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Related Experiment Videos

Human testis does not secrete oestrone sulphate.

F C Wu, I A Swanston, T B Hargreave

    The Journal of Endocrinology
    |February 1, 1982
    PubMed
    Summary
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    This study shows the testes secrete testosterone, androstenedione, estradiol-17 beta, and estrone. Minimal testicular secretion of estrone sulfate suggests it originates from other steroid conversions.

    Area of Science:

    • Endocrinology
    • Reproductive Biology
    • Steroid Metabolism

    Background:

    • The testes are known endocrine organs, but the precise contribution of testicular secretion versus peripheral conversion to circulating steroid levels requires further elucidation.
    • Understanding steroid production is crucial for reproductive health and diagnosing endocrine disorders.

    Purpose of the Study:

    • To quantify the secretion of specific steroids from the testes.
    • To compare testicular venous concentrations with peripheral venous concentrations for key androgens and estrogens.
    • To investigate the origin of circulating estrone and estrone sulfate.

    Main Methods:

    • Blood samples were collected from the spermatic vein and antecubital vein of 17 men undergoing varicocele ligation.
    • Concentrations of testosterone, androstenedione, estradiol-17 beta, estrone, and estrone sulfate were measured in plasma samples.

    Related Experiment Videos

  • Ratios of mean concentrations in spermatic venous plasma to peripheral venous plasma were calculated to assess testicular secretion.

    • Main Results:

    • Significant testicular secretion was observed for testosterone (ratio 77.2), androstenedione (ratio 9.1), estradiol-17 beta (ratio 28.7), and estrone (ratio 1.6).
    • Testicular secretion of estrone sulfate was minimal, with a mean concentration ratio of 1.07.
    • The findings indicate that circulating estrone and estrone sulfate are primarily derived from peripheral conversion of precursor steroids.

    Conclusions:

    • The testes are a major source of circulating testosterone, androstenedione, and estradiol-17 beta.
    • Peripheral conversion plays a more significant role in the production of circulating estrone and estrone sulfate than direct testicular secretion.
    • These findings contribute to a comprehensive understanding of steroid hormone synthesis and metabolism in men.