Chronic Wasting Disease in Bank Voles: Characterisation of the Shortest Incubation Time Model for Prion Diseases

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In order to assess the susceptibility of bank voles to chronic wasting disease (CWD), we inoculated voles carrying isoleucine or methionine at codon 109 (Bv109I and Bv109M, respectively) with CWD isolates from elk, mule deer and white-tailed deer. Efficient transmission rate (100%) was observed with mean survival times ranging from 156 to 281 days post inoculation. Subsequent passages in Bv109I allowed us to isolate from all CWD sources the same vole-adapted CWD strain (Bv^109ICWD), typified by unprecedented short incubation times of 25–28 days and survival times of ∼35 days. Neuropathological and molecular characterisation of Bv^109ICWD showed that the classical features of mammalian prion diseases were all recapitulated in less than one month after intracerebral inoculation. Bv^109ICWD was characterised by a mild and discrete distribution of spongiosis and relatively low levels of protease-resistant PrP^Sc (PrP^res) in the same brain regions. Despite the low PrP^res levels and the short time lapse available for its accumulation, end-point titration revealed that brains from terminally-ill voles contained up to 10^8,4 i.c. ID₅₀ infectious units per gram. Bv^109ICWD was efficiently replicated by protein misfolding cyclic amplification (PMCA) and the infectivity faithfully generated in vitro, as demonstrated by the preservation of the peculiar Bv^109ICWD strain features on re-isolation in Bv109I. Overall, we provide evidence that the same CWD strain was isolated in Bv109I from the three-cervid species. Bv^109ICWD showed unique characteristics of “virulence”, low PrP^res accumulation and high infectivity, thus providing exceptional opportunities to improve basic knowledge of the relationship between PrP^Sc, neurodegeneration and infectivity.

Vyšlo v časopise: Chronic Wasting Disease in Bank Voles: Characterisation of the Shortest Incubation Time Model for Prion Diseases. PLoS Pathog 9(3): e32767. doi:10.1371/journal.ppat.1003219
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.ppat.1003219

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