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• W2181412539 abstract "Plasma fibronectin is a circulating protein that facilitates phagocytosis by connecting bacteria to immune cells. A fibronectin isoform, which includes a sequence of 90 AA called extra-domain B (EDB), is synthesized de novo at the messenger RNA (mRNA) level in immune cells, but the reason for its expression remains elusive. We detected an 80-fold increase in EDB-containing fibronectin in the cerebrospinal fluid of patients with bacterial meningitis that was most pronounced in staphylococcal infections. A role for this isoform in phagocytosis was further suggested by enhanced EDB fibronectin release after internalization of Staphylococcus aureus in vitro. Using transgenic mouse models, we established that immune cell production of fibronectin contributes to phagocytosis, more so than circulating plasma fibronectin, and that accentuated release of EDB-containing fibronectin by immune cells improved phagocytosis. In line with this, administration of EDB fibronectin enhanced in vitro phagocytosis to a larger extent than plasma fibronectin. This enhancement was mediated by αvβ3 integrin as shown using inhibitors or cells from β3 integrin knockout mice. Thus, we identified both a novel function for EDB fibronectin in augmenting phagocytosis over circulating plasma fibronectin, as well as the mediating receptor. Our data also establish for the first time, a direct role for β3 integrin in bacterial phagocytosis in mammals.• Fibronectin containing an extra domain called EDB is released in bacterial meningitis. • EDB-containing fibronectin enhances phagocytosis more than plasma fibronectin. • The enhancement is mediated by activation of αvβ3 integrin in the presence of EDB." @default.
• W2181412539 created "2016-06-24" @default.
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• W2181412539 date "2015-12-05" @default.
• W2181412539 modified "2023-10-18" @default.
• W2181412539 title "Identification and characterization of a unique role for EDB fibronectin in phagocytosis" @default.
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• W2181412539 doi "https://doi.org/10.1007/s00109-015-1373-0" @default.
• W2181412539 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4856727" @default.
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• W2181412539 hasPublicationYear "2015" @default.
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