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. 1988 Sep;62(9):3120–3127. doi: 10.1128/jvi.62.9.3120-3127.1988

Immunological analysis of host and agent effects on Creutzfeldt-Jakob disease and scrapie prion proteins.

J M Bockman 1, D T Kingsbury 1
PMCID: PMC253428  PMID: 2900341

Abstract

Creutzfeldt-Jakob disease (CJD) and scrapie are degenerative neurological diseases caused by unusual infectious pathogens. The term prion has been introduced to underscore the apparent distinctness of these agents from viruses and viroids. The only macromolecule shown to be associated with the infectious agent, the CJD or scrapie prion protein (PrPCJD or PrPSc, respectively), is encoded by the same gene as a normal cellular protein. In several studies biochemical differences have been reported in PrPScs derived from a common host species infected with different putative strains of the scrapie agent, suggesting agent-specific characteristics independent of the host. We analyzed various agent-host combinations by Western blotting of PrPs that were separated by size or charge. The profile of immunoreactive proteins for CJD prions isolated from mice, guinea pigs, and humans appeared distinct. Importantly, PrPCJDS purified from a human brain and from the corresponding first-passage mouse brains were clearly distinguishable. PrPCJDs isolated from CJD prions propagated in NAMRU or B10.Q mice, which are homozygous for a short-incubation-time gene; from the short-incubation-time backcross progeny of (B10.Q x I/LnJ)F1 x B10.Q; or from NAMRU mice inoculated with I/LnJ prions were identical to each other but distinguishable from those of I/LnJ mice, which are homozygous for the long-incubation-time gene. The PrPs from human CJD and ovine scrapie propagated in the same mouse strain appeared the same, but they were distinct from the same isolate of scrapie passaged in hamsters. Lastly, PrPScs purified from five different strains of scrapie propagated in C57BL mice were identical, including strains, ME7 and 139A, which were previously reported to be distinct. This evidence does not support, although it does not exclude, agent-mediated characteristics independent of host-mediated ones for scrapie and CJD.

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Selected References

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