Free fatty acids and proinflammatory mediators expression in human articular chondrocytes and fibroblast-like synoviocytes. Il6, cox2 and nos2 mRNA levels assessed by qPCR in normal human articular chondrocytes (A-C), osteoarthritic articular chondrocytes (D-F), and fibroblast-like synoviocytes (G-I) treated with palmitate (0.5 mM), oleate (0.5 mM), or IL-1β (10 pg/ml) as indicated for 24 hours. Values are expressed as mean ± SEM. *, p<0.05.