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Comparative effects of calcium and potassium channel modulators on ischemia/reperfusion injury in the isolated rat heart

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Abstract

The aim of this study was to examine and compare the effects of the acute administration of verapamil or amlodipine as representatives of the calcium channel blockers or nicorandil as a representative of the mitochondrial ATP-dependent potassium (KATP) channel opener to cardiac contractility, coronary flow, and oxidative stress markers on ischemia/reperfusion injury in the isolated rat heart. The hearts of adult male Wistar albino rats (n = 60 total, 12 per group) were divided into five groups, two controls (preconditioning with Krebs–Henseleit solution) and three experimental depending on acute administrated pharmacological agents (0,63 µmol/L of verapamil, 0,1 µmol/L of amlodipine, and 200 µmol/L of nicorandil). After stabilization and 5 min of preconditioning in experimental groups, hearts from I/R control and all experimental groups underwent global ischemia (20 min) and reperfusion (30 min). Hearts from sham group were continuously followed for 50 min, after stabilization period. Cardiodynamic parameters and coronary flow were recorded at the end of stabilization (S), at the last minute of pharmacological preconditioning (P) and at intervals of 5 min after global ischemia, during reperfusion, or in case of sham group during 20–50 min after stabilization. At the same intervals, we collected coronary venous effluent from which we spectrophotometrically measured the parameters of oxidative stress: the index of lipid peroxidation, superoxide anion radical, hydrogen peroxide, and nitrite. In summary, our findings clearly indicate that the blocking of the calcium channel or the activation of KATP may mediate the protective effect of myocardial preconditioning. The ex vivo results showed that all examined drugs after ischemia and reperfusion have beneficial cardioprotective properties associated with lower values of major pro-oxidative molecules. Obtained effects seem to be the most convincible in case of nicorandil.

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Authors and Affiliations

  1. Health Center ”Vozdovac”, Belgrade, Serbia

    Nina Simonovic

  2. Department of Physiology, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia

    Vladimir Jakovljevic, Ivan Srejovic & Vladimir Zivkovic

  3. Department of Human Pathology, 1st Moscow State Medical University IM Sechenov, Moscow, Russia

    Vladimir Jakovljevic

  4. Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia

    Jovana Jeremic, Tamara Nikolic Turnic & Isidora Milosavljevic

  5. Department of Physiology, Medical Faculty, University of Ljubljana, Ljubljana, Slovenia

    Zarko Finderle

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  1. Nina Simonovic
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  2. Vladimir Jakovljevic
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  3. Jovana Jeremic
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Correspondence to Vladimir Jakovljevic.

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Simonovic, N., Jakovljevic, V., Jeremic, J. et al. Comparative effects of calcium and potassium channel modulators on ischemia/reperfusion injury in the isolated rat heart. Mol Cell Biochem 450, 175–185 (2019). https://doi.org/10.1007/s11010-018-3384-y

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