Binding of a new bioactive 31-amino-acid endothelin-1 to an endothelin ET(B) or ET(B)-like receptor in porcine lungs.

Abstract:

:Endothelin-1-(1-31) is a new bioactive 31-amino-acid-length peptide generated from big endothelin-1 by chymase or other chymotrypsin-type proteases with various pathophysiologic functions. In this study, we have detected the specific and monophasic binding of [125I]endothelin-1-(1-31) in porcine lung membranes. Competition studies of [125I]endothelin-1-(1-31) binding by unlabeled endothelin-1-(1-31), endothelin-1, endothelin-3, and antagonists and agonists of endothelin ET(A) and ET(B) receptors suggest that the binding protein is an endothelin ET(B) or ET(B)-like receptor rather than an endothelin ET(A) receptor in porcine lungs. Kinetic studies showed that the affinity of endothelin-1-(1-31) to its receptor was approximately one order of magnitude lower than that of endothelin-1, and that the specific binding of endothelin-1-(1-31) was about 19% of endothelin-1 binding. The binding of [125I]endothelin-1-(1-31) was extremely slow, slower even than that of endothelin-1, and nearly irreversible. This unique quasi-irreversibility may explain the slow-onset and long-lasting biologic effects of this peptide in vivo.

journal_name

Eur J Pharmacol

authors

Kitamura H,Cui P,Sharmin S,Yano M,Kido H

doi

10.1016/s0014-2999(03)01454-7

keywords:

subject

Has Abstract

pub_date

2003-03-28 00:00:00

pages

31-8

issue

1-2

eissn

0014-2999

issn

1879-0712

pii

S0014299903014547

journal_volume

465

pub_type

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