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Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 PLoS+Pathog 2017 ; 13 (4): ä Nephropedia Template TP
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RIPK3 interacts with MAVS to regulate type I IFN-mediated immunity to Influenza A virus infection #MMPMID28410401
PLoS Pathog 2017[Apr]; 13 (4): ä PMID28410401show ga
The type I interferon pathway plays a critical role in both host defense and tolerance against viral infection and thus requires refined regulatory mechanisms. RIPK3-mediated necroptosis has been shown to be involved in anti-viral immunity. However, the exact role of RIPK3 in immunity to Influenza A Virus (IAV) is poorly understood. In line with others, we, herein, show that Ripk3-/- mice are highly susceptible to IAV infection, exhibiting elevated pulmonary viral load and heightened morbidity and mortality. Unexpectedly, this susceptibility was linked to an inability of RIKP3-deficient macrophages (M?) to produce type I IFN in the lungs of infected mice. In M? infected with IAV in vitro, we found that RIPK3 regulates type I IFN both transcriptionally, by interacting with MAVS and limiting RIPK1 interaction with MAVS, and post-transcriptionally, by activating protein kinase R (PKR)?a critical regulator of IFN-? mRNA stability. Collectively, our findings indicate a novel role for RIPK3 in regulating M?-mediated type I IFN anti-viral immunity, independent of its conventional role in necroptosis.