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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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A Promising Method for the Determination of Cell Viability: The Membrane Potential Cell Viability Assay.

Eneko Madorran1,2,3, Andraž Stožer4, Zoran Arsov5,6

  • 1Institute of Anatomy, Faculty of Medicine, University of Maribor, Taborska Ulica 8, 2000 Maribor, Slovenia.

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A novel method directly measures cell membrane electrical potential to determine cell viability. This approach offers accurate cell death assessment and compatibility with live cell imaging, promising broader applications.

Keywords:
cell culturecell deathcell viabilitymembrane potential

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Area of Science:

  • Cell Biology
  • Biophysics
  • Toxicology

Background:

  • Accurate cell viability determination is challenging, with current methods often relying on indirect indicators of cell death.
  • Existing assays for cell viability assessment include metabolism, molecular transport, and leakage measurements.
  • There is a need for direct and reliable methods to assess cell health and death.

Purpose of the Study:

  • To develop and validate a novel, direct method for assessing cell viability.
  • To evaluate the assay's accuracy and applicability across different cell types and toxic conditions.
  • To explore the compatibility of the new method with live cell imaging techniques.

Main Methods:

  • Developed a novel assay measuring the electrical potential of the cell membrane to directly assess cell viability.
  • Tested the assay on two cell types: blood macrophages (TLT) and breast cancer epithelial cells (MCF 7).
  • Exposed cells to seven toxic agents (arsenic (V), UV light, hydrogen peroxide, nutrient starvation, Tetrabromobisphenol A, fatty acids, and 5-fluorouracil) to induce cell death.

Main Results:

  • The novel cell viability assay demonstrated good accuracy in toxicity assessment compared to established methods.
  • The method proved compatible with live cell imaging, allowing for real-time observation.
  • The assay effectively distinguished between viable and non-viable cells under various toxic challenges.

Conclusions:

  • The direct measurement of cell membrane electrical potential is a promising approach for determining cell viability.
  • This novel assay offers a more direct and potentially more accurate alternative to indirect methods.
  • Further studies are warranted to confirm the assay's performance across a wider range of biological contexts and applications.