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Prolactin in human cervical mucus.

P H Chan, S Y Chan, P C Ho

    International Journal of Fertility
    |July 1, 1986
    PubMed
    Summary
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    Prolactin (PRL) levels in cervical mucus change cyclically during the menstrual cycle, being lower at midcycle due to increased mucus volume. This finding offers insights into reproductive physiology.

    Area of Science:

    • Reproductive Endocrinology
    • Gynecology

    Background:

    • Prolactin (PRL) is a hormone with known reproductive functions.
    • Cervical mucus composition changes throughout the menstrual cycle.
    • The role of PRL in cervical mucus is not fully understood.

    Purpose of the Study:

    • To investigate the cyclic changes in prolactin levels within cervical mucus.
    • To compare cervical mucus PRL concentrations with plasma PRL levels.
    • To explore the physiological implications of PRL in cervical mucus.

    Main Methods:

    • Studied 19 normal ovulatory women.
    • Measured prolactin concentrations in cervical mucus and plasma.
    • Collected samples across different phases of the menstrual cycle.

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    Main Results:

    • Cervical mucus PRL concentration was generally higher than plasma PRL, except at midcycle.
    • Midcycle cervical mucus showed lower PRL concentration compared to follicular and luteal phases.
    • Total PRL content did not differ significantly between preovulatory, midcycle, and postovulatory samples.
    • Cervical mucus volume significantly increased during the periovulatory period.

    Conclusions:

    • Cervical mucus PRL levels exhibit cyclic variations.
    • The observed decrease in midcycle mucus PRL concentration is likely due to dilution from increased mucus volume.
    • These findings contribute to understanding the physiological role of PRL in human cervical mucus.