title: The AAV9 receptor and its modification to improve in vivo lung gene transfer in mice.
abstract: Vectors based on adeno-associated virus (AAV) serotype 9 are candidates for in vivo gene delivery to many organs, but the receptor(s) mediating these tropisms have yet to be defined. We evaluated AAV9 uptake by glycans with terminal sialic acids (SAs), a common mode of cellular entry for viruses. We found, however, that AAV9 binding increased when terminal SA was enzymatically removed, suggesting that galactose, which is the most commonly observed penultimate monosaccharide to SA, may mediate AAV9 transduction. This was confirmed in mutant CHO Pro-5 cells deficient in the enzymes involved in glycoprotein biogenesis, as well as lectin interference studies. Binding of AAV9 to glycans with terminal galactose was demonstrated via glycan binding assays. Co-instillation of AAV9 vector with neuraminidase into mouse lung resulted in exposure of terminal galactose on the apical surface of conducting airway epithelial cells, as shown by lectin binding and increased transduction of these cells, demonstrating the possible utility of this vector in lung-directed gene transfer. Increasing the abundance of the receptor on target cells and improving vector efficacy may improve delivery of AAV vectors to their therapeutic targets.
authors.affiliation: Gene Therapy Program, Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Christie L
authors.initials: CL
authors.lastname: Bell
authors.forename: Luk H
authors.initials: LH
authors.lastname: Vandenberghe
authors.forename: Peter
authors.initials: P
authors.lastname: Bell
authors.forename: Maria P
authors.initials: MP
authors.lastname: Limberis
authors.forename: Guang-Ping
authors.initials: GP
authors.lastname: Gao
authors.forename: Kim
authors.initials: K
authors.lastname: Van Vliet
authors.forename: Mavis
authors.initials: M
authors.lastname: Agbandje-McKenna
authors.forename: James M
authors.initials: JM
authors.lastname: Wilson
mesh_terms: D000818:Animals; D016466:CHO Cells / Q000187:drug effects / Q000378:metabolism / Q000821:virology; D002213:Capsid / Q000378:metabolism; D006224:Cricetinae; D003412:Cricetulus; D000229:Dependovirus / Q000145:classification / Q000235:genetics*; D016503:Drug Delivery Systems; D005690:Galactose / Q000378:metabolism*; D015316:Genetic Therapy / Q000379:methods*; D005822:Genetic Vectors / Q000493:pharmacokinetics*; D006031:Glycosylation; D008168:Lung / Q000378:metabolism* / Q000821:virology; D008297:Male; D008562:Membrane Glycoproteins / Q000187:drug effects / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D009439:Neuraminidase / Q000494:pharmacology; D011134:Polysaccharides / Q000378:metabolism*; D011485:Protein Binding; D011991:Receptors, Virus / Q000187:drug effects / Q000378:metabolism*; D014161:Transduction, Genetic / Q000379:methods
chemical_list: D008562:Membrane Glycoproteins; D011134:Polysaccharides; D011991:Receptors, Virus; D009439:Neuraminidase; D005690:Galactose