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Glutathione disulfide as an index of oxidative stress during postischemic reperfusion in isolated rat hearts

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Abstract

The objectives of this study were to determine 1) whether reactive oxygen species generated upon postischemic reperfusion lead to oxidative stress in rat hearts, and 2) whether an exogenous prooxidant present in the early phase of reperfusion causes additional injury. Isolated buffer-perfused rat hearts were subjected to 30 min of hypothermic no-flow ischemia followed by 30 min of reperfusion. Increased myocardial content of glutathione disulfide (GSSG) and increased active transport of GSSG were used as indices of oxidative stress. To impose a prooxidant load, cumene hydroperoxide (20 μM) was administered during the first 10 min of reperfusion to a separate group of postischemic hearts. Reperfusion after 30 min of hypothermic ischemia resulted in a recovery of myocardial ATP from 28% at end-ischemia to 50–60%, a release of 5% of total myocardial LDH, and an almost complete recovery of both coronary flow rate and left ventricular developed pressure. After 5 and 30 min of reperfusion, neither myocardial content of GSSG nor active transport of GSSG were increased. These indices were increased, however, if cumene hydroperoxide was administered during early reperfusion. After stopping the administration of cumene hydroperoxide, myocardial GSSG content returned to control values and GSH content increased, indicating an unimpaired glutathione reductase reaction. Despite the induction of oxidative stress, reperfusion with cumene hydroperoxide did not cause additional metabolic, structural, or functional injury when compared to reperfusion without cumene hydroperoxide. We conclude that reactive oxygen species generated upon postischemic reperfusion did not lead to oxidative stress in isolated rat hearts. Moreover, even a superimposed prooxidant load during early reperfusion did not cause additional injury.

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Authors and Affiliations

  1. Department of Cardiology, University Hospital Leiden, Building 1, D4-P19, Rijnsburgerweg 10, 2333 AA, Leiden, The Netherlands

    Robert J. A. M. Verbunt, Willem G. van Dockum, E. M. Lars Bastiaanse, Janneke M. Egas & Arnoud van der Laarse

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  1. Robert J. A. M. Verbunt
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  2. Willem G. van Dockum
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  3. E. M. Lars Bastiaanse
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  4. Janneke M. Egas
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  5. Arnoud van der Laarse
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Verbunt, R.J.A.M., van Dockum, W.G., Bastiaanse, E.M.L. et al. Glutathione disulfide as an index of oxidative stress during postischemic reperfusion in isolated rat hearts. Mol Cell Biochem 144, 85–93 (1995). https://doi.org/10.1007/BF00926745

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  • DOI: https://doi.org/10.1007/BF00926745

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