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Melatonin in humans physiological and clinical studies.

L Wetterberg

    Journal of Neural Transmission. Supplementum
    |January 1, 1978
    PubMed
    Summary

    Melatonin levels in bodily fluids show diurnal variations influenced by light, sleep, and disease. Environmental factors and certain medical conditions can alter melatonin secretion patterns.

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    Area of Science:

    • Endocrinology
    • Neuroscience
    • Chronobiology

    Background:

    • Melatonin, a hormone primarily produced by the pineal gland, plays a crucial role in regulating circadian rhythms.
    • Understanding melatonin's secretion patterns is vital for diagnosing and managing various endocrine and neurological disorders.

    Purpose of the Study:

    • To investigate the diurnal variations of melatonin in serum, plasma, urine, and cerebrospinal fluid in healthy individuals and patients with diverse diseases.
    • To explore the impact of environmental factors like light exposure and sleep patterns on melatonin secretion.
    • To examine the relationship between melatonin levels and other hormones, as well as the effects of specific medical conditions and pharmacological agents on melatonin rhythms.

    Main Methods:

    • Measurement of melatonin concentrations in various biological samples (serum, plasma, urine, CSF) from normal subjects and patients.
    • Controlled experiments involving altered light-dark cycles, sleep deprivation, and simulated jet lag.
    • Administration of exogenous melatonin and assessment of its pharmacokinetic profile.
    • Analysis of melatonin levels in patients with conditions such as alcoholism, migraine, pituitary tumors, and schizophrenia, and in response to specific medical treatments.

    Main Results:

    • Diurnal variation of plasma and urine melatonin persisted even under constant light conditions.
    • Melatonin rhythm was affected by extended darkness and shifts in sleep-activity cycles.
    • The nocturnal rise in plasma melatonin preceded the increase in cortisol and prolactin.
    • Exogenous melatonin administration resulted in a rapid peak plasma concentration.
    • Patients with alcoholism, migraine, pituitary tumors, and schizophrenia exhibited reduced melatonin rhythm amplitude, while some pituitary tumor patients showed occasional high levels.
    • Plasma melatonin levels were unaffected by electroconvulsive therapy, TRH, L-Dopa, or bromoergocryptine.

    Conclusions:

    • Melatonin secretion in humans is influenced by environmental lighting, sleep-wake cycles, drugs, and various disease states.
    • Disruptions in melatonin rhythm are associated with specific medical conditions, suggesting its role as a potential biomarker.
    • Further research into melatonin's regulation and its alterations in disease can lead to improved diagnostic and therapeutic strategies.

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