CD28-mediated signaling in vivo prevents activation-induced apoptosis in the thymus and alters peripheral lymphocyte homeostasis

Y. Shi, L. G. Radvanyi, A. Sharma, P. Shaw, D. R. Green, R. G. Miller, G. B. Mills

    Research output: Contribution to journalArticle

    46 Scopus citations

    Abstract

    Activation of T lymphocytes can result in a functional immune response, anergy or apoptosis. Functional T cell activation requires the interaction of the TCR with Ag presented by MHC molecules on APC concurrent with appropriate interactions between cell surface accessory molecules. Interestingly, the level of CD28 expression is regulated during T cell development as well as during T cell activation and proliferation, suggesting that CD28 could play a role in determining the outcome of activation of TCR during T cell ontogeny. We identify, herein, a novel function of murine CD28 in the regulation of activation-induced apoptosis in thymocytes. In vivo, or combined in vivo and in vitro treatment with mAbs to CD28 prevents apoptosis of CD4+CD8+ thymocytes induced by Abs to the TCR complex. Prolonged administration of anti-CD28 Abs increased the number of both CD4+CD8- and CD4-CD8+ T cells in the thymus, while the number of CD4+CD8+ T cells is relatively unchanged. Furthermore, this treatment leads to a dramatic enlargement of peripheral lymphoid organs characterized primarily by the expansion of B cells. The number of CD4+CD8- T cells in the spleen of anti-CD28-treated mice is also moderately increased, while the number of CD4-CD8+ cells is relatively unchanged.

    Original languageEnglish (US)
    Pages (from-to)1829-1837
    Number of pages9
    JournalJournal of Immunology
    Volume155
    Issue number4
    StatePublished - Jan 1 1995

    ASJC Scopus subject areas

    • Immunology and Allergy
    • Immunology

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