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- W2912200912 abstract "Abstract GBA1 mutations result in excess storage of glucosylceramide (GC) and the induction of Gaucher disease (GD). GD is frequently associated with elevated levels of pro-inflammatory cytokines and the development of brain inflammation. The mechanisms underlying GC-driven brain inflammation in GD are ill-defined. Recently, we described immune complexes of GC-specific IgG autoantibodies in experimental and clinical GD, which induced massive complement activation and C5a generation. Further, we found that C5a-mediated activation of its cognate C5a receptor 1 (C5aR1) tips the balance between GC formation and degradation, thereby fueling excess GC accumulation and inflammation in visceral tissues in experimental and clinical GD. Previously, the C5a/C5aR1 axis was found to regulate the blood brain barrier integrity in systemic lupus and promote neurodegeneration in Alzheimer’s disease. Here, we determined the production of C5a in the brain of Gba1 D409V/knockout (9V/null) GD-prone mice. C5a production in the brain of 9V/null mice was markedly elevated, when compared to WT control mice. Also, 9V/null mice suffered from massive accumulation of GC in the brain and loss of neurons. To assess the relevance of C5a/C5aR1 axis activation for brain inflammation in GD, we targeted glucocerebrosidase (GCase) with conduritol B epoxide (CBE) in WT and C5aR1−/− mice. Strikingly, CBE-injected WT mice died within 30 days. In contrast, all C5aR1−/− mice survived the 60 days observation window, were protected from CBE-induced accumulation of GC in the brain, showed a marked reduction of microglial cell activation and only a minor loss of neurons. Our data suggest that the C5a/C5aR1 axis is a critical driver of neurodegeneration in experimental GD." @default.
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- W2912200912 date "2017-05-01" @default.
- W2912200912 modified "2023-10-16" @default.
- W2912200912 title "Complement drives neurodegeneration in Gaucher disease" @default.
- W2912200912 doi "https://doi.org/10.4049/jimmunol.198.supp.63.4" @default.
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