Mast cell IL-4 expression is regulated by Ikaros and influences encephalitogenic Th1 responses in EAE.

The Journal of Clinical Investigation
Gregory D GregoryMelissa A Brown

Abstract

When exposed to a pathogen, a naive CD4(+) T cell is forced to make a cell fate decision that leads to a polarized population of Th1 IFN-gamma- or Th2 IL-4- producing cells. Although IL-4 has traditionally been considered a factor that promotes Th2 cell differentiation, recent evidence has demonstrated that the site and timing of IL-4 expression in an immune response determines its ultimate effects on CD4(+) T cell fate. Using a mast cell (MC) reconstitution model, we demonstrate that MC-derived IL-4 promoted Th1 responses in vivo. Furthermore, MCs from genetically disparate mouse strains varied in their potential for IL-4 expression. Independent of the activation mode, MCs from Th1-prone C57BL/6 mice exhibited a more robust Il4 response than did the Th2-prone strain Balb/c. The hierarchy of IL-4 expression potential was directly associated with the degree of basal chromatin accessibility at cis-regulatory elements conserved noncoding sequence-1 and V(A) enhancer within the Th2 locus. GATA1/2 and Ikaros, factors with opposing roles in chromatin remodeling, acted at these sites. We propose that GATA and Ikaros proteins coordinately fine-tune accessibility at the Il4 locus during development to variably regulate IL-4 expression. ...Continue Reading

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Methods Mentioned

BETA
histone acetylation
histone
immunoprecipitation
PCR
acetylation
ChIP
flow cytometry

Software Mentioned

GraphPad Prism
ImageQuant

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