Acetylcholine stimulates release of endothelium-derived relaxing factor in coronary arteries of human organ donors.

Acetylcholine stimulates release of endothelium-derived relaxing factor in coronary arteries of human organ donors. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Acetylcholine stimulates release of endothelium-derived relaxing factor in coronary arteries of human organ donors. Abstract Text:

G A Blaise,D J Stewart,M J ,

OBJECTIVE: To determine whether cholinergic stimulation of human coronary endothelial cells induces the release of endothelium-derived relaxing factor (EDRF), denuded human coronary artery rings or denuded rabbit aorta rings were either directly perfused or superfused by the effluent of intact or denuded human coronary artery segments in a perfusion bioassay system. DESIGN: Coronary vessels were dissected from hearts of organ donors and prepared for use as donor segments and detector rings in the perfusion bioassay system. Segments were continuously perfused by an oxygenated Krebs-Ringer solution. Rings were suspended between two stirrups, one of which was connected to an isometric force transducer. They were either directly perfused (no tissue had been previously perfused by the same Krebs-Ringer) or superfused by the effluent of an endothelium-intact or -denuded coronary segment. Human rings were contracted with prostaglandin F2 alpha (2 x 10(-6) M) and rabbit rings were contracted with phenylephrine (10(-6) M). RESULTS: Tension in detector tissue did not change during superfusion with effluent from endothelium-denuded or -intact human coronary artery segments, showing that there was no basal release of EDRF/nitric oxide (NO) in this preparation. Acetylcholine (ACh) (10(-6) or 10(-5) M) added to the perfusate increased the tension of the precontracted endothelium-denuded human rings directly perfused (50 +/- 32%) but not of the precontracted rabbit rings, showing that ACh is a potent agonist of human coronary vascular smooth muscle. ACh added to the coronary segment in the endothelium-intact superfusion mode had no effect in 33% or induced a small relaxation (8.8 +/- 1.6%) in 66% of the preparations. Hemoglobin (10(-5) M), a scavenger of EDRF/NO, caused a further increase in tension (32 +/- 15%). Adding calcium ionophore (A 23187;10(-5) M), which stimulates EDRF/NO release through a nonreceptor-mediated mechanism, to the coronary artery segment induced a relaxation in the endothelium-perfused detector rings which did not relax to ACh (30 +/- 2%); this relaxation was reversed by methylene blue (10(-5) M), a blocker of soluble guanylate cyclase. NO endothelin, a potent vasoconstrictor released by the endothelial cells, was detected in the effluent of intact coronary vessels. CONCLUSION: The results suggest that in two-thirds of the six preparations studied, cholinergic stimulation can release EDRF from human donor coronary artery endothelial cells.

Acetylcholine stimulates release of endothelium-derived relaxing factor in coronary arteries of human organ donors. Publishing Authors By Initials

GA Blaise,DJ Stewart,MJ ,

For similar persons: tissue donors research abstracts see: persons: tissue donors research

PUBMED ID PMID:

MEDLINE DATE:

Acetylcholine stimulates release of endothelium-derived relaxing factor in coronary arteries of human organ donors. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The Canadian journal of cardiology

VOLUME: 9

Page Numbers: 813-20

Journal Abbreviation:

ISSN: 1916-7075

DAY: 3

MONTH: Nov

YEAR: 1993

Acetylcholine stimulates release of endothelium-derived relaxing factor in coronary arteries of human organ donors. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 8510280

Acetylcholine stimulates release of endothelium-derived relaxing factor in coronary arteries of human organ donors. Keywords Mesh Terms:

KEYWORDS: Tissue Donors

MESH TERMS: pharmacology

Chemical & Substance for Abstract: Acetylcholine stimulates release of endothelium-derived relaxing factor in coronary arteries of human organ donors. Information

Substance Name: Methylene Blue

Registry Number: 61-73-4

Grant and Affiliation Information for Acetylcholine stimulates release of endothelium-derived relaxing factor in coronary arteries of human organ donors.

AFFILIATION: Department of Anesthesiology, Hôpital Notre-Dame, Université de Montréal, Quebec.

Country: CANADA

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: Can J Cardiol

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Acetylcholine stimulates release of endothelium-derived relaxing factor in coronary arteries of human organ donors Related Publications

• Acetylcholine stimulates release of endothelium-derived relaxing factor in coronary arteries of human organ donors.
• [Not Available.]
• [Not Available.]