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Related Experiment Videos

Calcium-regulating hormones during the menstrual cycle.

R M Pitkin, W A Reynolds, G A Williams

    The Journal of Clinical Endocrinology and Metabolism
    |September 1, 1978
    PubMed
    Summary

    This study reveals that calcium-regulating hormones, parathyroid hormone (PTH) and calcitonin (CT), fluctuate during the menstrual cycle. These hormonal shifts are linked to estrogen levels, impacting calcium metabolism.

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    Area of Science:

    • Endocrinology
    • Reproductive Biology
    • Calcium Metabolism

    Background:

    • Menstrual cycle involves complex hormonal fluctuations.
    • Calcium homeostasis is crucial for overall health.
    • Limited understanding of calcium metabolism regulation during the menstrual cycle.

    Purpose of the Study:

    • To investigate the patterns of calcium metabolism and related hormones throughout the menstrual cycle.
    • To explore the potential influence of estrogen on calcium-regulating hormones.

    Main Methods:

    • Studied seven women over ovulatory cycles.
    • Collected daily or every-other-day fasting blood samples.
    • Measured total calcium, ionic calcium, magnesium, phosphorus, parathyroid hormone (PTH), calcitonin (CT), LH, progesterone, and estradiol.

    Main Results:

    • Parathyroid hormone (PTH) levels peaked pre-ovulation and decreased during the luteal phase.
    • Calcitonin (CT) levels were highest at midcycle.
    • Ionic calcium (Ca++) levels decreased before ovulation and increased afterward; other minerals showed no clear pattern.
    • A prolonged cycle showed three PTH peaks correlating with estradiol elevations.

    Conclusions:

    • This study is the first to report menstrual cyclicity in calcium-regulating hormones.
    • Estrogen likely influences calcium metabolism by modulating PTH and/or CT secretion.
    • Hypothesized mechanisms involve estrogen's effect on bone resorption or calcitonin release, influencing calcium levels and PTH output.

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