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Related Experiment Videos

Calcium-regulating hormones across the menstrual cycle.

K N Muse, S C Manolagas, L J Deftos

    The Journal of Clinical Endocrinology and Metabolism
    |June 1, 1986
    PubMed
    Summary

    This study found no significant changes in parathyroid hormone (PTH), calcitonin (CT), or 1,25-dihydroxyvitamin D [1,25-(OH)2D] levels during the menstrual cycle in women. Calcitropic hormone concentrations remain stable throughout the cycle.

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    Area of Science:

    • Endocrinology
    • Reproductive Biology
    • Mineral Metabolism

    Background:

    • Previous research suggested potential midcycle fluctuations in serum parathyroid hormone (PTH), calcitonin (CT), and 1,25-dihydroxyvitamin D [1,25-(OH)2D] in women.
    • The influence of cyclic ovarian steroid secretion on these calcitropic hormones requires further investigation.

    Purpose of the Study:

    • To investigate the impact of menstrual cycle hormonal shifts on serum concentrations of PTH, CT, and 1,25-(OH)2D.
    • To assess calcitonin (CT) reserve across different phases of the menstrual cycle.

    Main Methods:

    • Daily blood samples were collected from six women throughout their menstrual cycles.
    • Serum concentrations of PTH, CT, and 1,25-(OH)2D were measured using radioimmunoassays (RIAs) and cytoreceptor assays.

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  • Calcitonin (CT) reserve was evaluated via calcium infusion tests during the early follicular, late follicular, and midluteal phases.

    • Main Results:

    • No significant variations in mean serum PTH, CT, 1,25-(OH)2D, calcium, or phosphorus were observed during the menstrual cycle.
    • While serum CT increased significantly after calcium infusion, the response did not differ across the early follicular, late follicular, or midluteal phases.
    • The study did not corroborate prior reports of midcycle elevations in these key calcitropic hormones.

    Conclusions:

    • Serum concentrations of PTH, CT, and 1,25-(OH)2D do not significantly fluctuate throughout the menstrual cycle.
    • Ovarian steroid secretion does not appear to exert a substantial influence on the daily levels of these calcitropic hormones.
    • These findings challenge previous observations regarding midcycle hormonal changes in women.