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Charles E. Mays, … , David Westaway, Jiri G. Safar
Published January 16, 2014
Citation Information: J Clin Invest. 2014;124(2):847-858. https://doi.org/10.1172/JCI72241.
Citation Information: J Clin Invest. 2014;124(2):847-858. https://doi.org/10.1172/JCI72241.
Abstract
The symptoms of prion infection can take years or decades to manifest following the initial exposure. Molecular markers of prion disease include accumulation of the misfolded prion protein (PrPSc), which is derived from its cellular precursor (PrPC), as well as downregulation of the PrP-like Shadoo (Sho) glycoprotein. Given the overlapping cellular environments for PrPC and Sho, we inferred that PrPC levels might also be altered as part of a host response during prion infection. Using rodent models, we found that, in addition to changes in PrPC glycosylation and proteolytic processing, net reductions in PrPC occur in a wide range of prion diseases, including sheep scrapie, human Creutzfeldt-Jakob disease, and cervid chronic wasting disease. The reduction in PrPC results in decreased prion replication, as measured by the protein misfolding cyclic amplification technique for generating PrPSc in vitro. While PrPC downregulation is not discernible in animals with unusually short incubation periods and high PrPC expression, slowly evolving prion infections exhibit downregulation of the PrPC substrate required for new PrPSc synthesis and as a receptor for pathogenic signaling. Our data reveal PrPC downregulation as a previously unappreciated element of disease pathogenesis that defines the extensive, presymptomatic period for many prion strains.
Authors
Charles E. Mays, Chae Kim, Tracy Haldiman, Jacques van der Merwe, Agnes Lau, Jing Yang, Jennifer Grams, Michele A. Di Bari, Romolo Nonno, Glenn C. Telling, Qingzhong Kong, Jan Langeveld, Debbie McKenzie, David Westaway, Jiri G. Safar
Total citations by year
Citation information
Citations to this article (47)
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