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The pathogenesis of Aleutian disease of mink. 3. Immune complex arteritis
Abstract:
Mink chronically infected with Aleutian disease virus develop a severe necrotizing arteritis affecting muscular arteries. Acute, subacute and healing lesions may be found. Extracellular deposits of host immunoglobulin and complement and, after acid elution, viral antigen can be shown by immunofluorescence technics in areas of fibrinoid necrosis and between proliferating endothelial cells. No intracellular viral antigen was found, indicating that the virus probably does not replicate in vascular structures. The arteritis of Aleutian disease appears to be the result of immune complex deposits in vessel walls.
Insights
Aleutian disease virus causes severe arteritis in mink through immune complex deposition in blood vessels. This immune response, not viral replication, leads to necrotizing lesions in muscular arteries.
Area of Science:
- Veterinary Pathology
- Immunology
- Virology
Background:
- Aleutian disease virus (ADV) causes chronic infection in mink.
- Affected mink develop severe necrotizing arteritis, primarily in muscular arteries.
Purpose of the Study:
- To investigate the pathogenesis of arteritis in Aleutian disease.
- To determine the role of viral replication and immune response in vascular damage.
Main Methods:
- Immunofluorescence techniques were used to detect host immunoglobulin, complement, and viral antigen.
- Acid elution was performed to differentiate between extracellular and intracellular viral antigen.
Main Results:
- Extracellular deposits of immunoglobulin, complement, and viral antigen were found in areas of fibrinoid necrosis and between endothelial cells.
- No intracellular viral antigen was detected in vascular structures, suggesting limited viral replication within the vasculature.
Conclusions:
- The arteritis associated with Aleutian disease in mink is likely caused by the deposition of immune complexes in vessel walls.
- The findings indicate an immune-mediated mechanism rather than direct viral damage to vascular structures.