摘要
目的 检测氟尿嘧啶诱导肝癌细胞凋亡过程中caspase 9的活化及caspase 9活性变化 ,以确定caspase 9在氟尿嘧啶诱导的肝癌细胞凋亡中的作用。方法 用氟尿嘧啶处理HepG 2细胞 ,分别作用 2 ,4,8,16,2 4h ,用荧光检测试剂盒检测HepG2细胞凋亡过程中caspase 9的活性变化 ;Western blot分析caspase 9的活化 ;流式细胞仪检测加入caspase 9抑制剂后细胞凋亡百分率的变化。结果 氟尿嘧啶处理肝癌细胞 4h后caspase 9活性开始升高 ,于 16h达到高峰 ,与对照组比较差异有显著性 (P<0 .0 1)。Western blot分析发现caspase 9被蛋白酶水解切断后形成的 10kD片段 ;使用caspase 9抑制剂后 ,肝癌细胞凋亡百分率明显下降 ,抑制剂组与氟尿嘧啶组比较 ,差异有显著性 (P <0 .0 5 )结论 在氟尿嘧啶诱导肝癌细胞凋亡过程中caspase 9被活化 ,活性明显增强 ,caspase 9抑制剂可阻断这一过程。结果表明caspase 9参与了氟尿嘧啶诱导的肝癌细胞凋亡。
Objective To determine the effect of caspase 9 in the apoptosis of hepatoma cells induced by flurouracil , and to investigate the activity alteration and proteolytic cleavage of caspase 9. Methods The human hepatoma HepG2 cells were treated with flurouracil for 2,4,8,16,24h respectively. The caspase 9 activity was detected using caspase 9 Fluorescent Assay Kit.Proteolytic cleavage of caspase 9 was analyzed by Western blot.The apoptotic rates of HepG2 cells induced by flurouracil with or without caspase 9 inhibitor treatment were measured by flow cytometry. Results Four hours after being treated with flurouracil, the caspase 9 activity in HepG2 cells increased gradually and reached the peak at 16h.Compared with the control group, the difference was significant (P<0.01). In Western blot analysis, caspase 9 was found cleaved into 10 KD fragment. In the presence of caspase 9 inhibitor, the apoptotic rates of HepG2 cells induced by flurouracil decreased.Significant difference existed between the flurouracil group and the inhibitor treatment group (P<0.05). Conclusions Caspase 9 is activated in the apoptosis of HepG2 cells induced by flurouracil ,and the activity of caspase 9 is enhanced remarkably,suggesting that caspase 9 may be involved in the apoptosis of hepatoma cells induced by flurouracil.
出处
《中国普通外科杂志》
CAS
CSCD
2003年第3期173-175,共3页
China Journal of General Surgery
