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Related Experiment Videos

Progressive decrease in serum sex hormone-binding globulin from infancy to late prepuberty in boys.

A Belgorosky, M A Rivarola

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

    Serum sex hormone-binding globulin (SHBG) decreases with age in boys, increasing sex hormone access to tissues like the brain. This may trigger puberty onset.

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    Area of Science:

    • Pediatric Endocrinology
    • Reproductive Biology
    • Neuroendocrinology

    Background:

    • Sex hormone-binding globulin (SHBG) regulates the bioavailability of sex hormones.
    • Understanding SHBG dynamics is crucial for comprehending pubertal development.
    • Previous research has not fully elucidated SHBG changes during early puberty.

    Purpose of the Study:

    • To investigate serum SHBG levels and dihydrotestosterone binding affinity in prepubertal boys.
    • To determine the relationship between SHBG levels, age, and pubertal stage.
    • To explore the potential impact of SHBG changes on sex hormone availability to tissues.

    Main Methods:

    • Serum SHBG levels and SHBG-dihydrotestosterone affinity constant (Ka) were measured.
    • Study included 91 boys aged 3 months to 15 years at Tanner stage I.

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  • Statistical analysis was performed to assess age-related trends.

    • Main Results:

    • Serum SHBG levels showed a significant decrease with increasing age.
    • Serum testosterone levels remained unchanged across the age range.
    • SHBG-dihydrotestosterone affinity constant (Ka) did not significantly differ with age.

    Conclusions:

    • Decreasing SHBG levels with age increase the availability of unbound sex hormones to tissues, including the brain.
    • This mechanism may play a physiological role in initiating puberty.
    • Age-related changes in SHBG are a key factor in modulating androgen and estrogen milieu during development.