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Effect of high dietary zinc on plasma ceruloplasmin and erythrocyte superoxide dismutase activities in Copper-depleted and repleted rats

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Abstract

The effect of moderately high dietary zinc (Zn) on the activities of plasma (PL) ceruloplasmin (CP), and PL and erythrocyte (RBC) copper (Cu), Zn superoxide dismutase (SOD) was determined in weanling rats fed Cu-deficient (DEF; <1 mg Cu/kg), marginal (MAR; 2 mg Cu/kg), or control (CON; 5 mg Cu/kg) copper diets containing normal or high Zn (HZn; 60 mg/kg) for 4 wk and supplemented with oral Cu (CuS; 5 mg/L) in drinking water for 0, 1, 3, or 7 d. PL Cu decreased (67% compared to CON;p≤0.05) in the DEF and increased to control level after 3 d of CuS; increased in the MAR group after 1 d of CuS. HZn reduced overall PL Cu by 27% in all groups, but did not alter the linear increase in PL Cu between 0 and 3 d of Cu S. PL CP activity altered concomitantly with PL Cu levels: The time course of increase in CP activity after 0–3 d of CuS was not influenced by HZn in the diet and CP declined in the DEF group by 92%. There was no correlation between dietary Cu level and PL CP. PL SOD activity decreased by 46% (p≤.05) in the DEF group, increased to control activity after 1 d of CuS and declined slighty after 7 d; MAR diet did not alter PL SOD. HZn diet increased PL SOD activity in all groups by 150%, reduced activity in the DEF and MAR groups by 65 and 37% and delayed the recovery of PL SOD after CuS. RBC SOD declined in the DEF and MAR groups by 56 and 33% (p≤0.05) and did not respond to CuS; HZn diet did not influence RBC SOD activity. These data indicate that moderately high Zn in the diet reduces PL Cu, but not PL CP activity or the recovery of PL Cu or CP activity after oral CuS of Cu-deficient rats, modifies the response of PL SOD to dietary Cu, but does not influence RBC SOD activity.

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  1. Nutrition Program, Kentucky State University, Atwood Research Building, 40601, Frankfort, KY

    Myna Panemangalore & Frederick N. Bebe

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  1. Myna Panemangalore
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  2. Frederick N. Bebe
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Correspondence to Myna Panemangalore.

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Panemangalore, M., Bebe, F.N. Effect of high dietary zinc on plasma ceruloplasmin and erythrocyte superoxide dismutase activities in Copper-depleted and repleted rats. Biol Trace Elem Res 55, 111–126 (1996). https://doi.org/10.1007/BF02784173

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