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Impairment of antioxidant defenses as a contributor to arsenite-induced cell transformation

Jing Wu1, Anna Sowinska, Xi Huang

  • 1Department of Environmental Medicine, New York University School of Medicine, New York, NY 10016, USA. wuj04@nyumc.org

Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
|June 14, 2012
PubMed

Insights

Low-dose arsenite exposure transforms human cells by impairing antioxidant defenses, decreasing superoxide dismutase 1 (SOD1) and p53 levels. Antioxidant treatment protected against arsenite-induced cell transformation.

Area of Science:

  • Toxicology
  • Cell Biology
  • Biochemistry

Background:

  • Arsenite (As) is a known carcinogen that can transform human cells.
  • The mechanisms underlying arsenite-induced cell transformation remain largely unknown.
  • Antioxidant defense systems play a crucial role in cellular protection against toxic insults.

Purpose of the Study:

  • To investigate the role of antioxidant defense proteins in arsenite-induced human cell transformation.
  • To examine the impact of arsenite on gene expression and protein levels of key antioxidant enzymes.
  • To elucidate the involvement of the p53 pathway in arsenite-induced cellular changes.

Main Methods:

  • Human osteogenic sarcoma cells (HOS) were exposed to low-dose arsenite (0.1-0.5 μM) for 8 weeks.
  • Gene expression and protein levels of superoxide dismutase 1 (SOD1), ferritin, p53, and pig3 were analyzed.
  • The effects of NQO1 inhibition (dicumarol) and antioxidant treatment (caffeic acid phenethyl ester) were evaluated.

Main Results:

  • Arsenite exposure led to increased cell proliferation and decreased antioxidant defenses (SOD1, ferritin).
  • Both mRNA and protein levels of the tumor suppressor p53 were significantly reduced.
  • NQO1 inhibition decreased p53 levels, while antioxidant treatment prevented arsenite-induced reductions in SOD1, p53, and ferritin.

Conclusions:

  • Impairment of antioxidant defenses contributes to arsenite-induced human cell transformation.
  • The p53 pathway is implicated in the cellular response to arsenite exposure.
  • Maintaining antioxidant balance is critical for preventing arsenite-mediated cellular transformation.

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