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• W2041777500 abstract "Selective inhibitors of prostaglandin synthase-2 (PGHS-2) possess potent anti-inflammatory, antipyretic, and analgesic properties but demonstrate reduced side-effects (e.g. gastrotoxicity) when compared with nonselective inhibitors of PGHS-1 and -2. We investigated the mechanism of the differential inhibition of human PGHS-1 (hPGHS-1) and -2 (hPGHS-2) in intact cells by nonsteroidal anti-inflammatory drugs (NSAIDs) and examined factors that contribute to the increased potency of PGHS inhibitors observed in intact cells versus cell-free systems. In intact Chinese hamster ovary (CHO) cell lines stably expressing the hPGHS isozymes, both PGHS isoforms exhibited the same affinity for arachidonic acid. Exogenous and endogenous arachidonic acid were used as substrates by both CHO [hPGHS-1] and CHO [hPGHS-2] cell lines. However, differences were observed in the ability of the hPGHS isoforms to utilize endogenous arachidonic acid released intracellularly following calcium ionophore stimulation or released by human cytosolic phospholipase A2 transiently expressed in the cells. Cell-based screening of PGHS inhibitors demonstrated that the selectivities and potencies of PGHS inhibitors determined using intact cells are affected by substrate concentration and differ from that determined in cell-free microsomal or purified enzyme preparations of PGHS isozymes. The mechanism of inhibition of PGHS isozymes by NSAIDs in intact cells involved a difference in their time-dependent inhibition. Indomethacin displayed time-dependent inhibition of cellular hPGHS-1 and -2. In contrast, the selective PGHS-2 inhibitor NS-398 exhibited time-independent inhibition of hPGHS-1 but time-dependent inhibition of hPGHS-2 in intact cells. Reversible inhibition of cellular CHO [hPGHS-1] and CHO [hPGHS-2] was observed with the nonselective NSAIDs ibuprofen and indomethacin, whereas inhibition by the selective PGHS-2 inhibitor DuP-697 was reversible against hPGHS-1 but irreversible against hPGHS-2." @default.
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• W2041777500 date "1996-10-01" @default.
• W2041777500 modified "2023-09-26" @default.
• W2041777500 title "Mechanism of selective inhibition of human prostaglandin G/H synthase-1 and -2 in intact cells" @default.
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• W2041777500 doi "https://doi.org/10.1016/0006-2952(96)00462-5" @default.
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