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Updated: Jan 10, 2026

Investigating the Spreading and Toxicity of Prion-like Proteins Using the Metazoan Model Organism C. elegans
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APOE Genotype Differentially Modulates Prion Pathology in a Mouse Model.

Anita M Lizińczyk1, Joanna E Pankiewicz1, William L Cullina1

  • 1New York University Grossman School of Medicine.

Research Square
|November 24, 2025
PubMed
Summary
This summary is machine-generated.

The APOE ε4 allele worsens prion disease by increasing PrPSc accumulation and neuroinflammation, while the ε2 allele also exacerbates the inflammatory response. The ε3 allele appears most protective against prion pathology progression.

Keywords:
Alzheimer’s diseaseapolipoprotein Eastrocytesmicroglianeurodegenerationneuroinflammationprion diseasesprion protein

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Area of Science:

  • Neuroscience
  • Genetics
  • Pathology

Background:

  • Apolipoprotein E (APOE) genotype influences neurodegenerative disease risk and progression.
  • The role of APOE in prion diseases, such as prionoses, is not well understood.
  • APOE polymorphism is known to affect Alzheimer's disease, tauopathies, α-synucleinopathy, and age-related macular degeneration.

Purpose of the Study:

  • To investigate the impact of APOE genotype on neurodegenerative mechanisms in prion pathology.
  • To determine how APOE ε2, ε3, and ε4 alleles affect prion disease progression and neuropathology in mice.

Main Methods:

  • Utilized APOE targeted replacement (TR) mice carrying ε2/ε2, ε3/ε3, and ε4/ε4 genotypes.
  • Inoculated mice with 22L mouse-adapted scrapie strain or normal brain homogenate.
  • Monitored behavioral changes, disease latency, and analyzed brain tissue for neuropathological, biochemical, and transcriptomic markers.

Main Results:

  • APOE ε4/ε4 mice exhibited the shortest disease latency, worst neurological scores, and highest spongiform lesion load.
  • Prion pathology was exacerbated by the ε4 allele, including increased PrPSc accumulation, reduced solubility, and oligomerization.
  • Neuroinflammation markers were highest in ε4/ε4 mice, followed by ε2/ε2, and lowest in ε3/ε3 mice, indicating differential regulation by APOE alleles.

Conclusions:

  • APOE polymorphism significantly influences prion pathology progression through distinct mechanisms.
  • The ε4 allele exacerbates prion disease by enhancing PrPSc conversion/accumulation and neuroinflammation.
  • Both ε4 and ε2 alleles are disadvantageous in prion pathology, with ε3 offering a more favorable outcome.