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Related Experiment Videos

Redefining oxidative stress.

Dean P Jones1

  • 1Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, Whitehead Biomedical Research Center, Emory University, Atlanta, Georgia 30322, USA. dpjones@emory.edu

Antioxidants & Redox Signaling
|September 22, 2006
PubMed
Summary
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Oxidative stress is not just an antioxidant imbalance. Redox signaling disruptions, not a single balance, better define this condition, paving the way for new disease treatments.

Area of Science:

  • Biochemistry
  • Cellular Biology
  • Physiology

Background:

  • Oxidative stress is commonly defined as an imbalance between pro-oxidants and antioxidants.
  • Plasma glutathione (GSH/GSSG) redox state reflects this balance but is influenced by age, smoking, and diseases like diabetes and cardiovascular disease.
  • However, plasma GSH/GSSG is not in equilibrium with the cysteine/cystine (Cys/CySS) pool.

Purpose of the Study:

  • To challenge the conventional definition of oxidative stress.
  • To propose a revised mechanistic definition based on redox signaling and control disruptions.
  • To highlight the implications for disease research and treatment development.

Main Methods:

  • Analysis of existing data on plasma redox states (GSH/GSSG and Cys/CySS).

Related Experiment Videos

  • Comparison of redox equilibrium across major thiol/disulfide systems (GSH/GSSG, thioredoxin, Cys/CySS).
  • Mechanistic interpretation of how these systems respond to stimuli.

    • Main Results:

    • Major thiol/disulfide systems are not in redox equilibrium.
    • These systems respond distinctly to toxicants and physiological stimuli.
    • Plasma GSH/GSSG redox is not solely indicative of overall antioxidant balance.

    Conclusions:

    • Oxidative stress is better defined mechanistically as a disruption of redox signaling and control.
    • This revised definition emphasizes discrete pathway perturbations over a global balance.
    • Adopting this definition can guide research toward identifying key redox signaling disruptions and developing novel therapies for oxidative stress-related diseases.