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Streptozotocin-induced diabetes in rats is associated with impaired metabolic availability of vitamin A (retinol)

Published online by Cambridge University Press:  09 March 2007

P. J. Tuitoek ,
S. Ziari ,
A. T. C. Tsin ,
R. V. Rajotte ,
Miyoung Suh  and
Tapan K. Basu*
P. J. Tuitoek
Affiliation:
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, CanadaT6G 2P5
S. Ziari
Affiliation:
Division of Life Sciences, The University of Texas at San Antonio, San Antonio, Texas 78249-0662, USA
A. T. C. Tsin
Affiliation:
Division of Life Sciences, The University of Texas at San Antonio, San Antonio, Texas 78249-0662, USA
R. V. Rajotte
Affiliation:
Surgical-Medical Research Institute, University of Alberta, Edmonton, Alberta, CanadaT6G 2N8
Miyoung Suh
Affiliation:
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, CanadaT6G 2P5
Tapan K. Basu*
Affiliation:
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, CanadaT6G 2P5
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Abstract

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Using streptozotocin-induced diabetic Wistar rats, studies were carried out to examine the metabolic availability of vitamin A in the plasma, liver and the retina of the eye. Control and diabetic rats were fed ad lib. on a semi-purified diet either with or without (basal) vitamin A supplementation, or pair-fed on the basal diet for 4 weeks. Despite the fact that diabeticrats consumed 48% more feed, they had lower plasma concentrations of retinol (P<0·003). The decrease in plasma retinol concentration was a response to diabetes (or diabetes-induced trauma), since neither pair-feeding (P<0·01) nor vitamin A supplementation altered this effect (P<0·05). Furthermore, the hepatic concentrations of the vitamin in these animals remained elevated and this increase was greater in the supplemented diabetic group (P<0·001). Decreases in 11-cis retinal (a component of rhodopsin) concentrations in the retina were also observed in diabetic animals. The increased hepatic and the decreased plasma and retina vitamin Alevels suggest a defect in the transport of the vitamin from the liver.

Keywords

DiabetesStreptozotocinVitamin A
Type
Vitamin A metabolism in rats
Information
British Journal of Nutrition , Volume 75 , Issue 4 , April 1996 , pp. 615 - 622
Copyright
Copyright © The Nutrition Society 1996

References

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