[3H]bosentan binding to human coronary artery: functional correlates.

Abstract:

:The binding characteristics and localization of bosentan, an orally active endothelin-1 (ET-1) antagonist, were studied on sections of human coronary artery by in vitro autoradiography. Competition studies were performed to determine the ability of bosentan to prevent [125I]ET-1 binding to the coronary vasculature. The effects of bosentan on ET-1-induced contraction of the coronary artery were also studied in vitro. [3H]Bosentan bound to the tunica media of the human coronary artery. Unlabeled bosentan prevented [125I]ET-1 binding to this vessel in a concentration-dependent manner, and functional studies indicated that bosentan antagonizes ET-1--induced constriction. These data show that bosentan is able to reduce ET-1 binding to the human coronary artery and ET-1 constrictor effects in vitro. Bosentan is an orally active ET-1 antagonist, and these results suggest that this compound might be used to block the effects of locally released ET-1 in pathologic conditions, such as atherosclerosis, angina, and myocardial ischemia.

journal_name

J Cardiovasc Pharmacol

authors

Dashwood MR,Timm M,Muddle JR,Shah D,Tippins JR,Kaski JC

subject

Has Abstract

pub_date

1995-01-01 00:00:00

pages

S376-9

eissn

0160-2446

issn

1533-4023

journal_volume

26 Suppl 3

pub_type

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