Arachidonic acid is converted by microsomal CYP450 enzymes to a variety of epoxides, .omega.-1 and .omega.-hydroxylated compounds via what is known as the epoxidase pathway. MS-PPOH is a selective inhibitor of the epoxygenation reactions catalyzed by specific CYP450 isozymes. MS-PPOH inhibits the formation of arachidonate 11,12-epoxides by CYP4A2 and CYP4A3 enzymes with an IC50 value of 13 uM, but has no effect on the formation of 20-HETE, the .omega.-hydroxylation product of CYP4A1.
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Arachidonic acid is converted by microsomal CYP450 enzymes to a variety of epoxides, .omega.-1 and .omega.-hydroxylated compounds via what is known as the epoxidase pathway.{313,403,823} MS-PPOH is a selective inhibitor of the epoxygenation reactions catalyzed by specific CYP450 isozymes.{8589} MS-PPOH inhibits the formation of arachidonate 11,12-epoxides by CYP4A2 and CYP4A3 enzymes with an IC50 value of 13 uM, but has no effect on the formation of 20-HETE, the .omega.-hydroxylation product of CYP4A1.{8588}