© 1995 American Heart Association, Inc.
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In Vivo Adenovirus-Mediated Gene Transfer Via the Pulmonary Artery of Rats
From the Molecular Hematology Branch (D.A.D.) and Laboratory of Animal Medicine and Surgery (R.F.H.), National Heart, Lung, and Blood Institute, Bethesda, Md; Cardiovascular Section (R.V.), Armed Forces Institute of Pathology, Washington, DC; and the Departments of Cardiology (S.K.S., J.J.R.) and Surgery (K.D.N.), Children's National Medical Center, Washington, DC.
Correspondence to David A. Dichek, MD, Gladstone Institute of Cardiovascular Disease, UCSF, PO Box 419100, San Francisco, CA 94141-9100.
Abstract Gene transfer into the pulmonary vasculature has the potential to be a powerful technique for both investigation of pulmonary pathophysiology and development of genetic therapies for pulmonary vascular disease. To evaluate the potential for in vivo pulmonary arterial gene transfer, we infused adenoviral vectors into the left pulmonary artery of Sprague-Dawley and cotton rats. Access to the left pulmonary artery was obtained by a percutaneous transcatheter approach or through thoracotomy and pulmonary arteriotomy. With the thoracotomy approach, both pulmonary arterial inflow and pulmonary venous outflow were occluded during vector infusion and throughout a subsequent 20-minute dwell period. The success of gene transfer was assessed by staining for evidence of recombinant gene expression in lungs excised at time points ranging from 48 to 72 hours after virus infusion. With the thoracotomy technique, pulmonary gene transfer was successful in 15% of surviving Sprague-Dawley rats and 30% of surviving cotton rats. Percutaneous catheter-based pulmonary gene transfer was not successful. In rats with pulmonary gene transfer, 1% to 8% of total left lung cells expressed the recombinant gene. Recombinant gene expression was found in endothelial cells (0.2% to 18% of total transduced cells), smooth muscle cells (0% to 3%), macrophages (1% to 7%), airway epithelial cells (2% to 50%), and alveolar epithelial cells (38% to 94%). Investigation of the low rate of successful gene transfer in individual animals suggested that insufficient physical contact between the virions and pulmonary cells was the most likely cause. In vivo gene transfer into the rat pulmonary vasculature can be accomplished with adenovirus vectors. The overall efficiency is low, however, and pulmonary arterial infusion of the vectors results in gene transfer primarily into nonvascular cells.
Key Words: pulmonary artery • pulmonary hypertension • gene transfer • gene therapy • adenovirus
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