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Iron enhancement of ascorbate toxicity.

F K Higson1, R Kohen, M Chevion

  • 1Department of Cellular Biochemistry, Hebrew University of Jerusalem, Israel.

Free Radical Research Communications
|January 1, 1988
PubMed
Summary

Iron and vitamin C (ascorbate) can damage biological molecules. This occurs when iron interacts with macromolecules, generating harmful hydroxyl radicals that cause site-specific damage.

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Area of Science:

  • Biochemistry
  • Toxicology
  • Molecular Biology

Background:

  • Copper ions are known to enhance ascorbate-induced damage to biomolecules.
  • Iron is abundant in biological systems and plays crucial roles, but can also be toxic.

Purpose of the Study:

  • To investigate the role of iron in enhancing ascorbate-induced damage to biological macromolecules.
  • To elucidate the mechanism by which iron and ascorbate interact to cause molecular damage.

Main Methods:

  • Studied the effects of iron and ascorbate on acetylcholine esterase and E. coli B.
  • Proposed a mechanism involving iron-ascorbate interaction and the Fenton reaction.

Main Results:

  • Iron enhances ascorbate-induced damage to acetylcholine esterase and E. coli B.
  • The proposed mechanism suggests iron (II) generates hydroxyl radicals via the Fenton reaction.
  • This process leads to site-specific, multiple-hit damage to biomolecules.

Conclusions:

  • The combination of iron and ascorbate poses a significant toxicological risk.
  • This interaction is particularly relevant in conditions with high iron levels, such as storage disorders.

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