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Chronic in utero beta-blockade alters fetal lung development
1Department of Pediatrics, Tufts University School of Medicine, New England Medical Center Hospitals, Boston, MA 02111.
Developmental Pharmacology and Therapeutics
|January 1, 1992
Summary
Prenatal exposure to propranolol impairs lung development in fetal rats, affecting water clearance and surfactant secretion. This beta-blockade impacts lung function post-birth.
Area of Science:
- Pharmacology
- Developmental Biology
- Respiratory Physiology
Background:
- Beta-blockers like propranolol cross the placenta.
- Fetal lung development is sensitive to maternal health and medication exposure.
Purpose of the Study:
- To investigate the effects of prenatal propranolol exposure on fetal and postnatal lung development in rats.
- To assess impacts on lung water clearance and surfactant dynamics.
Main Methods:
- Pregnant rats received propranolol (5 or 10 mg/kg/day) from day 10 of gestation.
- Fetal lungs were analyzed at day 21 via hysterotomy; postnatal pups were studied subsequently.
- Lung wet:dry weight ratios, surfactant pools, synthesis, and secretion were measured.
Main Results:
- Increased lung wet:dry weight ratios in fetuses, indicating impaired water clearance.
- Higher wet:dry ratios in postnatal pups, confirming persistent impaired lung water clearance.
- Decreased surfactant pools and impaired secretory response to beta-agonists in treated pups.
Conclusions:
- Chronic prenatal beta-blockade with propranolol adversely affects fetal lung maturation.
- Impaired lung water clearance and altered surfactant secretion persist postnatally.
- These findings highlight potential risks of beta-blocker use during pregnancy for fetal lung development.