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Background  PrP Sc , the only known constituent of prions, the infectious agents causing prion diseases, can be detected by real-time quaking-induced conversion (RT-QuIC). However, there is no efficient method to quantify the amount of PrP Sc  by RT-QuIC.    Results  Here we introduce quantitative RT-QuIC (qRT-QuIC) to quantify with high accuracy minute amounts of PrP Sc  in the brain and various peripheral tissues at levels far below detection by  in vivo  transmission. PrP Sc  is relatively resistant to treatment with proteinase K (PK). However, as there can also be a fraction of pathological PrP that is digested by PK, we use the term PrP 27-30  to denote to the amount of PrP Sc  that can be detected by immunoblot after PK treatment. qRT-QuIC is based upon the quantitative correlation between the seeded amount of PrP 27-30  and the lag time to the start of the conversion reaction detected by RT-QuIC. By seeding known amounts of PrP 27-30  quantified by immunoblot into qRT-QuIC a standard calibration curve can be obtained. Based on this calibration curve, seeded undetermined amounts of PrP 27-30  can be directly calculated. qRT-QuIC allowed to quantify PrP 27-30  concentrations at extremely low levels as low as 10 -15.5  g PrP 27-30 , which corresponds to 0.001 LD 50  units obtained by  in vivo  i.c. transmission studies. We find that PrP 27-30  concentration increases steadily in the brain after inoculation and can be detected at various time points during the incubation period in peripheral organs (spleen, heart, muscle, liver, kidney) in two experimental scrapie strains (RML, ME7) in the mouse.    Conclusions  We suggest that an automatic quantitative system to measure disease progression as well as prion contamination of organs, blood and food product is feasible. Moreover, the concept of qRT-QuIC should be applicable to measure other disease-associated proteins rich in β-pleated structures (amyloid) that bind ThT and that show seeded aggregation.

acta neuropathologica communications

Establishing quantitative real-time quaking-induced conversion (qRT-QuIC) for highly sensitive detection and quantification of PrPSc in prion-infected tissues