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. 1995 Apr;114(8):1529–1540. doi: 10.1111/j.1476-5381.1995.tb14936.x

Pharmacological evidence for the presence of three distinct functional endothelin receptor subtypes in the rabbit lateral saphenous vein.

S A Douglas 1, G R Beck Jr 1, J D Elliott 1, E H Ohlstein 1
PMCID: PMC1510370  PMID: 7599920

Abstract

1. Contraction of the rabbit isolated saphenous vein is mediated by a heterogeneous endothelin (ET) receptor population. This study has characterized these receptor subtypes by use of several pharmacologically distinct ET receptor agonists and antagonists. 2. ET-1, ET-3, sarafotoxin S6c (STXc) and [Ala3,11]ET-1 produced biphasic, concentration-dependent contractions of the saphenous vein, responses which were best fitted by a two-site model comprised of a high (pM) and a low (nM) affinity site. In contrast, IRL 1620 only recognized one of these sites. ET(16-21) was devoid of contractile activity. ET-1, ET-3 and STXc were equipotent at the high affinity site (pD2s of 12.0 +/- 0.2, 12.2 +/- 0.2 and 12.3 +/- 0.3) indicating that this site had the characteristics of an ETB receptor. In contrast, the low affinity site had the functional characteristics of an ETc receptor since the pD2s for ET-3 (10.2 +/- 0.3) and STXc (10.6 +/- 0.3) were significantly greater than that for ET-1 (9.1 +/- 0.1). These contractile responses were insensitive to BQ-123, confirming that ETA receptors were not involved in mediating this effect. 3. SB 209670 differentially antagonized the high affinity phases of the isopeptide concentration-response curves in a fashion dependent on the competing agonist: relative to the KB obtained against STXc (0.15 nM). SB 209670 was 10 fold less potent when ET-1 was used as the competing agonist. This differential effect was not evident at the low affinity site (KB = 38 nM). SB 209670 produced parallel, concentration-dependent rightward shifts in the concentration-response curve to STXc Ro 47-0203 was approximately 1 to 2 orders of magnitude less potent than SB 209670 at inhibiting the high affinity component of the concentration-response curve to STXc, whereas BQ-788 and Ro 46-2005 were approximately 3 orders of magnitude less potent than SB 209670. In addition to RES-701 and BQ-123, the high affinity site was insensitive to PD 142893 suggesting that it may represent an ETB2 receptor. Ro 47-0203 and SB 209670 were equipotent at inhibiting the low affinity component of the STXc concentration-response curve. Although Ro 46-2005, BQ-788, PD 142893 and RES-701 produced significant antagonism at the low affinity site, they were at least ten fold less potent than SB 209670.(ABSTRACT TRUNCATED AT 400 WORDS)

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Selected References

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