Regulation of matrilysin expression in endothelium by fibroblast growth factor-2

W Holnthoner, M Kerenyi, M Gröger… - Biochemical and …, 2006 - Elsevier
W Holnthoner, M Kerenyi, M Gröger, F Kratochvill, P Petzelbauer
Biochemical and biophysical research communications, 2006Elsevier
Matrilysin (MMP7) is a secreted matrix metalloproteinase, which contributes to angiogenesis
by breaking down basement membranes. We show that the angiogenic factor FGF-2
induces MMP7 expression in human endothelial cells. The promoter contains a Lef/Tcf
consensus sequence, but using wildtype or Lef/Tcf-mutated promoter constructs, FGF-2-
induced MMP7 reporter activity is independent from Lef/Tcf sites. Instead, we show that
overexpression of a dominant negative Stat3 mutant reduces FGF-2-mediated MMP7 …
Matrilysin (MMP7) is a secreted matrix metalloproteinase, which contributes to angiogenesis by breaking down basement membranes. We show that the angiogenic factor FGF-2 induces MMP7 expression in human endothelial cells. The promoter contains a Lef/Tcf consensus sequence, but using wildtype or Lef/Tcf-mutated promoter constructs, FGF-2-induced MMP7 reporter activity is independent from Lef/Tcf sites. Instead, we show that overexpression of a dominant negative Stat3 mutant reduces FGF-2-mediated MMP7 promoter activity. However, Stat3 does not bind to the MMP7 promoter, but activates MMP7 gene expression indirectly via AP-1. This is confirmed by MMP7 promoter constructs with mutated AP-1 sites which did not respond to FGF-2 and by siRNAs against Stat1 and Stat3, which repressed FGF-2-induced MMP7 protein expression. In conclusion, we show that FGF-2-induced MMP7 expression in endothelium depends on AP-1 and FGF-2 signaling to AP-1 involves a Stat1/3-dependent pathway.
Elsevier