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The central role of metal coordination in selenium antioxidant activity

Erin E Battin1, Nathan R Perron, Julia L Brumaghim

  • 1Department of Chemistry, Clemson University, Clemson, SC 29634-0973, USA.

Inorganic Chemistry
|January 18, 2006
PubMed

Insights

Selenium compounds can prevent oxidative DNA damage. Selenocystine is a potent inhibitor, requiring selenium-copper coordination for its antioxidant activity, offering potential for new disease treatments.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Toxicology

Background:

  • Oxidative DNA damage, primarily from hydroxyl radicals in metal-mediated Fenton-type reactions, contributes to aging and diseases like cancer and neurodegeneration.
  • Antioxidants, particularly potent selenium compounds, are being investigated for therapeutic applications against oxidative stress-related conditions.

Purpose of the Study:

  • To investigate the efficacy of different selenium compounds in inhibiting metal-mediated oxidative DNA damage.
  • To elucidate the mechanism underlying the DNA damage inhibition by selenium compounds, focusing on the role of metal coordination.

Main Methods:

  • Gel electrophoresis was employed to directly quantify DNA damage inhibition induced by selenium compounds in the presence of copper and hydrogen peroxide (H(2)O(2)).
  • UV-visible spectroscopy was used to analyze the interaction and coordination between selenium compounds and copper.

Main Results:

  • Selenocystine demonstrated potent inhibition of DNA damage at low micromolar concentrations.
  • Selenomethionine required concentrations 40 times higher for similar inhibition, while 2-aminophenyl diselenide showed no significant effect.
  • DNA damage inhibition efficacy did not correlate with glutathione peroxidase activity, but selenium-copper coordination was identified as crucial for the antioxidant effect.

Conclusions:

  • Selenium-copper coordination is essential for the potent DNA damage inhibitory activity of certain selenium compounds.
  • This novel mechanism provides a basis for designing more effective selenium-based antioxidants for preventing and treating diseases linked to oxidative stress.

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