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• W2072922969 abstract "IL-20 is a novel member of the IL-10 cytokine family with pleiotropic effects. Current knowledge of what triggers and regulates IL-20 gene expression is sparse. The aim of this study was to investigate the regulation of IL-20 expression in cultured normal human keratinocytes. The expression of IL-20 was rapidly induced by proinflammatory stimuli, in particular IL-1β, IL-6, and UVB irradiation. Using kinase inhibitors and small-interfering RNA, we discovered that the p38 mitogen-activated protein kinase (MAPK) as well as inhibitory κB kinase -NF-κB signaling pathways are crucial for IL-20 expression. By electrophoretic mobility shift assay two κB-binding sites were identified upstream from the start codon in the IL-20 gene. Supershift analysis revealed binding of the p50/p65 heterodimer. Furthermore, the p38 MAPK was shown to exert its effects on IL-20 expression through activation of the downstream kinase mitogen- and stress-activated kinase 1 (MSK1), indicating transactivation of NF-κB driven IL-20 messenger RNA transcription as an important mechanism of action. IL-20 is assumed to be a key cytokine in the pathogenesis of psoriasis and possibly cancer, and therefore the p38 MAPK, MSK1, and NF-κB may be important new molecular targets for the modulation of IL-20 expression in these diseases. IL-20 is a novel member of the IL-10 cytokine family with pleiotropic effects. Current knowledge of what triggers and regulates IL-20 gene expression is sparse. The aim of this study was to investigate the regulation of IL-20 expression in cultured normal human keratinocytes. The expression of IL-20 was rapidly induced by proinflammatory stimuli, in particular IL-1β, IL-6, and UVB irradiation. Using kinase inhibitors and small-interfering RNA, we discovered that the p38 mitogen-activated protein kinase (MAPK) as well as inhibitory κB kinase -NF-κB signaling pathways are crucial for IL-20 expression. By electrophoretic mobility shift assay two κB-binding sites were identified upstream from the start codon in the IL-20 gene. Supershift analysis revealed binding of the p50/p65 heterodimer. Furthermore, the p38 MAPK was shown to exert its effects on IL-20 expression through activation of the downstream kinase mitogen- and stress-activated kinase 1 (MSK1), indicating transactivation of NF-κB driven IL-20 messenger RNA transcription as an important mechanism of action. IL-20 is assumed to be a key cytokine in the pathogenesis of psoriasis and possibly cancer, and therefore the p38 MAPK, MSK1, and NF-κB may be important new molecular targets for the modulation of IL-20 expression in these diseases. activating transcription factor 1 cAMP response element-binding protein electrophoretic mobility shift assay inhibitory κB-kinase messenger RNA mitogen-activated protein kinase MAPK kinase kinase 3 mitogen- and stress-activated kinase 1 normal human epidermal keratinocytes small-interfering RNA transforming growth factor-β-activated kinase" @default.
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• W2072922969 date "2007-06-01" @default.
• W2072922969 modified "2023-10-14" @default.
• W2072922969 title "IL-20 Gene Expression Is Induced by IL-1β through Mitogen-Activated Protein Kinase and NF-κB-Dependent Mechanisms" @default.
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• W2072922969 doi "https://doi.org/10.1038/sj.jid.5700713" @default.
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