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Synthesis of lipoxygenase and epoxygenase products of arachidonic acid by normal and stenosed canine coronary arteries. Circ Res 1990 Mar;66(3):608-21 PMID: 2106399

Pubmed ID

2106399

Abstract

Coronary vascular injury promotes blood cell-vessel wall interactions that influence arachidonic acid metabolism and coronary blood flow patterns. Since lipoxygenase and cytochrome P-450 epoxygenase metabolites of arachidonic acid are synthesized by vascular and inflammatory cells and have a variety of important biological actions, we investigated the metabolism of arachidonic acid by these pathways in normal and stenosed, endothelially injured canine coronary arteries. We found and confirmed by gas chromatography/mass spectrometry that primarily 12- and 15-hydroxyeicosatetraenoic acids (HETEs) are synthesized by both coronary artery segments. Lesser amounts of 11-, 9-, 8-, and 5-HETEs are also produced. 15-Ketoeicosatetraenoic acid is also synthesized. The synthesis of 14C-HETEs is fivefold to 10-fold greater by the stenosed than the normal coronary artery. Specific radioimmunoassays indicated that the stenosed coronary artery synthesized 93 +/- 14 and 1,102 +/- 154 ng/g of tissue of 15- and 12-HETE, respectively, while the normal coronary artery produced 17 +/- 3 and 162 +/- 68 ng/g of tissue of 15- and 12-HETE, respectively. Products comigrating with 14,15-; 11,12-; 8,9-; and 5,6-epoxyeicosatrienoic acids (EETs) and the corresponding dihydroxyeicosatrienoic acids (DHETs) were detected predominantly in stenosed coronary arteries by high-pressure liquid chromatography. The structures of the EETs were confirmed by GC/MS. The EETs and prostaglandin I2 produced endothelium-independent, concentration-related relaxations of dog coronary artery rings. These data indicate that normal and stenotic coronary arteries metabolize arachidonic acid to HETEs, DHETs, and EETs along with prostaglandins; however, the synthesis of these metabolites is greater in the stenosed, endothelially injured vessel. The EETs may be synthesized during the development of cyclic flow variations and counteract the vasoconstrictor effects of thromboxane A2.

Author List

Rosolowsky M, Falck JR, Willerson JT, Campbell WB

Author

William B. Campbell PhD Chair, Professor in the Pharmacology and Toxicology department at Medical College of Wisconsin




Scopus

2-s2.0-0025215845   99 Citations

MESH terms used to index this publication - Major topics in bold

8,11,14-Eicosatrienoic Acid
Animals
Arachidonic Acid
Arachidonic Acids
Constriction, Pathologic
Coronary Disease
Coronary Vessels
Cytochrome P-450 Enzyme System
Dogs
Hydroxyeicosatetraenoic Acids
Lipoxygenase
Oxygenases
Prostaglandins
Reference Values
jenkins-FCD Prod-353 9ccd8489072cb19f5b9f808bb23ed672c582f41e