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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+Innate+Immun
2015 ; 7
(5
): 530-44
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Antiviral and Immunoregulatory Effects of Indoleamine-2,3-Dioxygenase in
Hepatitis C Virus Infection
#MMPMID25792183
Lepiller Q
; Soulier E
; Li Q
; Lambotin M
; Barths J
; Fuchs D
; Stoll-Keller F
; Liang TJ
; Barth H
J Innate Immun
2015[]; 7
(5
): 530-44
PMID25792183
show ga
In patients with hepatitis C virus (HCV) infection, enhanced activity of
indoleamine-2,3-dioxygenase 1 (IDO) has been reported. IDO - a
tryptophan-catabolizing enzyme - has been considered as both an innate defence
mechanism and an important regulator of the immune response. The molecular
mechanism of IDO induction in HCV infection and its role in the antiviral immune
response remain unknown. Using primary human hepatocytes, we show that HCV
infection stimulates IDO expression. IDO gene induction was transient and
coincided with the expression of types I and III interferons (IFNs) and
IFN-stimulated genes in HCV-infected hepatocytes. Overexpression of hepatic IDO
prior to HCV infection markedly impaired HCV replication in hepatocytes,
suggesting that IDO limits the spread of HCV within the liver. siRNA-mediated IDO
knock-down revealed that IDO functions as an IFN-mediated anti-HCV effector.
Hepatic IDO was most potently induced by IFN-x03B3;, and ongoing HCV replication
could significantly upregulate IDO expression. IRF1 (IFN-regulatory factor 1) and
STAT1 (signal transducer and activator of transcription 1) regulated hepatic IDO
expression. Hepatic IDO expression also had a significant inhibitory effect on
CD4+ T-cell proliferation. Our data suggest that hepatic IDO plays a dual role
during HCV infection by slowing down viral replication and also regulating host
immune responses.