Dissociation between transmissible spongiform encephalopathy (TSE) infectivity and proteinase K-resistant PrP(Sc) levels in peripheral tissue from a murine transgenic model of TSE disease.

Abstract:

:Most current diagnostic tests for transmissible spongiform encephalopathies (TSE) rely on the presence of proteinase K (PK)-resistant PrP(Sc) (PrP-res) in postmortem tissues as an indication of TSE disease. However, a number of studies have highlighted a discrepancy between TSE infectivity and PrP-res levels in both natural and experimental cases of TSE disease. Previously, we have shown high TSE infectivity levels in the brain tissue of mice that have a clinical TSE disease with associated vacuolar pathology but little or no detectable PrP-res. Here, the levels of TSE infectivity and PrP-res within a peripheral tissue of this mouse model were investigated. Biochemical analysis showed that low levels of PrP-res were present in the spleen tissue in comparison to the levels observed in the spleen of mice infected with ME7 or 79A. However, upon subpassage of brain and spleen tissue from clinically ill mice with little or no PrP-res detectable, similar short incubation periods to disease were observed, indicating that infectivity levels were similarly high in both tissues. Thus, the discrepancy between PrP-res and TSE infectivity was also present in the peripheral tissues of this disease model. This result indicates that peripheral tissues can contain higher levels of infectivity given the correct combination of host species, PrP genotype, and TSE agent. Therefore, the assumption that the levels of peripheral infectivity are lower than those in the central nervous system is not always correct, and this could have implications for current food safety regulations.

journal_name

J Virol

journal_title

Journal of virology

authors

Dobie K,Barron R

doi

10.1128/JVI.03469-12

subject

Has Abstract

pub_date

2013-05-01 00:00:00

pages

5895-903

issue

10

eissn

0022-538X

issn

1098-5514

pii

JVI.03469-12

journal_volume

87

pub_type

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