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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 J+Immunol
2016 ; 196
(5
): 2283-92
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Hepatitis C Virus-Induced Myeloid-Derived Suppressor Cells Suppress NK Cell IFN-?
Production by Altering Cellular Metabolism via Arginase-1
#MMPMID26826241
Goh CC
; Roggerson KM
; Lee HC
; Golden-Mason L
; Rosen HR
; Hahn YS
J Immunol
2016[Mar]; 196
(5
): 2283-92
PMID26826241
show ga
The hepatitis C virus (HCV) infects ? 200 million people worldwide. The majority
of infected individuals develop persistent infection, resulting in chronic
inflammation and liver disease, including cirrhosis and hepatocellular carcinoma.
The ability of HCV to establish persistent infection is partly due to its ability
to evade the immune response through multiple mechanisms, including suppression
of NK cells. NK cells control HCV replication during the early phase of infection
and regulate the progression to chronic disease. In particular, IFN-? produced by
NK cells limits viral replication in hepatocytes and is important for the
initiation of adaptive immune responses. However, NK cell function is
significantly impaired in chronic HCV patients. The cellular and molecular
mechanisms responsible for impaired NK cell function in HCV infection are not
well defined. In this study, we analyzed the interaction of human NK cells with
CD33(+) PBMCs that were exposed to HCV. We found that NK cells cocultured with
HCV-conditioned CD33(+) PBMCs produced lower amounts of IFN-?, with no effect on
granzyme B production or cell viability. Importantly, this suppression of NK
cell-derived IFN-? production was mediated by CD33(+)CD11b(lo)HLA-DR(lo)
myeloid-derived suppressor cells (MDSCs) via an arginase-1-dependent inhibition
of mammalian target of rapamycin activation. Suppression of IFN-? production was
reversed by l-arginine supplementation, consistent with increased MDSC arginase-1
activity. These novel results identify the induction of MDSCs in HCV infection as
a potent immune evasion strategy that suppresses antiviral NK cell responses,
further indicating that blockade of MDSCs may be a potential therapeutic approach
to ameliorate chronic viral infections in the liver.