【摘要】 目的　探讨半胱氨酸蛋白酶 32 (caspase 3)在丝裂霉素C(MMC)诱导膀胱癌EJ细胞凋亡中的作用。　方法　采用末端脱氧核苷酸转移酶介导生物素标记法 (TUNEL)和流式细胞术 (FCM)研究EJ细胞凋亡及细胞周期变化 ,分析caspase 3抗体对低剂量MMC诱导EJ细胞凋亡的影响。　结果　TUNEL法显示MMC组EJ细胞出现细胞凋亡特有的形态学特征 ,凋亡指数 (6 2 .9± 2 .2 ) % ,较cas pase 3抗体加MMC组 (4.9± 0 .3) %和空白组 (2 .7± 0 .7) %显著增高 (P <0 .0 0 1)。FCM检测结果明 ,MMC主要诱导G0 /G1期细胞凋亡而出现凋亡峰 ,凋亡率 2 6 .0 6 % ;caspase 3抗体能特异性抑制MMC诱导EJ细胞凋亡 ,凋亡率仅为 4.6 5 %。　结论　低剂量MMC对caspase 3的活化在诱导膀胱癌细胞凋亡中有重要作用。更多还原

【Abstract】 Objective To investigate caspase 3 in the apoptosis of EJ cells in bladder carcinoma induced by mitomycin C(MMC). Methods The apoptosis and changes in cell cycle were examined by means of TUNEL and flow cytometry. The ability of caspase 3 antibody to resist apoptosis induced by a low dose of mitomycin was also studied. Results The typical characteristics of apoptosis were observed in EJ cells treated with low dose of mitomycin and the apoptotic index (AI) was (62.9± 2.2 )%, being much higher than that in the group treated combinedly with caspase 3 antibody and MMC(4.9±0.3)% and in the controls (2.7±0.7)%, P <0.001. The result of FCM suggested that MMC induced mainly cells in G0 /G1 phase presenting thus an apoptotic peak with an apoptotic rate of 26.06%. caspase 3 antibody could inhibit specifically the induction of apoptosis of EJ cells by MMC reducing the apoptotic rate to 4.65%. Conclusions The activation of caspase 3 by a low dose of MMC plays an important role in the induction of apoptosis of bladder carcinoma cells.更多还原