Apr 27, 2007

Synovial fibronectin fragmentation and domain expressions in relation to rheumatoid arthritis progression

Magdalena PrzybyszI Katnik-Prastowska


To determine whether the expression of some fibronectin (FN) domains and a degree of FN degradation are associated with the progression of rheumatoid arthritis (RA). Based on the radiographs of the hands of RA patients, three groups of synovial fluid and plasma samples were distinguished: (i) those with early radiological changes, (ii) established and (iii) late progressive radiological changes. The expressions of FN domains were determined by ELISA using appropriate domain-specific monoclonal antibodies. FN fragmentation was analysed by immunoblotting. In the early RA group, synovial FN was found to be totally degraded to a mixture of FN fragments. In the established group, it consisted of a portion of intact FN molecules and a smaller part of FN fragments, whereas in the late group the synovial FN immunoblotting pattern was similar to that of intact FN. The FN fragmentation was accompanied by decreases in FN immune reactivity with monoclonal antibodies specific to the collagen, fibrin and C-terminal FN domains. In the blood plasma of all studied groups of RA patients, the FN immunopattern was analogous to that in normal plasma. However, the expressions of the plasma FN domains were higher than those of healthy individuals. Pr...Continue Reading

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Mentioned in this Paper

Monoclonal Antibodies
Monoclonal antibodies, antineoplastic
Fibrin Measurement
Carboxy-Terminal Amino Acid
Abnormal Fragmented Structure
Plain X-ray
Tertiary Protein Structure
Synovial Membrane

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