on February 7, 2005
Published online before print February 7, 2005, doi: 10.1161/01.HYP.0000153462.06604.5d
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Submitted on October 11, 2004
From the Department of Pharmacology and Toxicology (K.M.G., E.M.E., W.B.C.), Medical College of Wisconsin, Milwaukee; and the Department of Biochemistry (J.R.F., D.S.R.), University of Texas Southwestern Medical School, Dallas. * To whom correspondence should be addressed. E-mail: kgauth{at}mcw.edu.
Abstract--Bradykinin causes arterial relaxation and hyperpolarization, which is mediated by a transferable endothelium-derived hyperpolarizing factor (EDHF). In coronary arteries, epoxyeicosatrienoic acids (EETs) are involved in the EDHF response. However, the role of EETs as transferable mediators of EDHF-dependent relaxation remains poorly defined. Two small bovine coronary arteries were cannulated and perfused in tandem in the presence of the nitric oxide synthase inhibitor, nitro-L-arginine (30 µmol/L), and the cyclooxygenase inhibitor, indomethacin (10 µmol/L). Luminal perfusate from donor arteries with intact endothelium perfused endothelium-denuded detector arteries. Detector arteries were constricted with U46619 and diameters were monitored. Bradykinin (10 nmol/L) added to detector arteries did not induce dilation (5±2%), whereas bradykinin addition to donor arteries dilated detector arteries by 26.5±7% (P<0.05). These dilations were blocked by donor artery endothelium removal and detector artery treatment with the EET-selective antagonist, 14,15-epoxyeicosa-5(Z)-monoenoic acid (14,15-EEZE; 10 µmol/L, -5±6%) but not 14,15-EEZE treatment of donor arteries (20±5%). 14,15-EET (0.1 to 10 µmol/L) added to detector arteries induced maximal dilations of 82±5% that were inhibited 50% by detector artery treatment with 14,15-EEZE (32±12%) but not donor artery treatment with 14,15-EEZE. Liquid chromatography-electrospray ionization mass spectrometry analysis verified the presence of 14,15-EET in the perfusate from an endothelium-intact but not denuded artery. These results show that bradykinin stimulates donor artery 14,15-EET release that dilates detector arteries. 14,15-EEZE blocked the donor artery, endothelium-dependent, bradykinin-induced relaxations, and attenuated relaxations to 14,15-EET. These results suggest that EETs are transferable EDHFs in coronary arteries.
Revised on October 26, 2004
14,15-Epoxyeicosatrienoic Acid Represents a Transferable Endothelium-Dependent Relaxing Factor in Bovine Coronary Arteries
Kathryn M. Gauthier*;
Key words: bradykinin • endothelium-derived factors • vasodilation
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