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Journal Article
Research Support, Non-U.S. Gov't
Homeostatic regulation of CD8+ T cells after antigen challenge in the absence of Fas (CD95).
European Journal of Immunology 1996 December
The role of Fas in the homeostatic regulation of CD8+ T cells after antigen challenge was analyzed in the murine model of lymphocytic choriomeningitis virus (LCMV) infection. Mice homozygous for the lpr mutation and carrying T cell receptor (TCR) alphabeta transgenes specific for the LCMV glycoprotein peptide aa 33-41 in the context of H-2Db were used. Five main results emerged: first, development of lymphadenopathy and of CD4- CD8- double-negative B220+ T cells in lpr mice was not inhibited by the alphabeta TCR transgenes; second, tolerance induction and peripheral deletion of CD8+ T cells induced by LCMV glycoprotein peptide injection was independent of Fas expression; third, clonal down-regulation of Fas-deficient TCR-transgenic CD8+ T cells after acute LCM virus infection was identical to the decline of transgenic T cells expressing Fas; fourth, in vivo activated CD8+ effector T cells from TCR transgenic and TCR-lpr/lpr mice were equally susceptible to activation-induced cell death in vitro; and fifth, transgenic effector T cells from lpr/lpr mice were cleared in the declining phase of the immune response in vivo without giving rise to CD4- CD8- double-negative T cells. Taken together, these data suggest that the homeostatic regulation of CD8+ T cells after antigen challenge in vivo is regulated by mechanisms that do not require Fas.
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