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Journal of Virology, February 2002, p. 1071-1076, Vol. 76, No. 3
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.76.3.1071-1076.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
Tumor Necrosis Factor Alpha Exerts Powerful Anti-Influenza Virus Effects in Lung Epithelial Cells
Sang Heui Seo and Robert G. Webster*
Department of Virology and Molecular Biology, St. Jude Childrens Research Hospital, Memphis, Tennessee 38105-2794
Received 30 August 2001/
Accepted 23 October 2001
Previous studies have associated influenza virus-induced expression of inflammatory cytokines, including tumor necrosis factor alpha (TNF-
), with influenza pathogenesis in the human respiratory tract and have suggested that alpha and beta interferons are the first cytokines recruited to counteract such infection. However, we report here that TNF-
has powerful anti-influenza virus activity. When infected with influenza virus, cultured porcine lung epithelial cells expressed TNF-
in a dose-dependent manner. Expression of TNF-
was induced only by replicating virus. TNF-
showed strong antiviral activity against avian, swine, and human influenza viruses, and the antiviral effect of TNF-
was greater than that of gamma or alpha interferon. These findings suggest that TNF-
serves as the first line of defense against influenza virus infection in the natural host.
* Corresponding author. Mailing address: Department of Virology and Molecular Biology, St. Jude Childrens Research Hospital, 332 N. Lauderdale St., Memphis, TN 38105-2794. Phone: (901) 495-3400. Fax: (901) 523-2622. E-mail:
robert.webster{at}stjude.org.
Journal of Virology, February 2002, p. 1071-1076, Vol. 76, No. 3
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.76.3.1071-1076.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
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