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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Collins, P. Jiang, C. W. Poole-wilson, P. A. Sarrel, P. M. Lindsay, D. C. |
| Description | Author Affiliation: Jiang CW ( Department of Cardiac Medicine, National Heart and Lung Institute, University of London.) |
| Abstract | 1. We assessed the relaxant effect of 17 beta-oestradiol (10(-7), 10(-6) and 10(-5) M) on rabbit isolated coronary arteries precontracted with prostaglandin F2 alpha (3 x 10(-6) M), high extracellular potassium (30 mM) and Bay K 8644 (10(-6) M) plus high extracellular potassium (15 mM) by measuring isometric tension. 17 beta-Oestradiol (10(-6) and 10(-5) M) induced significant relaxation in coronary arteries from male and female rabbits. No differences were seen between arteries with or without endothelium. There were also no differences between coronary arteries isolated from male and female rabbits. 2. Inhibitors of endothelium-derived relaxing factor and vasodilator prostanoids, namely, reduced haemoglobin, N omega-nitro-L-arginine methyl ester and indomethacin, did not affect the relaxation induced by 17 beta-oestradiol in endothelium-intact coronary arteries. 3. Methylene blue, an inhibitor of guanylate cyclase, did not affect the coronary artery relaxation induced by 17 beta-oestradiol. 4. The calcium concentration-dependent contraction curve in potassium-depolarization medium was shifted to the right by 17 beta-oestradiol (10(-6) and 10(-5) M) in the rabbit coronary artery and rat aorta. The -log EC50s of calcium in control and after incubation with 17 beta-oestradiol (10(-6) and 10(-5) M) were 3.7 +/- 0.09, 3.1 +/- 0.10 and 2.8 +/- 0.08 respectively in rabbit coronary arteries and 3.8 +/- 0.11, 3.3 +/- 0.14 and 2.9 +/- 0.15 in rat aorta. 5. The results indicate that 17 beta-oestradiol induces rabbit coronary artery relaxation by an endothelium-independent mechanism in vitro. A calcium antagonistic property may be involved in the mechanism of rabbit coronary arterial relaxation by 17beta-oestradiol. |
| ISSN | 00071188 |
| e-ISSN | 14765381 |
| Journal | British Journal of Pharmacology |
| Issue Number | 4 |
| Volume Number | 104 |
| Language | English |
| Publisher | Wiley Online Library(on behalf of The British Pharmacological Society) |
| Publisher Date | 1991-12-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Open |
| Subject Keyword | Coronary Vessels Drug Effects Endothelium, Vascular Physiology Estradiol Pharmacology Muscle, Smooth, Vascular Animals Aorta, Thoracic Arginine Analogs & Derivatives Calcium Channel Blockers Hemoglobins In Vitro Techniques Indomethacin Methylene Blue Muscle Relaxation NG-Nitroarginine Methyl Ester Nitric Oxide Antagonists & Inhibitors Pregnancy Rabbits Rats, Inbred Strains |
| Content Type | Text |
| Resource Type | Article |
| Subject | Pharmacology |
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