Akt1-mediated Gata3 phosphorylation controls the repression of IFN? in memory-type Th2 cells.

ABSTRACT: Th2 cells produce Th2 cytokines such as IL-4, IL-5 and IL-13, but repress Th1 cytokine IFN?. Recent studies have revealed various distinct memory-type Th2 cell subsets, one of which produces a substantial amount of IFN? in addition to Th2 cytokines, however it remains unclear precisely how these Th2 cells produce IFN?. We herein show that phosphorylation of Gata3 at Ser308, Thr315 and Ser316 induces dissociation of a histone deacetylase Hdac2 from the Gata3/Chd4 repressive complex in Th2 cells. We also identify Akt1 as a Gata3-phosphorylating kinase, and the activation of Akt1 induces derepression of Tbx21 and Ifng expression in Th2 cells. Moreover, T-bet-dependent IFN? expression in IFN?-producing memory Th2 cells appears to be controlled by the phosphorylation status of Gata3 in human and murine systems. Thus, this study highlights the molecular basis for posttranslational modifications of Gata3 that control the regulation of IFN? expression in memory Th2 cells.

SUBMITTER: Hosokawa H 

PROVIDER: S-EPMC4829694 | biostudies-literature | 2016 Apr

REPOSITORIES: biostudies-literature