Anandamide reduces infarct size in rat isolated hearts subjected to ischaemia-reperfusion by a novel cannabinoid mechanism
| Autor: | Nichola J, Underdown, C Robin, Hiley, William R, Ford |
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| Rok vydání: | 2005 |
| Předmět: |
Male
Polyunsaturated Alkamides Myocardial Infarction Blood Pressure Heart Arachidonic Acids In Vitro Techniques Rats Perfusion Coronary Circulation Reperfusion Injury Cannabinoid Receptor Modulators Papers Ventricular Pressure Animals lipids (amino acids peptides and proteins) Dimethyl Sulfoxide Rats Wistar Endocannabinoids |
| Zdroj: | British journal of pharmacology. 146(6) |
| ISSN: | 0007-1188 |
| Popis: | Although the endocannabinoids 2-arachidonoylglycerol (2-AG) and anandamide share a similar pharmacology, 2-AG reportedly limits myocardial ischaemia-reperfusion injury whereas anandamide does not. We therefore investigated whether or not anandamide reduces infarct size and which, if any, of the known cannabinoid-signalling pathways are involved. Rat isolated perfused hearts were subjected to global, no-flow ischaemia (30 min) and reperfusion (1 h). Agonists were present from 5 min before ischaemia until the end of reperfusion. Antagonists, where used, were present throughout the protocol. Recovery of left ventricular developed pressure and coronary flow was incomplete in control hearts and not significantly affected by any drug treatment. In vehicle-treated hearts, 26+/-3% (n=13) of the left ventricle was infarcted at the end of reperfusion. Infarction of the left ventricle was significantly reduced after 1 microM anandamide (10+/-1%, n=7) or 1 microM methanandamide (12+/-4%, n=6) but not 1 microM HU210. Neither ACPA (1 microM; CB1 receptor agonist) nor JWH133 (1 microM; CB2 receptor agonist), individually or combined significantly affected infarct size. Anandamide (1 microM) did not reduce infarct size in the presence of the CB1 receptor antagonist rimonabant (SR141716A, 1 microM) or the CB2 receptor antagonist, SR144528 (1 microM). Despite sensitivity to CB1 and CB2 receptor antagonists, the infarct-limiting action of anandamide was not mimicked by agonists selective for CB1 or CB2 receptors suggesting the involvement of a novel cannabinoid site of action. |
| Databáze: | OpenAIRE |
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