OX40/OX40L costimulation affects induction of Foxp3+ regulatory T cells in part by expanding memory T cells in vivo

The Journal of Immunology : Official Journal of the American Association of Immunologists
Xiang XiaoXian Chang Li

Abstract

OX40 is a member of the TNFR superfamily and has potent T cell costimulatory activities. OX40 also inhibits the induction of Foxp3(+) regulatory T cells (Tregs) from T effector cells, but the precise mechanism of such inhibition remains unknown. In the present study, we found that CD4(+) T effector cells from OX40 ligand-transgenic (OX40Ltg) mice are highly resistant to TGF-beta mediated induction of Foxp3(+) Tregs, whereas wild-type B6 and OX40 knockout CD4(+) T effector cells can be readily converted to Foxp3(+) T cells. We also found that CD4(+) T effector cells from OX40Ltg mice are heterogeneous and contain a large population of CD44(high)CD62L(-) memory T cells. Analysis of purified OX40Ltg naive and memory CD4(+) T effector cells showed that memory CD4(+) T cells not only resist the induction of Foxp3(+) T cells but also actively suppress the conversion of naive CD4(+) T effector cells to Foxp3(+) Tregs. This suppression is mediated by the production of IFN-gamma by memory T cells but not by cell-cell contact and also involves the induction of T-bet. Importantly, memory CD4(+) T cells have a broad impact on the induction of Foxp3(+) Tregs regardless of their origins and Ag specificities. Our data suggest that one of the ...Continue Reading

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The Journal of Immunology : Official Journal of the American Association of Immunologists
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