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Related Experiment Videos

Directed cell movement in pulsed electric fields

K Franke1, H Gruler

  • 1Abteilung Biophysik, Universität Ulm, Bundesrepublik Deutschland.

Zeitschrift Fur Naturforschung. C, Journal of Biosciences
|March 1, 1994
PubMed
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Pulsed electric fields can guide human granulocytes, but only when the field has a non-zero average. A specific pulse repetition time of 8 seconds enhanced this directed cell movement.

Area of Science:

  • Electrobiology
  • Cellular Biophysics
  • Immunology

Background:

  • Human granulocytes are key immune cells involved in inflammatory responses.
  • Understanding cellular responses to external stimuli like electric fields is crucial for biomedical applications.
  • Previous research has explored electric field effects on various cell types.

Purpose of the Study:

  • To investigate the directed movement (trajectories) of human granulocytes when exposed to pulsed electric guiding fields.
  • To determine the influence of pulsed electric field characteristics, such as average field strength and pulse repetition time, on granulocyte response.
  • To analyze the time delay between signal detection and cellular reaction.

Main Methods:

  • Human granulocytes were subjected to pulsed electric guiding fields.

Related Experiment Videos

  • Cellular trajectories were captured and analyzed using digitized phase contrast microscopy.
  • Different pulsed electric field parameters, including zero and non-zero averaged fields and varying repetition times, were tested.

    • Main Results:

    • Pulsed electric fields with a zero averaged field did not induce directed movement in granulocytes.
    • A directed cellular response was observed when exposed to pulsed electric fields with a non-zero averaged field.
    • The directed response was significantly enhanced with a pulse repetition time of 8 seconds, and the lag-time for response was 8-10 seconds.

    Conclusions:

    • The average field strength of pulsed electric fields is critical for inducing directed migration of human granulocytes.
    • Specific pulse parameters, like an 8-second repetition time, can optimize this electrotactic response.
    • The findings support a self-ignition model for explaining granulocyte electrotaxis.