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    Hepatitis C virus (HCV) core protein-induced, monocyte-mediated mechanisms of reduced IFN-alpha and plasmacytoid dendritic cell loss in chronic HCV infection

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    Authors
    Dolganiuc, Angela
    Chang, Serena S.
    Kodys, Karen
    Mandrekar, Pranoti
    Bakis, Gennadiy
    Cormier, Maureen
    Szabo, Gyongyi
    Student Authors
    Serena S. Chang
    UMass Chan Affiliations
    Department of Medicine, Division of Gastroenterology
    Graduate School of Biomedical Sciences
    Document Type
    Journal Article
    Publication Date
    2006-11-04
    Keywords
    Adult; Apoptosis; Cell Death; Cells, Cultured; Cohort Studies; Dendritic Cells; Female; Hepacivirus; Hepatitis C, Chronic; Humans; Interferon-alpha; Leukocytes, Mononuclear; Leukopenia; Male; Middle Aged; Monocytes; Viral Core Proteins
    Immunology and Infectious Disease
    
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    Link to Full Text
    https://doi.org/10.4049/jimmunol.177.10.6758
    Abstract
    IFN-alpha production by plasmacytoid dendritic cells (PDCs) is critical in antiviral immunity. In the present study, we evaluated the IFN-alpha-producing capacity of PDCs of patients with chronic hepatitis C virus (HCV) infection in treatment-naive, sustained responder, and nonresponder patients. IFN-alpha production was tested in PBMCs or isolated PDCs after TLR9 stimulation. Treatment-naive patients with chronic HCV infection had reduced frequency of circulating PDCs due to increased apoptosis and showed diminished IFN-alpha production after stimulation with TLR9 ligands. These PDC defects correlated with the presence of HCV and were in contrast with normal PDC functions of sustained responders. HCV core protein, which was detectable in the plasma of infected patients, reduced TLR9-triggered IFN-alpha and increased TNF-alpha and IL-10 production in PBMCs but not in isolated PDCs, suggesting HCV core induced PDC defects. Indeed, addition of rTNF-alpha and IL-10 induced apoptosis and inhibited IFN-alpha production in PDCs. Neutralization of TNF-alpha and/or IL-10 prevented HCV core-induced inhibition of IFN-alpha production. We identified CD14+ monocytes as the source of TNF-alpha and IL-10 in the HCV core-induced inhibition of PDC IFN-alpha production. Anti-TLR2-, not anti-TLR4-, blocking Ab prevented the HCV core-induced inhibition of IFN-alpha production. In conclusion, our results suggest that HCV interferes with antiviral immunity through TLR2-mediated monocyte activation triggered by the HCV core protein to induce cytokines that in turn lead to PDC apoptosis and inhibit IFN-alpha production. These mechanisms are likely to contribute to HCV viral escape from immune responses.
    Source

    J Immunol. 2006 Nov 15;177(10):6758-68.

    DOI
    10.4049/jimmunol.177.10.6758
    Permanent Link to this Item
    http://hdl.handle.net/20.500.14038/33651
    PubMed ID
    17082589
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    Link to article in PubMed

    ae974a485f413a2113503eed53cd6c53
    10.4049/jimmunol.177.10.6758
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