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The Soft Agar Colony Formation Assay
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An improved method for staining cell colonies in clonogenic assays.

Kishore Guda1, Leanna Natale, Sanford D Markowitz

  • 1Department of Medicine, Case Western Reserve University, University Hospitals of Cleveland, 2103 Cornell road, Wolstein Research Building- 3rd Floor, Mailstop 3101, Cleveland, OH, 44106, USA, gkishore@yahoo.com.

Cytotechnology
|November 13, 2008
PubMed
Summary

A novel Ethidium bromide (ETeB) staining method enhances cell colony visualization in clonogenic assays. This rapid, wash-free protocol improves accuracy, especially on collagen substrates, aiding drug and gene effect studies.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biotechnology

Background:

  • Clonogenic assays are crucial for evaluating drug/gene effects on cell proliferation in vitro.
  • Accurate colony counting is essential for reliable quantitation of treatment outcomes.
  • Existing staining methods can be suboptimal, particularly on specialized substrates like collagen.

Purpose of the Study:

  • To introduce and validate a novel staining method, Ethidium bromide (ETeB), for cell colonies in clonogenic assays.
  • To compare the efficacy of ETeB with traditional methylene blue staining.
  • To highlight the advantages of ETeB for improved colony visualization and quantitation.

Main Methods:

  • Developed and applied the ETeB staining protocol to colon cancer cell lines cultured on plastic and collagen-coated surfaces.

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  • Compared ETeB staining efficiency against methylene blue.
  • Evaluated key features including background reduction, staining time, washing steps, and visualization methods.

    • Main Results:

    • ETeB staining demonstrated effectiveness on both plastic and collagen substrates.
    • ETeB significantly outperformed methylene blue in staining colonies on collagen, reducing background.
    • The ETeB protocol is rapid (<1 minute), requires no post-stain washing, and allows immediate visualization.
    • The method is compatible with standard UV illumination and software for colony counting across diverse cell lines.

    Conclusions:

    • The ETeB staining method offers a simple, rapid, and robust approach for visualizing and quantifying cell colonies in clonogenic assays.
    • ETeB provides superior performance on collagen substrates compared to methylene blue, enhancing experimental accuracy.
    • This technique is suitable for various cell lines and scales, from small to large-scale experiments.