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Analysis of the c-KIT Ligand Promoter Using Chromatin Immunoprecipitation
Published on: June 27, 2017
GATA-3 suppresses IFN-gamma promoter activity independently of binding to cis-regulatory elements
Osamu Kaminuma1, Fujiko Kitamura, Noriko Kitamura
1Department of Immunology, The Tokyo Metropolitan Institute of Medical Science, 3-18-22, Honkomagome, Bunkyo-ku, Tokyo 113-8613, Japan.
Abstract:
The regulatory mechanism by which GATA-3 suppresses IFN-gamma gene expression was investigated. A reduction of GATA-3 using RNA interference technology enhanced, whereas overexpression of GATA-3 suppressed IFN-gamma mRNA expression. IL-4 expression was reciprocally affected by GATA-3. GATA-3-mediated down-regulation of IFN-gamma was achieved through the inhibition of its promoter/enhancer activity. Two GATA elements located in the cis-regulatory elements did not contribute to the suppression of IFN-gamma promoter activity, even though they behaved as binding sites for GATA-3. The effect of GATA-3 on IFN-gamma promoter was lost upon removal of the region encompassing -257 to -172. Among several transcription factors putatively interacting with this region, Stat4, which enhanced IFN-gamma promoter activity, was down-regulated by GATA-3 at gene transcription level. Although GATA-3 has the capacity to interact with the cis-regulatory elements, it suppresses IFN-gamma gene transcription via down-regulation of Stat4.
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