MF498 inhibits PGE2-stimulated cAMP accumulation in a dose-dependent manner (IC50: 1.7 and 17 nM in the absence and presence of 10% serum, respectively). MF498 also displays a relatively good selectivity over other prostanoid receptors, does not compromise the mucosal integrity in the gastrointestinal tract.

MF498 on inflammation in adjuvant-caused arthritis (AIA), a rat model for rheumatoid arthritis (RA), and joint pain in a guinea pig model of iodoacetate-induced osteoarthritis (OA). MF498 relieves joint inflammation and pain in rodent models of rheumatoid and osteoarthritis.