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  • Title: IL-18 downregulates collagen production in human dermal fibroblasts via the ERK pathway.
    Author: Kim HJ, Song SB, Choi JM, Kim KM, Cho BK, Cho DH, Park HJ.
    Journal: J Invest Dermatol; 2010 Mar; 130(3):706-15. PubMed ID: 19865096.
    Abstract:
    Excessive accumulation of collagen contributes to the fibrotic process. Several experimental studies have shown that IFN-gamma is effective in preventing fibrogenesis. IL-18, originally identified as an IFN-gamma-inducing factor, is a key mediator of inflammation and host defense responses. In this study, we investigated the regulatory effect of IL-18 on the expression of type I and III collagen genes in dermal fibroblasts. The exposure of human dermal fibroblasts (HDFs) to IL-18 resulted in a reduction of collagen gene expression and production. Also, IL-18 inhibited the fibrogenic cytokine transforming growth factor (TGF)-beta-induced collagen gene expression. Next, to determine the molecular mechanism involved in this regulation, we showed that IL-18-regulated collagen expression was blocked by small interfering RNA (siRNA)-mediated Ets-1 knockdown. Furthermore, we showed that IL-18 induced phosphorylation of extracellular signal-regulated kinase (ERK) within 10 minutes and that the ERK inhibitor PD98059 blocked the inhibitory effect of IL-18. IL-18 also inhibited the production of collagen in systemic sclerosis (SSc) dermal fibroblasts. Our data indicate that IL-18 downregulates collagen production in HDF directly via Ets-1 and the ERK pathway, suggesting that IL-18 may exert antifibrotic activities in dermal fibroblasts.
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