Abstract
Excess eicosanoid formation during inflammation has been attributed to the expression of the gene coding for the inducible isoform of prostaglandin G/H synthase (PGHS-2). Human and murine PGHS-2 proteins differ in 73 out of the 604 amino acids. When comparing the inhibitory effects of a panel of PGHS-inhibitors in a whole cell human and murine PGHS-2 assay carried out under identical conditions, classical NSAIDs with the exception of aspirin and tenoxicam showed similar inhibitory effects on both human and murine PGHS-2 enzymes. However, the PGHS-2 selective inhibitors nimesulide, flosulide and NS398 showed a much greater inhibition of human PGHS-2. We suggest that these differences could be due to the genetic differences of human and murine PGHS-2.
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