title: HO-1 expression in type II pneumocytes after transpulmonary gene delivery.
abstract: Somatic cell gene transfer is a potentially useful strategy to alter lung function. However, achieving efficient transfer to the alveolar epithelium, especially in smaller animals, has not been demonstrated. In this study, the rat heme oxygenase-1 (HO-1) gene was delivered to the lungs of neonatal mice via transpulmonary injection. A bidirectional promoter construct coexpressing both HO-1 and a luciferase reporter gene was used so that in vivo gene expression patterns could be monitored in real time. HO-1 expression levels were also modulated with doxycycline and assessed in vivo with bioluminescent light transmitted through the tissues from the coregulated luciferase reporter. As a model of oxidative stress and HO-1-mediated protection, groups of animals were exposed to hyperoxia. After gene transfer, elevated levels of HO-1 were detected predominantly in alveolar type II cells by immunocytochemistry. With overexpression of HO-1, increased oxidative injury was observed. Furthermore, this model demonstrated a cell-specific effect of lung HO-1 overexpression in oxidative stress. Specific control of expression for therapeutic genes is possible in vivo. The transpulmonary approach may prove useful in targeting gene expression to cells of the alveolar epithelium or to circumscribed areas of the lung.
authors.affiliation: Department of Pediatrics, Stanford University School of Medicine, Palo Alto, California 94304, USA.
authors.forename: Y H
authors.initials: YH
authors.lastname: Weng
authors.forename: A
authors.initials: A
authors.lastname: Tatarov
authors.forename: B P
authors.initials: BP
authors.lastname: Bartos
authors.forename: C H
authors.initials: CH
authors.lastname: Contag
authors.forename: P A
authors.initials: PA
authors.lastname: Dennery
mesh_terms: D000818:Animals; D000831:Animals, Newborn / Q000378:metabolism; D003199:Computer Systems; D004318:Doxycycline / Q000494:pharmacology; D015870:Gene Expression / Q000187:drug effects; D018014:Gene Transfer Techniques; D006419:Heme Oxygenase (Decyclizing) / Q000235:genetics* / Q000378:metabolism*; D051547:Heme Oxygenase-1; D018496:Hyperoxia / Q000378:metabolism; D007267:Injections; D007501:Iron / Q000378:metabolism; D008168:Lung / Q000166:cytology / Q000201:enzymology*; D008565:Membrane Proteins; D051379:Mice; D008810:Mice, Inbred C57BL; D018384:Oxidative Stress / Q000502:physiology; D011650:Pulmonary Alveoli / Q000166:cytology / Q000201:enzymology; D051381:Rats; D019076:Transgenes / Q000235:genetics; D015854:Up-Regulation
chemical_list: D008565:Membrane Proteins; D007501:Iron; D006419:Heme Oxygenase (Decyclizing); D051547:Heme Oxygenase-1; C496542:Hmox1 protein, mouse; D004318:Doxycycline