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- W4210814391 abstract "Abstract The complement component C3 is a fundamental plasma protein for host defense. However, recent work has demonstrated the critical importance of local C3 expression in cell survival. Here we analyzed the effects of local versus peripheral sources of C3 expression in a model of bacterial pneumonia. While mice with global C3 deficiency had severe pneumonia-induced lung injury, those deficient in liver-deficient C3 remain protected, comparable to wildtype mice. Human lung transcriptome analysis showed secretory epithelial cells are a major source of C3. Mice with a C3 gene ablation from lung epithelial cells had worse pulmonary injury compared to wild type, despite maintaining normal circulating C3 levels. Finally, in human cellular and mouse pneumonia models, we show that C3 reduces epithelial cell death mediated through the alternative pathway component Factor B. Thus, our findings suggest that a locally-derived C3-Factor B pathway protects the lung mucosal barrier. One Sentence Summary Lung-derived C3 mitigates severe bacterial pneumonia suggesting a novel cytoprotective role at mucosal barrier surfaces independent of circulating C3." @default.
- W4210814391 created "2022-02-08" @default.
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- W4210814391 date "2022-02-05" @default.
- W4210814391 modified "2023-10-12" @default.
- W4210814391 title "Lung epithelial cell-derived C3 protects against pneumonia-induced lung injury" @default.
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- W4210814391 doi "https://doi.org/10.1101/2022.02.03.478963" @default.
- W4210814391 hasPublicationYear "2022" @default.
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