Journal
JOURNAL OF IMMUNOLOGY
Volume 178, Issue 12, Pages 7694-7702Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.178.12.7694
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Funding
- NCI NIH HHS [CA 81383] Funding Source: Medline
- NHLBI NIH HHS [T32 HL 007781] Funding Source: Medline
- NIAID NIH HHS [AI 50823] Funding Source: Medline
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Ag-specific CD4 T cells transferred into unirradiated Ag-bearing recipients proliferate, but survival and accumulation of proliferating cells is not extensive and the donor cells do not acquire effector functions. We previously showed that a single costimulatory signal delivered by an agonist Ab to OX40 (CD134) promotes accumulation of proliferating cells and promotes differentiation to effector CD4 T cells capable of secreting IFN-gamma. In this study, we determined whether OX40 costimulation requires supporting costimulatory or differentiation signals to drive acquisition of effector T cell function. We report that OX40 engagement drives effector T cell differentiation in the absence of CD28 and CD40 signals. Two important regulators of Th1 differentiation, IL-12R and T-bet, also are not required for acquisition of effector function in CD4 T cells responsive to OX40 stimulation. Finally, we show that CD25-deficient CD4 T cells produce little IFN-gamma in the presence of OX40 costimulation compared with wild type, suggesting that IL-2R signaling is required for efficient OX40-mediated differentiation to IFN-gamma secretion.
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