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HPLC Measurement of the DNA Oxidation Biomarker, 8-oxo-7,8-dihydro-2’-deoxyguanosine, in Cultured Cells and Animal Tissues
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HPLC Measurement of the DNA Oxidation Biomarker, 8-oxo-7,8-dihydro-2’-deoxyguanosine, in Cultured Cells and Animal Tissues

Published on: August 1, 2015

Inhibition of antimutagenic enzymes, 8-oxo-dGTPases, by carcinogenic metals. Recent developments

K S Kasprzak1, K Bialkowski

  • 1Laboratory of Comparative Carcinogenesis, National Cancer Institute, Frederick Cancer Research and Development Center, MD 21702-1201, USA. kasprkaz@mail.ncifcrf.gov

Journal of Inorganic Biochemistry
|June 1, 2000
PubMed

Insights

Heavy metals like cadmium and copper can cause cancer by damaging DNA. This study shows they inhibit enzymes that prevent such damage, leading to increased DNA mutations.

Area of Science:

  • Environmental toxicology
  • Molecular biology
  • Carcinogenesis mechanisms

Background:

  • Nickel, cadmium, cobalt, and copper are known carcinogens with unclear mechanisms.
  • Oxidative damage to DNA bases is a potential mechanism mediated by these metals.
  • 8-oxo-2'-deoxyguanosine 5'-triphosphate pyrophosphatases (8-oxo-dGTPases) prevent incorporation of damaged bases into DNA.

Purpose of the Study:

  • To investigate the inhibitory effects of cadmium, copper, nickel, and cobalt on 8-oxo-dGTPase activity.
  • To confirm the role of 8-oxo-dGTPase inhibition in cadmium-induced carcinogenesis in cellular and animal models.

Main Methods:

  • Assessing the impact of Cd(II), Cu(II), Co(II), and Ni(II) on isolated bacterial and human 8-oxo-dGTPases.
  • Developing and utilizing an assay for 8-oxo-dGTPase activity in cultured cells and rat testes.
  • Measuring 8-oxo-dG levels in testicular DNA.

Main Results:

  • Cadmium (Cd(II)) and copper (Cu(II)) strongly inhibited 8-oxo-dGTPase activity.
  • Nickel (Ni(II)) and cobalt (Co(II)) showed weaker inhibition of 8-oxo-dGTPase.
  • Cadmium-induced 8-oxo-dGTPase inhibition in vivo correlated with increased 8-oxo-dG levels in rat testicular DNA.

Conclusions:

  • Inhibition of 8-oxo-dGTPases by metals like cadmium and copper is a key mechanism in metal-induced carcinogenesis.
  • This inhibition leads to the incorporation of damaged DNA bases, promoting mutations.
  • Targeting 8-oxo-dGTPases could be a strategy for cancer prevention or treatment.

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