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• W1978595166 abstract "Modified limiting dilution analysis (LDA) techniques were used to evaluate the mobilization of antigen-stimulated helper T lymphocytes (HTL) and cytotoxic T lymphocytes (CTL) following allogeneic heterotopic cardiac transplantation. These modified LDA techniques allow a quantitative comparison of T cells that have been stimulated by antigen in vivo versus unstimulated precursor T cells of the same antigen specificity. Endothelial changes associated with mononuclear cell infiltration of the transplant were studied using endothelia-specific monoclonal antibodies and immunohistochemistry. Early (day 3) infiltration of cardiac allografts was characterized by a prevalence of donor alloantigen-specific HTL over CTL. Immunohistology revealed that the day-3 infiltrate was associated with areas of differentiated vascular endothelium, located primarily in the subepicardial region. Though donor-specific precursor HTL and CTL were present in the peripheral lymphoid tissues and blood, very few of them had been stimulated at this early time. During the latter phases of the response (days 6-9), antigen-stimulated HTL and CTL were present in the rejecting heart with CTL dominating the response. Accumulation of large numbers of donor-specific CTL in the allograft correlated with extensive inflammatory endothelial development, myocyte destruction, and loss of graft function by day 9. Stimulated HTL and CTL were detectable in peripheral lymphoid tissues at days 6 and 9. In addition, a marked increase in the number of donor-specific precursor CTL, but not precursor HTL, was observed in the lymphoid tissues at the peak of the response. Depletion of class II MHC-restricted T cells by in vivo treatment with anti-CD4 mAb eliminated HTL activity in all lymphoid compartments assessed and markedly reduced the number of CTL infiltrating the allograft. In addition, no stimulated CTL were detectable in lymphoid tissues, and the number of precursor CTL was not increased. In anti-CD4-treated recipients, cardiac allografts remained functional with minimal histological evidence of rejection for at least 21 days. Though graft-associated inflammatory endothelia were absent in anti-CD4-treated recipients at day 6, endothelial differentiation was observed in day 21 allografts in anti-CD4-treated recipients. These observations indicate that inflammatory endothelial development may precede T cell infiltration and subsequent loss of the cardiac allograft function. Thus, CD4-positive HTL are required for (1) graft-associated inflammatory endothelial development; (2) CTL activation in peripheral lymphoid tissues; (3) CTL accumulation in allografted tissues; and (4) acute cardiac allograft rejection." @default.
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• W1978595166 date "1992-04-01" @default.
• W1978595166 modified "2023-09-23" @default.
• W1978595166 title "Mobilization of T lymphocytes following cardiac transplantation. Evidence that CD4-positive cells are required for cytotoxic T lymphocyte activation, inflammatory endothelial development, graft infiltration, and acute allograft rejection." @default.
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