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- W2057529727 abstract "Background 5-Lipoxygenase products of arachidonic acid metabolism are thought to play a central role in the secondary amplification of the inflammatory response in a number of human inflammatory diseases, such as ulcerative colitis. MK-0591 (3-(1((4-chlorophenyl)methyl)-3((1,1-dimethyl-ethyl)thio)-5(quinolin-2ylmethyl-oxy)-1H-indol-2yl)-2,2-dimethyl-propanoate) exerts its effect by binding to the 5-lipoxygenase activating protein, thereby inhibiting the translocation and activation of 5-lipoxygenase. Methods Concentrations of leukotriene B4 (LTB4) and prostaglandin E2 (PGE2) in rectal dialysis fluid, ex vivo biosynthesis of LTB4 in whole blood, and urinary excretion of leukotriene E4 (LTE4) from 16 patients with mild to moderately active distally located ulcerative colitis were measured by use of radio-immunoassays in a double-blind, placebo-controlled parallel-design study before and after oral administration of a 250 mg dose of MK-0591 or placebo. Results The mean LTB4 concentration in rectal dialysis fluid was lowered after MK-0591 by >90% (p < 0·05) from 4 to 8 hours, with a maximum inhibition of 97·5% ± 3·4% (mean ± SD) at 20 to 24 hours after dosing, whereas PGE2 was unchanged. In whole blood, MK-0591 decreased ex vivo biosynthesis of LTB4 (p < 0·01), with a maximum inhibition of 96·4% ± 2·1% at 4 hours after dosing. Urinary excretion of LTE4 was reduced by more than 85% (p < 0·001) from 4 to 48 hours. No adverse events were observed. Conclusion These findings show that a single oral 250 mg dose of MK-0591 results in nearly complete blockade of systemic leukotriene production and LTB4 formation in the target tissue of inflammation (the rectum). Controlled multiple-dose trials to assess the clinical efficacy of this novel 5-lipoxygenase-activating protein inhibitor seem to be worthwhile. Clinical Pharmacology & Therapeutics (1995) 57, 335–341; doi:" @default.
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- W2057529727 date "1995-03-01" @default.
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- W2057529727 title "Blockade of leukotriene production by a single oral dose of MK-0591 in active ulcerative colitis" @default.
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- W2057529727 doi "https://doi.org/10.1016/0009-9236(95)90159-0" @default.
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