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Area of Science:

  • Neurobiology
  • Protein misfolding diseases
  • Prion biology

Background:

  • Neurodegenerative diseases like Alzheimer's and Parkinson's involve abnormal protein deposits.
  • Transmissible spongiform encephalopathies (TSEs) are characterized by protease-resistant prion protein (PrP(res)) aggregates.
  • The exact disease-causing species (fibrils vs. oligomers) in TSEs remains debated.

Purpose of the Study:

  • To investigate the relationship between the size of PrP(res) aggregates and their infectivity and converting activity.
  • To determine whether smaller oligomers or larger fibrils are the primary cause of TSE pathogenesis.
  • To characterize the specific size range of PrP(res) aggregates responsible for TSE transmission.

Main Methods:

  • Partial disaggregation of PrP(res) aggregates.
  • Size fractionation of PrP(res) aggregates using chromatography.
  • Analysis of aggregate size, infectivity, and protein converting activity using light scattering and non-denaturing gel electrophoresis.

Main Results:

  • Infectivity and converting activity peaked in non-fibrillar PrP(res) particles of 17-27 nm (300-600 kDa).
  • Large fibrils showed substantially lower activity compared to these smaller particles.
  • Oligomers composed of fewer than or equal to 5 PrP molecules exhibited virtually no infectivity or converting activity.

Conclusions:

  • Non-fibrillar PrP(res) particles, equivalent to 14-28 protein molecules, are the most potent initiators of TSE disease.
  • These findings challenge the notion that large amyloid fibrils are the sole or primary culprits in TSE pathogenesis.
  • The study identifies specific aggregate sizes as key targets for understanding and potentially treating prion diseases.