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A quantitative, highly sensitive cell-based infectivity assay for mouse scrapie prions.

P-C Klöhn1, L Stoltze, E Flechsig

  • 1Medical Research Council Prion Unit, Department of Neurodegenerative Disease, Institute of Neurology, National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, United Kingdom.

Proceedings of the National Academy of Sciences of the United States of America
|September 25, 2003
PubMed
Summary

Researchers developed a new in vitro assay to quantify prion infectivity. This cell-based assay is faster, cheaper, and as sensitive as traditional mouse bioassays for detecting prion diseases.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Infectious Diseases

Background:

  • Prion quantification typically relies on slow, costly, and imprecise mouse bioassays.
  • Prion diseases are characterized by the accumulation of the scrapie form of prion protein (PrPSc).

Purpose of the Study:

  • To develop a quantitative in vitro assay for prion infectivity.
  • To establish a faster, more cost-effective alternative to mouse bioassays for prion detection.

Main Methods:

  • Isolated neuroblastoma N2a sublines highly susceptible to mouse prions.
  • Developed the scrapie cell (SC) assay using susceptible N2a cells exposed to prion samples.
  • Quantified PrPSc-containing cells using automated counting after serial cell splitting.

Main Results:

  • The SC assay demonstrated a linear dose-response over two logs of prion concentrations.
  • The SC assay showed comparable sensitivity to mouse bioassays but was 10 times faster and over 2 orders of magnitude less expensive.
  • Extended SC assays in an endpoint titration format confirmed similar infectivity titers to mouse bioassays.

Conclusions:

  • The developed SC assay provides a robust, rapid, and cost-effective method for quantifying prion infectivity in vitro.
  • This assay is suitable for automation and has the potential to significantly advance prion research and diagnostics.