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Involvement of PA/plasmin system in the processing of pro-MMP-9 and in the second step of pro-MMP-2 activation

E N Baramova1, K Bajou, A Remacle

  • 1Laboratory of Biology, University of Liege, Belgium.

FEBS Letters
|March 24, 1997
PubMed

Insights

The plasminogen/plasmin system activates matrix metalloproteinase-2 (MMP-2) in a two-step process. This system is crucial for converting the intermediate MMP-2 form into its mature, active state.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Enzymology

Background:

  • Matrix metalloproteinase-2 (MMP-2) activation is a critical process in extracellular matrix remodeling.
  • MMP-2 activation occurs in a stepwise manner, involving an intermediate 64 kDa form and a mature 62 kDa form.

Purpose of the Study:

  • To investigate the role of the plasminogen/plasmin system in the second step of pro-MMP-2 activation.
  • To elucidate the involvement of plasminogen and urokinase plasminogen activator (uPA) in MMP-2 maturation.

Main Methods:

  • Utilized HT1080 cells and their membrane preparations.
  • Applied plasminogen addition under various cell culture conditions.
  • Employed plasmin inhibitors and anti-urokinase plasminogen activator (uPA) antibody for mechanistic studies.

Main Results:

  • Plasminogen addition facilitated the complete conversion of the intermediate 64 kDa MMP-2 to the mature 62 kDa form.
  • Pro-MMP-9 processing was also observed upon plasminogen addition.
  • The activation process was significantly inhibited by plasmin inhibitors and an anti-uPA antibody.

Conclusions:

  • The plasminogen/plasmin system plays a key role in the second step of MMP-2 activation.
  • Evidence supports the involvement of the plasminogen activator (PA)/plasmin system in MMP-2 maturation.
  • This finding highlights a specific pathway for generating active MMP-2.

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