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Neyama D, Fakhruddin SMB, Inoue KY, Kurita H, Osana S, Miyamoto N, Tayama T, Chiba D, Watanabe M, Shiku H, Narita F. Batteryless wireless magnetostrictive Fe 30Co 70/Ni clad plate for human coronavirus 229E detection. Sens Actuators A Phys 2023; 349:114052. [PMID: 36447950 PMCID: PMC9686060 DOI: 10.1016/j.sna.2022.114052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 10/21/2022] [Accepted: 11/23/2022] [Indexed: 06/16/2023]
Abstract
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been garnered increasing for its rapid worldwide spread. Each country had implemented city-wide lockdowns and immigration regulations to prevent the spread of the infection, resulting in severe economic consequences. Materials and technologies that monitor environmental conditions and wirelessly communicate such information to people are thus gaining considerable attention as a countermeasure. This study investigated the dynamic characteristics of batteryless magnetostrictive alloys for energy harvesting to detect human coronavirus 229E (HCoV-229E). Light and thin magnetostrictive Fe-Co/Ni clad plate with rectification, direct current (DC) voltage storage capacitor, and wireless information transmission circuits were developed for this purpose. The power consumption was reduced by improving the energy storage circuit, and the magnetostrictive clad plate under bending vibration stored a DC voltage of 1.9 V and wirelessly transmitted a signal to a personal computer once every 5 min and 10 s under bias magnetic fields of 0 and 10 mT, respectively. Then, on the clad plate surface, a novel CD13 biorecognition layer was immobilized using a self-assembled monolayer of -COOH groups, thus forming an amide bond with -NH2 groups for the detection of HCoV-229E. A bending vibration test demonstrated the resonance frequency changes because of HCoV-229E binding. The fluorescence signal demonstrated that HCoV-229E could be successfully detected. Thus, because HCoV-229E changed the dynamic characteristics of this plate, the CD13-modified magnetostrictive clad plate could detect HCoV-229E from the interval of wireless communication time. Therefore, a monitoring system that transmits/detects the presence of human coronavirus without batteries will be realized soon.
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Key Words
- AC, alternating current
- APS, aminopropyl silane
- BSA, bovine serum albumin
- CD13
- CTF, corrected total fluorescence
- DC, direct current
- EDC, 1-Ethyl-3-(3-dimethylaminopropyl) carbodiimide
- Energy harvesting
- Fluorescence microscopy
- HCoV, human coronavirus
- IC, integrated circuit
- IoT, Internet of things
- MES, 2-(N-morpholino) ethanesulfonic acid
- MUA, mercaptoundecanoic acid
- NHS, N-hydroxysulfosuccinimide
- PBS, phosphate-buffered saline
- RC, rectifier circuit
- SAM, self-assembled monolayer
- SARS-CoV-2, Severe Acute Respiratory Syndrome Coronavirus 2
- Virrari effect
- Virus detection
- Wireless communications
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Affiliation(s)
- Daiki Neyama
- Department of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai, Japan
| | - Siti Masturah Binti Fakhruddin
- Department of Frontier Sciences for Advanced Environment, Graduate School of Environmental Studies, Tohoku University, Sendai, Japan
| | - Kumi Y Inoue
- Department of Frontier Sciences for Advanced Environment, Graduate School of Environmental Studies, Tohoku University, Sendai, Japan
- Center for Basic Education, Faculty of Engineering, Graduate Faculty of Interdisciplinary Research, University of Yamanashi, Kofu, Japan
| | - Hiroki Kurita
- Department of Frontier Sciences for Advanced Environment, Graduate School of Environmental Studies, Tohoku University, Sendai, Japan
| | - Shion Osana
- Division of Biomedical Engineering for Health and Welfare, Graduate School of Biomedical Engineering, Tohoku University, Sendai, Japan
| | - Naoto Miyamoto
- New Industry Creation Hatchery Center, Tohoku University, Sendai, Japan
| | - Tsuyoki Tayama
- Advanced Material Division, Tohoku Steel Co. Ltd., Muratamachi, Shibatagun, Japan
| | - Daiki Chiba
- Advanced Material Division, Tohoku Steel Co. Ltd., Muratamachi, Shibatagun, Japan
| | - Masahito Watanabe
- Research and Development Department, Tohoku Steel Co. Ltd., Muratamachi, Shibatagun, Japan
| | - Hitoshi Shiku
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Sendai, Japan
| | - Fumio Narita
- Department of Frontier Sciences for Advanced Environment, Graduate School of Environmental Studies, Tohoku University, Sendai, Japan
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Hooshfar S, Tchu S, Yun C, Lynch KL. Development of a high-throughput differential mobility separation-tandem mass spectrometry (DMS-MS/MS) method for clinical urine drug testing. J Mass Spectrom Adv Clin Lab 2022; 23:50-57. [PMID: 35036987 PMCID: PMC8753179 DOI: 10.1016/j.jmsacl.2021.12.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Revised: 12/21/2021] [Accepted: 12/30/2021] [Indexed: 11/29/2022] Open
Abstract
INTRODUCTION Differential mobility separation (DMS) is an analytical technique used for rapid separation of ions and isomers based on gas phase mobility prior to entering a mass spectrometer for analysis. The entire DMS process is accomplished in fewer than 20 ms and can be used as a rapid alternative to chromatographic separation. OBJECTIVE The primary objective was to evaluate the utility of DMS-tandem mass spectrometry (DMS-MS/MS) as a replacement for immunoassay-based clinical toxicology testing. METHODS A sensitive DMS-MS/MS method was developed and validated for simultaneous identification of 33 drugs and metabolites in human urine samples. After DMS optimization, the method was validated and used to screen 56 clinical urine samples. These results were compared to results obtained by immunoassay. RESULTS The DMS-MS/MS method achieved limits of detection ranging from 5 to 100 ng/mL. Moreover, the total analysis time was 2 min per sample. For the method performance evaluation, DMS-MS/MS results were compared with previously obtained urine toxicology immunoassay results. DMS-MS/MS showed higher sensitivity and identified 20% more drugs in urine, which were confirmed by LC-MS/MS. CONCLUSION The DMS-MS/MS as applied in our lab demonstrated the capability for rapid drug screening and provided better analytical performance than immunoassay.
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Key Words
- 6-MAM, 6-Monoacetylmorphine
- AMPH, amphetamines/ecstasy
- BENZ, benzodiazepines
- BUPR, buprenorphine
- CE, Collision energy
- COV, compensation voltage
- CXP, collision cell exit potential
- DAPPI, atmospheric pressure photo ionization
- DART, direct analysis in real time
- DC, direct current
- DESI, desorption electrospray ionization
- DMO, DMS offse
- DMS, differential mobility separation
- DP, declustering potential
- DR, DMS resolution enhancement
- DT, DMS cell temperature
- Differential mobility separation
- Drugs of abuse
- EDDP, 2-ethylidene1,5-dimethyl-3,3-diphenylpyrrolidine
- EP, entrance potential
- FAIMS, field asymmetric waveform ion mobility spectrometry
- FSI, fiber spray ionization
- GC-MS or LC-MS, gas chromatography- or liquid chromatography-mass spectrometry
- GS1, ion source gas 1
- GS2, ion source gas 2
- IMS, ion mobility spectrometry, IS, internal standards, LOD, limit of detection, MD, modifier, MDC, modifier composition, ME, matrix effects
- MRM, multiple reaction monitoring
- MS/MS, tandem mass spectrometry
- Mass spectrometry
- OPI, opiates
- OXY, oxycodone/oxmorphone
- QCs, quality controls
- SRM, selected reaction monitoring
- SV, separation voltage
- Urine drug screening
- WT-ESI, wooden-tip electrospray ionization
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Affiliation(s)
- Shirin Hooshfar
- Department of Laboratory Medicine, University of California San Francisco, San Francisco, CA, United States
- Department of Drug Metabolism and Pharmacokinetics, Eisai Inc., Cambridge, MA, United States
| | - Simone Tchu
- Department of Laboratory Medicine, University of California San Francisco, San Francisco, CA, United States
| | - Cassandra Yun
- Department of Laboratory Medicine, University of California San Francisco, San Francisco, CA, United States
| | - Kara L Lynch
- Department of Laboratory Medicine, University of California San Francisco, San Francisco, CA, United States
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Dixon RV, Skaria E, Lau WM, Manning P, Birch-Machin MA, Moghimi SM, Ng KW. Microneedle-based devices for point-of-care infectious disease diagnostics. Acta Pharm Sin B 2021; 11:2344-2361. [PMID: 34150486 PMCID: PMC8206489 DOI: 10.1016/j.apsb.2021.02.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 11/25/2020] [Accepted: 01/28/2021] [Indexed: 02/08/2023] Open
Abstract
Recent infectious disease outbreaks, such as COVID-19 and Ebola, have highlighted the need for rapid and accurate diagnosis to initiate treatment and curb transmission. Successful diagnostic strategies critically depend on the efficiency of biological sampling and timely analysis. However, current diagnostic techniques are invasive/intrusive and present a severe bottleneck by requiring specialist equipment and trained personnel. Moreover, centralised test facilities are poorly accessible and the requirement to travel may increase disease transmission. Self-administrable, point-of-care (PoC) microneedle diagnostic devices could provide a viable solution to these problems. These miniature needle arrays can detect biomarkers in/from the skin in a minimally invasive manner to provide (near-) real-time diagnosis. Few microneedle devices have been developed specifically for infectious disease diagnosis, though similar technologies are well established in other fields and generally adaptable for infectious disease diagnosis. These include microneedles for biofluid extraction, microneedle sensors and analyte-capturing microneedles, or combinations thereof. Analyte sampling/detection from both blood and dermal interstitial fluid is possible. These technologies are in their early stages of development for infectious disease diagnostics, and there is a vast scope for further development. In this review, we discuss the utility and future outlook of these microneedle technologies in infectious disease diagnosis.
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Key Words
- AC, alternating current
- APCs, antigen-presenting cells
- ASSURED, affordable, sensitive, specific, user-friendly, rapid and robust, equipment-free and deliverable to end-users
- Biomarker detection
- Biosensor
- CMOS, complementary metal-oxide semiconductor
- COVID, coronavirus disease
- COVID-19
- CSF, cerebrospinal fluid
- CT, computerised tomography
- CV, cyclic voltammetry
- DC, direct current
- DNA, deoxyribonucleic acid
- DPV, differential pulse voltammetry
- EBV, Epstein–Barr virus
- EDC/NHS, 1-ethyl-3-(3-dimethylaminoproply) carbodiimide/N-hydroxysuccinimide
- ELISA, enzyme-linked immunosorbent assay
- GOx, glucose oxidase
- HIV, human immunodeficiency virus
- HPLC, high performance liquid chromatography
- HRP, horseradish peroxidase
- IP, iontophoresis
- ISF, interstitial fluid
- IgG, immunoglobulin G
- Infectious disease
- JEV, Japanese encephalitis virus
- MN, microneedle
- Microneedle
- NA, nucleic acid
- OBMT, one-touch-activated blood multidiagnostic tool
- OPD, o-phenylenediamine
- PCB, printed circuit board
- PCR, polymerase chain reaction
- PDMS, polydimethylsiloxane
- PEDOT, poly(3,4-ethylenedioxythiophene)
- PNA, peptide nucleic acid
- PP, polyphenol
- PPD, poly(o-phenylenediamine)
- PoC, point-of-care
- Point-of-care diagnostics (PoC)
- SALT, skin-associated lymphoid tissue
- SAM, self-assembled monolayer
- SEM, scanning electron microscope
- SERS, surface-enhanced Raman spectroscopy
- SWV, square wave voltammetry
- Skin
- TB, tuberculosis
- UV, ultraviolet
- VEGF, vascular endothelial growth factor
- WHO, World Health Organisation
- cfDNA, cell-free deoxyribonucleic acid
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Affiliation(s)
- Rachael V. Dixon
- School of Pharmacy, Faculty of Medical Sciences, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK
- Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle Upon Tyne NE2 4HH, UK
| | - Eldhose Skaria
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PT, UK
| | - Wing Man Lau
- School of Pharmacy, Faculty of Medical Sciences, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK
- Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle Upon Tyne NE2 4HH, UK
| | - Philip Manning
- Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle Upon Tyne NE2 4HH, UK
| | - Mark A. Birch-Machin
- Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle Upon Tyne NE2 4HH, UK
| | - S. Moein Moghimi
- School of Pharmacy, Faculty of Medical Sciences, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK
- Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle Upon Tyne NE2 4HH, UK
| | - Keng Wooi Ng
- School of Pharmacy, Faculty of Medical Sciences, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK
- Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle Upon Tyne NE2 4HH, UK
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Ma C, Nikiforov A, De Geyter N, Dai X, Morent R, Ostrikov KK. Future antiviral polymers by plasma processing. Prog Polym Sci 2021; 118:101410. [PMID: 33967350 PMCID: PMC8085113 DOI: 10.1016/j.progpolymsci.2021.101410] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 01/11/2021] [Accepted: 04/22/2021] [Indexed: 12/31/2022]
Abstract
Coronavirus disease 2019 (COVID-19) is largely threatening global public health, social stability, and economy. Efforts of the scientific community are turning to this global crisis and should present future preventative measures. With recent trends in polymer science that use plasma to activate and enhance the functionalities of polymer surfaces by surface etching, surface grafting, coating and activation combined with recent advances in understanding polymer-virus interactions at the nanoscale, it is promising to employ advanced plasma processing for smart antiviral applications. This trend article highlights the innovative and emerging directions and approaches in plasma-based surface engineering to create antiviral polymers. After introducing the unique features of plasma processing of polymers, novel plasma strategies that can be applied to engineer polymers with antiviral properties are presented and critically evaluated. The challenges and future perspectives of exploiting the unique plasma-specific effects to engineer smart polymers with virus-capture, virus-detection, virus-repelling, and/or virus-inactivation functionalities for biomedical applications are analysed and discussed.
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Key Words
- ACE2, angiotensin-converting enzyme 2
- Antiviral polymers
- BSA, bovine serum albumin
- CF4, tetrafluoromethane
- COVID-19, coronavirus disease 2019
- DC, direct current
- H2, hydrogen
- HBV, hepatitis B virus
- HMDSO, hexamethyldisiloxane
- IPNpp, plasma polymerized isopentyl nitrite
- MERS-CoV, middle east respiratory syndrome
- MW, microwave
- NO, nitric oxide
- PC, polycarbonate
- PDMS, polydimethylsiloxane
- PECVD, plasma-enhanced chemical vapour deposition
- PEG, polyethene glycol
- PET, polyethene terephthalate
- PFM, pentafluorophenyl methacrylate
- PP, polypropylene
- PPE, personal protective equipment
- PS, polystyrene
- PTFE, polytetrafluoroethylene
- PVC, polyvinyl chloride
- REF, reference
- RF, radio frequency
- RONS, reactive oxygen and nitrogen species
- RSV, respiratory syncytial virus
- RT-PCR, reverse transcription-polymerase chain reaction
- RV, rhinovirus
- SARS-CoV-2, severe acute respiratory syndrome coronavirus 2
- SEM, scanning electron microscopy
- TEOS-O2, tetraethyl orthosilicate and oxygen
- UV, ultraviolet
- WCA, water contact angle
- plasma processing
- surface modification
- ΔD, the variation of the dissipation
- Δf, the frequency shift
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Affiliation(s)
- Chuanlong Ma
- Research Unit Plasma Technology (RUPT), Department of Applied Physics, Ghent University, Sint-Pietersnieuwstraat 41, B4, 9000 Ghent, Belgium
| | - Anton Nikiforov
- Research Unit Plasma Technology (RUPT), Department of Applied Physics, Ghent University, Sint-Pietersnieuwstraat 41, B4, 9000 Ghent, Belgium
| | - Nathalie De Geyter
- Research Unit Plasma Technology (RUPT), Department of Applied Physics, Ghent University, Sint-Pietersnieuwstraat 41, B4, 9000 Ghent, Belgium
| | - Xiaofeng Dai
- Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, China
- Wuxi School of Medicine, Jiangnan University, Wuxi, 214122, China
| | - Rino Morent
- Research Unit Plasma Technology (RUPT), Department of Applied Physics, Ghent University, Sint-Pietersnieuwstraat 41, B4, 9000 Ghent, Belgium
| | - Kostya Ken Ostrikov
- School of Chemistry and Physics and QUT Centre for Materials Science, Queensland University of Technology (QUT), 4000 Brisbane, Australia
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Alsaleh M, Barbera TA, Andrews RH, Sithithaworn P, Khuntikeo N, Loilome W, Yongvanit P, Cox IJ, Syms RR, Holmes E, Taylor–Robinson SD. Mass Spectrometry: A Guide for the Clinician. J Clin Exp Hepatol 2019; 9:597-606. [PMID: 31695250 PMCID: PMC6823691 DOI: 10.1016/j.jceh.2019.04.053] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Accepted: 04/30/2019] [Indexed: 12/12/2022] Open
Abstract
Metabolic profiling, metabonomics and metabolomics are terms coined in the late 1990s as they emerged as the newest 'omics' technology at the time. This line of research enquiry uses spectroscopic analytical platforms, which are mainly nuclear magnetic resonance spectroscopy and mass spectrometry (MS), to acquire a snapshot of metabolites, the end products of a complex biological system. Metabolic profiling enables the detection, quantification and characterisation of metabolites in biofluids, cells and tissues. The source of these compounds can be of endogenous, microbial or exogenous origin, such as dietary or xenobiotic. This results in generating extensive, multivariate spectroscopic data that require specific statistical manipulation, typically performed using chemometric and pattern recognition techniques to reduce its dimensions, facilitate its biological interpretation and allow sample classification and biomarker discovery. Consequently, it is possible to study the dynamic metabolic changes in response to disease, intervention or environmental conditions. In this review, we describe the fundamentals of MS so that clinicians can be literate in the field and are able to interrogate the right scientific questions.
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Key Words
- CID, collision-induced dissociation
- DC, direct current
- ESI, electrospray ionisation
- FC, fold change
- GC, gas chromatography
- HILIC, hydrophilic interaction liquid chromatography
- LC, liquid chromatography
- MS, mass spectrometry
- MWA, metabolome-wide association
- NMR, nuclear magnetic resonance
- OPLS-DA, orthogonal partial least squared-discriminant analysis
- PC, principal component
- PCA, principal components analysis
- Q-TOF, quadrupole coupled with time-of-flight
- RF, radio frequency
- RP, reversed-phase
- UPLC, ultra-performance liquid chromatography
- VIP, variable importance of projection
- mass spectroscopy
- mass-charge ratio
- metabolic profiling
- metabolomics
- targeted profiling
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Affiliation(s)
- Munirah Alsaleh
- Division of Surgery and Cancer, Imperial College London, London, W2 INY, United Kingdom
| | - Thomas A. Barbera
- Division of Surgery and Cancer, Imperial College London, London, W2 INY, United Kingdom
| | - Ross H. Andrews
- Division of Surgery and Cancer, Imperial College London, London, W2 INY, United Kingdom,Cholangiocarcinoma Research Centre, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Paiboon Sithithaworn
- Cholangiocarcinoma Research Centre, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Narong Khuntikeo
- Cholangiocarcinoma Research Centre, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Watcharin Loilome
- Cholangiocarcinoma Research Centre, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Puangrat Yongvanit
- Cholangiocarcinoma Research Centre, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Isobel J. Cox
- Institute of Hepatology London, Foundation for Liver Research, 111 Coldharbour Lane, London SE5 9NT, United Kingdom,Faculty Pf Life Sciences & Medicine, King's College London, United Kingdom
| | - Richard R.A. Syms
- Department of Electrical and Electronic Engineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - Elaine Holmes
- Division of Surgery and Cancer, Imperial College London, London, W2 INY, United Kingdom
| | - Simon D. Taylor–Robinson
- Division of Surgery and Cancer, Imperial College London, London, W2 INY, United Kingdom,Address for correspondence. Professor Simon Taylor-Robinson Liver Unit, St. Mary's Hospital, London, W2 1NY, United Kingdom. Tel.: +44 203 312 6199; fax: +44 207 924 9369.
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Di G, Gu X, Lin Q, Wu S, Kim HB. A comparative study on effects of static electric field and power frequency electric field on hematology in mice. Ecotoxicol Environ Saf 2018; 166:109-115. [PMID: 30253285 DOI: 10.1016/j.ecoenv.2018.09.071] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 09/14/2018] [Accepted: 09/15/2018] [Indexed: 06/08/2023]
Abstract
With the development of the ultra high voltage transmission technology, the voltage level of transmission line rised. Accordingly, the strength of electric field in the vicinity of transmission line increased, thus possible health effects from electric field have caused many public attentions. In this study, in order to compare effects induced by static electric field (SEF) and power frequency electric field (PFEF) on immune function, Institute of Cancer Research (ICR) mice were exposed to 35 kV/m SEF (0 Hz) and PFEF (50 Hz),respectively. Several indicators of white blood cell, red blood cell as well as hemoglobin in peripheral blood were tested after exposure of 7, 14 and 21 days, respectively. There was no significant difference in any indicators under SEF exposure of 35 kV/m for 7d, 14d and 21d between experimental group and control group. Under the PFEF exposure of 35 kV/m, white blood cell count significantly reduced after exposure of 7d, 14d and 21d. Meanwhile, red blood cell count significantly reduced after exposure of 7d, and returned to normal level through the compensatory response of organism after exposure of 14d and 21d. Hemoglobin concentration significantly decreased only after exposure of 21d. Based on tested results of hematological indicators, SEF exposure of 35 kV/m did not affect immune functions in mice but PFEF exposure of 35 kV/m could cause a decline of immune function. This difference of effects from SEF and PFEF on immune function was possibly caused by the difference of the degree of molecular polarization and ion migration in organism under exposure of two kinds of electric fields.
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Key Words
- AC, alternating current
- BAS%, proportion of basophil
- CG, control group
- DC, direct current
- EG, experimental group
- EO%, proportion of eosinophil
- HGB, hemoglobin concentration
- ICNIRP, the International Commission on Non-Ionizing Radiation Protection
- ICR, Institute of Cancer Research
- IEEE, the Institute of Electrical and Electronics Engineers
- Immune function
- LYM%, proportion of lymphocyte
- MO%, proportion of monocyte
- Mean±SD, mean value ± standard deviation
- NE%, proportion of neutrophil
- PFEF, power frequency electric field
- Power frequency electric field
- RBC, red blood cell count
- SEF, static electric field
- Static electric field
- UHV, ultra high voltage
- Ultra-high-voltage transmission
- WBC, white blood cell count
- White blood cell
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Affiliation(s)
- Guoqing Di
- Institute of Environmental Process, College of Environmental and Resource Sciences, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou 310058, PR China.
| | - Xiaoyu Gu
- Institute of Environmental Process, College of Environmental and Resource Sciences, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou 310058, PR China
| | - Qinhao Lin
- Institute of Environmental Process, College of Environmental and Resource Sciences, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou 310058, PR China
| | - Sixia Wu
- Institute of Environmental Process, College of Environmental and Resource Sciences, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou 310058, PR China
| | - Hak Bong Kim
- Institute of Environmental Process, College of Environmental and Resource Sciences, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou 310058, PR China
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Milakara D, Grozea C, Dahlem M, Major S, Winkler MKL, Lückl J, Scheel M, Kola V, Schoknecht K, Lublinsky S, Friedman A, Martus P, Hartings JA, Woitzik J, Dreier JP. Simulation of spreading depolarization trajectories in cerebral cortex: Correlation of velocity and susceptibility in patients with aneurysmal subarachnoid hemorrhage. Neuroimage Clin 2017; 16:524-38. [PMID: 28948141 DOI: 10.1016/j.nicl.2017.09.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2017] [Revised: 08/23/2017] [Accepted: 09/05/2017] [Indexed: 11/23/2022]
Abstract
In many cerebral grey matter structures including the neocortex, spreading depolarization (SD) is the principal mechanism of the near-complete breakdown of the transcellular ion gradients with abrupt water influx into neurons. Accordingly, SDs are abundantly recorded in patients with traumatic brain injury, spontaneous intracerebral hemorrhage, aneurysmal subarachnoid hemorrhage (aSAH) and malignant hemispheric stroke using subdural electrode strips. SD is observed as a large slow potential change, spreading in the cortex at velocities between 2 and 9 mm/min. Velocity and SD susceptibility typically correlate positively in various animal models. In patients monitored in neurocritical care, the Co-Operative Studies on Brain Injury Depolarizations (COSBID) recommends several variables to quantify SD occurrence and susceptibility, although accurate measures of SD velocity have not been possible. Therefore, we developed an algorithm to estimate SD velocities based on reconstructing SD trajectories of the wave-front's curvature center from magnetic resonance imaging scans and time-of-SD-arrival-differences between subdural electrode pairs. We then correlated variables indicating SD susceptibility with algorithm-estimated SD velocities in twelve aSAH patients. Highly significant correlations supported the algorithm's validity. The trajectory search failed significantly more often for SDs recorded directly over emerging focal brain lesions suggesting in humans similar to animals that the complexity of SD propagation paths increase in tissue undergoing injury. An algorithm has been developed to estimate spreading depolarization (SD) velocities in neurocritical care. The algorithm is based on reconstructing SD trajectories of the wave-front's curvature center. It utilizes MRI scans and time-of-SD-arrival-differences between subdural electrode pairs. Variables indicating SD susceptibility correlated with algorithm-estimated SD velocities. The findings establish the opportunity to exploit the SD velocity as part of the multimodal assessment in neurocritical care.
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Key Words
- 3D, three dimensional
- AC, alternating current
- ADC, apparent diffusion coefficient
- COSBID, Co-Operative Studies on Brain Injury Depolarizations
- CT, computed tomography
- Cytotoxic edema
- DC, direct current
- DWI, diffusion-weighted imaging
- E, electrode
- ECoG, electrocorticography
- FLAIR, fluid-attenuated inversion recovery
- HU, Hounsfield units
- ICH, intracerebral hemorrhage
- IOS, intrinsic optical signal
- Ischemia
- MCA, middle cerebral artery
- MHS, malignant hemispheric stroke
- MPRAGE, magnetization prepared rapid gradient echo
- MRI, magnetic resonance imaging
- NO, nitric oxide
- PTDDD, peak total SD-induced depression duration of a recording day
- R_diff, radius difference
- SAH, subarachnoid hemorrhage
- SD, spreading depolarization
- SPC, slow potential change
- Spreading depression
- Stroke
- Subarachnoid hemorrhage
- TBI, traumatic brain injury
- TOAD, time-of-SD-arrival-difference
- Traumatic brain injury
- V_diff, velocity difference
- WFNS, World Federation of Neurosurgical Societies
- aSAH, aneurysmal subarachnoid hemorrhage
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Yamashita M. Weak electric fields serve as guidance cues that direct retinal ganglion cell axons in vitro. Biochem Biophys Rep 2015; 4:83-88. [PMID: 29124190 PMCID: PMC5668898 DOI: 10.1016/j.bbrep.2015.08.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 08/17/2015] [Accepted: 08/28/2015] [Indexed: 11/28/2022] Open
Abstract
Growing axons are directed by an extracellular electric field in a process known as galvanotropism. The electric field is a predominant guidance cue directing retinal ganglion cell (RGC) axons to the future optic disc during embryonic development. Specifically, the axons of newborn RGCs grow along the extracellular voltage gradient that exists endogenously in the embryonic retina (Yamashita, 2013 [8]). To investigate the molecular mechanisms underlying galvanotropic behaviour, the quantification of the electric effect on axon orientation must be examined. In the present study, a culture system was built to apply a constant, uniform direct current (DC) electric field by supplying an electrical current to the culture medium, and this system also continuously recorded the voltage difference between the two points in the medium. A negative feedback circuit was designed to regulate the supplied current to maintain the voltage difference at the desired value. A chick embryo retinal strip was placed between the two points and cultured for 24 h in an electric field in the opposite direction to the endogenous field, and growing axons were fluorescently labelled for live cell imaging (calcein-AM). The strength of the exogenous field varied from 0.0005 mV/mm to 10.0 mV/mm. The results showed that RGC axons grew in the reverse direction towards the cathode at voltage gradients of ≥0.0005 mV/mm, and straightforward extensions were found in fields of ≥0.2–0.5 mV/mm, which were far weaker than the endogenous voltage gradient (15 mV/mm). These findings suggest that the endogenous electric field is sufficient to guide RGC axons in vivo. Retinal ganglion cell axons grow along an extracellular electric field. A culture system was built to apply a constant, uniform DC electric field. Weak electric fields (≥ 0.0005 mV/mm) were effective for the cathodal orientation. The endogenous field (15 mV/mm) is sufficient for the correct guidance of axons.
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Affiliation(s)
- Masayuki Yamashita
- Center for Medical Science, International University of Health and Welfare, 2600-1 Kitakanemaru, Ohtawara 324-8501, Japan
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Stern S, Segal M, Moses E. Involvement of Potassium and Cation Channels in Hippocampal Abnormalities of Embryonic Ts65Dn and Tc1 Trisomic Mice. EBioMedicine 2015; 2:1048-62. [PMID: 26501103 DOI: 10.1016/j.ebiom.2015.07.038] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Revised: 07/24/2015] [Accepted: 07/28/2015] [Indexed: 01/09/2023] Open
Abstract
Down syndrome (DS) mouse models exhibit cognitive deficits, and are used for studying the neuronal basis of DS pathology. To understand the differences in the physiology of DS model neurons, we used dissociated neuronal cultures from the hippocampi of Ts65Dn and Tc1 DS mice. Imaging of [Ca2+]i and whole cell patch clamp recordings were used to analyze network activity and single neuron properties, respectively. We found a decrease of ~ 30% in both fast (A-type) and slow (delayed rectifier) outward potassium currents. Depolarization of Ts65Dn and Tc1 cells produced fewer spikes than diploid cells. Their network bursts were smaller and slower than diploids, displaying a 40% reduction in Δf / f0 of the calcium signals, and a 30% reduction in propagation velocity. Additionally, Ts65Dn and Tc1 neurons exhibited changes in the action potential shape compared to diploid neurons, with an increase in the amplitude of the action potential, a lower threshold for spiking, and a sharp decrease of about 65% in the after-hyperpolarization amplitude. Numerical simulations reproduced the DS measured phenotype by variations in the conductance of the delayed rectifier and A-type, but necessitated also changes in inward rectifying and M-type potassium channels and in the hyperpolarization-activated cyclic nucleotide-gated (HCN) channels. We therefore conducted whole cell patch clamp measurements of M-type potassium currents, which showed a ~ 90% decrease in Ts65Dn neurons, while HCN measurements displayed an increase of ~ 65% in Ts65Dn cells. Quantitative real-time PCR analysis indicates overexpression of 40% of KCNJ15, an inward rectifying potassium channel, contributing to the increased inhibition. We thus find that changes in several types of potassium channels dominate the observed DS model phenotype. Down syndrome model neurons display altered action potential shape, are less excitable and have decreased potassium currents. The data is accurately described by a numerical simulation that changes conductance of four potassium and the HCN currents. Measurements of the currents related to these four channels, and RT-pcr for a fifth (KCNJ15), confirm the numerical model.
In Down syndrome (DS) cognitive function is impaired, leading us to use cultured hippocampal neuronal networks to investigate the cellular basis of its pathology. DS mouse model neurons are less excitable, produce fewer spikes and generate less network activity. Alterations in several types of potassium currents were detected in these neurons. Numerical simulation of a DS neuron successfully reproduced the experimental results. Beyond extending our understanding of neuronal function and pathology, the alterations in channel conductance can now be targeted with specific drugs so as to point to new directions in therapy of cognitive disabilities of DS.
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Key Words
- 1D, one-dimensional
- 2D, two-dimensional
- DC, direct current
- DS, Down syndrome
- Down syndrome
- EPSC, excitatory post synaptic current
- GABA, gamma-aminobutyric acid
- GIRK, G protein-coupled inwardly-rectifying potassium channels
- HCN, hyperpolarization-activated cyclic nucleotide-gated
- Hippocampus
- Inward rectifiers
- Potassium channels
- Potassium currents
- ROI, region of interest
- RT-PCR, real time polymerase chain reaction
- Reduced excitability
- SEM, standard error of mean
- TTX, tetrodotoxin
- Tc1
- Ts65Dn
- WT, wild type
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Affiliation(s)
| | | | | | - Andreas Pflaumer
- Address reprint requests and correspondence: Dr. Andreas Pflaumer, Department of Paediatric Cardiology, Royal Children’s Hospital, 50 Flemington Road, Parkville, Melbourne, Victoria 3052, Australia
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