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https://www.readbyqxmd.com/read/28693898/nanosecond-pulsed-electric-fields-depolarize-transmembrane-potential-via-voltage-gated-k-ca-2-and-trpm8-channels-in-u87-glioblastoma-cells
#1
Ryan C Burke, Sylvia M Bardet, Lynn Carr, Sergii Romanenko, Delia Arnaud-Cormos, Philippe Leveque, Rodney P O'Connor
Nanosecond pulsed electric fields (nsPEFs) have a variety of applications in the biomedical and biotechnology industries. Cancer treatment has been at the forefront of investigations thus far as nsPEFs permeabilize cellular and intracellular membranes leading to apoptosis and necrosis. nsPEFs may also influence ion channel gating and have the potential to modulate cell physiology without poration of the membrane. This phenomenon was explored using live cell imaging and a sensitive fluorescent probe of transmembrane voltage in the human glioblastoma cell line, U87 MG, known to express a number of voltage-gated ion channels...
July 7, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28680807/calcium-dependent-activation-of-transglutaminase-2-by-nanosecond-pulsed-electric-fields
#2
Keiko Morotomi-Yano, Ken-Ichi Yano
Exposure of cultured human cells to nanosecond pulsed electric fields (nsPEFs) elicits various cellular events, including Ca(2+) influx and cell death. Recently, nsPEFs have been regarded as a novel physical treatment useful for biology and medicine, but the underlying mechanism of action remains to be fully elucidated. In this study, we investigated the effect of nsPEFs on transglutaminases (TGs), enzymes that catalyze covalent protein modifications such as protein-protein crosslinking. Cellular TG activity was monitored by conjugation of cellular proteins with biotin-cadaverine, a cell-permeable pseudosubstrate for TGs...
July 2017: FEBS Open Bio
https://www.readbyqxmd.com/read/28674780/delivery-devices-for-exposure-of-biological-cells-to-nanosecond-pulsed-electric-fields
#3
Malak Soueid, Martinus C F Dobbelaar, Sabrina Bentouati, Sylvia M Bardet, Rodney P O'Connor, Delphine Bessières, Jean Paillol, Philippe Leveque, Delia Arnaud-Cormos
In this paper, delivery devices for nanosecond pulsed electric field exposure of biological samples in direct contact with electrodes or isolated are presented and characterized. They are based on a modified electroporation cuvette and two transverse electromagnetic cells (TEM cells). The devices were used to apply pulses with high intensity (4.5 kV) and short durations (3 and 13 ns). The delivery devices were electromagnetically characterized in the frequency and time domains. Field intensities of around 5, 0...
July 4, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28674451/novel-interventional-management-of-hepatic-hydatid-cyst-with-nanosecond-pulses-on-experimental-mouse-model
#4
Xinhua Chen, Ruiqing Zhang, Tuerganaili Aji, Yingmei Shao, Yonggang Chen, Hao Wen
The nanosecond pulsed electric field (nsPEF) is investigated as an alternative plan for benign hepatic hydatid cyst. Altogether 72 C57B6 mice were included. Normal group (n = 12) had no parasite injection and the other 60 mice were used to induce hydatid cyst in liver by injecting protoscolices in portal vein. The liver hydatid cysts were exposed to nsPEF with different doses and then follow up. The standard surgery was performed as positive control. The hydatid cyst growth was monitored by ultrasound; the morphology was checked by gross anatomy and pathology was tested by H&E stain...
July 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28494437/nanosecond-pulsed-electric-field-induced-changes-in-cell-surface-charge-density
#5
Diganta Dutta, Xavier-Lewis Palmer, Anthony Asmar, Michael Stacey, Shizhi Qian
This study reports that the surface charge density changes in Jurkat cells with the application of single 60 nanosecond pulse electric fields, using atomic force microscopy. Using an atomic force microscope tip and Jurkat cells on silica in a 0.01M KCl ionic concentration, we were able to measure the interfacial forces, while also predicting surface charge densities of both Jurkat cell and silica surfaces. The most important finding is that the pulsing conditions varyingly reduced the cells' surface charge density...
September 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/28476039/nano-pulse-stimulation-nps-ablate-tumors-and-inhibit-lung-metastasis-on-both-canine-spontaneous-osteosarcoma-and-murine-transplanted-hepatocellular-carcinoma-with-high-metastatic-potential
#6
Xinhua Chen, Yiling Chen, Jianwen Jiang, Liming Wu, Shengyong Yin, Xudong Miao, Robert J Swanson, Shusen Zheng
BACKGROUND: Nanosecond pulsed electric field (nsPEF), which is also termed as nano-pulse stimulation (NPS), has the potential of stimulating immune responses toward cancer cells. The current study investigates its local and systemic antitumor efficacy in vivo in late stage tumors with lung metastasis. METHOD: The 12 canines with spontaneous osteosarcomas and 12 nude mice transplanted with human hepatocellular carcinoma were divided randomly and were given NPS treatment, surgery or no treatment control...
July 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28467607/environmental-temperature-affects-physiology-and-survival-of-nanosecond-pulsed-electric-field-treated-cells
#7
Shengyong Yin, Xudong Miao, Xueming Zhang, Xinhua Chen, Hao Wen
Nanosecond pulsed electric field (nsPEF) is a novel non-thermal tumor ablation technique. However, how nsPEF affect cell physiology at different environmental temperature is still kept unknown. But this issue is of critical clinical practice relevance. This work aim to investigate how nsPEF treated cancer cells react to different environmental temperatures (0, 4, 25, and 37°C). Their cell viability, apoptosis, mitochondrial membrane potential, and reactive oxygen species (ROS) were examined. Lower temperature resulted in higher apoptosis rate, decreased mitochondria membrane potential, and increased ROS levels...
May 3, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28432032/neuronal-excitation-and-permeabilization-by-200-ns-pulsed-electric-field-an-optical-membrane-potential-study-with-fluovolt-dye
#8
Andrei G Pakhomov, Iurii Semenov, Maura Casciola, Shu Xiao
Electric field pulses of nano- and picosecond duration are a novel modality for neurostimulation, activation of Ca(2+) signaling, and tissue ablation. However it is not known how such brief pulses activate voltage-gated ion channels. We studied excitation and electroporation of hippocampal neurons by 200-ns pulsed electric field (nsPEF), by means of time-lapse imaging of the optical membrane potential (OMP) with FluoVolt dye. Electroporation abruptly shifted OMP to a more depolarized level, which was reached within <1ms...
July 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28393078/technological-and-theoretical-aspects-for-testing-electroporation-on-liposomes
#9
Agnese Denzi, Elena Della Valle, Gianluca Esposito, Lluis M Mir, Francesca Apollonio, Micaela Liberti
Recently, the use of nanometer liposomes as nanocarriers in drug delivery systems mediated by nanoelectroporation has been proposed. This technique takes advantage of the possibility of simultaneously electroporating liposomes and cell membrane with 10-nanosecond pulsed electric fields (nsPEF) facilitating the release of the drug from the liposomes and at the same time its uptake by the cells. In this paper the design and characterization of a 10 nsPEF exposure system is presented, for liposomes electroporation purposes...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28365791/elasticity-and-tumorigenic-characteristics-of-cells-in-a-monolayer-after-nanosecond-pulsed-electric-field-exposure
#10
A Steuer, K Wende, P Babica, J F Kolb
Nanosecond pulsed electric fields (nsPEFs) applied to cells can induce different biological effects depending on pulse duration and field strength. One known process is the induction of apoptosis whereby nsPEFs are currently investigated as a novel cancer therapy. Another and probably related change is the breakdown of the cytoskeleton. We investigated the elasticity of rat liver epithelial cells WB-F344 in a monolayer using atomic force microscopy (AFM) with respect to the potential of cells to undergo malignant transformation or to develop a potential to metastasize...
April 1, 2017: European Biophysics Journal: EBJ
https://www.readbyqxmd.com/read/28236173/nanosecond-pulsed-electric-field-nspef-disrupts-the-structure-and-metabolism-of-human-echinococcus-granulosus-protoscolex-in-vitro-with-a-dose-effect
#11
Ruiqing Zhang, Tuerganaili Aji, Yingmei Shao, Tiemin Jiang, Lei Yang, Weimin Lv, Yonggang Chen, Xinhua Chen, Hao Wen
The number of interventional treatments for hepatic cystic echinococcosis is increasing, but the chemicals or high temperatures used in these methodologies cause biliary complications, thus limiting their clinical applications. This experimental study aimed to apply a novel, non-thermal, non-chemical ablation method termed nanosecond pulsed electric field (nsPEF) for the treatment of human hepatic cystic echinococcosis. The nsPEF treatment parameters against protoscolices from human hepatic cystic echinococcosis were optimized in vitro...
April 2017: Parasitology Research
https://www.readbyqxmd.com/read/28228843/a-new-mechanism-for-efficient-hydrocarbon-electro-extraction-from-botryococcus-braunii
#12
Alexis Guionet, Bahareh Hosseini, Justin Teissié, Hidenori Akiyama, Hamid Hosseini
BACKGROUND: Recent understanding that specific algae have high hydrocarbon production potential has attracted considerable attention. Botryococcus braunii is a microalga with an extracellular hydrocarbon matrix, which makes it an appropriate green energy source. RESULTS: This study focuses on extracting oil from the microalgae matrix rather than the cells, eliminating the need for an excessive electric field to create electro-permeabilization. In such a way, technical limitations due to high extraction energy and cost can be overcome...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28147680/miniaturized-two-stack-blumlein-pulser-with-a-variable-repetition-rate-for-non-thermal-irreversible-electroporation-experiments
#13
Sun-Hong Min, Ohjoon Kwon, Matlabjon Sattorov, In-Keun Baek, Seontae Kim, Jin-Young Jeong, Dongpyo Hong, Seunghyuk Park, Gun-Sik Park
Non-thermal irreversible electroporation (NTIRE) to avoid thermal damage to cells during intense DC ns pulsed electric fields (nsPEFs) is a recent modality for medical applications. This mechanism, related to bioelectrical dynamics of the cell, is linked to the effect of a DC electric field and a threshold effect with an electrically stimulated membrane for the charge distribution in the cell. To create the NTIRE condition, the pulse width of the nsPEF should be shorter than the charging time constant of the membrane related to the cell radius, membrane capacitance, cytoplasm resistivity, and medium resistivity...
January 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28117459/calcium-independent-disruption-of-microtubule-dynamics-by-nanosecond-pulsed-electric-fields-in-u87-human-glioblastoma-cells
#14
Lynn Carr, Sylvia M Bardet, Ryan C Burke, Delia Arnaud-Cormos, Philippe Leveque, Rodney P O'Connor
High powered, nanosecond duration, pulsed electric fields (nsPEF) cause cell death by a mechanism that is not fully understood and have been proposed as a targeted cancer therapy. Numerous chemotherapeutics work by disrupting microtubules. As microtubules are affected by electrical fields, this study looks at the possibility of disrupting them electrically with nsPEF. Human glioblastoma cells (U87-MG) treated with 100, 10 ns, 44 kV/cm pulses at a frequency of 10 Hz showed a breakdown of their interphase microtubule network that was accompanied by a reduction in the number of growing microtubules...
January 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28065834/nanosecond-pulsed-electric-fields-trigger-cell-differentiation-in-chlamydomonas-reinhardtii
#15
Fan Bai, Christian Gusbeth, Wolfgang Frey, Peter Nick
Nanosecond pulsed electric fields (nsPEFs) have great potential for biotechnological and medical applications. However, the biological mechanisms causing the cellular responses are still far from understood. We used the unicellular green algae Chlamydomonas reinhardtii as experimental model to dissect the immediate consequences of electroporation from the developmental cellular responses evoked by nsPEFs. We observe that nsPEFs induce a short-term permeabilization of the membrane, accompanied by swelling and oxidative burst...
January 6, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28058631/induction-of-apoptosis-of-liver-cancer-cells-by-nanosecond-pulsed-electric-fields-nspefs
#16
Ling He, Deyou Xiao, Jianguo Feng, Chenguo Yao, Liling Tang
The application of nanosecond pulsed electric fields (nsPEFs) is a novel method to induce the death of cancer cells. NsPEFs could directly function on the cell membrane and activate the apoptosis pathways, then induce apoptosis in various cell lines. However, the nsPEFs-inducing-apoptosis action sites and the exact pathways are not clear now. In this study, nsPEFs were applied to the human liver cancer cells HepG2 with different parameters. By apoptosis assay, morphological observation, detecting the mitochondrial membrane potential (ΔΨ m), intracellular calcium ion concentration ([Ca(2+)]i) and the expressions of key apoptosis factors, we demonstrated that nsPEFs could induce the morphology of cell apoptosis, the change in ΔΨ m, [Ca(2+)]i and the upregulation of some key apoptosis factors, which revealed the responses of liver cancer cells and indicated that cells may undergo apoptosis through the mitochondria-dependent pathway after nsPEFs were applied...
February 2017: Medical Oncology
https://www.readbyqxmd.com/read/28054548/nanosecond-pulsed-electric-fields-enhance-the-anti-tumour-effects-of-the-mtor-inhibitor-everolimus-against-melanoma
#17
Jie Dai, Shan Wu, Yan Kong, Zhihong Chi, Lu Si, Xinan Sheng, Chuanliang Cui, Jing Fang, Jue Zhang, Jun Guo
The PI3K/mTOR/AKT pathway is activated in most melanomas, but mTOR inhibitors used singly have limited activity against advanced melanomas. The application of nanosecond pulsed electric fields (nsPEFs) is a promising cancer therapy approach. In this study, we evaluated the synergistic anti-tumour efficacy of the mTOR inhibitor everolimus in conjunction with nsPEFs against melanoma. The combined treatment of nsPEFs and everolimus gradually decreased cell growth concurrent with nsPEF intensity. nsPEFs alone or combined with everolimus could promote melanoma cell apoptosis, accompanied with a loss in cellular mitochondrial membrane potential and an increase in Ca(2+) levels...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/27986976/selective-susceptibility-to-nanosecond-pulsed-electric-field-nspef-across-different-human-cell-types
#18
Elena C Gianulis, Chantelle Labib, Gintautas Saulis, Vitalij Novickij, Olga N Pakhomova, Andrei G Pakhomov
Tumor ablation by nanosecond pulsed electric fields (nsPEF) is an emerging therapeutic modality. We compared nsPEF cytotoxicity for human cell lines of cancerous (IMR-32, Hep G2, HT-1080, and HPAF-II) and non-cancerous origin (BJ and MRC-5) under strictly controlled and identical conditions. Adherent cells were uniformly treated by 300-ns PEF (0-2000 pulses, 1.8 kV/cm, 50 Hz) on indium tin oxide-covered glass coverslips, using the same media and serum. Cell survival plotted against the number of pulses displayed three distinct regions (initial resistivity, logarithmic survival decline, and residual resistivity) for all tested cell types, but with differences in LD50 spanning as much as nearly 80-fold...
December 16, 2016: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/27698479/multiphoton-imaging-reveals-that-nanosecond-pulsed-electric-fields-collapse-tumor-and-normal-vascular-perfusion-in-human-glioblastoma-xenografts
#19
Sylvia M Bardet, Lynn Carr, Malak Soueid, Delia Arnaud-Cormos, Philippe Leveque, Rodney P O'Connor
Despite the biomedical advances of the last century, many cancers including glioblastoma are still resistant to existing therapies leaving patients with poor prognoses. Nanosecond pulsed electric fields (nsPEF) are a promising technology for the treatment of cancer that have thus far been evaluated in vitro and in superficial malignancies. In this paper, we develop a tumor organoid model of glioblastoma and apply intravital multiphoton microscopy to assess their response to nsPEFs. We demonstrate for the first time that a single 10 ns, high voltage electric pulse (35-45 kV/cm), collapses the perfusion of neovasculature, and also alters the diameter of capillaries and larger vessels in normal tissue...
October 4, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27676191/radiosensitization-of-oral-tongue-squamous-cell-carcinoma-by-nanosecond-pulsed-electric-fields-nspefs
#20
Jinsong Guo, Yu Wang, Jing Wang, Jue Zhang, Jing Fang
Nanosecond pulsed electric fields (nsPEFs) are a non-thermal and non-toxic technology that induce a myriad of biological effects. They have been proven to be effective in tumor shrinkage, but few studies focus on its radiosensitization in oral tongue squamous cell carcinoma. The purpose of this research was to study the radiosensitization effect of nsPEFs on a human oral tongue cancer cell line Tca8113 and to investigate the potential antitumor mechanism. A Tca8113 cell line was tested respectively by MTT assay, clonogenic assay, flow cytometry assay, annexin V-FITC/PI assay, mitochondrial potential assay and total nitric oxide assay...
February 2017: Bioelectrochemistry
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