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Transmissible mink encephalopathy: studies on the peripheral lymphocyte
Abstract:
Circulating lymphocytes from mink with transmissible mink encephalopathy were studied for the presence of virus particles and for infectivity. Electron microscope examination of phytohemagglutinin-stimulated lymphocyte cultures revealed no evidence of virus-like particles. Circulating lymphocytes were also found to be noninfectious when the transmissible agent could be demonstrated in intact lymphoid organs in infected mink. A lymphopenia was detected in affected mink during the late clinical stage of disease, but this was most likely a secondary effect due to a terminal stress factor.
Insights
Transmissible mink encephalopathy (TME) agent was not found in circulating lymphocytes of affected mink. Lymphocytes from TME-infected mink were noninfectious, suggesting TME does not spread via this route.
Area of Science:
- Veterinary Virology
- Prion Disease Research
- Immunology
Background:
- Transmissible mink encephalopathy (TME) is a fatal prion disease affecting mink.
- The cellular tropism and transmission routes of the TME agent remain incompletely understood.
- Investigating the role of circulating lymphocytes in TME pathogenesis is crucial.
Purpose of the Study:
- To determine the presence of TME virus particles in circulating lymphocytes.
- To assess the infectivity of circulating lymphocytes from TME-affected mink.
- To investigate the potential role of lymphocytes in TME transmission.
Main Methods:
- Electron microscopy of phytohemagglutinin-stimulated lymphocyte cultures.
- Infectivity assays using lymphocytes from TME-affected mink.
- Comparison with infectivity in lymphoid organs.
Main Results:
- No virus-like particles were detected in circulating lymphocyte cultures via electron microscopy.
- Circulating lymphocytes from TME-affected mink were noninfectious.
- The TME agent was infectious in intact lymphoid organs of affected mink.
- A late-stage lymphopenia was observed, likely a secondary stress response.
Conclusions:
- Circulating lymphocytes are not a significant reservoir or transmission route for the TME agent.
- The TME agent is present and infectious within lymphoid organs.
- Lymphopenia in late-stage TME is likely a consequence of terminal illness rather than a direct disease mechanism.