title: Development and characterization of an antisense-mediated prepackaging cell line for adeno-associated virus vector production.
abstract: One of the limitations of recombinant adeno-associated virus (rAAV) vector systems for gene therapy applications has been the difficulty in producing the vector in sufficient quantity for adequate evaluation. Since the AAV Rep proteins are cytotoxic, it is not easy to establish stable cell lines that express them constitutively. We describe a novel 293-derived prepackaging cell line which constitutively expresses the antisense rep/cap driven by a loxP-flanked CMV promoter. This cell line was converted into a packaging cell line expressing Rep/Cap for rAAV vector production through adenovirus-mediated introduction of a Cre recombinase gene. Without the introduction of the Cre recombinase gene, the cell line was shown to produce neither Rep nor Cap. rAAV vector was produced (1 x 10(9) genome copies/3.5-cm dish) 4 days after the transduction with Cre-expression adenovirus vector together with transfection of AAV vector plasmid. We further showed that the addition of Cap-expression adenovirus vector caused a 10-fold increase in the yield of rAAV vector. This system is also capable of producing rAAV as a transfection-free system by using a small amount of rAAV instead of vector plasmid.
authors.affiliation: Division of Genetic Therapeutics, Center for Molecular Medicine, Jichi Medical School, 3311-1 Yakushiji, Minami-kawachi, Kawachi, Tochigi 329-0498, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Okada
authors.forename: H
authors.initials: H
authors.lastname: Mizukami
authors.forename: M
authors.initials: M
authors.lastname: Urabe
authors.forename: T
authors.initials: T
authors.lastname: Nomoto
authors.forename: T
authors.initials: T
authors.lastname: Matsushita
authors.forename: Y
authors.initials: Y
authors.lastname: Hanazono
authors.forename: A
authors.initials: A
authors.lastname: Kume
authors.forename: K
authors.initials: K
authors.lastname: Tobita
authors.forename: K
authors.initials: K
authors.lastname: Ozawa
mesh_terms: D000256:Adenoviridae / Q000235:genetics; D000818:Animals; D016375:Antisense Elements (Genetics) / Q000235:genetics; D002460:Cell Line; D002875:Chromosomes; D003001:Cloning, Molecular; D004279:DNA, Viral / Q000235:genetics; D000229:Dependovirus / Q000235:genetics* / Q000378:metabolism; D015316:Genetic Therapy; D005822:Genetic Vectors; D019426:Integrases / Q000235:genetics / Q000502:physiology; D011995:Recombination, Genetic; D014764:Viral Proteins / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology; D019065:Virus Assembly
chemical_list: D016375:Antisense Elements (Genetics); D004279:DNA, Viral; D014764:Viral Proteins; C045073:Cre recombinase; D019426:Integrases