Migrating intestinal dendritic cells transport PrP(Sc) from the gut

Area of Science:

• Neuroscience
• Immunology
• Veterinary Pathology

Background:

• Transmissible spongiform encephalopathies (TSEs), including bovine spongiform encephalopathy (BSE) and variant Creutzfeldt-Jakob disease (vCJD), are orally acquired neurodegenerative diseases.
• TSE agents replicate in lymphoid tissues before spreading to the central nervous system, with follicular dendritic cells (FDCs) playing a key role in replication and neuroinvasion.
• The mechanism of TSE agent transport from the gut lumen to lymphoid tissues remains unclear.

Purpose of the Study:

• To investigate the role of dendritic cells (DCs) in the transport of disease-associated prion protein (PrPSc) from the intestinal lumen to lymphoid tissues.
• To determine if DCs can acquire and transport PrPSc, potentially acting as a link between the gut and lymphoid replication sites.

Main Methods:

• In vitro experiments to assess PrPSc acquisition by DCs.
• In vivo studies using mouse models to track the transport of intestinally administered PrPSc by DCs to lymphoid tissues.

Main Results:

• Dendritic cells (DCs) were shown to acquire PrPSc in vitro.
• Intestinally administered PrPSc was transported directly by DCs to lymphoid tissues in vivo.
• This demonstrates a cellular pathway for PrPSc translocation from the gut lumen.

Conclusions:

• Dendritic cells (DCs) act as a cellular bridge, facilitating the transport of PrPSc from the gut lumen to lymphoid tissues.
• This DC-mediated transport is a critical step in the initial replication and subsequent spread of TSEs.
• Understanding this mechanism is vital for developing strategies to prevent or mitigate prion diseases.