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  • Title: Differences between plasma and synovial fluid fibronectin.
    Author: Scott DL, Carter SD, Coppock JS, Robinson M, Walton KW.
    Journal: Rheumatol Int; 1985; 5(2):49-54. PubMed ID: 3885371.
    Abstract:
    Fibronectin is a high molecular weight glycoprotein of plasma and tissue fluids, and one of its functions is to opsonise particulate material. Chromatographic and electrophoretic analyses showed that the main components of fibronectin are biochemically similar in rheumatoid patients' plasma and synovial fluid. But synovial fluid fibronectin also contains a slow-moving component seen on two-dimensional immunoelectrophoresis, suggesting the presence of fibronectin complexes. Affinity chromatography provided evidence that these involved IgG, and in vitro studies showed that fibronectin influenced the reaction between IgG and anti-IgG. Synovial fluid fibronectin is functionally active in binding to gelatin in an haemagglutination assay, and it gave a relatively higher degree of haemagglutination than did plasma fibronectin, supporting the concept of multivalent fibronectin complexes in synovial fluid. These results suggest synovial fluid fibronectin may be involved in the opsonic removal of IgG-containing complexes from synovial fluid.
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