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. 1994 Apr;111(4):1009–1016. doi: 10.1111/j.1476-5381.1994.tb14844.x

Characterization of ETB receptors mediating contractions induced by endothelin-1 or IRL 1620 in guinea-pig isolated airways: effects of BQ-123, FR139317 or PD 145065.

B Battistini 1, T D Warner 1, A Fournier 1, J R Vane 1
PMCID: PMC1910170  PMID: 8032583

Abstract

1. We have characterized the receptors mediating contractions to endothelin-1 (ET-1) or IRL 1620, an ETB receptor selective agonist, in isolated strips of tissue prepared from different parts of the guinea-pig airways. We used as antagonists BQ-123 and FR139317 (ETA receptor-selective) and PD 145065 (ETA/ETB receptor non-selective). 2. ET-1 and IRL 1620 (10(-10) M to 10(-6) M) caused similar concentration-dependent contractions of strips of guinea-pig trachea and upper bronchus. In the guinea-pig trachea without epithelium or lung parenchyma, IRL 1620 was less potent than ET-1. 3. In the trachea, contraction to ET-1 (< 10(-8) M) was preceded by a transient relaxation which was inhibited by BQ-123 (10(-5) M) or FR 139317 (10(-5) M) or by the removal of the epithelium. The concentration-response curve to ET-1 in the trachea was shifted to the right by PD 145065 (10(-5) M to 10(-4) M). PD 145065 (10(-4) M) also inhibited the response to ET-1 (3 x 10(-7) M) by 55%. Contractions induced by IRL 1620 were not affected by BQ-123 (10(-6) M) or FR139317 (10(-6) M) but were significantly attenuated by 10(-5) M of either antagonist. PD 145065 at 10(-6) M strongly attenuated and at 10(-5) M abolished contractions induced by IRL 1620.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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