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Identification of NCF2/p67phox as a novel p53 target gene

Dafne Italiano1, Anna Maria Lena, Gerry Melino

  • 1Department of Experimental Medicine and Surgery, University of Tor Vergata, Rome, Italy.

Cell Cycle (Georgetown, Tex.)
|November 29, 2012
PubMed

Insights

The tumor suppressor p53 directly activates the NCF2 gene, encoding p67phox, a key component of NADPH oxidase. This pathway generates reactive oxygen species (ROS) that protect cells from apoptosis, revealing a novel survival mechanism.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • The p53 protein is a critical tumor suppressor involved in cellular responses to stress.
  • NADPH oxidase (Nox) enzymes generate reactive oxygen species (ROS), which play diverse roles in cell signaling.
  • The specific role of p53 in regulating NADPH oxidase components and ROS production in cell survival remains incompletely understood.

Purpose of the Study:

  • To investigate the regulatory relationship between p53 and the NCF2 gene, which encodes the p67phox subunit of NADPH oxidase.
  • To elucidate the functional consequences of p53-mediated NCF2 regulation on ROS production and cell survival.

Main Methods:

  • Microarray analysis to identify p53-regulated genes.
  • Luciferase reporter assays and chromatin immunoprecipitation (ChIP) to confirm p53 binding and transcriptional activation of the NCF2 promoter.
  • Real-time PCR to validate NCF2 mRNA upregulation.
  • siRNA-mediated knockdown of NCF2 to assess its role in ROS production and cell death.

Main Results:

  • p53 induction led to significant upregulation of NCF2 mRNA in SaOs-2 cell lines.
  • p53 was demonstrated to directly bind to the NCF2 promoter, activating its transcription.
  • NCF2 knockdown resulted in reduced ROS production and increased cell death, indicating a pro-survival role for Nox2-generated ROS.
  • p53-mediated NCF2 upregulation contributes to ROS generation, promoting cell survival against apoptosis.

Conclusions:

  • The study identifies NCF2 as a novel direct transcriptional target of p53.
  • p53-induced NCF2/p67phox expression generates ROS that confer a survival advantage to cells.
  • This work uncovers a new redox-sensitive signaling pathway involving p53 and NCF2 in cell survival and apoptosis regulation.

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