Closed-circuit organ perfusion technique for gene transfer into the lungs.An experimental trial on farm pigs

Background In an attempt to develop gene therapy for lung diseases, we have explored a closed-circuit surgical perfusion method for gene transfer into the lung. Materials and methods For gene transfer we used a replication defective typ e 5 adenovirus carrying the E. coli beta -galactosidase gene as a reporter gene. The middle lobe of the right lung of eight young farm pigs was perfus ed in vivo via thoracotomy for up to 60 min with the viral solution. The ge ne transfer was performed using a closed-circuit organ perfusion method in vivo. The efficiency of gene transfer was assessed visually by analysis of histologic sections after X-gal, PAS and immunohistochemical stainings. Results The lung perfusion resulted in transgene expression in the alveolar epithelial cells, capillary endothelial cells, airway epithelial cells and alveolar macrophages of the lung examined seven days after perfusion. Conclusion The present results suggest that operatively performed closed-ci rcuit warm lung perfusion method may be used for gene transfer in treatment of diseases that have pulmonary manifestations.