Profile of JTE-522 as a human cyclooxygenase-2 inhibitor.
Inhibitory activity and the mechanism of action of JTE-522 (4-(4-cyclohexyl-2-methyloxazol-5-yl)-2-fluorobenzenesulfonamid e), a novel selective cyclooxygenase (COX)-2 inhibitor, on human COX-1 and COX-2 were investigated and compared with those of reference compounds. In an enzyme assay, JTE-522 inhibited yeast-expressed human recombinant COX-2 with an IC50 value of 0.085 microM. In contrast, JTE-522 did not inhibit human COX-1 prepared from human platelets at concentrations up to 100 microM. In a cell-based assay, JTE-522 diminished lipopolysaccharide-induced prostaglandin E2 production in human peripheral blood mononuclear cells (COX-2) (IC50 value = 15.1 nM). On the other hand, JTE-522 was less potent at inhibiting calcium ionophore-induced thromboxane B2 production in washed human platelets (COX-1) (IC50 value = 6210 nM). JTE-522 showed highly selective inhibition of human COX-2, and its activity was more selective than that of other COX-2 inhibitors (NS-398 and SC-58635). Human recombinant COX-2 activity was attenuated by JTE-522 in a dose-dependent and time-dependent manner. In contrast, the inhibitory activity of JTE-522 on human COX-1 was not affected by preincubation time. COX-2 inhibition by JTE-522 could not be recovered by gel filtration. These results indicate that JTE-522 is a highly selective, time-dependent and irreversible inhibitor of human COX-2.
Wakitani
K
K
Biological/Pharmacological Research Laboratories, Central Pharmaceutical Research Institute, Japan Tobacco, Inc., Takatsuki, Osaka.
Nanayama
T
T
Masaki
M
M
Matsushita
M
M
D001557:Benzenesulfonates / Q000494:pharmacology*; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors / Q000494:pharmacology*; D015232:Dinoprostone / Q000378:metabolism; D006801:Humans; D007527:Isoenzymes / Q000187:drug effects* / Q000378:metabolism; D007963:Leukocytes, Mononuclear / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism; D008070:Lipopolysaccharides / Q000494:pharmacology; D008565:Membrane Proteins; D010080:Oxazoles / Q000494:pharmacology*; D011451:Prostaglandin-Endoperoxide Synthases / Q000187:drug effects* / Q000378:metabolism; D013997:Time Factors; D000096926:Benzenesulfonamides
D001557:Benzenesulfonates; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors; D015232:Dinoprostone; D007527:Isoenzymes; D008070:Lipopolysaccharides; D008565:Membrane Proteins; D010080:Oxazoles; D011451:Prostaglandin-Endoperoxide Synthases; C110453:4-(4-cyclohexyl-2-methyloxazol-5-yl)-2-fluorobenzenesulfonamide; D000096926:Benzenesulfonamides; C496511:PTGS1 protein, human; C496540:PTGS2 protein, human