Complement facilitates early prion pathogenesis

Michael A. Klein, Pascal S. Kaeser, Petra Schwarz, Heiko Weyd, Ioannis Xenarios, Rolf M. Zinkernagel, Michael C. Carroll, J. Sjef Verbeek, Marina Botto, Mark J. Walport, Hector Molina, Ulrich Kalinke, Hans Acha-Orbea, Adriano Aguzzi

Research output: Contribution to journalArticlepeer-review

289 Scopus citations


New-variant Creutzfeldt-Jakob disease and scrapie are typically initiated by extracerebral exposure to the causative agent, and exhibit early prion replication in lymphoid organs. In mouse scrapie, depletion of B-lymphocytes prevents neuropathogenesis after intraperitoneal inoculation, probably due to impaired lymphotoxin-dependent maturation of follicular dendritic cells (FDCs), which are a major extracerebral prion reservoir. 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 thereof or complement receptors 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.

Original languageEnglish
Pages (from-to)488-492
Number of pages5
JournalNature medicine
Issue number4
StatePublished - 2001


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