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Virology. 2010 Jan 5;396(1):94-105. doi: 10.1016/j.virol.2009.10.004. Epub 2009 Oct 31.

Loss of function of the influenza A virus NS1 protein promotes apoptosis but this is not due to a failure to activate phosphatidylinositol 3-kinase (PI3K).

Author information

1
Centre for Biomolecular Sciences, University of St. Andrews, St. Andrews, Fife, KY16 9ST, UK. dj10@st-andrews.ac.uk

Abstract

A panel of influenza A viruses encoding mutant NS1 proteins was created in which a number of NS1 functions, including interactions with dsRNA, PI3K, CPSF30 and PKR, were inhibited. Surprisingly, given previous reports that NS1 activates PI3K to prevent apoptosis, the mutant viruses rUd-Y89F and rUd-P164/7A that fail to activate PI3K did not induce any more apoptosis than wild-type virus in MRC-5 and A549 cells, even though these cells are highly sensitive to inducers of apoptosis. Induction of cell death by the apoptogenic rUd-184-8(P) virus could not be prevented by serum-mediated activation of PI3K/Akt. Neither infection of MRC-5 or A549 cells with wild-type virus nor constitutive expression of NS1 prevented cell death caused by apoptosis inducers, suggesting that NS1 is not directly anti-apoptotic. Our data suggest that the loss of a functionally intact NS1 protein promotes apoptosis, but this is not due to an inability to activate PI3K.

PMID:
19880155
DOI:
10.1016/j.virol.2009.10.004
[Indexed for MEDLINE]
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