PMID: 3768055Oct 1, 1986Paper

Intraarticular ferritin-bound iron in rheumatoid arthritis. A factor that increases oxygen free radical-induced tissue destruction

Arthritis and Rheumatism
P BiemondJ F Koster

Abstract

Iron mobilized from ferritin is able to convert superoxide and hydrogen peroxide, which are produced in large amounts in rheumatoid arthritis (RA), to the extremely toxic hydroxyl radical. We have found that synovial fluid ferritin is increased significantly in RA patients compared with levels in controls. The high synovial fluid:serum ferritin ratio is compatible with the hypothesis that synovial fluid ferritin is derived from the synovial membrane. We found no difference in ferritin concentrations in the synovial membranes of RA patients compared with those of controls. Quantitative data on the amount of iron bound to ferritin showed that the level was 2.9 times higher in RA synovial membranes than in those of controls. Moreover, RA synovial fluid contained considerable amounts of iron bound to ferritin. Calculation of the iron saturation of ferritin revealed that RA synovial membranes contained a mean of 2,210 moles of iron per mole of ferritin: a significant elevation when compared with the mean value of 1,500 moles found in the synovial membranes of the controls. The decreased saturation of ferritin in RA synovial fluid, compared with that in the synovial membrane, could be caused by an uncompensated release of iron from f...Continue Reading

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