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The Journal of Immunology, Vol 157, Issue 9 3909-3917, Copyright © 1996 by American Association of Immunologists


ARTICLES

CD28/B7 interactions deliver a unique signal to naive T cells that regulates cell survival but not early proliferation

AI Sperling, JA Auger, BD Ehst, IC Rulifson, CB Thompson and JA Bluestone
Ben May Institute, University of Chicago, IL 60637, USA.

CD28/B7 ligation provides costimulatory signals important for the development of T cell responses. In the present study, we examined whether CD28/B7 interactions have a specialized role in the regulation of cell cycle progression and sustained T cell proliferative responses in naive T cell populations using TCR transgenic mice. CD28-mediated signaling was shown to be uniquely capable of regulating cell survival compared with TCR-mediated signaling. Increasing the strength of the TCR-mediated signal 1 increased early proliferative responses, but had no effect on sustained cell survival. In contrast, CD28 ligation, signal 2, was not required for early proliferative responses, but dramatically influenced long term T cell survival. The increased cell survival after CD28 ligation was not due to increased IL-2 production, but was linked to up-regulation of Bcl-xL. The Bcl-xL protein could not be induced following increased TCR cross-linking in the absence of CD28 signaling. In addition, survival of T cells from Bcl-xL transgenic mice was not inhibited by blocking CD28 ligation, suggesting that CD28- induced T cell survival is regulated by Bcl-xL expression. Together, these results suggest that the unique role of CD28 signaling is not to costimulate the initial activation of naive T cells, but is, in fact, to sustain the late proliferative response and enhance long term cell survival.


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