Background and Aims: The coordinated expression of matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs) plays a crucial role in tissue remodeling. We investigated the effects of fibroblast growth factor (FGF)-2 on the secretion of MMPs and TIMPs in human intestinal subepithelial myofibroblasts (SEMFs). Methods: The secretion of MMP-s and TIMPs was determined by ELISA or Western blotting. The mRNA expression of MMPs and TIMPs was assessed by Northern blotting. The activating protein (AP)-1-DNA binding activity was evaluated by electrophoretic gel mobility shift assays (EMSA). Results: Unstimulated intestinal SEMFs constitutively secreted MMP-2 and TIMP-2. FGF-2 stimulated MMP-1, MMP-3 and TIMP-1 secretion, but did not affect MMP-2 or TIMP-2 secretion. FGF-2 induced AP-1-DNA binding activity, and the c-Jun/AP-1 inhibitor curcumin attenuated the FGF-2-induced MMP-1, -3 and TIMP-1 mRNA expression. Mitogen-activated protein (MAP) kinase inhibitors (U0126 and PD098059) also blocked the MMP-1, -3 and TIMP-1 secretion. Furthermore, FGF-2 dose-dependently induced FGF-2 mRNA expression in these cells. Conclusions: FGF-2 may be one of important regulatory factors for extracellular matrix turnover via a modulation of MMP and TIMP secretion from SEMFs.

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