Isolation of Novel Synthetic Prion Strains by Amplification in Transgenic Mice Coexpressing Wild-Type and Anchorless Prion Proteins

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Bibliographische Detailangaben
Zeitschriftentitel:	Journal of Virology
Personen und Körperschaften:	Raymond, Gregory J., Race, Brent, Hollister, Jason R., Offerdahl, Danielle K., Moore, Roger A., Kodali, Ravindra, Raymond, Lynne D., Hughson, Andrew G., Rosenke, Rebecca, Long, Dan, Dorward, David W., Baron, Gerald S.
In:	Journal of Virology, 86, 2012, 21, S. 11763-11778
Format:	E-Article
Sprache:	Englisch
veröffentlicht:	American Society for Microbiology
Schlagwörter:	Virology Insect Science Immunology Microbiology

Details
Zusammenfassung:	<jats:title>ABSTRACT</jats:title> <jats:p> Mammalian prions are thought to consist of misfolded aggregates (protease-resistant isoform of the prion protein [PrP <jats:sup>res</jats:sup> ]) of the cellular prion protein (PrP <jats:sup>C</jats:sup> ). Transmissible spongiform encephalopathy (TSE) can be induced in animals inoculated with recombinant PrP (rPrP) amyloid fibrils lacking mammalian posttranslational modifications, but this induction is inefficient in hamsters or transgenic mice overexpressing glycosylphosphatidylinositol (GPI)-anchored PrP <jats:sup>C</jats:sup> . Here we show that TSE can be initiated by inoculation of misfolded rPrP into mice that express wild-type (wt) levels of PrP <jats:sup>C</jats:sup> and that synthetic prion strain propagation and selection can be affected by GPI anchoring of the host's PrP <jats:sup>C</jats:sup> . To create prions <jats:italic>de novo</jats:italic> , we fibrillized mouse rPrP in the absence of molecular cofactors, generating fibrils with a PrP <jats:sup>res</jats:sup> -like protease-resistant banding profile. These fibrils induced the formation of PrP <jats:sup>res</jats:sup> deposits in transgenic mice coexpressing wt and GPI-anchorless PrP <jats:sup>C</jats:sup> (wt/GPI <jats:sup>−</jats:sup> ) at a combined level comparable to that of PrP <jats:sup>C</jats:sup> expression in wt mice. Secondary passage into mice expressing wt, GPI <jats:sup>−</jats:sup> , or wt plus GPI <jats:sup>−</jats:sup> PrP <jats:sup>C</jats:sup> induced TSE disease with novel clinical, histopathological, and biochemical phenotypes. Contrary to laboratory-adapted mouse scrapie strains, the synthetic prion agents exhibited a preference for conversion of GPI <jats:sup>−</jats:sup> PrP <jats:sup>C</jats:sup> and, in one case, caused disease only in GPI <jats:sup>−</jats:sup> mice. Our data show that novel TSE agents can be generated <jats:italic>de novo</jats:italic> solely from purified mouse rPrP after amplification in mice coexpressing normal levels of wt and anchorless PrP <jats:sup>C</jats:sup> . These observations provide insight into the minimal elements required to create prions <jats:italic>in vitro</jats:italic> and suggest that the PrP <jats:sup>C</jats:sup> GPI anchor can modulate the propagation of synthetic TSE strains. </jats:p>
Umfang:	11763-11778
ISSN:	0022-538X 1098-5514
DOI:	10.1128/jvi.01353-12