OX40 costimulation turns off Foxp3+ Tregs

Minh Diem Vu, Xiang Xiao, Wenda Gao, Nicolas Degauque, Ming Chen, Alexander Kroemer, Nigel Killeen, Naoto Ishii, Xian Chang Li

Research output: Contribution to journalArticlepeer-review

342 Scopus citations


OX40 is a recently identified T-cell costimulatory molecule that belongs to the TNF/TNFR superfamily. OX40 can be expressed by both activated T effector cells and Foxp3 + Tregs. It is well known that OX40 delivers a potent costimulatory signal to T effector cells, but very little is known about the role of OX40 in regulating the suppressor properties of Foxp3 + Tregs and the de novo generation of new inducible Foxp3 + Tregs from T effector cells. In the present study, we found, by using a newly created foxp3gfp knockin model, that OX40 was dispensable for the genesis and suppressor functions of naturally arising CD4 +Foxp3 + Tregs, but stimulating OX40 on the Foxp + Tregs abrogated their ability to suppress T effector cell proliferation, IFN-γ production, and T effector cell-mediated allograft rejection. OX40 costimulation did not signifi-cantly affect proliferation and survival of the naturally arising Foxp3 + Tregs, but profoundly inhibited Foxp3 gene expression. Importantly, OX40 costimulation to T effector cells prevented the induction of new inducible Foxp3 + Tregs from T effector cells. Our study identified OX40 as a key negative regulator of Foxp3 + Tregs and may have important clinical implications in models of transplantation and autoimmunity.

Original languageEnglish (US)
Pages (from-to)2501-2510
Number of pages10
Issue number7
StatePublished - Oct 1 2007

ASJC Scopus subject areas

  • Biochemistry
  • Immunology
  • Hematology
  • Cell Biology


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