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Different pharmacological profiles of big-endothelin-3 and big-endothelin-1 in vivo and in vitro.

Abstract：

:1. Human big-endothelin-1 (big-ET-1) and endothelin-1 (ET-1) are equipotent as pressor agents and produce a significant change in mean arterial blood pressure (MAP) in anaesthetized guinea-pigs (2 nmol kg-1: peak delta MAP: 23 +/- 6 mmHg and 26 +/- 5 mmHg, respectively). 2. Unlike big-ET-1, big-endothelin-3 (big-ET-3) (10 and 20 nmol kg-1) induces no pressor responses whereas endothelin-3 (ET-3) at 2 nmol kg-1 induces a significant increase of blood pressure in anaesthetized guinea-pigs (peak delta MAP: 27 +/- 5 mmHg) with a shorter duration than ET-1 and big-ET-1. 3. Big-ET-1 at concentrations 40 times higher than those required for ET-1 (2.5 nM) releases prostacyclin (PGI2) (maximal release: 2.7 +/- 0.8 ng ml-1; 2.9 +/- 0.9 ng ml-1, respectively) and thromboxane B2 (TxB2) (maximal release: 6.7 +/- 1.3 ng ml-1; 6.8 +/- 1.1 ng ml-1, respectively) from guinea-pig perfused lungs. ET-3 (2.5 nM) is also a potent releaser of PGI2 and TxB2 from the guinea-pig lungs (maximal release: PGI2: 2.4 +/- 1.0 ng ml-1; TxB2: 3.8 +/- 0.6 ng ml-1). Conversely, big-ET-3 (100 nM) does not increase basal release of eicosanoids. 4. Phosphoramidon (50 microM), a metalloprotease inhibitor, markedly reduced the eicosanoid releasing properties of big-ET-1 (n = 4, P less than 0.01) in guinea-pig perfused lungs without affecting the release stimulated by ET-1. 5. Our results suggest that big-ET-1 is converted to ET-1 via a phosphoramidon-sensitive endothelin converting enzyme (ECE) to release eicosanoids. The ECE is present in the guinea-pig pulmonary vasculature. Furthermore, our results suggest that the ECE activity is specific for big-ET-1 and may not convert big-ET-3 to its active metabolite, ET-3.

journal_name

Br J Pharmacol

journal_title

British journal of pharmacology

authors

D'Orléans-Juste P,Télémaque S,Claing A

doi

10.1111/j.1476-5381.1991.tb12448.x

subject

Has Abstract

pub_date

1991-10-01 00:00:00

pages

440-4

issue

2

eissn

0007-1188

issn

1476-5381

journal_volume

104

pub_type

杂志文章

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