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Updated: Aug 8, 2026
Detection of Viral RNA by Fluorescence in situ Hybridization (FISH)
Published on: May 5, 2012
Localisation of hepatitis C virus proteins in infected liver tissue by immunofluorescence
K Blight1, R Lesniewski, J LaBrooy
1Department of Microbiology and Immunology, University of Adelaide, Australia.
Insights
Hepatitis C virus (HCV) antigens were detected in liver cells of infected patients. This suggests HCV might infect liver and lymphatic tissues, impacting disease development.
Area of Science:
- Virology
- Immunology
- Hepatology
Background:
- Hepatitis C virus (HCV) infection is a significant global health concern.
- Understanding HCV antigen expression is crucial for elucidating viral pathogenesis.
Purpose of the Study:
- To investigate the expression and localization of various Hepatitis C virus antigens within liver tissue.
- To determine if HCV antigens are present in hepatocytes and inflammatory cells.
Main Methods:
- Immunohistochemical staining of frozen liver sections from HCV-positive patients.
- Indirect immunofluorescence using polyclonal antibodies against HCV capsid, E2/NS1, NS3, NS4, and NS5 antigens.
- Specificity confirmed by pre-adsorption of antisera and testing in non-HCV infected individuals.
Main Results:
- HCV E2 and NS3 antigens were localized in scattered hepatocytes and inflammatory cells.
- Weaker signals for NS4 and NS5 antigens were observed; no capsid antigen signal was detected.
- No staining was observed in liver tissue from individuals negative for HCV serological markers, including those with Hepatitis B or Delta virus infections.
Conclusions:
- Hepatitis C virus antigens are expressed in liver tissue, particularly E2 and NS3.
- The findings suggest that HCV may exhibit lymphotropic properties in addition to being hepatotropic.
- This dual tropism could play a role in the pathogenesis of Hepatitis C virus infection.
Abstract:
Hepatitis C virus (HCV) antigen expression was examined by immunohistochemical staining in liver tissue taken at biopsy from 8 anti-HCV positive patients. Frozen liver sections were stained by indirect immunofluorescence for capsid, E2/NS1, NS3, NS4 and NS5 using polyclonal antibodies raised to synthetic peptides from these regions. The antigens E2 and NS3 were localised in scattered hepatocytes and also in cells within and around areas of inflammation. A weaker signal was observed for NS4 and NS5 and no signal was seen for capsid antigen. No staining was seen in liver tissue from 9 individuals, including 3 hepatitis B virus-positive and 2 hepatitis delta virus/positive patients, who were negative for serological markers of HCV. The specificity of the staining reaction was also confirmed by the lack of staining in HCV-positive liver samples, after the antisera was pre-adsorbed against the specific peptide. Collectively, the data suggests that HCV may not only be hepatotropic but also lymphotropic, and this may be an important factor in the pathogenesis of HCV infection.
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