Cited by 101Metal-Catalyzed Oxygenation MechanismsFree Radicals and AntioxidantsRedox biology and oxidative stress

Oxygen‐based free radical generation by ferrous ions and deferoxamine

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Klebanoff, S J, Waltersdorph, A M, Michel, B R, Rosen, H·1989·Journal of Biological Chemistry

Abstract

Deferoxamine accelerates the autooxidation of iron as measured by the rapid disappearance of Fe2+, the associated appearance of Fe3+, and the uptake of oxygen. Protons are released in the reaction. The formation of H2O2 was detected by the horseradish peroxidase-catalyzed oxidation of scopoletin, and the formation of hydroxyl radicals (OH.) was suggested by the formation of the OH. spin trap adduct (DMPO/OH). with the spin trap 5,5-dimethyl-1-pyrroline N-oxide (DMPO) and the generation of the methyl radical adduct on the further addition of dimethyl sulfoxide. (DMPO/OH). adduct formation was inhibited by catalase but not by superoxide dismutase. The oxidant formed converted iodide to a trichloroacetic acid-precipitable form (iodination) and was bactericidal to logarithmic phase Escherichia coli. Both iodination and bactericidal activity was inhibited by catalase and by OH. scavengers, but not by superoxide dismutase. Iodination was optimal in 5 x 10(-4) M acetate buffer, pH 5.0, and when the Fe2+ and deferoxamine concentrations were equimolar at 10(-4) M. Fe2+ could not be replaced by Fe3+, Co2+, Zn2+, Ca2+, Mg2+, or Mn2+, or deferoxamine by EDTA, diethylenetriaminepentaacetic acid, or bathophenanthroline. These findings indicate that Fe2+ and deferoxamine can act as an oxygen radical generating system, which may contribute to its biological effects in vitro and in vivo.

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Crossref · 10.1016/s0021-9258(19)47178-0

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  • NOX2 consists of five catalytic subunits, which assemble after phagocytosis forming an active enzymatic complex producing superoxide anions and hydrogen peroxide along with the formation of hydroxyl radicals, the latter pathway being catalyzed by iron via the Fenton reaction.

    “NOX2 consists of five catalytic subunits, which assemble after phagocytosis thereby forming an active enzymatic complex producing superoxide anions and hydrogen peroxide along with the formation of hydroxyl radicals, the latter pathway being catalyzed by iron via the Fenton reaction (56, 59–61).”

    From Macrophage defense mechanisms against intracellular bacteria (2015) · cites this paper as [59]

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Authors
Klebanoff, S. J., Waltersdorph, A. M., Michel, B. R., & Rosen, H.
Affiliations
University of Washington (US)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1989-11
Volume
264
Issue
33
Pages
19765-19771
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1519672169
Cited by
101
References
49
Citations by year
2025: 1 · 2024: 1 · 2021: 1 · 2020: 4 · 2018: 1 · 2017: 2 · 2016: 1 · 2015: 2 · 2014: 4 · 2012: 3
FWCI
12.89
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
National Institute of Allergy and Infectious Diseases (AI-25606, AI 07763)
Topics
  • Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
  • Physical Sciences › Chemistry › Organic Chemistry › Free Radicals and Antioxidants
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
deferoxamine, ferrous ions, oxygen free radicals, hydroxyl radicals, hydrogen peroxide, catalase, superoxide dismutase, iodination, iron chelation
MeSH terms
Catalase, Cations, Divalent, Deferoxamine, Electron Spin Resonance Spectroscopy, Free Radicals, Hydrogen Peroxide, Iron, Kinetics, Oxidation-Reduction, Superoxide Dismutase

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