Regulation of IL-1 family cytokines IL-1alpha, IL-1 receptor antagonist, and IL-18 by 1,25-dihydroxyvitamin D3 in primary keratinocytes

The Journal of Immunology : Official Journal of the American Association of Immunologists
Juan KongYan Chun Li

Abstract

IL-1 family cytokines are key mediators of inflammatory response. Excessive production of these cytokines by keratinocytes has been implicated in inflammatory and hyperproliferative skin diseases. Given the immunosuppressive role of 1,25-dihydroxyvitamin D(3) (1,25(OH)(2)D(3)) and its clinical application in treatment of psoriasis, we investigated the effect of 1,25(OH)(2)D(3) on the expression of IL-1alpha, intracellular IL-1 receptor antagonist (icIL-1Ra), and IL-18 in mouse primary keratinocytes. Treatment of keratinocytes with 1,25(OH)(2)D(3) increased the expression of IL-1alpha and icIL-1Ra and decreased the expression of IL-18 in dose- and time-dependent manners. The magnitude of icIL-1Ra induction was much greater than that of IL-1alpha so that the ratio of icIL-1Ra to IL-1alpha was markedly increased, leading to repression of IL-1 activity. The regulation of these three cytokines by 1,25(OH)(2)D(3) was mediated by vitamin D receptor (VDR), as 1,25(OH)(2)D(3) had no effect in VDR(-/-) keratinocytes, whereas the effect was restored in cells derived from VDR(-/-) mice expressing human VDR. 1,25(OH)(2)D(3) appeared to use different mechanisms to regulate the biosynthesis of IL-1alpha and icIL-1Ra: it increased IL-1alpha mR...Continue Reading

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