Mesripour, Azadeh and Iyer, Abishek and Brown, Lindsay (2012) Mineralocorticoid receptors mediate cardiac remodelling in morphine-dependent rats. Basic and Clinical Pharmacology and Toxicology, 111 (2). pp. 75-80. ISSN 1742-7835
Abstract
Acute morphine administration decreases cardiac responses to ischaemic injury. This project has determined whether
induction of morphine dependence in rats by gradually increasing morphine doses for 21 days induces structural and functional changes in the cardiovascular system because of mineralocorticoid receptor activation, as morphine increases plasma corticosterone concentrations. Morphine-dependent rats showed ventricular hypertrophy, increased collagen deposition in the left ventricle together with an increased ventricular stiffness and increased plasma malondialdehyde concentrations without changes in systolic
blood pressure or thoracic aortic responsiveness. These parameters were attenuated or normalised in morphine-dependent rats treated with spironolactone (50 mg/kg/day) from days 14–21. These results suggest that morphine dependence induces ventricular remodelling and increased oxidative stress that can be prevented by the mineralocorticoid receptor antagonist, spironolactone.
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