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Synthetic mammalian prions

Giuseppe Legname1, Ilia V Baskakov, Hoang-Oanh B Nguyen

  • 1Institute for Neurodegenerative Diseases, University of California, San Francisco, CA 94143, USA.

Science (New York, N.Y.)
|August 3, 2004
PubMed

Insights

Researchers created infectious prion strains from recombinant mouse prion protein (recMoPrP) amyloid fibrils. These fibrils caused disease in mice, demonstrating that prions are indeed infectious proteins.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Infectious Diseases

Background:

  • Prions are misfolded proteins implicated in neurodegenerative diseases.
  • The infectious nature of prions is well-established, but their in vitro generation remains challenging.
  • Recombinant prion proteins offer a tool to study prion formation and infectivity.

Purpose of the Study:

  • To investigate the potential of polymerized recombinant mouse prion protein (recMoPrP) to form infectious prions.
  • To characterize the neuropathological and transmission properties of prions generated from recMoPrP.

Main Methods:

  • Recombinant mouse prion protein (recMoPrP) was polymerized into amyloid fibrils.
  • These fibrils were intracerebrally inoculated into transgenic mice expressing mouse prion protein (MoPrP).
  • Disease onset, Western blotting for protease-resistant PrP, and transmission studies in wild-type and transgenic mice were performed.

Main Results:

  • Inoculated mice developed neurological dysfunction and showed protease-resistant PrP in brain extracts.
  • Brain extracts transmitted disease to recipient mice, with shorter incubation times in PrP-overexpressing mice.
  • Neuropathological analysis indicated the creation of a novel prion strain.

Conclusions:

  • Polymerized recMoPrP can form infectious prions.
  • These findings provide strong evidence that prions are infectious proteins.
  • This study offers a method for generating infectious prions in vitro for further research.

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