Abstract
The influences of selenium deficiency (Se-D), chronic training, and an acute bout of exercise on hepatic and skeletal muscle antioxidant enzymes, i.e., Superoxide dismutase (SOD), catalase, and glutathione peroxidase (GPX), as well as glutathione S-transferase (GST) and tissue lipid peroxidation, were investigated in post-weaning male SpragueDawley rats. Se-D per se depleted GPX in both liver and skeletal muscle but had no effect on SOD or catalase activity. One hour of treadmill running (20 m/min, 0% grade and 27 m/min, 15% grade for untrained and trained rats, respectively) significantly elevated hepatic catalase and cytosolic SOD activity; more prominent activations were found in the Se-D or untrained rats, whereas skeletal muscle antioxidant enzymes were little affected. Ten weeks of training (1 h/day, 5 days/week at 27 m/min, 15% grade) increased hepatic mitochondrial SOD by 23% (P < 0.05) in Se-D rats. Both hepatic mitochondrial and cytosolic GPX were decreased by training whereas GPX was increased twofold in skeletal muscle mitochondria. Se-independent GPX was elevated by training only in the skeletal muscle mitochondria of Se-D rats. Lipid peroxidation (malondialdehyde formation) was increased by an acute bout of exercise in hepatic mitochondria of the untrained rats and in skeletal muscle mitochondria of the Se-D rats. These data indicate that antioxidant enzymes in liver and skeletal muscle are capable of adapting to selenium deficiency and exercise to minimize oxidative injury caused by free radicals.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 150-160 |
| Number of pages | 11 |
| Journal | Archives of Biochemistry and Biophysics |
| Volume | 263 |
| Issue number | 1 |
| DOIs | |
| State | Published - May 15 1988 |
| Externally published | Yes |
Bibliographical note
Funding Information:i The present investigation was supported Grant AM 10334 from the National Institutes Health, and by the Vilas Trust of the University Wisconsin-Madison. s To whom correspondence should be addressed. s Abbreviations used: ALT, alanine aminotransferase; CS, citrate synthase; GPX, glutathione peroxidase; GST, glutathione S-transferase; HsOs, hydrogen peroxide; . OH, hydroxyl radical; MDH, malate dehydrogenase; MDA, malondialdehyde; GSSG, oxidized glutathione; GSH, reduced glutathione; Op, superoxide anion; SOD, superoxide dismutase.