Emergence of a large pore subpopulation during electroporating pulses

作者：Smith Kyle C; Son Reuben S; Gowrishankar T R; Weaver James C^*

来源：Bioelectrochemistry, 2014, 100: 3-10.

DOI：10.1016/j.bioelechem.2013.10.009

• Electroporation
• Pore population
• System model
• Thermal broadening
• Mechanism

Electroporation increases ionic and molecular transport through cell membranes by creating transient aqueous pores. These pores cannot be directly observed experimentally, but cell system modeling with dynamic electroporation predicts pore populations that produce cellular responses consistent with experiments. We show a cell system models response that illustrates the life cycle of a pore population in response to a widely used 1 kV/cm, 100 mu s trapezoidal pulse. Rapid pore creation occurs early in the pulse, followed by the gradual emergence of a subpopulation of large pores reaching similar to 30 nm radius. After the pulse, pores rapidly contract to form a single thermally broadened distribution of small pores (similar to 1 nm radius) that slowly decays. We also show the response of the same model to pulses of 100 ns to 1 ms duration, each with an applied field strength adjusted such that a total of 10,000 +/- 100 pores are created. As pulse duration is increased, the pore size distributions vary dramatically and a distinct subpopulation of large pores emerges for pulses of microsecond and longer duration. This subpopulation of transient large pores is relevant to understanding rapid transport of macromolecules into and out of cells during a pulse.

• 出版日期2014-12