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Ann Thorac Surg 1996;62:425-433
© 1996 The Society of Thoracic Surgeons
Department of Cardiothoracic Surgery, Division of Pulmonary and Critical Care Medicine, and Division of Cardiology, The New York Hospital-Cornell Medical Center, New York, New York
Background. Direct myocardial gene transfer is a modality that involves the introduction of genetic information into myocardial tissue to achieve a therapeutic effect. This study was designed to characterize the temporal and spatial limits of gene expression and to determine the safety of direct myocardial gene transfer in a large animal model using replication-deficient adenovirus vectors.
Methods. Mongrel dogs underwent left thoracotomy and direct myocardial injections (100 µL/injection) of adenovirus vectors (109 pfu) carrying the DNA for the reporter enzyme chloramphenicol acetyl transferase or the angiogenic protein vascular endothelial growth factor. Two to 14 days after vector administration, regional protein expression was evaluated in myocardium and distant organs. Left ventricular function, assessed by echocardiography, and routine hematologic and biochemical indices were evaluated before and after vector administration.
Results. Peak levels of chloramphenicol acetyl transferase activity were detected 2 days after vector administration, and levels above baseline persisted for at least 14 days. Local chloramphenicol acetyl transferase activity was detected at distances at least as far as 1.5 cm from the site of injection. Chloramphenicol acetyl transferase activity in distant organs was less than 0.1% of that in injected myocardium 7 days after vector administration. Localized expression of vascular endothelial growth factor was achieved for up to 7 days after a single vector administration. Cardiac function and laboratory values were unchanged during the study.
Conclusions. Adenovirus-mediated direct myocardial gene transfer can be accomplished safely in a large animal model, providing high levels of protein expression in a greater spatial distribution than previously reported, with minimal transfection of distant organs. Sustained and localized expression of a potent angiogenic mediator has been accomplished, which may provide an innovative strategy to stimulate angiogenesis in ischemic myocardium.
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Ann. Thorac. Surg. 1996 62: 433-434.
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