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  • Title: Notch-Hes1 pathway is required for the development of IL-17-producing γδ T cells.
    Author: Shibata K, Yamada H, Sato T, Dejima T, Nakamura M, Ikawa T, Hara H, Yamasaki S, Kageyama R, Iwakura Y, Kawamoto H, Toh H, Yoshikai Y.
    Journal: Blood; 2011 Jul 21; 118(3):586-93. PubMed ID: 21606479.
    Abstract:
    Unlike conventional T cells, which are exported from the thymus as naive cells and acquire effector functions upon antigen encounter in the periphery, a subset of γδ T cells differentiates into effectors that produce IL-17 within the fetal thymus. We demonstrate here that intrathymic development of the naturally occurring IL-17-producing γδ T cells is independent of STAT3 and partly dependent on RORγt. Comparative gene-expression analysis identified Hes1, one of the basic helix-loop-helix proteins involved in Notch signaling, as a factor specifically expressed in IL-17-producing γδ T cells. Hes1 is critically involved in the development of IL-17-producing γδ T cells, as evidenced by their severe decrease in the thymi of Hes1-deficient fetal mice. Delta-like 4 (Dll4)-expressing stromal cells support the development of IL-17-producing γδ T cells in vitro. In addition, conditional Hes1 ablation in peripheral γδ T cells decreases their IL-17 production but not their IFN-γ production. These results reveal a unique differentiation pathway of IL-17-producing γδ T cells.
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