Monitoring the molecular composition of live cells exposed to electric pulses via label-free optical methods.
Fiche publication
Date publication
juin 2020
Journal
Scientific reports
Auteurs
Membres identifiés du Cancéropôle Est :
Pr PIOT Olivier
Tous les auteurs :
Azan A, Grognot M, García-Sánchez T, Descamps L, Untereiner V, Piot O, Gallot G, Mir LM
Lien Pubmed
Résumé
The permeabilization of the live cells membrane by the delivery of electric pulses has fundamental interest in medicine, in particular in tumors treatment by electrochemotherapy. Since underlying mechanisms are still not fully understood, we studied the impact of electric pulses on the biochemical composition of live cells thanks to label-free optical methods: confocal Raman microspectroscopy and terahertz microscopy. A dose effect was observed after cells exposure to different field intensities and a major impact on cell peptide/protein content was found. Raman measurements reveal that protein structure and/or environment are modified by the electric pulses while terahertz measurements suggest a leakage of proteins and other intracellular compounds. We show that Raman and terahertz modalities are a particularly attractive complement to fluorescence microscopy which is the reference optical technique in the case of electropermeabilization. Finally, we propose an analytical model for the influx and efflux of non-permeant molecules through transiently (electro)permeabilized cell membranes.
Référence
Sci Rep. 2020 Jun 26;10(1):10471