title: Adenoviral serotype 5 vectors pseudotyped with fibers from subgroup D show modified tropism in vitro and in vivo.
abstract: Adenovirus (Ad5) serotype 5 vectors are commonly used for gene transfer. Preclinical studies have shown that their application to systemic gene delivery, however, is limited by their highly efficient uptake in the liver, principally mediated by receptor-binding sites on the fiber shaft and knob domain. Using Ad to target other sites in vivo requires vectors that lack hepatic tropism. We therefore sought to exploit Ad family diversity to isolate vectors that possessed poor hepatic tropism. We pseudotyped the fibers from Ad16 (subgroup B; Ad5/16), Ad19p (subgroup D; Ad5/19p), and Ad37 (subgroup D; Ad5/37) onto Ad5 capsids and assessed infectivity profiles in vitro in multiple cell types and in vivo in rats. In rat, mouse, and human hepatocytes, Ad5/19p and Ad5/37 both possessed a striking lack of hepatic cell infectivity compared with Ad5. Both vectors were, however, able to transduce human vascular endothelial and smooth muscle cells with efficiencies equal to or greater than that of nonmodified Ad5. We evaluated liver uptake in 12-week-old male rats after intravenous injection. In contrast to a vector with the wild-type Ad5 fiber, Ad5, both Ad5/19p and Ad5/37 produced significantly less virion accumulation (measured at 1 hr and 5 days) and transgene expression in the liver. Thus, Ad5/19p and Ad5/37 may be useful platforms for the development of targeted Ad vectors.
authors.affiliation: Division of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow G11 6NT, United Kingdom.
authors.forename: Laura
authors.initials: L
authors.lastname: Denby
authors.forename: Lorraine M
authors.initials: LM
authors.lastname: Work
authors.forename: Delyth
authors.initials: D
authors.lastname: Graham
authors.forename: Catherine
authors.initials: C
authors.lastname: Hsu
authors.forename: Dan J
authors.initials: DJ
authors.lastname: von Seggern
authors.forename: Stuart A
authors.initials: SA
authors.lastname: Nicklin
authors.forename: Andrew H
authors.initials: AH
authors.lastname: Baker
mesh_terms: D000256:Adenoviridae / Q000235:genetics*; D000818:Animals; D015703:Antigens, CD / Q000096:biosynthesis; D001665:Binding Sites; D002213:Capsid; D002460:Cell Line; D002478:Cells, Cultured; D062727:Coxsackie and Adenovirus Receptor-Like Membrane Protein; D042783:Endothelial Cells / Q000166:cytology; D004730:Endothelium, Vascular / Q000378:metabolism; D018014:Gene Transfer Techniques; D005822:Genetic Vectors; D022781:Hepatocytes / Q000378:metabolism; D006801:Humans; D008099:Liver / Q000378:metabolism; D008297:Male; D051916:Membrane Cofactor Protein; D008562:Membrane Glycoproteins / Q000096:biosynthesis; D051379:Mice; D009154:Mutation; D051381:Rats; D011991:Receptors, Virus / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013997:Time Factors; D019076:Transgenes; D014771:Virion
chemical_list: D015703:Antigens, CD; C497857:CD46 protein, human; C568771:CLMP protein, human; C568772:CLMP protein, mouse; C497860:Cd46 protein, rat; C568773:Clmp protein, rat; D062727:Coxsackie and Adenovirus Receptor-Like Membrane Protein; C497859:Mcp protein, mouse; D051916:Membrane Cofactor Protein; D008562:Membrane Glycoproteins; D011991:Receptors, Virus