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Cell-based quantitative evaluation of the MTT assay.

Beatriz L Molinari1, Débora R Tasat, Mónica A Palmieri

  • 1National Research Council and Radiobiology Department, National Laboratories of Research and Service-Conicet, National Atomic Energy Commission, Avda. Gral. Paz 1499, (1650) San Martín, Pcia Buenos Aires, Argentina. beamolin@cnea.gov.ar

Analytical and Quantitative Cytology and Histology
|November 8, 2003
PubMed
Summary

The MTT assay

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Area of Science:

  • Cell biology
  • Biochemistry
  • Cytometry

Background:

  • The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay is widely used to assess cell metabolic activity.
  • Cellular heterogeneity in size and metabolic state can influence MTT assay results.
  • Quantifying MTT bioreduction at the single-cell level is crucial for accurate analysis.

Purpose of the Study:

  • To analyze 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) bioreduction on a per-cell basis.
  • To evaluate how cell metabolism stages modulate MTT bioreduction.
  • To assess MTT assay utility at the single-cell level.

Main Methods:

  • Digital image analysis was employed to record total optical density (TOD), cell area, and specific activity (TOD/area) for individual V79 cells and macrophages.

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  • The modulation of MTT-specific activity was investigated using varying concentrations of serum and genistein.

    • Main Results:

    • Formazan production per cell during MTT bioreduction was found to be directly proportional to cell size.
    • Cell size heterogeneity significantly impacts the total formazan produced per culture dish.
    • MTT-specific activity varied between phagocytic and non-phagocytic cells.

    Conclusions:

    • MTT bioreduction is cell-size dependent, impacting total assay output.
    • Analyzing MTT activity at the single-cell level provides a more nuanced understanding of cell metabolism.
    • This approach enhances the utility of the MTT assay for evaluating cellular responses.