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Characterisation of the lymphoproliferation in rabbits experimentally affected with malignant catarrhal fever
Abstract:
Malignant catarrhal fever (MCF) in rabbits caused by the three Herpesviruses: alcelaphine herpesvirus-1 (AHV-1), ovine herpesvirus-2 (OHV-2) and hippotragine herpesvirus-1 (HipHV-1) induced hyperplasia of lymphoid tissues and accumulations of mononuclear lymphoid cells in non-lymphoid tissues. However, certain lymph nodes were affected preferentially. The lymphoid cells in non-lymphoid tissues were CD43+ T-cells which showed evidence of in situ multiplication. A more detailed phenotypic analysis of splenocytes and lymph node cells in AHV-1 infected rabbits suggested that the hyperplasia was probably due to the expansion of CD8+ T-cells. On the basis of these data and the observations of other authors, that no or very little viral expression can be detected in lesions of MCF affected animals, we propose that the pathogenesis of MCF results from a dysregulation of a secretory T-cell activator. The variable pathology induced by the three viruses may reflect a quantitative or qualitative differences in this proposed activator.
Insights
Malignant catarrhal fever (MCF) in rabbits, caused by specific herpesviruses, leads to lymphoid tissue hyperplasia. The study suggests MCF pathogenesis involves dysregulation of a T-cell activator, potentially explaining varied disease severity.
Area of Science:
- Veterinary Virology
- Immunology
- Pathogenesis Research
Background:
- Malignant catarrhal fever (MCF) in rabbits is associated with alcelaphine herpesvirus-1 (AHV-1), ovine herpesvirus-2 (OHV-2), and hippotragine herpesvirus-1 (HipHV-1).
- MCF induces lymphoid tissue hyperplasia and mononuclear cell accumulation in non-lymphoid tissues, with preferential lymph node involvement.
Purpose of the Study:
- To investigate the cellular mechanisms and pathogenesis of MCF in rabbits.
- To identify the specific immune cell populations involved in MCF lesions.
- To propose a model for MCF pathogenesis based on observed cellular changes and viral expression levels.
Main Methods:
- Histopathological examination of affected tissues in rabbits.
- Immunophenotypic analysis of lymphoid cells using markers like CD43 and CD8.
- Analysis of viral expression in lesions.
Main Results:
- Lymphoid cells in non-lymphoid tissues were identified as CD43+ T-cells with evidence of in situ proliferation.
- Phenotypic analysis in AHV-1 infected rabbits indicated CD8+ T-cell expansion contributing to hyperplasia.
- Minimal viral expression was detected in lesions of MCF-affected animals.
Conclusions:
- MCF pathogenesis likely results from a dysregulated secretory T-cell activator.
- The observed hyperplasia is potentially driven by the expansion of CD8+ T-cells.
- Variations in MCF pathology may stem from quantitative or qualitative differences in this proposed T-cell activator.