Related Articles Late CD8+ T cell-dependent xenoantibody production in innate tolerant nude rats after hamster islet grafting but not after hamster heart grafting. Transplantation. 2008 May 27;85(10):1489-95 Authors: Devos T, Shengqiao L, Gysemans C, Yan Y, Damme BV, Nelson-Holte M, Billiau AD, Waer M, Mathieu C BACKGROUND: Xenograft rejection can be provoked by both the innate and adaptive immune compartments and close reciprocal interactions exist between these two systems. We investigated the interdependent roles of T and B lymphocytes in vascularized (heart) and cellular (islet) xenograft rejection in a model with established xeno-nonreactivity of the innate immune system. METHODS: Specific innate xenotolerance was induced in nude rats bearing either a hamster heart or a hamster pancreatic islet graft by a tolerizing regimen consisting of donor antigen infusion, temporary natural killer cell depletion and a 4-week administration of leflunomide. One month after transplantation, syngeneic CD4 and CD8 T cells were adoptively transferred. RESULTS: Both vascular and cellular xenografts were rejected after CD4 T cell reconstitution, corresponding with production of high IgM and IgG xenoantibody titers. Deposition of xenoantibodies and complement was seen in the heart but not in the islet xenografts. After infusion of CD8 T cells, xenohearts underwent a delayed type of rejection without xenoantibody production and xenoislets were not reje ...
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