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Follicular dendritic cells in scrapie pathogenesis
K L Brown1, K Stewart, D Ritchie
1Institute for Animal Health, Neuropathogenesis Unit, Edinburgh, UK.
Archives of Virology. Supplementum
|February 24, 2001
Summary
Follicular dendritic cells, not lymphocytes, are crucial for prion protein replication in scrapie pathogenesis. Targeting these cells may offer new treatments for transmissible spongiform encephalopathies.
Area of Science:
- Neuroscience
- Immunology
- Prion Biology
Background:
- Transmissible spongiform encephalopathies (TSEs) are fatal neurodegenerative diseases.
- The role of specific immune cells in prion pathogenesis remains incompletely understood.
- Prion protein (PrP) expression is critical for TSE development.
Purpose of the Study:
- To investigate the role of follicular dendritic cells (FDCs) and lymphocytes in scrapie pathogenesis.
- To determine the cell-specific requirement for prion protein (PrP) in TSE replication and neuroinvasion.
Main Methods:
- Generation of chimeric mice with differential prion protein (PrP) gene expression in bone marrow-derived cells versus FDCs.
- Utilizing bone marrow transplantation techniques to create PrP-expressing or deficient FDCs and lymphocytes.
- Assessing scrapie replication in the spleen and neuroinvasion in the brain.
Main Results:
- Follicular dendritic cells (FDCs) produce high levels of normal prion protein (PrP) in uninfected mice.
- Scrapie replication in the spleen is dependent solely on PrP expression by FDCs.
- PrP expression in lymphocytes or other bone marrow-derived cells does not influence splenic replication or neuroinvasion.
Conclusions:
- Follicular dendritic cells (FDCs) are essential for prion replication in the spleen.
- FDCs are a key cellular target for therapeutic or prophylactic strategies against TSEs.
- Lymphocyte PrP expression is not required for scrapie replication or spread to the brain.