Chondroprotective effect of three different classes of anti-inflammatory agents on human osteoarthritic chondrocytes exposed to IL-1β. S. Cheleschi, N. A. Pascarelli, G. Valacchi, A. Di Capua, M. Biava, G. belmonte, A. Giordani, C. Sticozzi, M. Anzini, A. Fioravanti

VA694, a promising cyclooxigenase-2 (COX-2)-inhibiting hybrid drug endowed with nitric oxide (NO) releasing properties (NO-COXIB), showed COX-2-selective inhibitory effects, associated with interesting anti-inflammatory and anti-nociceptive activities. Therefore, we studied the effects of VA694 on cartilage metabolism, in comparison with Naproxcinod, a COX inhibitor and NO donor (CINOD), and Naproxen, a traditional non-steroidal-anti-inflammatory drug (NSAID) on human osteoarthritic chondrocyte cultures. IL-1β-stimulated chondrocytes showed a significant decrease in cell viability (P<0.001). VA694, Naproxcinod and Naproxen alone didn't significantly affect cell viability, while it restored cell viability in cultures stimulated by IL-1β. The presence of IL-1β determined a significant increase (P