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Endocrine changes and urinary citrate excretion.

M L Hammar, G E Berg, L Larsson

    Scandinavian Journal of Urology and Nephrology
    |January 1, 1987
    PubMed
    Summary
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    Urinary citrate is crucial for preventing calcium stones. This study found that sex hormones do not explain why women excrete more citrate than men, despite its importance in stone prevention.

    Area of Science:

    • Nephrology
    • Endocrinology
    • Urology

    Background:

    • Urinary citrate inhibits calcium stone formation by affecting ion-activity products.
    • Women have lower rates of calcium stones and higher urinary citrate excretion than men, suggesting a role for sex steroids.

    Purpose of the Study:

    • To investigate the influence of sex steroids on urinary citrate excretion in postmenopausal women, pregnant women, and men undergoing orchidectomy.

    Main Methods:

    • Analysis of urinary citrate and creatinine levels before and after hormonal treatments (estrogen, medroxyprogesterone acetate) in women.
    • Measurement of urinary citrate and creatinine in men before and after orchidectomy.
    • Comparison of citrate excretion across different physiological states and treatments.

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    Main Results:

    • Pregnancy and orchidectomy did not significantly alter urinary citrate or citrate-to-creatinine ratios.
    • Hormonal treatments with estrogen or estrogen/medroxyprogesterone acetate did not affect these urinary variables.
    • The observed differences in citrate excretion between sexes could not be explained by the effects of sex steroids.

    Conclusions:

    • Sex steroids do not appear to be the primary factor responsible for the higher urinary citrate excretion observed in women compared to men.
    • Further research is needed to elucidate the mechanisms underlying sex-based differences in citrate excretion and their implications for kidney stone disease.