PMID: 9164960Jun 1, 1997Paper

Ultraviolet light suppresses IFN-gamma-induced IL-7 gene expression in murine keratinocytes by interfering with IFN regulatory factors

The Journal of Immunology : Official Journal of the American Association of Immunologists
Y AraganeT Schwarz

Abstract

UV light is a potent stimulus for keratinocytes to release several cytokines. Recently, UV light was shown to inhibit keratinocyte release of IL-7, a growth factor for dendritic epidermal T cells. Since to date IL-7 is the only keratinocyte-derived cytokine down-regulated by UV light, we addressed the molecular mechanisms involved. IFN-gamma treatment of the murine keratinocyte cell line Pam 212 resulted in an up-regulation of IL-7 mRNA, while IL-7 transcripts were suppressed in cells exposed to UV before IFN-gamma. Because IFN-gamma induces IL-7 via activation of an IFN-stimulated response element (ISRE) located in the 5' upstream region of the IL-7 gene, bandshift assays were performed using the ISRE sequence from the IL-7 gene. Nuclear extracts from untreated cells revealed two bands, a slower migrating band identified by supershift analysis as IFN regulatory factor-2 (IRF-2), a transcriptional repressor, and a more rapidly migrating band identified as IRF-1, a transcriptional activator. IFN-gamma significantly induced IRF-1 binding, whereas UV treatment plus IFN-gamma decreased IRF-1 binding, suggesting that UV light suppresses IFN-gamma-induced expression of IL-7 by interfering with IRF-1. Chloramphenicol transferase assay...Continue Reading

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