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Respiratory syncytial virus causes increased bronchial epithelial permeability
Muna M Kilani1, Kamal A Mohammed, Najmunnisa Nasreen
1Indiana University Medical Center, Indianapolis, USA.
Chest
|July 14, 2004
Summary
Respiratory syncytial virus (RSV) infection increases bronchial airway permeability by inducing vascular endothelial growth factor (VEGF). Blocking VEGF or RSV with antibodies prevented this increased permeability and gap formation in epithelial cells.
Area of Science:
- Pulmonology
- Virology
- Cell Biology
Background:
- Respiratory syncytial virus (RSV) infections trigger disease through cytokine release.
- RSV is a major cause of respiratory illness in infants and young children.
- Bronchial epithelial barrier function is critical for lung health.
Purpose of the Study:
- To investigate the role of vascular endothelial growth factor (VEGF) in RSV-induced bronchial epithelial permeability.
- To determine if VEGF is a key mediator of RSV-induced barrier dysfunction.
Main Methods:
- Human bronchial epithelial cells were infected with RSV.
- Vascular endothelial growth factor (VEGF) and RSV were blocked using specific antibodies (VEGF antibody and palivizumab).
- Epithelial monolayer permeability was measured using electric cell-substrate impedance sensing (ECIS) and live cell imaging.
Main Results:
- RSV infection significantly increased bronchial epithelial monolayer permeability.
- This increase in permeability was significantly reduced by blocking VEGF with a specific antibody.
- RSV-induced intercellular gap formation was also observed and inhibited by VEGF blockade and palivizumab.
Conclusions:
- RSV infection increases bronchial airway epithelial monolayer permeability.
- VEGF induction is a key mechanism by which RSV disrupts the epithelial barrier.
- Targeting VEGF may represent a therapeutic strategy for RSV-induced lung injury.