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Area of Science:

  • Perinatology
  • Fetal Development
  • Respiratory Physiology

Background:

  • Preterm male infants experience higher rates of respiratory insufficiency morbidity and mortality compared to females.
  • Potential sex-based differences in fetal lung architecture and surfactant system maturity are not well-understood.
  • Investigating these differences is crucial for understanding male preterm infant vulnerability.

Purpose of the Study:

  • To compare fetal lung morphology and surfactant system maturity between male and female sheep fetuses at late gestation.
  • To identify any sex-related structural or molecular differences that could explain male disadvantage in respiratory outcomes.

Main Methods:

  • Collected lungs from male and female fetal sheep at 0.9 term for morphological and molecular analysis.
  • Obtained tracheal liquid to determine surfactant phospholipid composition.
  • Analyzed lung tissue for structural parameters, cell proliferation/apoptosis, and extracellular matrix components.

Main Results:

  • No significant sex-related differences were observed in body weight, lung weight, lung volume, tissue/airspace fractions, or micro-architectural features.
  • Gene expression of key surfactant proteins (SP-A, SP-B, SP-C, SP-D) and tropoelastin were similar between sexes.
  • While major phospholipid classes were comparable, males showed a higher percentage of phosphatidylinositol 38:5.

Conclusions:

  • Fetal lung structure and surfactant phospholipid synthesis do not appear to differ between sexes before birth.
  • The increased respiratory morbidity in preterm males may stem from physiological adaptations required for air-breathing post-delivery.
  • Further research into the transition to air-breathing is warranted to explain sex-based respiratory outcomes.