Abstract
Objective To induce the tolerance to cardiac allograft by combined blockade of OX40/OX40L and CD28/B7 co-stimulatory signaling and donor specific spleen cell transfusion in rat mod-els of pre-existent allogenic reactive memory T lymphocytes. Methods Lewis rats that underwent 3 days of adoptive transfer of donor specific CD8~+ memory T cells, separated by immunomagnetic bead separation kit, received either separate or combined transfusion of AdCTLA4Ig, AdOX40Ig, donor spleen cells (DST) and transplantations of hearts of DA rats at the same time. Cardiac allografts were taken out 48 h after transplantation for histological analysis and cytokines expression ,and survival time of cardiac allografts with different treatments was observed. Results Compared with AdCTLA4Ig, AdOX40Ig and DST groups, AdCTLA4Ig + AdOX4OIg + DST group showed lower cardiac pathological grade with much lower expression level of IL-2 and IFN-γ,and much longer heart survival time. Conclusion Combined blockade of OX40/ OX40L and CD28/B7 and donor specific spleen cell transfusion could induce rat cardiac graft tolerance. Key words: Heart transplantation; Memory T lymphocytes; Immune tolerance
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