Electric Destabilization of Supramolecular Lipid Vesicles Subjected to Fast Electric Pulses.
Biological membranes are weakly permeable to hydrophilic molecules and ions and electric pulses can induce their transient permeabilization, but this process is not well characterized. We directly assay the electropermeabilization process, on the minimum model of lipid vesicles, by using a highly sensitive fluorescence method based on manganese ion transport. The approach gives access, at the single-lipid self-assembly level, to the transmembrane potential needed to detect divalent ion permeabilization on supramolecular giant unilamellar lipid vesicles. The critical values are strongly dependent on the lipid composition and are observed to vary from 10 to 150 mV. These values appear to be much lower than those previously reported in the literature for cells and vesicles. The detection method appears to be a decisive parameter as it is controlled by the transport of the reporter dye. We also provide evidence that the electropermeabilization process is a transient transition of the lipid self-organization due to the loss of assembly cohesion induced by bioelectrochemical perturbations of the zwitterionic interface with the solution.
Institut de Pharmacologie et de Biologie Structurale, Centre National de la Recherche Scientifique, UMR 5089 and Université Paul Sabatier , 205 route de Narbonne, BP 64182, 31077 Toulouse, France.|Laboratoire des Interactions Moléculaires et Réactivité Chimique et Photochimique, UMR 5623 CNRS and Université Paul Sabatier , 118 route de Narbonne, 31062 Toulouse, France.
Chloé
C
Mauroy
Laboratoire des Interactions Moléculaires et Réactivité Chimique et Photochimique, UMR 5623 CNRS and Université Paul Sabatier , 118 route de Narbonne, 31062 Toulouse, France.
Isabelle
I
Rico-Lattes
Institut de Pharmacologie et de Biologie Structurale, Centre National de la Recherche Scientifique, UMR 5089 and Université Paul Sabatier , 205 route de Narbonne, BP 64182, 31077 Toulouse, France.|Emeritus Institut de Pharmacologie et de Biologie Structurale, Centre National de la Recherche Scientifique, UMR 5089 and Université Paul Sabatier, 205 route de Narbonne, BP 64182, 31077 Toulouse, France.
Justin
J
Teissié
Institut de Pharmacologie et de Biologie Structurale, Centre National de la Recherche Scientifique, UMR 5089 and Université Paul Sabatier , 205 route de Narbonne, BP 64182, 31077 Toulouse, France.
Marie-Pierre
MP
Rols
D002462:Cell Membrane / Q000378:metabolism; D017136:Ion Transport; D008345:Manganese / Q000378:metabolism; D008563:Membrane Lipids / Q000737:chemistry*
D008563:Membrane Lipids; D008345:Manganese