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TIMP-1 inhibits microvascular endothelial cell migration by MMP-dependent and MMP-independent mechanisms

Takemi Akahane1, Manabu Akahane, Amy Shah

  • 1Laboratory of Cellular Carcinogenesis and Tumor Promotion, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892-4255, USA.

Experimental Cell Research
|November 9, 2004
PubMed

Insights

Tissue inhibitor of metalloproteinases-1 (TIMP-1) inhibits endothelial cell migration by increasing cell-cell adhesion proteins and decreasing focal adhesion kinase signaling. This clarifies TIMP-1

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Angiogenesis Research

Background:

  • Tissue inhibitor of metalloproteinases-1 (TIMP-1) is known to suppress angiogenesis.
  • The precise molecular mechanisms underlying TIMP-1's anti-angiogenic effects remain incompletely understood.
  • Endothelial cell (EC) migration is a critical process in angiogenesis.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which TIMP-1 inhibits endothelial cell migration.
  • To investigate the roles of matrix metalloproteinases (MMPs) and focal adhesion kinase (FAK) signaling in TIMP-1's effects.

Main Methods:

  • In vitro study using human dermal microvascular endothelial cells (HDMVEC).
  • Treatment with recombinant human TIMP-1 and synthetic MMP inhibitors (GM6001, MMP-2-MMP-9 Inhibitor III).
  • Analysis of endothelial cell migration, expression of junctional adhesion proteins (VE-cadherin, PECAM-1), FAK phosphorylation, PTEN expression, and cytoskeletal organization.

Main Results:

  • TIMP-1 and MMP inhibitors dose-dependently suppressed HDMVEC migration.
  • MMP-dependent inhibition involved increased VE-cadherin and PECAM-1 expression and VE-cadherin accumulation at cell junctions.
  • MMP-independent inhibition involved FAK and paxillin dephosphorylation, reduced F-actin stress fibers, and stimulated PTEN expression.

Conclusions:

  • TIMP-1 inhibits endothelial cell migration via a dual mechanism.
  • MMP-dependent pathway: enhanced VE-cadherin expression and cell-cell adhesion.
  • MMP-independent pathway: PTEN stimulation, FAK dephosphorylation, and cytoskeletal remodeling.

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