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Caveolin-1 inhibits membrane-type 1 matrix metalloproteinase activity

Hye-Nan Kim1, Hye-Shin Chung

  • 1Department of Biotechnology, Hannam University, Daejeon 305-811, Korea.

BMB Reports
|January 7, 2009
PubMed

Insights

Caveolin-1 down-regulates membrane-type 1 matrix metalloproteinase (MT1-MMP) activity. This protein reduces extracellular matrix degradation and inhibits cancer cell migration by promoting MT1-MMP internalization.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Cancer Research

Background:

  • Membrane-type 1 matrix metalloproteinase (MT1-MMP) is a key enzyme in extracellular matrix remodeling, cancer cell migration, and metastasis.
  • MT1-MMP localizes to cholesterol-rich lipid rafts and activates pro-matrix metalloproteinase-2 (proMMP-2).
  • The role of caveolin-1, a caveolae protein, in regulating MT1-MMP activity is not well understood.

Purpose of the Study:

  • To investigate the role of caveolin-1 in the regulation of MT1-MMP activity.
  • To determine how caveolin-1 affects proMMP-2 activation, extracellular matrix degradation, and cell migration.

Main Methods:

  • Utilized wild-type, cytoplasmic tail deletion (DeltaCT), and catalytically inactive (E240A) mutants of MT1-MMP.
  • Co-expressed MT1-MMP variants with caveolin-1 in cells.
  • Assessed proMMP-2 activation, collagen degradation, and cell migration.

Main Results:

  • Caveolin-1 expression attenuated proMMP-2 activation by wild-type and DeltaCT MT1-MMP.
  • Co-expression of caveolin-1 reduced extracellular matrix (collagen) degradation and inhibited cell migration.
  • Caveolin-1 did not affect the activity of the catalytically inert E240A MT1-MMP mutant.

Conclusions:

  • Caveolin-1 plays a crucial role in down-regulating MT1-MMP activity.
  • Caveolin-1 likely functions by promoting the internalization of MT1-MMP from the cell surface, thereby reducing its enzymatic function.

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