Reciprocal down-regulation of p53 and SOD2 gene expression-implication in p53 mediated apoptosis

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Yeast As a Chassis for Developing Functional Assays to Study Human P53
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Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

P Drane1, A Bravard, V Bouvard

  • 1Commissariat à l'Energie Atomique (CEA), Laboratoire de Cancérogenèse Moléculaire, UMR217 CEA-CNRS, DRR, DSV, BP6 92265 Fontenay-aux-Roses Cedex, France.

Oncogene
|April 21, 2001
PubMed

Insights

The tumor suppressor p53 represses the expression of manganese superoxide dismutase (MnSOD), a key antioxidant enzyme. This mutual regulation between p53 and SOD2 influences apoptosis and cellular oxidative stress.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • The p53 tumor suppressor regulates genes involved in cellular responses to stress.
  • Redox-related genes are proposed to induce oxidative stress, leading to p53-dependent apoptosis.
  • Manganese superoxide dismutase (MnSOD) is a critical antioxidant enzyme and the product of the SOD2 gene.

Purpose of the Study:

  • To investigate the regulatory relationship between p53 and the SOD2 gene.
  • To determine if p53 influences MnSOD expression and its role in apoptosis.

Main Methods:

  • Reporter gene assays to assess promoter activity.
  • Analysis of gene expression levels.
  • Experimental manipulation of MnSOD and p53 levels.

Main Results:

  • p53 represses SOD2 gene expression at the promoter level.
  • Overexpression of MnSOD reduces p53-mediated apoptosis.
  • MnSOD overexpression also decreases p53 gene expression at the promoter level.

Conclusions:

  • p53 and SOD2 genes are mutually regulated.
  • This reciprocal regulation modulates cellular processes, including apoptosis and oxidative stress response.

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