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Circadian rhythms of pineal function in rats.

S A Binkley

    Endocrine Reviews
    |January 1, 1983
    PubMed
    Summary

    Daily melatonin synthesis in rats is a circadian rhythm, driven by N-acetyltransferase activity (NAT). Light-dark cycles precisely control this rhythm, revealing a pineal gland "life history."

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    Area of Science:

    • Chronobiology
    • Neuroendocrinology
    • Molecular Biology

    Background:

    • Melatonin synthesis in the pineal gland follows a daily rhythm, primarily occurring during the subjective night in rats.
    • This rhythm persists under constant darkness, indicating an endogenous circadian nature.
    • The circadian rhythm of melatonin is potentially linked to the rhythm of N-acetyltransferase activity (NAT) within the pineal gland.

    Purpose of the Study:

    • To investigate the circadian rhythm of N-acetyltransferase (NAT) activity in the rat pineal gland.
    • To understand the role of NAT rhythm as a component in the timing of circadian rhythms.
    • To elucidate the neural and environmental control mechanisms, particularly light, influencing the NAT rhythm.

    Main Methods:

    • Extensive study of N-acetyltransferase (NAT) activity rhythms in rat pineal glands.
    • Analysis of neural signals transmitted via the sympathetic nervous system to the pineal gland.
    • Investigation of environmental lighting conditions and their precise control over NAT rhythm timing.

    Main Results:

    • The circadian rhythm of N-acetyltransferase (NAT) activity is a key feature of the rat pineal gland.
    • Neural signals from the sympathetic nervous system drive the NAT rhythm.
    • Environmental light-dark cycles exert precise temporal control over the NAT rhythm, establishing a daily "life history" for the pineal gland.

    Conclusions:

    • The N-acetyltransferase (NAT) rhythm is a critical circadian rhythm in the rat pineal gland, influencing melatonin synthesis.
    • Sympathetic neural input and environmental lighting are key regulators of the NAT rhythm.
    • The study provides a framework for understanding the generation and light-mediated control of pineal circadian rhythms.

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