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Journal of Virology, September 1998, p. 7024-7031, Vol. 72, No. 9
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Packaging Cells Based on Inducible Gene Amplification for the Production of Adeno-Associated Virus Vectors

Naoki Inoue and David W. Russell*

Markey Molecular Medicine Center and Department of Medicine, University of Washington, Seattle, Washington 98195

Received 29 January 1998/Accepted 21 May 1998

Although vectors based on adeno-associated virus (AAV) offer several unique advantages, their usage has been hampered by the difficulties encountered in vector production. In this report, we describe a new AAV packaging system based on inducible amplification of integrated helper and vector constructs containing the simian virus 40 (SV40) replication origin. The packaging and producer cell lines developed express SV40 T antigen under the control of the reverse tetracycline transactivator system, which allows inducible amplification of chromosomal loci linked to the SV40 origin. Culturing these cells in the presence of doxycycline followed by adenovirus infection resulted in helper and vector gene amplification as well as higher vector titers. Clonal producer cell lines generated vector titers that were 10 times higher than those obtained by standard methods, with approximately 104 vector particles produced per cell. These stocks were free of detectable replication-competent virus. The lack of a transfection step combined with the reproducibility of stable producer lines makes this packaging method ideally suited for the large-scale production of vector stocks for human gene therapy.

* Corresponding author. Mailing address: Department of Medicine, Box 357720, University of Washington, Seattle, WA 98195. Phone: (206) 616-4562. Fax: (206) 616-8298. E-mail: drussell{at}u.washington.edu.

Journal of Virology, September 1998, p. 7024-7031, Vol. 72, No. 9
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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Copyright © 1998 by the American Society for Microbiology. All rights reserved.