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Development of the hypothalamic-pituitary-adrenal axis in the fetus and preterm infant

R J Bolt1, M M van Weissenbruch, H N Lafeber

  • 1Research Institute Endocrinology, Reproduction and Metabolism, Department of Pediatrics, VU University Medical Center, Amsterdam, The Netherlands. Roel.Bolt@VUmc.nl

Journal of Pediatric Endocrinology & Metabolism : JPEM
|July 9, 2002
PubMed

Insights

The developing hypothalamic-pituitary-adrenal (HPA) axis is crucial for fetal maturation, with potential implications for neonatal health. Immaturity of the HPA axis in preterm infants may contribute to neonatal morbidity.

Area of Science:

  • Endocrinology
  • Developmental Biology
  • Neonatology

Background:

  • The hypothalamic-pituitary-adrenal (HPA) axis undergoes complex development in the human fetus.
  • The feto-placental unit plays a role in fetal organ maturation, including a potential cortisol surge for lung development.
  • Fetal HPA axis function differs from adult function, notably due to reduced 3beta-hydroxysteroid dehydrogenase in the fetal adrenal cortex.

Purpose of the Study:

  • To review the developmental trajectory of the HPA axis in fetuses.
  • To examine HPA axis function in preterm infants.
  • To discuss the potential link between HPA axis immaturity and neonatal morbidity.

Main Methods:

  • Literature review of fetal and neonatal HPA axis development.
  • Analysis of functional differences between fetal and adult HPA axes.
  • Exploration of the impact of HPA axis maturation on neonatal outcomes.

Main Results:

  • The HPA axis development is intricate, with specific maturational roles for the feto-placental unit.
  • Significant functional distinctions exist between fetal and adult HPA axis activity.
  • HPA axis immaturity at birth, particularly in preterm infants, is associated with increased neonatal morbidity.

Conclusions:

  • The development of the HPA axis is critical for fetal maturation and adaptation to extra-uterine life.
  • Immaturity of the central and adrenal components of the HPA axis in preterm infants is a significant concern.
  • Understanding HPA axis development and its potential immaturity is key to addressing neonatal morbidity.

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