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- W2498260444 abstract "We investigated the effect of endothelin-1 (ET-1) in normal and systemic sclerosis (SSc) dermal fibroblasts. Collagen type I, collagen type III, and MMP-1 levels in culture supernatants were measured by competition ELISA and cellular mRNA expression was examined by Northern blotting. Mitogenic responses to ET-1 were assessed by [3H]TdR incorporation. ET receptor mRNA expression was examined by RT-PCR analysis of fibroblast RNA and with surface binding studies using radiolabeled ET receptor ligands and specific receptor antagonists. ET-1 enhanced release of collagen types I and III by control and SSc fibroblast strains, but the effects were significantly greater for control cells (p < 0.05). This effect appeared to involve both ETA and ETB receptor subtypes. SSc fibroblasts demonstrated lower constitutive MMP-1 production than control fibroblasts (p < 0.01), but ET-1 treatment decreased MMP-1 in normal fibroblasts to levels observed in SSc. Mitogenic response (percent control [3H]TdR incorporation) to ET-1 for SSc fibroblasts was 130 +/- 34, significantly less (p < 0.01) than that for normal fibroblasts strains (290 +/- 25). This response appeared to be predominantly mediated via the ETA receptor subtype. Surface binding studies suggested a significantly lower level of ETA binding sites in SSc compared with normal fibroblasts (p < 0.05). These data suggest that ET-1 induces a fibrogenic phenotype in normal dermal fibroblasts that resembles that seen in fibroblasts grown from lesional SSc skin. Moreover, SSc cells appear to be refractory to these effects, and this reduced responsiveness is associated with an altered ratio of ETA:ETB receptor expression, supporting a role for ET-1 in the fibrotic pathology of SSc" @default.
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- W2498260444 date "1998-01-01" @default.
- W2498260444 modified "2023-09-27" @default.
- W2498260444 title "Endothelins: effect on matrix biosynthesis and proliferation in normal and scleroderma fibroblasts" @default.
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