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The c-FOS Protein Immunohistological Detection: A Useful Tool As a Marker of Central Pathways Involved in Specific Physiological Responses In Vivo and Ex Vivo
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Nox1 expression determines cellular reactive oxygen and modulates c-fos-induced growth factor, interleukin-8, and

Rebecca S Arnold1, Ju He, Andrea Remo

  • 1Department of Urology, Winship Cancer Institute, Emory University School of Medicine, 1365 Clifton Rd., Building B, Atlanta, GA 30322, USA.

The American Journal of Pathology
|December 7, 2007
PubMed

Insights

Nox1 overexpression increases reactive oxygen species (ROS) and prostate cancer cell proliferation. Inhibiting Nox1 with RNAi reversed these effects, suggesting Nox1 is a reversible signal in cancer development.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • Increased reactive oxygen species (ROS) are linked to cancer development.
  • Nox1 (NADPH oxidase 1) role in cellular proliferation and ROS production needs further investigation.

Purpose of the Study:

  • To investigate the role of Nox1 in prostate cancer cell proliferation and ROS generation.
  • To analyze the relationship between Nox1 expression, ROS levels, and signal transduction pathways.
  • To determine if Nox1 overexpression is an early event in prostate cancer development.

Main Methods:

  • Transfection of Nox1 RNAi constructs into DU145 prostate cancer cells overexpressing Nox1.
  • Measurement of Nox1 message and protein levels.
  • Assessment of cellular ROS levels and tumor growth.
  • Analysis of message levels for specific proteins (c-fos-induced growth factor, interleukin-8, Cav-1).
  • Utilizing a National Cancer Institute prostate cancer tissue microarray (CPCTR) for clinical correlation.

Main Results:

  • Nox1 RNAi transfection decreased Nox1 message and protein levels.
  • Decreased Nox1 levels reversed increased ROS and tumor growth in Nox1-overexpressing cells.
  • Nox1 overexpression altered message levels of c-fos-induced growth factor, interleukin-8, and Cav-1.
  • Nox1 protein overexpression was significantly more prevalent in tumor tissue (86%) than benign prostate tissue (62%).

Conclusions:

  • Nox1 overexpression acts as a reversible signal for cellular proliferation.
  • Nox1 plays a significant role in regulating ROS production and tumor growth in prostate cancer.
  • Nox1 overexpression is an early event in prostate cancer development, indicating its clinical relevance.

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