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Tao XN, Liu HT, Xiang XW, Zhu CH, Qiu J, Zhao H, Liu KF. Regulating the Distribution and Accumulation of Charged Molecules by Progressive Electroporation for Improved Intracellular Delivery. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38958208 DOI: 10.1021/acsami.4c05340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
The cell membrane separates the intracellular compartment from the extracellular environment, constraining exogenous molecules to enter the cell. Conventional electroporation typically employs high-voltage and short-duration pulses to facilitate the transmembrane transport of molecules impermeable to the membrane under natural conditions by creating temporary hydrophilic pores on the membrane. Electroporation not only enables the entry of exogenous molecules but also directs the intracellular distribution of the electric field. Recent advancements have markedly enhanced the efficiency of intracellular molecule delivery, achieved through the utilization of microstructures, microelectrodes, and surface modifications. However, little attention is paid to regulating the motion of molecules during and after passing through the membrane to improve delivery efficiency, resulting in an unsatisfactory delivery efficiency and high dose demand. Here, we proposed the strategy of regulating the motion of charged molecules during the delivery process by progressive electroporation (PEP), utilizing modulated electric fields. Efficient delivery of charged molecules with an expanded distribution and increased accumulation by PEP was demonstrated through numerical simulations and experimental results. The dose demand can be reduced by 10-40% depending on the size and charge of the molecules. We confirmed the safety of PEP for intracellular delivery in both short and long terms through cytotoxicity assays and transcriptome analysis. Overall, this work not only reveals the mechanism and effectiveness of PEP-enhanced intracellular delivery of charged molecules but also suggests the potential integration of field manipulation of molecular motion with surface modification techniques for biomedical applications such as cell engineering and sensitive cellular monitoring.
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Affiliation(s)
- Xiao-Nan Tao
- School of Information Science and Technology, Fudan University, Shanghai 200433, China
| | - Hao-Tian Liu
- Academy for Engineering & Technology, Fudan University, Shanghai 200433, China
| | - Xiao-Wei Xiang
- Westlake Laboratory of Life Sciences and Biomedicine, School of Life Sciences, Westlake University, Hangzhou, Zhejiang 310030, China
| | - Cai-Hui Zhu
- School of Information Science and Technology, Fudan University, Shanghai 200433, China
| | - Jian Qiu
- School of Information Science and Technology, Fudan University, Shanghai 200433, China
| | - Hui Zhao
- School of Information Science and Technology, Fudan University, Shanghai 200433, China
| | - Ke-Fu Liu
- School of Information Science and Technology, Fudan University, Shanghai 200433, China
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Berry-Kilgour C, Wise L, King J, Oey I. Application of pulsed electric field technology to skin engineering. Front Bioeng Biotechnol 2024; 12:1386725. [PMID: 38689761 PMCID: PMC11058833 DOI: 10.3389/fbioe.2024.1386725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Accepted: 04/01/2024] [Indexed: 05/02/2024] Open
Abstract
Tissue engineering encompasses a range of techniques that direct the growth of cells into a living tissue construct for regenerative medicine applications, disease models, drug discovery, and safety testing. These techniques have been implemented to alleviate the clinical burdens of impaired healing of skin, bone, and other tissues. Construct development requires the integration of tissue-specific cells and/or an extracellular matrix-mimicking biomaterial for structural support. Production of such constructs is generally expensive and environmentally costly, thus eco-sustainable approaches should be explored. Pulsed electric field (PEF) technology is a nonthermal physical processing method commonly used in food production and biomedical applications. In this review, the key principles of PEF and the application of PEF technology for skin engineering will be discussed, with an emphasis on how PEF can be applied to skin cells to modify their behaviour, and to biomaterials to assist in their isolation or sterilisation, or to modify their physical properties. The findings indicate that the success of PEF in tissue engineering will be reliant on systematic evaluation of key parameters, such as electric field strength, and their impact on different skin cell and biomaterial types. Linking tangible input parameters to biological responses critical to healing will assist with the development of PEF as a sustainable tool for skin repair and other tissue engineering applications.
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Affiliation(s)
- C. Berry-Kilgour
- Department of Pharmacology and Toxicology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - L. Wise
- Department of Pharmacology and Toxicology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - J. King
- Department of Food Sciences, University of Otago, Dunedin, New Zealand
- Riddet Institute, Palmerston North, New Zealand
| | - I. Oey
- Department of Food Sciences, University of Otago, Dunedin, New Zealand
- Riddet Institute, Palmerston North, New Zealand
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3
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Rajagopalan NR, Munawar T, Sheehan MC, Fujimori M, Vista WR, Wimmer T, Gutta NB, Solomon SB, Srimathveeravalli G. Electrolysis products, reactive oxygen species and ATP loss contribute to cell death following irreversible electroporation with microsecond-long pulsed electric fields. Bioelectrochemistry 2024; 155:108579. [PMID: 37769509 PMCID: PMC10841515 DOI: 10.1016/j.bioelechem.2023.108579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 09/13/2023] [Accepted: 09/21/2023] [Indexed: 10/03/2023]
Abstract
Membrane permeabilization and thermal injury are the major cause of cell death during irreversible electroporation (IRE) performed using high electric field strength (EFS) and small number of pulses. In this study, we explored cell death under conditions of reduced EFS and prolonged pulse application, identifying the contributions of electrolysis, reactive oxygen species (ROS) and ATP loss. We performed ablations with conventional high-voltage low pulse (HV-LP) and low-voltage high pulse (LV-HP) conditions in a 3D tumor mimic, finding equivalent ablation volumes when using 2000 V/cm 90 pulses or 1000 V/cm 900 pulses respectively. These results were confirmed by performing ablations in swine liver. In LV-HP treatment, ablation volume was found to increase proportionally with pulse numbers, without the substantial temperature increase seen with HV-LP parameters. Peri-electrode pH changes, ATP loss and ROS production were seen in both conditions, but LV-HP treatments were more sensitive to blocking of these forms of cell injury. Increases in current drawn during HV-LP was not observed during LV-HP condition where the total ablation volume correlated to the charge delivered into the tissue which was greater than HV-LP treatment. LV-HP treatment provides a new paradigm in using pulsed electric fields for tissue ablation with clinically relevant volumes.
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Affiliation(s)
| | - Tarek Munawar
- Department of Radiology, Interventional Radiology Service, Memorial Sloan-Kettering Cancer Center, NY, USA
| | - Mary Chase Sheehan
- Department of Mechanical and Industrial Engineering, University of Massachusetts Amherst, Amherst, MA, USA
| | | | - William-Ray Vista
- Department of Radiology, Interventional Radiology Service, Memorial Sloan-Kettering Cancer Center, NY, USA
| | - Thomas Wimmer
- Dept. of Radiology, Division of General Radiology, Medical University of Graz, Austria
| | | | - Stephen B Solomon
- Department of Radiology, Interventional Radiology Service, Memorial Sloan-Kettering Cancer Center, NY, USA
| | - Govindarajan Srimathveeravalli
- Department of Mechanical and Industrial Engineering, University of Massachusetts Amherst, Amherst, MA, USA; Institute for Applied Life Sciences, University of Massachusetts Amherst, Amherst, MA, USA.
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4
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Wang F, Lin S, Yu Z, Wang Y, Zhang D, Cao C, Wang Z, Cui D, Chen D. Recent advances in microfluidic-based electroporation techniques for cell membranes. LAB ON A CHIP 2022; 22:2624-2646. [PMID: 35775630 DOI: 10.1039/d2lc00122e] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Electroporation is a fundamental technique for applications in biotechnology. To date, the ongoing research on cell membrane electroporation has explored its mechanism, principles and potential applications. Therefore, in this review, we first discuss the primary electroporation mechanism to help establish a clear framework. Within the context of its principles, several critical terms are highlighted to present a better understanding of the theory of aqueous pores. Different degrees of electroporation can be used in different applications. Thus, we discuss the electric factors (shock strength, shock duration, and shock frequency) responsible for the degree of electroporation. In addition, finding an effective electroporation detection method is of great significance to optimize electroporation experiments. Accordingly, we summarize several primary electroporation detection methods in the following sections. Finally, given the development of micro- and nano-technology has greatly promoted the innovation of microfluidic-based electroporation devices, we also present the recent advances in microfluidic-based electroporation devices. Also, the challenges and outlook of the electroporation technique for cell membrane electroporation are presented.
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Affiliation(s)
- Fei Wang
- School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
- Shanghai Engineering Research Centre for Intelligent Diagnosis and Treatment Instrument, Shanghai 200240, P. R. China
- Key Lab. for Thin Film and Microfabrication Technology of Ministry of Education, Shanghai 200240, P. R. China
| | - Shujing Lin
- School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
- Shanghai Engineering Research Centre for Intelligent Diagnosis and Treatment Instrument, Shanghai 200240, P. R. China
- Key Lab. for Thin Film and Microfabrication Technology of Ministry of Education, Shanghai 200240, P. R. China
| | - Zixian Yu
- School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
- Shanghai Engineering Research Centre for Intelligent Diagnosis and Treatment Instrument, Shanghai 200240, P. R. China
- Key Lab. for Thin Film and Microfabrication Technology of Ministry of Education, Shanghai 200240, P. R. China
| | - Yanpu Wang
- School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
- Shanghai Engineering Research Centre for Intelligent Diagnosis and Treatment Instrument, Shanghai 200240, P. R. China
- Key Lab. for Thin Film and Microfabrication Technology of Ministry of Education, Shanghai 200240, P. R. China
| | - Di Zhang
- Centre for Advanced Electronic Materials and Devices (AEMD), Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Chengxi Cao
- School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
- Shanghai Engineering Research Centre for Intelligent Diagnosis and Treatment Instrument, Shanghai 200240, P. R. China
| | - Zhigang Wang
- Department of General Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai 200233, China
| | - Daxiang Cui
- School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
- Shanghai Engineering Research Centre for Intelligent Diagnosis and Treatment Instrument, Shanghai 200240, P. R. China
- Key Lab. for Thin Film and Microfabrication Technology of Ministry of Education, Shanghai 200240, P. R. China
| | - Di Chen
- School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
- Shanghai Engineering Research Centre for Intelligent Diagnosis and Treatment Instrument, Shanghai 200240, P. R. China
- Key Lab. for Thin Film and Microfabrication Technology of Ministry of Education, Shanghai 200240, P. R. China
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5
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Asadpour F, Zhang XW, Mazloum-Ardakani M, Mirzaei M, Majdi S, Ewing AG. Vesicular release dynamics are altered by the interaction between the chemical cargo and vesicle membrane lipids. Chem Sci 2021; 12:10273-10278. [PMID: 34447531 PMCID: PMC8336585 DOI: 10.1039/d1sc02247d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Accepted: 06/25/2021] [Indexed: 01/07/2023] Open
Abstract
The release of the cargo from soft vesicles, an essential process for chemical delivery, is mediated by multiple factors. Among them, the regulation by the interaction between the chemical cargo species and the vesicular membrane, widely existing in all vesicles, has not been investigated to date. Yet, these interactions hold the potential to complicate the release process. We used liposomes loaded with different monoamines, dopamine (DA) and serotonin (5-HT), to simulate vesicular release and to monitor the dynamics of chemical release from isolated vesicles during vesicle impact electrochemical cytometry (VIEC). The release of DA from liposomes presents a longer release time compared to 5-HT. Modelling the release time showed that DA filled vesicles had a higher percentage of events where the time for the peak fall was better fit to a double exponential (DblExp) decay function, suggesting multiple kinetic steps in the release. By fitting to a desorption-release model, where the transmitters adsorbed to the vesicle membrane, the dissociation rates of DA and 5-HT from the liposome membrane were estimated. DA has a lower desorption rate constant, which leads to slower DA release than that observed for 5-HT, whereas there is little difference in pore size. The alteration of vesicular release dynamics due to the interaction between the chemical cargo and vesicle membrane lipids provides an important mechanism to regulate vesicular release in chemical and physiological processes. It is highly possible that this introduces a fundamental chemical regulation difference between transmitters during exocytosis.
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Affiliation(s)
- Farzaneh Asadpour
- Department of Chemistry and Molecular Biology, University of Gothenburg 41296 Gothenburg Sweden .,Department of Chemistry, Faculty of Science, Yazd University Yazd 89195-741 Iran
| | - Xin-Wei Zhang
- Department of Chemistry and Molecular Biology, University of Gothenburg 41296 Gothenburg Sweden
| | | | - Meysam Mirzaei
- Department of Materials Science and Engineering, School of Engineering, Shiraz University Shiraz Iran
| | - Soodabeh Majdi
- Department of Chemistry and Molecular Biology, University of Gothenburg 41296 Gothenburg Sweden
| | - Andrew G Ewing
- Department of Chemistry and Molecular Biology, University of Gothenburg 41296 Gothenburg Sweden
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6
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Nanosecond pulses targeting intracellular ablation increase destruction of tumor cells with irregular morphology. Bioelectrochemistry 2019; 132:107432. [PMID: 31918056 DOI: 10.1016/j.bioelechem.2019.107432] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 11/22/2019] [Accepted: 11/22/2019] [Indexed: 01/04/2023]
Abstract
The decrease in killing sensitivity of the cell membrane to microsecond pulse electric fields (μs-PEFs) is ascribed mainly to the aberrant morphology of cancer cells, with clear statistical correlations observed between cell size and shape defects and the worsening of the electrical response to the PEF. In this paper, nanosecond pulsed electric fields (ns-PEFs) inducing the nucleus effect and μs-PEFs targeting the cell membrane were combined to enhance destruction of irregular cells. The fluorescence dissipation levels of the nuclear membrane and cell membrane exposed to the μs, ns, and ns + μs pulse protocols were measured and compared, and a dynamic electroporation model of irregular cells was established by the finite element software COMSOL. The results suggest that the cell membrane disruption induced by μs-PEFs is worse for extremely irregular cells and depends strongly on cellular morphology. However, the nuclear membrane disruption induced by ns-PEFs does not scale with irregularity, suggesting the use of a combination of ns-PEFs with μs-PEFs to target the nuclear and cell membranes. We demonstrate that ns + μs pulses can significantly enhance the fluorescence dissipation of the cell and nuclear membranes. Overall, our findings indicate that ns + μs pulses may be useful in the effective killing of irregular cells.
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7
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Murovec T, Sweeney DC, Latouche E, Davalos RV, Brosseau C. Modeling of Transmembrane Potential in Realistic Multicellular Structures before Electroporation. Biophys J 2017; 111:2286-2295. [PMID: 27851950 DOI: 10.1016/j.bpj.2016.10.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 09/13/2016] [Accepted: 10/05/2016] [Indexed: 12/18/2022] Open
Abstract
Many approaches for studying the transmembrane potential (TMP) induced during the treatment of biological cells with pulsed electric fields have been reported. From the simple analytical models to more complex numerical models requiring significant computational resources, a gamut of methods have been used to recapitulate multicellular environments in silico. Cells have been modeled as simple shapes in two dimensions as well as more complex geometries attempting to replicate realistic cell shapes. In this study, we describe a method for extracting realistic cell morphologies from fluorescence microscopy images to generate the piecewise continuous mesh used to develop a finite element model in two dimensions. The preelectroporation TMP induced in tightly packed cells is analyzed for two sets of pulse parameters inspired by clinical irreversible electroporation treatments. We show that high-frequency bipolar pulse trains are better, and more homogeneously raise the TMP of tightly packed cells to a simulated electroporation threshold than conventional irreversible electroporation pulse trains, at the expense of larger applied potentials. Our results demonstrate the viability of our method and emphasize the importance of considering multicellular effects in the numerical models used for studying the response of biological tissues exposed to electric fields.
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Affiliation(s)
- Tomo Murovec
- Lab-STICC, Université de Brest, CS 93837, Brest, France.
| | - Daniel C Sweeney
- Bioelectromechanical Systems Laboratory, Department of Biomedical Engineering and Mechanics, Virginia Tech-Wake Forest University, Blacksburg, Virginia
| | - Eduardo Latouche
- Bioelectromechanical Systems Laboratory, Department of Biomedical Engineering and Mechanics, Virginia Tech-Wake Forest University, Blacksburg, Virginia
| | - Rafael V Davalos
- Bioelectromechanical Systems Laboratory, Department of Biomedical Engineering and Mechanics, Virginia Tech-Wake Forest University, Blacksburg, Virginia
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8
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Clodoveo ML, Dipalmo T, Rizzello CG, Corbo F, Crupi P. Emerging technology to develop novel red winemaking practices: An overview. INNOV FOOD SCI EMERG 2016. [DOI: 10.1016/j.ifset.2016.08.020] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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9
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Sözer EB, Wu YH, Romeo S, Vernier PT. Nanometer-Scale Permeabilization and Osmotic Swelling Induced by 5-ns Pulsed Electric Fields. J Membr Biol 2016; 250:21-30. [PMID: 27435216 DOI: 10.1007/s00232-016-9918-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Accepted: 07/11/2016] [Indexed: 11/25/2022]
Abstract
High-intensity nanosecond pulsed electric fields (nsPEFs) permeabilize cell membranes. Although progress has been made toward an understanding of the mechanism of nsPEF-induced membrane poration, the dependence of pore size and distribution on pulse duration, strength, number, and repetition rate remains poorly defined experimentally. In this paper, we characterize the size of nsPEF-induced pores in living cell membranes by isosmotically replacing the solutes in pulsing media with polyethylene glycols and sugars before exposing Jurkat T lymphoblasts to 5 ns, 10 MV/m electric pulses. Pore size was evaluated by analyzing cell volume changes resulting from the permeation of osmolytes through the plasma membrane. We find that pores created by 5 ns pulses have a diameter between 0.7 and 0.9 nm at pulse counts up to 100 with a repetition rate of 1 kHz. For larger number of pulses, either the pore diameter or the number of pores created, or both, increase with increasing pulse counts. But the prevention of cell swelling by PEG 1000 even after 2000 pulses suggests that 5 ns, 10 MV/m pulses cannot produce pores with a diameter larger than 1.9 nm.
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Affiliation(s)
- Esin B Sözer
- Frank Reidy Research Center for Bioelectrics, Old Dominion University, 4211 Monarch Way. STE 300, Norfolk, VA, USA.
| | - Yu-Hsuan Wu
- Mork Family Department of Chemical Engineering and Materials Science, Viterbi School of Engineering, University of Southern California, Los Angeles, CA, USA
| | - Stefania Romeo
- CNR - Institute for Electromagnetic Sensing of the Environment (IREA), Via Diocleziano 328, 80124, Naples, Italy
| | - P Thomas Vernier
- Frank Reidy Research Center for Bioelectrics, Old Dominion University, 4211 Monarch Way. STE 300, Norfolk, VA, USA
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10
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Lamberti P, Romeo S, Sannino A, Zeni L, Zeni O. The Role of Pulse Repetition Rate in nsPEF-Induced Electroporation: A Biological and Numerical Investigation. IEEE Trans Biomed Eng 2015; 62:2234-43. [DOI: 10.1109/tbme.2015.2419813] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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11
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Wegner LH. The conductance of cellular membranes at supra-physiological voltages. Bioelectrochemistry 2015; 103:34-8. [PMID: 25246349 DOI: 10.1016/j.bioelechem.2014.08.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Revised: 07/29/2014] [Accepted: 08/12/2014] [Indexed: 11/16/2022]
Abstract
Membrane permeabilization by pulsed electric fields (electroporation), that is supposed to be caused by the formation of aqueous pores, is widely used in biomedicine and biotechnology. It is detected most precisely by measuring membrane conductance. When whole-cell patch-clamp experiments are used to screen a wide voltage range, poration becomes manifest by large currents elicited at extreme hyper-/depolarization. The slope conductance, G(slope), can be obtained from non-linear current-voltage relations by differentiation of the current-voltage curve. Alternatively, the chord conductance, G(chord), is defined as the slope of straight lines connecting each point on the current-voltage curve with the zero-current (reversal) potential on the voltage axis. Here, Boltzmann functions were fitted to plots of G(chord) versus voltage recorded on protoplasts from bright-yellow-2 tobacco cells. These plots are supposed to reflect transition from a non-porated to a porated membrane state. Consistently, G(chord) saturated at extremely negative and positive voltages at values well below those expected for a complete demolition of the membrane (half-maximum voltages: ~-332 mV and +294 mV, respectively). The slope factor allowed inferring the change in dipole moment associated with water intrusion into the bilayer. It was -6.19 10(-4) and 3.35 10(-4)C ∗ m ∗ mol(-1), respectively. Outside-out patches rendered similar results, but half-maximum voltages were shifted to more extreme voltages with respect to whole-cell experiments.
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Affiliation(s)
- Lars H Wegner
- Karlsruhe Institute of Technology (KIT), Institute of Pulsed Power and Microwave Technology, Institute of Botany 1, Post office box 3640, D-76021 Karlsruhe, Germany.
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12
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Faridnia F, Bekhit AEDA, Niven B, Oey I. Impact of pulsed electric fields and post-mortem vacuum ageing on beeflongissimus thoracismuscles. Int J Food Sci Technol 2014. [DOI: 10.1111/ijfs.12532] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Farnaz Faridnia
- Department of Food Science; University of Otago; PO Box 56 Dunedin 9054 New Zealand
| | | | - Brian Niven
- Centre for Application of Statistics & Mathematics; University of Otago; PO BOX 56 Dunedin 9054 New Zealand
| | - Indrawati Oey
- Department of Food Science; University of Otago; PO Box 56 Dunedin 9054 New Zealand
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13
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Roohinejad S, Everett DW, Oey I. Effect of pulsed electric field processing on carotenoid extractability of carrot purée. Int J Food Sci Technol 2014. [DOI: 10.1111/ijfs.12510] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Shahin Roohinejad
- Department of Food Science; University of Otago; PO Box 56 Dunedin 9054 New Zealand
| | - David W. Everett
- Department of Food Science; University of Otago; PO Box 56 Dunedin 9054 New Zealand
- Riddet Institute; Private Bag 11 222 Palmerston North 4442 New Zealand
| | - Indrawati Oey
- Department of Food Science; University of Otago; PO Box 56 Dunedin 9054 New Zealand
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14
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An R, Wipf DO, Minerick AR. Spatially variant red blood cell crenation in alternating current non-uniform fields. BIOMICROFLUIDICS 2014; 8:021803. [PMID: 24753734 PMCID: PMC3977840 DOI: 10.1063/1.4867557] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Accepted: 02/24/2014] [Indexed: 05/04/2023]
Abstract
Alternating-current (AC) electrokinetics involve the movement and behaviors of particles or cells. Many applications, including dielectrophoretic manipulations, are dependent upon charge interactions between the cell or particle and the surrounding medium. Medium concentrations are traditionally treated as spatially uniform in both theoretical models and experiments. Human red blood cells (RBCs) are observed to crenate, or shrink due to changing osmotic pressure, over 10 min experiments in non-uniform AC electric fields. Cell crenation magnitude is examined as functions of frequency from 250 kHz to 1 MHz and potential from 10 Vpp to 17.5 Vpp over a 100 μm perpendicular electrode gap. Experimental results show higher peak to peak potential and lower frequency lead to greater cell volume crenation up to a maximum volume loss of 20%. A series of experiments are conducted to elucidate the physical mechanisms behind the red blood cell crenation. Non-uniform and uniform electrode systems as well as high and low ion concentration experiments are compared and illustrate that AC electroporation, system temperature, rapid temperature changes, medium pH, electrode reactions, and convection do not account for the crenation behaviors observed. AC electroosmotic was found to be negligible at these conditions and AC electrothermal fluid flows were found to reduce RBC crenation behaviors. These cell deformations were attributed to medium hypertonicity induced by ion concentration gradients in the spatially nonuniform AC electric fields.
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Affiliation(s)
- Ran An
- Department of Chemical Engineering, Michigan Technological University, Houghton, Michigan 49931, USA
| | - David O Wipf
- Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - Adrienne R Minerick
- Department of Chemical Engineering, Michigan Technological University, Houghton, Michigan 49931, USA
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15
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Influence of Pulsed Electric Field Protocols on the Reversible Permeabilization of Rucola Leaves. FOOD BIOPROCESS TECH 2013. [DOI: 10.1007/s11947-013-1067-y] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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16
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Li J, Tan W, Yu M, Lin H. The effect of extracellular conductivity on electroporation-mediated molecular delivery. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:461-70. [DOI: 10.1016/j.bbamem.2012.08.014] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Revised: 08/03/2012] [Accepted: 08/20/2012] [Indexed: 10/27/2022]
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17
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Movahed S, Li D. A Theoretical Study of Single-Cell Electroporation in a Microchannel. J Membr Biol 2012; 246:151-60. [DOI: 10.1007/s00232-012-9515-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Accepted: 10/15/2012] [Indexed: 10/27/2022]
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18
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Homhuan S, Zhang B, Sheu FS, Bettiol AA, Watt F. Single-cell electroporation using proton beam fabricated biochips. Biomed Microdevices 2012; 14:533-40. [PMID: 22327811 DOI: 10.1007/s10544-012-9630-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
We report the design and fabrication of a novel single cell electroporation biochip featuring high aspect ratio nickel micro-electrodes with smooth side walls between which individual cells are attached. The biochip is fabricated using Proton Beam Writing (PBW), a new direct write lithographic technique capable of fabricating high quality high-aspect-ratio nano and microstructures. By applying electrical impulses across the biochip electrodes, SYTOX® Green nucleic acid stain is incorporated into mouse neuroblastoma (N2a) cells and observed via green fluorescence when the stain binds with DNA inside the cell nucleus. Three parameters; electric field strength, pulse duration, and numbers of pulses have been investigated for the single cell electroporation process. The results indicate high transfection rates as well as cell viability of 82.1 and 86.7% respectively. This single cell electroporation system may represent a promising method for the introduction of a wide variety of fluorophores, nanoparticles, quantum dots, DNAs and proteins into cells.
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Affiliation(s)
- S Homhuan
- Prince of Songkla University, Department of Physics, Hat Yai, Songkhla 90112, Thailand.
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Movahed S, Li D. Electrokinetic transport through the nanopores in cell membrane during electroporation. J Colloid Interface Sci 2012; 369:442-52. [DOI: 10.1016/j.jcis.2011.12.039] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2011] [Revised: 12/09/2011] [Accepted: 12/10/2011] [Indexed: 11/25/2022]
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Asavasanti S, Stroeve P, Barrett DM, Jernstedt JA, Ristenpart WD. Enhanced electroporation in plant tissues via low frequency pulsed electric fields: Influence of cytoplasmic streaming. Biotechnol Prog 2012; 28:445-53. [DOI: 10.1002/btpr.1507] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Revised: 11/15/2011] [Indexed: 11/11/2022]
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21
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Numerical simulation of molecular uptake via electroporation. Bioelectrochemistry 2011; 82:10-21. [DOI: 10.1016/j.bioelechem.2011.04.006] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2010] [Revised: 04/14/2011] [Accepted: 04/19/2011] [Indexed: 11/19/2022]
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Pakhomova ON, Gregory BW, Khorokhorina VA, Bowman AM, Xiao S, Pakhomov AG. Electroporation-induced electrosensitization. PLoS One 2011; 6:e17100. [PMID: 21347394 PMCID: PMC3036735 DOI: 10.1371/journal.pone.0017100] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2010] [Accepted: 01/19/2011] [Indexed: 01/27/2023] Open
Abstract
Background Electroporation is a method of disrupting the integrity of cell membrane by electric pulses (EPs). Electrical modeling is widely employed to explain and study electroporation, but even most advanced models show limited predictive power. No studies have accounted for the biological consequences of electroporation as a factor that alters the cell's susceptibility to forthcoming EPs. Methodology/Principal Findings We focused first on the role of EP rate for membrane permeabilization and lethal effects in mammalian cells. The rate was varied from 0.001 to 2,000 Hz while keeping other parameters constant (2 to 3,750 pulses of 60-ns to 9-µs duration, 1.8 to 13.3 kV/cm). The efficiency of all EP treatments was minimal at high rates and started to increase gradually when the rate decreased below a certain value. Although this value ranged widely (0.1–500 Hz), it always corresponded to the overall treatment duration near 10 s. We further found that longer exposures were more efficient irrespective of the EP rate, and that splitting a high-rate EP train in two fractions with 1–5 min delay enhanced the effects severalfold. Conclusions/Significance For varied experimental conditions, EPs triggered a delayed and gradual sensitization to EPs. When a portion of a multi-pulse exposure was delivered to already sensitized cells, the overall effect markedly increased. Because of the sensitization, the lethality in EP-treated cells could be increased from 0 to 90% simply by increasing the exposure duration, or the exposure dose could be reduced twofold without reducing the effect. Many applications of electroporation can benefit from accounting for sensitization, by organizing the exposure either to maximize sensitization (e.g., for sterilization) or, for other applications, to completely or partially avoid it. In particular, harmful side effects of electroporation-based therapies (electrochemotherapy, gene therapies, tumor ablation) include convulsions, pain, heart fibrillation, and thermal damage. Sensitization can potentially be employed to reduce these side effects while preserving or increasing therapeutic efficiency.
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Affiliation(s)
- Olga N. Pakhomova
- Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, Virginia, United States of America
| | - Betsy W. Gregory
- Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, Virginia, United States of America
| | - Vera A. Khorokhorina
- Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, Virginia, United States of America
| | - Angela M. Bowman
- Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, Virginia, United States of America
| | - Shu Xiao
- Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, Virginia, United States of America
- Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, Virginia, United States of America
| | - Andrei G. Pakhomov
- Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, Virginia, United States of America
- * E-mail:
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Asavasanti S, Ristenpart W, Stroeve P, Barrett DM. Permeabilization of Plant Tissues by Monopolar Pulsed Electric Fields: Effect of Frequency. J Food Sci 2010; 76:E98-111. [DOI: 10.1111/j.1750-3841.2010.01940.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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The effects of phase duration on defibrillation success of dual time constant biphasic waveforms. Resuscitation 2009; 81:236-41. [PMID: 19945206 DOI: 10.1016/j.resuscitation.2009.10.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2009] [Revised: 09/30/2009] [Accepted: 10/21/2009] [Indexed: 11/24/2022]
Abstract
AIM OF STUDY The effects of first and second phase duration of biphasic waveforms on defibrillation success were evaluated in a guinea pig model of ventricular fibrillation (VF). We hypothesized that waveform duration, and especially the first phase duration, played a main role on defibrillation efficacy in comparison to energy, current and voltage, when a dual time constant biphasic shock was employed. METHODS VF was induced and untreated for 5s in 30 male guinea pigs, prior to attempting a single defibrillatory shock with one of 5 defibrillation waveforms which had different durations of the first and second phase. A five step up-down protocol was utilized for determining the defibrillation efficacy. After a 3-min interval, the procedure was repeated. A total of 25 cardiac arrest events and defibrillations were investigated for each animal. RESULTS The defibrillation waveforms with an intermediate first phase of 5 ms, yielded the highest defibrillation success (p<0.05). These waveforms also presented significantly lower energy, current and voltage in comparison to waveforms with shorter or longer first phase durations (p<0.001). However, no differences on defibrillation success were observed among waveforms with different second phase durations varying from 1.5 ms to 3.5 ms. CONCLUSIONS For dual time constant biphasic waveforms, the first phase duration played a main role on defibrillation success. The intermediate first phase duration of 5 ms, yielded the best defibrillation efficacy compared with shorter or longer first phase durations. While the second phase duration did not affect defibrillation outcomes.
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Individual effect of components of defibrillation waveform on the contractile function and intracellular calcium dynamics of cardiomyocytes. Crit Care Med 2009; 37:2394-401. [PMID: 19531953 DOI: 10.1097/ccm.0b013e3181a02ea1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVES Although electrical shock is a unique and effective treatment for fatal arrhythmia, it produces myocardial dysfunction closely related to the intensity of shock delivered. The isolated contribution of defibrillator components to postshock contractile impairment is not yet securely established. We sought to evaluate contractile function in cardiomyocytes following electrical shocks with different peak currents, energies, and durations. We hypothesized that peak current may play a more important role than energy in determining postshock dysfunction. Prolongation of the duration may reduce contractile impairment. DESIGN Prospective, randomized, controlled study. SETTING University-affiliated research institute. SUBJECTS Male albino Sprague-Dawley rats. INTERVENTIONS We assigned 324 cardiomyocytes isolated from adult male rats to 11 groups having different waveforms (triangular and square), peak currents (derived from peak voltage gradients of 25 V/cm, 35.4 V/cm, 50 V/cm, 70.7 V/cm, and 100 V/cm), and durations (10 and 20 msecs) of shocks delivered. One single shock was given to each cardiomyocyte, and length shortening and Ca transients were recorded optically with fura-2 loading. MEASUREMENTS AND MAIN RESULTS Increase of peak current and corresponding energy caused more cells to have irregular beating (p < .001) and reduced length shortening (p < .001). This was associated with increased Ca abnormality (p < .05). Increasing peak current independent of energy significantly impaired postshock contractile function (p < .05), whereas the change of energy alone did not. Prolongation of duration independent of energy and peak current reduced postshock contractile impairment (p < .05). CONCLUSIONS Peak current may play a more determinative role in producing postshock contractile dysfunction than does energy.
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Wang M, Orwar O, Weber SG. Single-cell transfection by electroporation using an electrolyte/plasmid-filled capillary. Anal Chem 2009; 81:4060-7. [PMID: 19351139 DOI: 10.1021/ac900265f] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Single-cell transfection of adherent cells has been accomplished using single-cell electroporation (SCEP) with a pulled capillary. HEPES-buffered physiological saline solution containing pEGFP plasmid at a low concentration (0.16 approximately 0.78 microg/microL) filled a 15 cm long capillary with a tip opening of 2 microm. The electric field is applied to individual cells by bringing the tip close to the cell and subsequently applying one or two brief electric pulses. Many individual cells can thus be transfected with a small volume of plasmid-containing solution (approximately 1 microL). The extent of electroporation is determined by measuring the percentage loss of freely diffusing thiols (chiefly reduced glutathione) that have been derivatized with the fluorogenic ThioGlo 1. A mass transport model is used to fit the time-dependent fluorescence intensity decay in the target cells. The fits, which are excellent, yield the electroporation-induced fluorescence loss at steady state and the mass transfer rate through the electroporated cell membrane. Steady-state fluorescence loss ranged approximately from 0 to about 80% (based on the fluorescence intensity before electroporation). For the cells having a loss of thiol-ThioGlo 1 fluorescence intensity greater than 10% and mass transfer rate greater than 0.03 s(-1), EGFP fluorescence is observed after 24 h. The EGFP fluorescence is increased at 48 h. With a loss smaller than 10% and a mass transfer rate smaller than 0.03 s(-1), no EGFP fluorescence is detected. Thus, transfection success is closely related to the small molecule mass transport dynamics as indicated by the loss of fluorescence from thiol-ThioGlo 1 conjugates. The EGFP expression is weaker than bulk lipid-mediated transfection, as indicated by the EGFP fluorescence intensities. However, the success with the single-cell approach is considerably greater than lipid-mediated transfection.
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Affiliation(s)
- Manyan Wang
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, USA
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Electroporation in Biological Cell and Tissue: An Overview. ELECTROTECHNOLOGIES FOR EXTRACTION FROM FOOD PLANTS AND BIOMATERIALS 2009. [DOI: 10.1007/978-0-387-79374-0_1] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Ramachandran N, Jaroszeski M, Hoff AM. Molecular delivery to cells facilitated by corona ion deposition. IEEE Trans Nanobioscience 2008; 7:233-9. [PMID: 18779104 DOI: 10.1109/tnb.2008.2002290] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A novel method of inducing the delivery of nonpermeant molecules to the cytosol of cells is presented in this paper. Corona discharge in air was utilized to produce ions that in turn were deposited onto the liquid surface of media containing cultured cells. Murine B16 melanoma cells were used to demonstrate the molecular delivery of fluorescent dye calcein, the drug bleomycin, and a nucleic acid stain SYTOX-green. None of these molecules penetrate cells with intact membranes. Following the corona treatment, cells were observed to admit significant quantities of these molecules from the culture media, relative to control samples. Further, greater than 95% viability of treated cells was observed by Trypan Blue assay. This method may provide an attractive alternative to electroporation where a physical contact between electrodes and cells is needed to deliver molecules to the cytosol.
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Affiliation(s)
- Niraj Ramachandran
- Department of Chemical Engineering, University of South Florida, Tampa, FL 33620 USA
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Zaharoff DA, Henshaw JW, Mossop B, Yuan F. Mechanistic analysis of electroporation-induced cellular uptake of macromolecules. Exp Biol Med (Maywood) 2008; 233:94-105. [PMID: 18156311 DOI: 10.3181/0704-rm-113] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Pulsed electric field has been widely used as a nonviral gene delivery platform. The delivery efficiency can be improved through quantitative analysis of pore dynamics and intracellular transport of plasmid DNA. To this end, we investigated mechanisms of cellular uptake of macromolecules during electroporation. In the study, fluorescein isothiocyanate-labeled dextran (FD) with molecular weight of 4,000 (FD-4) or 2,000,000 (FD-2000) was added into suspensions of a murine mammary carcinoma cell (4T1) either before or at different time points (ie, 1, 2, or 10 sec) after the application of different pulsed electric fields (in high-voltage mode: 1.2-2.0 kV in amplitude, 99 microsec in duration, and 1-5 pulses; in low-voltage mode: 100-300 V in amplitude, 5-20 msec in duration, and 1-5 pulses). The intracellular concentrations of FD were quantified using a confocal microscopy technique. To understand transport mechanisms, a mathematical model was developed for numerical simulation of cellular uptake. We observed that the maximum intracellular concentration of FD-2000 was less than 3% of that in the pulsing medium. The intracellular concentrations increased linearly with pulse number and amplitude. In addition, the intracellular concentration of FD-2000 was approximately 40% lower than that of FD-4 under identical pulsing conditions. The numerical simulations predicted that the pores larger than FD-4 lasted <10 msec after the application of pulsed fields if the simulated concentrations were on the same order of magnitude as the experimental data. In addition, the simulation results indicated that diffusion was negligible for cellular uptake of FD molecules. Taken together, the data suggested that large pores induced in the membrane by pulsed electric fields disappeared rapidly after pulse application and convection was likely to be the dominant mode of transport for cellular uptake of uncharged macromolecules.
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Affiliation(s)
- David A Zaharoff
- Department of Biomedical Engineering, Duke University, 136 Hudson Hall, Durham, North Carolina 27708, USA
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Zudans I, Agarwal A, Orwar O, Weber SG. Numerical calculations of single-cell electroporation with an electrolyte-filled capillary. Biophys J 2007; 92:3696-705. [PMID: 17351001 PMCID: PMC1853140 DOI: 10.1529/biophysj.106.097683] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
An electric field is focused on one cell in single-cell electroporation. This enables selective electroporation treatment of the targeted cell without affecting its neighbors. While factors that lead to membrane permeation are the same as in bulk electroporation, quantitative description of the single-cell experiments is more complicated. This is due to the fact that the potential distribution cannot be solved analytically. We present single-cell electroporation with an electrolyte-filled capillary modeled with a finite element method. Potential is calculated in the capillary, the solution surrounding the cell, and the cell. The model enables calculation of the transmembrane potential and the fraction of the cell membrane that is above the critical electroporation potential. Electroporation at several cell-to-tip distances of human lung carcinoma cells (A549) stained with ThioGlo-1 demonstrated membrane permeation at distances shorter than approximately 7.0 microm. This agrees well with the model's prediction that a critical transmembrane potential of 250 mV is achieved when the capillary is approximately 6.5 microm or closer to the cell. Simulations predict that at short cell-to-tip distances, the transmembrane potential increases significantly while the total area of the cell above the critical potential increases only moderately.
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Affiliation(s)
- Imants Zudans
- University of Pittsburgh, Department of Chemistry, Pittsburgh, Pennsylvania, USA
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Peycheva E, Daskalov I, Tsoneva I. Electrochemotherapy of Mycosis fungoides by interferon-alpha. Bioelectrochemistry 2006; 70:283-6. [PMID: 17150416 DOI: 10.1016/j.bioelechem.2006.10.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2006] [Revised: 09/15/2006] [Accepted: 10/13/2006] [Indexed: 12/21/2022]
Abstract
Eight patients with 29 lesions of histologically verified 1st stage of Mycosis fungoides were successfully treated by electrochemotherapy with interferon-alpha. For this purpose 8 biphasic pulses were used, each of 50+50 micros duration with 900 micros interpulse intervals, resulting in a burst of 7.1 ms total duration. Compared to the traditional monoimmunotherapy with interferon-alpha applied three times weekly for a total of 4 weeks, the electrochemotherapy was very efficient. Complete response (CR) was observed in 25 (86%) of the 29 treated lesions by single-act electrochemotherapy with interferon-alpha. At the end of the 12-month period, all 29 lesions showed 100% complete response (CR). New lesions for a period of 12 months were not observed. The expected mechanism involved in multiple cytotoxic action of interferon-alpha could be the local increased concentration in the tumour and prolongation of the time of its action after the application of pulses.
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Affiliation(s)
- E Peycheva
- National Centre of Oncology, Clinic of Oncodermatology, 6 Plovdivsko pole Blv., 1756 Sofia, Bulgaria
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Vasilkoski Z, Esser AT, Gowrishankar TR, Weaver JC. Membrane electroporation: The absolute rate equation and nanosecond time scale pore creation. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2006; 74:021904. [PMID: 17025469 DOI: 10.1103/physreve.74.021904] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2005] [Indexed: 05/12/2023]
Abstract
The recent applications of nanosecond, megavolt-per-meter electric field pulses to biological systems show striking cellular and subcellular electric field induced effects and revive the interest in the biophysical mechanism of electroporation. We first show that the absolute rate theory, with experimentally based parameter input, is consistent with membrane pore creation on a nanosecond time scale. Secondly we use a Smoluchowski equation-based model to formulate a self-consistent theoretical approach. The analysis is carried out for a planar cell membrane patch exposed to a 10 ns trapezoidal pulse with 1.5 ns rise and fall times. Results demonstrate reversible supraelectroporation behavior in terms of transmembrane voltage, pore density, membrane conductance, fractional aqueous area, pore distribution, and average pore radius. We further motivate and justify the use of Krassowska's asymptotic electroporation model for analyzing nanosecond pulses, showing that pore creation dominates the electrical response and that pore expansion is a negligible effect on this time scale.
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Affiliation(s)
- Zlatko Vasilkoski
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Tryfona T, Bustard MT. Enhancement of biomolecule transport by electroporation: A review of theory and practical application to transformation ofCorynebacterium glutamicum. Biotechnol Bioeng 2006; 93:413-23. [PMID: 16224791 DOI: 10.1002/bit.20725] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Selective and reversible permeabilization of the cell wall permeability barrier is the focus for many biotechnological applications. In this article, the basic principles for reversible membrane permeabilization, based on biological, chemical, and physical methods are reviewed. Emphasis is given to electroporation (electropermeabilization) which tends to be the most popular method for membrane permeabilization and for introduction of foreign molecules into the cells. The applications of this method in industrial processes as well as the critical factors and parameters which affect the success of this approach are discussed. The different strategies developed throughout the years for increased transformation efficiencies of the industrially important amino acid-overproducing bacterium Corynebacterium glutamicum, are also summarized.
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Affiliation(s)
- Theodora Tryfona
- Chemical Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK
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35
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Ca ion permeation through liposome membranes with heat generation by square-wave electric field. Colloids Surf B Biointerfaces 2004. [DOI: 10.1016/j.colsurfb.2003.10.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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36
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Han F, Wang Y, Sims CE, Bachman M, Chang R, Li GP, Allbritton NL. Fast Electrical Lysis of Cells for Capillary Electrophoresis. Anal Chem 2003; 75:3688-96. [PMID: 14572031 DOI: 10.1021/ac0341970] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In the past decade, capillary electrophoresis has demonstrated increasing utility for the quantitative analysis of single cells. New applications for the analysis of dynamic cellular properties demand sampling methods with sufficient temporal resolution to accurately measure these processes. In particular, intracellular signaling pathways involving many enzymes can be modulated on subsecond time scales. We have developed a technique to rapidly lyse an adherent mammalian cell using a single electrical pulse followed by efficient loading of the cellular contents into a capillary. Microfabricated electrodes were designed to create a maximum voltage drop across the flattened cell's plasma membrane at a minimum interelectrode voltage. The influence of the interelectrode distance, pulse duration, and pulse strength on the rate of cell lysis was determined. The ability to rapidly lyse a cell and collect and separate the cellular contents was demonstrated by loading cells with Oregon Green and two isomers of carboxyfluorescein. All three fluorophores were detected with a separation efficiency comparable to that of standards. Parallel comparison of electrical lysis to that produced by a laser-based lysis system revealed that the sampling efficiencies of the two techniques were comparable. Rapid cell lysis by an electrical pulse may increase the application of capillary electrophoresis to the study of cellular dynamics requiring fast sampling times.
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Affiliation(s)
- Futian Han
- Department of Physiology and Biophysics, University of California, Irvine, California 92697, USA
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37
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Rols MP, Golzio M, Gabriel B, Teissié J. Factors controlling electropermeabilisation of cell membranes. Technol Cancer Res Treat 2002; 1:319-28. [PMID: 12625757 DOI: 10.1177/153303460200100502] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Electric field pulses are a new approach for drug and gene delivery for cancer therapy. They induce a localized structural alteration of cell membranes. The associated physical mechanisms are well explained and can be safely controlled. A position dependent modulation of the membrane potential difference is induced when an electric field is applied to a cell. Electric field pulses with an overcritical intensity evoke a local membrane alteration. A free exchange of hydrophilic low molecular weight molecules takes place across the membrane. A leakage of cytosolic metabolites and a loading of polar drugs into the cytoplasm are obtained. The fraction of the cell surface which is competent for exchange is a function of the field intensity. The level of local exchange is strongly controlled by the pulse duration and the number of successive pulses. The permeabilised state is long lived. Its lifetime is under the control of the cumulated pulse duration. Cell viability can be preserved. Gene transfer is obtained but its mechanism is not a free diffusion. Plasmids are electrophoretically accumulated against the permeabilised cell surface and form aggregates due to the field effect. After the pulses, several steps follow: translocation to the cytoplasm, traffic to the nucleus and expression. Molecular structural and metabolic changes in cells remain mostly poorly understood. Nevertheless, while most studies were established on cells in culture (in vitro), recent experiments show that similar effects are obtained on tissue (in vivo). Transfer remains controlled by the physical parameters of the electrical treatment.
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Affiliation(s)
- M P Rols
- IPBS UMR 5089 CNRS, 205 route de Narbonne, 31077 Toulouse, France
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