12.1. Summary
The cellular prion protein (PrPC), though apparently innocuous, is the main agent responsible for infectious, familial, and sporadic prion disorders. Through its remarkable ability to undergo a change in conformation from a mainly α-helical to a β-sheet rich conformation commonly referred to as PrP-scrapie (PrPSc), PrPC becomes infectious and pathogenic, a feature that is unique to this glycoprotein1–4. Over the years, most studies have focused on the mechanism of PrPC to PrPSc conversion and its subsequent transmission to susceptible hosts, ignoring the less common familial prion disorders that result from point mutations in the prion protein gene (PRNP). In these disorders, mutant PrP (PrPM) is presumed to undergo a spontaneous change in conformation to PrPSc without participation from an exogenous source of in-fectious PrPSc. Once initiated, the process proceeds exponentially, and deposits of mutant PrPSc are believed to result in the neurotoxicity ob-served in familial cases of prion disorders5,6. However, prion-specific neuropathology is often observed in the absence of detectable PrPSc, indicating the presence of alternative pathways of neurotoxicity incertain cases of prion disorders7. Recent studies on the processing of normal and mutant PrP underscore the importance of abnormal metabolism and various topological forms of PrP in prion disease pathogenesis8. In this chapter, we will review information on the complex pathways of intracellular trafficking and metabolism of normal and various mutant PrP forms, and highlight some of the abnormal pathways that may contribute to neurotoxicity in familial prion disorders.
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Singh, N. et al. (2005). Processing and Mis-Processing of the Prion Protein: Insights into the Pathogenesis of Familial Prion Disorders. In: Brown, D.R. (eds) Neurodegeneration and Prion Disease. Springer, Boston, MA. https://doi.org/10.1007/0-387-23923-5_12
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DOI: https://doi.org/10.1007/0-387-23923-5_12
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