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Related Experiment Videos

Human ovulation and plasma oxytocin.

P Kumaresan, M Kumaresan, M Hossini

    International Journal of Gynaecology and Obstetrics: the Official Organ of the International Federation of Gynaecology and Obstetrics
    |October 1, 1983
    PubMed
    Summary
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    Plasma oxytocin (OT) levels fluctuate during the menstrual cycle, peaking around day 10 and correlating with luteinizing hormone (LH) and follicle-stimulating hormone (FSH) peaks. These findings suggest OT plays a role in ovulation and menstrual cycle regulation.

    Area of Science:

    • Reproductive Endocrinology
    • Neuroendocrinology

    Background:

    • Hormonal fluctuations significantly influence the female reproductive cycle.
    • The precise role of oxytocin (OT) in human ovulation and menstrual cycle regulation remains incompletely understood.

    Purpose of the Study:

    • To investigate the dynamic changes in plasma oxytocin (OT) concentrations throughout the normal menstrual cycle.
    • To explore the relationship between OT levels and key ovulatory hormones like LH, FSH, estradiol, and progesterone.

    Main Methods:

    • Plasma OT concentrations were quantified using a radioimmunoassay (RIA) method without prior plasma extraction.
    • Measurements were taken in 11 healthy menstruating women across different phases of their menstrual cycle.

    Main Results:

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    • Plasma OT levels exhibited a significant rise from day 7, peaking around day 10 (20 +/- 5 microU/ml).
    • OT levels decreased by the day of the LH peak (13 +/- 6 microU/ml) and further declined before rising again.
    • Higher OT concentrations were observed during the follicular phase compared to the luteal phase.
    • In one individual, peak OT levels coincided with LH and FSH peaks, followed by an abrupt decline.

    Conclusions:

    • Oxytocin (OT) may play a role in human ovulation, potentially acting synergistically with other ovulatory factors.
    • Ovarian hormones, specifically estradiol and progesterone, appear to regulate OT secretion.
    • OT may also be involved in the regulation of luteolysis and the overall menstrual cycle in women.