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Substrate utilization and kinetics of surfactant metabolism in evolving bronchopulmonary dysplasia

Kimberly L Spence1, James C Zozobrado, Bruce W Patterson

  • 1Division of Newborn Medicine, the Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine, and St. Louis Children's Hospital, St Louis, Missouri 63110, USA.

The Journal of Pediatrics
|October 18, 2005
PubMed

Insights

Surfactant turnover significantly increases in premature infants over time, with greater reliance on plasma palmitate and acetate for synthesis, suggesting reduced phospholipid recycling.

Area of Science:

  • Neonatal physiology
  • Pulmonary medicine
  • Biochemistry

Background:

  • Premature infants often require mechanical ventilation.
  • Pulmonary surfactant is crucial for lung function.
  • Understanding surfactant metabolism is vital for managing respiratory distress.

Purpose of the Study:

  • To quantify pulmonary surfactant turnover in premature infants.
  • To measure precursor utilization for surfactant synthesis.
  • To assess changes in surfactant metabolism over time.

Main Methods:

  • Stable isotopically labeled precursors ([1,2,3,4-13C4] palmitate and [1-13C1] acetate) were infused intravenously.
  • Surfactant phospholipids were analyzed from tracheal aspirates.
  • Fractional catabolic and synthetic rates were determined at different postnatal ages.

Main Results:

  • Fractional catabolic rate of surfactant increased from 25.3% per day at birth to 53.8% per day at 4 weeks.
  • Contribution of plasma palmitate and de novo synthesis to total surfactant synthesis rose from 44.2% to 85.2% over 4 weeks.
  • These changes were statistically significant (P=.001 and P=.03, respectively).

Conclusions:

  • Pulmonary surfactant turnover accelerates in premature infants, particularly those with evolving bronchopulmonary dysplasia.
  • Increased reliance on plasma palmitate and acetate indicates reduced surfactant phospholipid recycling.
  • Findings highlight dynamic changes in surfactant metabolism during early neonatal development.
Abstract

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