Zinc inhibits ethanol-induced HepG2 cell apoptosis

Toxicol Appl Pharmacol. 2008 May 15;229(1):1-9. doi: 10.1016/j.taap.2007.11.019. Epub 2007 Dec 3.

Abstract

Alcohol consumption produces a variety of metabolic alterations in liver cells, associated with ethanol oxidation and with nonoxidative metabolism of ethanol, among others apoptosis of hepatocytes. As zinc is known as a potent antioxidant and an inhibitor of cell apoptosis, the aim of this paper was to investigate whether zinc supplementation could inhibit ethanol-induced HepG2 apoptosis, and whether this inhibition was connected with attenuation of oxidative stress and modulation of FasR/FasL system expression. The results indicated that zinc supplementation significantly inhibited ethanol-induced HepG2 cell apoptosis (measured by cytochrome c release from mitochondria and caspase-3 activation) by attenuation of reactive oxygen species (ROS) production, increase in the cellular level of GSH, inhibition of ethanol-induced sFasR and FasL overexpression and caspase-8 activation. These results indicate that zinc can inhibit ethanol-induced hepatocyte apoptosis by several independent mechanisms, among others by an indirect antioxidative effect and probably by inhibition of caspase-8 and caspase-9 activation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antioxidants / pharmacology*
  • Apoptosis / drug effects
  • Caspase 3 / drug effects
  • Caspase 3 / metabolism
  • Caspase 8 / drug effects
  • Caspase 8 / metabolism
  • Caspase 9 / drug effects
  • Caspase 9 / metabolism
  • Cell Line, Tumor
  • Central Nervous System Depressants / toxicity*
  • Chlorides / pharmacology*
  • Cytochromes c / drug effects
  • Cytochromes c / metabolism
  • Ethanol / toxicity*
  • Fas Ligand Protein / drug effects
  • Fas Ligand Protein / metabolism
  • Gene Expression Regulation / drug effects
  • Glutathione / drug effects
  • Glutathione / metabolism
  • Humans
  • Mitochondria / drug effects
  • Mitochondria / metabolism
  • Oxidative Stress / drug effects
  • Reactive Oxygen Species / metabolism
  • Zinc Compounds / pharmacology*
  • fas Receptor / drug effects
  • fas Receptor / metabolism

Substances

  • Antioxidants
  • Central Nervous System Depressants
  • Chlorides
  • Fas Ligand Protein
  • Reactive Oxygen Species
  • Zinc Compounds
  • fas Receptor
  • Ethanol
  • zinc chloride
  • Cytochromes c
  • Caspase 3
  • Caspase 8
  • Caspase 9
  • Glutathione