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[Melatonin: hormone and medication]

Y Touitou1

  • 1Service de Biochimie Médicale, Faculté de Médecine Pitié-Salpêtrière, Paris.

Comptes Rendus Des Seances De La Societe De Biologie Et De Ses Filiales
|December 8, 1998
PubMed
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Melatonin, a hormone produced by the pineal gland, regulates circadian rhythms and adapts organisms to their environment. Its secretion is influenced by various factors, with light being the primary regulator.

Area of Science:

  • Endocrinology
  • Chronobiology
  • Neuroscience

Context:

  • Melatonin (N-Acetyl-5-methoxytryptamine) is a crucial hormone primarily synthesized by the pineal gland.
  • Its biosynthesis involves tryptophan and the key enzyme N-Acetyl-transferase (NAT).
  • Melatonin secretion exhibits a conserved nocturnal pattern across species, with concentrations significantly higher at night than during the day.

Purpose:

  • To elucidate the regulatory mechanisms and physiological significance of melatonin.
  • To highlight melatonin's role as a transducer of photic information.
  • To explain melatonin's function as a time-cue provider for environmental adaptation.

Summary:

  • Melatonin production is regulated by circadian rhythms and influenced by numerous endogenous and exogenous factors including age, sex, and season.

Related Experiment Videos

  • Light serves as the principal environmental cue, modulating melatonin release via the retino-hypothalamic tract.
  • Melatonin effectively communicates day length information to the organism, facilitating adaptation.

    • Impact:

    • Understanding melatonin's regulation provides insights into circadian rhythm disorders.
    • Melatonin's role in photic signal transduction is critical for biological timekeeping.
    • This hormone is essential for organisms to synchronize their internal physiology with external environmental cycles.