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The Journal of Immunology, 2005, 174: 2046-2053.
Copyright © 2005 by The American Association of Immunologists

Distinct Requirements for Deletion versus Anergy during CD8 T Cell Peripheral Tolerance In Vivo1

William L. Redmond2, Boris C. Marincek and Linda A. Sherman3

Department of Immunology, The Scripps Research Institute, La Jolla, CA 92037

Activation of naive T cells by quiescent APCs results in tolerance through deletion and anergy. The underlying basis for these distinct fates is unclear. Using clone 4 TCR transgenic animals as a source of naive CD8 T cells, we examined the requirements for peripheral deletion in vivo. Our results demonstrate that independent of the amount of Ag used for stimulation, a single dose was insufficient to achieve complete clonal deletion. Instead, further antigenic exposure was required to completely eliminate all of the activated T cells. Additionally, consecutive stimulations with low doses of Ag were highly effective in promoting deletion. In contrast, although stimulation with high doses of Ag initially led to the apoptosis of many of the activated T cells, it induced hyporesponsiveness in a portion of the responding cells, thereby sparing them from further activation and deletion. These data explain why some conditions promote tolerance through clonal deletion whereas others promote anergy. Furthermore, these data provide a framework to devise protocols for effective deletion of potentially autoreactive T cells.




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