Zinc ameliorates lead toxicity by reducing body Pb burden and restoring Pb-induced haematological and biochemical derangements

Abstract

Background: Studies on nutritional factors, including zinc in ameliorating the deleterious effects of potentially toxic elements have been scarce and the findings have been inconsistent. Aim: The aim of the present study was to evaluate the ameliorative potential of zinc against lead-induced toxicity in rats. Materials and methods: Male albino rats (n ¼ 24) assigned into four groups of six/group: normal control (NC), zinc control (ZnC; 20 mg/kg ZnCl 2), lead control (PbC; 50 mg/kg PbCl 2) and lead plus zinc (Pb þ Zn; 50 mg/kg PbCl 2 plus 20 mg/kg ZnCl 2), respectively were investigated. All administrations were through oral route and lasted for 42 days after which blood samples were collected for haema-tological and biochemical analyses using standard techniques. Results: Results showed that packed cell volume (PCV), haemoglobin concentration (HBC), red blood cell count (RBC) were significant (p < 0.05) reduced while total white blood cell count (TWBC), mean corpuscular haemoglobin (MCH), mean corpuscular haemoglobin concentration (MCHC) and platelets were significantly elevated in PbC group in comparison with NC and ZnC. Also liver and renal function parameters as well as the liver and kidney malondialdehyde (MDA) were elevated while antioxidant enzymes; catalase (CAT) and superoxide dismutase (SOD) were significantly (p < 0.05) reduced in PbC group in comparison with NC and ZnC. Concentrations of lead were in the order: blood > liver > kidney in the PbC group. In addition to restoration of the altered parameters, administration of zinc in Pb þ Zn group significantly reduced the raised lead concentrations in the plasma and organs. Conclusion: Reduction in body Pb burden and restoration of Pb-induced derangements in haematological and biochemical parameters by Zn strongly support the ameliorative property of Zn against Pb-induced toxicity.