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Related Experiment Video

Updated: Jan 31, 2026

Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
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Complement Regulation and Immune Evasion by Hepatitis C Virus.

Young-Chan Kwon1,2,3, Ranjit Ray4,5

  • 1Department of Internal Medicine, Saint Louis University, St. Louis, MO, USA.

Methods in Molecular Biology (Clifton, N.J.)
|December 30, 2018
PubMed
Summary

Hepatitis C virus (HCV) infection specifically reduces complement C9 mRNA in the liver, impacting immune responses. This impairment in complement synthesis is not linked to liver damage severity in HCV patients.

Keywords:
CascadeComplementConvertaseHepatitis C virusLiver diseaseLysisOpsoninsiRNA

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Area of Science:

  • Immunology
  • Hepatology
  • Virology

Background:

  • The complement system links innate and adaptive immunity.
  • Hepatocytes in the liver are the primary sites for complement component synthesis.
  • Complement deficiencies can increase susceptibility to infections.

Purpose of the Study:

  • To investigate the effect of Hepatitis C Virus (HCV) on complement synthesis in hepatocytes.
  • To determine if liver damage correlates with altered complement levels in HCV patients.
  • To identify specific complement components affected by chronic HCV infection.

Main Methods:

  • Analysis of complement component synthesis (C4, C3) in relation to HCV infection.
  • Correlation analysis between complement levels and markers of liver fibrosis, rheumatoid factor, albumin, and alkaline phosphatase.
  • Quantitative analysis of complement component mRNA levels (C9, C6, C8, Factor B, MASP1, MBL) in HCV-infected liver biopsies.

Main Results:

  • HCV infection was found to impair the synthesis of complement components C4 and C3.
  • Changes in complement component levels in HCV patients did not correlate with liver fibrosis or other clinical markers.
  • A significant reduction in C9 mRNA was observed in HCV-infected liver tissue, while other complement genes remained largely unaffected, suggesting a virus-specific effect.

Conclusions:

  • HCV specifically interferes with complement component synthesis, particularly C9, at the mRNA level in hepatocytes.
  • The observed complement dysregulation is likely a direct effect of HCV, not solely a consequence of liver disease.
  • Impaired complement function due to HCV may affect immune responses and increase infection risk.