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Attenuation of TCR-induced transcription by Bach2 controls regulatory T cell differentiation and homeostasis
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Journal Article
Attenuation of TCR-induced transcription by Bach2 controls regulatory T cell differentiation and homeostasis
2020
Overview
Differentiation and homeostasis of Foxp3
+
regulatory T (Treg) cells are strictly controlled by T-cell receptor (TCR) signals; however, molecular mechanisms that govern these processes are incompletely understood. Here we show that Bach2 is an important regulator of Treg cell differentiation and homeostasis downstream of TCR signaling. Bach2 prevents premature differentiation of fully suppressive effector Treg (eTreg) cells, limits IL-10 production and is required for the development of peripherally induced Treg (pTreg) cells in the gastrointestinal tract. Bach2 attenuates TCR signaling-induced IRF4-dependent Treg cell differentiation. Deletion of IRF4 promotes inducible Treg cell differentiation and rescues pTreg cell differentiation in the absence of Bach2. In turn, loss of Bach2 normalizes eTreg cell differentiation of IRF4-deficient Treg cells. Mechanistically, Bach2 counteracts the DNA-binding activity of IRF4 and limits chromatin accessibility, thereby attenuating IRF4-dependent transcription. Thus, Bach2 balances TCR signaling induced transcriptional activity of IRF4 to maintain homeostasis of thymically-derived and peripherally-derived Treg cells.
The transcription factor Bach2 is critical for T cell differentiation, but how it functions in Treg cells is unclear. Here the authors use a Treg-specific mouse model to show that Bach2 controls homeostasis and function of Treg cells by limiting DNA accessibility and activity of IRF4 in response to TCR signaling.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 38/23
/ 38/39
/ 38/91
/ Animals
/ Basic-Leucine Zipper Transcription Factors - deficiency
/ Basic-Leucine Zipper Transcription Factors - metabolism
/ Cell Differentiation - immunology
/ DNA
/ Epigenesis, Genetic - immunology
/ Forkhead Transcription Factors - metabolism
/ Gastrointestinal Tract - immunology
/ Gene Expression Regulation - immunology
/ Humanities and Social Sciences
/ Interferon regulatory factor 4
/ Interferon Regulatory Factors - deficiency
/ Interferon Regulatory Factors - metabolism
/ Interleukin-10 - biosynthesis
/ Mice
/ Receptors, Antigen, T-Cell - metabolism
/ Science
/ Signal Transduction - immunology
/ T-Lymphocyte Subsets - immunology
/ T-Lymphocyte Subsets - metabolism
