title: Pulmonary pharmacology of DT-TX 30 SE, a potent selective combined thromboxane synthetase inhibitor and receptor antagonist, in guinea pigs.
abstract: A novel chemical compound, DT-TX 30 SE (E-6-(4-2-(4-chlorobenzenesulphonylamino)-ethyl)phenyl)-6-(3-pyrid yl)- hex-5-enoic acid), was studied in various models of guinea pig pulmonary function. The compound was a potent inhibitor (ED50 0.019 mg/kg, i.v.) of bronchospasm induced by the thromboxane receptor agonist U-46619, indicating thromboxane receptor antagonism. At even lower doses (ED50 0.0036 mg/kg, i.v.), it blocked arachidonic acid-induced bronchospasm. Interpretation of the latter results as evidence for additional thromboxane synthetase inhibitory activity was supported by the inhibition of arachidonic acid- or bradykinin-induced thromboxane B2 production in an isolated lung preparation, although prostaglandin E2 and prostaglandin 6-oxo-F(1 alpha) production measured at the same time were not inhibited. The potency of DT-TX 30 SE was compared with thromboxane receptor antagonists and synthetase inhibitors described in the literature. As a receptor antagonist, DT-TX 30 SE was significantly more potent than BM 13505 and BM 13177 (assessed by antagonism of U-46619-induced bronchospasm), but less potent than SQ 29548, while as a thromboxane synthetase inhibitor, it was significantly more potent than OKY 046 and UK 37248 as assessed by antagonism of arachidonic acid-induced bronchospasm or (OKY 046) inhibition of thromboxane production in isolated lung. The compound was active by the oral route as shown by its ability, at 10 mg/kg, p.o., to significantly reduce the immediate allergic response of sensitized guinea pigs to an ovalbumin aerosol.
authors.affiliation: Department of Biological Research, Boehringer Ingelheim KG, Ingelheim/Rhein, Germany.
authors.forename: C J
authors.initials: CJ
authors.lastname: Meade
authors.forename: G
authors.initials: G
authors.lastname: Muacevic
authors.forename: P
authors.initials: P
authors.lastname: Ward
authors.forename: R
authors.initials: R
authors.lastname: Soyka
mesh_terms: D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; D000818:Animals; D016718:Arachidonic Acid / Q000494:pharmacology; D001986:Bronchial Spasm / Q000139:chemically induced / Q000188:drug therapy; D015232:Dinoprostone / Q000096:biosynthesis; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005231:Fatty Acids, Unsaturated / Q000494:pharmacology*; D006168:Guinea Pigs; D008168:Lung / Q000187:drug effects* / Q000502:physiology*; D008297:Male; D011450:Prostaglandin Endoperoxides, Synthetic / Q000494:pharmacology; D011725:Pyridines / Q000494:pharmacology*; D017482:Receptors, Thromboxane / Q000037:antagonists & inhibitors*; D013928:Thromboxane A2 / Q000031:analogs & derivatives / Q000494:pharmacology; D013929:Thromboxane B2 / Q000096:biosynthesis; D013930:Thromboxane-A Synthase / Q000037:antagonists & inhibitors*
chemical_list: D004791:Enzyme Inhibitors; D005231:Fatty Acids, Unsaturated; D011450:Prostaglandin Endoperoxides, Synthetic; D011725:Pyridines; D017482:Receptors, Thromboxane; C085366:6-(4-(2-(((4-chlorophenyl)sulfonyl)amino)ethyl)phenyl)-6-(3-pyridyl)hex-5-enoic acid; D016718:Arachidonic Acid; D013929:Thromboxane B2; D013928:Thromboxane A2; D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; D013930:Thromboxane-A Synthase; D015232:Dinoprostone