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Aberrant, persistent inclusion into lipid rafts limits the tumorigenic function of membrane type-1 matrix

Dmitri V Rozanov1, Elena I Deryugina, Edward Z Monosov

  • 1Cancer Research Center, The Burnham Institute, La Jolla, CA 92037, USA.

Experimental Cell Research
|January 20, 2004
PubMed

Insights

The cytoplasmic tail of membrane type-1 matrix metalloproteinase (MT1-MMP) influences its cell surface presentation and function. Targeting MT1-MMP trafficking to lipid rafts may offer clinical benefits.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Oncology

Background:

  • Membrane type-1 matrix metalloproteinase (MT1-MMP) is crucial for cell migration and tissue remodeling.
  • Regulation of MT1-MMP cell surface levels occurs through membrane trafficking and internalization.
  • Lipid rafts and caveolae are specialized membrane microdomains involved in protein sorting and signaling.

Purpose of the Study:

  • To investigate the role of the cytoplasmic tail of MT1-MMP in its localization to lipid rafts.
  • To determine how MT1-MMP association with lipid rafts affects its function and cell surface presentation.
  • To explore the potential clinical implications of MT1-MMP trafficking mechanisms.

Main Methods:

  • Utilized breast carcinoma MCF7 cells.
  • Investigated MT1-MMP localization using lipid raft-enriched fractions.
  • Assessed MT1-MMP internalization and cell surface presentation.
  • Analyzed MT1-MMP enzymatic activity (proMMP-2 activation, collagen remodeling).
  • Examined effects on E-cadherin cleavage and cell contraction.

Main Results:

  • A mutant MT1-MMP lacking the cytoplasmic tail was recruited to lipid rafts.
  • Wild-type MT1-MMP showed transient association with lipid rafts.
  • Lipid raft localization correlated with reduced MT1-MMP internalization and persistent cell surface presence.
  • The tail mutant efficiently activated proMMP-2 and remodeled collagen matrices.
  • Recruitment to lipid rafts antagonized E-cadherin cleavage by the tail mutant, limiting cell migration and growth.

Conclusions:

  • The cytoplasmic tail of MT1-MMP is critical for its proper trafficking and regulated cell surface presentation.
  • MT1-MMP association with lipid rafts impairs E-cadherin cleavage, impacting cell locomotion and malignant potential.
  • Targeting MT1-MMP trafficking to caveolin-enriched lipid rafts presents a potential therapeutic strategy.

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