Up-regulation of microsomal prostaglandin E synthase 1 in osteoarthritic human cartilage: critical roles of the ERK-1/2 and p38 signaling pathways - Masuko-Hongo, K; Berenbaum, F; Humbert, L; Salvat, C; Goldring, M B; Thirion, S (Arthritis Rheum, 2004)