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Updated: May 9, 2025
Organotypic Slice Culture of E18 Rat Brains
Published on: July 11, 2007
Prion replication in organotypic brain slice cultures is distinct from in vivo inoculation and is species dependent
Jessy A Slota1,2, Lise Lamoureux1, Jennifer Myskiw1,2
1Mycobacteriology, Vector-Borne and Prion Diseases Division, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, MB, Canada.
Abstract:
Cultured brain slices rapidly replicate murine prions, exhibit prion pathology, and are amenable towards drug discovery, but have not been infected with human prions. As deer mice (Peromyscus maniculatus) are susceptible to human prions in vivo, here we investigated deer mouse organotypic brain slice cultures as a potential model of human prion disease. Deer mouse brain slices supported replication of rodent-adapted strains of scrapie and Creutzfeldt-Jakob disease (CJD), but they resisted infection with primary human prion inoculum. To better understand this discrepancy, we quantified prion replication rates, characterized cellular and molecular changes, and estimated inoculum clearance within wildtype CD1 and deer mouse brain slice cultures. Prion replication rates varied by species, strain, and brain region, independently of PrP sequence homology. Scrapie-infected CD1 cerebellar slice cultures exhibited the fastest prion replication rate, closely matching in vivo bioassay kinetics and showing neuronal and synaptic degeneration at similar timepoints. However, deer mouse slice cultures replicated deer mouse-adapted sCJD MM1 prions less efficiently than in vivo inoculation. These findings clarify both the utility and constraints of brain slice cultures in modeling prion disease and imply that the slice culture molecular environment may be suboptimal for human prion replication.
Insights
Deer mouse brain slices can replicate some prion strains but resist human prion infection, indicating limitations for modeling human prion diseases. Further research is needed to optimize these models.
Area of Science:
- Neuroscience
- Infectious Diseases
- Biomedical Research
Background:
- Organotypic brain slice cultures are valuable models for studying prion diseases and drug discovery.
- Previous studies have shown susceptibility to murine prions but not human prions in these cultures.
Purpose of the Study:
- To investigate deer mouse organotypic brain slice cultures as a model for human prion disease.
- To understand the discrepancy in prion replication between different species and prion strains.
Main Methods:
- Cultured brain slices from deer mice and CD1 mice were infected with various prion strains.
- Prion replication rates, cellular changes, and molecular alterations were quantified.
- Inoculum clearance was estimated in both species' brain slice cultures.
Main Results:
- Deer mouse brain slices replicated rodent-adapted scrapie and Creutzfeldt-Jakob disease (CJD) strains.
- Primary human prion inoculum failed to infect deer mouse brain slices.
- Prion replication rates varied by species, strain, and brain region, independent of PrP sequence homology.
- Scrapie-infected CD1 cerebellar slices showed rapid prion replication and pathology, mirroring in vivo kinetics.
Conclusions:
- Deer mouse brain slice cultures have utility and limitations in modeling prion diseases.
- The molecular environment of slice cultures may be suboptimal for efficient human prion replication.
- These findings clarify the applicability of brain slice cultures for prion disease research.
