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• W1930649809 abstract "Abstract Interactions between spores of Bacillus anthracis and macrophages are critical for the development of anthrax infections, as spores are thought to use macrophages as vehicles to disseminate in the host. In this study, we report a novel mechanism for phagocytosis of B. anthracis spores. Murine macrophage-like cell line RAW264.7, bone marrow-derived macrophages, and primary peritoneal macrophages from mice were used. The results indicated that activation of the classical complement pathway (CCP) was a primary mechanism for spore phagocytosis. Phagocytosis was significantly reduced in the absence of C1q or C3. C3 fragments were found deposited on the spore surface, and the deposition was dependent on C1q and Ca2+. C1q recruitment to the spore surface was mediated by the spore surface protein BclA, as recombinant BclA bound directly and specifically to C1q and inhibited C1q binding to spores in a dose-dependent manner. C1q binding to spores lacking BclA (ΔbclA) was also significantly reduced compared with wild-type spores. In addition, deposition of both C3 and C4 as well as phagocytosis of spores were significantly reduced when BclA was absent, but were not reduced in the absence of IgG, suggesting that BclA, but not IgG, is important in these processes. Taken together, these results support a model in which spores actively engage CCP primarily through BclA interaction with C1q, leading to CCP activation and opsonophagocytosis of spores in an IgG-independent manner. These findings are likely to have significant implications on B. anthracis pathogenesis and microbial manipulation of complement." @default.
• W1930649809 created "2016-06-24" @default.
• W1930649809 creator A5009583106 @default.
• W1930649809 creator A5018489774 @default.
• W1930649809 creator A5026001064 @default.
• W1930649809 creator A5035122223 @default.
• W1930649809 date "2012-05-01" @default.
• W1930649809 modified "2023-09-27" @default.
• W1930649809 title "Activation of the Classical Complement Pathway by <i>Bacillus anthracis</i> Is the Primary Mechanism for Spore Phagocytosis and Involves the Spore Surface Protein BclA" @default.
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• W1930649809 doi "https://doi.org/10.4049/jimmunol.1102092" @default.
• W1930649809 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3331890" @default.
• W1930649809 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22442442" @default.
• W1930649809 hasPublicationYear "2012" @default.
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