title: Acceleration of widespread adenoviral gene transfer to intact rabbit hearts by coronary perfusion with low calcium and serotonin.
abstract: Previous attempts at adenoviral gene transfer to the intact heart have been limited by the requirement for prolonged exposure to high virus concentrations. In an ex vivo coronary perfusion model of intact adult rabbit hearts, we previously reported gene transfer to 96% of cardiac myocytes after a 60 min exposure to 1.6 x 10(9) p.f.u./ml Ad beta gal, a recombinant adenovirus encoding beta-galactosidase. Here we sought to decrease the virus exposure time by enhancing microvascular permeability to increase the efficiency of adenoviral gene transfer. Baseline perfusion with 1.0 x 10(8) p.f.u./ml Ad beta gal in normal Krebs solution (1 mM calcium) caused infection of 22% of myocytes at 30 min and 40% at 60 and 120 min. Increasing the virus concentration, decreasing perfusate calcium concentration, or pretreating with serotonin or bradykinin in Krebs solution or L-NAME in heparinized rabbit blood significantly decreased the necessary exposure time. Under optimal conditions of serotonin pretreatment, 50 mumol/l perfusate calcium, and a virus concentration of 1.6 x 10(9) p.f.u./ml, 2 min of coronary perfusion sufficed to produce near-total infection. This profound enhancement of infection parameters has important implications for in vivo myocardial gene transfer, where a similar strategy could facilitate gene therapy for common myocardial disorders.
authors.affiliation: Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
authors.forename: J K
authors.initials: JK
authors.lastname: Donahue
authors.forename: K
authors.initials: K
authors.lastname: Kikkawa
authors.forename: A D
authors.initials: AD
authors.lastname: Thomas
authors.forename: E
authors.initials: E
authors.lastname: Marban
authors.forename: J H
authors.initials: JH
authors.lastname: Lawrence
mesh_terms: D000256:Adenoviridae / Q000235:genetics*; D000818:Animals; D001920:Bradykinin / Q000494:pharmacology; D002118:Calcium; D009202:Cardiomyopathies / Q000628:therapy; D003326:Coronary Circulation / Q000187:drug effects; D018014:Gene Transfer Techniques; D015316:Genetic Therapy; D005822:Genetic Vectors; D006321:Heart / Q000187:drug effects / Q000821:virology*; D066298:In Vitro Techniques; D019331:NG-Nitroarginine Methyl Ester / Q000494:pharmacology; D010477:Perfusion / Q000379:methods*; D010539:Permeability; D011817:Rabbits; D012701:Serotonin / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D012701:Serotonin; D001920:Bradykinin; D002118:Calcium; D019331:NG-Nitroarginine Methyl Ester