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. 1995 Mar;146(3):764–771.

Basic fibroblast growth factor regulates type I collagen and collagenase gene expression in human smooth muscle cells.

S H Kennedy 1, H Qin 1, L Lin 1, E M Tan 1
PMCID: PMC1869161  PMID: 7887456

Abstract

Basic fibroblast growth factor (bFGF) is a multifunctional peptide well known for angiogenic, neurotropic, and mesoderm-inducing effects. In the present study, we have investigated the effects of bFGF on collagen and collagenase gene expression in human iliac arterial smooth muscle cells. We report that bFGF inhibits type I collagen gene expression and collagen biosynthesis, with concomitant stimulation of collagenase gene expression. The smooth muscle cells incubated with human recombinant bFGF decreased the mRNA steady state levels of pro-alpha 1(I) type I collagen by as much as 72%. [3H]Hydroxyproline synthesis was also suppressed by 59% compared with untreated control cultures. Indirect immunofluorescence confirmed corresponding changes at the protein level. In contrast to the down-regulation of type I collagen gene expression, collagenase gene expression was found to be up-regulated severalfold by bFGF. The data suggest that bFGF is capable of regulating collagen and collagenase gene expression divergently in human smooth muscle cells and that the effects appear to be mediated at a pretranslational level.

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