Administration of L-Type Bovine Spongiform Encephalopathy to Macaques to Evaluate Zoonotic Potential

Area of Science:

• Neuroscience
• Infectious Diseases
• Veterinary Medicine

Background:

• Bovine spongiform encephalopathy (BSE) is a fatal neurodegenerative disease in cattle.
• Prions, misfolded proteins, are the infectious agents responsible for transmissible spongiform encephalopathies (TSEs).
• Understanding prion transmission dynamics is crucial for public health and preventing zoonotic diseases.

Purpose of the Study:

• To assess the potential for L-type BSE prions to transmit to humans.
• To investigate the infectivity and tissue distribution of BSE prions in a non-human primate model.

Main Methods:

• Macaques were inoculated with L-type BSE prions.
• Clinical monitoring for 75 months post-inoculation.
• Prion detection using Western blot, immunohistochemistry, and protein misfolding cyclic amplification (PMCA).

Main Results:

• No clinical signs of disease were observed in inoculated macaques during the 75-month observation period.
• Standard detection methods (Western blot, immunohistochemistry) failed to detect prions in any tested tissues.
• Protein misfolding cyclic amplification (PMCA) successfully detected prions in nerve and lymphoid tissues, indicating subclinical infection.

Conclusions:

• L-type BSE prions may not cause overt disease in macaques within 75 months.
• Sensitive detection methods like PMCA are essential for identifying prion presence in subclinically infected individuals.
• Further research is needed to fully understand the long-term implications and zoonotic potential of L-type BSE prion infection.