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Alloxan cytotoxicity involves lysosomal damage.

H Zhang1, J M Zdolsek, U T Brunk

  • 1Department of Pathology II, Faculty of Health Sciences, Linköping University, Sweden.

APMIS : Acta Pathologica, Microbiologica, Et Immunologica Scandinavica
|April 1, 1992
PubMed
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Alloxan causes rapid cell damage by creating harmful oxygen-free radicals inside cells, leading to lysosomal breakdown and cell death. Depleting glutathione increases cell sensitivity to alloxan toxicity.

Area of Science:

  • Cell Biology
  • Toxicology
  • Biochemistry

Background:

  • The precise mechanisms of alloxan-induced cytotoxicity are not fully understood.
  • Cytotoxicity is thought to involve oxygen-derived free radicals generated after alloxan reduction.
  • These reactive species can damage cellular macromolecules both extra- and intracellularly.

Purpose of the Study:

  • To investigate the early intracellular effects of alloxan on macrophage-like cells.
  • To elucidate the specific pathways of alloxan-induced cell damage in a cellular model.

Main Methods:

  • Macrophage-like cells in culture were exposed to alloxan (15 mM) in phosphate-buffered saline (PBS) at 37°C, pH 7.4.
  • Cells were pretreated with buthionine sulfoximine (BSO) to deplete intracellular glutathione levels.

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  • Cellular damage was assessed by monitoring lysosomal integrity, cell morphology, and cell viability using the trypan blue exclusion test.

    • Main Results:

    • Alloxan rapidly induced lysosomal damage, evidenced by the disappearance of the lysosomal proton gradient.
    • Severe cellular degeneration, including swelling and blebbing, and 50% cell death occurred within 50 minutes.
    • Cells pretreated with BSO to reduce glutathione levels exhibited increased sensitivity to alloxan.

    Conclusions:

    • Alloxan cytotoxicity results from the intracellular generation of reactive oxygen species, including superoxide radicals, hydrogen peroxide, and hydroxyl radicals.
    • Hydroxyl radical formation likely occurs within secondary lysosomes via Fenton reactions involving trace iron.
    • Lysosomal membrane damage leads to the leakage of hydrolases, contributing to further cellular degeneration and death.