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Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.
Role of NFAT proteins in IL13 gene transcription in mast cells.
Journal of Biological Chemistry 2004 August 28
Th2 and mast cells are participants in the asthmatic response to allergens, and both cell types produce the cytokines interleukin (IL)-4 and IL-13. IL-13 in particular is both necessary and sufficient for experimental models of asthma. The transcription factor NFAT plays a central role in cytokine transcriptional regulation in both cell types. Here, we analyze the molecular basis of IL13 gene transcription in Th2 and mast cells. We show that NFAT1 is the major NFAT protein involved in regulating IL13 transcription in mast cells. Although NFAT2 is correctly expressed and regulated in mast cells, it does not contribute to IL13 gene transcription as shown by analysis of cells lacking NFAT2 and cells expressing a constitutively active version of NFAT2. The difference between NFAT1 and NFAT2 appears to be due to a preferential synergistic interaction of NFAT1 with GATA proteins at the IL13 promoter. We suggest that mast cells lack a co-activator protein that stabilizes the binding of NFAT2 to the IL13 promoter by interacting either with NFAT2 itself or with a DNA-bound complex of NFAT2 and GATA proteins.
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