Abstract:
: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. Biopsies were obtained at open surgery from 98 unselected patients with the clinical diagnosis of RA (n = 54) or OA (n = 44). In a three-stage (ABC) immunoperoxidase technique, polyclonal antisera against factor XIIIa and factor XIIIs were investigated. Compared to OA sections. RA synovium showed more FXIIIa-positive cells-monocytes, fibrocytes, fibroblasts and synovial lining cells. In the subsynovial layer, band-like structure of FXIIIa-stained cells was observed in 27.8% of the RA patients, but in only one OA specimen. Higher proportions of FXIIIa-positive monocytes, macrophages, histiocytes and fibroblasts, as well as positive Langhans giant cells and vascular wall regions (except endothelial cells), were observed in RA. OA specimens revealed more intense FXIIIa labeling of these cells with a lower percentage of stained cells. Overall, labeling with FXIIIs antibody resulted in less intense staining. In conclusion, distinction between synovitis caused by RA and synovitis due to OA is possible, as the former show higher numbers of FXIIIa-positive cells, including monocytes, fibroblasts, fibrocytes and synovial lining cells. Further more, RA tissue is stained less intensely than OA tissue. There is evidence for continuous excretion of FXIII in the synovial membrane by the above-mentioned cell systems.
journal_name
Rheumatol Intjournal_title
Rheumatology internationalauthors
Plenz A,Fritz P,König G,Laschner W,Saal JGdoi
10.1007/BF01419952subject
Has Abstractpub_date
1996-01-01 00:00:00pages
29-36issue
1eissn
0172-8172issn
1437-160Xjournal_volume
16pub_type
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