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Enhanced activity of the pituitary-gonadal axis in premature human infants
Insights
Premature birth impacts infant hormone levels. Preterm girls show higher pituitary gonadotropin production, while preterm boys exhibit increased testosterone, highlighting the importance of late gestation for hormonal development.
Area of Science:
- Endocrinology
- Neonatal Physiology
- Reproductive Medicine
Background:
- The hypothalamic-pituitary-gonadal (HPG) axis undergoes significant maturation during late gestation.
- Premature birth may disrupt this crucial developmental window, potentially affecting postnatal endocrine function.
Purpose of the Study:
- To investigate the postnatal pituitary-gonadal function in premature versus fullterm infants.
- To compare serum levels of follicle-stimulating hormone (FSH), luteinizing hormone (LH), prolactin (PRL), and testosterone (T) between these groups.
Main Methods:
- Serum hormone levels (FSH, LH, PRL, T) were measured in fullterm (40 weeks) and premature (32 weeks) male and female infants.
- Measurements were taken during the first 25 weeks of postnatal life.
Main Results:
- Premature girls exhibited significantly higher FSH and LH levels compared to fullterm girls in the first 10 weeks.
- No significant differences in gonadotropin levels were observed between premature and fullterm boys.
- Premature boys showed significantly higher serum testosterone levels between 11-15 weeks of age compared to fullterm boys.
Conclusions:
- The final weeks of gestation are critical for the maturation of the fetal HPG axis.
- Premature birth leads to altered pituitary gonadotropin secretion in girls and enhanced testicular testosterone production in boys.
- These findings underscore the impact of gestational age on early endocrine development and function.
Abstract:
The postnatal pituitary-gonadal function of fullterm and premature boys and girls (mean gestational age, 40 and 32 weeks, respectively) was studied by measurements of serum FSH, LH, PRL, and testosterone (T) between 0-25 weeks of postnatal age. During the first 10 postnatal weeks, serum FSH in premature girls reached 10-20 times higher levels than in fullterm girls (mean at 1-5 weeks, 63 and 3.9 mIU/ml, respectively; P < 1.001). During the same time, serum LH levels were 3-4 times higher in premature (12-17 mIU/ml) than in fullterm girls (3.8-4.7 mIU/ml; P < 0.01). In contrast, no difference in serum gonadotropin levels were observed between premature and fullterm boys. Serum T in premature boys (mean, 2.95 ng/ml) reached a significantly higher level (P < 0.01) than in fullterm boys (1.45 ng/ml) from 11-15 weeks of age. The results emphasize the importance of the last weeks of gestation for the functional maturation of the fetal hypothalamic-pituitary-gonadal axis. Interruption of this maturational process by premature birth results in enhanced pituitary gonadotropin production in girls and increased testicular T production in boys.