Acute host-mediated endothelial injury after adenoviral gene transfer in normal rabbit arteries: impact on transgene expression and endothelial function

Circulation Research
K ChannonS J George

Abstract

Acute injury after adenoviral vascular gene transfer remains incompletely characterized. Here, we describe the early response (< or =days) in 52 New Zealand White rabbits undergoing gene transfer (beta-galactosidase or empty vector) or sham procedures to both carotid arteries. After gene transfer, arteries were either left in vivo for 1 hour to 3 days (in vivo arteries) or were excised immediately after gene transfer and cultured (ex vivo arteries). Within 1 hour, in vivo arteries receiving infectious titers of > or = 4X10(9) plaque-forming units (pfu)/mL showed endothelial activation, with an acute inflammatory infiltrate developing by 6 hours. Ex vivo arteries showed endothelial activation but no inflammatory infiltrate. There were also significant differences in transgene expression between in vivo and ex vivo arteries. Ex vivo arteries showed titer-dependent increases in beta-galactosidase expression through 2X10(10) pfu/mL, whereas in in vivo arteries, titers above 4X10(9) pfu/mL merely increased acute inflammatory response, without increasing transgene expression. In vivo arteries showed significant time- and titer-dependent impairment in endothelium-dependent relaxation, with no effect on contraction or nitroprusside-ind...Continue Reading

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