Summary
The aim of this work was to assess the catalytic activity of xanthine oxidase, the level of lipid peroxides and enzymic antioxidant systems in isolated rat heart muscle subjected to a globally partial ischemia followed by varying durations of reperfusion.
After 40 min of globally partial ischemia (residual perfusion flow rate: 0.1 ml/min), four different durations of reperfusion were investigated (0, 20, 40, and 60 min). After each experimental ischemia/reperfusion sequence, the heart was frozen in liquid nitrogen. Lipid peroxides were assayed in the cardiac homogenate and the catalytic of xanthine oxidase and enzymic antioxidant systems (glutathione peroxidase, superoxide dismutase and catalase) were determined in the centrifuged supernatant. In the different experimental protocols studied in this work, there was no significant increase in the activity of cardiac xanthine oxidase or in the level of lipid peroxides when compared to the non reperfused or to the continuously perfused hearts. Indeed, enzymic antioxidant systems were also not significantly modified in the different periods of reperfusion when compared to control hearts (continuously perfused hearts).
These results suggest that xanthine oxidase is apparently not a major source of free radicals in the course of an ischemia-reperfusion sequence in heart muscle, in particular, if we consider the early phases of reperfusion. The process of lipid peroxidation, assessed by assaying thiobarbituric acid reactants, is not a predominant phenomenon of reperfusion-induced injury, at least in the experimental model used here. However, enzymic antioxidant systems investigated in this study do not seem modified. This could mean that the small quantity of oxygen free radicals produced does not overwhelm the enzymic antioxidant systems of myocardium which is in agreement with peroxidatized lipid results.
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Abbreviations
- DMPO:
-
dimethyl pyrroline-N-oxide
- EPR:
-
electron paramagnetic resonance
- GPx:
-
glutathione peroxidase
- LDH:
-
lactate dehydrogenase
- LP:
-
lipid peroxides
- OFR:
-
oxygen free radicals
- SOD:
-
superoxide dismutase
- TBAR:
-
thiobarbituric acid reactants
- XD:
-
xanthine dehydrogenase
- XO:
-
xanthine oxidase
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Coudray, C., Pucheu, S., Boucher, F. et al. Ischemia and reperfusion injury in isolated rat heart: Effect of reperfusion duration on xanthine oxidase, lipid peroxidation, and enzyme antioxidant systems in myocardium. Basic Res Cardiol 87, 478–488 (1992). https://doi.org/10.1007/BF00795060
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DOI: https://doi.org/10.1007/BF00795060