin on apoptosis of human colon cancer SW480 cells and its mechanism

Objective To investigate the influence of baicalin in human colon cancer SW480 cells,and to clarify its mechanism.Methods The SW480 cells were cultured and divided into blank control and 25,50 and 100 μmol·L-1 baicalin groups.The proliferation activity was detected with CCK-8 assay.The morphological changes of SW480 cells were detected by Annexin Ⅴ-FITC and DAPI coloration.The protein expression levels of Bcl-2,caspase 3 and caspase 9 were detected by Western blotting method. Results The CCK-8 assay results showed that the proliferation activities of SW480 cells in 25,50 and 100 μmol· L-1 baicalin groups were decreased significantly compared with blank control group at the time points of 24 h,48 h and 72 h (P <0.01),the proliferation activities of SW480 cells in 25 μmol·L-1 baicalin groups were decreased significantly compared with blank control group at the time points of 48 and 72 h (P <0.01).Cell shrinkage and nucleus fragmentation were observed in the SW480 cells after treated with 50 μmol·L-1 baicalin for 48 h.The Western blotting assay results showed that compared with blank control group,the protein expression levels of caspase 3 and caspase 9 in 25,50 and 100 μmol· L-1 baicalin groups were increased significantly (P <0.05 or P <0.01),and the protein expression levels of Bcl 2 in 25, 50 and 100 μmol·L-1 baicalin groups were decreased significantly (P <0.05 or P <0.01).Conclusion Baicalin can induce the apoptosis in SW480 cells,and the effect might be involved with the mitochondrial apoptotic pathway.