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Journal of Virology, January 2000, p. 547-551, Vol. 74, No. 1
0022-538X/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Plasmid-Driven Formation of Influenza Virus-Like Particles

Gabriele Neumann,1 Tokiko Watanabe,1,2 and Yoshihiro Kawaoka1,*

Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin---Madison, Madison, Wisconsin 53706,1 and Laboratory of Microbiology, Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan2

Received 24 June 1999/Accepted 16 September 1999

We established a plasmid-based system for generating infectious influenza virus-like particles entirely from cloned cDNAs. Human embryonic kidney cells (293T) were transfected with plasmids encoding the influenza A virus structural proteins and with a plasmid encoding an influenza virus-like viral RNA (vRNA) which contained an antisense copy of the cDNA for green fluorescence protein (GFP) flanked by an RNA polymerase I promoter and terminator. Intracellular transcription of the latter construct by RNA polymerase I generated GFP vRNA that was packaged into influenza virus-like particles. This system, which produced more than 104 infectious particles per ml of supernatant, would be useful in studies of influenza virus replication and particle formation. It might also benefit efforts in vaccine production and in the development of improved gene therapy vectors.

* Corresponding author. Mailing address: Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin---Madison, 2015 Linden Dr. West, Madison, WI 53706. Phone: (608) 265-4925. Fax: (608) 265-5622. E-mail: kawaokay{at}svm.vetmed.wisc.edu.

Journal of Virology, January 2000, p. 547-551, Vol. 74, No. 1
0022-538X/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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Copyright © 2000 by the American Society for Microbiology. All rights reserved.