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The basic physiology and pathophysiology of melatonin.

Bruno Claustrat1, Jocelyne Brun, Guy Chazot

  • 1Centre de Médecine Nucléaire, Service de Radioanalyse, Hôpital Neuro-Cardiologique, 59 Boulevard Pinel, 69394 Lyon Cedex 03, France. bruno.claustrat@chu-lyon.fr

Sleep Medicine Reviews
|January 15, 2005
PubMed
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Melatonin, a hormone produced by the pineal gland, signals night length and organizes circadian rhythms. Its disruption can impact immune, antioxidative, and metabolic functions, potentially increasing disease risk.

Area of Science:

  • Chronobiology
  • Endocrinology
  • Neuroscience

Background:

  • Melatonin is a pineal gland hormone synthesized at night, regulated by the suprachiasmatic nuclei and light-dark cycles.
  • Its secretion rhythm conveys photoperiod information, influencing seasonal and circadian functions.
  • Melatonin's role in organizing human physiological rhythms, including temperature and sleep-wake cycles, is supported by evidence.

Purpose of the Study:

  • To explore the physiological functions of melatonin, particularly its role in circadian rhythm organization.
  • To investigate the impact of melatonin secretion alterations on various bodily functions and disease predisposition.

Main Methods:

  • Measurement of plasma/saliva melatonin or urinary sulfatoxymelatonin to determine nycthemeral rhythm.

Related Experiment Videos

  • Analysis of correlative observations and evidence regarding melatonin's effects on circadian rhythms.
  • Examination of complex regulatory pathways of melatonin secretion and associated pathophysiological conditions.

    • Main Results:

    • Melatonin secretion adjusts to night length, signaling daily and seasonal cycles.
    • Melatonin stabilizes and strengthens the coupling of circadian rhythms, notably core body temperature and sleep-wake cycles.
    • Disturbed melatonin secretion is linked to increased disease predisposition and altered disorder outcomes.

    Conclusions:

    • Melatonin is a crucial signal for circadian and seasonal organization.
    • Alterations in melatonin secretion can disrupt physiological functions, including immune, antioxidative, hemostasis, and glucose regulation.
    • Pathophysiological conditions affecting melatonin secretion can have significant health consequences.