Expression of cyclooxygenase 1 and cyclooxygenase 2 in human synovial tissue: differential elevation of cyclooxygenase 2 in inflammatory joint diseases

Arthritis and Rheumatism
I SiegleP Fritz

Abstract

To compare the expression of the cyclooxygenase (COX) isoforms, COX-1 and COX-2, in synovial tissue samples between patients with inflammatory arthritis (i.e., rheumatoid arthritis [RA], ankylosing spondylitis [AS], or psoriatic arthritis [PsA]) and patients with osteoarthritis (OA). Paraffin-embedded sections of synovial tissue from patients with OA (n = 18), RA (n = 35), AS (n = 9), and PsA (n = 16) were immunostained for COX-1 and COX-2. Staining intensity was quantified videodensitometrically from specific synovial cell areas. In addition, samples of OA and RA synovial tissue were analyzed for levels of COX-1 and COX-2 messenger RNA (mRNA) using reverse transcriptase-polymerase chain reaction. Strong COX-2 immunostaining was observed in synovial blood vessel endothelium, synovial lining cells, chondrocytes, and subsynovial fibroblast-like cells in patients with inflammatory arthritides. In the blood vessels, the mean (+/-SD) optical density (MOD) of staining was elevated, especially in AS samples (2.73 +/- 0.63), but also in PsA (1.99 +/- 0.66) and RA samples (1.54 +/- 0.73), in comparison with OA synovial tissue (0.84 +/- 0.30; P < 0.01 versus other groups). COX-1 staining was almost exclusively localized in synovial linin...Continue Reading

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