Anti-DR5 mAb诱导佐剂型关节炎大鼠滑膜细胞凋亡及机理初探

摘要

目的:探讨Anti-DR5 mAb诱导佐剂型关节炎(Adjuvant Arthritis,AA)大鼠滑膜细胞凋亡作用及其可能机理.方法:注射弗氏完全佐剂建立AA大鼠模型,分离并体外培养大鼠滑膜细胞.MTT检测、DNA倍体分析及流式细胞术分析Anti-DR5 mAb 对大鼠滑膜细胞的凋亡作用,Western blot检测大鼠滑膜细胞Caspase-3、Bcl-2蛋白的表达,Caspase抑制剂实验分析Anti-DR5 mAb 对大鼠滑膜细胞凋亡作用的机制.结果:MTT实验表明Anti-DR5 mAb能抑制大鼠滑膜细胞的增殖,流式细胞术分析这种作用模式为细胞凋亡.Anti-DR5 mAb处理后的大鼠滑膜细胞中Caspase-3蛋白水平上升,Bcl-2蛋白水平下调.Caspase抑制剂实验证明Anti-DR5 mAb 诱导大鼠滑膜细胞的凋亡是通过Caspase途径实现的.结论:Anti-DR5 mAb诱导大鼠滑膜细胞的凋亡,这种作用与滑膜细胞表面Caspase-3、Bcl-2蛋白表达相关.%Objective:To study the effects of Anti-DR5 mAb on inducing synovial cells of adjuvant arthritis (AA) rats and its mechanisms.Methods:AA was induced by CFA in rats.The synovial cells of rats were separated and cultured in vitro system.The apoptosis induced by anti-DR5 mAb on synovial cells was measured by MTT analysis,DNA fragmentation and flow cytometry.Caspase-3 and Bcl-2 expression in synovial cells were detected by Western blot.The involvement of the apoptotic pathway was further proved by a caspase inhibition assay.Results:MTT result showed that Anti-DR5 mAb could inhibit synovial cells growth.And flow cytometry suggested that the cell death mode was apoptosis.The protein level of caspase-3 in synovial cells treated with anti-DR5 mAb was raised,while Bcl-2 level declined.When the caspase inhibitor was added to the synovial cells treated with anti-DR5 mAb,it was showed in a dose-dependence inhibition effect,indicating that anti-DR5 mAb inducing apoptosis might be through the caspase pathway.Conclusion:Anti-DR5 mAb could induce synovial cell apoptosis through caspase pathway.And this effect may be related to the protein level of Caspase-3 and Bcl-2.