Prion diseases and the gastrointestinal tract

Area of Science:

• Neuroscience
• Gastroenterology
• Infectious Diseases

Background:

• Transmissible spongiform encephalopathies (TSEs) are fatal neurological diseases caused by infectious prion protein (PrPsc).
• The gastrointestinal (GI) tract's role in TSE pathogenesis and prion transport to the brain is not fully understood.
• Key TSEs include bovine spongiform encephalopathy, scrapie, and Creutzfeldt-Jakob disease (CJD).

Purpose of the Study:

• To elucidate the mechanisms of prion propagation and transport within the GI tract.
• To investigate the involvement of the enteric and autonomic nervous systems in prion disease transmission.
• To identify cellular components crucial for prion spread from the gut to the central nervous system.

Main Methods:

• Review of existing literature on prion disease pathogenesis and GI tract involvement.
• Analysis of the roles of M cells, dendritic cells, B lymphocytes, and follicular dendritic cells in prion transport.
• Examination of PrPsc presence in the enteric nervous system and associated nerve ganglia.

Main Results:

• M cells, dendritic cells, and enteroendocrine cells facilitate prion movement across the GI epithelium.
• Peyer's patches' B lymphocytes, dendritic cells, and follicular dendritic cells are vital for PrPsc propagation.
• PrPsc accumulation in the enteric nervous system and associated nerve ganglia suggests autonomic nervous system involvement in transmission.
• The lymphoreticular system is implicated in gut-to-brain prion transmission.

Conclusions:

• The GI tract is a critical site for initiating and propagating prion diseases.
• The enteric and autonomic nervous systems play significant roles in prion transport to the brain.
• Further research into gut wall cellular interactions is needed for developing effective TSE therapies.