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Joller, Nicole; Lozano, Ester; Burkett, Patrick R.; Patel, Bonny; Xiao, Sheng; Zhu, Chen; Xia, Junrong; Tan, Tze G.; Sefik, Esen; Yajnik, Vijay; Sharpe, Arlene H.; Quintana, Francisco J.; Mathis, Diane; Benoist, Christophe; Hafler, David A.; Kuchroo, Vijay K.
Immunity (Cambridge, Mass.), 04/2014, Volume: 40, Issue: 4Journal Article
Foxp3+ T regulatory (Treg) cells regulate immune responses and maintain self-tolerance. Recent work shows that Treg cells are comprised of many subpopulations with specialized regulatory functions. Here we identified Foxp3+ T cells expressing the coinhibitory molecule TIGIT as a distinct Treg cell subset that specifically suppresses proinflammatory T helper 1 (Th1) and Th17 cell, but not Th2 cell responses. Transcriptional profiling characterized TIGIT+ Treg cells as an activated Treg cell subset with high expression of Treg signature genes. Ligation of TIGIT on Treg cells induced expression of the effector molecule fibrinogen-like protein 2 (Fgl2), which promoted Treg-cell-mediated suppression of T effector cell proliferation. In addition, Fgl2 was necessary to prevent suppression of Th2 cytokine production in a model of allergic airway inflammation. TIGIT expression therefore identifies a Treg cell subset that demonstrates selectivity for suppression of Th1 and Th17 cell but not Th2 cell responses. •TIGIT defines a distinct Foxp3+ Treg cell subset•TIGIT induces transcription and secretion of the effector molecule Fgl2 in Treg cells•TIGIT+ Treg cells suppress proinflammatory Th1 and Th17 not Th2 cell responses•Selective suppression by TIGIT+ Treg cells is Fgl2 dependent
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