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Journal of Virology, January 2004, p. 999-1005, Vol. 78, No. 2
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.2.999-1005.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Production of Novel Ebola Virus-Like Particles from cDNAs: an Alternative to Ebola Virus Generation by Reverse Genetics

Shinji Watanabe,1 Tokiko Watanabe,2,3 Takeshi Noda,2,4 Ayato Takada,2,3 Heinz Feldmann,5 Luke D. Jasenosky,1 and Yoshihiro Kawaoka1,2,3*

Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin—Madison, Madison, Wisconsin 53706,1 Institute of Medical Science, University of Tokyo, Tokyo 108-8639,2 CREST, Japan Science and Technology Corporation, Saitama 332-0012,3 Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan,4 Special Pathogen Program, National Microbiology Laboratory, Canadian Science Centre for Human and Animal Health, Winnipeg, Manitoba R3E 3R2, Canada5

Received 14 July 2003/ Accepted 26 September 2003

We established a plasmid-based system for generating infectious Ebola virus-like particles (VLPs), which contain an Ebola virus-like minigenome consisting of a negative-sense copy of the green fluorescent protein gene. This system produced nearly 103 infectious particles per ml of supernatant, equivalent to the titer of Ebola virus generated by a reverse genetics system. Interestingly, infectious Ebola VLPs were generated, even without expression of VP24. Transmission and scanning electron microscopic analyses showed that the morphology of the Ebola VLPs was indistinguishable from that of authentic Ebola virus. Thus, this system allows us to study Ebola virus entry, replication, and assembly without biosafety level 4 containment. Furthermore, it may be useful in vaccine production against this highly pathogenic agent.

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

Journal of Virology, January 2004, p. 999-1005, Vol. 78, No. 2
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.2.999-1005.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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