Cell-substrate impedance fluctuations of single amoeboid cells encode cell-shape and adhesion dynamics
Helmar Leonhardt1, Matthias Gerhardt1, Nadine Höppner2
1Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht Strasse 24/25, 14476 Potsdam, Germany.
Physical Review. E
|February 13, 2016
Summary
Electrical impedance measurements reveal cell-substrate interactions in motile cells. Stronger adhesion correlates with more dynamic cell behavior and impedance fluctuations, offering insights into cell mechanics.
Area of Science:
- Cell biology
- Biophysics
- Electrical impedance spectroscopy
Background:
- Understanding cell-substrate interactions is crucial for cell motility and behavior.
- Electrical impedance spectroscopy (EIS) offers a label-free method to probe cellular properties.
Purpose of the Study:
- To investigate the relationship between cell-substrate adhesion strength and dynamic cell behavior using electrical impedance.
- To correlate impedance signal variations with cell shape oscillations and adhesion dynamics.
Main Methods:
- Systematic electrical impedance measurements of single motile cells on microelectrodes.
- Time-lapse microscopy to record projected cell area and observe cell shape oscillations.
- Analysis of long-term impedance trends and superimposed fluctuations.
Main Results:
- Observed irregular cell shape oscillations correlated with long-term impedance variations.
- Fluctuations in the impedance signal were directly correlated with cell-substrate adhesion strength.
- Strongly adherent cells exhibited more dynamic cell-substrate interactions.
Conclusions:
- Electrical impedance measurements can detect dynamic cell-substrate interactions.
- Adhesion strength significantly influences the impedance response of motile cells.
- This technique provides a sensitive method to study cell mechanics and adhesion in real-time.
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