title: Electrosensitization assists cell ablation by nanosecond pulsed electric field in 3D cultures.
abstract: Previous studies reported a delayed increase of sensitivity to electroporation (termed "electrosensitization") in mammalian cells that had been subjected to electroporation. Electrosensitization facilitated membrane permeabilization and reduced survival in cell suspensions when the electric pulse treatments were split in fractions. The present study was aimed to visualize the effect of sensitization and establish its utility for cell ablation. We used KLN 205 squamous carcinoma cells embedded in an agarose gel and cell spheroids in Matrigel. A local ablation was created by a train of 200 to 600 of 300-ns pulses (50 Hz, 300-600 V) delivered by a two-needle probe with 1-mm inter-electrode distance. In order to facilitate ablation by engaging electrosensitization, the train was split in two identical fractions applied with a 2- to 480-s interval. At 400-600 V (2.9-4.3 kV/cm), the split-dose treatments increased the ablation volume and cell death up to 2-3-fold compared to single-train treatments. Under the conditions tested, the maximum enhancement of ablation was achieved when two fractions were separated by 100 s. The results suggest that engaging electrosensitization may assist in vivo cancer ablation by reducing the voltage or number of pulses required, or by enabling larger inter-electrode distances without losing the ablation efficiency.
authors.affiliation: Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, VA 23508, USA.
authors.forename: Claudia
authors.initials: C
authors.lastname: Muratori
authors.affiliation: Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, VA 23508, USA.
authors.forename: Andrei G
authors.initials: AG
authors.lastname: Pakhomov
authors.affiliation: Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, VA 23508, USA.|Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, VA 23508, USA.
authors.forename: Shu
authors.initials: S
authors.lastname: Xiao
authors.affiliation: Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, VA 23508, USA.
authors.forename: Olga N
authors.initials: ON
authors.lastname: Pakhomova
mesh_terms: D055011:Ablation Techniques; D000818:Animals; D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D018929:Cell Culture Techniques / Q000379:methods*; D045744:Cell Line, Tumor; D002463:Cell Membrane Permeability; D002470:Cell Survival; D055590:Electromagnetic Phenomena; D018274:Electroporation / Q000379:methods*; D051379:Mice