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Immunopathologic aspects of woodchuck hepatitis
The American Journal of Pathology
|April 1, 1984
Summary
Woodchuck hepatitis virus (WHV) infection in Marmota monax shows continuous viral replication in chronic carriers. Two distinct liver patterns, portal and periportal hepatitis, were observed, with progression linked to immune response.
Area of Science:
- Hepatology
- Virology
- Immunology
Background:
- Woodchuck hepatitis virus (WHV) is an important model for human hepatitis B virus (HBV) infection.
- Understanding the natural history of WHV infection is crucial for developing therapeutic strategies.
Purpose of the Study:
- To investigate the natural history of WHV infection in a colony of woodchucks (Marmota monax).
- To correlate serologic markers with liver biopsy findings and immunofluorescence analysis of viral antigens.
Main Methods:
- Serologic assessment for WHV markers in 38 woodchucks.
- Light-microscopic examination of 61 liver biopsies.
- Immunofluorescence analysis for WHV nucleocapsid antigen (WHcAg) and surface antigen (WHsAg).
Main Results:
- Twenty-four chronic WHsAg carriers exhibited continuous WHV replication.
- Two immunomorphologic patterns were identified: portal hepatitis (cytoplasmic WHcAg, membrane WHsAg) and periportal hepatitis (nuclear WHcAg, intracytoplasmic WHsAg).
- Progression from portal to periportal hepatitis in 7 animals was associated with partial immune recovery insufficient to halt replication. WHsAg and immunoglobulin deposits were found in kidneys and spleens of animals with severe hepatitis.
Conclusions:
- Chronic WHV carriers demonstrate persistent viral replication with distinct liver pathology patterns.
- Immune responses can influence WHV antigen localization and disease progression.
- WHV infection can lead to systemic antigen and immunoglobulin deposition, particularly in severe cases.