Endothelin-1-induced contraction in isolated aortae from normotensive and DOCA-salt hypertensive rats: effect of magnesium

British Journal of Pharmacology
P Laurant, A Berthelot

Abstract

1. The contractile responses to endothelin-1 and the effect on these of various magnesium concentrations, were studied in isolated aortic rings from normotensive Sprague-Dawley rats and deoxycorticosterone acetate-salt (DOCA-salt) hypertensive rats. 2. Contractions induced by endothelin-1 were smaller in endothelium-denuded aortae from DOCA-salt hypertensive rats than in those from normotensive rats. The absence of calcium in the medium attenuated endothelin-1-induced contractions of aortae from both normotensive and DOCA-salt rats, but the contraction was greater in aortae from DOCA-salt hypertensive rats. Ryanodine (which inhibits the release of intracellular calcium) inhibited endothelin-1-induced contractions in aortae from DOCA-salt hypertensive rats to a greater extent than in aortae from normotensive rats. 3. A high extracellular magnesium concentration (4.8 mM) attenuated endothelin-1-induced contractions in tissues from DOCA-salt hypertensive rats but not in tissues from normotensive rats. In the absence of calcium, a high concentration of magnesium attenuated endothelin-1-induced contraction in aortae from both normotensive and hypertensive rats. In the presence of ryanodine, a high concentration of magnesium did not ...Continue Reading

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