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Quantitative Measurement of Invadopodia-mediated Extracellular Matrix Proteolysis in Single and Multicellular Contexts
14:23

Quantitative Measurement of Invadopodia-mediated Extracellular Matrix Proteolysis in Single and Multicellular Contexts

Published on: August 27, 2012

Calpain 2 and PTP1B function in a novel pathway with Src to regulate invadopodia dynamics and breast cancer cell

Christa L Cortesio1, Keefe T Chan, Benjamin J Perrin

  • 1Department of Biomolecular Chemistry, University of Wisconsin, Madison, WI 53706, USA.

The Journal of Cell Biology
|March 12, 2008
PubMed

Insights

Calpain 2 and protein tyrosine phosphatase 1B (PTP1B) are crucial for invadopodia formation and breast cancer cell invasion. This study reveals a novel signaling pathway regulating these processes.

Area of Science:

  • Cell Biology
  • Cancer Research
  • Biochemistry

Background:

  • Invadopodia are critical structures for cancer cell invasion and matrix degradation.
  • Calpain 2, a calcium-dependent protease, regulates cell adhesion dynamics.
  • The role of calpain 2 in invadopodia formation and breast cancer invasion was previously unclear.

Purpose of the Study:

  • To investigate the novel function of calpain 2 in invadopodia formation and breast cancer cell invasion.
  • To elucidate the signaling pathway involving calpain 2, PTP1B, and c-Src in regulating these processes.

Main Methods:

  • Utilized calpain-deficient breast cancer cells.
  • Assessed invadopodia formation and invasive abilities.
  • Investigated the role of protein tyrosine phosphatase 1B (PTP1B) and c-Src activity.

Main Results:

  • Calpain-deficient cells exhibited impaired invadopodia formation.
  • Expression of a PTP1B fragment rescued invadopodia formation in calpain-deficient cells.
  • PTP1B activity was essential for efficient invadopodia formation and breast cancer invasion.

Conclusions:

  • Calpain 2 regulates invadopodia formation and breast cancer invasion through PTP1B and c-Src.
  • PTP1B plays a significant role in breast cancer progression via invadopodia modulation.
  • A novel signaling pathway involving calpain 2, PTP1B, and Src is implicated in breast cancer invasion.

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