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The pathogenesis of biliary atresia in Japan: immunohistochemical study of HBV-associated antigen
M Tanaka1, T Ishikawa, M Sakaguchi
1Department of Pathology, Jikei University School of Medicine, Tokyo, Japan.
Insights
Hepatitis B virus (HBV) antigens were detected in most infants with biliary atresia, suggesting HBV infection may contribute to this liver condition. This finding may link HBV, biliary atresia, and other infant liver diseases.
Area of Science:
- Hepatology
- Immunology
- Pediatric Gastroenterology
Background:
- Biliary atresia is a severe neonatal liver disease with unknown etiology.
- Hepatitis B virus (HBV) infection is a global health concern, particularly in infants.
Purpose of the Study:
- To investigate the presence and significance of HBV-associated antigens in Japanese infants diagnosed with biliary atresia.
- To explore the potential role of HBV infection in the pathogenesis of biliary atresia.
Main Methods:
- Immunohistochemical analysis of liver tissue samples from 16 infants with biliary atresia.
- Detection of Hepatitis B core (HBc) and Hepatitis B surface (HBs) antigens within liver cells and lymphocytes.
Main Results:
- HBV-associated antigens (HBc and/or HBs) were identified in 13 out of 16 infants (81.25%).
- Positive cells were primarily small hepatocytes in the lobule's periphery, with some lymphocytes nearby.
- HBc antigen was predominantly found in the cytoplasm of positive liver cells.
Conclusions:
- The findings suggest HBV infection may play a role in causing or accelerating biliary atresia through an immunological mechanism.
- Similar HBV antigen positivity in neonatal hepatitis and choledochal cysts suggests these conditions may share a common pathogenic pathway with biliary atresia.
- HBV infection is a potential contributing factor to biliary atresia in Japanese infants.
Abstract:
An immunohistochemical study of HBV-associated antigen in the liver of 16 Japanese infants with biliary atresia revealed positive findings in 13 of the cases for HBc and/or HBs antigens. The positive cells were mainly small liver cells distributed in the peripheral zone of the lobule, and a few lymphocytes were observed in contact with or around the positive liver cells for HBV-associated antigen. Again, HBc antigen was demonstrated almost exclusively in the cytoplasm of positive liver cells. As these findings suggest the possibility of destruction and drop-out of cells constituting the interlobular bile duct in the junctional area by an immunological mechanism, the probability of HBV infection being an important factor in causing and accelerating biliary atresia cannot be denied. Positive findings for HBV-associated antigen similar to those found in biliary atresia are also seen in neonatal hepatitis and choledochal cysts. These conditions are therefore presumed to belong to the same category.