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Suppression of oxygen toxicity by melatonin
1Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio 78284-7762, USA. Reiter@uthscsa.edu
Zhongguo Yao Li Xue Bao = Acta Pharmacologica Sinica
|August 7, 1999
Summary
Melatonin, a pineal gland hormone, acts as a potent antioxidant. It effectively scavenges harmful free radicals and protects against oxidative damage, with implications for aging and diseases.
Area of Science:
- Biochemistry
- Molecular Biology
- Physiology
Background:
- Melatonin is the primary secretion of the pineal gland.
- Oxidative damage from free radicals is implicated in aging and disease.
- Previous studies often used high melatonin doses, but physiological concentrations also show protective effects.
Purpose of the Study:
- To investigate the antioxidant and free radical scavenging capabilities of melatonin at physiological concentrations.
- To elucidate the mechanisms by which melatonin protects against molecular damage.
Main Methods:
- Review of existing literature on melatonin's antioxidant properties.
- Analysis of melatonin's interactions with various reactive oxygen and nitrogen species.
- Examination of melatonin's effects on antioxidant enzymes and cellular components.
Main Results:
- Melatonin scavenges hydroxyl radicals and detoxifies peroxynitrite, nitric oxide, singlet oxygen, and peroxyl radicals.
- Melatonin may stimulate antioxidant enzymes like superoxide dismutase and glutathione peroxidase.
- Melatonin chelates metal ions, preventing lipid peroxidation and DNA damage in vivo.
Conclusions:
- Melatonin possesses significant antioxidant and free radical scavenging properties at physiological levels.
- Its multifaceted actions protect cellular structures from oxidative stress.
- These findings suggest a role for melatonin in mitigating age-related diseases and the aging process.