NS1 proteins of avian influenza A viruses can act as antagonists of the human alpha/beta interferon response

A. Hayman, S. Comely, Angie Lackenby, L. C.S. Hartgroves, S. Goodbourn, J. W. McCauley, W. S. Barclay

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68 Citations (Scopus)

Abstract

Many viruses, including human influenza A virus, have developed strategies for counteracting the host type I interferon (IFN) response. We have explored whether avian influenza viruses were less capable of combating the type I IFN response in mammalian cells, as this might be a determinant of host range restriction. A panel of avian influenza viruses isolated between 1927 and 1997 was assembled. The selected viruses showed variation in their ability to activate the expression of a reporter gene under the control of the IFN-β promoter and in the levels of IFN induced in mammalian cells. Surprisingly, the avian NS1 proteins expressed alone or in the genetic background of a human influenza virus controlled IFN-β induction in a manner similar to the NS1 protein of human strains. There was no direct correlation between the IFN-β induction and replication of avian influenza viruses in human A549 cells. Nevertheless, human cells deficient in the type I IFN system showed enhanced replication of the avian viruses studied, implying that the human type I IFN response limits avian influenza viruses and can contribute to host range restriction.

Original languageEnglish
Pages (from-to)2318-2327
Number of pages10
JournalJournal of Virology
Volume81
Issue number5
DOIs
Publication statusPublished - Mar 2007

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