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2012 ; 7
(11
): e49856
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Influenza A(H1N1)pdm09 virus suppresses RIG-I initiated innate antiviral
responses in the human lung
#MMPMID23185463
Wu W
; Zhang W
; Booth JL
; Metcalf JP
PLoS One
2012[]; 7
(11
): e49856
PMID23185463
show ga
Influenza infection is a major cause of morbidity and mortality. Retinoic
acid-inducible gene I (RIG-I) is believed to play an important role in the
recognition of, and response to, influenza virus and other RNA viruses. Our study
focuses on the hypothesis that pandemic H1N1/09 influenza virus alters the
influenza-induced proinflammatory response and suppresses host antiviral
activity. We first compared the innate response to a clinical isolate of
influenza A(H1N1)pdm09 virus, OK/09, a clinical isolate of seasonal H3N2 virus,
OK/06, and to a laboratory adapted seasonal H1N1 virus, PR8, using a unique human
lung organ culture model. Exposure of human lung tissue to either pandemic or
seasonal influenza virus resulted in infection and replication in alveolar
epithelial cells. Pandemic virus induces a diminished RIG-I mRNA and antiviral
cytokine response than seasonal virus in human lung. The suppression of antiviral
response and RIG-I mRNA expression was confirmed at the protein level by ELISA
and western blot. We performed a time course of RIG-I and interferon-? (IFN-?)
mRNA induction by the two viruses. RIG-I and IFN-? induction by OK/09 was of
lower amplitude and shorter duration than that caused by PR8. In contrast, the
pandemic virus OK/09 caused similar induction of proinflammatory cytokines, IL-8
and IL-6, at both the transcriptional and translational level as PR8 in human
lung. Differential antiviral responses did not appear to be due to a difference
in cellular infectivity as immunohistochemistry showed that both viruses infected
alveolar macrophages and epithelial cells. These findings show that influenza
A(H1N1)pdm09 virus suppresses anti-viral immune responses in infected human lung
through inhibition of viral-mediated induction of the pattern recognition
receptor, RIG-I, though proinflammatory cytokine induction was unaltered. This
immunosuppression of the host antiviral response by pandemic virus may have
contributed to the more serious lung infections that occurred in the H1N1
pandemic of 2009.