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HBP1 repression of the p47phox gene: cell cycle regulation via the NADPH oxidase

Stephen P Berasi1, Mei Xiu, Amy S Yee

  • 1Department of Biochemistry, Tufts University School of Medicine, School of Nutrition, Boston, Massachusetts 02111, USA.

Molecular and Cellular Biology
|March 17, 2004
PubMed

Insights

The transcriptional repressor HMG box-containing protein 1 (HBP1) controls cell growth by regulating NADPH oxidase. HBP1 represses p47phox gene expression, reducing reactive oxygen species (ROS) and inhibiting cell cycle progression.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Reactive oxygen species (ROS) produced by NADPH oxidase are implicated in cellular growth control.
  • ROS generation is often essential for growth factor signaling and mitogenesis in non-immune cells.

Purpose of the Study:

  • To investigate the role of the transcriptional repressor HMG box-containing protein 1 (HBP1) in regulating NADPH oxidase and cellular growth.
  • To elucidate the mechanism by which HBP1 influences reactive oxygen species (ROS) production and cell cycle progression.

Main Methods:

  • Analysis of HBP1 binding sites on the p47phox gene promoter.
  • Repression assays to determine HBP1's effect on p47phox gene expression.
  • Measurement of intracellular superoxide production.
  • Cell cycle analysis using wild-type and dominant-negative HBP1 mutants.

Main Results:

  • HBP1 directly represses the p47phox gene through specific DNA-binding elements in its promoter.
  • HBP1 expression leads to reduced p47phox gene expression and consequently decreased intracellular superoxide production.
  • The inhibition of NADPH oxidase-dependent superoxide production by HBP1 contributes to cell cycle arrest.

Conclusions:

  • HBP1 regulates NADPH oxidase-dependent superoxide production via transcriptional repression of the p47phox gene.
  • This study identifies a novel transcriptional mechanism for controlling intracellular ROS levels.
  • The findings have significant implications for understanding cell cycle regulation and ROS homeostasis.

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