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Related Experiment Videos

Disulfide cytotoxicity under hypoxia

D L Kirkpatrick1, I A Sa'da, W Chernoff

  • 1Department of Chemistry, University of Regina, Saskatchewan, Canada.

Oncology Research
|January 1, 1994
PubMed
Summary
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The disulfide n-butyl 2-imidazolyl disulfide (III-2) causes cell death by disrupting redox balance and calcium homeostasis. Hypoxia exacerbates its apoptotic effects on cells.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Toxicology

Background:

  • Disulfide compounds can impact cellular functions.
  • Cellular redox state and calcium (Ca2+) homeostasis are critical for cell viability.
  • Hypoxia can alter cellular responses to chemical agents.

Purpose of the Study:

  • To investigate the cytotoxic mechanisms of n-butyl 2-imidazolyl disulfide (III-2).
  • To determine the role of cellular redox state and Ca2+ homeostasis in III-2 cytotoxicity.
  • To assess the influence of hypoxic conditions on III-2's effects.

Main Methods:

  • Exposure of EMT6 and HL60 cells to III-2 under oxic and hypoxic conditions.
  • Measurement of thiol levels (nonprotein and protein).
  • Assay of glutathione S-transferase and glutathione reductase enzyme activity.

Related Experiment Videos

  • Monitoring of intracellular and mitochondrial Ca2+ levels.
  • Evaluation of apoptosis through morphologic changes and DNA laddering.

    • Main Results:

    • III-2 disrupted cellular redox state, depleting thiols.
    • Ca2+ homeostasis was perturbed, with initial cytoplasmic accumulation followed by net cellular Ca2+ loss.
    • Glutathione S-transferase and reductase inhibition was greater under hypoxia.
    • III-2 induced apoptosis in HL60 cells, with enhanced effects under hypoxia.

    Conclusions:

    • III-2 cytotoxicity stems from redox disruption and Ca2+ homeostasis imbalance.
    • Hypoxia potentiates III-2-induced apoptosis, potentially via altered redox or Ca2+ signaling.
    • These findings highlight III-2 as a potential agent affecting cellular viability through specific biochemical pathways.