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The pineal and pubertal development.

P C Sizonenko, U Lang, R W Rivest

    Ciba Foundation Symposium
    |January 1, 1985
    PubMed
    Summary
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    Melatonin, a pineal gland hormone, delays sexual maturation in young rats. This effect is temporary and timing-dependent, suggesting melatonin influences the timing of puberty.

    Area of Science:

    • Endocrinology
    • Neuroscience
    • Reproductive Biology

    Background:

    • The pineal gland hormone melatonin influences seasonal breeding in various species.
    • Previous research suggests melatonin affects sexual development, but its role in humans remains unclear.

    Purpose of the Study:

    • To investigate the effects of melatonin administration on sexual development and maturation in laboratory rats.
    • To determine the sensitivity of rats to melatonin during sexual maturation and identify potential mechanisms of action.

    Main Methods:

    • Daily administration of melatonin to male and female rats during the prepubertal period.
    • Observation of sexual development milestones, including vaginal opening and estrous cyclicity.
    • Analysis of the timing of melatonin injection relative to its effects.

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    Main Results:

    • Melatonin administration delayed sexual maturation in both male and female rats, with maximal effects observed when injected during the late photoperiod.
    • The inhibitory effect was temporary, with normal but delayed sexual development occurring after 45 days of age.
    • In female rats, melatonin disrupted normal estrous cyclicity.
    • No evidence of altered melatonin secretion during human puberty was found.

    Conclusions:

    • Melatonin plays a significant role in timing sexual maturation in rats.
    • The effects of melatonin are likely mediated at the hypothalamic level, potentially by interfering with gonadotropin-releasing hormone secretion.
    • Further research is needed to elucidate the precise mechanisms and potential relevance in humans.