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Related Experiment Videos

Pinealectomy abolishes plasma melatonin in the rat

A J Lewy, M Tetsuo, S P Markey

    The Journal of Clinical Endocrinology and Metabolism
    |January 1, 1980
    PubMed
    Summary

    Pinealectomized rats lacked plasma melatonin, indicating the pineal gland is the primary source of circulating melatonin. This confirms plasma melatonin as a marker for pineal gland circadian rhythm and beta-adrenergic control.

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    Area of Science:

    • Neuroendocrinology
    • Chronobiology
    • Biochemistry

    Background:

    • Melatonin, a hormone regulating circadian rhythms, is primarily synthesized in the pineal gland.
    • The exact contribution of the pineal gland to circulating melatonin levels requires precise quantification.

    Purpose of the Study:

    • To investigate the origin of plasma melatonin using pinealectomized rats.
    • To determine if plasma melatonin levels accurately reflect pineal gland activity and its regulation.

    Main Methods:

    • Gas chromatography-negative ionization mass spectrometry was employed to measure plasma melatonin.
    • Comparisons were made between pinealectomized rats and sham-operated controls.

    Main Results:

    • Pinealectomized rats exhibited undetectable plasma melatonin levels.

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  • Intact (sham-operated) rats consistently showed detectable plasma melatonin.

    • Conclusions:

    • The pineal gland is the principal source of melatonin found in circulation.
    • Plasma melatonin levels serve as a reliable indicator of pineal gland circadian secretion and beta-adrenergic regulation.