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Mechanisms of elevated plasma endothelin-1 in CHF: congestion increases pulmonary synthesis and secretion of endothelin-1.

Abstract：

OBJECTIVE:The pulmonary circulation may contribute to elevated plasma levels of endothelin-1 (ET-1) in congestive heart failure (CHF). The aims of the present study were to determine the mechanisms of increased secretion of ET-1 from the pulmonary circulation in CHF. METHODS:Juvenile pigs were subjected to sham operation (n=9) or rapid cardiac pacing-induced CHF (215-240 bpm, n=15). RESULTS:Three weeks of rapid pacing led to significant left ventricular dilatation, increased cardiac filling pressures, and reduced contractility (CHF pigs). Arterial plasma ET-1 levels in the CHF pigs were increased 4-fold compared to sham pigs (P<0.001). Single-bolus multiple indicator-dilution experiments revealed that pulmonary synthesis and release of ET-1 was increased in CHF, while pulmonary clearance of plasma ET-1 remained unaltered despite significant reduction of pulmonary fractional extraction of plasma ET-1. Pulmonary ECE-1 isozyme activity (pmol.min-1.mg protein-1) was selectively increased in lower lobe segments of CHF pigs (2.0+/-0.3) compared to lower lobe segments of controls (1.1+/-0.1, P<0.02), and to upper lobe segments of CHF pigs (1.1+/-0.1, P<0.005), and correlated significantly with the wet/dry weight ratios of the pulmonary tissue samples (R=0.75, P<0.001), i.e. a marker of pulmonary congestion. Furthermore, alveolar macrophages in congested lobe segments were identified as likely sites of increased synthesis and release of ET-1. CONCLUSIONS:In rapid pacing-induced CHF, a complex cardiopulmonary interaction revealed by pulmonary congestion causes increased pulmonary production and secretion of ET-1 due to enhanced pulmonary ECE-1 activities. Pulmonary secretion of ET-1 during evolving CHF is an important contributor to elevated plasma ET-1 levels in the systemic circulation.

journal_name

Cardiovasc Res

journal_title

Cardiovascular research

authors

von Lueder TG,Kjekshus H,Edvardsen T,ØIe E,Urheim S,Vinge LE,Ahmed MS,Smiseth OA,Attramadal H

doi

10.1016/j.cardiores.2004.03.016

subject

Has Abstract

pub_date

2004-07-01 00:00:00

pages

41-50

issue

eissn

0008-6363

issn

1755-3245

pii

S0008636304001324

journal_volume

pub_type

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Mechanisms of elevated plasma endothelin-1 in CHF: congestion increases pulmonary synthesis and secretion of endothelin-1.