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Related Experiment Videos

Timekeeping by the pineal gland

S Binkley, J B Riebman, K B Reilly

    Science (New York, N.Y.)
    |September 16, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Chicken pineal gland N-acetyltransferase (NAT) activity follows a circadian rhythm, peaking in darkness. Organ culture of dark-time glands showed NAT activity rapidly declining to light-time levels.

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    Area of Science:

    • Biochemistry
    • Chronobiology
    • Animal Physiology

    Background:

    • The pineal gland produces melatonin, regulating circadian rhythms.
    • N-acetyltransferase (NAT) is a key enzyme in melatonin synthesis.
    • NAT activity in chickens exhibits a daily rhythm, influenced by light-dark cycles.

    Purpose of the Study:

    • To investigate the regulation of N-acetyltransferase (NAT) activity in the chicken pineal gland.
    • To determine if NAT activity changes post-mortem in organ culture.
    • To understand the timing of NAT activity transitions in relation to light exposure.

    Main Methods:

    • Organ culture of chicken pineal glands.
    • Measurement of N-acetyltransferase (NAT) enzyme activity.
    • Controlled light-dark cycle exposure.

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    Main Results:

    • Chicken pineal NAT activity demonstrated a clear circadian rhythm, with high levels during the dark period and low levels during the light period.
    • Organ-cultured pineal glands from chickens killed during the dark phase showed a significant decline in NAT activity, reaching light-time levels.
    • This decline in NAT activity occurred at a consistent time, irrespective of when the chickens were killed within the dark period.

    Conclusions:

    • Chicken pineal N-acetyltransferase (NAT) activity is subject to rapid regulation, likely tied to the onset of light.
    • The enzyme activity transitions to low levels promptly upon exposure to light cues, even in vitro.
    • This suggests a robust mechanism controlling NAT activity in response to environmental light signals.