Membrane conductance of an electroporated cell analyzed by submicrosecond imaging of transmembrane potential

M. Hibino, M. Shigemori, H. Itoh, K. Nagayama, K. Kinosita*

*この研究の対応する著者

研究成果: Article査読

240 被引用数 (Scopus)

抄録

Transmembrane potential was induced in a sea urchin egg by applying a microsecond electric pulse across the cell. The potential was imaged at a submicrosecond time resolution by staining the cell membrane with the voltage-sensitive fluorescent dye RH292. Under moderate electric fields, the spatial distribution of the induced potential as well as its time dependence were in accord with the theoretical prediction in which the cell membrane was regarded as an insulator. At higher field intensities, however, the potential apparently did not fully develop and tended to saturate above a certain level. The saturation is ascribed to the introduciton of a large electrical conductance, in the form of aqueous openings, in the membrane by the action of the induced potential (electroporation). Comparison of the experimental and theoretical potential profiles indicates that the two regions of the membrnae that opposed the electrodes acquired a high membrane conductance of the order of 1 S/cm2 within 2 μs from the onset of the external field. The conductance was similar in the two regions, although permeability in the two regions of the membrane long after the pulse treatment appeared quite different.

本文言語English
ページ(範囲)209-220
ページ数12
ジャーナルBiophysical Journal
59
1
出版ステータスPublished - 1991
外部発表はい

ASJC Scopus subject areas

  • 生物理学

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