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J Clin Endocrinol Metab. 2006 Mar;91(3):892-8. Epub 2005 Dec 13.

Hypothalamic and gonadal components of hypogonadism in boys with Prader-Labhart- Willi syndrome.

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1
Institute Growth Puberty Adolescence, Moehrlistrasse 69, CH-8006 Zurich, Switzerland. mail@childgrowth.org

Abstract

CONTEXT:

The specific form of hypogonadism in Prader-Labhart-Willi syndrome (PWS), central or peripheral, remains unexplained.

OBJECTIVES:

The objectives of this study were to investigate the cause of hypogonadism in PWS and determine whether human chorionic gonadotropin (hCG) treatment can restore pubertal development.

DESIGN:

This was a clinical follow-up study, divided into two samples, over a duration of 1.5 and 4.5 yr.

PATIENTS:

Eight male infants and six peripubertal boys (age at start of observation, 0.06-0.93 and 8.1-10.8 yr, respectively) with genetically confirmed PWS were studied.

INTERVENTION:

hCG (500-1500 U twice weekly) was given from age 13.5 yr to the present.

MAIN OUTCOME MEASURES:

Serum FSH, LH, inhibin B, and testosterone levels and pubertal development were the main outcome measures.

RESULTS:

Infants with PWS presented normal LH (2.3 +/- 0.7 U/liter) and testosterone (2.5 +/- 0.9 nmol/liter) levels (mean +/- sem at 5 months) compared with the reference range. However, two thirds of the boys displayed cryptorchidism. Inhibin B levels were at the lowest level of the normal range and decreased significantly between infancy and puberty (at 13 yr, 72 +/- 17 pg/ml), whereas FSH secretion increased (9.9 +/- 2.6 U/liter). Pubertal maturation stopped at an average bone age of 13.9 yr. hCG therapy increased testosterone (11 +/- 2 nmol/liter) and reduced FSH (at 16 yr, 1.1 +/- 0.9 U/liter) levels. Testicular volume (5.6 +/- 1 ml) and inhibin B (26.5 +/- 11.9 pg/ml) remained low.

CONCLUSION:

Children with PWS display a specific form of combined hypothalamic (low LH) and peripheral (low inhibin B and high FSH) hypogonadism, suggesting a primary defect in Sertoli and/or germ cell maturation or an early germ cell loss. hCG therapy stimulates testosterone production and virilization.

PMID:
16352691
DOI:
10.1210/jc.2005-0902
[Indexed for MEDLINE]
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