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Title: Effect of amlodipine pretreatment on ischaemia-reperfusion-induced increase in cardiac endothelin-1 binding site density.
Austin Authors: Nayler, W G;Ou, R C;Gu, X H;Casley, David J
Affiliation: Department of Medicine, University of Melbourne, Austin Hospital, Heidelberg, Victoria, Australia
Issue Date: 1-Sep-1992
Publication information: Journal of Cardiovascular Pharmacology; 20(3): 416-20
Abstract: Endothelin-1 (ET-1) may be implicated in the pathophysiology of myocardial ischaemia. To determine whether the long-acting calcium antagonist amlodipine attenuates the ischaemia- and reperfusion-induced increase in cardiac ET-1 binding sites, hearts from rats pretreated with amlodipine (0.25 or 0.5 mg/kg) 2 or 5 h before they were killed were made ischaemic for 20 or 40 min, reperfused, and subfractionated. Twenty- and 40-min ischaemia caused a time-dependent increase in ET-1 binding site density (Bmax) identified with [125I]ET-1. Amlodipine pretreatment attenuated this increase in a time- and dose-dependent manner. 0.25 and 0.5 mg/kg amlodipine also suppressed the reperfusion-induced increase in [125I]ET-1 binding site density, even when the 0.5-mg/kg pretreatment series reperfusion was administered after 40-min ischaemia.
Gov't Doc #: 1279286
Journal: Journal of Cardiovascular Pharmacology
Type: Journal Article
Subjects: Amlodipine.pharmacology
Calcium Channel Blockers.pharmacology
In Vitro Techniques
Myocardial Reperfusion Injury.metabolism
Rats, Inbred WKY
Receptors, Endothelin.drug effects.metabolism
Appears in Collections:Journal articles

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