Urinary Excretion of Water-Soluble Vitamins Increases in Streptozotocin-Induced Diabetic Rats without Decreases in Liver and Blood Vitamin Content

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  • IMAI Eri
    Department of Food Science and Nutrition, School of Human Cultures, The University of Shiga Prefecture
  • SANO Mitsue
    Department of Food Science and Nutrition, School of Human Cultures, The University of Shiga Prefecture
  • FUKUWATARI Tsutomu
    Department of Food Science and Nutrition, School of Human Cultures, The University of Shiga Prefecture
  • SHIBATA Katsumi
    Department of Food Science and Nutrition, School of Human Cultures, The University of Shiga Prefecture

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  • Urinary Excretion of Water-Soluble Vitamins Increases in Streptozotocin-Induced Diabetic Rats without Decreases in Liver or Blood Vitamin Content

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It is thought that the contents of water-soluble vitamins in the body are generally low in diabetic patients because large amounts of vitamins are excreted into urine. However, this hypothesis has not been confirmed. To investigate this hypothesis, diabetes was induced in male Wistar rats (6 wk old) by streptozotocin treatment, and they were then given diets containing low, medium or sufficient vitamins for 70 d. The contents of 6 kinds of B-group vitamins, namely vitamin B1, vitamin B2, vitamin B6, vitamin B12, folate and biotin, were determined in the urine, blood and liver. No basic differences among the dietary vitamin contents were observed. The urinary excretion of vitamins was higher in diabetic rats than in control rats. The blood concentrations of vitamin B12 and folate were lowered by diabetes, while, those of vitamin B1, vitamin B2, vitamin B6, and biotin were not. All liver concentrations of vitamins were increased in diabetic rats above those in control rats. These results showed that streptozotocin-induced diabetes increased urinary excretion of water-soluble vitamins, though their blood and liver concentrations were essentially maintained in the rats.

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