Steroid nuclear receptor coactivator 2 controls immune tolerance by promoting induced Treg differentiation via upregulating Nr4a2

Purpose:Steroid nuclear receptor coactivator 2 (SRC2) is a member of family of transcription co-activators. While SRC1 inhibits the differentiation of regulatory T cells (Tregs) critical for establishing immune tolerance, we show here that SRC2 stimulates Treg differentiation. SRC2 is dispensable for the development of thymic Tregs, whereas naïve CD4+ T cells from mice deficient of SRC2 specific in Tregs (SRC2fl/fl/Foxp3YFP-Cre) display defective Treg differentiation. Furthermore, the aged SRC2fl/fl/Foxp3YFP-Cre mice spontaneously develop autoimmune phenotypes including enlarged spleen and lung inflammation infiltrated with IFN?-producing CD4+ T cells. SRC2fl/fl/Foxp3YFP-Cre mice also develop severer experimental autoimmune encephalomyelitis (EAE) due to reduced Tregs. Mechanically, SRC2 recruited by NFAT1 binds to the promoter and activates the expression of Nr4a2 which then stimulates Foxp3 expression to promote Treg differentiation. Members of SRC family co-activators thus play distinct roles in Treg differentiation and are potential drug targets for controlling immune tolerance Overall design: RNA-seq analysis was performed to detect the transcriptome of Foxp3YFP-Cre and SRC2fl/fl/Foxp3YFP-Cre CD4+ cells 36 hours post Treg polarization.