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Pretransplant exposure to allogeneic lymphocytes can result in donor-specific unresponsiveness and prolonged allograft survival. Intracellular signaling events have been described in anergic T cell clones, but the biochemical events underlying in vivo induced unresponsiveness have not been studied in detail. We employed a TCR transgenic mouse, bearing the 2C TCR, providing adequate numbers of homogenous peripheral T cells to study biochemical aspects of T cell unresponsiveness in vivo. 2C mice exposed to semiallogeneic lymphocytes (H-2b x H-2d) experienced prolonged H-2d cardiac allograft survival, and cells from these mice did not proliferate or make IL-2 in response to alloantigen (H-2d). Importantly, there were marked differences in TCR-associated tyrosine phosphorylation activation patterns. The targets for the unresponsive state appear to be diminished Lck activation and absent ZAP-70 and LAT (linker for activation of T cells) phosphorylation. Our study demonstrates that Ag-induced tolerance in vivo is accompanied by altered early TCR-mediated signaling events.


Journal article


J Immunol

Publication Date





6455 - 6461


Animals, Cells, Cultured, Graft Survival, Immune Tolerance, Injections, Intravenous, Isoantigens, Lymph Nodes, Lymphocyte Activation, Mice, Mice, Inbred BALB C, Mice, Inbred C57BL, Mice, Transgenic, Phosphorylation, Phosphotyrosine, Receptors, Antigen, T-Cell, Signal Transduction, Spleen, T-Lymphocytes, ras Proteins