Scrapie replication in lymphoid tissues depends on prion protein-expressing follicular dendritic cells
Summary
This summary is machine-generated.Transmissible spongiform encephalopathies (TSEs) involve the immune system, with prion protein (PrP) replication in spleen depending on follicular dendritic cells (FDCs), not lymphocytes. This clarifies FDC roles in prion disease pathogenesis.
Area Of Science
- Neuroimmunology
- Prion Biology
- Infectious Diseases
Background
- Transmissible spongiform encephalopathies (TSEs), or prion diseases, are linked to immune system pathogenesis.
- Peripheral infection routes lead to agent replication in spleen and lymph nodes before neuroinvasion.
- Understanding cellular replication sites is key for early pathogenesis insights and potential therapies, such as for variant Creutzfeldt-Jakob disease.
Purpose Of The Study
- To elucidate the specific roles of follicular dendritic cells (FDCs) and lymphocytes in scrapie pathogenesis.
- To determine whether FDCs or lymphocytes are essential for prion protein (PrP) replication in lymphoid tissues.
Main Methods
- Generation of chimeric mice with differential PrP expression in FDCs versus other immune cells.
- Bone marrow transplantation between PrP-deficient and PrP-expressing mice.
- Analysis of scrapie agent replication in spleen using these chimeric models.
Main Results
- Follicular dendritic cells (FDCs) are confirmed to produce the host prion protein (PrP).
- Replication of a mouse-passaged scrapie strain in the spleen is critically dependent on PrP-expressing FDCs.
- Lymphocytes and other bone marrow-derived cells are not essential for splenic scrapie replication.
Conclusions
- Follicular dendritic cells (FDCs) play a crucial, PrP-dependent role in the initial replication of the scrapie agent in the spleen.
- These findings highlight FDCs as key cellular players in early prion disease pathogenesis and potential therapeutic targets.
View abstract on PubMed