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Journal of Virology, October 2002, p. 10455-10464, Vol. 76, No. 20
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.20.10455-10464.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Influenza Virus Can Enter and Infect Cells in the Absence of Clathrin-Mediated Endocytosis

Sara B. Sieczkarski and Gary R. Whittaker*

Department of Microbiology and Immunology, Cornell University, Ithaca, New York

Received 15 April 2002/ Accepted 2 July 2002

Influenza virus has been described to enter host cells via clathrin-mediated endocytosis. However, it has also been suggested that other endocytic routes may provide additional entry pathways. Here we show that influenza virus may enter and infect HeLa cells that are unable to take up ligands by clathrin-mediated endocytosis. By overexpressing a dominant-negative form of the Eps15 protein to inhibit clathrin-mediated endocytosis, we demonstrate that while transferrin uptake and Semliki Forest virus infection were prevented, influenza virus could enter and infect cells expressing Eps15{Delta}95/295. This finding is supported by the successful infection of cells with influenza virus in the presence of chemical treatments that block endocytosis, namely, chlorpromazine and potassium depletion. We show also that influenza virus may infect cells incapable of uptake by caveolae. Treatment with the inhibitors nystatin, methyl-ß-cyclodextrin, and genistein, as well as transfection of cells with dominant-negative caveolin-1, had no effect on influenza virus infection. By combining inhibitory methods to block both clathrin-mediated endocytosis and uptake by caveolae in the same cell, we demonstrate that influenza virus may infect cells by an additional non-clathrin-dependent, non-caveola-dependent endocytic pathway. We believe this to be the first conclusive analysis of virus entry via such a non-clathrin-dependent pathway, in addition to the traditional clathrin-dependent route.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Veterinary Medical Center, Cornell University, Ithaca, NY 14853. Phone: (607) 253-4019. Fax: (607) 253-3384. E-mail: grw7{at}cornell.edu.

Journal of Virology, October 2002, p. 10455-10464, Vol. 76, No. 20
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.20.10455-10464.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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