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Reactive oxygen intermediates, molecular damage, and aging. Relation to melatonin

R J Reiter1, J M Guerrero, J J Garcia

  • 1Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio 78284-7762, USA. reiter@uthscsa.edu

Annals of the New York Academy of Sciences
|February 3, 1999
PubMed
Summary

Melatonin is a potent antioxidant that protects cells from oxidative damage by scavenging free radicals and enhancing antioxidant enzymes. Its protective effects extend to DNA and mitochondria, with reduced levels linked to aging-related oxidative stress.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Gerontology

Background:

  • Melatonin is the primary hormone secreted by the pineal gland.
  • Oxidative stress is implicated in aging and various diseases.
  • Understanding melatonin's antioxidant mechanisms is crucial for therapeutic applications.

Purpose of the Study:

  • To elucidate the multifaceted antioxidant properties of melatonin.
  • To investigate melatonin's protective effects against various oxidative stressors.
  • To explore the relationship between melatonin, aging, and oxidative damage.

Main Methods:

  • Review of existing literature on melatonin's chemical and biological properties.
  • Analysis of studies demonstrating melatonin's free radical scavenging activity.

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  • Examination of experimental models of oxidative stress and melatonin's efficacy.

    • Main Results:

    • Melatonin directly scavenges multiple reactive oxygen and nitrogen species.
    • It enhances the activity of key antioxidant enzymes (e.g., superoxide dismutase, glutathione peroxidase).
    • Melatonin protects lipids, DNA, and mitochondria from oxidative damage, preserving ATP production.

    Conclusions:

    • Melatonin exhibits potent, direct, and indirect antioxidant capabilities.
    • Its ability to protect cellular macromolecules and mitochondria underscores its significance.
    • Age-related decline in melatonin may contribute to increased oxidative damage in the elderly.