供者特异性抗原诱导免疫耐受的实验研究

目的　比较不同特异性抗原和不同输注途径诱导免疫耐受的强度及探讨其可能机理。方法　建立大鼠颈部异位心脏移植模型 ,采用供体特异性全血、供体特异性脾细胞和骨髓细胞 (DSBM) ,通过外周、门静脉和胸腺三种不同途径输注以诱导免疫耐受的产生和维持。结果　供体特异性抗原诱导免疫耐受以 DSBM及通过胸腺接种途径效果最佳。结论　供者特异性抗原能诱导受体免疫耐受并促进移植物存活 ,可望成为较理想的临床免疫耐受诱导方法。

Study on Donor-Specific Antigens in Inducing Immunogical Tolerance

Objective　 To compare the effects of different donor-specific antigens, through different pathways, on the inducement of immunological tolerance. Methods　 After the establishment of a stable rat cervical heterotopic heart transplantation model, donor specific transfusion (DST), donor specific spolenocyte (DSSL) and donor specific bone marrow (DSBM) were given to recipients 3-14 days prior to the transplantation through peripheral vein, portal vein and intrathymic injection respectiviely. Low dose CsA 5mg/(kg*d) was given from the 3rd-14th day pre-transplantation to the 28th day post-transplantation. The survival time of cardiac grafts was monitored, meanwhile, the donor specific mixed lymphocyte reaction (MLR) and the subsets of T lymphocytes CD8+ were determined. Results　 DSBM and the administrative pathway of intrathymic injection achieved the best effects on the inducement of immunological tolerance and the improvement of graft survival. Conclusion　 The donor specific antigens can induce the donor-specific immunological tolerance. It may be a practicable approach for the clinical experiments in the future.