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Related Experiment Videos

Physiological mechanisms for metalloproteinase activation.

G Murphy1, R Ward, J Gavrilovic

  • 1Strangeways Research Laboratory, Cambridge, U.K.

Matrix (Stuttgart, Germany). Supplement
|January 1, 1992
PubMed
Summary

Plasmin is the primary activator of matrix metalloproteinases, including procollagenase and prostromelysin, in connective tissues. Stromelysin significantly enhances procollagenase activation by plasmin.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Connective Tissue Research

Background:

  • Matrix metalloproteinases (MMPs) are crucial for tissue remodeling.
  • Understanding MMP activation mechanisms is vital for studying diseases like cancer and arthritis.
  • Plasmin and TIMP (Tissue Inhibitor of Metalloproteinases) are implicated in MMP regulation.

Purpose of the Study:

  • To investigate in vivo-like mechanisms for activating procollagenase and prostromelysin.
  • To elucidate the roles of plasmin and stromelysin in MMP activation.
  • To compare the activation potential of various proteinases on MMPs.

Main Methods:

  • Utilized cell monolayers cultured on collagen films.
  • Employed purified proteinases for biochemical activation studies.
  • Assessed activation kinetics and efficiency using biochemical assays.

Main Results:

  • Fibroblast monolayers efficiently activated prostromelysin via plasminogen.
  • Plasmin alone poorly activated procollagenase, but stromelysin significantly enhanced this activation.
  • Tumor cells required exogenous stromelysin and plasminogen for collagen degradation.
  • Cathepsin B activated prostromelysin, but plasmin remained the most effective activator for MMPs.

Conclusions:

  • Plasmin's role as the principal activator of metalloproteinases in connective tissue cells is confirmed.
  • Stromelysin acts synergistically with plasmin to activate procollagenase.
  • These findings provide insights into MMP regulation in physiological and pathological contexts.

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