Different levels of COX-1 and COX-2 enzymes in synoviocytes and chondrocytes during joint contracture formation

• Published in: Journal of rheumatology 2001-09, Vol.28 (9), p.2066-2074
• Main Authors: TRUDEL, Guy, DESAULNIERS, Nancy, UHTHOFF, Hans K, LANEUVILLE, Odette
• Format: Article
• Language: English
• Subjects: Animals; Biological and medical sciences; Cells, Cultured; Chondrocytes - enzymology; Contracture - enzymology; Contracture - pathology; Disease Models, Animal; Fundamental and applied biological sciences. Psychology; Immunoblotting; Immunohistochemistry; Knee Joint; Male; Probability; Prostaglandin-Endoperoxide Synthases - analysis; Prostaglandin-Endoperoxide Synthases - metabolism; Rats; Rats, Sprague-Dawley; Reference Values; Sensitivity and Specificity; Skeleton and joints; Statistics, Nonparametric; Synovial Membrane - cytology; Synovial Membrane - enzymology; Vertebrates: osteoarticular system, musculoskeletal system
• ISSN: 0315-162X; 1499-2752

OBJECTIVE: To measure the levels of prostaglandin endoperoxide H synthase (PGHS) isozymes (or cyclooxygenase, COX) in vivo during the development of joint contractures secondary to immobilization in rats. METHODS: Rats had one knee joint immobilized for up to 32 weeks. Three groups were compared: 47 rats had knee joints immobilized, 38 animals had sham surgery, and 13 unoperated animals served as controls. Levels of PGHS-1 and PGHS-2 enzymes were characterized in the chondrocytes and synoviocytes of the knee joint by immunohistochemistry. Immunostaining intensity was quantified by microscopy using conventional analysis. RESULTS: PGHS-1 level was lower in synoviocytes of the anterior capsule compared with shams (1.3 vs 2.0; p < 0.05). PGHS-2 level was also lower in synoviocytes of the posterior capsule (1.8 vs 2.3; p < 0.05), but higher in chondrocytes at the anterior aspect of the tibia compared with shams (1.6 vs 0.8; p < 0.05). PGHS-2 staining was increased in chondrocytes at the posterior, opposed, and anterior aspects of the tibia compared with controls (1.1, 0.6, 0.8 vs 0.2, 0.1, 0.2, respectively; all p < 0.05). CONCLUSION: Immobility induced joint contractures are characterized by a contrasting cellular pattern of PGHS enzyme levels: decreased in the synovium and increased in the chondrocytes. These findings suggest that chondrocytic PGHS isoenzymes are important in cartilage degradation of contractured joints.