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Related Experiment Videos

Pineal melatonin concentrations in the Syrian hamster.

E S Panke, M D Rollag, R J Reiter

    Endocrinology
    |January 1, 1979
    PubMed
    Summary

    Gold hamsters show a strong daily rhythm in pineal melatonin. Melatonin levels significantly increase during the dark phase, and this rhythm is abolished by superior cervical ganglionectomy.

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    Area of Science:

    • Chronobiology
    • Neuroendocrinology
    • Mammalian Physiology

    Background:

    • Pineal melatonin production is known to exhibit diurnal rhythmicity.
    • Understanding the regulation of this rhythm is crucial for comprehending circadian biology.

    Purpose of the Study:

    • To investigate the diurnal rhythm of pineal melatonin concentrations in gold hamsters.
    • To determine the role of the superior cervical ganglion in regulating this rhythm.

    Main Methods:

    • Gold hamsters were maintained under a 15-hour light/10-hour darkness cycle.
    • Pineal gland tissue was collected at 3-hour intervals over a 24-hour period.
    • Superior cervical ganglionectomy was performed in a subset of animals to assess its effect on melatonin levels.

    Main Results:

    • Pineal melatonin concentrations showed a marked diurnal rhythm, with significantly higher levels during the dark phase (0200-0500 h).
    • Daytime melatonin levels ranged from 95-232 pg/pineal gland, rising to 760-1335 pg/pineal gland during the early morning hours.
    • Superior cervical ganglionectomy completely abolished the diurnal rhythm, maintaining melatonin levels between 60-105 pg/pineal gland throughout the 24-hour period.

    Conclusions:

    • The diurnal rhythm of pineal melatonin in gold hamsters is robust and strongly influenced by the light-dark cycle.
    • The superior cervical ganglion plays a critical role in mediating the rhythm of pineal melatonin production.

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