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[Decrease or increase in maternal blood prolactin concentrations during labor (author's transl)]

T Yaginuma

    Nihon Sanka Fujinka Gakkai Zasshi
    |January 1, 1982
    PubMed
    Summary

    Labor stress can stimulate prolactin release in pregnant individuals. While prolactin typically decreases during labor, intense stress may override this, particularly after delivery, suggesting a complex hormonal response.

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    Area of Science:

    • Endocrinology
    • Reproductive Biology
    • Stress Physiology

    Context:

    • Previous studies noted elevated serum cortisol during labor in term-pregnants.
    • This research investigates prolactin level dynamics in the same cohort.
    • Labor and delivery represent significant physiological stressors.

    Purpose:

    • To examine prolactin level changes during labor and delivery.
    • To explore the relationship between labor-stress intensity and prolactin release.
    • To identify potential inhibitory factors affecting prolactin during labor.

    Summary:

    • Serum prolactin levels significantly decreased from pre-labor baseline (169.1 ng/ml) to immediately before (98.8 ng/ml) and after delivery (116.8 ng/ml).
    • However, a subset of individuals exhibited increased prolactin levels, correlating with substantially higher cortisol increases, indicating potent labor-stress.

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  • This suggests that while unknown factors may inhibit prolactin release, intense labor-stress can stimulate it, especially post-delivery.

    • Impact:

    • Highlights the complex interplay between stress hormones and reproductive hormones during childbirth.
    • Provides insights into stress-induced hormonal modulation in pregnant individuals.
    • Suggests potential mechanisms for prolactin regulation under physiological stress.