脱氧雪腐镰刀菌烯醇对体外培养胃癌细胞SNU凋亡的影响

目的探讨脱氧雪腐镰刀菌烯醇（DON）对胃癌细胞SNU凋亡的影响。方法体外培养的胃癌细胞株SNU经不同浓度（50、100、1000、2000μg／L）DON处理12h，以流式细胞术（FCM）和免疫蛋白印记（Western blotting）法检测细胞凋亡和凋亡相关蛋白bax、bcl-2、Caspase-3的表达情况。结果FCM榆测结果表明，DON处理12h后，各处理组SNU细胞凋亡率均高于对照组。在50～2000μg／L浓度范同内随着DON浓度升高凋亡率亦相应升高，两者呈明显剂量依赖关系（r=0．940，P〈0．01）。FCM和Westrn blotting法检测结果显示，DON作用12h后，SNU细胞bax和Caspase-3表达升高，bcl-2表达降低．结论DON可剂量依赖地诱导体外培养的胃癌细胞SNU凋亡，上调bax蛋白的表达，下调bcl-2蛋白的表达，进而激活Caspase-3，可能在SUN细胞凋亡过程中发挥作用。

Effects of deoxynivalenol on apoptosis of human gastric carcinoma cell line SNU in vitro

Objective To explore the effects of deoxynivalenol (DON) on apoptosis of human gastric carcinoma cell line SNU in vitro. Methods SNU cells were treated with DON at different concentrations (50, 100, 1000, 2000 μg/L) for 12 hours, and then cells were harvested for cell apoptosis by flow cytometric (FCM) DNA analysis and the expression of Bax, Bcl-2 and Caspase-3 at protein level with FCM and Western blotting. Results FCM results showed that the apoptosis rates of SNU cells in DON treatment groups were all higher than that in control, especially in DON 1000 μg/L and 2000 μg/L groups (P<0.05). In the concentration range from 50 to 2000 μg/L, a significant concentration-depended response correlation could be found between apoptosis rate and DON concentration (r =0.940, P <0.01). FCM and Western blotting showed Bax and Caspase-3 expression in often SNU cells DON treatment for 12 hours were up-regulated while that of Bcl-2 was down-regulated. Conclusion DON can induce apoptosis of SNU cells in vitro in dose-dependent manner, and possible mechanisms of apoptosis induction effects may be up-regulation of the expression of Bax and down-regulation of that of Bcl-2 and activation of the key enzyme of apoptosis Caspase-3.