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Glutathione effects on vitamin D metabolism in control and streptozotocin diabetic rat |
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| Authors: | Harold P. Schedl Helen D. Wilson Ron L. Horst Karla Christensen Kice Brown |
| Affiliation: | *Veterans Administration Medical Center, Gastroenterology-Hepatology Research Laboratories, Iowa City, IA 52242 USA †National Animal Disease Laboratories, USDA, Ames, IA 50010 USA **Department of Preventive Medicine, University of Iowa College of Medicine, Iowa City, IA 52242 USA |
| Abstract: | The circulating concentration of 1,25-dihydroxycholecalciferol [1,25-(OH)2D3] is a physiologic index of enzymatic activity of the renal 1-hydroxylase of 25-hydroxychole-calciferol (25-OH-D3). Hydroxylation of 25-OH-D3 and circulating 1,25-(OH)2D3 are decreased in the streptozotocin diabetic rat. We previously found that activity of another redox enzyme system, cytosolic superoxide dismutase, also decreased in streptozotocin diabetes, can be restored by treatment with glutathione. In the present experiment we tested the effect of glutathione treatment on vitamin D metabolism in control and diabetic rats. Enteral glutathione increased circulating 1,25-(OH)2D3 and decreased 25-OH-D3 in both control and diabetic animals. These results suggest that exogenous glutathione increases 25-OH-D3 1-hydroxylation both under basal conditions in the normal animal and in diabetes-induced depression. |
| Keywords: | Glutathione 1,25-Dihydroxycholecalciferol Redox enzyme system |
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