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pubmed-article:9712028pubmed:abstractTextWe examined whether IL-2 regulates alloimmune responses by studying allograft survival in wild-type (IL-2+/+) and IL-2 gene-knockout (IL-2-/-) mice. The acute rejection of vascularized, cardiac allografts and the generation of allospecific CTLs were not impaired in the absence of IL-2. In contrast, blocking the B7-CD28 T cell costimulation pathway with CTLA4Ig induced long-term allograft survival (> 100 days) in IL-2+/+ recipients but failed to do so in IL-2-/- mice or in wild-type mice that had been treated with IL-2-neutralizing Ab around the time of transplantation. Allografts rejected by IL-2-/- recipients exhibited extensive mononuclear cell infiltrates despite CTLA4Ig administration. In vivo allostimulation in the absence of IL-2 led to exaggerated T lymphocyte proliferation and impaired apoptosis of activated T cells in untreated and CTLA4Ig-treated mice. These findings indicate that endogenous IL-2 is required for the induction of long-term allograft survival, and that IL-2 regulates alloimmune responses by preparing activated T lymphocytes for alloantigen-induced apoptosis.lld:pubmed
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pubmed-article:9712028pubmed:articleTitleImpaired alloantigen-mediated T cell apoptosis and failure to induce long-term allograft survival in IL-2-deficient mice.lld:pubmed
pubmed-article:9712028pubmed:affiliationThe Carlos and Marguerite Mason Transplantation Research Center, Emory University and Veterans Affairs Medical Center, Atlanta, GA 30033, USA.lld:pubmed
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