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Updated: May 26, 2026
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iPSC-Derived Epithelial, Mesenchymal, Endothelial, and Immune Cell Co-Culture to Model Airway Barrier Integrity in Lung Health and Disease
Published on: December 6, 2024
Glucocorticoids enhance airway epithelial barrier integrity
Akiko Sekiyama1, Yasuhiro Gon, Masahiro Terakado
1Division of Respiratory Medicine, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan.
International Immunopharmacology
|January 3, 2012
Summary
Glucocorticoids (GCs) improve airway epithelial barrier integrity in asthma by enhancing tight junction formation. This effect, mediated by epidermal growth factor receptor (EGFR) phosphorylation, suggests GCs contribute to asthma treatment.
Area of Science:
- Pulmonary Medicine
- Cell Biology
- Pharmacology
Background:
- Asthma is a chronic airway inflammatory disease with incompletely understood pathogenesis.
- Epithelial barrier damage is a key feature in asthma.
- Glucocorticoids (GCs) are primary anti-inflammatory asthma treatments, but their effect on airway epithelial barriers is unclear.
Purpose of the Study:
- To evaluate the effects of GCs on human airway epithelial barrier function.
- To investigate the role of epidermal growth factor receptor (EGFR) in GC-mediated barrier effects.
Main Methods:
- Cultured human airway epithelial cells (Calu-3 and 16HBE) were treated with GCs (dexamethasone, fluticasone propionate, budesonide).
- Barrier integrity was assessed by measuring transepithelial electrical resistance and fluorescein isothiocyanate-labeled dextran permeability.
- Immunocytostaining and small interfering RNA (siRNA) knockdown of EGFR were used to study molecular mechanisms.
Main Results:
- GC treatment dose-dependently increased epithelial barrier integrity, reducing permeability.
- Dexamethasone enhanced tight junction formation in polarized epithelial cells.
- EGFR knockdown partially blocked dexamethasone's effects, and dexamethasone enhanced EGFR phosphorylation, not expression.
Conclusions:
- Inhaled glucocorticoid therapy can significantly improve airway epithelial barrier integrity.
- The mechanism involves enhanced tight junction formation, potentially mediated by EGFR signaling.
- Improved barrier function likely contributes to the therapeutic efficacy of GCs in asthma management.
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