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Antioxidant enzyme activity in the muscles of calves depleted of vitamin E or selenium or both

Published online by Cambridge University Press:  09 March 2007

Dominic M. Walsh
Affiliation:
Veterinary Sciences Division, Department of Agriculture for Northern Ireland, Stormont, Belfast BT4 3SD
D. Glenn Kennedy
Affiliation:
Veterinary Sciences Division, Department of Agriculture for Northern Ireland, Stormont, Belfast BT4 3SD
Edward A. Goodall
Affiliation:
Biometrics Division, Department of Agriculture for Northern Ireland, Stormont, Belfast BT4 3SD
Seamus Kennedy
Affiliation:
Veterinary Sciences Division, Department of Agriculture for Northern Ireland, Stormont, Belfast BT4 3SD
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Abstract

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Feeding diets depleted of vitamin E and Se to cattle can induce a disease known as nutritional degenerative myopathy. It is believed that an increased peroxidative challenge in muscle is involved in the pathogenesis of this disease. A number of species can up-regulate the activity of some antioxidant enzymes, including glutathione reductase (EC 1.6.4.2), glutathione transferase (EC 2.5.1.18), glucose-6-phosphate dehydrogenase (EC 1.1.1.49), catalase (EC 1.11.1.6), and superoxide dismutase (EC 1.15.1.1), in an attempt to mitigate the effects of a peroxidative challenge. A 2 × 2 factorial study was set up to examine possible changes in the activities of these antioxidant enzymes in muscles of ruminant calves fed on diets low in either vitamin E or Se. Four groups of four calves each were fed on a basal diet of NaOH-treated barley which was supplemented with α-tocopherol or Se or both for a total of 50 weeks. Calves fed on diets depleted of vitamin E, but not those ted on diets low in Se, developed subclinical myopathy, as judged by increases in the activity of plasma creatine kinase (EC 2.7.3.2), and had increased muscle concentrations of two indices of lipid peroxidation, namely thiobarbituric acidreactive substances, with and without ascorbate activation. Feeding diets depleted of vitamin E and diets low in Se both increased muscle activities of glucose-6-phosphate dehydregenase in heart, biceps and supraspinatus. This change may have occurred in an attempt to maintain intracellular pools of reduced glutathione. No other changes in antioxidant enzyme activity were observed.

Type
Enzymatic Effects of Vitamin E or Selenium Depletion
Copyright
Copyright © The Nutrition Society 1993

References

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