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- W2012127445 abstract "The central nervous system is the ultimate target of prions, the agents responsible for fatal neurodegenerative diseases known as transmissible spongiform encephalopathies (TSEs). The neuro-invasive phase and its related clinical signs take place after a long incubation period. During this asymptomatic phase, however, active transport and replication of the infectious agent take place in peripheral sites. The oral infection route has been extensively studied because of its implication in the recent epidemic of bovine spongiform encephalopathy (BSE) in cattle and of the resulting human cases of variant Creutzfeldt-Jakob disease (vCJD). Rodent models have been useful in studying some aspects of this pathogenesis. Now, new data on the initial steps of oral infection have been obtained in sheep. This species is naturally infected with scrapie by horizontal transmission and there is strong evidence implicating the oral route. Furthermore, the existence of resistant and susceptible genotypes offers the possibility of comparative studies. The data were obtained using surgical and biochemical procedures to modulate the efficiency of oral infection and show that, in sheep, the abnormal prion protein (PrP) associated with the infectious agent crosses the intact intestinal barrier at the level of the enterocytes and then passes rapidly into lymph. These steps are identical in susceptible and resistant sheep. Thereafter, replication takes place in lymphoid structures. Other results in the same study indicate that alimentary fluids almost completely degrade the PrP of the inoculum. Though not directly transposable to human diseases, in which it is not possible to study these early stages, these data allow the elaboration of a simplified concept for the pathogenesis of TSEs. They also suggest that human contamination at the level of the oral cavity might be more important than previously suspected." @default.
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- W2012127445 date "2006-01-01" @default.
- W2012127445 modified "2023-09-26" @default.
- W2012127445 title "What can we learn from the oral intake of prions by sheep?" @default.
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- W2012127445 doi "https://doi.org/10.1002/path.1977" @default.
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