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Decreased frequency and function of circulating plasmocytoid dendritic cells (pDC) in hepatitis B virus infected

Xue-Zhang Duan1, Min Wang, Han-Wei Li

  • 1Research Centre of Biological Therapy, Beijing Institute of Infectious Diseases, Beijing 302 Hospital, Beijing, People's Republic of China.

Journal of Clinical Immunology
|December 29, 2004
PubMed

Insights

Chronic hepatitis B virus infection (CHB) reduces critical antiviral plasmacytoid dendritic cells (pDCs) and IFN-alpha secretion. Antiviral therapy can restore pDC numbers, suggesting potential for immune recovery in CHB patients.

Area of Science:

  • Immunology
  • Virology
  • Hepatology

Background:

  • Plasmacytoid dendritic cells (pDCs) are crucial for antiviral innate immunity.
  • Hepatitis B virus (HBV) infection can impair immune responses.
  • Understanding pDC function in chronic HBV (CHB) is vital for immune modulation.

Purpose of the Study:

  • To analyze the frequency and function of circulating pDCs in CHB patients.
  • To investigate the impact of HBV infection and liver cirrhosis (LC) on pDC numbers and IFN-alpha secretion.
  • To evaluate the effect of antiviral therapy on pDC populations in CHB.

Main Methods:

  • Flow cytometric analysis of circulating pDCs, NK cells, and CD8+ T cells.
  • ELISA assay for IFN-alpha secretion from peripheral blood mononuclear cells (PBMCs).
  • Analysis of 25 healthy subjects and 116 CHB patients at various disease stages.

Main Results:

  • CHB and LC patients exhibited significantly lower numbers of circulating pDCs.
  • PBMCs from CHB patients showed significantly reduced IFN-alpha secretion.
  • A decrease in circulating NK cells and CD8+ T cells was observed in CHB patients.
  • Lamivudine therapy restored pDC numbers and HBV replication control.
  • pDC decrease in LC patients was linked to nosocomial infections.

Conclusions:

  • CHB patients may experience quantitative and qualitative impairments of pDCs and NK cells.
  • These immune deficits are associated with persistent HBV infection and nosocomial infections in LC patients.
  • Immune restoration is possible with antiviral therapy, indicating CHB patients are not entirely immunocompromised.

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