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Volume 81, Issue 11

PrP expression in the peripheral nervous system is a determinant of prion neuroinvasion Free

Abstract

Transmissible spongiform encephalopathies are often propagated by extracerebral inoculation. The mechanism of spread from peripheral portals of entry to the central nervous system (neuroinvasion) is complex: while lymphatic organs typically show early accumulation of prions, and B-cells and follicular dendritic cells are required for efficient neuroinvasion, actual entry into the central nervous system occurs probably via peripheral nerves and may utilize a PrP-dependent mechanism. This study shows that transgenic mice overexpressing PrP undergo rapid and efficient neuroinvasion upon intranerval and footpad inoculation of prions. These mice exhibited deposition of the pathological isoform of the prion protein (PrP) and infectivity in specific portions of the central and peripheral sensory pathways, but almost no splenic PrP accumulation. In contrast, wild-type mice always accumulated splenic PrP, and had widespread deposition of PrP throughout the central nervous system even when prions were injected directly into the sciatic nerve. These results indicate that a lympho-neural sequence of spread occurs in wild-type mice even upon intranerval inoculation, while overexpression of PrP leads to substantial predilection of intranerval over lymphoreticular spread. The rate of transport of infectivity in peripheral nerves was ca. 0·7 mm per day, and prion infectivity titres of sciatic nerves were much higher in a than in wild-type mice, suggesting that overexpression of PrP modulates the capacity for intranerval transport.

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© Microbiology Society
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2000-11-01
2024-04-24
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PrPC expression in the peripheral nervous system is a determinant of prion neuroinvasion
J. Gen. Virol. 81, 2813 (2000); https://doi.org/10.1099/0022-1317-81-11-2813
/content/journal/jgv/10.1099/0022-1317-81-11-2813
/content/journal/jgv/10.1099/0022-1317-81-11-2813
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