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Journal of Virology, May 2002, p. 5266-5270, Vol. 76, No. 10
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.10.5266-5270.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Association of the Caveola Vesicular System with Cellular Entry by Filoviruses

Cyril J. Empig1 and Mark A. Goldsmith1,2*

Gladstone Institute of Virology and Immunology,1 School of Medicine, University of California, San Francisco, San Francisco, California 94141-91002

Received 26 September 2001/ Accepted 12 February 2002

The filoviruses Ebola Zaire virus and Marburg virus are believed to infect target cells through endocytic vesicles, but the details of this pathway are unknown. We used a pseudotyping strategy to investigate the cell biology of filovirus entry. We observed that specific inhibitors of the caveola system, including cholesterol-sequestering drugs and phorbol esters, inhibited the entry of filovirus pseudotypes into human cells. We also measured slower cell entry kinetics for both filovirus pseudotypes than for pseudotypes of vesicular stomatitis virus (VSV), which has been recognized to exploit the clathrin-mediated entry pathway. Finally, visualization by immunofluorescence and confocal microscopy revealed that the filovirus pseudotypes colocalized with the caveola protein marker caveolin-1 but that VSV pseudotypes did not. Collectively, these results provide evidence suggesting that filoviruses use caveolae to gain entry into cells.

* Corresponding author. Mailing address: Gladstone Institute of Virology and Immunology, P.O. Box 419100, San Francisco, CA 94141-9100. Phone: (415) 695-3775. Fax: (415) 695-1364. E-mail: mgoldsmith{at}gladstone.ucsf.edu.

Journal of Virology, May 2002, p. 5266-5270, Vol. 76, No. 10
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.10.5266-5270.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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