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Reactive oxygen generated by NADPH oxidase 1 (Nox1) contributes to cell invasion by regulating matrix

Masahiro Shinohara1, Yoshifumi Adachi, Junji Mitsushita

  • 1Department of Molecular Biology and Biochemistry, Shinshu University Graduate School of Medicine, Matsumoto, Nagano 390-8621, Japan.

The Journal of Biological Chemistry
|December 19, 2009
PubMed

Insights

The enzyme Nox1 (NADPH oxidase 1) promotes cancer cell invasion by increasing reactive oxygen species. Inhibiting Nox1 reduces cell migration and matrix metalloproteinase-9 production, crucial for tumor spread.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Oncology

Background:

  • The enzyme NADPH oxidase 1 (Nox1) is implicated in Ras oncogene-driven cancer phenotypes.
  • Its role in regulating cancer cell invasiveness remains largely unexplored.

Purpose of the Study:

  • To investigate the role of Nox1 signaling in cancer cell invasion.
  • To elucidate the molecular mechanisms underlying Nox1-mediated cell invasion.

Main Methods:

  • Utilized K-Ras-transformed normal rat kidney cells and CaCO-2 cells.
  • Employed Nox1 small interference RNAs (siRNAs) and diphenyleneiodonium (DPI) to inhibit Nox1.
  • Assessed matrix metalloproteinase-9 (MMP-9) expression, NF-kappaB signaling, and Rho GTPase activity.

Main Results:

  • Nox1 inhibition attenuated K-Ras-transformed cell invasion and MMP-9 up-regulation.
  • Nox1 inhibition suppressed NF-kappaB signaling pathway activation.
  • Nox1 activity was essential for epidermal growth factor-stimulated cell migration, mediated by Rho GTPase down-regulation.

Conclusions:

  • Nox1-generated reactive oxygen species play a critical role in mediating cancer cell invasion.
  • Nox1 regulates key processes including metalloproteinase production and cell motility.

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