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Related Experiment Videos

Exosomes: a bubble ride for prions?

Benoît Février1, Didier Vilette, Hubert Laude

  • 1Centre National de la Recherche Scientifique, Unité Mixte de Recherche 144, Institut Curie, 75005 Paris, France.

Traffic (Copenhagen, Denmark)
|December 1, 2004
PubMed
Summary

Cells release exosomes, small vesicles involved in intercellular communication. These exosomes may carry the infectious prion protein, potentially facilitating prion disease transmission between cells without direct contact.

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Area of Science:

  • Cell Biology
  • Neuroscience
  • Biochemistry

Background:

  • Multivesicular bodies (MVBs) are endosomal compartments containing intraluminal vesicles.
  • Exosomes are 50-90 nm vesicles released from cells upon fusion of MVBs with the plasma membrane.
  • Exosomes serve roles in intercellular communication and molecular transfer between cells.

Purpose of the Study:

  • To investigate the role of exosomes in the intercellular transmission of the prion protein.
  • To determine if exosomes can act as vehicles for the infectious prion protein.

Main Methods:

  • Analysis of exosome composition in non-neuronal cell models.
  • Investigating the association of prion protein with secreted exosomes.

Main Results:

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  • Prion protein, a raft-associated component, is sorted into intraluminal vesicles within MVBs.
  • Prion protein has been found to associate with exosomes secreted by certain cell types.
  • Exosomes may facilitate the transfer of prion protein between cells.

Conclusions:

  • Exosomes can be utilized by cells to release intraluminal contents, including proteins.
  • Exosomes represent a potential mechanism for the cell-to-cell transmission of the infectious prion protein.
  • This exosome-mediated pathway could contribute to prion dissemination, bypassing direct cell-cell contact.