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Published on: October 19, 2013

Hypoxia-induced intrauterine growth retardation: effects on pulmonary development and surfactant protein

L Gortner1, A Hilgendorff, T Bähner

  • 1Department of Pediatrics and Neonatology, University of Saarland, Homburg/Saar, Germany. kilgor@uniklinik-saarland.de

Biology of the Neonate
|May 24, 2005
PubMed

Insights

Hypoxia-induced intrauterine growth restriction (IUGR) in mice significantly reduced surfactant protein gene expression, impacting lung development. This finding suggests a link between altered surfactant production and pulmonary issues in preterm infants with IUGR.

Area of Science:

  • Perinatal medicine
  • Developmental biology
  • Pulmonary research

Background:

  • Intrauterine growth retardation (IUGR) in preterm infants increases the risk of pulmonary disorders like bronchopulmonary dysplasia (BPD).
  • A reproducible animal model using hypoxia was established to study IUGR's effects on fetal lung development.

Purpose of the Study:

  • To investigate the impact of IUGR, induced by maternal hypoxia, on pulmonary development and maturation in a mouse model.
  • To assess changes in somatic growth and surfactant protein gene expression.

Main Methods:

  • Mice were exposed to hypoxia (FiO2 0.10) from day 14 to 17.5 of gestation, with a normoxic control group.
  • Somatic growth parameters were measured, and histomorphometric analyses of lung tissue were performed.
  • Quantitative rt-PCR was used to determine the mRNA expression of surfactant proteins (SP-A, -B, -C, -D).

Main Results:

  • Hypoxic fetuses exhibited significantly reduced birth weight, body length, and fronto-occipital diameter compared to controls.
  • Histomorphometric analysis showed no significant differences in lung tissue structure between groups.
  • mRNA expression of SP-A, SP-B, and SP-C was significantly decreased in hypoxic fetuses, while SP-D expression remained unchanged.

Conclusions:

  • Maternal hypoxia during late gestation induces IUGR in preterm mice, altering the developing surfactant system.
  • Reduced surfactant protein gene expression is a key finding, potentially contributing to pulmonary complications in IUGR infants.
  • This model highlights the critical role of the surfactant system in IUGR-related pulmonary disorders.
Abstract

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