Abstract
New-variant Creutzfeldt–Jakob disease and scrapie are typically initiated by extracerebral exposure to the causative agent, and exhibit early prion replication in lymphoid organs1,2. In mouse scrapie, depletion of B-lymphocytes prevents neuropathogenesis after intraperitoneal inoculation3,4, probably due to impaired lymphotoxin-dependent maturation of follicular dendritic cells5 (FDCs), which are a major extracerebral prion reservoir6. FDCs trap immune complexes with Fc-γ receptors and C3d/C4b-opsonized antigens with CD21/CD35 complement receptors. We examined whether these mechanisms participate in peripheral prion pathogenesis. Depletion of circulating immunoglobulins or of individual Fc-γ receptors had no effect on scrapie pathogenesis if B-cell maturation was unaffected. However, mice deficient in C3, C1q, Bf/C2, combinations thereof7,8 or complement receptors9 were partially or fully protected against spongiform encephalopathy upon intraperitoneal exposure to limiting amounts of prions. Splenic accumulation of prion infectivity and PrPSc was delayed, indicating that activation of specific complement components is involved in the initial trapping of prions in lymphoreticular organs early after infection.
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Acknowledgements
We thank M. Kosco for the FDC-M1 antibody; K. Rajewsky for μMT mice; C. Farquhar for the 1B3 antiserum; and C. Weissmann for critical reading of the manuscript. This work is supported by the Kanton of Zürich, the Bundesamt für Bildung und Wissenschaft, the Migros and Coop foundations, and by grants of the Swiss National Foundation to AA and RMZ.
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Klein, M., Kaeser, P., Schwarz, P. et al. Complement facilitates early prion pathogenesis. Nat Med 7, 488–492 (2001). https://doi.org/10.1038/86567
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DOI: https://doi.org/10.1038/86567
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