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Related Experiment Videos

Hypogonadism in Prader-Willi syndrome.

N Wannarachue, R H Ruvalcaba

    American Journal of Mental Deficiency
    |March 1, 1975
    PubMed
    Summary

    Sexual development is abnormal in Prader-Willi syndrome, primarily due to hypothalamic-pituitary axis defects. Hormonal evaluations revealed variable but consistently impaired sexual maturation in affected individuals.

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    Effects of growth hormone in Prader-Willi syndrome. A case report.

    Clinical pediatrics·1993

    Area of Science:

    • Endocrinology
    • Genetics
    • Reproductive Medicine

    Background:

    • Prader-Willi syndrome (PWS) is a complex genetic disorder.
    • Individuals with PWS often exhibit delayed or incomplete sexual development.
    • The precise mechanisms underlying sexual dysfunction in PWS require further elucidation.

    Purpose of the Study:

    • To comprehensively evaluate sexual development and hypothalamic-pituitary-gonadal (HPG) axis function in individuals with Prader-Willi syndrome.
    • To investigate the relationship between hormonal responses and the degree of sexual maturation.
    • To explore potential contributing factors to observed abnormalities.

    Main Methods:

    • Assessed sexual development and genital maturation in 11 subjects (9 female, 2 male) with PWS.
    • Evaluated HPG axis function via serum Luteinizing Hormone (LH) and plasma testosterone responses to clomiphene citrate and human chorionic gonadotrophin (hCG) stimulation.
    • Measured vaginal estrogenization, performed testicular biopsies, and analyzed urinary steroid excretion (17 ketosteroids, 17-hydroxycorticosteroids, creatinine).

    Main Results:

    • All subjects displayed variable but abnormal sexual and genital development.
    • HPG axis evaluation showed impaired responses to stimulation.
    • Testicular biopsies revealed germinal epithelium abnormalities; vaginal estrogenization was variable; low 17 ketosteroid excretion and elevated 17-hydroxycorticosteroid/creatinine ratios were noted.

    Conclusions:

    • Sexual development abnormalities in PWS are predominantly caused by defects in the hypothalamic-pituitary axis.
    • Adrenal function was largely normal, with low 17 ketosteroid excretion potentially explaining sparse pubic/axillary hair.
    • Elevated urinary 17-hydroxycorticosteroid/creatinine ratios may reflect muscular abnormalities in PWS patients.

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