Apoptosis in rheumatoid arthritis - expression of Fas, Fas-L, p53, and Bcl-2 in rheumatoid synovial tissues

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Abstract
Recent studies have suggested that apoptosis is one of the pathogenetic mechanisms in rheumatoid arthritis (RA). In this study, by using single and double immunohistochemical staining assays, Fas, Fas-L, p53, and Bcl-2 were measured simultaneously in RA and osteoarthritic (OA) and post-traumatic (PT) synovial tissues (ST) in order to understand the distribution of these apoptosis-related proteins. The TdT-mediated dUTP-biotin nick end labelling (TUNEL) method was performed to detect apoptotic cells. There was a significant increase of Fas, Fas-L, and p53 in RA ST, compared with OA or PT, but no significant difference of Bcl-2 expression was detected between patient groups. In RA ST, expression of Fas and p53 was detected in sub-lining layers and the majority of Fas- and p53-expressing cells were fibroblast-like synoviocytes. A positive correlation between Fas and p53 was demonstrated in RA ST. In RA ST, one-third of Fas-positive and 80% of p53-positive cells were also TUNEL-positive. These results indicate that apoptosis in RA is strongly associated with the expression of Fas and p53, but not Bcl-2. Copyright © 2000 John Wiley & Sons, Ltd.