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Open AccessArticle

Cell Electropermeabilisation Enhancement by Non-Thermal-Plasma-Treated PBS

1
Université Paris-Saclay, CNRS, Institut Gustave Roussy, Metabolic and Systemic Aspects of Oncogenesis (METSY), 94805 Villejuif, France
2
GREMI, UMR 7344 CNRS/Université d’Orléans, 45067 Orléans, France
3
Université Paris-Saclay, CNRS, Laboratoire de Physique des Gaz et des Plasmas, 91405 Orsay, France
*
Author to whom correspondence should be addressed.
Cancers 2020, 12(1), 219; https://doi.org/10.3390/cancers12010219
Received: 20 December 2019 / Revised: 13 January 2020 / Accepted: 13 January 2020 / Published: 16 January 2020
The effectiveness of electrochemotherapy (ECT) in local eradication of tumours in human and veterinary medicine has been proven. ECT consists of increasing the uptake of cytotoxic drugs by means of pulsed electric fields (PEFs) that transiently permeabilise the cell membrane. Still, this tumour treatment includes some drawbacks that are linked to the characteristics of the intense electric pulses (EPs) used. Meanwhile, the emerging field of cancer therapies that are based on the application of non-thermal plasmas (NTP) has recently garnered interest because of their potentialities as rich sources of reactive species. In this work, we investigated the potential capabilities of the combined application of indirect NTP treatment and microsecond PEFs (µsPEFs) to outperform in vitro cell electropermeabilisation, the basis of ECT. Thus, phosphate-buffered saline (PBS) was plasma-treated (pPBS) and used afterwards to explore the effects of its combination with µsPEFs. Analysis of two different cell lines (DC-3F Chinese hamster lung fibroblasts and malignant B16-F10 murine melanoma cells), by flow cytometry, revealed that this combination resulted in significant increases of the level of cell membrane electropermeabilisation, even at very low electric field amplitude. The B16-F10 cells were more sensitive to the combined treatment than DC-3F cells. Importantly, the percentage of permeabilised cells reached values similar to those of cells exposed to classical electroporation field amplitude (1100 V/cm) when the cells were treated with pPBS before and after being exposed only to very low PEF amplitude (600 V/cm). Although the level of permeabilisation of the cells that are treated by the pPBS and the PEFs at 600 V/cm is lower than the level reached after the exposure to µsPEFs alone at 1100 V/cm, the combined treatment opens the possibility to reduce the amplitude of the EPs used in ECT, potentially allowing for a novel ECT with reduced side-effects. View Full-Text
Keywords: cancer; non-thermal atmospheric pressure plasma (NTP); plasma medicine; indirect treatment; plasma-treated phosphate-buffered saline; electroporation; electric pulses; pulsed electric field amplitude; melanoma; long-lived reactive species cancer; non-thermal atmospheric pressure plasma (NTP); plasma medicine; indirect treatment; plasma-treated phosphate-buffered saline; electroporation; electric pulses; pulsed electric field amplitude; melanoma; long-lived reactive species
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Chung, T.-H.; Stancampiano, A.; Sklias, K.; Gazeli, K.; André, F.M.; Dozias, S.; Douat, C.; Pouvesle, J.-M.; Santos Sousa, J.; Robert, É.; Mir, L.M. Cell Electropermeabilisation Enhancement by Non-Thermal-Plasma-Treated PBS. Cancers 2020, 12, 219.

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