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Departments of
*
Medicine and
Microbiology and Center for Immunology, University of Minnesota Medical School, Minneapolis, MN 55455
CD4+ T cells that undergo multiple rounds of cell division during primary Ag challenge in vivo produce IL-2 on secondary Ag rechallenge, whereas cells that fail to progress through the cell cycle are anergic to restimulation. Anti-CTLA-4 mAb treatment during primary Ag exposure increases cell cycle progression and enhances recall Ag responsiveness; however, simultaneous treatment with rapamycin, an inhibitor of the mammalian target of rapamycin and potent antiproliferative agent, prevents both effects. The data suggest that cell cycle progression plays a primary role in the regulation of recall Ag responsiveness in CD4+ T cells in vivo. CTLA-4 molecules promote clonal anergy development only indirectly by limiting cell cycle progression during the primary response.
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