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Hepatitis C virus-infected hepatocytes extrinsically modulate dendritic cell maturation to activate T cells and

Takashi Ebihara1, Masashi Shingai, Misako Matsumoto

  • 1Department of Microbiology and Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.

Hepatology (Baltimore, Md.)
|June 10, 2008
PubMed

Insights

Hepatitis C virus (HCV) does not directly activate immune cells. Instead, dendritic cells mature by engulfing infected apoptotic cells, triggering antiviral responses via Toll-like receptor 3 (TLR3) signaling.

Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • Dendritic cell (DC) maturation is crucial for antiviral immunity and viral clearance.
  • Hepatitis C virus (HCV) frequently establishes persistent infections.
  • The JFH1 strain of HCV replicates efficiently in cell culture.

Purpose of the Study:

  • To investigate the immune response of human monocyte-derived dendritic cells (MoDCs) to the JFH1 strain of HCV.
  • To elucidate the mechanisms by which MoDCs interact with HCV and initiate antiviral responses.

Main Methods:

  • MoDCs were exposed to the JFH1 strain of HCV.
  • MoDCs were co-cultured with HCV-infected apoptotic Huh7.5.1 hepatic cells.
  • Expression of maturation markers, cytokine production, T cell activation, and NK cell cytotoxicity were assessed.
  • Lipid raft-dependent phagocytosis and Toll-like receptor 3 (TLR3) signaling were investigated.

Main Results:

  • HCV JFH1 did not directly replicate or produce antigens in MoDCs.
  • Direct exposure to HCV JFH1 did not affect MoDC maturation markers, cytokine production, or immune cell activation.
  • MoDCs matured upon phagocytosing vesicles from HCV-infected apoptotic cells, containing double-stranded RNA (dsRNA).
  • This maturation involved increased CD86 expression, IL-6 and IFN-beta production, and enhanced NK cell and CD4+ T cell activation.
  • Lipid raft-dependent phagocytosis of dsRNA-containing vesicles and TLR3 signaling were essential for MoDC maturation and antiviral response.

Conclusions:

  • The JFH1 strain of HCV does not directly stimulate MoDCs to activate T and NK cells.
  • Phagocytosis of HCV-infected apoptotic cells by MoDCs is a critical pathway for maturation.
  • TLR3 signaling in MoDCs, triggered by dsRNA within phagocytosed vesicles, plays a vital role in initiating antiviral immunity against HCV.
Abstract

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