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Activity of MMP-19 inhibits capillary-like formation due to processing of nidogen-1

B Titz1, S Dietrich, T Sadowski

  • 1Institute of Biochemistry, Christian-Albrechts-Universität zu Kiel, Olshausenstr. 40, 24098, Germany.

Cellular and Molecular Life Sciences : CMLS
|July 9, 2004
PubMed

Insights

Matrix metalloproteinase 19 (MMP-19) disrupts capillary-like structure formation by cleaving nidogen-1, a key basement membrane protein. This MMP-19 activity prevents endothelial cells from forming functional vasculature in tumor extracellular matrix.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Oncology

Background:

  • Matrix metalloproteinase 19 (MMP-19) processes basement membrane proteins.
  • Endothelial cell function is crucial for tumor angiogenesis and vascularization.

Purpose of the Study:

  • To investigate the impact of MMP-19 on endothelial cell capillary-like formation within tumor extracellular matrix (ECM).
  • To identify specific ECM components targeted by MMP-19 during this process.

Main Methods:

  • Treatment of Matrigel matrix with active recombinant MMP-19.
  • Analysis of human microvascular endothelial cell (HMEC-1) capillary-like formation.
  • Proteomic analysis of Matrigel proteins cleaved by MMP-19.
  • Mapping of MMP-19 cleavage sites on nidogen-1.
  • Inhibition studies using anti-nidogen antibodies.

Main Results:

  • MMP-19 treatment prevented HMEC-1 capillary-like structure formation on Matrigel.
  • MMP-19 preferentially cleaved nidogen-1 at the Thr867-Leu868 site.
  • Cleavage separated the nidogen-1 G3 domain, disrupting its cross-linking capacity for laminin-1 and collagen IV.
  • Anti-nidogen antibodies targeting the G3 domain mimicked MMP-19's inhibitory effect on vascularization.

Conclusions:

  • MMP-19 interferes with endothelial cell vascularization by degrading nidogen-1.
  • MMP-19's cleavage of nidogen-1 impairs its function in stabilizing microvessels.
  • MMP-19 may play a role in hindering the maturation of nascent tumor vasculature.

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