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Related Experiment Videos

Hormonal changes around the parturition in rats

T Yoshida, H Suzuki, Y Hattori

    The Tohoku Journal of Experimental Medicine
    |September 1, 1981
    PubMed
    Summary

    Serum hormone levels in pregnant rats were measured. Progesterone decreased, while cortisol increased around parturition, suggesting roles in initiating labor.

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    Area of Science:

    • Reproductive biology
    • Endocrinology
    • Animal physiology

    Background:

    • Hormonal changes are critical during mammalian pregnancy and parturition.
    • Understanding the specific roles of hormones like oxytocin, cortisol, progesterone, and estradiol is key to deciphering labor initiation.

    Purpose of the Study:

    • To quantify serum concentrations of key hormones in pregnant rats.
    • To investigate hormonal fluctuations during the progression of pregnancy and around the time of parturition.

    Main Methods:

    • Radioimmunoassay (RIA) was employed to measure serum hormone levels.
    • Hormone concentrations were analyzed throughout pregnancy and near parturition.

    Main Results:

    • Serum levels of oxytocin, cortisol, progesterone, and estradiol generally increased during pregnancy.
    • In the period surrounding parturition, oxytocin and estradiol showed no significant change, cortisol levels increased, and progesterone levels markedly decreased.

    Conclusions:

    • The observed hormonal shifts, particularly the decline in progesterone and rise in cortisol, may play a role in triggering the onset of labor in rats.
    • Further research is warranted to elucidate the precise mechanisms by which these hormones initiate parturition.

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