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Gonadal function in low birth weight infants: a pilot study.

Teresa Sir-Petermann1, Catalina Hitchsfeld, Ethel Codner

  • 1Endocrinology and Metabolism Laboratory, West Division, School of Medicine, University of Chile, Santiago. tsir@med.uchile.cl

Journal of Pediatric Endocrinology & Metabolism : JPEM
|April 25, 2007
PubMed
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Low birth weight girls show altered ovarian function with higher anti-Müllerian hormone (AMH) and estradiol levels. Low birth weight boys exhibit normal testicular function, suggesting ovarian vulnerability in infants with intrauterine growth restriction.

Area of Science:

  • Reproductive Endocrinology
  • Pediatric Endocrinology
  • Neonatology

Background:

  • Intrauterine growth restriction (IUGR) impacts fetal development, potentially affecting gonadal function.
  • Assessing early-life gonadal function is crucial for understanding long-term reproductive health outcomes.
  • Anti-Müllerian hormone (AMH) serves as a marker for ovarian follicular reserve and Sertoli cell function.

Purpose of the Study:

  • To compare gonadal function and AMH levels in low birth weight (low-BW) versus normal birth weight (normal-BW) infants during the first three months of life.
  • To investigate potential sex-specific differences in the impact of low birth weight on early gonadal development.
  • To evaluate the response of the pituitary-gonadal axis to GnRH agonist stimulation in these infant groups.

Main Methods:

Related Experiment Videos

  • Studied 20 low-BW and 29 normal-BW infants within the first 3 months postnatally.
  • Evaluated the pituitary-gonadal axis using a GnRH agonist stimulation test (leuprolide acetate).
  • Measured serum concentrations of gonadotropins, steroid hormones, sex hormone-binding globulin, inhibin B, and AMH via specific assays.

Main Results:

  • Basal AMH concentrations were significantly higher in low-BW females compared to normal-BW females (p = 0.004), but not in males.
  • Post-stimulation, estradiol levels were higher in low-BW females (p = 0.043).
  • Post-stimulation 17-hydroxyprogesterone (17-OHP) was higher in low-BW males (p = 0.023), while other sex steroids were similar.

Conclusions:

  • Elevated AMH and estradiol in low-BW girls suggest altered follicular development, indicating potential ovarian vulnerability.
  • Normal AMH and inhibin B levels in low-BW boys suggest preserved Sertoli cell function and normal testicular development.
  • Infants with intrauterine growth restriction may experience greater vulnerability in ovarian function compared to testicular function during early life.