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Tks5-dependent, nox-mediated generation of reactive oxygen species is necessary for invadopodia formation

Begoña Diaz1, Gidon Shani, Ian Pass

  • 1Tumor Microenvironment Program, Burnham Institute for Medical Research, La Jolla, CA 92037, USA.

Science Signaling
|September 17, 2009
PubMed

Insights

Reactive oxygen species (ROS) generated by NADPH oxidase are crucial for cancer cell invadopodia formation and function. The Tks5 protein facilitates ROS production, creating a feedback loop that enhances invadopodia activity.

Area of Science:

  • Cell Biology
  • Cancer Research
  • Biochemistry

Background:

  • Invadopodia are critical actin-rich structures enabling cancer cell invasion and proteolysis.
  • The role of reactive oxygen species (ROS) in invadopodia formation remains incompletely understood.

Purpose of the Study:

  • To investigate the necessity of NADPH oxidase (Nox)-generated ROS for invadopodia formation and function.
  • To elucidate the relationship between the invadopodia protein Tks5 and the Nox system.

Main Methods:

  • Knockdown of Tks5 to assess its impact on ROS levels.
  • Co-immunoprecipitation to determine the association between Tks5 and Nox components (p22phox).
  • Inhibition of Nox to evaluate effects on Tks5 and Tks4 tyrosine phosphorylation.

Main Results:

  • Tks5 knockdown significantly reduced ROS abundance in cancer cells.
  • Tks5 was found to associate with p22phox, suggesting its role in the Nox complex.
  • Nox inhibition decreased tyrosine phosphorylation of Tks5 and Tks4.

Conclusions:

  • Tks5 is essential for ROS production, which is required for invadopodia formation.
  • ROS positively modulate Tks5 tyrosine phosphorylation, establishing a feedback loop that promotes invadopodia activity and cancer cell invasion.

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