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Hepatitis B virus antigens impair NK cell function.

Yinli Yang1, Qiuju Han2, Cai Zhang2

  • 1State Key Lab of Microbial Technology, National Glycoengineering Research Center, Shandong University, China; Institute of Immunopharmaceutical Sciences, School of Pharmaceutical Sciences, Shandong University, China.

International Immunopharmacology
|June 25, 2016
PubMed
Summary

Hepatitis B virus (HBV) antigens HBsAg and HBeAg directly impair natural killer (NK) cell function, hindering the immune response and contributing to chronic HBV infection. This viral evasion strategy targets early antiviral defenses, promoting viral persistence.

Keywords:
HBeAgHBsAgNF-κBNatural killer cellSTAT1p38 MAPK

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Area of Science:

  • Immunology
  • Virology
  • Hepatology

Background:

  • Chronic hepatitis B virus (CHB) infection is linked to inadequate host immune responses.
  • Natural killer (NK) cells are crucial for controlling viral infections but are functionally impaired in CHB patients, potentially leading to viral persistence.

Purpose of the Study:

  • To investigate the direct impact of hepatitis B virus (HBV) antigens on NK cell function.
  • To elucidate the mechanisms by which HBV antigens inhibit NK cell-mediated antiviral responses.

Main Methods:

  • Utilized the human NK cell line NK-92 to assess the effects of HBsAg and HBeAg.
  • Analyzed NK cell activation, cytokine production, and cytotoxic granule release.
  • Investigated the modulation of activating and inhibitory receptors on NK cells.
  • Examined the involvement of STAT1, NF-κB, and p38 MAPK signaling pathways.

Main Results:

  • HBV antigens HBsAg and HBeAg directly inhibited NK cell activation, cytokine production, and cytotoxic granule release.
  • These inhibitory effects were associated with the downregulation of activating receptors and upregulation of inhibitory receptors on NK cells.
  • The underlying mechanisms involved the suppression of STAT1, NF-κB, and p38 MAPK signaling pathways.

Conclusions:

  • HBV antigens employ a strategy to inhibit NK cell function, thereby evading early innate immune responses.
  • This antigen-mediated NK cell suppression contributes to the establishment and persistence of chronic HBV infection.
  • The study highlights a critical interaction between HBV and innate immunity, specifically impacting NK cell-mediated antiviral activity.