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Differential effect of dexamethasone and hydrocortisone on alveolar growth in rat pups
Michael Fayon1, Philippe Jouvencel, Dominique Carles
1Pediatric Intensive Care and Pulmonology Unit and Centre de Recherche, Hôpital Pellegrin-Enfants, Bordeaux, France. michael.fayon@chu-bordeaux.fr
Insights
Low-dose hydrocortisone in rat pups may impair lung growth, increasing alveolar diameter but not significantly affecting septation. Dexamethasone showed more pronounced negative effects on lung development.
Area of Science:
- Neonatal Medicine
- Pulmonary Biology
- Pharmacology
Background:
- Glucocorticoids are vital in perinatology, reducing respiratory distress syndrome and chronic lung disease.
- Emerging evidence suggests potential adverse effects on lung growth and development in neonates.
Purpose of the Study:
- To assess the impact of low-dose hydrocortisone on rat pup lung growth.
- To compare hydrocortisone's effects with dexamethasone on alveolar development.
Main Methods:
- Administered low-dose hydrocortisone (1 mg/kg/day for 11 days) to rat pups.
- Compared lung growth parameters, including alveolar diameter and internal surface area, with a dexamethasone group.
Main Results:
- Both hydrocortisone and dexamethasone increased alveolar diameter and thinned interairspace walls.
- Dexamethasone significantly reduced the lung's internal surface area, unlike hydrocortisone.
- Hydrocortisone did not appear to affect alveolar septation, with less severe changes than dexamethasone.
Conclusions:
- Prolonged low-dose hydrocortisone may negatively impact alveolar lung growth in rat pups.
- The detrimental effects of hydrocortisone on lung development are less severe than those of dexamethasone.
Abstract:
Glucocorticoids are widely used in perinatology, since they decrease the incidence of respiratory distress syndrome and chronic lung disease. However, evidence is now increasing that their use in this age group may result in impaired alveolar lung growth and general development. The aim of this study was to determine whether a low dose of hydrocortisone (1 mg/kg/day for 11 days) was deleterious to lung growth in rat pups, as compared to an equivalent dose of dexamethasone. While both dexamethasone and hydrocortisone increased alveolar diameter with thinning of the interairspace walls, only dexamethasone reduced the overall internal surface area of the lung available for respiratory exchange. Changes were more marked with dexamethasone as compared to hydrocortisone, which did not appear to affect alveolar septation. In conclusion, a prolonged course of low-dose hydrocortisone may be deleterious for alveolar lung growth in rat pups, but the changes are less marked than those caused by dexamethasone.