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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Antagonistic roles for CTLA-4 and the mammalian target of rapamycin in the regulation of clonal anergy: enhanced cell cycle progression promotes recall antigen responsiveness.

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.[1]


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