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Related Experiment Videos

Melatonin administration: effects on rodent circadian rhythms.

S M Armstrong, J Redman

    Ciba Foundation Symposium
    |January 1, 1985
    PubMed
    Summary

    Melatonin administration can influence rodent circadian activity rhythms, affecting both entrainment and re-entrainment. This suggests the pineal gland

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    Area of Science:

    • Chronobiology
    • Neuroendocrinology
    • Animal Behavior

    Background:

    • Previous research indicated minimal impact of pinealectomy on rodent circadian rhythms.
    • Pharmacological studies on melatonin suggest a more significant role for the pineal gland than previously thought.

    Purpose of the Study:

    • To investigate the effects of melatonin and other substances on rodent circadian activity rhythms.
    • To determine melatonin's potential for entrainment and re-entrainment of circadian rhythms.

    Main Methods:

    • Administered daily injections of melatonin, arginine vasotocin, melanocyte-stimulating hormone, and a beta-blocker to rats.
    • Assessed effects on free-running activity rhythms in constant darkness and re-entrainment after light-dark cycle phase-shifts.
    • Administered melatonin ad libitum in drinking water to rats in constant dim light.

    Main Results:

    • Melatonin demonstrated entrainment properties when injections coincided with the onset of the activity rhythm.
    • Ad libitum melatonin administration appeared to lengthen the free-running period.
    • Melatonin injections altered the direction of re-entrainment after a phase-advance of darkness, while controls phase-delayed.

    Conclusions:

    • Melatonin can influence the direction of circadian rhythm re-entrainment.
    • The pineal gland's role in regulating circadian rhythms may be more significant than previously understood.
    • Findings suggest pharmacological doses of melatonin may inform the function of endogenous melatonin.

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