Cutting Edge: Ikaros is a Regulator of Th2 Cell Differentiation

Overview

Journal J Immunol

Specialty Allergy & Immunology

Date 2009 Jan 7

PMID 19124715

Citations 42

Authors

Mary R Quirion

Gregory D Gregory

Sarah E Umetsu

Susan Winandy

Melissa A Brown

Affiliations

Soon will be listed here.

Abstract

Ikaros, a hematopoietic transcription factor, has well defined effects on early lymphocyte development in the bone marrow and thymus. In this study we demonstrate that Ikaros is a positive regulator of Th2 cytokine gene expression in peripheral T cells. CD4+ T cells from naive Ikaros(null) mice cultured under Th2-skewing conditions express the Th1 cytokine IFN-gamma and have reduced IL-4, IL-5, and IL-13 expression. Ikaros directly associates with several Th2 locus regulatory regions in naive CD4+ T cells. The decreased ability to express Th2 cytokines in Ikaros(null)T cells corresponds with histone 3 hypoacetylation across the Th2 cytokine locus as well as decreased GATA3 and cMaf and increased T-bet and STAT1 expression. These data support a model whereby Ikaros directly activates Th2 gene expression by promoting local chromatin accessibility during CD4+ T cell differentiation and also acts indirectly to regulate expression of Th2- and Th1-specific transcription factors.

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