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Release of secondary free radicals during post-ischaemic reperfusion is not influenced by extracellular calcium levels in isolated rat hearts

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Abstract

In this study, we evaluated the impact of the calcium concentration present in the perfusion medium (1.2–3 mM) on contractile performance, lactate dehydrogenase (LDH) release and secondary free radical production during post-ischaemic reperfusion of isolated rat hearts. The impact of calcium concentration on post-ischaemic free radical release was investigated using the Electron Paramagnetic Resonance (EPR) technique and spin trapping with the lipophilic spin trap alpha-phenyl N-tert-butylnitrone (PBN). The evolution of left ventricular end diastolic pressure (LVEDP) in both groups followed the same pattern, but we observed that ischaemic and post-ischaemic contracture was more severe in the group of hearts perfused with 3 mM of calcium as compared with those perfused with 1.2 mM of calcium. A large release of alkyl/alkoxyl species occurred in all hearts from the onset of reperfusion and remained at a high level during the 30 min of reperfusion with no return to basal values. The kinetics and intensity of these releases were the same in both groups. In conclusion, in a range of extracellular calcium levels (1.2–3 mM), the release of alkyl/alkoxyls radicals does not seem to be calcium-dependent. Due to the protective actions of PBN itself, the results of simultaneous investigations of the effects of radical scavengers on isolated heart function may be limited. However, since many pharmacological properties (antioxidant, cellular protector, NO precursor ...) are attributed to PBN, studies investigating oxidative stress with such a multi-faceted tool make interpretation difficult.

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Acknowledgments

This work was supported by grants from the Conseil Régional de Bourgogne, France, Fondation de France, Fondation pour la Recherche Médicale. We would like to thank Philip Bastable for English proof reading.

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  1. Laboratoire de Physiopathologie et Pharmacologie Cardiovasculaires Expérimentales (LPPCE), Facultés de Médecine et de Pharmacie, 7 Bd Jeanne d’Arc, BP 87900, 21079, Dijon Cedex, France

    C. Perrin-Sarrado, O. Bouchot, C. Vergely & L. Rochette

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  1. C. Perrin-Sarrado
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  2. O. Bouchot
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  3. C. Vergely
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  4. L. Rochette
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Correspondence to L. Rochette.

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Perrin-Sarrado, C., Bouchot, O., Vergely, C. et al. Release of secondary free radicals during post-ischaemic reperfusion is not influenced by extracellular calcium levels in isolated rat hearts. Mol Cell Biochem 297, 199–207 (2007). https://doi.org/10.1007/s11010-006-9347-8

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  • DOI: https://doi.org/10.1007/s11010-006-9347-8

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