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Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Sci+Rep 2015 ; 5 (ä): ä Nephropedia Template TP
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Electroporation of mammalian cells by nanosecond electric field oscillations and its inhibition by the electric field reversal #MMPMID26348662
Gianulis EC; Lee J; Jiang C; Xiao S; Ibey BL; Pakhomov AG
Sci Rep 2015[]; 5 (ä): ä PMID26348662show ga
The present study compared electroporation efficiency of bipolar and unipolar nanosecond electric field oscillations (NEFO). Bipolar NEFO was a damped sine wave with 140?ns first phase duration at 50% height; the peak amplitude of phases 2?4 decreased to 35%, 12%, and 7% of the first phase. This waveform was rectified to produce unipolar NEFO by cutting off phases 2 and 4. Membrane permeabilization was quantified in CHO and GH3 cells by uptake of a membrane integrity marker dye YO-PRO-1 (YP) and by the membrane conductance increase measured by patch clamp. For treatments with 1?20 unipolar NEFO, at 9.6?24?kV/cm, 10?Hz, the rate and amount of YP uptake were consistently 2-3-fold higher than after bipolar NEFO treatments, despite delivering less energy. However, the threshold amplitude was about 7?kV/cm for both NEFO waveforms. A single 14.4?kV/cm unipolar NEFO caused a 1.5?2 times greater increase in membrane conductance (p?0.05) than bipolar NEFO, along with a longer and less frequent recovery. The lower efficiency of bipolar NEFO was preserved in Ca2+-free conditions and thus cannot be explained by the reversal of electrophoretic flows of Ca2+. Instead, the data indicate that the electric field polarity reversals reduced the pore yield.