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Mutations01:35

Mutations

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Updated: Jul 15, 2025

Measuring DNA Damage and Repair in Mouse Splenocytes After Chronic In Vivo Exposure to Very Low Doses of Beta- and Gamma-Radiation
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Metal Ions Modify In Vitro DNA Damage Yields with High-LET Radiation.

Dylan J Buglewicz1,2, Cathy Su2, Austin B Banks2

  • 1National Institute of Radiological Sciences, National Institutes of Quantum Science and Technology, Chiba 263-8555, Japan.

Toxics
|September 27, 2023
PubMed
Summary
This summary is machine-generated.

Copper (Cu2+) and cobalt (Co2+) ions enhance DNA damage, particularly with hydrogen peroxide. Their effects are dependent on radiation type and metal, with Cu2+ causing more damage than Co2+.

Keywords:
DNA breaksDNA damageFenton reactioncarbon-ion radiationhigh-LET radiation

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Area of Science:

  • Biochemistry
  • Radiation Biology
  • Genetics

Background:

  • Metal ions like copper (Cu2+) and cobalt (Co2+) can increase DNA damage via Fenton-type reactions with hydrogen peroxide.
  • Hydrogen peroxide is a known product of water radiolysis, suggesting a potential role for these metals in radiation-induced DNA damage.

Purpose of the Study:

  • To investigate the synergistic effect of Cu2+ and Co2+ with radiation and chemical agents on DNA damage.
  • To determine if the DNA-damaging effects of these metals are dependent on the linear energy transfer (LET) of the radiation.

Main Methods:

  • DNA (single- and double-stranded) in solution with Cu2+ or Co2+ was exposed to X-rays (low-LET), carbon-ion (high-LET), or iron-ion (high-LET) radiation.
  • Alternatively, DNA-metal solutions were treated with hydrogen peroxide or bleomycin at varying concentrations.
  • DNA damage was quantified using gel electrophoresis and band intensity analysis.

Main Results:

  • DNA damage was most significant when metals were combined with hydrogen peroxide, followed by irradiation (high-LET > low-LET).
  • Cu2+ consistently induced greater DNA damage than Co2+ across all experimental conditions.
  • The metals' DNA-damaging effect was LET-dependent for single-strand breaks but inversely dependent for double-strand breaks.

Conclusions:

  • Cu2+ is more effective than Co2+ in inducing both single- and double-strand DNA breaks under various radiation and chemical treatment conditions.
  • The findings highlight the role of metal ions in modulating radiation-induced DNA damage, with implications for understanding biological responses to ionizing radiation.