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Mild iron overload effect on rat liver nuclei

M Galleano1, S Puntarulo

  • 1Physical Chemistry Division, School of Pharmacy and Biochemistry, University of Buenos Aires, Argentina.

Toxicology
|November 11, 1994
PubMed
Summary

Iron overload from iron-dextran treatment significantly increases liver iron. This impacts nuclear function by decreasing antioxidants and oxygen radical generation, affecting cellular nuclei functionality.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Toxicology

Background:

  • Iron is essential for cellular functions but excess iron can be toxic.
  • Iron overload can lead to oxidative stress and cellular damage.
  • The effects of iron overload on liver nuclei functionality are not fully understood.

Purpose of the Study:

  • To investigate the impact of iron overload on liver nuclei functionality.
  • To assess changes in enzymatic activities, antioxidant levels, and reactive oxygen species generation within liver nuclei after iron administration.
  • To determine if iron overload affects the catalytic activity of nuclear enzymes and the integrity of nuclear components.

Main Methods:

  • Administration of iron-dextran to rats to induce iron overload.
  • Isolation of rat liver nuclei for biochemical analysis.
  • Measurement of in vitro nuclear Fe(3+)-EDTA reduction rate.
  • Assay of NADPH- and NADH-dependent cytochrome c reductases and cytochrome P450 activity.
  • Quantification of lipid- and water-soluble antioxidants (alpha-tocopherol, beta-carotene, glutathione) in isolated nuclei.
  • Measurement of superoxide anion, hydrogen peroxide, and hydroxyl radical-like species generation by isolated nuclei.

Main Results:

  • Iron-dextran injection increased iron content in plasma and liver, including liver nuclei.
  • NADPH- and NADH-dependent cytochrome c reductases showed slight decreases; cytochrome P450 became undetectable.
  • Significant reductions in nuclear alpha-tocopherol (40%) and beta-carotene (83%) were observed.
  • Generation of superoxide anion (50%), hydrogen peroxide (40%), and hydroxyl radical-like species (60%) by nuclei decreased.
  • In vitro nuclear Fe(3+)-EDTA reduction rate remained unaffected.

Conclusions:

  • Iron overload leads to significant alterations in liver nuclei functionality.
  • The observed decrease in antioxidants and reactive oxygen species generation suggests a complex response to iron overload.
  • Inactivation of nuclear cytochrome P450 and loss of lipid-soluble antioxidants indicate potential disruption of nuclear processes by excess catalytic iron.

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