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Related Experiment Video

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The Fabrication and Operation of a Continuous Flow, Micro-Electroporation System with Permeabilization Detection

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Identification of in vitro electropermeabilization equivalent pulse protocols.

A Ongaro¹, A Pellati, A Caruso

¹Department of Morphology and Embryology, University of Ferrara, Via Fossato di Mortara 64/B, 44121 Ferrara, Italy. ngrlss@unife.it

Technology in Cancer Research & Treatment

|September 8, 2011

Summary

Electropermeabilization, a process using electric fields to create cell membrane pores for drug delivery, can be achieved with fewer high-voltage pulses by using more low-voltage pulses. This finding offers new options for clinical electrotransfer applications.

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Area of Science:

Biophysics
Cell Biology
Biomedical Engineering

Background:

Electric fields induce pores in cell membranes, a process known as electropermeabilization.
Electropermeabilization facilitates the entry of molecules into cells, crucial for drug delivery.
The standard ESOPE protocol uses high electric field amplitude and a specific pulse number for clinical drug electrotransfer.

Purpose of the Study:

To explore alternative electropermeabilization protocols using varying electric field amplitudes and pulse numbers.
To determine if lower electric field strengths combined with more pulses can achieve similar electropermeabilization to the ESOPE protocol.
To investigate the relationship between electric field parameters and cell membrane permeabilization.

Main Methods:

MG63 cells were exposed to electric fields ranging from 300 to 1000 V/cm with pulse numbers from 8 to 320.
Propidium iodide and Calcein blue AM uptake assays were employed to assess electropermeabilization and cell viability.
Statistical analysis was performed to evaluate the correlation between electric field parameters and observed effects.

Main Results:

A significant inverse correlation was found between electric field strength and the number of pulses required for electropermeabilization (r² = 0.92, p<0.0001).
The threshold absorbed dose for electropermeabilization was dependent on the number of pulses for each applied voltage (r² = 0.96, p<0.0001).
Lower electric field amplitudes combined with a higher number of pulses effectively induced cell membrane permeabilization.

Conclusions:

Electropermeabilization can be achieved by modulating the number of pulses, offering an alternative to increasing electric field amplitude.
This flexibility in pulse parameters provides a valuable strategy for optimizing electropermeabilization in clinical settings.
The findings suggest potential improvements for drug electrotransfer and other electropermeabilization-related medical applications.