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Differences between plasma and synovial fluid fibronectin.

D L Scott, S D Carter, J S Coppock

    Rheumatology International
    |January 1, 1985
    PubMed
    Summary
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    Fibronectin in rheumatoid joints forms complexes with IgG, potentially aiding in clearing immune complexes. This suggests a role for fibronectin in the joint

    Area of Science:

    • Biochemistry
    • Immunology
    • Rheumatology

    Background:

    • Fibronectin is a glycoprotein involved in opsonization.
    • Rheumatoid arthritis affects joint fluid composition.

    Purpose of the Study:

    • To investigate fibronectin composition and function in rheumatoid synovial fluid.
    • To explore potential fibronectin-IgG interactions in joint inflammation.

    Main Methods:

    • Chromatographic and electrophoretic analyses of fibronectin.
    • Two-dimensional immunoelectrophoresis.
    • Affinity chromatography and in vitro functional assays.

    Main Results:

    • Synovial fluid fibronectin shows biochemical similarity to plasma fibronectin.

    Related Experiment Videos

  • A distinct fibronectin complex involving IgG was identified in synovial fluid.
  • Fibronectin influenced IgG-anti-IgG reactions and showed enhanced binding to gelatin.

    • Conclusions:

    • Synovial fluid fibronectin exists as complexes, notably with IgG.
    • These fibronectin-IgG complexes may play a role in immune complex clearance in rheumatoid joints.
    • Fibronectin's function in synovial fluid may involve opsonic activity against IgG-containing complexes.