Biologic bypass with the use of adenovirus-mediated gene transfer of the complementary deoxyribonucleic acid for vascular endothelial growth factor 121 improves myocardial perfusion and function in the ischemic porcine heart

The Journal of Thoracic and Cardiovascular Surgery
C A MackT K Rosengart

Abstract

Vascular endothelial growth factor (VEGF), a potent angiogenic mediator, can be delivered to targeted tissues by means of a replication-deficient adenovirus (Ad) vector. We hypothesized that direct administration of Ad vector expressing the VEGF121 complementary deoxyribonucleic acid (AdGVVEGF121.10) into regions of ischemic myocardium would enhance collateral vessel formation and improve regional perfusion and function. Yorkshire swine underwent thoracotomy and placement of an Ameroid constrictor (Research Instruments & MFG, Corvallis, Ore.) on the circumflex coronary artery. Three weeks later, myocardial perfusion and function were assessed by single photon emission computed tomography imaging (SPECT) with 99mTc-labeled sestamibi and by echocardiography during rest and stress. AdGVVEGF121.10 (n = 7) or the control vector, AdNull (n = 8), was administered directly into the myocardium at 10 sites in the circumflex distribution (10(8) pfu/site). Four weeks later, these studies were repeated and ex vivo angiography was performed. SPECT imaging 4 weeks after vector administration demonstrated significant reduction in the ischemic area at stress in AdGVVEFG121.10-treated animals compared with AdNull control animals (p = 0.005). Str...Continue Reading

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