内质网应激在维生素E琥珀酸酯诱导人胃癌细胞凋亡中的作用
首发时间:2011-07-26
摘要:目的: 探讨内质网应激在维生素E琥珀酸酯(VES)诱导人胃癌SGC-7901细胞凋亡过程中的作用。方法: 分别采用Western Blotting 和RT-PCR法分析VES不同剂量和不同作用时间对GRP78、GRP94和CHOP蛋白和mRNA表达的影响;用RNA瞬时干扰阻断CHOP的表达,再用VES作用SGC-7901细胞后,采用DAPI染色法观察细胞凋亡的改变。 结果: 阳性对照组及20μg/mL VES组在转录水平上均诱导GRP78、GRP94和CHOP的表达,并具有时间依赖性;在翻译水平上20μg/mL VES显著增加GRP78和CHOP的表达,具有时间依赖关系,GRP94表达先降低,而后又升高;阻断CHOP显著降低VES诱导的细胞凋亡。结论: 内质网应激可能参与了VES诱导的SGC-7901细胞凋亡。
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Roles of endoplasmic reticulum stress in vitamin E succinate-induced apoptosis in human gastric cancer SGC-7901 cells
Abstract:AIM: To investigate the roles of endoplasmic reticulum stress (ERS) in vitamin E succinate(VES)-induced apoptosis in human gastric cancer SGC-7901 cells. METHODS: SGC-7901 cells were treated with VES at 5, 10 and 20 μg/ml and at 3 μg/ml tunicamycin (TM) for 24 h or at 20 μg/ml for up to 24 h. GRP78, GRP94 and CHOP were explored using Western Blotting?and RT-PCR. When the cells were transfected with CHOP siRNA, apoptosis was assessed by DAPI staining. RESULTS: The mRNA levels of GRP78, GRP94, CHOP and protein levels of GRP78, CHOP increased in 20 μg/ml VES-treated cells in time-dependent manner. GRP94 protein levels were decreased for 6h,12h and 18h, then increased again and reached the top level for 24h. Downregulation of the CHOP mRNA reversed VES-induced apoptosis. CONCLUSIONS: Endoplasmic reticulum stress might be involved in VES-induced apoptosis in human gastric cancer SGC-7901 cells.
Keywords: endoplasmic reticulum stress vitamin E succinate apoptosis
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内质网应激在维生素E琥珀酸酯诱导人胃癌细胞凋亡中的作用
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