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• W1998396597 abstract "Leukotriene C4 (LTC4), a mediator generated by a variety of inflammatory cells, participates in several physiological and pathological processes. It has been shown that LTC4 stimulates collagen synthesis by fibroblasts, suggesting a role in collagen turnover. However, the possible effect of this mediator on collagen degradation has not been examined. In this study we explored the role of LTC4 in the modulation of fibroblast interstitial collagenase and TIMP-1. Confluent cultures of three human normal lung fibroblast cell lines, and one derived from idiopathic pulmonary fibrosis (IPF) were exposed to LTC4 0.1, 1 and 10 nM, and to IL-1 beta as positive control. Collagenase and TIMP mRNAs expression were analyzed by Northern blot followed by densitometric scanning. Immunoreactive procollagenase was detected by immunoblot, and collagenase activity was measured using [3H]collagen. Our results showed that LTC4 enhanced several-fold collagenase mRNA expression in collagenase-producing fibroblasts, and induced the expression of the enzyme mRNA in collagenase-nonproducing fibroblasts, both in normal and IPF derived cell lines. LTC4 1 nM induced the highest response. Collagenolytic activity and immunoreactive collagenase paralleled collagenase mRNA expression. Interestingly, simultaneous exposure of fibroblasts to LTC4 plus IL-1 failed to show additive effects. Moreover, in two cell lines the combination resulted in a decrease of collagenase mRNA expression compared with both mediators separately. TIMP mRNA levels were not significantly modified by LTC4, nor IL1 beta. Our findings suggest that LTC4 plays a role in the modulation of fibroblast collagenase, and it may participate in extracellular matrix remodeling during lung inflammation." @default.
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• W1998396597 date "1994-11-01" @default.
• W1998396597 modified "2023-09-27" @default.
• W1998396597 title "Leukotriene C4 upregulates collagenase expression and synthesis in human lung fibroblasts" @default.
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• W1998396597 doi "https://doi.org/10.1016/0167-4889(94)90187-2" @default.
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