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Cell Electrosensitization Exists Only in Certain Electroporation Buffers.

Janja Dermol1, Olga N Pakhomova2, Andrei G Pakhomov2

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Electroporation-induced cell sensitization, a delayed hypersensitivity to electric pulses, was observed in growth medium but not other buffers. Its mechanisms remain unclear, suggesting buffer-dependent processes.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Biomedical Engineering

Background:

  • Electroporation uses electric pulses to increase cell membrane permeability.
  • Electroporation-induced cell sensitization is a phenomenon where cells become more sensitive to subsequent electric pulses.
  • Potential applications include electrochemotherapy and irreversible electroporation for tissue ablation.

Purpose of the Study:

  • To investigate the dynamics of electroporation-induced cell sensitization.
  • To identify the underlying mechanisms and buffer dependency of cell sensitization.
  • To explore the impact of varying pulse trains and delays on cell uptake.

Main Methods:

  • Cells were pretreated with electric pulses in five different electroporation buffers.
  • Pulse trains were split, with varying delays between them, to measure propidium uptake.
  • Fluorescence microscopy and first-order model fitting were used to quantify uptake and resealing constants.

Main Results:

  • Cell sensitization was observed exclusively in the growth medium buffer.
  • No sensitization was detected in other tested electroporation buffers.
  • Factors like pulse repetition frequency, cell size, cytoskeleton, and calcium influx did not fully explain the observed sensitization.

Conclusions:

  • Electroporation-induced cell sensitization is a complex phenomenon dependent on the electroporation buffer.
  • The underlying mechanisms are multifactorial and require further investigation.
  • The generality of cell sensitization needs to be determined across various conditions and cell types.