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Chittams-Miles AE, Malik A, Purcell EB, Muratori C. Nanosecond pulsed electric fields increase antibiotic susceptibility in methicillin-resistant Staphylococcus aureus. Microbiol Spectr 2024; 12:e0299223. [PMID: 38092563 PMCID: PMC10783032 DOI: 10.1128/spectrum.02992-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Accepted: 10/31/2023] [Indexed: 01/13/2024] Open
Abstract
IMPORTANCE We have found that treatment with short electric pulses potentiates the effects of multiple antibiotics against methicillin-resistant Staphylococcus aureus. By reducing the dose of antibiotic necessary to be effective, co-treatment with electric pulses could amplify the effects of standard antibiotic dosing to treat S. aureus infections such as skin and soft-tissue infections (SSTIs). SSTIs are accessible to physical intervention and are good candidates for electric pulse co-treatment, which could be adopted as a step-in wound and abscess debridement.
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Affiliation(s)
- Alexandra E. Chittams-Miles
- Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, Virginia, USA
- Biomedical Sciences Program, Old Dominion University, Norfolk, Virginia, USA
| | - Areej Malik
- Biomedical Sciences Program, Old Dominion University, Norfolk, Virginia, USA
- Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, Virginia, USA
| | - Erin B. Purcell
- Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, Virginia, USA
| | - Claudia Muratori
- Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, Virginia, USA
- Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, Virginia, USA
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2
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Khairalla B, Juhaniewicz-Debinska J, Sek S, Brand I. The shape of lipid molecules affects potential-driven molecular-scale rearrangements in model cell membranes on electrodes. Bioelectrochemistry 2019; 132:107443. [PMID: 31869700 DOI: 10.1016/j.bioelechem.2019.107443] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 12/04/2019] [Accepted: 12/05/2019] [Indexed: 12/24/2022]
Abstract
Planar asymmetric lipid bilayers composed of phosphatidylethanolamine and phosphatidylglycerol lipids are transferred onto a gold electrode surface. Lipids containing two saturated, one monounsaturated and two monounsaturated hydrocarbon chains compose the model membranes. Results of electrochemically controlled polarization modulation infrared reflection absorption spectroscopy and quartz crystal microbalance with energy dissipation studies reveal two different types of electric potential-dependent structural rearrangements in the bilayers. They are correlated with the geometry of the lipid molecule. Packing parameter correlates the cross-section area of the hydrophobic and hydrophilic parts of amphiphilic molecules. In bilayers composed of lipids with the packing parameter <1, the hydrocarbon chains are tilted with respect to the bilayer plane and the polar head groups are well hydrated. At a threshold potential an abrupt flow of water through the bilayer is connected with membrane dehydration and upward orientation of the chains. In bilayers composed of lipids with packing parameter ≥1, electric potentials have negligible effect on the membrane structure. A simple rule correlating the packing parameter with molecular scale changes occurring at electrified membranes has a large diagnostic implication for biomimetic studies and our understanding of molecular processes occurring in biological cell membranes.
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Affiliation(s)
- Bishoy Khairalla
- Department of Chemistry, Carl von Ossietzky University of Oldenburg, 26111 Oldenburg, Germany
| | - Joanna Juhaniewicz-Debinska
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Zwirki i Wigury 101, 02089 Warsaw, Poland
| | - Slawomir Sek
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Zwirki i Wigury 101, 02089 Warsaw, Poland
| | - Izabella Brand
- Department of Chemistry, Carl von Ossietzky University of Oldenburg, 26111 Oldenburg, Germany.
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Cell Membrane Electropulsation: Chemical Analysis of Cell Membrane Modifications and Associated Transport Mechanisms. TRANSPORT ACROSS NATURAL AND MODIFIED BIOLOGICAL MEMBRANES AND ITS IMPLICATIONS IN PHYSIOLOGY AND THERAPY 2017; 227:59-71. [DOI: 10.1007/978-3-319-56895-9_4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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4
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Escoffre JM, Bellard E, Faurie C, Sébaï SC, Golzio M, Teissié J, Rols MP. Membrane disorder and phospholipid scrambling in electropermeabilized and viable cells. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:1701-9. [PMID: 24583083 DOI: 10.1016/j.bbamem.2014.02.013] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Revised: 02/11/2014] [Accepted: 02/19/2014] [Indexed: 11/25/2022]
Abstract
Membrane electropermeabilization relies on the transient permeabilization of the plasma membrane of cells submitted to electric pulses. This method is widely used in cell biology and medicine due to its efficiency to transfer molecules while limiting loss of cell viability. However, very little is known about the consequences of membrane electropermeabilization at the molecular and cellular levels. Progress in the knowledge of the involved mechanisms is a biophysical challenge. As a transient loss of membrane cohesion is associated with membrane permeabilization, our main objective was to detect and visualize at the single-cell level the incidence of phospholipid scrambling and changes in membrane order. We performed studies using fluorescence microscopy with C6-NBD-PC and FM1-43 to monitor phospholipid scrambling and membrane order of mammalian cells. Millisecond permeabilizing pulses induced membrane disorganization by increasing the translocation of phosphatidylcholines according to an ATP-independent process. The pulses induced the formation of long-lived permeant structures that were present during membrane resealing, but were not associated with phosphatidylcholine internalization. These pulses resulted in a rapid phospholipid flip/flop within less than 1s and were exclusively restricted to the regions of the permeabilized membrane. Under such electrical conditions, phosphatidylserine externalization was not detected. Moreover, this electrically-mediated membrane disorganization was not correlated with loss of cell viability. Our results could support the existence of direct interactions between the movement of membrane zwitterionic phospholipids and the electric field.
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Affiliation(s)
- Jean-Michel Escoffre
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), 205 route de Narbonne, F-31077, Toulouse, France; Université de Toulouse, UPS, IPBS, F-31077, Toulouse, France
| | - Elisabeth Bellard
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), 205 route de Narbonne, F-31077, Toulouse, France; Université de Toulouse, UPS, IPBS, F-31077, Toulouse, France
| | - Cécile Faurie
- Matwin-Institut Bergonié, 229 cours de l'Argonne, 33076 Bordeaux cedex, France
| | - Sarra C Sébaï
- Eviagenics, Immeuble Villejuif Biopark, 1 Mail du Professeur Georges Mathé, 94800 Villejuif, France
| | - Muriel Golzio
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), 205 route de Narbonne, F-31077, Toulouse, France; Université de Toulouse, UPS, IPBS, F-31077, Toulouse, France
| | - Justin Teissié
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), 205 route de Narbonne, F-31077, Toulouse, France; Université de Toulouse, UPS, IPBS, F-31077, Toulouse, France.
| | - Marie-Pierre Rols
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), 205 route de Narbonne, F-31077, Toulouse, France; Université de Toulouse, UPS, IPBS, F-31077, Toulouse, France.
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Bellavite P, Marzotto M, Olioso D, Moratti E, Conforti A. High-dilution effects revisited. 2. Pharmacodynamic mechanisms. HOMEOPATHY 2014; 103:22-43. [DOI: 10.1016/j.homp.2013.08.002] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Accepted: 08/12/2013] [Indexed: 11/30/2022]
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Ketabi N, Mobasheri H, Faraji-Dana R. Electromagnetic fields (UHF) increase voltage sensitivity of membrane ion channels; possible indication of cell phone effect on living cells. Electromagn Biol Med 2013; 34:1-13. [PMID: 24236537 DOI: 10.3109/15368378.2013.844706] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The effects of ultra high frequency (UHF) nonionizing electromagnetic fields (EMF) on the channel activities of nanopore forming protein, OmpF porin, were investigated. The voltage clamp technique was used to study the single channel activity of the pore in an artificial bilayer in the presence and absence of the electromagnetic fields at 910 to 990 MHz in real time. Channel activity patterns were used to address the effect of EMF on the dynamic, arrangement and dielectric properties of water molecules, as well as on the hydration state and arrangements of side chains lining the channel barrel. Based on the varied voltage sensitivity of the channel at different temperatures in the presence and absence of EMF, the amount of energy transferred to nano-environments of accessible groups was estimated to address the possible thermal effects of EMF. Our results show that the effects of EMF on channel activities are frequency dependent, with a maximum effect at 930 MHz. The frequency of channel gating and the voltage sensitivity is increased when the channel is exposed to EMF, while its conductance remains unchanged at all frequencies applied. We have not identified any changes in the capacitance and permeability of membrane in the presence of EMF. The effect of the EMF irradiated by cell phones is measured by Specific Absorption Rate (SAR) in artificial model of human head, Phantom. Thus, current approach applied to biological molecules and electrolytes might be considered as complement to evaluate safety of irradiating sources on biological matter at molecular level.
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Affiliation(s)
- N Ketabi
- Laboratory of Membrane Biophysics and Macromolecules, Institute of Biochemistry and Biophysics, University of Tehran , Tehran , Iran
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Escherichia coli Growth Changes by the Mediated Effects After Low-Intensity Electromagnetic Irradiation of Extremely High Frequencies. Cell Biochem Biophys 2012; 65:445-54. [DOI: 10.1007/s12013-012-9448-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Nesin OM, Pakhomova ON, Xiao S, Pakhomov AG. Manipulation of cell volume and membrane pore comparison following single cell permeabilization with 60- and 600-ns electric pulses. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2010; 1808:792-801. [PMID: 21182825 DOI: 10.1016/j.bbamem.2010.12.012] [Citation(s) in RCA: 119] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 11/08/2010] [Revised: 12/11/2010] [Accepted: 12/14/2010] [Indexed: 10/18/2022]
Abstract
Intense nanosecond-duration electric pulses (nsEP) open stable nanopores in the cell membrane, followed by cell volume changes due to water uptake or expulsion, as regulated by the osmolality balance of pore-impermeable solutes inside and outside the cell. The size of pores opened by either fifty 60-ns EP (~13 kV/cm) or five, 600-ns EP (~6 kV/cm) in GH3 cells was estimated by isoosmotic replacement of bath NaCl with polyethylene glycols and sugars. Such replacement reduced cell swelling or resulted in transient or sustained cell shrinking in response to EP. depending on the availability of pores permeable to the test solute. Unexpectedly, solute substitutions showed that for the same integral area of pores opened by 60- and 600-ns treatments (as estimated by cell volume changes), the pore sizes were similar. However, the 600-ns exposure triggered significantly higher cell uptake of propidium. We concluded that 600-ns EP opened a greater number of larger (propidium-permeable pores), but the fraction of the larger pores in the entire pore population was insufficient to contribute to cell volume changes. For both the 60- and 600-ns exposures, cell volume changes were determined by pores smaller than 0.9 nm in diameter; however, the diameter increased with increasing the nsEP intensity.
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Affiliation(s)
- Olena M Nesin
- Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, VA 23508, USA
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Cifra M, Fields JZ, Farhadi A. Electromagnetic cellular interactions. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2010; 105:223-46. [PMID: 20674588 DOI: 10.1016/j.pbiomolbio.2010.07.003] [Citation(s) in RCA: 136] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Accepted: 07/21/2010] [Indexed: 12/14/2022]
Abstract
Chemical and electrical interaction within and between cells is well established. Just the opposite is true about cellular interactions via other physical fields. The most probable candidate for an other form of cellular interaction is the electromagnetic field. We review theories and experiments on how cells can generate and detect electromagnetic fields generally, and if the cell-generated electromagnetic field can mediate cellular interactions. We do not limit here ourselves to specialized electro-excitable cells. Rather we describe physical processes that are of a more general nature and probably present in almost every type of living cell. The spectral range included is broad; from kHz to the visible part of the electromagnetic spectrum. We show that there is a rather large number of theories on how cells can generate and detect electromagnetic fields and discuss experimental evidence on electromagnetic cellular interactions in the modern scientific literature. Although small, it is continuously accumulating.
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Affiliation(s)
- Michal Cifra
- Institute of Photonics and Electronics, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
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Abe F, Usui K, Hiraki T. Fluconazole modulates membrane rigidity, heterogeneity, and water penetration into the plasma membrane in Saccharomyces cerevisiae. Biochemistry 2009; 48:8494-504. [PMID: 19670905 DOI: 10.1021/bi900578y] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Azole anitifungal drugs such as fluconazole inhibit 14alpha-demethylase. The mechanism of fluconazole action on the plasma membrane is assumed to be ergosterol depletion and accumulation of a toxic sterol, 14alpha-methyl-3,6-diol, that differs in C-6 hydroxylation, B-ring saturation, C-14 methylation, and side-chain modification. Nevertheless, little is known about how these sterol modifications mechanically influence membrane properties and hence fungal viability. Employing time-resolved measurement with a fluorescence anisotropy probe, 1-[4-(trimethylamino)phenyl]-6-phenyl-1,3,5-hexatriene (TMA-DPH), we demonstrated that fluconazole administration decreased the rigidity of the plasma membrane of Saccharomyces cerevisiae, leading to a dramatic reduction in the order parameter (S) from 0.965 to 0.907 and a 5-fold acceleration of the rotational lipid motion. This suggests that the altered sterol has a deleterious impact on membrane packing, resulting in increased fluidity. Deletion of ERG3 confers hyperresistance to fluconazole by circumventing the accumulation of 14alpha-methyl-3,6-diol and instead produces 14alpha-methylfecosterol lacking the 6-OH group. We found that ERG3 deletion mitigated the fluconazole-induced loss of membrane rigidity with S remaining at a higher value (=0.922), which could contribute to the fluconazole resistance in the erg3Delta mutant. The reduced ability of the 6-OH sterol to stiffen lipid bilayers was supported by the finding that 30 mol % of 6alpha-hydroxy-5alpha-cholestanol marginally increased the S value of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine membranes, while cholesterol and dihydrocholesterol markedly increased it. The decay of the TMA-DPH fluorescence was bimodal in the wild-type strain. This heterogeneity could have arisen from varying degrees of water penetration into the plasma membrane. Fluconazole eliminated the heterogeneity of the dielectric characteristic of the membrane interfacial region, and concomitantly the TMA-DPH lifetime was shortened. Therefore, we conclude that 14alpha-methyl-3,6-diol is insufficient to pack the plasma membrane, allowing water penetration, which is consistent with membrane disorder after fluconazole administration. Our findings illustrate the role of ergosterol in maintaining membrane heterogeneity and preventing water penetration as well as maintaining the rigidity of the plasma membrane interfacial region.
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Affiliation(s)
- Fumiyoshi Abe
- Molecular Evolution and Adaptation Research, Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka 237-0061, Japan.
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Ziegler MJ, Vernier PT. Interface Water Dynamics and Porating Electric Fields for Phospholipid Bilayers. J Phys Chem B 2008; 112:13588-96. [DOI: 10.1021/jp8027726] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Matthew J. Ziegler
- Mork Family Department of Chemical Engineering and Materials Science, Viterbi School of Engineering, University of Southern California, Los Angeles, California 90089-0271, MOSIS, Information Sciences Institute, Viterbi School of Engineering, University of Southern California, Marina del Rey, California 90292-6695, and Ming Hsieh Department of Electrical Engineering-Electrophysics, Viterbi School of Engineering, University of Southern California, Los Angeles, California 90089-0271
| | - P. Thomas Vernier
- Mork Family Department of Chemical Engineering and Materials Science, Viterbi School of Engineering, University of Southern California, Los Angeles, California 90089-0271, MOSIS, Information Sciences Institute, Viterbi School of Engineering, University of Southern California, Marina del Rey, California 90292-6695, and Ming Hsieh Department of Electrical Engineering-Electrophysics, Viterbi School of Engineering, University of Southern California, Los Angeles, California 90089-0271
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