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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Immunity
2011 ; 34
(6
): 854-65
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NLRX1 protein attenuates inflammatory responses to infection by interfering with
the RIG-I-MAVS and TRAF6-NF-?B signaling pathways
#MMPMID21703540
Allen IC
; Moore CB
; Schneider M
; Lei Y
; Davis BK
; Scull MA
; Gris D
; Roney KE
; Zimmermann AG
; Bowzard JB
; Ranjan P
; Monroe KM
; Pickles RJ
; Sambhara S
; Ting JP
Immunity
2011[Jun]; 34
(6
): 854-65
PMID21703540
show ga
The nucleotide-binding domain and leucine-rich-repeat-containing (NLR) proteins
regulate innate immunity. Although the positive regulatory impact of NLRs is
clear, their inhibitory roles are not well defined. We showed that Nlrx1(-/-)
mice exhibited increased expression of antiviral signaling molecules IFN-?,
STAT2, OAS1, and IL-6 after influenza virus infection. Consistent with increased
inflammation, Nlrx1(-/-) mice exhibited marked morbidity and histopathology.
Infection of these mice with an influenza strain that carries a mutated NS-1
protein, which normally prevents IFN induction by interaction with RNA and the
intracellular RNA sensor RIG-I, further exacerbated IL-6 and type I IFN
signaling. NLRX1 also weakened cytokine responses to the 2009 H1N1 pandemic
influenza virus in human cells. Mechanistically, Nlrx1 deletion led to
constitutive interaction of MAVS and RIG-I. Additionally, an inhibitory function
is identified for NLRX1 during LPS activation of macrophages where the MAVS-RIG-I
pathway was not involved. NLRX1 interacts with TRAF6 and inhibits NF-?B
activation. Thus, NLRX1 functions as a checkpoint of overzealous inflammation.
|*Signal Transduction
[MESH]
|Adaptor Proteins, Signal Transducing/immunology/metabolism
[MESH]
|Animals
[MESH]
|Cells, Cultured
[MESH]
|Influenza A Virus, H1N1 Subtype/*immunology
[MESH]