Effect of diclofenac on prostaglandin E and hyaluronic acid production by human synovial fibroblasts stimulated with interleukin‐1.

Abstract
Cultured human synovial fibroblasts were stimulated with human recombinant interleukin 1 beta to overproduce prostaglandin E (PGE) and hyaluronic acid (HA). Diclofenac, indomethacin and hydrocortisone inhibited stimulation of PGE production. Half‐maximal inhibition occurred at 1.10 x 10(‐9), 2.79 x 10(‐8) and at 5.52 x 10(‐8) M, respectively. Diclofenac or indomethacin had no effect on HA production, while hydrocortisone had an inhibitory effect (half‐maximal inhibition at 2.76 x 10(‐7) M). This model could be a useful in vitro indicator for the in vivo pharmacological actions of anti‐inflammatory drugs.