超抗原SEB体外诱导胸腺细胞凋亡的研究

The study of the induction of thymocytes apoptotisis by superantigen SEB in vitro

目的 :观察超抗原SEB能否在APC的辅助下体外诱导胸腺细胞凋亡 ,并研究其机制。方法 :SEB作用于与APC混合培养的胸腺细胞 ,用DNA凝胶电泳、DNA片段测定等判定胸腺细胞凋亡并作定量分析 ;用间接免疫荧光法标记并以流式细胞仪检测Fas、FasL的表达。结果 :SEB处理组胸腺细胞有凋亡表现且凋亡率明显高于对照组 ,Fas、FasL的表达明显高于对照组。结论 :SEB可以于体外在APC辅助下诱导胸腺细胞凋亡 ,Fas、FasL的高表达可能在凋亡中起重要作用 。

Objective:To investigate whether superantigen SEB,with the assistance of APCs,could induce apoptosis of thymocytes in vitro,and to study the mechanism involved.Methods:SEB was given to thymocytes which were cultured together with APCs.Apoptosis was detected by DNA electrophoresis and DNA fragmentation assay.Expressions of Fas and FasL were detected by flow cytometry.Results:The thymocytes treated with SEB had the characters of apoptosis,and the apoptotic rate and expressions of Fas and FasL was significantly increased compared with control.Conclusion:SEB,together with APCs,can induce apoptosis of thymocytes in vitro,high expressions of Fas and FasL on thymocyte may participate in the mediation of apoptosis.This may provide a method to study the negative selection of thymocytes.