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PMID: 9826706 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S.

Endothelin ETA receptor blockade restores NO-mediated endothelial function and inhibits atherosclerosis in apolipoprotein E-deficient mice.

Barton M, Haudenschild CC, d'Uscio LV, Shaw S, Münter K, Lüscher TF

Abstract

This study investigated whether endothelin-1 (ET-1), a potent vasoconstrictor, which also stimulates cell proliferation, contributes to endothelial dysfunction and atherosclerosis. Apolipoprotein E (apoE)-deficient mice and C57BL/6 control mice were treated with a Western-type diet to accelerate atherosclerosis with or without ETA receptor antagonist LU135252 (50 mg/kg/d) for 30 wk. Systolic blood pressure, plasma lipid profile, and plasma nitrate levels were determined. In the aorta, NO-mediated endothelium-dependent relaxation, atheroma formation, ET receptor-binding capacity, and vascular ET-1 protein content were assessed. In apoE-deficient but not C57BL/6 mice, severe atherosclerosis developed within 30 wk. Aortic ET-1 protein content (P < 0.0001) and binding capacity for ETA receptors was increased as compared with C57BL/6 mice. In contrast, NO-mediated, endothelium-dependent relaxation to acetylcholine (56 +/- 3 vs. 99 +/- 2%, P < 0.0001) and plasma nitrate were reduced (57.9 +/- 4 vs. 93 +/- 10 micromol/liter, P < 0.01). Treatment with the ETA receptor antagonist LU135252 for 30 wk had no effect on the lipid profile or systolic blood pressure in apoE-deficient mice, but increased NO-mediated endothelium-dependent relaxation (from 56 +/- 3 to 93 +/- 2%, P < 0.0001 vs. untreated) as well as circulating nitrate levels (from 57.9 +/- 4 to 80 +/- 8.3 micromol/liter, P < 0.05). Chronic ETA receptor blockade reduced elevated tissue ET-1 levels comparable with those found in C57BL/6 mice and inhibited atherosclerosis in the aorta by 31% without affecting plaque morphology or ET receptor-binding capacity. Thus, chronic ETA receptor blockade normalizes NO-mediated endothelial dysfunction and reduces atheroma formation independent of plasma cholesterol and blood pressure in a mouse model of human atherosclerosis. ETA receptor blockade may have therapeutic potential in patients with atherosclerosis.

MeSH Terms
Acetylcholine/pharmacology Animals Aorta, Thoracic/drug effects,pathology,physiopathology Apolipoproteins E/deficiency Arteriosclerosis/pathology,physiopathology,prevention & control Blood Pressure/drug effects Cholesterol/blood Diet Endothelin Receptor Antagonists Endothelin-1/blood,pharmacology,physiology Endothelium, Vascular/drug effects,physiology,physiopathology Humans In Vitro Techniques Lipoproteins/blood Male Mice Mice, Inbred C57BL Mice, Mutant Strains Muscle, Smooth, Vascular/drug effects,pathology,physiopathology Nitric Oxide/physiology Nitroprusside/pharmacology Norepinephrine/pharmacology Phenylpropionates/pharmacology Pyrimidines/pharmacology Receptor, Endothelin A Species Specificity Systole Triglycerides/blood Vasodilation/drug effects
Chemicals
Apolipoproteins E Endothelin Receptor Antagonists Endothelin-1 Lipoproteins Phenylpropionates Pyrimidines Receptor, Endothelin A Triglycerides Nitroprusside Nitric Oxide darusentan Cholesterol Acetylcholine Norepinephrine
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Barton M
Cardiology, University Hospital Zürich and Cardiovascular Research Laboratory, Institute of Physiology, University of Zürich, CH-8091 Zurich, Switzerland.
Haudenschild C C
d'Uscio L V
Shaw S
Münter K
Lüscher T F
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
Published
1998-11-24
Pages
14367-72
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC24379
Subset
IM
Grants
NHLBI NIH HHS · R01-HL-54246 · United States
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