Numerical simulation of molecular uptake via electroporation

Area of Science:

• Biophysics
• Computational Biology
• Cellular Electroporation

Background:

• Electroporation is a key technique for molecular delivery into cells.
• Understanding the physical mechanisms governing ion transport during electroporation is crucial for optimizing delivery efficiency.

Purpose of the Study:

• To numerically investigate electroporation-mediated molecular delivery.
• To elucidate the roles of electrophoresis and diffusion in ion transport.
• To explore the relationship between extracellular conductivity and intracellular ion concentration.

Main Methods:

• Numerical simulation using Nernst-Planck equations for species transport.
• Coupling with an asymptotic Smoluchowski equation for membrane permeabilization.
• Simulation of calcium ion transfer into Chinese Hamster Ovary cells.

Main Results:

• Ion electrophoresis is significantly faster than diffusion in this context.
• Maximum intracellular ion concentration is inversely proportional to extracellular electrical conductivity.
• Field-amplified sample stacking drives higher intracellular concentrations when conductivity ratios favor it.

Conclusions:

• Electrophoresis is a dominant factor in electroporation-mediated ion delivery.
• Extracellular conductivity and conductivity ratios critically influence intracellular ion accumulation.
• The study provides mechanistic insights into molecular delivery via electroporation, aiding future quantification.