IL-22 regulates the expression of genes responsible for antimicrobial defense, cellular differentiation, and mobility in keratinocytes: a potential role in psoriasis

European Journal of Immunology
Kerstin WolkRobert Sabat

Abstract

IL-22 is an IFN-IL-10 cytokine family member, which is produced by activated Th1 and NK cells and acts primarily on epithelial cells. Here we demonstrate that IL-22, in contrast to its relative IFN-gamma, regulates the expression of only a few genes in keratinocytes. This is due to varied signal transduction. Gene expressions regulated by IL-22 should enhance antimicrobial defense [psoriasin (S100A7), calgranulin A (S100A8), calgranulin B (S100A9)], inhibit cellular differentiation (e.g., profilaggrin, keratins 1 and 10, kallikrein 7), and increase cellular mobility [e.g., matrix metalloproteinease 1 (MMP1, collagenase 1), MMP3 (stromelysin 1), desmocollin 1]. In contrast, IFN-gamma favored the expression of MHC pathway molecules, adhesion molecules, cytokines, chemokines, and their receptors. The IL-22 effects were transcriptional and either independent of protein synthesis and secretion, or mediated by a secreted protein. Inflammatory conditions, but not keratinocyte differentiation, amplified the IL-22 effects. IL-22 application in mice enhanced cutaneous S100A9 and MMP1 expression. High IL-22 levels in psoriatic skin were associated with strongly up-regulated cutaneous S100A7, S100A8, S100A9, and MMP1 expression. Psoriatic ...Continue Reading

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