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• W1973178786 abstract "Endothelins (ETs) are synthesized not only in vascular endothelial cells but also in airway epithelial cells.Increased ET-1 has been demonstrated in bronchial epithelium of asthmatic patients, and, in severe asthma attacks, ET-1 increases in plasma and bronchoalveolar lavage fluid. In this study, we investigated whether ketamine (KET) relaxes ET-induced tracheal contractions. Female guinea pigs were killed with an overdose of pentobarbital. The trachea was removed and cut spirally into two strips that were mounted in an organ bath filled with Krebsbicarbonate buffer. The response of each strip to 10-7 M carbachol was taken as 100% contraction to which the response to ET was referred. The contribution of the epithelium to the relaxant effect of KET was studied in denuded tracheae or in the presence of 5 x 10-5 M indomethacin. ET-1 (3 x 10-8 M) induced contractions that were 76 +/- 3% of those induced by carbachol. KET reversed the response to ET-1 in a dose-dependent fashion. Similarly, ET-2 (3 x 10-8 M) induced contractions that were 74 +/- 5% of those induced by carbachol, and KET also reversed this response in a dose-dependent manner. In epithelium-denuded strips, ET-1 induced contractions that were 104 +/- 3% of those induced by carbachol, and KET still reversed this response. The tonic phase of the response to ET-1 was equal (100 +/- 6%) to the response to carbachol, and KET did not affect it significantly. In the presence of ryanodine, KET reduced the ET-1-induced contraction from 67 +/- 2% to 36 +/- 3.%, P < 0.01. In the presence of nicardipine, KET also inhibited the ET-1-induced contraction. We conclude that KET relaxes the tracheal smooth muscle contracted by ETs via a mechanism that is independent of the tracheal epithelium. The relaxant effect of KET on the ET-induced contraction of the trachealis muscle is not dependent upon blockade of 1) sarcolemma influx of Ca (2+) through the dihydropyridine Ca2+ channel or 2) the release of intracellular Ca2+ through the ryanodine-sensitive intracellular Ca2+ channel. It is likely that the action of KET relaxing ET-induced tracheal contractions is at some point of the inositol 1,4,5-trisphosphate signaling pathway. (Anesth Analg 1997;84:900-6)" @default.
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• W1973178786 date "1997-04-01" @default.
• W1973178786 modified "2023-10-17" @default.
• W1973178786 title "Ketamine Relaxes Airway Smooth Muscle Contracted by Endothelin" @default.
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• W1973178786 doi "https://doi.org/10.1097/00000539-199704000-00036" @default.
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