Abbreviations
COX-2: cyclooxygenase-2; ECL: enhanced chemiluminescence; ELISA: enzyme-linked immunosorbent assay; FLS: fibroblast-like synoviocyte; IL: interleukin; LPS: lipopolysacchride; MMP: matrix metalloproteinase; OA: osteoarthritis; PCR: polymerase chain reaction; PGE2: prostaglandin E2; RA: rheumatoid arthritis; TNF-α: tumor necrosis factor-alpha; VEGF: vascular endothelial growth factor.