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dc.contributor.authorVenardos, Kylieen_US
dc.contributor.authorHarrison, Glennen_US
dc.contributor.authorHeadrick, Johnen_US
dc.contributor.authorPerkins, Anthonyen_US
dc.contributor.editorVirginia Negretti de Braetter [Editor-in-Chief]en_US
dc.description.abstractGlutathione peroxidase and thioredoxin reductase are selenocysteine-dependent enzymes that protect against oxidative injury. This study examined the effects of dietary selenium on the activity of these two enzymes in rats, and investigated the ability of selenium to modulate myocardial function post ischemia-reperfusion. Male wistar rats were fed diets containing 0, 50, 240 and 1000 姯kg sodium selenite for 5 weeks. Langendorff perfused hearts isolated from these rats were subjected to 22.5 min global ischemia and 45 min reperfusion, with functional recovery assessed. Liver samples were collected at the time of sacrifice, and heart and liver tissues assayed for thioredoxin reductase and glutathione peroxidase activity. Selenium deficiency reduced the activity of both glutathione peroxidase and thioredoxin reductase systemically. Hearts from selenium deficient animals were more susceptible to ischemia-reperfusion injury when compared to normal controls (38% recovery of rate pressure product (RPP) vs. 47% recovery of RPP). Selenium supplementation increased the endogenous activity of thioredoxin reductase and glutathione peroxidase and resulted in improved recovery of cardiac function post ischemia-reperfusion (57% recovery of RPP). Endogenous activity of glutathione peroxidase and thioredoxin reductase is dependent on an adequate supply of the micronutrient selenium. Reduced activity of these antioxidant enzymes is associated with significant reductions in myocardial function post ischemia-reperfusion.en_US
dc.publisherElsevier GmbH, Urban & Fischer Verlagen_US
dc.relation.ispartofjournalJournal of Trace Elements in Medicine and Biologyen_US
dc.titleEffects of dietary selenium on glutathione peroxidase and thioredoxin reductase activity and recovery from cardiac ischemia-reperfusionen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.facultyGriffith Health, School of Medical Scienceen_US
gro.rights.copyrightCopyright 2004 Elsevier : Reproduced in accordance with the copyright policy of the publisher : This journal is available onlineen_AU
gro.hasfulltextNo Full Text

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