联体共生诱导异基因大鼠心脏移植耐受

Cardiac transplantation tolerance induced by parabiosis in allogeneic rats

目的:通过异基因大鼠联体共生诱导心脏移植耐受并探讨其耐受机理.方法:将DA和LEW的脾细胞(2×108)分别经舌静脉注射给对方,2 d后均经腹腔注射环磷酰胺(80 mg/kg),第3天实施联体手术,联体1 w后分开,在DA→LEW之间进行异位心脏移植手术.观察、记录移植物的存活时间,通过胸腺和脾脏内嵌合体检测、MLR、体内细胞转移、IL-2逆转实验,探讨耐受机理.结果:异基因心脏移植物的存活时间明显延长;嵌合体检测显示耐受的形成和嵌合体的存在成相关性,MLR和体内细胞转移实验证明,受体大鼠的免疫应答受抑制表现为供体特异性,并且受体存在抑制细胞;IL-2逆转实验表明该耐受与克隆失活( anergy)有关.结论:通过联体共生诱导大鼠耐受、延长心脏移植存活,移植耐受的形成涉及多种机制.

Abstract Objective:To induce cardiac transplantation tolerance by parabiosis in allogeneic rats and study the mechanism of the allograft tolerance.Methods: Spleen cells 2 x 10~8 of DA and LEW rats were injected from ones to the others via the glossal vein.2 day later cyclophos-phamide(CP) 80 mg/kg was injected intraperioneally. On the third day the operation of parabiosis was carried out and then separated after 1 week.The LEW rats received DA cardiac heterotopic allografts.The survival was observed and monitored.The tolerant mechanisms were investi-gated by detection of chimerism,MLR cell-transferred tests in vivo and IL-2 reverse.Results:The cardiac allograft survival was significantly pro-longed; The detection of chimerism showed that the formation of tolerance is correlative to chimerism. MLR and cell-transferred tests in vivo demonstrated that the inhibited immune response of recipient rats is specific for donors, and suppressie cell exists in the recipient rats. The exog-enous IL-2 reverse showed that the tolerance mechanisms are relative to energy. Conclusion: The parabiosis can induce tolerance in rats and prolong rats cardiac allograft survival.The transplantation tolerance include several mechanisms.