title: Na,K-ATPase gene transfer increases liquid clearance during ventilation-induced lung injury.
abstract: Mechanical ventilation with high tidal volumes (HVT) downregulates alveolar Na,K-ATPase function and impairs lung liquid clearance. We hypothesized that overexpression of Na,K-ATPase in the alveolar epithelium could counterbalance these changes and increase clearance in a rat model of mild ventilation-induced lung injury. We used a surfactant-based system to deliver 4 x 10(9) plaque-forming units of E1a-/E3- recombinant adenovirus containing either a rat beta1 Na,K-ATPase subunit cDNA (adbeta1) or no cDNA (adnull) to rat lungs 7 days before ventilation with a VT of approximately 40 ml/kg (peak airway pressure of less than 35 cm H2O) for 40 minutes. Lung liquid clearance and Na, K-ATPase activity and protein abundance were increased in HVT adbeta1-infected lungs as compared with sham and adnull-infected HVT lungs. These results suggest that Na,K-ATPase subunit gene overexpression in the alveolar epithelium increases Na,K-ATPase function and lung liquid clearance in a model of HVT. We provide here the first evidence that using a genetic approach improves active Na+ transport and thus liquid clearance in the setting of mild ventilation-induced lung injury.
authors.affiliation: Division of Pulmonary and Critical Care Medicine, Northwestern University Medical School, Chicago, IL 60611, USA.
authors.forename: Yochai
authors.initials: Y
authors.lastname: Adir
authors.forename: Phillip
authors.initials: P
authors.lastname: Factor
authors.forename: Vidas
authors.initials: V
authors.lastname: Dumasius
authors.forename: Karen M
authors.initials: KM
authors.lastname: Ridge
authors.forename: Jacob I
authors.initials: JI
authors.lastname: Sznajder
mesh_terms: D000818:Animals; D015633:Extravascular Lung Water / Q000502:physiology*; D018014:Gene Transfer Techniques; D008171:Lung Diseases / Q000209:etiology / Q000235:genetics / Q000628:therapy*; D008297:Male; D023421:Models, Animal; D011650:Pulmonary Alveoli / Q000503:physiopathology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012121:Respiration, Artificial / Q000009:adverse effects*; D020545:Respiratory Mucosa / Q000503:physiopathology*; D000254:Sodium-Potassium-Exchanging ATPase / Q000235:genetics*
chemical_list: D000254:Sodium-Potassium-Exchanging ATPase