Maternal protein restriction during perinatal life affects lung mechanics and the surfactant system during early...

Area of Science:

• Neonatal physiology
• Pulmonary development
• Reproductive biology

Background:

• Fetal growth retardation (FGR) is a condition with limited understanding of its sex-specific effects on neonatal lungs.
• Investigating FGR's impact on lung mechanics and the surfactant system is crucial for neonatal health outcomes.

Purpose of the Study:

• To test the hypothesis that FGR alters lung mechanics and the surfactant system in a sex-specific manner during the neonatal period.
• To analyze the effects of a maternal low protein diet during gestation and lactation on offspring pulmonary function.

Main Methods:

• A rat model of FGR was established using a low protein diet in dams.
• Lung mechanics were assessed using a FlexiVent ventilator in male and female pups at postnatal days 7 and 21.
• Surfactant pool size, subfractions, and surface tension-reducing ability were analyzed from lung lavage samples.

Main Results:

• Female FGR offspring exhibited significantly lower lung compliance and higher tissue elastance at postnatal day 21 compared to controls.
• Female offspring from the low protein diet showed reduced surfactant pool sizes at postnatal day 1.
• These pulmonary and surfactant alterations were not observed in male offspring.

Conclusions:

• Fetal growth retardation has a differential impact on pulmonary function and surfactant composition in female versus male neonates.
• The findings highlight sex-specific vulnerabilities in lung development following FGR.
• Further research is warranted to understand the long-term implications of these sex-based differences.