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2013 ; 9
(4
): e1003256
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Type I IFN triggers RIG-I/TLR3/NLRP3-dependent inflammasome activation in
influenza A virus infected cells
#MMPMID23592984
Pothlichet J
; Meunier I
; Davis BK
; Ting JP
; Skamene E
; von Messling V
; Vidal SM
PLoS Pathog
2013[]; 9
(4
): e1003256
PMID23592984
show ga
Influenza A virus (IAV) triggers a contagious and potentially lethal respiratory
disease. A protective IL-1? response is mediated by innate receptors in
macrophages and lung epithelial cells. NLRP3 is crucial in macrophages; however,
which sensors elicit IL-1? secretion in lung epithelial cells remains
undetermined. Here, we describe for the first time the relative roles of the host
innate receptors RIG-I (DDX58), TLR3, and NLRP3 in the IL-1? response to IAV in
primary lung epithelial cells. To activate IL-1? secretion, these cells employ
partially redundant recognition mechanisms that differ from those described in
macrophages. RIG-I had the strongest effect through a
MAVS/TRIM25/Riplet-dependent type I IFN signaling pathway upstream of TLR3 and
NLRP3. Notably, RIG-I also activated the inflammasome through interaction with
caspase 1 and ASC in primary lung epithelial cells. Thus, NS1, an influenza
virulence factor that inhibits the RIG-I/type I IFN pathway, strongly modulated
the IL-1? response in lung epithelial cells and in ferrets. The NS1 protein
derived from a highly pathogenic strain resulted in increased interaction with
RIG-I and inhibited type I IFN and IL-1? responses compared to the least
pathogenic virus strains. These findings demonstrate that in IAV-infected lung
epithelial cells RIG-I activates the inflammasome both directly and through a
type I IFN positive feedback loop.
|*Influenza A Virus, H1N1 Subtype/metabolism
[MESH]
|Adaptor Proteins, Signal Transducing/metabolism
[MESH]