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Updated: May 4, 2026
Protein Misfolding Cyclic Amplification of Prions
Published on: November 7, 2012
Highly infectious prions generated by a single round of microplate-based protein misfolding cyclic amplification
Abstract:
Measurements of the presence of prions in biological tissues or fluids rely more and more on cell-free assays. Although protein misfolding cyclic amplification (PMCA) has emerged as a valuable, sensitive tool, it is currently hampered by its lack of robustness and rapidity for high-throughput purposes. Here, we made a number of improvements making it possible to amplify the maximum levels of scrapie prions in a single 48-h round and in a microplate format. The amplification rates and the infectious titer of the PMCA-formed prions appeared similar to those derived from the in vivo laboratory bioassays. This enhanced technique also amplified efficiently prions from different species, including those responsible for human variant Creutzfeldt-Jakob disease. This new format should help in developing ultrasensitive, high-throughput prion assays for cognitive, diagnostic, and therapeutic applications. IMPORTANCE The method developed here allows large-scale, fast, and reliable cell-free amplification of subinfectious levels of prions from different species. The sensitivity and rapidity achieved approach or equal those of other recently developed prion-seeded conversion assays. Our simplified assay may be amenable to high-throughput, automated purposes and serve in a complementary manner with other recently developed assays for urgently needed antemortem diagnostic tests, by using bodily fluids containing small amounts of prion infectivity. Such a combination of assays is of paramount importance to reduce the transfusion risk in the human population and to identify asymptomatic carriers of variant Creutzfeldt-Jakob disease.
Insights
This study enhances protein misfolding cyclic amplification (PMCA) for faster, more robust prion detection in biological samples. The improved method allows for high-throughput prion detection, aiding in diagnostics and reducing disease transmission risks.
Area of Science:
- Neuroscience
- Biochemistry
- Molecular Biology
Background:
- Cell-free assays are increasingly vital for prion detection in biological tissues and fluids.
- Protein misfolding cyclic amplification (PMCA) is a sensitive prion detection tool but lacks robustness and speed for high-throughput applications.
Purpose of the Study:
- To enhance the protein misfolding cyclic amplification (PMCA) method for increased robustness, rapidity, and high-throughput prion detection.
- To develop a microplate-based PMCA assay capable of amplifying prions within a 48-hour period.
Main Methods:
- Implemented improvements to the PMCA technique to maximize scrapie prion amplification in a single 48-hour round.
- Utilized a microplate format for enhanced PMCA efficiency and suitability for high-throughput screening.
- Validated the amplification rates and infectious titer of PMCA-generated prions against in vivo bioassays.
Main Results:
- Achieved maximum prion amplification in a single 48-hour round using the enhanced PMCA technique.
- Demonstrated that PMCA-formed prions exhibit amplification rates and infectious titers comparable to in vivo bioassays.
- Successfully amplified prions from various species, including those causing human variant Creutzfeldt-Jakob disease.
Conclusions:
- The enhanced PMCA technique offers a fast, reliable, and large-scale method for cell-free prion amplification from various species.
- This improved assay approaches or matches the sensitivity and rapidity of other prion-seeded conversion assays.
- The simplified, high-throughput assay can complement existing methods for urgent antemortem diagnostic tests, crucial for reducing transfusion risks and identifying asymptomatic carriers.
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