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* Department of Biomedical Sciences, College of Medicine, University of Illinois, Rockford, IL 61107; and
State Key Laboratories for AgroBiotechnology, China Agricultural University, Beijing, China
The thymus-derived CD4+CD25+ T cells belong to a subset of regulatory T cells potentially capable of suppressing the proliferation of pathogenic effector T cells. Intriguingly, these suppressor cells are themselves anergic, proliferating poorly to mitogenic stimulation in culture. In this study, we find that the 4-1BB costimulator receptor, best known for promoting the proliferation and survival of CD8+ T cells, also induces the proliferation of the CD4+CD25+ regulatory T cells both in culture and in vivo. The proliferating CD4+CD25+ T cells produce no detectable IL-2, suggesting that 4-1BB costimulation of these cells does not involve IL-2 production. The 4-1BB-expanded CD4+CD25+ T cells are functional, as they remain suppressive to other T cells in coculture. These results support the notion that the peripheral expansion of the CD4+CD25+ T cells is controlled in part by costimulation.
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