Anti-infarct effect of magnesium is not mediated by adenosine A1 receptors in rat globally ischaemic isolated hearts

Ebrahimi, S. and Faghihi, M. and Keshavarz, M. and Kadkhodaee, M. and Mirershadi, F. and Asadi, B. (2004) Anti-infarct effect of magnesium is not mediated by adenosine A1 receptors in rat globally ischaemic isolated hearts. Clinical and Experimental Pharmacology and Physiology, 31 (12). pp. 868-872.

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Abstract

1. The aim of present study was to investigate the effects of magnesium (Mg) on cardiac function and infarct size and to compare it effects with those of adenosine. The mechanism of Mg-mediated cardioprotection was explored by combined use of Mg and a selective adenosine A1 receptor antagonist. 2. Rat isolated hearts were used for Langendorff perfusion. Hearts were either non-preconditioned or preconditioned with Mg (6 mmol/L) or adenosine (1 mmol/L) before 30 min sustained ischaemia followed by 120 min reperfusion. Within each of these protocols, hearts were divided into two groups; one group was exposed to the A1 receptor antagonist 8-cyclopentyl-1,3-dipropylxanthine (DPCPX; 200 nmol/L). Infarct size was measured by the triphenyltetrazolium chloride method. Left ventricular function was assessed by left ventricular developed pressure (LVDP), the product of heart rate x LVDP and coronary flow (CF). 3. The administration of Mg had an anti-infarct effect independent of its effect on postischaemic functional recovery in rats. Both Mg and adenosine equipotently reduced infarct size, but this effect of Mg was not blocked by the simultaneous administration of DPCPX. Cardiac function was improved by both adenosine and Mg and blockade of adenosine A1 receptors attenuated these effects for both agents. 4. In conclusion, the results of the present study indicate that stimulation of adenosine A1 receptors is not responsible for the anti-infarct effect of Mg in ischaemic myocardium in rats, but that the Mg-mediated protection of postischaemic functional recovery in rats is mediated by these receptors.

Item Type: Article
Additional Information: cited By 6
Uncontrolled Keywords: 8 cyclopentyl 1,3 dipropylxanthine; adenosine; adenosine A1 receptor; magnesium; triphenyltetrazolium, animal experiment; animal model; animal tissue; article; controlled study; coronary artery blood flow; drug effect; drug mechanism; heart function; heart infarction; heart infarction size; heart left ventricle function; heart left ventricle pressure; heart muscle ischemia; heart perfusion; heart protection; heart rate; isolated heart; male; nonhuman; rat, Animals; Cardiotonic Agents; Magnesium; Male; Myocardial Ischemia; Rats; Rats, Wistar; Receptor, Adenosine A1
Depositing User: EPrints System Admin
Date Deposited: 19 Jul 2017 10:13
Last Modified: 19 Jul 2017 10:13
URI: http://eprints.iums.ac.ir/id/eprint/58

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