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Rat Mesentery Exteriorization: A Model for Investigating the Cellular Dynamics Involved in Angiogenesis
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Disruption of angiogenesis by PEX, a noncatalytic metalloproteinase fragment with integrin binding activity

P C Brooks1, S Silletti, T L von Schalscha

  • 1Department of Immunology, The Scripps Research Institute, La Jolla, California 92037, USA.

Cell
|February 26, 1998
PubMed

Insights

A protein fragment called PEX inhibits matrix metalloproteinase 2 (MMP-2) activity. This natural inhibitor blocks angiogenesis and tumor growth by preventing MMP-2 from binding to integrin alphavbeta3 on blood vessels.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Oncology

Background:

  • Angiogenesis involves cell adhesion and proteolysis.
  • Matrix metalloproteinase 2 (MMP-2) and integrin alphavbeta3 are key players in blood vessel formation.

Purpose of the Study:

  • To investigate the role of an MMP-2 fragment (PEX) in regulating angiogenesis.
  • To determine if PEX acts as a natural inhibitor of MMP-2 activity in vivo.

Main Methods:

  • Studied the interaction between PEX, MMP-2, and integrin alphavbeta3.
  • Assessed the effect of PEX on angiogenesis using the chick chorioallantoic membrane model.
  • Detected PEX and alphavbeta3 expression in tumor tissues and during retinal neovascularization.

Main Results:

  • PEX, a fragment of MMP-2, inhibits MMP-2 binding to integrin alphavbeta3.
  • PEX blocks cell surface collagenolytic activity and disrupts angiogenesis and tumor growth.
  • Naturally occurring PEX is found in vivo with alphavbeta3 in vascularized tissues.

Conclusions:

  • PEX functions as a natural inhibitor of MMP-2 activity.
  • PEX regulates endothelial cell invasion by modulating MMP-2 activity via alphavbeta3 interaction.
  • PEX holds potential for therapeutic strategies targeting angiogenesis and tumor growth.

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