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Melatonin: Nature's most versatile biological signal?
S R Pandi-Perumal1, V Srinivasan, G J M Maestroni
1Comprehensive Center for Sleep Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, Mount Sinai School of Medicine, New York, NY 10029, USA. pandiperumal@gmail.com
The FEBS Journal
|July 5, 2006
Summary
Melatonin, the hormone of darkness, regulates sleep-wake cycles and acts as a chronological pacemaker. It also offers antioxidant, anti-apoptotic, and immune-enhancing benefits, impacting various physiological functions.
Area of Science:
- Chronobiology
- Neuroendocrinology
- Molecular Biology
Background:
- Melatonin is a ubiquitous molecule found in nature, synthesized primarily in the pineal gland in vertebrates.
- Its secretion is regulated by the light/dark cycle, earning it the name 'hormone of darkness'.
- Melatonin plays a crucial role in regulating circadian rhythms, acting as the body's 'Zeitgeber' or chronological pacemaker.
Purpose of the Study:
- To explore the diverse physiological functions of melatonin beyond its role in sleep regulation.
- To highlight melatonin's antioxidant, anti-apoptotic, and immune-modulating properties.
- To discuss the therapeutic potential of melatonin and its analogs in various health conditions.
Main Methods:
- Review of existing scientific literature on melatonin's synthesis, regulation, and functions.
- Analysis of studies investigating melatonin's effects on cellular processes and physiological systems.
- Examination of clinical data on melatonin's efficacy in treating sleep disorders and other conditions.
Main Results:
- Melatonin is synthesized in multiple tissues, not just the pineal gland, influencing physiological functions via paracrine signaling.
- Melatonin exhibits potent antioxidant and anti-apoptotic properties, offering cytoprotection, particularly during ischemia.
- Its chronobiotic effects are valuable for treating circadian rhythm sleep disorders, and it shows promise in managing insomnia and mood disorders.
Conclusions:
- Melatonin is a pleiotropic molecule with significant regulatory influence over numerous bodily functions.
- Its roles extend from timekeeping and sleep regulation to cytoprotection and immune modulation.
- Melatonin and its analogs represent promising therapeutic agents for a range of conditions, including sleep disorders, neurodegenerative diseases, and mood disorders.