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Related Experiment Videos

Controlling cell destruction using dielectrophoretic forces.

A Menachery1, R Pethig

  • 1School of Informatics, University of Wales, Bangor, Gwynedd, LL57 1UT, UK.

IEE Proceedings. Nanobiotechnology
|January 31, 2006
PubMed
Summary

Dielectrophoresis (DEP) experiments reveal a specific frequency window that impacts cell destruction. This window, dependent on cell type, can be used to either minimize or maximize cell damage during DEP manipulation.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Electrical Engineering

Background:

  • Dielectrophoresis (DEP) is a technique used to manipulate cells using non-uniform electric fields.
  • Cellular responses to DEP are influenced by factors such as AC voltage frequency, magnitude, and cell properties.
  • Understanding these influences is crucial for optimizing DEP applications in cell analysis and manipulation.

Purpose of the Study:

  • To investigate the influence of AC voltage frequency and magnitude on cell destruction during dielectrophoresis (DEP).
  • To identify a specific field-frequency window that affects cell damage in Jurkat T cells and HL60 leukemia cells.
  • To explore the potential of this window for either minimizing or selectively destroying cells.

Main Methods:

  • Utilized microelectrodes with interdigitated and quadrupolar geometries.
  • Performed dielectrophoresis experiments on Jurkat T cells and HL60 leukemia cells.
  • Measured cell destruction as a function of AC voltage frequency and magnitude.

Main Results:

  • Identified a critical field-frequency window influencing cell destruction.
  • Determined that this window's characteristics (width, location) depend on cell type (size, morphology, dielectric properties).
  • Demonstrated that cell destruction can be minimized by avoiding positive DEP at electrode edges within this window, or exploited for selective cell destruction.

Conclusions:

  • A specific field-frequency window exists that dictates cell damage during DEP.
  • This window is bounded by the DEP cross-over frequency and a frequency related to the cell membrane's time constant.
  • The findings enable precise control over cell fate in DEP, allowing for either cell protection or targeted elimination in mixed populations.

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