title: A new hybrid system capable of efficient lentiviral vector production and stable gene transfer mediated by a single helper-dependent adenoviral vector.
abstract: To achieve efficient and sustained gene expression, we developed a new lentivirus/adenovirus hybrid vector (LA vector) that encodes sequences required for production of a human immunodeficiency virus-based lentiviral vector (i.e., a lentiviral vector, a gag/pol/rev expression cassette, a tetracycline-inducible envelope cassette, and the tetracycline-inducible transcriptional activator cassette) in a single helper-dependent adenovirus vector backbone. Via either transfection or infection, human cell lines transduced with the LA vector produced a lentiviral vector in a doxycycline-dependent manner at titers up to 10(5) to 10(6) green fluorescent protein transducing units per ml, which are comparable to the titers obtained by conventional multiple plasmid transfection methods. Efficient spread and persistent expression of the transgene were observed in cells maintained in long-term culture that had been infected with the LA vector. Furthermore, when cocultured with adherent cells infected with the LA vector, the human T-cell leukemia cell line was successfully transduced with a marker gene. This LA vector possesses the advantages of efficient gene transfer from an adenoviral vector and stable integration from a lentiviral vector; therefore, it might have potential for a variety of gene therapy applications.
authors.affiliation: Department of Microbiology, Immunology and Molecular Genetics, UCLA School of Medicine, Los Angeles, Los Angeles, California 90095-1747, USA.
authors.forename: Shuji
authors.initials: S
authors.lastname: Kubo
authors.forename: Kohnosuke
authors.initials: K
authors.lastname: Mitani
mesh_terms: D000260:Adenoviruses, Human / Q000235:genetics* / Q000472:pathogenicity; D000818:Animals; D002460:Cell Line; D018014:Gene Transfer Techniques; D005822:Genetic Vectors; D049452:Green Fluorescent Proteins; D006367:HeLa Cells; D006378:Helper Viruses / Q000235:genetics*; D006801:Humans; D016086:Lentivirus / Q000235:genetics* / Q000472:pathogenicity; D008164:Luminescent Proteins / Q000235:genetics / Q000378:metabolism; D014161:Transduction, Genetic; D014162:Transfection; D014764:Viral Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D008164:Luminescent Proteins; D014764:Viral Proteins; D049452:Green Fluorescent Proteins