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Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

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

Published on: August 4, 2019

Sod1 loss induces intrinsic superoxide accumulation leading to p53-mediated growth arrest and apoptosis

Kenji Watanabe1, Shuichi Shibuya, Hirofumi Koyama

  • 1Department of Advanced Aging Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan. shimizut@chiba-u.jp.

International Journal of Molecular Sciences
|May 28, 2013
PubMed

Insights

Superoxide dismutase 1 (SOD1) deficiency causes aging-like symptoms by increasing oxidative stress and activating p53. Antioxidant treatments reversed these effects, highlighting SOD1

Area of Science:

  • Cellular Biology
  • Biochemistry
  • Aging Research

Background:

  • Oxidative stress from redox imbalance drives age-related cellular changes.
  • Superoxide dismutase (SOD) enzymes, particularly SOD1, are crucial for managing superoxide radicals (O2·-) and maintaining tissue homeostasis.
  • Previous studies indicated SOD1's essential role due to aging-like phenotypes in Sod1-deficient mice.

Purpose of the Study:

  • To investigate the specific cellular functions of SOD1.
  • To elucidate the cellular phenotypes associated with Sod1 deficiency in fibroblasts.
  • To understand the role of O2·- accumulation and p53 activation in Sod1-deficient cells.

Main Methods:

  • Cultured Sod1-deficient fibroblasts to analyze cellular phenotypes.
  • Assessed cell proliferation, apoptosis, O2·- levels (cytoplasmic and mitochondrial), mitochondrial membrane potential, and DNA damage.
  • Utilized antioxidant treatments and in vivo transdermal vitamin C derivative application.

Main Results:

  • Sod1 deficiency impaired fibroblast proliferation and induced apoptosis.
  • Observed increased O2·- accumulation in cytoplasm and mitochondria, decreased mitochondrial membrane potential, and p53 activation.
  • Antioxidant treatments ameliorated cellular phenotypes by reducing O2·- and p53 activation.
  • In vivo studies showed vitamin C derivative reversed skin thinning linked to p53.

Conclusions:

  • Intrinsic O2·- accumulation in Sod1-deficient fibroblasts drives mitochondrial dysfunction, p53-mediated growth arrest, and apoptosis.
  • SOD1 is critical for preventing oxidative damage and maintaining cellular homeostasis.
  • Targeting O2·- accumulation and p53 activation offers potential therapeutic strategies for age-related conditions.

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