Experimental models and animal studies of fetal proinflammatory exposures produce which effect on surfactant?

• A. Diminished postnatal lung function
• B. Increased incidence of respiratory distress syndrome
• C. No effect
• D. Significant increases in surfactant synthesis

Answer: (D)

Fetal inflammatory exposures accelerate lung maturation by increasing surfactant production. In experimental models, exposure to inflammatory stimuli or infection signals ramps up the activity of type II alveolar cells, boosting transcription of surfactant proteins and phospholipid synthesis. This pre-birth upregulation leads to higher surfactant stores at birth, which helps stabilize alveoli and reduces the risk or severity of respiratory distress syndrome after delivery. So the most supported outcome is a significant increase in surfactant synthesis. The other possibilities don’t fit with this inflammatory maturation effect: inflammation tends to enhance, not diminish, surfactant production, making no effect unlikely and suggesting a lower risk of RDS rather than an increased incidence.