Threshold concentrations of endothelin-1 potentiate contractions to norepinephrine and serotonin in human arteries. A new mechanism of vasospasm?

Details

Serval ID
serval:BIB_15F65E2CEABE
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Threshold concentrations of endothelin-1 potentiate contractions to norepinephrine and serotonin in human arteries. A new mechanism of vasospasm?
Journal
Circulation
Author(s)
Yang  Z. H., Richard  V., von Segesser  L., Bauer  E., Stulz  P., Turina  M., Luscher  T. F.
ISSN
0009-7322
Publication state
Published
Issued date
07/1990
Peer-reviewed
Oui
Volume
82
Number
1
Pages
188-95
Notes
Journal Article
Research Support, Non-U.S. Gov't --- Old month value: Jul
Abstract
Endothelin-1 is an endothelium-derived vasoconstrictor peptide. Its circulating levels are below those known to evoke direct vascular effects. To study whether low concentrations of endothelin-1 potentiate the effects of other vasoconstrictor hormones, we suspended isolated human internal mammary and left anterior descending coronary artery rings in organ chambers for isometric tension recording. In mammary artery rings, the contractions to norepinephrine (3 x 10(-8) M) were potentiated by threshold (3 x 10(-10) M) and low concentrations (10(-9) M) of endothelin-1 (96 +/- 35% and 149 +/- 58% increase from control; p less than 0.01 and 0.001; n = 6). The inhibitor of endothelial nitric oxide formation L-NG-monomethyl arginine did not affect the potentiating effects of the peptide. The calcium antagonist darodipine (10(-7) M) prevented the potentiation of the response to norepinephrine evoked by endothelin-1. Similarly, contractions to serotonin (10(-7) or 3 x 10(-8) M) were amplified by endothelin-1 (3 x 10(-10) M) in the mammary (30 +/- 9%) and in the coronary arteries (59 +/- 25%). Endothelin-1 (10(-9) M) further potentiated the response (57 +/- 23% in mammary and 87 +/- 26% in coronary arteries; p less than 0.05; n = 7 and 3). The sensitivity of mammary arteries to calcium chloride was markedly enhanced in the presence of endothelin-1 (3 x 10(-10) M; concentration shift, eightfold; p less than 0.01; n = 5).(ABSTRACT TRUNCATED AT 250 WORDS)
Keywords
Arteries/*drug effects Biomechanics Calcium/pharmacology Differential Threshold Drug Synergism Endothelins Endothelium, Vascular/metabolism Humans Norepinephrine/*pharmacology Osmolar Concentration Peptides/*pharmacology Serotonin/pharmacology *Vasoconstriction
Pubmed
Web of science
Create date
14/02/2008 14:17
Last modification date
20/08/2019 12:45
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