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Effect of lead exposure on liver lipid peroxidative and antioxidant defense systems of protein-undernourished rats

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Abstract

The effect of the liver mitogen, lead nitrate [Pb(NO3)2], on protein-undernutrition-induced increased lipid peroxidation and reduced antioxidants levels was investigated in rats. Animals were divided into four groups: A, B, C, and D of five animals each. Animals in groups C and D were placed on a low-protein diet (5% casein) and animals in groups A and B were maintained on a normal diet (16% casein) for 14 wk and fed ad libitum. Animals in groups B and D were each given a single intravenous injection of Pb(NO3)2 (100 μmol/kg body weight) 72 h before sacrifice. The results confirm that protein undernutrition (PU) induced an increase in lipid peroxidation with concomitant reductions in catalase (CAT) activity, glutathione (GSH) level, and superoxide dismutase (SOD) activity. Lead (Pb) treatment, however, provoked increased lipid peroxidation, CAT activity, and GSH level but resulted in reduced SOD activity in both normal and PU-rats. These results suggest that Pb exacerbates liver lipid peroxidation in PU rats and suggests the involvement of free radicals in the pathogenesis of Pb poisoning. In addition, the results show that Pb affects well-fed and PU rats in similar ways but that the CAT activity of PU rats is more sensitive to the effect of Pb than that of normal rats.

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Adegbesan, B.O., Adenuga, G.A. Effect of lead exposure on liver lipid peroxidative and antioxidant defense systems of protein-undernourished rats. Biol Trace Elem Res 116, 219–225 (2007). https://doi.org/10.1007/BF02685932

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