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Updated: Aug 19, 2026

Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
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Published on: June 7, 2019

Cell membrane-associated MT1-MMP-dependent activation of pro-MMP-2 in A375 melanoma cells

Aniruddha Banerji1, Jayati Chakraborti, Aparna Mitra

  • 1Department of Receptor Biology & Tumor Metastasis, Chittaranjan National Cancer Institute, Kolkata, India.

Journal of Environmental Pathology, Toxicology and Oncology : Official Organ of the International Society for Environmental Toxicology and Cancer
|February 18, 2005
PubMed
Abstract

Insights

Matrix metalloproteinases (MMPs) are key in cancer spread. This study shows membrane type 1 matrix metalloproteinase (MT1-MMP) mediates MMP-2 activation in melanoma cells, crucial for metastasis.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Oncology

Background:

  • Matrix metalloproteinases (MMPs) degrade extracellular matrix, aiding cancer invasion.
  • MMP-2 (72 kDa type IV collagenase) activation is linked to metastasis and elevated in many human tumors.
  • MMP-2 activation occurs via a membrane-associated complex involving MT1-MMP, TIMP-2, and integrin αvβ3.

Purpose of the Study:

  • To investigate the cell surface-associated activation of MMP-2 in the A375 human melanoma cell line.
  • To elucidate the specific role of MT1-MMP in MMP-2 activation within this melanoma model.

Main Methods:

  • Gelatin zymography was used to assess MMP-2 activation by A375 cells.
  • A375 cell membrane fractions and extracts were analyzed for MMP-2 activation.
  • Immunocytochemistry and Western blotting confirmed the presence and localization of MT1-MMP and integrin αvβ3.

Main Results:

  • A375 cells specifically activated pro-MMP-2, not pro-MMP-9.
  • MT1-MMP-mediated activation of MMP-2 was demonstrated, with activation significantly reduced upon incubation with anti-MT1-MMP antibody.
  • MT1-MMP was localized at focal adhesion sites, and key components of the activation complex were confirmed.

Conclusions:

  • The findings confirm a unique membrane-associated MMP-2 activation mechanism in A375 melanoma cells.
  • MT1-MMP plays a critical role in mediating MMP-2 activation on the cell surface.
  • Understanding this mechanism could inform the development of novel anti-cancer therapies targeting MMP activation.

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