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Effects of dietary selenium on glutathione peroxidase and thioredoxin reductase activity and recovery from cardiac ischemia-reperfusion.

Abstract
Glutathione 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 microg/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.
AuthorsKylie Venardos, Glenn Harrison, John Headrick, Anthony Perkins
JournalJournal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (J Trace Elem Med Biol) Vol. 18 Issue 1 Pg. 81-8 ( 2004) ISSN: 0946-672X [Print] Germany
PMID15487768 (Publication Type: Journal Article)
Chemical References
  • Glutathione Peroxidase
  • Thioredoxin-Disulfide Reductase
  • Selenium
Topics
  • Animals
  • Body Weight
  • Diet
  • Dietary Supplements
  • Glutathione Peroxidase (metabolism)
  • In Vitro Techniques
  • Liver (enzymology)
  • Male
  • Myocardial Contraction (drug effects)
  • Myocardial Ischemia (metabolism)
  • Myocardial Reperfusion
  • Myocardium (metabolism)
  • Random Allocation
  • Rats
  • Rats, Wistar
  • Selenium (administration & dosage, metabolism, pharmacology)
  • Thioredoxin-Disulfide Reductase (metabolism)

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