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CD8
Cells and Interferon
By

From the * Trudeau Institute, Saranac Lake, New York 12983; and Bacterial superantigens induce peripheral unresponsiveness in CD4+ T cell populations that express appropriate V
Cancer Center, University of
California at San Diego, La Jolla, California 92093
chains. We have used V
3/V
11 T cell receptor transgenic (Tg) mice
and the V
3-specific superantigen staphylococcal enterotoxin A (SEA) to further investigate the mechanisms that contribute to such unresponsiveness. As in other models, in vivo exposure
to SEA rendered the Tg CD4+ cells unresponsive to subsequent restimulation in vitro with antigen or mitogens. However, when the SEA-treated CD4+ cells were completely purified
away from all other contaminating cells, they regained the ability to proliferate and secrete cytokines. Moreover, enriched CD4
CD8
cells from the SEA-treated mice suppressed the responses of fresh control CD4+ cells in mixed cultures indicating that the apparent "anergy" was
both transferable and reversible. Further analysis demonstrated that interferon
, but not the
Fas receptor, played a critical role in the suppression.
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