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- W1974861666 abstract "1 Acetylcholine, ionophore A23187 and melittin induced endothelium-dependent relaxations of preconstricted strips of rabbit aorta. These relaxations are likely to be mediated by endothelium-derived relaxing factor (EDRF). 2 Relaxations in response to acetylcholine (1 μm) were inhibited by the following lipoxygenase inhibitors, with the approximate IC50 values indicated in parentheses: gossypol (1.5 μm), nordi-hydroguairetic acid (NDGA, 5 μm), AA 861 (20 μm), phenidone (30 μm), quercetin (40 μm), BW 755C (300 μm), and piriprost (500 μm); with cirsiliol 50% inhibition was not achieved. Acetylcholine-induced relaxations were also blocked by the cytochrome P-450-mono-oxygenase inhibitors proadifen (SKF 525A, 4 μm), metyrapone (300 μm), and cimetidine (300 μm); 7,8 benzoflavone had no effect up to 100 μm. 3 The more potent inhibitors were also tested against relaxations induced by A23187 (0.1 μm) and melittin (1 μm) and produced partial inhibition of these relaxations. 4 The mechanism of action of the more potent inhibitors was investigated in a bioassay system. EDRF was produced in columns filled with cultured human endothelial cells. The factor was bioassayed with endothelium denuded segments of rabbit femoral artery. When added to effluent of the column, NDGA, AA861, proadifen and metyrapone inhibited the EDRF-induced vasodilatation, whereas gossypol had no effect. Gossypol, however, blocked EDRF production when infused through the column. 5 The more potent inhibitors were also tested to determine their effect on purified soluble guanylate cyclase. While gossypol, NDGA and proadifen had no appreciable effects, basal and nitroprusside (50 μm)-stimulated guanylate cyclase activity was inhibited by AA861 and metyrapone. 6 These data suggest that many of the above compounds inhibit EDRF by mechanisms other than lipoxygenase- or cytochrome P-450-mono-oxygenase inhibition." @default.
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- W1974861666 date "1988-03-01" @default.
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- W1974861666 title "Mechanisms of action of lipoxygenase and cytochrome P-450-mono-oxygenase inhibitors in blocking endothelium-dependent vasodilatation" @default.
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- W1974861666 doi "https://doi.org/10.1111/j.1476-5381.1988.tb10312.x" @default.
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