期刊
TRANSPLANTATION PROCEEDINGS
卷 38, 期 10, 页码 3207-3208出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.transproceed.2006.10.094
关键词
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Liver allografts are accepted spontaneously in all mouse strain combinations without immunosuppressive therapy. The mechanisms underlying this phenomenon remain largely undefined. In this study, we examined the effect of CD4(+)CD25(+) T regulatory cells (Treg) on the induction of mouse liver transplant tolerance. Orthotopic liver transplantation was performed from B10 (H2(b)) to C3H (H2(k)) mice. Depleting rat anti-mouse CD25 mAb (PC61) was given to the donors or recipients (250 mu g/d IP) pretransplant or to the recipients postoperatively. At day 5 posttransplantation, both effector T cells (mainly CD8) and CD4(+)CD25(+) Treg were increased in the liver allografts and host spleens compared to naive mice. Anti-CD25 mAb administration, either pretransplantation or posttransplantation, reduced the ratio of CD4(+)CD25(+) Treg to the CD3 T cells of liver grafts and recipient spleens and induced liver allograft acute rejection compared to IgG treatment. Anti-CD25 mAb administration elevated anti-donor T-cell proliferative responses and CTL and NK activities of graft infiltrates and host splenocytes; reduced CTLA4, Foxp3, and IDO mRNA levels; increased IL-10 and IFN-gamma; and decreased IL-4 mRNA levels in the livers or host spleens. The number of apoptotic T cells was reduced significantly in the liver grafts and treated host spleens. Therefore, anti-CD25 mAb administration changed the balance of CD4(+)CD25(+) Treg to activated T cells of liver graft recipients, preventing liver transplant tolerance. This was associated with enhanced anti-donor immune reactivity, downregulated Treg gene expression, and reduced T cell apoptosis in the grafts and host spleens.
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