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Viability Assays for Cells in Culture
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Selecting the appropriate indirect viability assay for 3D paper-based cultures: a data-driven study.

Zachary R Sitte1, Tyler S Larson1, Julie C McIntosh1

  • 1Department of Chemistry, University of North Carolina at Chapel Hill, Kenan and Caudill Laboratories, 125 South Road, Chapel Hill, NC 27599-3290, USA. mlockett@unc.edu.

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Summary

Evaluating indirect cell viability assays on a paper-based platform, this study found that assay selection is crucial for accurate results, especially under hypoxic conditions. Only one assay remained unaffected by hypoxia, highlighting its importance in cell culture research.

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Area of Science:

  • Cell Biology
  • Assay Development
  • Drug Discovery

Background:

  • Cellular viability assays are crucial for assessing drug efficacy and toxicity.
  • Direct viability measures offer accuracy but are labor-intensive, especially for 3D cell cultures.
  • Indirect viability assays are less labor-intensive but can be less accurate in complex microenvironments.

Purpose of the Study:

  • To evaluate the analytical performance of five indirect cell viability assays.
  • To assess assay compatibility with hypoxic conditions, repeatability, reproducibility, and predictive power for drug potency.
  • To compare these assays within a novel paper-based cell culture platform.

Main Methods:

  • Assessed calcein-AM staining, CellTiter-Glo, fluorescent protein expression, propidium iodide staining, and resazurin assay.
  • Evaluated assays for performance under hypoxia, intra-experimental repeatability, and inter-experimental reproducibility.
  • Determined the ability of each assay to predict antineoplastic drug potency.

Main Results:

  • Each of the five indirect viability assays demonstrated unique benefits and drawbacks.
  • Assay performance varied significantly under hypoxic conditions, with only one assay remaining unaffected.
  • The study identified significant differences in repeatability and reproducibility across the evaluated assays.

Conclusions:

  • The choice of indirect cell viability assay significantly impacts experimental outcomes, particularly in 3D cultures and under hypoxia.
  • Hypoxia is a critical, often overlooked variable that can lead to inaccurate viability measurements.
  • The paper-based platform provides a novel system for assay evaluation, with specific recommendations for assay selection based on experimental needs.