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Peroxisomes and oxidative stress.

Michael Schrader1, H Dariush Fahimi

  • 1Department of Cell Biology and Cell Pathology, University of Marburg, Robert Koch Str. 6, 35037 Marburg, Germany. schrader@mailer.uni-marburg.de

Biochimica Et Biophysica Acta
|October 13, 2006
PubMed
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Peroxisomes play a dual role in managing reactive oxygen species (ROS), contributing to both cell damage and protection. This review explores their involvement in various physiological and pathological processes in animal cells.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Pathology

Background:

  • Peroxisomes were initially recognized for their role in oxygen metabolite metabolism through catalase colocalization.
  • These organelles are now understood to be involved in both generating reactive oxygen species (ROS) and protecting cells from their damaging effects.

Purpose of the Study:

  • To review the multifaceted role of peroxisomes in physiological and pathological processes involving ROS, primarily in animal cells.
  • To examine the enzymes responsible for generating and scavenging hydrogen peroxide (H2O2) and other oxygen metabolites.

Main Methods:

  • Review of existing literature on peroxisome function in relation to ROS.
  • Analysis of cellular responses to stimuli like UV light, oxidizing agents, and inflammatory conditions.

Related Experiment Videos

  • Examination of peroxisome-related gene (PEX) expression and peroxisome proliferator-activated receptor alpha (PPARα) activity.

    • Main Results:

    • Peroxisome proliferation, including tubular forms and PEX gene upregulation, occurs upon exposure to UV light and oxidizing agents.
    • Inflammatory conditions like infections and ischemia-reperfusion injury lead to reduced peroxisomal volume and enzyme activity, influenced by TNFα and PPARα.
    • Xenobiotic-induced peroxisome proliferation in rodents, linked to PPARα, can result in tumor formation due to ROS imbalance.
    • PEX5-/- mice lacking functional peroxisomes exhibit mitochondrial abnormalities resembling oxidative stress disorders, yet without direct evidence of oxidative damage or increased peroxide production, suggesting a protective role for PPARα.

    Conclusions:

    • Peroxisomes are critical regulators of cellular redox homeostasis, impacting cell fate in both health and disease.
    • Dysregulation of peroxisomal ROS metabolism, particularly mediated by PPARα, is implicated in inflammation, tumorigenesis, and mitochondrial dysfunction.
    • Further investigation into PPARα's role in preventing oxidative stress in the absence of functional peroxisomes is warranted.