Nonsteroidal antiinflammatory drugs and prostaglandin E(2) modulate the synthesis of osteoprotegerin and RANKL in the cartilage of patients with severe knee osteoarthritis

Arthritis and Rheumatism
Juan Moreno-RubioR Largo

Abstract

Although the osteoprotegerin (OPG)/RANK/RANKL system is the main modulator of bone remodeling, it remains unclear whether it is regulated in cartilage during osteoarthritis (OA). The aim of this study was to examine whether nonsteroidal antiinflammatory drug (NSAID) treatment modulates the synthesis of OPG and RANKL in the cartilage of patients with OA, and to investigate whether prostaglandin E(2) (PGE(2)) modifies this system in human OA chondrocytes in culture. A 3-month clinical trial was carried out in 20 patients with severe knee OA, all of whom were scheduled to undergo knee replacement surgery. Ten of these patients were treated with celecoxib, and the other 10 patients, who did not want to be treated, served as the control group. After surgery, cartilage was processed for molecular biology studies. We also used human OA chondrocytes to examine the effects of PGE(2) on OPG/RANKL synthesis, examining which surface receptors were affected by PGE(2). In patients with OA, celecoxib decreased RANKL synthesis in the cartilage, thereby increasing the OPG:RANKL ratio. In human OA chondrocytes in culture, PGE(2) elicited a dose- and time-dependent increase in the synthesis of RANKL, the extent of which was greater than that of O...Continue Reading

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