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MMP Secretion Rate and Inter-invadopodia Spacing Collectively Govern Cancer Invasiveness

Sandeep Kumar1, Alakesh Das1, Amlan Barai1

  • 1Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Mumbai, India.

Biophysical Journal
|February 8, 2018
PubMed

Insights

Cancer cells invade by degrading the extracellular matrix (ECM) using invadopodia. This study reveals soluble matrix metalloproteinases (MMPs) are key, with their secretion rate and invadopodia spacing controlling invasion pore size.

Area of Science:

  • Cell Biology
  • Biophysics
  • Cancer Research

Background:

  • Invadopodia are crucial for cancer cell invasion, mediating extracellular matrix (ECM) degradation.
  • The precise mechanisms by which invadopodia create invasion pores and the roles of different matrix metalloproteinases (MMPs) remain incompletely understood.

Purpose of the Study:

  • To investigate how invadopodia-mediated ECM degradation leads to pore formation for cancer cell invasion.
  • To determine the relative contributions of membrane-bound and soluble MMPs in this process.
  • To model invadopodia dynamics and identify key regulatory factors.

Main Methods:

  • Combined experimental approaches with computational modeling.
  • Utilized MDA-MB-231 breast cancer cells.
  • Developed a computational model to simulate invadopodia-ECM interactions.

Main Results:

  • Increased ECM density enhances ECM degradation and reduces inter-invadopodia spacing.
  • Soluble MMPs, activated by membrane-bound MT1-MMP, are the primary mediators of ECM degradation.
  • MMP secretion rate is a critical regulator of invadopodia stability and degraded zone size.

Conclusions:

  • Cancer cells dynamically regulate inter-invadopodia spacing and MMP secretion based on ECM density.
  • These factors collectively control the formation of invasion-conducive pores.
  • A balance between invadopodia penetration and ECM degradation is essential for cancer cell invasion.

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