Cross-talk between vascular endothelial growth factor and matrix metalloproteinases in the induction of neovascularization in vivo.

The American Journal of Pathology
Quteba EbrahemBela Anand-Apte

Abstract

Matrix metalloproteinases (MMPs), a specialized group of enzymes capable of proteolytically degrading extracellular matrix proteins, have been postulated to play an important role in angiogenesis. It has been suggested that MMPs can regulate neovascularization using mechanisms other than simple remodeling of the capillary basement membrane. To determine the interplay between vascular endothelial growth factor (VEGF) and MMPs, we investigated the induction of angiogenesis by recombinant active MMPs and VEGF in vivo. Using a rat corneal micropocket in vivo angiogenesis assay, we observed that the active form of MMP-9 could induce neovascularization in vivo when compared with the pro- form of the enzyme as a control. This angiogenic response could be inhibited by neutralizing VEGF antibody, which suggests that MMPs acts upstream of VEGF. Additional in vitro studies using extracellular matrix loaded with radiolabeled VEGF determined that active MMPs can enzymatically release sequestered VEGF. Interestingly, in vivo angiogenesis induced by VEGF could be inhibited by MMP inhibitors, indicating that MMPs also act downstream of VEGF. In addition, inflammation plays an important role in the induction of angiogenesis mediated by both VEG...Continue Reading

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