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Related Experiment Videos

A novel cytotoxicity screening assay using a multiwell fluorescence scanner.

A L Nieminen1, G J Gores, J M Bond

  • 1Department of Cell Biology & Anatomy, School of Medicine, University of North Carolina, Chapel Hill 27599-7090.

Toxicology and Applied Pharmacology
|August 1, 1992
PubMed
Summary

A novel propidium iodide assay effectively screens cell death in 96-well plates. Metalloprotease inhibitors and phospholipase inhibitors show significant cytoprotective effects against chemical hypoxia.

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Area of Science:

  • Cell Biology
  • Toxicology
  • Assay Development

Background:

  • Cell death assays are crucial for evaluating drug toxicity and efficacy.
  • Existing methods can be time-consuming or lack high-throughput capabilities.
  • Developing rapid and reliable cytotoxicity screening tools is essential for drug discovery.

Purpose of the Study:

  • To develop and validate a new, high-capacity cytotoxicity assay for screening potential cytoprotective agents.
  • To assess the protective effects of various inhibitors against chemically induced cell death in different cell types.

Main Methods:

  • A multiwell fluorescence scanner-based assay using propidium iodide (PI) to detect cell membrane permeability.
  • Induction of cell death in hepatocytes, cardiac myocytes, and kidney cells via chemical hypoxia (ATP depletion) or toxic chemicals (HgCl2).

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  • Evaluation of cytoprotective agents, including protease, phospholipase, and lipid peroxidation inhibitors.

    • Main Results:

    • The propidium iodide assay demonstrated a progressive increase in fluorescence proportional to cell death, correlating linearly with lactate dehydrogenase release.
    • 1,10-phenanthroline (a metalloprotease inhibitor) provided significant protection against chemical hypoxia-induced cell death.
    • Phospholipase inhibitors (chlorpromazine, mepacrine) also substantially retarded cell killing, while other inhibitors showed limited or no protective effects.

    Conclusions:

    • The developed propidium iodide assay is a robust and high-capacity tool for rapid cytotoxicity screening in 96-well microtiter plates.
    • Metalloprotease and phospholipase inhibition show promise in protecting cells against specific types of cytotoxic injury.
    • This assay facilitates efficient screening of numerous compounds for cytoprotective potential across various cell models.