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Pharmacologic characterization of S-1255, a highly potent and orally active endothelin A receptor antagonist.

Abstract：

:The pharmacologic properties of a novel nonpeptide endothelin (ET) receptor antagonist, S-1255 ([R]-[+]-2-[benzo(1,3)dioxol-5-yl]-6-isopropyl-4-[4-methoxyphenyl]-2H-chromene-3-carboxylic acid), was studied. [3H]S-1255 specifically bound to porcine aortic smooth muscle membranes expressing only ET(A) receptors with a Kd value of 0.39 nM. [3H]S-1255 binding was potently inhibited by ET-1 and selective ET(A) or ET(A)/ET(B) receptor antagonists, such as L-749329, SB209670, bosentan, and BQ-123, but the inhibitory effect of ET-3 and the selective ET(B) receptor antagonist, BQ-788, on the binding was weak. These inhibitory effects on [3H]S-1255 binding correlated well with those on [125I]ET-1 binding. S-1255 inhibited ET(A) receptor- and ET(B) receptor-mediated contractions in isolated rabbit femoral and pulmonary arteries with pA2 values of 8.8 and 6.3, respectively. The pA2 value of S-1255 for ET(B) receptor-mediated relaxation in isolated rabbit mesenteric artery was 7.4. Oral administration of S-1255 (0.3-10 mg/kg) caused dose-dependent inhibition of the pressor response to exogenous ET-1 (0.1 nmol/kg) in conscious normotensive rats, which was similar to that produced by intravenous administration (1 and 3 mg/kg). S-1255 (10 and 30 mg/kg, p.o.) significantly reduced blood pressure in deoxycorticosterone acetate-salt hypertensive rats from 6 h after administration, and the hypotensive effects were sustained up to 24-48 h. These results suggest that S-1255 is a highly potent and orally active ET(A) receptor antagonist.

journal_name

J Cardiovasc Pharmacol

journal_title

Journal of cardiovascular pharmacology

authors

Iwasaki T,Mihara S,Shimamura T,Kawakami M,Masui M,Hayasaki-Kajiwara Y,Naya N,Ninomiya M,Fujimoto M,Nakajima M

doi

10.1097/00005344-200104000-00014

subject

Has Abstract

pub_date

2001-04-01 00:00:00

pages

471-82

issue

4

eissn

0160-2446

issn

1533-4023

journal_volume

37

pub_type

杂志文章

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