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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 PLoS+One
2016 ; 11
(8
): e0161793
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Mumps Virus Induces Protein-Kinase-R-Dependent Stress Granules, Partly
Suppressing Type III Interferon Production
#MMPMID27560627
Hashimoto S
; Yamamoto S
; Ogasawara N
; Sato T
; Yamamoto K
; Katoh H
; Kubota T
; Shiraishi T
; Kojima T
; Himi T
; Tsutsumi H
; Yokota S
PLoS One
2016[]; 11
(8
): e0161793
PMID27560627
show ga
Stress granules (SGs) are cytoplasmic granular aggregations that are induced by
cellular stress, including viral infection. SGs have opposing antiviral and
proviral roles, which depend on virus species. The exact function of SGs during
viral infection is not fully understood. Here, we showed that mumps virus (MuV)
induced SGs depending on activation of protein kinase R (PKR). MuV infection
strongly induced interferon (IFN)-?1, 2 and 3, and IFN-? through activation of
IFN regulatory factor 3 (IRF3) via retinoic acid inducible gene-I (RIG-I) and the
mitochondrial antiviral signaling (MAVS) pathway. MuV-induced IFNs were strongly
upregulated in PKR-knockdown cells. MuV-induced SG formation was suppressed by
knockdown of PKR and SG marker proteins, Ras-GTPase-activating protein
SH3-domain-binding protein 1 and T-cell-restricted intracellular antigen-1, and
significantly increased the levels of MuV-induced IFN-?1. However, viral titer
was not altered by suppression of SG formation. PKR was required for induction of
SGs by MuV infection and regulated type III IFN (IFN-?1) mRNA stability.
MuV-induced SGs partly suppressed type III IFN production by MuV; however, the
limited suppression was not sufficient to inhibit MuV replication in cell
culture. Our results provide insight into the relationship between SGs and IFN
production induced by MuV infection.