Cannabinoid CB1 receptor and endothelium-dependent hyperpolarization in guinea-pig carotid, rat mesenteric and porcine coronary arteries

British Journal of Pharmacology
T ChataigneauP M Vanhoutte

Abstract

1. The purpose of these experiments was to determine whether or not the endothelium-dependent hyperpolarizations of the vascular smooth muscle cells (observed in the presence of inhibitors of nitric oxide synthase and cyclo-oxygenase) can be attributed to the production of an endogenous cannabinoid. 2. Membrane potential was recorded in the guinea-pig carotid, rat mesenteric and porcine coronary arteries by intracellular microelectrodes. 3. In the rat mesenteric artery, the cannabinoid receptor antagonist, SR 141716 (1 microM), did not modify either the resting membrane potential of smooth muscle cells or the endothelium-dependent hyperpolarization induced by acetylcholine (1 microM) (17.3 +/- 1.8 mV, n = 4 and 17.8 +/- 2.6 mV, n = 4, in control and presence of SR 141716, respectively). Anandamide (30 microM) induced a hyperpolarization of the smooth muscle cells (12.6 +/- 1.4 mV, n = 13 and 2.0 +/- 3.0 mV, n = 6 in vessels with and without endothelium, respectively) which could not be repeated in the same tissue, whereas acetylcholine was still able to hyperpolarize the preparation. The hyperpolarization induced by anandamide was not significantly influenced by SR 141716 (1 microM). HU-210 (30 microM), a synthetic CB1 receptor...Continue Reading

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