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• W2950147276 abstract "BackgroundSepsis is a life‐threatening condition often manifested as marked inflammation and severe coagulopathy. Toll‐like receptors (TLRs) play a pivotal role in inflammation, organ dysfunction and mortality in animal sepsis.ObjectivesTo investigate the role of TLR signaling in mediating sepsis‐induced coagulopathy (SIC) in a mouse model.MethodsPolymicrobial sepsis was created by cecal ligation and puncture (CLP) or fecal slurry peritoneal injection. To quantify global clotting function, two viscoelastic assays were performed with rotational thromboelastometry, and the results were presented as maximum clot firmness (MCF): (a) EXTEM to test tissue factor (TF)‐initiated clot formation; and (b) FIBTEM to test EXTEM in the presence of a platelet inhibitor, cytochalasin D. Plasma coagulation factors were quantified with ELISA. TF gene expression and protein expression were determined with real‐time quantitative reverse transcription PCR and flow cytometry, respectively.ResultsBetween 4 and 24 hours after CLP surgery, wild‐type mice showed significant MCF reduction in both EXTEM and FIBTEM tests. This was accompanied by marked thrombocytopenia and a significant increase in the levels of plasminogen activator inhibitor‐1, plasma TF, and D‐dimer. In comparison, TLR2−/− and TLR7−/− CLP mice showed preserved MCF and platelet counts, and near‐normal plasma TF levels. Bone marrow–derived macrophages treated with a TLR2 agonist Pam3cys‐Ser‐(Lys)4 (Pam3cys) or a TLR7 agonist (R837) showed marked increases in TF gene expression and protein expression. MicroRNA‐146a, a newly identified proinflammatory mediator that is upregulated during sepsis, induced TF production via a TLR7‐dependent mechanism.ConclusionsMurine sepsis leads to an increased procoagulant response, thrombocytopenia, and global coagulopathy. TLR2 and TLR7 play an important role in procoagulant production and in SIC." @default.
• W2950147276 created "2019-06-27" @default.
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• W2950147276 date "2019-10-01" @default.
• W2950147276 modified "2023-10-15" @default.
• W2950147276 title "Toll‐like receptors 2 and 7 mediate coagulation activation and coagulopathy in murine sepsis" @default.
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• W2950147276 doi "https://doi.org/10.1111/jth.14543" @default.
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• W2950147276 hasPublicationYear "2019" @default.
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