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Immunolocalization of alpha interferon in liver disease
C G Sutherland1, A M al-Badri, A G Howatson
1Department of Pathology, Royal Infirmary, Glasgow, Scotland.
Insights
Alpha interferon (a-IFN) is present in Kupffer cells in all liver diseases studied. Unexpectedly, hepatocytes also expressed a-IFN in non-viral liver conditions, challenging its use as a specific viral hepatitis marker.
Area of Science:
- Hepatology
- Immunology
- Virology
Background:
- Alpha interferon (a-IFN) is a cytokine primarily associated with antiviral responses.
- Its presence in liver tissue has been investigated as a potential marker for viral hepatitis.
Purpose of the Study:
- To investigate the expression patterns of alpha interferon (a-IFN) in various liver diseases.
- To determine if a-IFN in hepatocytes is a specific indicator of viral infection.
Main Methods:
- Indirect immunoperoxidase staining was employed to detect immunoreactive a-IFN.
- Seventy-eight liver biopsy specimens were analyzed, including viral hepatitis, chronic liver diseases, and normal controls.
Main Results:
- Kupffer cells showed positive a-IFN staining across all liver conditions.
- Hepatocytes were positive for a-IFN in acute viral hepatitis (perivenular, necrotic areas), chronic active hepatitis and primary biliary cirrhosis (periportal, piecemeal necrosis), and alcoholic hepatitis and bile duct obstruction (perivenular areas).
- Normal liver hepatocytes were negative for a-IFN.
Conclusions:
- Alpha interferon is not exclusively expressed in hepatocytes during viral hepatitis.
- The presence of a-IFN in liver cells is not a specific marker for viral infections, as it is also found in non-viral liver diseases.
Abstract:
The expression of immunoreactive alpha interferon was examined in 78 liver biopsy specimens using an indirect immunoperoxidase technique. Biopsy specimens included cases of acute viral hepatitis, chronic active hepatitis, primary biliary cirrhosis, alcoholic hepatitis, large bile duct obstruction and normal liver. Kupffer cells were positive for alpha interferon in all cases. Hepatocytes were negative for alpha interferon in normal liver but in acute viral hepatitis were positive in perivenular and necrotic areas. Hepatocytes were positive in periportal areas, associated with piecemeal necrosis, in chronic active hepatitis and primary biliary cirrhosis, and were positive in perivenular areas in alcoholic hepatitis and large bile duct obstruction. The unexpected finding of alpha interferon in hepatocytes in non-viral liver disease indicates that the presence of this substance in liver cells cannot be taken as a specific marker of viral infection.