【摘要】 目的:探讨抗死亡受体DR4、DR5单克隆抗体(mAb)FMU1·4、FMU1·5对3株神经胶质瘤细胞株U343(敏感株)、U138(部分敏感株)、U373(耐受株)的杀伤作用及机制。方法:采用流式细胞术、RT-PCR、免疫细胞化学法、MTT比色法、电泳、DNA倍体分析和Westernblot等方法。结果:DR5在U343高表达;DR4在U373低表达,U343对FMU1·5敏感并呈剂量依赖性、对FMU1·4部分敏感;U138对FMU1·5部分敏感,对FMU1·4耐受;U373对两种抗体耐受。结论:FMU1·4、FMU1·5能不同程度地诱导三株细胞凋亡,其机制与DR4、DR5、细胞色素C和FLIP的表达有关。更多还原

【Abstract】 Objective:To study the cytotoxic effects on three glioma cell lines U343, U138, U373 induced by anti-human DR5/DR4 monoclonal antibodies(FMU1.5/FMU1.4) and the underlying mechanism.Methods:Expression of DR4/DR5 was quantitated by flow cytometry and DR/4DR5 mRNA detected by RT-PCR. Cytotoxicity exerted by FMU1.4/FMU1.5 on three cell lines was measured by MTT colorimetry and the induced apoptosis was determined by agarose gel electrophoresis, DNA ploidy analysis was studied by flow cytometry.Results:The expression of DR5 on U343 cells was higher and the expression of DR4 on U373 cells was lower. Cell line U343 was sensitive to FMU1.5 and in a dose dependent manner, but it was partially sensitive to FMU1.4; Cell line U138 was partially sensitive to FMU1.5 and resistant to FMU1.4; Cell line U373 was insensitive to two antibodies.Conclusion:Apoptosis induced by monoclonal antibodie FMU1.4/FMU1.5 vary among three cell lines. The underlying mechanism may be relevant to DR4/DR5 expression,the release of cytochrome C and FLIP.更多还原