Cited by 719Circadian rhythm and melatoninAntioxidant Activity and Oxidative Stressmelanin and skin pigmentation

Melatonin as a Potent and Inducible Endogenous Antioxidant: Synthesis and Metabolism

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Tan, Dun-Xian, Manchester, Lucien, Esteban-Zubero, Eduardo, Zhou, Zhou, Reiter, Russel·2015·Molecules

Abstract

Melatonin is a tryptophan-derived molecule with pleiotropic activities. It is present in almost all or all organisms. Its synthetic pathway depends on the species in which it is measured. For example, the tryptophan to melatonin pathway differs in plants and animals. It is speculated that the melatonin synthetic machinery in eukaryotes was inherited from bacteria as a result of endosymbiosis. However, melatonin’s synthetic mechanisms in microorganisms are currently unknown. Melatonin metabolism is highly complex with these enzymatic processes having evolved from cytochrome C. In addition to its enzymatic degradation, melatonin is metabolized via pseudoenzymatic and free radical interactive processes. The metabolic products of these processes overlap and it is often difficult to determine which process is dominant. However, under oxidative stress, the free radical interactive pathway may be featured over the others. Because of the complexity of the melatonin degradative processes, it is expected that additional novel melatonin metabolites will be identified in future investigations. The original and primary function of melatonin in early life forms such as in unicellular organisms was as a free radical scavenger and antioxidant. During evolution, melatonin was selected as a signaling molecule to transduce the environmental photoperiodic information into an endocrine message in multicellular organisms and for other purposes as well. As an antioxidant, melatonin exhibits several unique features which differ from the classic antioxidants. These include its cascade reaction with free radicals and its capacity to be induced under moderate oxidative stress. These features make melatonin a potent endogenously-occurring antioxidant that protects organisms from catastrophic oxidative stress.

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Authors
Tan, D.-X., Manchester, L., Esteban-Zubero, E., Zhou, Z., & Reiter, R.
Affiliations
  • The University of Texas at San Antonio Health Science Center (US)
  • Department of Cellular and Structural Biology, Health Science Center, University of Texas, San Antonio, TX 78229, USA
Corresponding author
  • Tan, Dun-Xian
  • Reiter, Russel
Venue
Molecules
Publisher
MDPI AG
Published
2015-10-16
Volume
20
Issue
10
Pages
18886-18906
ISSN
1420-3049 (ISSN-L)
OpenAlex
W1962181495
Cited by
719
References
138
Citations by year
2026: 53 · 2025: 84 · 2024: 82 · 2023: 90 · 2022: 111 · 2021: 75 · 2020: 64 · 2019: 50 · 2018: 33 · 2017: 43 · 2016: 32 · 2015: 2
FWCI
3.90
Type
journal article
Language
en
Open access
Locations
  • Molecules (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Health Sciences › Medicine › Biochemistry › Antioxidant Activity and Oxidative Stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › melanin and skin pigmentation
Keywords
melatonin, antioxidants, melatonin synthesis, melatonin metabolism, tryptophan metabolism, oxidative stress, free radical scavenging, cytochrome c, endosymbiosis, melatonin metabolites, endogenous antioxidants
MeSH terms
Animals, Antioxidants, Humans, Melatonin, Reactive Oxygen Species, Oxidative Stress, Reactive Nitrogen Species, Biosynthetic Pathways

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