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• W2080986992 abstract "Postthymic T cell receptor (TCR)-mediated cell death offers the potential for creating antigen-specific transplant tolerance analogous to thymic clonal deletion. Murine specific CD4+ cell were rigorously purified by: (a) adherent cell depletion and (b) magnetic bead/monoclonal antibody (mAb) depletion of macrophages, Ia+ cells, mu-chain+ cells, NK cells, and CD8+ T cells. CD4+s were typically > 95% pure by flow cytometry. Resting CD4+s stimulated by plastic-immobilized anti-TCR/CD3 mAb wee shown to die in the absence of exogenous interleukin (IL)-2. Blasting CD4+s showed dose-dependent cell death upon religation of TCR/CD3 in the presence of IL-2; however, withdrawal of IL-2 from blasting CD4+s also resulted in cell death. Cell death was shown to be apoptotic by flow cytometry DNA content analysis. Anti-CD28 mAb, co-immobilized with anti-TCR/CD3 mAb, inhibited cell death of resting CD4+s in the absence of exogenous IL-2; however, anti-CD28 mAb showed minimal cell death inhibition of CD4+ blasts when TCR/CD3 was religated. In contrast, splenic adherent cells effectively inhibited cell death of blasting CD4+s induced by TCR/CD3 mAb religation. We conclude that TCR-mediated programmed cell death of highly purified splenic CD4+s is dependent upon activation state, availability of IL-2, and accessory cell or CD28 costimulator signals. Furthermore, IL-2 acts to protect against cell death in both resting and activated CD4+ T cells. IL-2 protection could be overcome by high concentrations of anti-TCR/CD3 mAb, which results in cell death of CD4+ blasts. In the effort to understand potential mechanisms of peripheral tolerance induction, these findings assist to distinguish and define conditions for antigen receptor-mediated programmed cell death of mature CD4+ T cells." @default.
• W2080986992 created "2016-06-24" @default.
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• W2080986992 date "1996-02-01" @default.
• W2080986992 modified "2023-10-17" @default.
• W2080986992 title "DIFFERENTIAL EFFECTS OF COSTIMULATOR SIGNALS AND INTERLEUKIN-2 ON T CELL RECEPTOR-MEDIATED CELL DEATH OF RESTING AND ACTIVATED CD4+ MURINE SPLENIC T CELLS1" @default.
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• W2080986992 doi "https://doi.org/10.1097/00007890-199602150-00029" @default.
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