Immunohistochemical detection of factor XIIIa and factor XIIIs in synovial membranes of patients with rheumatoid arthritis or osteoarthritis.

In spite of differences in etiology, RA and OA lead to astonishingly similar synovitic alterations. Fibroblastic transformation of the synovial membrane and an increase in monocytes constitute a rare but highly characteristic feature of RA. Monocytes synthesize factor (F) XIII, implying that FXIII (a and s) in synovial tissue might help to differentiate between RA and OA.

Quantitative photometrical assessment of iron deposits in synovial membranes in different joint diseases.

We investigated 86 synovial membranes from patients suffering either from rheumatoid arthritis (RA) or osteoarthritis (OA). Iron deposits in the synovial membrane were stained by the Prussian blue reaction, and the amount of stained iron was quantitatively assessed by microscope photometry. We found a statistically significant increase in iron deposits in the synovial membrane of RA patients when compared to OA patients.

Morphometric analysis of the angioarchitecture of the synovial membrane in rheumatoid arthritis and osteoarthritis.

Using three different immunohistochemical methods we measured the number of vessels, vessel area and diameter and their form factor in the synovial membrane of 102 patients suffering from different joint disease. The variables were evaluated by means of immunomorphometric analysis. We found UEA (Ulex europeus) immunostaining to be the optimal method for quantification of data characterizing the vasculature of the synovial membrane.

The neo-synovial membrane of patients with active rheumatoid arthritis at resynovectomy. Histomorphological and immunohistological evaluations.

Neo-synovial membranes, which formed after "primary" synovectomy in 21 patients with rheumatoid arthritis (RA), were studied at resynovectomy. The clinical, histomorphological, and immunohistological data were compared with data derived from "primary" synovial membranes from RA and osteoarthritis (OA) patients. The clinical data suggest a less active rheumatoid inflammatory response after synovectomy.

Two-dimensional electrophoresis of synovial tissue, synovial fluid and serum in patients with rheumatoid arthritis and related diseases.

Using the technique of two-dimensional (2D) electrophoresis with consecutive silver staining, we investigated samples of serum, synovial fluid and synovial tissue obtained from 19 patients suffering from rheumatoid arthritis (RA) or non-RA arthritis. From these experiments we have drawn the following conclusions. 2D electrophoresis of serum, synovial fluid and synovial tissue extracts taken from patients suffering from joint diseases is a reproducible method.