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Cell membrane electropermeabilization by symmetrical bipolar rectangular pulses. Part I. Increased efficiency of
1Faculty of Electrical Engineering, University of Ljubljana, SI-1000 Ljubljana, Slovenia. tadej@svarun.fe.uni-lj.si
Bioelectrochemistry (Amsterdam, Netherlands)
|August 17, 2001
Summary
Symmetrical bipolar electric pulses enhance cell membrane permeabilization and substance uptake more effectively than unipolar pulses. This advancement in electropermeabilization offers a promising alternative for various biological applications.
Area of Science:
- Cell biology
- Biophysics
- Biotechnology
Background:
- Electroporation, or electropermeabilization, is crucial for cellular manipulation.
- Unipolar pulse parameters are well-studied, but bipolar pulse applications are less explored due to equipment limitations.
Purpose of the Study:
- To compare the efficacy of unipolar and symmetrical bipolar electric pulses for cell electropermeabilization.
- To investigate the impact of bipolar pulses on cell membrane permeability and viability.
Main Methods:
- Development of a custom high-voltage bipolar pulse generator.
- Comparative analysis of cell electropermeabilization using unipolar and bipolar pulse parameters.
- Quantification of lucifer yellow uptake as a measure of permeabilization.
Main Results:
- Symmetrical bipolar pulses required approximately 20% lower amplitude for 50% cell permeabilization compared to unipolar pulses.
- No significant difference in cell death rates was observed between unipolar and bipolar pulses.
- Bipolar pulses increased lucifer yellow uptake by over 20%.
Conclusions:
- Bipolar pulses offer enhanced electropermeabilization efficiency by counteracting cellular asymmetry and improving the chances of permeating diverse cell types.
- The findings suggest bipolar pulse generators could become predominant in cell membrane electropermeabilization, potentially extending to tissue applications.