GITR subverts Foxp3+ Tregs to boost Th9 immunity through regulation of histone acetylation

Xiang Xiao,Xiaoming Shi,Yihui Fan,Xiaolong Zhang,Minhao Wu,Peixiang Lan,L. Minze,yang-xin fu,R. Ghobrial,Wentao Liu,X. Li

Published 2015 in Nature Communications

ABSTRACT

Glucocorticoid-induced TNFR-related protein (GITR) is a costimulatory molecule with diverse effects on effector T cells and regulatory T cells (Tregs), but the underlying mechanism remains poorly defined. Here we demonstrate that GITR ligation subverts the induction of Foxp3+ Tregs and directs the activated CD4+ T cells to Th9 cells. Such GITR-mediated iTreg to Th9 induction enhances anti-tumour immunity in vivo. Mechanistically, GITR upregulates the NF-κB family member p50, which recruits histone deacetylases to the Foxp3 locus to produce a ‘closed’ chromatin structure. Furthermore, GITR ligation also activates STAT6, and STAT6 renders Il9 locus accessible via recruitment of histone acetyltransferase p300, and together with inhibition of Foxp3, GITR induces strong Th9 responses. Thus, Th9 cells and iTregs are developmentally linked and GITR can subvert tolerogenic conditions to boost Th9 immunity. Glucocorticoid-induced TNFR-related protein (GITR), a costimulatory protein expressed by T cells, has immunostimulatory effect but the underlying mechanism is not clear. Here the authors show that GITR ligation inhibits the induction of Foxp3 expression and diverts CD4 T cells towards Th9 differentiation instead of iTreg.

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