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Classical natural ovine scrapie prions detected in practical volumes of blood by lamb and transgenic mouse bioassays
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  • Classical natural ovine scrapie prions detected in practical volumes of blood by lamb and transgenic mouse bioassays
저자명
Rohana P. Dassanayake, Thomas C. Truscott, Dongyue Zhuang, David A. Schneider, Sally A. Madsen-Bouterse, Alan J. Young, James B.
간행물명
Journal of Veterinary ScienceKCI,SCIE,SCOPUS
권/호정보
2015년|16권 2호(통권58호)|pp.179-186 (8 pages)
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대한수의학회|한국
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정기간행물|ENG|
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영문초록

Scrapie is diagnosed antemortem in sheep by detecting misfolded isoforms of prion protein (PrP) in lymphoid follicles of the rectal mucosa and nictitating membranes. Assay sensitivity is limited if (a) the biopsy is collected early during disease development, (b) an insufficient number of follicles is collected, or (c) peripheral accumulation of PrP is reduced or delayed. A blood test would be convenient for mass live animal scrapie testing. Currently approved techniques, however, have their own detection limits. Novel detection methods may soon offer a non-animal-based, rapid platform with detection sensitivities that rival the prion bioassay. In anticipation, we sought to determine if diseased animals could be routinely identified with a bioassay using B lymphocytes isolated from blood sample volumes commonly collected for diagnostic purposes in small ruminants. Scrapie transmission was detected in five of six recipient lambs intravenously transfused with B lymphocytes isolated from 5∼10 mL of blood from a naturally scrapie-infected sheep. Additionally, scrapie transmission was observed in 18 ovinized transgenic Tg338 mice intracerebrally inoculated with B lymphocytes isolated from 5∼10 mL of blood from two naturally scrapie-infected sheep. Based on our findings, we anticipate that these blood sample volumes should be of diagnostic value. 

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