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Effects of high sucrose diet on insulin-like effects of vanadate in diabetic rats

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Abstract

The insulin-like effects of vanadate were compared in streptozotocin-induced diabetic rats fed on high starch control and high sucrose diets for a period of six weeks. Diabetic rats in both diet groups were characterized by hypoinsulinemia, hyperglycemia (6.8–7.0 fold increase) and significant decreases (p<0.001) in the activities of glycogen synthase, phosphorylase and lipogenic enzymes, ATP-citrate lyase, glucose 6-phosphate dehydrogenase and malic enzyme in liver. There were no diet-dependent differences in these abnormalities. However, the insulin-mimetic agent vanadate was more effective in diabetic rats fed sucrose diet as compared to animals fed control starch diet. Vanadate administration resulted in 30% and 64% decreases in plasma glucose levels in diabetic rats fed control and sucrose diets, respectively. The activities of glycogen synthase (active) and phosphorylase (active and total) were restored significantly by vanadate in control (p<0.05–0.01) and sucrose (p<0.001) diets fed diabetic rats. This insulin-mimetic agent increased the activities of hepatic lipogenic enzymes in control diet fed rats to 38–47% of normal levels whereas in sucrose fed group it completely restored the activities. Sucrose diet caused a distinct effect on the plasma levels of triacylglycerol (4-fold increase) and apolipoprotein B (2.8-fold increase) in diabetic rats and vanadate supplementation decreased their levels by 65–75%. These data indicate that vanadate exerts insulin-like effects in diabetic rats more effectively in sucrose fed group than the animals fed control diet. In addition, vanadate also prevents sucrose-induced hypertriglyceridemia.

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  1. Department of Biochemistry, University of Saskatchewan, S7N OWO, Saskatoon, Saskatchewan, Canada

    Subbiah Pugazhenthi, Joseph F. Angel & Ramji L. Khandelwal

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  1. Subbiah Pugazhenthi
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  2. Joseph F. Angel
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  3. Ramji L. Khandelwal
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Pugazhenthi, S., Angel, J.F. & Khandelwal, R.L. Effects of high sucrose diet on insulin-like effects of vanadate in diabetic rats. Mol Cell Biochem 122, 77–84 (1993). https://doi.org/10.1007/BF00925740

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  • DOI: https://doi.org/10.1007/BF00925740

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