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Amyloid-beta oligomers increase the localization of prion protein at the cell surface

Fabiana A Caetano1, Flavio H Beraldo, Glaucia N M Hajj

  • 1J. Allyn Taylor Centre for Cell Biology, Robarts Research Institute, University of Western Ontario, London, Ontario, Canada.

Journal of Neurochemistry
|March 1, 2011
PubMed

Insights

Alzheimer's disease amyloid-β oligomers signal through the prion protein (PrP(C)), increasing its cell surface presence. This study reveals PrP(C) as a key player in Aβ-induced cellular dysfunction.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Alzheimer's disease involves amyloid-β (Aβ) peptide interactions at the cell surface, disrupting synaptic function.
  • The prion protein (PrP(C)) is a potential receptor for Aβ, mediating its cellular effects.
  • Understanding Aβ-PrP(C) interactions is crucial for elucidating Alzheimer's pathogenesis.

Purpose of the Study:

  • To investigate the role of PrP(C) as a receptor for Aβ oligomers.
  • To determine if Aβ oligomers signal through PrP(C) in a dependent manner.
  • To explore the effects of Aβ oligomers on PrP(C) trafficking and localization.

Main Methods:

  • Immunofluorescence and flow cytometry to assess PrP(C) localization.
  • Cell surface protein biotinylation to quantify cell surface PrP(C).
  • Live cell confocal and total internal reflection microscopy to study PrP(C) dynamics.

Main Results:

  • Aβ oligomers, but not monomers, increased cell surface localization of PrP(C) in cell lines and neuronal cultures.
  • Aβ oligomers inhibited the endocytosis of PrP(C).
  • Aβ oligomers promoted the clustering of PrP(C) at the cell surface.

Conclusions:

  • Aβ oligomers signal in a PrP(C)-dependent manner, supporting PrP(C)'s role as a receptor.
  • Aβ oligomers alter PrP(C) trafficking, leading to increased cell surface accumulation.
  • These findings provide new insights into the molecular mechanisms of Alzheimer's disease progression.

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