The influence of alpha-lipoic acid on the toxicity of cadmium

Gen Physiol Biophys. 1999 Oct;18 Spec No:28-32.

Abstract

Alpha-lipoic acid (alpha-LA) is an important antioxidant drug with chelating properties. In experiments performed in male mice (CD-1, Charles River) the effects of cadmium on lipid peroxidation (LP), GSH level, the activity of catalase and glutathione peroxidase (GSH-Px) in liver homogenates were studied. Mice were injected with CdCl2 x 2.5 H2O at a dose of 40 micromol x kg(-1) s.c. Alpha-LA was administered simultaneously i.p. at the dose corresponding to alpha-LA-to-Cd molar ratio of 5:1. The experiments were completed at 24 h. Cadmium increased LP to 200.7% of controls. This effect was prevented by alpha-LA treatment (p < or = 0.05). GSH level was decreased to 81.7% of controls and it was not affected by alpha-LA. GSH-Px activity diminished by Cd administration was corrected by alpha-LA (p < 0.001). Catalase activity decreased by Cd remained unaffected. The administration of alpha-LA alone enhanced LP and the activity of catalase. As estimated by AAS, Cd content in the liver, the kidneys, the brain and the testes remained unaffected by alpha-LA treatment. In the acute toxicity experiment, the mortality associated with cadmium was decreased by alpha-LA administration. The results suggest that the toxicity of Cd was decreased mainly by the antioxidant activity of alpha-LA rather than by cadmium removal from tissues.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antioxidants / pharmacology
  • Brain / drug effects
  • Brain / metabolism
  • Cadmium / antagonists & inhibitors
  • Cadmium / pharmacokinetics
  • Cadmium / toxicity*
  • Glutathione / metabolism
  • Glutathione Peroxidase / metabolism
  • Kidney / drug effects
  • Kidney / metabolism
  • Lipid Peroxidation / drug effects*
  • Liver / drug effects
  • Liver / metabolism*
  • Male
  • Malondialdehyde / metabolism
  • Mice
  • Testis / drug effects
  • Testis / metabolism
  • Thiobarbituric Acid Reactive Substances / metabolism
  • Thioctic Acid / pharmacology*
  • Tissue Distribution

Substances

  • Antioxidants
  • Thiobarbituric Acid Reactive Substances
  • Cadmium
  • Malondialdehyde
  • Thioctic Acid
  • Glutathione Peroxidase
  • Glutathione