【摘要】 目的　探讨T细胞疫苗诱导特异性免疫耐受与外周血T细胞凋亡的关系。方法　制备针对Wistar大鼠的SD大鼠T细胞疫苗 ,然后用该疫苗免疫健康SD大鼠 ,每周 1次 ,连续 3周 ,作为实验组 (n =6)。对照组 (n =6)用RPMI 164 0培养液替代T细胞疫苗。以被免疫的SD大鼠的脾细胞作为反应细胞 ,以Wistar大鼠的脾细胞作为刺激细胞 (经丝裂霉素处理 ) ,于接种前和每次接种后第 5天进行单向混合淋巴细胞反应 (3 H TDR掺入法 ) ,测定其cpm值 ;用流式细胞仪对外周血T细胞凋亡情况进行检测。结果　混合淋巴细胞反应结果显示 ,实验组SD大鼠脾细胞免疫应答能力于接种后受到显著抑制 ,其cpm值较接种前显著降低 (P<0 .0 1) ;对照组接种前后各时点比较 ,其差异无显著性(P>0 .0 5 ) ;接种后相同时点的cpm值组间比较 ,实验组显著低于对照组 (P <0 .0 1) ;与接种前比较 ,接种后实验组外周血T细胞凋亡率显著增高 (P<0 .0 1) ,且随着疫苗接种次数的增加而升高 ,而对照组接种后各时点T细胞凋亡率与接种前比较差异无显著性 (P>0 .0 5 )。结论　T细胞疫苗可以诱导同种特异性免疫耐受 ,其机理可能是通过诱导外周血T细胞凋亡 ,清除抗原特异性反应性T细胞克隆来实现的。更多还原

【Abstract】 Objective To investigate the relationship between peripheral T cell apoptosis and specific immune tolerance induced by T cell vaccination(TCV). Methods T cell vaccinations were made from the spleen cells of SD rats, which were induced by ConA and were challenged with the spleen cells of Wistar rats. Normal SD rats were vaccinated intraperitoneally with TCV (experimental group) or RPMI 1640 culture buffer (control group) respectively .One-way mixed lymphocyte reaction (MLR) were performed,the apoptosis of peripheral T cell were assayed using flow cytometric analysis before and after vaccination.Results In experimental group, the result of MLR showed that the response captivity of SD rat spleen cells were suppressed significantly after vaccination in comparison with pre-vaccination ( P <0.01) and the percentage of peripheral T cell apoptosis was increased significantly after vaccination compared with pre-vaccination ( P <0.01) ; In control group, there was no significant difference between pre-vaccination and post-vaccination about MLR and peripheral T cell apoptosis. Conclusion T cell vaccination is capable of inducing Ag-specific immune tolerance, the T cell apoptosis of peripheral blood induced by T cell vaccination may result in the depletion of Ag-specific reactive T cells, which is vital in inducing specific immune tolerance.更多还原