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Environmental Science and Pollution Research

, Volume 24, Issue 31, pp 24593–24601 | Cite as

Efficacy of α-lipoic acid against cadmium toxicity on metal ion and oxidative imbalance, and expression of metallothionein and antioxidant genes in rabbit brain

  • Hamida M. Saleh
  • Yasser S. El-SayedEmail author
  • Sherif M. Naser
  • Abdelgawad S. Eltahawy
  • Atsuto Onoda
  • Masakazu Umezawa
Research Article

Abstract

To explore the protective efficacy of α-lipoic acid (ALA) against Cd-prompted neurotoxicity, young male New Zealand rabbits (Oryctolagus cuniculus) were divided randomly into four groups. Group 1 (control) received demineralized water. Group 2 (Cd) administered cadmium chloride (CdCl2) 3 mg/kg bwt. Group 3 (ALA) administered ALA 100 mg/kg bwt. Group 4 (Cd + ALA) administered ALA 1 h after Cd. The treatments were administered orally for 30 consecutive days. Cd-induced marked disturbances in neurochemical parameters were indicated by the reduction in micro- and macro-elements (Zn, Fe, Cu, P, and Ca), with the highest reduction in Cd-exposed rabbits, followed by Cd + ALA group and then ALA group. In the brain tissues, Cd has significantly augmented the lipid hydroperoxides (LPO) and reduced the glutathione (GSH) and total antioxidant capacity (TAC), and glutathione peroxidase and glutathione S-transferase enzyme activities but had an insignificant effect on the antioxidant redox enzymes. Administration of ALA effectively restored LPO and sustained GSH and TAC contents. Moreover, Cd downregulated the transcriptional levels of Nrf2, MT3, and SOD1 genes, and upregulated that of Keap1 gene. ALA treatment, shortly following Cd exposure, downregulated Keap1, and upregulated Nrf2 and GPx1, while maintained MT3 and SOD1 mRNA gene expression in the rabbits’ brain. These data indicated the ALA effectiveness in protecting against Cd-induced oxidative stress and the depletion of cellular antioxidants in the brain of rabbits perhaps due to its antioxidant, free radical scavenging, and chelating properties.

Keywords

α-Lipoic acid Cadmium Rabbit Brain Oxidative stress Gene expression 

Notes

Compliance with ethical standards

Competing interests

The authors declare that they have no competing interests.

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© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Department of Forensic Medicine and Toxicology, Faculty of Veterinary MedicineDamanhour UniversityDamanhourEgypt
  2. 2.Department of Veterinary Genetics, Faculty of Veterinary MedicineDamanhour UniversityDamanhourEgypt
  3. 3.Department of Veterinary Economics, Faculty of Veterinary MedicineDamanhour UniversityDamanhourEgypt
  4. 4.The Center for Environmental Health Science for the Next Generation, Research Institute for Science and TechnologyTokyo University of ScienceNodaJapan
  5. 5.Department of Hygienic Chemistry, Graduate School of Pharmaceutical SciencesTokyo University of ScienceNodaJapan
  6. 6.Research Fellow of Japan Society for the Promotion of ScienceTokyoJapan
  7. 7.Department of Materials Science and Technology, Faculty of Industrial Science and TechnologyTokyo University of ScienceTokyoJapan

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