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The human epithelial cell cytotoxicity assay for determining tissue specific toxicity: method modifications.

Eugene Elmore1, Shazia Siddiqui, Neeraj Desai

  • 1Department of Radiation Oncology and Chao Family Comprehensive Cancer Center, University of California, Medical Sciences I, B149, Irvine, CA 92697, USA. eelmore@uci.edu

Methods in Cell Science : an Official Journal of the Society for in Vitro Biology
|July 5, 2003
PubMed
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The Human Epithelial Cell Cytotoxicity (HECC) Assay was enhanced to test more cell types and slow-growing cells. This assay helps determine the toxicity of various agents on human epithelial cells from different tissues.

Area of Science:

  • Toxicology
  • Cell Biology
  • Drug Discovery

Background:

  • The Human Epithelial Cell Cytotoxicity (HECC) Assay is a valuable tool for assessing chemical toxicity.
  • Previous versions of the HECC Assay had limitations in the number of cell lines and adaptability for slow-growing cells.

Purpose of the Study:

  • To present modified methods for the HECC Assay, expanding its utility.
  • To incorporate additional human epithelial cell lines and adapt protocols for slow-growing cell types.
  • To enable broader application of the HECC Assay for evaluating diverse agents.

Main Methods:

  • Utilized human epithelial cells from ten distinct normal human tissues (skin, mammary, prostate, renal, bronchial, lung, oral, ecto-cervix, colon, liver).
  • Modified the HECC Assay protocol to accommodate slow-growing cell lines.

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  • Exposed cells to multiple concentrations of test agents for 3-4 days.
  • Measured endpoints including growth inhibition, mitochondrial function, PCNA expression, or albumin synthesis.
  • Determined the 50% inhibitory concentration (TC(50)) for each agent and cell line.

    • Main Results:

    • The enhanced HECC Assay successfully incorporates three additional cell lines.
    • Protocols were adjusted to effectively assess slow-growing human epithelial cell lines.
    • The assay allows for the determination of relative sensitivity of different epithelial cell types to various test agents.

    Conclusions:

    • The modified HECC Assay provides a more comprehensive platform for evaluating the cytotoxicity of drugs, personal care products, environmental chemicals, and toxicants.
    • This expanded assay facilitates a deeper understanding of tissue-specific epithelial cell responses to chemical exposure.
    • The methodology enables comparative analysis of agent toxicity across a wider range of human epithelial cell types.