title: Effect of interleukin-10 on the gene expression of type I collagen, fibronectin, and decorin in human skin fibroblasts: differential regulation by transforming growth factor-beta and monocyte chemoattractant protein-1.
abstract: Interleukin-10 (IL-10) is a cytokine with many regulatory functions. In particular, IL-10 exerts neutralizing effect on other cytokines, and therefore IL-10 is thought to have important therapeutic implications. Recent reports suggest that IL-10 regulates not only immunocytes but also collagen and collagenase gene expression in fibroblasts. In this study, we investigated the effect of IL-10 on gene expression of extracellular matrix (ECM) proteins, such as type I collagen, fibronectin, and decorin, in human skin fibroblasts. Results of Northern blot analysis showed that both collagen I and fibronectin mRNAs were downregulated, while decorin gene expression was enhanced by IL-10 (10 ng/ml) time-dependently (6-24 h). alpha1(I) collagen and fibronectin mRNAs were decreased to one-third and one-fourth, respectively, by 50 ng/ml IL-10, whereas decorin mRNA was increased up to 2.7-fold by 50 ng/ml IL-10. Response to IL-10 by scleroderma fibroblasts was similar to that in normal dermal fibroblasts, with decreased expression levels of collagen and fibronectin and induced decorin mRNA levels. Transforming growth factor-beta (TGF-beta) is a crucial fibrogenic cytokine which upregulates the mRNA expression of collagen and fibronectin, whereas it downregulates decorin mRNA expression in fibroblasts. Monocyte chemoattractant protein-1 (MCP-1) has recently been shown to upregulate the type I collagen mRNA expression in cultured fibroblasts. We therefore examined whether IL-10 alters gene expression of ECM elicited by TGF-beta and MCP-1. Our results demonstrated that IL-10 downregulated the TGF-beta-elicited increase of mRNA expression of type I collagen and fibronectin, while partially recovering TGF-beta-elicited decrease of decorin expression in normal skin fibroblasts. By contrast, IL-10 did not alter the MCP-1-elicited upregulation of mRNA expression of either alpha1(I) collagen and decorin. Our data indicate that IL-10 differentially regulates TGF-beta and MCP-1 in the modulation of ECM proteins and therefore suggest that IL-10 plays a role in the regulation of tissue remodeling.
authors.affiliation: Department of Dermatology, University of Cologne, Joseph-Stelzmann Strasse 9, Cologne, 50924, Germany. yamamoto.derm@med.tmd.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Yamamoto
authors.forename: B
authors.initials: B
authors.lastname: Eckes
authors.forename: T
authors.initials: T
authors.lastname: Krieg
mesh_terms: D015152:Blotting, Northern; D002478:Cells, Cultured; D018932:Chemokine CCL2 / Q000378:metabolism*; D003094:Collagen / Q000096:biosynthesis*; D058575:Decorin; D004305:Dose-Response Relationship, Drug; D015536:Down-Regulation; D005109:Extracellular Matrix / Q000378:metabolism; D016326:Extracellular Matrix Proteins; D005347:Fibroblasts / Q000378:metabolism*; D005353:Fibronectins / Q000096:biosynthesis*; D005786:Gene Expression Regulation / Q000187:drug effects*; D006801:Humans; D016753:Interleukin-10 / Q000494:pharmacology*; D011509:Proteoglycans / Q000096:biosynthesis*; D012333:RNA, Messenger / Q000378:metabolism; D012594:Scleroderma, Localized / Q000378:metabolism; D012867:Skin / Q000378:metabolism*; D013997:Time Factors; D016212:Transforming Growth Factor beta / Q000378:metabolism*; D015854:Up-Regulation
chemical_list: D018932:Chemokine CCL2; C546878:DCN protein, human; D058575:Decorin; D016326:Extracellular Matrix Proteins; D005353:Fibronectins; D011509:Proteoglycans; D012333:RNA, Messenger; D016212:Transforming Growth Factor beta; D016753:Interleukin-10; D003094:Collagen