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Updated: Jul 24, 2026
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Protein Misfolding Cyclic Amplification of Prions
Published on: November 7, 2012
19.5K
Optimization and evaluation of new decontamination procedures inactivating human prions
L Herzog1, F Reine1, J Castille2
1Molecular Virology Immunology (VIM) Unit, Université Paris-Saclay, INRAE, UVSQ, Jouy-en-Josas, France.
The Journal of Hospital Infection
|February 14, 2025
Summary
A new prion-inactivating formulation, TFD Premium, effectively decontaminates medical instruments and wastewater, outperforming current standards. This offers a promising solution for prion disease prevention and control.
Area of Science:
- Neuroscience
- Infectious Diseases
- Biochemistry
Background:
- Prions are unique infectious agents composed solely of protein, lacking effective treatments.
- A critical need exists for potent prion-inactivating agents and reliable evaluation methods for human prion diseases.
Purpose of the Study:
- To compare protein misfolding cyclic amplification (PMCA) with infectivity bioassays for evaluating prion-inactivating treatments.
- To introduce and assess a novel formulation, TFD Premium, against human prions.
Main Methods:
- Stainless steel wires contaminated with humanized prion strains were treated with TFD Premium or WHO-recommended agents.
- Residual prion infectivity and seeding activity were measured using cell-free PMCA and bioassays.
- Human-derived prion isolates and humanized prions were used to evaluate inactivation efficacy.
Main Results:
- TFD Premium demonstrated superior decontamination of humanized prions compared to 1 N NaOH.
- Certain prion strains, like Tg650-sCJD-VV2, exhibited higher resistance to inactivation than vCJD prions.
- PMCA assays showed excellent correlation with bioassays for quantifying prion infectivity.
Conclusions:
- TFD Premium effectively inactivates human prions, matching or exceeding WHO reference methods.
- The formulation is suitable for reprocessing medical devices in healthcare settings.
- Robust evaluation protocols combining PMCA and bioassays are established for prion-inactivation research.
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