FK506和抗淋巴细胞血清诱导兔异体膝关节移植耐受的实验研究

Induction of tolerance to knee allografts in rabbits receiving FK506 and antilymphocyte serum

目的 探讨短期使用FK5 0 6和抗淋巴细胞血清 (ALS)诱导兔同种异体膝关节移植嵌合耐受的作用。 方法 雄性大耳白兔作为供体 ,雌性新西兰白兔作为受体 ,施行同种异体异位膝关节移植 ,设单独使用ALS( 1ml/kg)组、单独使用FK5 0 6( 0 5mg/kg)组、联合使用FK5 0 6和ALS组及对照组。FK5 0 6和ALS在移植术前 1d开始使用 ,ALS连续使用 3d ,FK5 0 6连续使用 15d。观察移植物的存活时间 ,检测受体内供体血细胞嵌合率 ,进行组织切片检查。 结果 对照组平均存活 ( 13 6± 0 8)d ,单独使用ALS组为 ( 17 4± 1 8)d ,单独使用FK5 0 6组为 ( 2 3 8± 1 5 )d ,联合使用FK5 0 6和ALS组为 ( 4 0 4±2 9)d。联合使用FK5 0 6和ALS组的供体血细胞嵌合率停药后 3周稳定在 10 %以上。 结论 短期使用FK5 0 6和ALS可显著延长兔同种异体膝关节移植的存活时间 ,可维持 3周的嵌合耐受。

Objective To assessed the ability of FK506 and antilymphocyte serum(ALS) to induce mixed chimerism and tolerance for knee composite tissue allograft in rabbits without chronic immunosuppression. Methods Male Flap-eared rabbits were used as donors,and female New Zealand white rabbits were used as recipients. Vascularized heterotopic knee allotransplantation was performed. Treatment consisted of ALS(1 ml/kg) only,FK506(0.5 mg/kg) only and a combination of FK506 and ALS which were administered 24h before transplantation. ALS was administered intraperitoneally every day in the first three days. FK506 was administered gastric intubation every day for fifteen days. Survival times of knee allografts were observed. Donor specific hematopoietic chimerism and histology sections were tested. Results Survial time of knee allografts with ALS single was(17.4±1.8)d,and(23.8±1.5)d with FK506 single,(40.4±2.9)d with FK506 and ALS,contrasting with(13.6±0.8)d of control. Chimerism rate show a stabilization of 3 weeks above 10% after protocol discontinue in groups with FK506 and ALS. Conclusions Short-term administration of FK506 and ALS in this ways prolong survival time of vascularized knee allograft in rabbits and could maintain mixed chimerism and tolerance for 3 weeks.