title: Cutting edge: OX40 inhibits TGF-beta- and antigen-driven conversion of naive CD4 T cells into CD25+Foxp3+ T cells.
abstract: Naive CD4 T cells can develop into regulatory T cells by acquiring the transcription factor Foxp3. Combined signals from the TCR, CD28, IL-2R, and TGF-beta R promote Foxp3 expression in activated naive CD25(-) CD4 T cells. Here we show that OX40 (CD134) signaling inhibits TGF-beta-driven Foxp3 mRNA and suppresses the conversion of naive Ag-specific transgenic CD4 T cells into CD25(+)Foxp3(+) T cells. These data identify OX40 as a negative regulator of Foxp3 and suggest that OX40 can concomitantly promote effector T cell generation while antagonizing the differentiation of adaptive Foxp3(+) regulatory T cells.
authors.affiliation: Division of Molecular Immunology, La Jolla Institute for Allergy and Immunology, La Jolla, CA 92037, USA.
authors.forename: Takanori
authors.initials: T
authors.lastname: So
authors.forename: Michael
authors.initials: M
authors.lastname: Croft
mesh_terms: D000818:Animals; D000941:Antigens / Q000502:physiology*; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology* / Q000276:immunology* / Q000378:metabolism; D002454:Cell Differentiation / Q000276:immunology; D002478:Cells, Cultured; D051858:Forkhead Transcription Factors / Q000037:antagonists & inhibitors / Q000096:biosynthesis; D006131:Growth Inhibitors / Q000502:physiology*; D006801:Humans; D053645:Interleukin-2 Receptor alpha Subunit / Q000037:antagonists & inhibitors / Q000096:biosynthesis; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D053262:Receptors, OX40 / Q000502:physiology*; D016192:Resting Phase, Cell Cycle / Q000276:immunology; D015398:Signal Transduction / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000166:cytology* / Q000276:immunology* / Q000378:metabolism; D016212:Transforming Growth Factor beta / Q000037:antagonists & inhibitors* / Q000502:physiology
chemical_list: D000941:Antigens; D051858:Forkhead Transcription Factors; C498833:Foxp3 protein, mouse; D006131:Growth Inhibitors; D053645:Interleukin-2 Receptor alpha Subunit; D053262:Receptors, OX40; C505717:Tnfrsf4 protein, mouse; D016212:Transforming Growth Factor beta