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• W2079439946 abstract "Selenium is an essential component of glutathione peroxidase, which reduces free and esterified hydroperoxides of polyunsaturated fatty acids. Adequate glutathione peroxidase activity could be important for the maintenance of prostacyclin synthesis by blood vessels, since hydroperoxides can inhibit the formation of this substance. We have investigated the effects of dietary selenium deficiency on glutathione peroxidase activity and the synthesis of 6-oxoprostaglandin F1 alpha and monohydroxy and trihydroxy metabolites of polyunsaturated fatty acids by aorta. The latter products can be formed either by the actions of cyclooxygenase or lipoxygenase or by lipid peroxidation. Aortic glutathione peroxidase activity was reduced by over 80% by feeding rats a selenium-deficient diet for 4 weeks, and to undetectable levels after 6 weeks. There were no appreciable differences in the levels of free and esterified oxygenated metabolites of linoleic acid or arachidonic acid between the control and treated groups after 4 weeks. However, after 6 weeks, there were modest, but statistically significant reductions in the formation of 6-oxoprostaglandin F1 alpha and monohydroxy products formed by cyclooxygenase. On the other hand, the amounts of esterified 18:2 metabolites appeared to be higher in aortae from animals on the selenium-deficient diet, although only the increase in esterified 9-hydroxy-10,12-octadecadienoic acid was statistically significant. These results suggest that selenium deficiency can affect the formation of prostacyclin and other oxygenated metabolites of polyunsaturated fatty acids by aorta, possibly by increasing lipid peroxidation. However, the differences between control and selenium-deficient rats after 6 weeks were not very dramatic, in spite of the fact that glutathione peroxidase activity was undetectable. It would therefore appear that additional mechanisms are also involved in controlling the levels of lipid hydroperoxides in aorta." @default.
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• W2079439946 date "1987-09-01" @default.
• W2079439946 modified "2023-09-26" @default.
• W2079439946 title "Effects of selenium-deficient diets on the production of prostaglandins and other oxygenated metabolites of arachidonic acid and linoleic acid by rat and rabbit aortae" @default.
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• W2079439946 doi "https://doi.org/10.1016/0005-2760(87)90021-x" @default.
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