Influence of dietary carbohydrate on zinc-deficiency-induced changes in oxidative defense mechanisms and tissue oxidative damage in rats
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Abstract
The aim of this study was to determine the effect of dietary carbohydrate type on the expression of zinc (Zn) deficiency in rats with respect to tissue oxidative damage and defense mechanisms. Rats were fed diets containing adequate (+Zn) or low concentrations (-Zn) of Zn. Both fructose- and glucose-based diets were tested. Pair-fed controls were also studied to evaluate changes in the oxidative defense system which are secondary to Zn-deficiency-induced anorexia. Plasma and liver Zn concentrations and CuZn superoxide dismutase activities were lower in the -Zn rats than in the +Zn rats. Liver glutathione (GSH) and disulfide glutathione concentrations were higher in the -Zn rats than in the +Zn rats; this difference was most pronounced in the fructose groups. Liver and heart selenium glutathione peroxidase (Se-GSH-Px) activities were lower in the -Zn-fructose group than in the +Zn-fructose group. Liver Se-GSH-Px activity was higher in the fructose groups than in the glucose groups. Liver GSH reductase (GSH-Red) activity was lower in the -Zn-fructose group than in its control group. Liver glutamine synthetase activity was lower in the -Zn-glucose group and in the fructose groups than in the glucose control group. Liver thiobarbituric acid reactive substance (TBARS) production was similar among the groups. Collectively, these results support the concept that Zn deficiency can result in an impaired oxidant defense system. Based on the observation that pair-fed control animals also showed evidence of oxidative damage, we suggest that one factor that contributes to the effect of Zn deficiency is the reduction in caloric intake that occurs in these animals. Fructose feeding resulted in increased activities of several of the oxidant defense enzymes. Protein oxidative damage assessed by glutamine synthetase activity was increased by both Zn deficiency and fructose feeding.
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Zinc deficiency fructose oxidant defense system TBARS ratsPreview
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