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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 Front+Immunol
2016 ; 7
(ä): 335
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English Wikipedia
Extracellular Vesicles Including Exosomes Regulate Innate Immune Responses to
Hepatitis B Virus Infection
#MMPMID27630638
Kouwaki T
; Fukushima Y
; Daito T
; Sanada T
; Yamamoto N
; Mifsud EJ
; Leong CR
; Tsukiyama-Kohara K
; Kohara M
; Matsumoto M
; Seya T
; Oshiumi H
Front Immunol
2016[]; 7
(ä): 335
PMID27630638
show ga
The innate immune system is essential for controlling viral infection. Hepatitis
B virus (HBV) persistently infects human hepatocytes and causes hepatocellular
carcinoma. However, the innate immune response to HBV infection in vivo remains
unclear. Using a tree shrew animal model, we showed that HBV infection induced
hepatic interferon (IFN)-? expression during early infection. Our in vitro study
demonstrated that hepatic NK cells produced IFN-? in response to HBV only in the
presence of hepatic F4/80(+) cells. Moreover, extracellular vesicles (EVs)
released from HBV-infected hepatocytes contained viral nucleic acids and induced
NKG2D ligand expression in macrophages by stimulating MyD88, TICAM-1, and
MAVS-dependent pathways. In addition, depletion of exosomes from EVs markedly
reduced NKG2D ligand expression, suggesting the importance of exosomes for NK
cell activation. In contrast, infection of hepatocytes with HBV increased
immunoregulatory microRNA levels in EVs and exosomes, which were transferred to
macrophages, thereby suppressing IL-12p35 mRNA expression in macrophages to
counteract the host innate immune response. IFN-? increased the hepatic
expression of DDX60 and augmented the DDX60-dependent degradation of cytoplasmic
HBV RNA. Our results elucidated the crucial role of exosomes in antiviral innate
immune response against HBV. ACCESSION NUMBER: Accession number of RNA-seq data
is DRA004164 (DRA in DDBJ).