A subnanosecond electric pulse exposure system for biological cells

Area of Science:

• Biophysics
• Cell Biology
• Electrical Engineering

Background:

• Studying cellular responses to electrical fields requires precise control over pulse parameters.
• Existing methods may lack the resolution or field strength for certain cellular investigations.

Purpose of the Study:

• To develop and validate a novel microscope-stage exposure system for applying high electric field, subnanosecond pulses to biological cells.
• To investigate the effects of these pulses on cell membrane potential.

Main Methods:

• Constructed a specialized exposure system with a 3 GHz bandpass on a microscope stage.
• Utilized high-voltage (6.2 kV) pulses delivered via a π network to tungsten rod electrodes (170 μm gap).
• Achieved electric fields up to 200 kV/cm with 500 ps pulse duration, ensuring field homogeneity over 50-70 μm.

Main Results:

• Successfully generated high electric fields and short-duration pulses at the microscope stage.
• Demonstrated homogenous electric fields suitable for cellular studies.
• Observed and demonstrated, for the first time, the depolarization of neuroblastoma cell membrane potential.

Conclusions:

• The developed system enables unprecedented studies of cellular responses to high electric field, subnanosecond pulses.
• This technology opens new avenues for investigating electroporation and other electrical field-induced cellular phenomena.
• The ability to induce and observe membrane potential changes provides critical insights into cell electrophysiology.