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• W1835632006 endingPage "1525" @default.
• W1835632006 startingPage "1518" @default.
• W1835632006 abstract "Components derived from cartilage have been suggested to maintain the inflammation in joints in arthritis. Small leucine-rich repeat proteins (SLRPs) are structural components of cartilage important in organizing the meshwork of extracellular matrix components. It has recently been shown that the SLRP fibromodulin interacts with complement initiator C1q, leading to complement activation. The complement response is limited since fibromodulin also interacts with the complement inhibitor factor H. We have now found that osteoadherin, chondroadherin, fibromodulin, and proline arginine-rich end leucine-rich repeat protein bind to the complement inhibitor C4b-binding protein (C4BP). Using direct binding assays with C4BP fragments and C4BP mutants lacking individual domains in combination with electron microscopy, we have demonstrated that mainly the central core of C4BP mediated binding to SLRPs. Binding of SLRPs to C4BP did not affect its ability to inhibit complement. Osteoadherin, fibromodulin, and chondroadherin, which bind C1q and activate complement, were found to cause significantly higher C9 deposition in C4BP-depleted serum compared with Igs, indicating that the level of complement activation initiated by SLRPs is regulated by simultaneous binding to C4BP. A similar dual binding of C1q and complement inhibitors was observed previously for other endogenous ligands (amyloid, prions, C-reactive protein, and apoptotic cells) but not for exogenous activators (bacteria-bound Igs). These interactions can be significant during inflammatory joint diseases, such as rheumatoid arthritis, where cartilage is degraded, and cartilage components are released into synovial fluid, where they can interact with factors of the complement system." @default.
• W1835632006 created "2016-06-24" @default.
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• W1835632006 date "2009-02-01" @default.
• W1835632006 modified "2023-10-16" @default.
• W1835632006 title "Complement Inhibitor C4b-Binding Protein Interacts Directly with Small Glycoproteins of the Extracellular Matrix" @default.
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• W1835632006 doi "https://doi.org/10.4049/jimmunol.182.3.1518" @default.
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• W1835632006 hasPublicationYear "2009" @default.
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