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- W2029235869 abstract "The three endothelins ET-1, ET-2 and ET-3 induced a potent contractile response in the human isolated bronchus with an intact epithelium, which proceeded on two different stages. The first stage was observed at low concentrations (high potency) (10(-12) to 10(-9) M) but corresponded to a low intrinsic activity (Emax maximal effect induced by ACh 10(-3) M), the second stage appeared at higher concentrations and corresponded to higher intrinsic activity. The rank order of potency for the two stages of contractile activity was ET-1 greater than ET-2 = ET-3. Removal of the epithelium significantly enhanced the two stages of the contractile responses to the three endothelins and abolished the differences in potency efficacy that were observed between ET-1, ET-2 and ET-3 when the epithelium was present. Phosphoramidon (10(-5) M), an enkephalinase inhibitor, was as potent as epithelium removal in enhancing the contractile responses to these agonists at low concentrations (first stage of contraction, 10(-16) to 10(-9) M). However, with high concentrations of endothelins (greater than 10(-9) M, second stage of contraction), phosphoramidon was less potent than epithelium removal in enhancing the contractile responses. In epithelium-denuded strips, preincubation with phosphoramidon did not further increase the maximal contractions induced by/or the potencies of ET-1, ET-2 or ET-3. After epithelium removal, responses to low doses of endothelins were attenuated by nicardipine (10(-6) M) whereas responses to high doses of the endothelins were not affected, as was also observed when the epithelium was present. (ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2029235869 title "Effect of epithelium removal and of enkephalin inhibition on the bronchoconstrictor response to three endothelins of the human isolated bronchus" @default.
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- W2029235869 doi "https://doi.org/10.1016/0014-2999(92)90418-4" @default.
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