High fructose intake significantly reduces kidney copper concentrations in diabetic, islet transplanted rats |
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Authors: | R C Bell T M Sakanashi C L Keen D T Finegood |
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Institution: | (1) Department of Medicine, Division of Endocrinology and Metabolism, University of Alberta, T6E 2S2 Edmonton, Alberta, Canada;(2) Department of Health Studies and Gerontology, University of Waterloo, N2L 3G1 Waterloo, Ont., Canada;(3) Department of Nutrition, University of California at Davis, Davis, CA;(4) Department of Physiology, University of Alberta, Edmonton, Alberta, Canada;(5) School of Kinesiology, Simon Fraser University, Burnaby, BC, Canada |
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Abstract: | Trace element status is known to be altered in the diabetic state, although the factors affecting trace element homeostasis
in this condition are not well understood. The authors examined the effects of a high fructose diet (40% wt:wt) vs a control
diet on the copper (Cu), zinc (Zn), and iron (Fe) concentrations in the kidney, plasma, and red blood cells of islet transplanted
(TX) and shamoperated (SHAM) rats. Male, Wistar Furth rats made diabetic by streptozotocin injection (55 mg/kg, iv) were given
an intraportal islet transplant (1000 islets); control animals were shaminjected, shamoperated (SHAM). Rats within TX and
SHAM groups were assigned to either a high fructose diet (40% fructose, 25% cornstarch, FR) or a purified control diet (33%
cornstarch, 33% dextrose, CNTL) containing identical amounts of mineral mixture for a period of 6 wk. Kidney Cu concentration
was significantly elevated among hyperglycemie TXCNTL rats (224 ± 25 nmol/g wet wt), but was markedly reduced in hyperglycemic
TXFR rats (109 ± 14 nmol/g) relative to normoglycemic controls. This occurred in spite of similar levels of glucose, insulin
(fed and fasted), insulin secretory capacity, body weight, and food intake in the TXCNTL and TXFR groups. Among the subgroup
of rats with normal glucose levels post-TX, kidney Cu levels normalized and were unaffected by dietary treatment (normoglycemic
TXCNTL = 60 ± 5 nmol/g; normoglycemic TXFR = 40 ± 2 nmol/g). Kidney Cu concentrations also were unaffected by fructose feeding
in SHAM animals (CNTL, 60 ± 4 nmol/g and FR, 51 ± 5 nmol/g). Kidney Zn and Fe concentrations were similar among the treatment
groups. Plasma and red blood cell (RBC) Cu, Zn, and Fe concentrations were also similar among the groups. Since fructose feeding
led to a substantial reduction of kidney Cu concentrations in the presence of hyperglycemia, the authors suggest that this
model can be useful in examining effects of altered kidney Cu accumulation in the diabetic animal. |
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Keywords: | Diabetes trace elements kidney copper fructose rats |
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