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Xu X, Chen M, Chen T, Ni X, Fang Z, Fang Y, Zhang L, Zhang X, Huang J. Ultra-high static magnetic field induces a change in the spectrum but not frequency of DNA spontaneous mutations in Arabidopsis thaliana. FRONTIERS IN PLANT SCIENCE 2023; 14:1305069. [PMID: 38126008 PMCID: PMC10731980 DOI: 10.3389/fpls.2023.1305069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Accepted: 11/20/2023] [Indexed: 12/23/2023]
Abstract
Biological effects of magnetic fields have been extensively studied in plants, microorganisms and animals, and applications of magnetic fields in regulation of plant growth and phytoprotection is a promising field in sustainable agriculture. However, the effect of magnetic fields especially ultra-high static magnetic field (UHSMF) on genomic stability is largely unclear. Here, we investigated the mutagenicity of 24.5, 30.5 and 33.0 T UHSMFs with the gradient of 150, 95 and 0 T/m, respectively, via whole genome sequencing. Our results showed that 1 h exposure of Arabidopsis dried seeds to UHSMFs has no significant effect on the average rate of DNA mutations including single nucleotide variations and InDels (insertions and deletions) in comparison with the control, but 33.0 T and 24.5 T treatments lead to a significant change in the rate of nucleotide transitions and InDels longer than 3 bp, respectively, suggesting that both strength and gradient of UHSMF impact molecular spectrum of DNA mutations. We also found that the decreased transition rate in UHSMF groups is correlated with the upstream flanking sequences of G and C mutation sites. Furthermore, the germination rate of seeds exposed to 24.5 T SMF with -150 T/m gradient showed a significant decrease at 24 hours after sowing. Overall, our data lay a basis for precisely assessing the potential risk of UHSMF on DNA stability, and for elucidating molecular mechanism underlying gradient SMF-regulated biological processes in the future.
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Affiliation(s)
- Xiang Xu
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai, China
| | - Mengjiao Chen
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai, China
| | - Tianli Chen
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai, China
| | - Xinda Ni
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai, China
| | - Zhicai Fang
- Heye Health Industrial Research Institute of Heye Health Technology Co., Ltd., Huzhou, China
| | - Yanwen Fang
- Heye Health Industrial Research Institute of Heye Health Technology Co., Ltd., Huzhou, China
| | - Lei Zhang
- High Magnetic Field Laboratory, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Xin Zhang
- High Magnetic Field Laboratory, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Jirong Huang
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai, China
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2
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Zhang G, Liu X, Liu Y, Zhang S, Yu T, Chai X, He J, Yin D, Zhang C. The effect of magnetic fields on tumor occurrence and progression: Recent advances. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2023; 179:38-50. [PMID: 37019340 DOI: 10.1016/j.pbiomolbio.2023.04.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 03/14/2023] [Accepted: 04/01/2023] [Indexed: 04/05/2023]
Abstract
Malignancies are the leading human health threat worldwide. Despite rapidly developing treatments, poor prognosis and outcome are still common. Magnetic fields have shown good anti-tumoral effects both in vitro and in vivo, and represent a potential non-invasive treatment; however, the specific underlying molecular mechanisms remain unclear. We here review recent studies on magnetic fields and their effect on tumors at three different levels: organismal, cellular, and molecular. At the organismal level, magnetic fields suppress tumor angiogenesis, microcirculation, and enhance the immune response. At the cellular level, magnetic fields affect tumor cell growth and biological functions by affecting cell morphology, cell membrane structure, cell cycle, and mitochondrial function. At the molecular level, magnetic fields suppress tumors by interfering with DNA synthesis, reactive oxygen species level, second messenger molecule delivery, and orientation of epidermal growth factor receptors. At present, scientific experimental evidence is still lacking; therefore, systematic studies on the biological mechanisms involved are urgently needed for the future application of magnetic fields to tumor treatment.
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3
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Yachi Y, Kai T, Matsuya Y, Hirata Y, Yoshii Y, Date H. Impact of the Lorentz force on electron track structure and early DNA damage yields in magnetic resonance-guided radiotherapy. Sci Rep 2022; 12:16412. [PMID: 36180476 PMCID: PMC9525613 DOI: 10.1038/s41598-022-18138-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 08/05/2022] [Indexed: 11/13/2022] Open
Abstract
Magnetic resonance-guided radiotherapy (MRgRT) has been developed and installed in recent decades for external radiotherapy in several clinical facilities. Lorentz forces modulate dose distribution by charged particles in MRgRT; however, the impact of Lorentz forces on low-energy electron track structure and early DNA damage induction remain unclear. In this study, we estimated features of electron track structure and biological effects in a static magnetic field (SMF) using a general-purpose Monte Carlo code, particle and heavy ion transport code system (PHITS) that enables us to simulate low-energy electrons down to 1 meV by track-structure mode. The macroscopic dose distributions by electrons above approximately 300 keV initial energy in liquid water are changed by both perpendicular and parallel SMFs against the incident direction, indicating that the Lorentz force plays an important role in calculating dose within tumours. Meanwhile, DNA damage estimation based on the spatial patterns of atomic interactions indicates that the initial yield of DNA double-strand breaks (DSBs) is independent of the SMF intensity. The DSB induction is predominantly attributed to the secondary electrons below a few tens of eV, of which energy deposition patterns are not considerably affected by the Lorentz force. Our simulation study suggests that treatment planning for MRgRT can be made with consideration of only changed dose distribution.
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Affiliation(s)
- Yoshie Yachi
- grid.39158.360000 0001 2173 7691Graduate School of Health Sciences, Hokkaido University, Kita-12 Nishi-5, Kita-ku, Sapporo, Hokkaido 060-0812 Japan
| | - Takeshi Kai
- grid.20256.330000 0001 0372 1485Nuclear Science and Engineering Centre, Research Group for Radiation Transport Analysis, Japan Atomic Energy Agency (JAEA), 2-4 Shirakata, Tokai, Ibaraki 319-1195 Japan
| | - Yusuke Matsuya
- Nuclear Science and Engineering Centre, Research Group for Radiation Transport Analysis, Japan Atomic Energy Agency (JAEA), 2-4 Shirakata, Tokai, Ibaraki, 319-1195, Japan. .,Faculty of Health Sciences, Hokkaido University, Kita-12 Nishi-5, Kita-ku, Sapporo, Hokkaido, 060-0812, Japan.
| | - Yuho Hirata
- grid.20256.330000 0001 0372 1485Nuclear Science and Engineering Centre, Research Group for Radiation Transport Analysis, Japan Atomic Energy Agency (JAEA), 2-4 Shirakata, Tokai, Ibaraki 319-1195 Japan
| | - Yuji Yoshii
- grid.39158.360000 0001 2173 7691Central Institute of Isotope Science, Hokkaido University, Kita-15 Nishi-7, Kita-ku, Sapporo, Hokkaido 060-0815 Japan ,grid.39158.360000 0001 2173 7691Faculty of Health Sciences, Hokkaido University, Kita-12 Nishi-5, Kita-ku, Sapporo, Hokkaido 060-0812 Japan
| | - Hiroyuki Date
- grid.39158.360000 0001 2173 7691Faculty of Health Sciences, Hokkaido University, Kita-12 Nishi-5, Kita-ku, Sapporo, Hokkaido 060-0812 Japan
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Martínez M, Úbeda A, Martínez‑Botas J, Trillo M. Field exposure to 50 Hz significantly affects wild‑type and unfolded p53 expression in NB69 neuroblastoma cells. Oncol Lett 2022; 24:295. [PMID: 35949615 PMCID: PMC9353226 DOI: 10.3892/ol.2022.13415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 06/17/2022] [Indexed: 11/26/2022] Open
Abstract
Previous studies have shown that intermittent exposure to a 50 Hz, 100 µT sinusoidal magnetic field (MF) promotes proliferation of human neuroblastoma cells, NB69. This effect is mediated by activation of the epidermal growth factor receptor through a free radical-dependent activation of the p38 pathway. The present study investigated the possibility that the oxidative stress-sensitive protein p53 is a potential target of the MF, and that field exposure can affect the protein expression. To that end, NB69 cells were exposed to short intervals of 30 to 120 min to the aforementioned MF parameters. Two specific anti-p53 antibodies that allow discrimination between the wild and unfolded forms of p53 were used to study the expression and cellular distribution of both isoforms of the protein. The expression of the antiapoptotic protein Bcl-2, whose regulation is mediated by p53, was also analyzed. The obtained results revealed that MF exposure induced increases in p53 gene expression and in protein expression of the wild-type form of p53. Field exposure also caused overexpression of the unfolded form of p53, together with changes in the nuclear/cytoplasmic distribution of both forms of the protein. The expression of protein Bcl-2 was also significantly increased in response to the MF. As a whole, these results indicated that the MF is capable of interacting with the function, distribution and conformation of protein p53. Such interactions could be involved in previously reported MF effects on NB69 proliferation promotion.
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Affiliation(s)
- María Martínez
- Bioelectromagnetics Service, Department of Research, Ramón y Cajal University Hospital, Ramón Y Cajal Institute of Health Research, 28034 Madrid
| | - Alejandro Úbeda
- Bioelectromagnetics Service, Department of Research, Ramón y Cajal University Hospital, Ramón Y Cajal Institute of Health Research, 28034 Madrid
| | - Javier Martínez‑Botas
- Biochemistry Service, Department of Research, Ramón y Cajal University Hospital, Ramón Y Cajal Institute of Health Research, 28034 Madrid, Spain
| | - María Trillo
- Bioelectromagnetics Service, Department of Research, Ramón y Cajal University Hospital, Ramón Y Cajal Institute of Health Research, 28034 Madrid
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Gerdesmeyer L, Zielhardt P, Klüter T, Gollwitzer H, Gerdesmeyer L, Hausdorf J, Ringeisen M, Knobloch K, Saxena A, Krath A. Stimulation of human bone marrow mesenchymal stem cells by electromagnetic transduction therapy - EMTT. Electromagn Biol Med 2022; 41:304-314. [DOI: 10.1080/15368378.2022.2079672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Ludger Gerdesmeyer
- Department of Sports Medicine, Palo Alto Medical Center, Palo Alto, USA
- Department of Orthopedic and Traumatology, Technical University Munich, Munich Germany
- Städtisches Krankenhaus Kiel, Kiel
| | - Paula Zielhardt
- Department of Orthopaedic Surgery and Traumatology, University Schleswig Holstein, Kiel, Germany
| | - Tim Klüter
- Department of Orthopaedic Surgery and Traumatology, University Schleswig Holstein, Kiel, Germany
| | - Hans Gollwitzer
- Department of Orthopedic and Traumatology, Technical University Munich, Munich Germany
| | - Lennart Gerdesmeyer
- Department of Orthopedic and Traumatology, Technical University Munich, Munich Germany
| | - Joerg Hausdorf
- Orthopedic Department, Physical Medicine and Rehabilitation, University Hospital of Munich, Germany
| | - Martin Ringeisen
- Department of Orthopedic Surgery and Traumatology, Orthopaedic Medical Center Dr. Ringeisen, Augsburg, Germany
| | - Karsten Knobloch
- Orthopedic Department, SportPraxis Prof. Dr. med. Karsten Knobloch, Hannover
| | - Amol Saxena
- Department of Sports Medicine, Palo Alto Medical Center, Palo Alto, USA
| | - André Krath
- Department of Orthopaedic Surgery and Traumatology, University Schleswig Holstein, Kiel, Germany
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6
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12 T high static magnetic field suppresses osteosarcoma cells proliferation by regulating intracellular ROS and iron status. Exp Cell Res 2022; 417:113223. [DOI: 10.1016/j.yexcr.2022.113223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2022] [Revised: 05/17/2022] [Accepted: 05/22/2022] [Indexed: 11/24/2022]
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7
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Song C, Yu B, Wang J, Zhu Y, Zhang X. Effects of Moderate to High Static Magnetic Fields on Reproduction. Bioelectromagnetics 2022; 43:278-291. [PMID: 35485707 DOI: 10.1002/bem.22404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Revised: 03/09/2022] [Accepted: 04/09/2022] [Indexed: 11/08/2022]
Abstract
With the wide application of magnetic resonance imaging in hospitals and permanent magnets in household items, people have increased exposure to various types of static magnetic fields (SMFs) with moderate and high intensities, which has caused a considerable amount of public concern. Studies have shown that some aspects of gametogenesis and early embryonic development can be significantly affected by SMFs, while others have shown no effects. This review summarizes the experimental results of moderate to high-intensity SMFs (1 mT-16.7 T) on the reproductive development of different model animals, and we find that the effects of SMFs are variable depending on experimental conditions. In general, the effects of inhomogeneous SMFs seem to be more significant compared to that of homogeneous SMFs, which is likely due to magnetic forces generated by the magnetic field gradient. Moreover, some electromagnetic fields may have induced bioeffects because of nonnegligible gradient and heat effect, which are much reduced in superconducting magnets. We hope this review can provide a starting point for more in-depth analysis of various SMFs on reproduction, which is indispensable for evaluating the safety and potential applications of SMFs on living organisms in the future. © 2022 Bioelectromagnetics Society.
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Affiliation(s)
- Chao Song
- High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China.,University of Science and Technology of China, Hefei, China
| | - Biao Yu
- High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China.,University of Science and Technology of China, Hefei, China
| | - Junjun Wang
- High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Yiming Zhu
- High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China.,Institutes of Physical Science and Information Technology, Anhui University, Hefei, China
| | - Xin Zhang
- High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China.,University of Science and Technology of China, Hefei, China.,Institutes of Physical Science and Information Technology, Anhui University, Hefei, China.,International Magnetobiology Frontier Research Center (iMFRC), Science Island, Hefei, China
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8
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Rekena A, Livkisa D, Kamolins E, Vanags J, Loca D. Biopharmaceutical-Type Chinese Hamster Ovary Cell Cultivation Under Static Magnetic Field Exposure: A Study of Genotoxic Effect. Front Bioeng Biotechnol 2021; 9:751538. [PMID: 34900956 PMCID: PMC8656418 DOI: 10.3389/fbioe.2021.751538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Accepted: 10/28/2021] [Indexed: 12/04/2022] Open
Abstract
The lack of a sufficient research base is the reason for the ongoing discussion regarding the genotoxic effect of magnetic field (MF) exposure on mammalian cell cultures. Chinese hamster ovary (CHO) suspension-type cells, which are widely used for biopharmaceutical production, are potentially subjected to an increased MF when cultivated in bioreactors equipped with bottom-placed magnetically coupled stirring mechanisms. The main challenge for conducting research in this field remains the availability of a suitable experimental setup that generates an appropriate MF for the raised research question. In the present study, a simple and cost-effective experimental setup was developed that generated a static MF, similar to what has been modeled in large-scale bioreactors and, at the same time, was suitable for experimental cell cultivation in laboratory conditions. The measured maximum magnetic flux density to which the cells were exposed was 0.66 T. To assess the possible genotoxic effect, cells were continuously subcultivated in laboratory petri dishes for a period of 14 days, corresponding to a typical duration of a biopharmaceutical production process in a conventional fed-batch regime. The genotoxic effect was assessed using the cytokinesis-block micronucleus assay with fluorescent staining. Results showed that a 0.66-T static MF exposure had no significant long-term effect on cell viability and chromosomal damage but demonstrated a short-term effect on cell apoptosis. Significant increase in nuclear bud formation was observed. These findings may encourage other researchers in future studies investigating cellular responses to MF exposure and contribute relevant data for comparison.
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Affiliation(s)
- Alina Rekena
- Rudolfs Cimdins Riga Biomaterials Innovations and Development Centre of RTU, Faculty of Materials Science and Applied Chemistry, Institute of General Chemical Engineering, Riga Technical University, Riga, Latvia
| | - Dora Livkisa
- Department of Microbiology and Biotechnology, Faculty of Biology, University of Latvia, Riga, Latvia
| | - Edmunds Kamolins
- Institute of Physical Energetics, Riga, Latvia.,Institute of Industrial Electronics and Electrical Engineering, Riga Technical University, Riga, Latvia
| | - Juris Vanags
- Bioengineering Laboratory, Latvian State Institute of Wood Chemistry, Riga, Latvia
| | - Dagnija Loca
- Rudolfs Cimdins Riga Biomaterials Innovations and Development Centre of RTU, Faculty of Materials Science and Applied Chemistry, Institute of General Chemical Engineering, Riga Technical University, Riga, Latvia.,Baltic Biomaterials Centre of Excellence, Headquarters at Riga Technical University, Riga, Latvia
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9
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Parfenov VA, Mironov VA, van Kampen KA, Karalkin PA, Koudan EV, Pereira FDAS, Petrov SV, Nezhurina EK, Petrov OF, Myasnikov MI, Walboomers FX, Engelkamp H, Christianen P, Khesuani YD, Moroni L, Mota C. Scaffold-free and label-free biofabrication technology using levitational assembly in a high magnetic field. Biofabrication 2020; 12:045022. [PMID: 32050181 DOI: 10.1088/1758-5090/ab7554] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The feasibility of magnetic levitational bioassembly of tissue-engineered constructs from living tissue spheroids in the presence of paramagnetic ions (i.e. Gd3+) was recently demonstrated. However, Gd3+ is relatively toxic at concentrations above 50 mM normally used to enable magnetic levitation with NdFeB-permanent magnets. Using a high magnetic field (a 50 mm-bore, 31 T Bitter magnet) at the High Field Magnet Laboratory at Radboud University in Nijmegen, The Netherlands, we performed magnetic levitational assembly of tissue constructs from living spheroids prepared from the SW1353 chondrosarcoma cell line at 0.8 mM Gd3+ containing salt gadobutrol at 19 T magnetic field. The parameters of the levitation process were determined on the basis of polystyrene beads with a 170 μm-diameter. To predict the theoretical possibility of assembly, a zone of stable levitation in the horizontal and vertical areas of cross sections was previously calculated. The construct from tissue spheroids partially fused after 3 h in levitation. The analysis of viability after prolonged exposure (1 h) to strong magnetic fields (up to 30 T) showed the absence of significant cytotoxicity or morphology changes in the tissue spheroids. A high magnetic field works as a temporal and removal support or so-called 'scaffield'. Thus, formative biofabrication of tissue-engineered constructs from tissue spheroids in the high magnetic field is a promising research direction.
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Affiliation(s)
- Vladislav A Parfenov
- Laboratory for Biotechnological Research '3D Bioprinting Solutions', Moscow, Russia
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10
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Rekena A, Didrihsone E, Vegere K. The role of magnetic field in the biopharmaceutical production: Current perspectives. BIOTECHNOLOGY REPORTS (AMSTERDAM, NETHERLANDS) 2019; 22:e00334. [PMID: 31011551 PMCID: PMC6460295 DOI: 10.1016/j.btre.2019.e00334] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 03/19/2019] [Accepted: 03/28/2019] [Indexed: 01/02/2023]
Abstract
Current scientific evidence on the influence of magnetic field on mammalian cell lines used for industrial production of biopharmaceuticals, on human cell lines and on potential cell lines for the biopharmaceutical production is presented in this review. A novel magnetic coupling induced agitation could be the best solution to eliminate sources of contamination in stirred tank bioreactors which is especially important for mammalian cell cultures. Nevertheless, the side effect of magnetically-coupled stirring mechanism is that cells are exposed to the generated magnetic field. The influence of magnetic field on biological systems has been investigated for several decades. The research continues nowadays as well, investigating the influence of various types of magnetic field in a variety of experimental setups. In the context of bioreactors, only the lower frequencies and intensities of the magnetic field are relevant.
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Affiliation(s)
- Alina Rekena
- Rudolfs Cimdins Riga Biomaterials Innovations and Development Centre of RTU, Institute of General Chemical Engineering, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Pulka 3, Riga, LV1007, Latvia
| | - Elina Didrihsone
- Bioengineering Laboratory, Latvian State Institute of Wood Chemistry, Dzerbenes 27, Riga, LV1006, Latvia
- Institute of Polymer Materials, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Paula Valdena 3, Riga, LV-1048, Latvia
| | - Kristine Vegere
- Rudolfs Cimdins Riga Biomaterials Innovations and Development Centre of RTU, Institute of General Chemical Engineering, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Pulka 3, Riga, LV1007, Latvia
- Water Research Laboratory, Faculty of Civil Engineering, Riga Technical University, Paula Valdena 1-205, Riga, LV1048, Latvia
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11
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Tian X, Wang D, Feng S, Zhang L, Ji X, Wang Z, Lu Q, Xi C, Pi L, Zhang X. Effects of 3.5-23.0 T static magnetic fields on mice: A safety study. Neuroimage 2019; 199:273-280. [PMID: 31158482 DOI: 10.1016/j.neuroimage.2019.05.070] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2019] [Revised: 05/03/2019] [Accepted: 05/27/2019] [Indexed: 12/19/2022] Open
Abstract
People are exposed to various magnetic fields, including the high static/steady magnetic field (SMF) of MRI, which has been increased to 9.4 T in preclinical investigations. However, relevant safety studies about high SMF are deficient. Here we examined whether 3.5-23.0 T SMF exposure for 2 h has severe long-term effects on mice using 112 C57BL/6J mice. The food/water consumption, blood glucose levels, blood routine, blood biochemistry, as well as organ weight and HE stains were all examined. The food consumption and body weight were slightly decreased for 23.0 T-exposed mice (14.6%, P < 0.01, and 1.75-5.57%, P < 0.05, respectively), but not the other groups. While total bilirubin (TBIL), white blood cells, platelet and lymphocyte numbers were affected by some magnetic conditions, most of them were still within normal reference range. Although 13.5 T magnetic fields with the highest gradient (117.2 T/m) caused spleen weight increase, the blood count and biochemistry results were still within the control reference range. Moreover, the highest field 23.0 T with no gradient did not cause organ weight or blood biochemistry abnormality, which indicates that field gradient is a key parameter. Collectively, these data suggest 3.5-23.0 T static magnetic field exposure for 2 h do not have severe long-term effects on mice.
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Affiliation(s)
- Xiaofei Tian
- High Magnetic Field Laboratory, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, PR China; Institutes of Physical Science and Information Technology, Anhui University, Hefei, Anhui, 230601, PR China
| | - Dongmei Wang
- High Magnetic Field Laboratory, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, PR China; Science Island Branch of Graduate School, University of Science and Technology of China, Hefei, Anhui, 230026, PR China
| | - Shuang Feng
- High Magnetic Field Laboratory, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, PR China; Science Island Branch of Graduate School, University of Science and Technology of China, Hefei, Anhui, 230026, PR China
| | - Lei Zhang
- High Magnetic Field Laboratory, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, PR China
| | - Xinmiao Ji
- High Magnetic Field Laboratory, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, PR China
| | - Ze Wang
- High Magnetic Field Laboratory, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, PR China; Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026, PR China
| | - Qingyou Lu
- High Magnetic Field Laboratory, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, PR China; Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026, PR China; Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, Hefei, Anhui, 230031, PR China
| | - Chuanying Xi
- High Magnetic Field Laboratory, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, PR China
| | - Li Pi
- High Magnetic Field Laboratory, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, PR China
| | - Xin Zhang
- High Magnetic Field Laboratory, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, PR China; Institutes of Physical Science and Information Technology, Anhui University, Hefei, Anhui, 230601, PR China; Science Island Branch of Graduate School, University of Science and Technology of China, Hefei, Anhui, 230026, PR China.
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12
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Inaniwa T, Suzuki M, Sato S, Noda A, Iwata Y, Kanematsu N, Shirai T, Noda K. Enhancement of biological effectiveness of carbon-ion beams by applying a longitudinal magnetic field. Int J Radiat Biol 2019; 95:720-724. [DOI: 10.1080/09553002.2019.1569774] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Taku Inaniwa
- Department of Accelerator and Medical Physics, National Institute of Radiological Sciences, Chiba, Japan
| | - Masao Suzuki
- Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Chiba, Japan
| | - Shinji Sato
- Department of Accelerator and Medical Physics, National Institute of Radiological Sciences, Chiba, Japan
| | - Akira Noda
- Department of Accelerator and Medical Physics, National Institute of Radiological Sciences, Chiba, Japan
| | - Yoshiyuki Iwata
- Department of Accelerator and Medical Physics, National Institute of Radiological Sciences, Chiba, Japan
| | - Nobuyuki Kanematsu
- Medical Physics Section, National Institute of Radiological Sciences, Chiba, Japan
| | - Toshiyuki Shirai
- Department of Accelerator and Medical Physics, National Institute of Radiological Sciences, Chiba, Japan
| | - Koji Noda
- National Institute of Radiological Sciences, Chiba, Japan
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13
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Diab KA. The Impact of the Low Frequency of the Electromagnetic Field on Human. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1237:135-149. [PMID: 31376139 DOI: 10.1007/5584_2019_420] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Recently, there has been attention and controversial debate topic about the effect of low-frequency electromagnetic fields (EMFs) on human beings. The catalyst for public awareness initiated from the first epidemiological study in 1979 that reported an association between residential EMFs exposure and the incidence of childhood leukemia. For over 40 years, many epidemiological and laboratory investigations were conducted to identify the possible biological effects of low-frequency EMF. Several studies conducted at frequencies 50/60 Hz, which related to generating of electricity from electrical appliances. Experimental studies on low-frequency EMF have provided conflicting data under specific "in vivo" and "in vitro" environments. Some original papers have reported the damaging effect on DNA molecule in EMF-exposed cells. Other studies have suggested no such damage in EMF-exposed cells. Also, the conclusions from other studies were inconclusive. These conflicting findings may attribute to the differences in the apparatus used to generate electromagnetic fields, experimental design, exposure time, genetic endpoints, and biological materials such as cell lines and animal species, strain, and age. As DNA damage is frequently a prerequisite for cancer disease, this review provided an experimental body of evidence on the effect of EMF on genetic material.
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Affiliation(s)
- Kawthar A Diab
- Genetics and Cytology Department, Genetic Engineering and Biotechnology Division, National Research Centre (NRC), Cairo, Egypt.
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14
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Mohajer JK, Nisbet A, Velliou E, Ajaz M, Schettino G. Biological effects of static magnetic field exposure in the context of MR-guided radiotherapy. Br J Radiol 2018; 92:20180484. [PMID: 30359096 DOI: 10.1259/bjr.20180484] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The clinical introduction of MRI-guided radiotherapy has prompted consideration of the potential impact of the static magnetic field on biological responses to radiation. This review provides an introduction to the mechanisms of biological interaction of radiation and magnetic fields individually, in addition to a description of the magnetic field effects on megavoltage photon beams at the macroscale, microscale and nanoscale arising from the Lorentz force on secondary charged particles. A relatively small number of scientific studies have measured the impact of combined static magnetic fields and ionising radiation on biological endpoints of relevance to radiotherapy. Approximately, half of these investigations found that static magnetic fields in combination with ionising radiation produced a significantly different outcome compared with ionising radiation alone. strength static magnetic fields appear to modestly influence the radiation response via a mechanism distinct from modification to the dose distribution. This review intends to serve as a reference for future biological studies, such that understanding of static magnetic field plus ionising radiation synergism may be improved, and if necessary, accounted for in MRI-guided radiotherapy treatment planning.
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Affiliation(s)
- Jonathan Kim Mohajer
- 1 Department of Physics, University of Surrey , Guildford , UK.,2 Medical Radiation Science group, National Physical Laboratory , Teddington , UK
| | - Andrew Nisbet
- 1 Department of Physics, University of Surrey , Guildford , UK.,3 The Royal Surrey County Hospital NHS Foundation Trust , Guildford , UK
| | - Eirini Velliou
- 4 Department of Chemical and Process Engineering, Bioprocess and Biochemical Engineering group (BioProChem), University of Surrey , Guildford , UK
| | - Mazhar Ajaz
- 3 The Royal Surrey County Hospital NHS Foundation Trust , Guildford , UK.,5 Department of Microbial and Cellular Sciences, University of Surrey , Guildford , UK
| | - Giuseppe Schettino
- 1 Department of Physics, University of Surrey , Guildford , UK.,2 Medical Radiation Science group, National Physical Laboratory , Teddington , UK
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15
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Impact of Static Magnetic Field on the Antioxidant Defence System of Mice Fibroblasts. BIOMED RESEARCH INTERNATIONAL 2018; 2018:5053608. [PMID: 29789797 PMCID: PMC5896275 DOI: 10.1155/2018/5053608] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/25/2017] [Accepted: 02/25/2018] [Indexed: 12/18/2022]
Abstract
Results of research assessing the biological impact of static magnetic fields are controversial. So far, they have not provided a clear answer to their influence on cell functioning. Since the use of permanent magnets both in everyday life and in industry becomes more and more widespread, the investigations are continued in order to explain these controversies and to evaluate positive applications. The goal of current work was to assess the impact of static magnetic field of different intensities on redox homeostasis in cultures of fibroblasts. The use of permanent magnets allowed avoiding the thermal effects which are present in electromagnets. During the research we used 6 chambers, designed exclusively by us, with different values of field flux density (varying from 0.1 to 0.7 T). We have noted the decrease in the activity of superoxide dismutase (SOD) and glutathione peroxidase (GPx). The static magnetic fields did not modify the energy state of fibroblasts— adenosine triphosphate (ATP) concentration was stable, as well as the generation of malondialdehyde (MDA)—which is a marker of oxidative stress. Results of research suggest that static magnetic fields generated by permanent magnets do not cause oxidative stress in investigated fibroblasts and that they may show slight antioxidizing activity.
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16
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Zhang L, Wang J, Wang H, Wang W, Li Z, Liu J, Yang X, Ji X, Luo Y, Hu C, Hou Y, He Q, Fang J, Wang J, Liu Q, Li G, Lu Q, Zhang X. Moderate and strong static magnetic fields directly affect EGFR kinase domain orientation to inhibit cancer cell proliferation. Oncotarget 2018; 7:41527-41539. [PMID: 27223425 PMCID: PMC5173076 DOI: 10.18632/oncotarget.9479] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 04/27/2016] [Indexed: 01/23/2023] Open
Abstract
Static magnetic fields (SMFs) can affect cell proliferation in a cell-type and intensity-dependent way but the mechanism remains unclear. At the same time, although the diamagnetic anisotropy of proteins has been proposed decades ago, the behavior of isolated proteins in magnetic fields has not been directly observed. Here we show that SMFs can affect isolated proteins at the single molecular level in an intensity-dependent manner. We found that Epidermal Growth Factor Receptor (EGFR), a protein that is overexpressed and highly activated in multiple cancers, can be directly inhibited by SMFs. Using Liquid-phase Scanning Tunneling Microscopy (STM) to examine pure EGFR kinase domain proteins at the single molecule level in solution, we observed orientation changes of these proteins in response to SMFs. This may interrupt inter-molecular interactions between EGFR monomers, which are critical for their activation. In molecular dynamics (MD) simulations, 1-9T SMFs caused increased probability of EGFR in parallel with the magnetic field direction in an intensity-dependent manner. A superconducting ultrastrong 9T magnet reduced proliferation of CHO-EGFR cells (Chinese Hamster Ovary cells with EGFR overexpression) and EGFR-expressing cancer cell lines by ~35%, but minimally affected CHO cells. We predict that similar effects of magnetic fields can also be applied to some other proteins such as ion channels. Our paper will help clarify some dilemmas in this field and encourage further investigations in order to achieve a better understanding of the biological effects of SMFs.
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Affiliation(s)
- Lei Zhang
- High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jihao Wang
- High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026, China.,Hefei National Laboratory for Physical Sciences at The Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - HongLei Wang
- Laboratory of Molecular Modeling and Design, State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China
| | - Wenchao Wang
- High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Zhiyuan Li
- High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Juanjuan Liu
- High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xingxing Yang
- High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xinmiao Ji
- High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Yan Luo
- High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Chen Hu
- High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Yubin Hou
- High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Qianqian He
- High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jun Fang
- High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Junfeng Wang
- High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Qingsong Liu
- High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Guohui Li
- Laboratory of Molecular Modeling and Design, State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China
| | - Qingyou Lu
- High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026, China.,Hefei National Laboratory for Physical Sciences at The Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.,Collaborative Innovation Center of Advanced Microstructure, Nanjing University, Nanjing, Jiangsu 210093, China
| | - Xin Zhang
- High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei, Anhui 230026, China
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17
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Zhang Y, Zhang Y, Yu H, Yang Y, Li W, Qian Z. Theta-gamma coupling in hippocampus during working memory deficits induced by low frequency electromagnetic field exposure. Physiol Behav 2017; 179:135-142. [DOI: 10.1016/j.physbeh.2017.05.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2016] [Revised: 03/29/2017] [Accepted: 05/31/2017] [Indexed: 11/28/2022]
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18
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Cell type- and density-dependent effect of 1 T static magnetic field on cell proliferation. Oncotarget 2017; 8:13126-13141. [PMID: 28061454 PMCID: PMC5355082 DOI: 10.18632/oncotarget.14480] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Accepted: 12/13/2016] [Indexed: 11/29/2022] Open
Abstract
Increasing evidence shows that static magnetic fields (SMFs) can affect cell proliferation but mixed results have been reported. Here we systematically examined the effects of 1 T (Tesla) SMF, which is close to the SMF intensity that patients are exposed to MRI (magnetic resonance imaging) scanners in hospitals, for its effect on 15 different cell lines, including 12 human and 3 rodent cell lines. Our results show that 1 T SMF does not have apparent impact on cell cycle or cell death. However, at higher cell density, it reduced cell numbers in six out of seven solid human cancer cell lines. We found that both cell type and cell density had evident impacts on SMF effects. Moreover, the EGFR-Akt-mTOR pathway, which varies significantly between different cell types and densities, contributes to the differential effects of SMF. In addition, SMF also increases the efficacy of Akt inhibitors on cancer cell growth inhibition. Therefore 1 T SMF affects cell proliferation in a cell type- and cell density-dependent manner, and the inhibition effect of 1 T SMF on multiple cancer cells at higher cell density may indicate its clinical potential in late stage cancer therapy.
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19
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Meng Y, Shi C, Hu B, Gong J, Zhong X, Lin X, Zhang X, Liu J, Liu C, Xu H. External magnetic field promotes homing of magnetized stem cells following subcutaneous injection. BMC Cell Biol 2017; 18:24. [PMID: 28549413 PMCID: PMC5446710 DOI: 10.1186/s12860-017-0140-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 05/15/2017] [Indexed: 01/03/2023] Open
Abstract
Background Mesenchymal stem cells (MSCs) are multipotent stromal cells that have the ability to self-renew and migrate to sites of pathology. In vivo tracking of MSCs provides insights into both, the underlying mechanisms of MSC transformation and their potential as gene delivery vehicles. The aim of our study was to assess the ability of superparamagnetic iron oxide nanoparticles (SPIONs)-labeled Wharton’s Jelly of the human umbilical cord-derived MSCs (WJ-MSCs) to carry the green fluorescent protein (GFP) gene to cutaneous injury sites in a murine model. Methods WJ-MSCs were isolated from a fresh umbilical cord and were genetically transformed to carry the GFP gene using lentiviral vectors with magnetically labeled SPIONs. The SPIONs/GFP-positive WJ-MSCs expressed multipotent cell markers and demonstrated the potential for osteogenic and adipogenic differentiation. Fifteen skin-injured mice were divided into three groups. Group I was treated with WJ-MSCs, group II with SPIONs/GFP-positive WJ-MSCs, and group III with SPIONs/GFP-positive WJ-MSCs exposed to an external magnetic field (EMF). Magnetic resonance imaging and optical molecular imaging were performed, and images were acquired 1, 2, and 7 days after cell injection. Results The results showed that GFP could be intensively detected around the wound in vivo 24 h after the cells were injected. Furthermore, we observed an accumulation of WJ-MSCs at the wound site, and EMF exposure increased the speed of cell transport. In conclusion, our study demonstrated that SPIONs/GFP function as cellular probes for monitoring in vivo migration and homing of WJ-MSCs. Moreover, exposure to an EMF can increase the transportation efficiency of SPIONs-labeled WJ-MSCs in vivo. Conclusions Our findings could lead to the development of a gene carrier system for the treatment of diseases. Electronic supplementary material The online version of this article (doi:10.1186/s12860-017-0140-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yu Meng
- Department of Nephrology, the First Hospital Affiliated to Jinan University, No. 613 Huangpu West Road, Guangzhou, 510630, China
| | - Changzhen Shi
- Department of Radiology, the First Hospital Affiliated to Jinan University, No. 613 Huangpu West Road, Guangzhou, 510630, China
| | - Bo Hu
- Department of Nephrology, the First Hospital Affiliated to Jinan University, No. 613 Huangpu West Road, Guangzhou, 510630, China
| | - Jian Gong
- Department of Nuclear Medicine, the First Hospital Affiliated to Jinan University, No. 613 Huangpu West Road, Guangzhou, 510630, China
| | - Xing Zhong
- Department of Nuclear Medicine, the First Hospital Affiliated to Jinan University, No. 613 Huangpu West Road, Guangzhou, 510630, China
| | - Xueyin Lin
- Department of Nuclear Medicine, the First Hospital Affiliated to Jinan University, No. 613 Huangpu West Road, Guangzhou, 510630, China
| | - Xinju Zhang
- Shenzhen Engineering Laboratory for Genomics-Assisted Animal Breeding, BGI-Shenzhen, Shenzhen, 518083, China
| | - Jun Liu
- Shenzhen Engineering Laboratory for Genomics-Assisted Animal Breeding, BGI-Shenzhen, Shenzhen, 518083, China
| | - Cong Liu
- Shenzhen Engineering Laboratory for Genomics-Assisted Animal Breeding, BGI-Shenzhen, Shenzhen, 518083, China
| | - Hao Xu
- Department of Nuclear Medicine, the First Hospital Affiliated to Jinan University, No. 613 Huangpu West Road, Guangzhou, 510630, China.
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20
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Struk M, Grygorcewicz B, Nawrotek P, Augustyniak A, Konopacki M, Kordas M, Rakoczy R. Enhancing effect of 50 Hz rotating magnetic field on induction of Shiga toxin-converting lambdoid prophages. Microb Pathog 2017; 109:4-7. [PMID: 28506884 DOI: 10.1016/j.micpath.2017.05.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Revised: 05/08/2017] [Accepted: 05/11/2017] [Indexed: 11/25/2022]
Abstract
Studies aimed at investigating factors and mechanism of induction of prophages, a major pathogenesis factor of Shiga toxin-producing Escherichia coli (STEC), are considered important to develop an effective treatment for STEC infections. In this study, we demonstrated the synergistic effect of the rotating magnetic field (RMF) of induction B = 34 mT and frequency ƒ = 50 Hz at a constant temperature of 37 °C and mitomycin C (MMC), that resulted in a higher level of induction of stx-carrying lambdoid Stx prophages. This is a first report on the induction of lambdoid Stx prophages in response to the enhancing effect of popular inductor (mitomycin C) under the influence of RMF.
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Affiliation(s)
- M Struk
- Department of Immunology, Microbiology and Physiological Chemistry, Faculty of Biotechnology and Animal Husbandry, West Pomeranian University of Technology, Szczecin, al. Piastów 45, 70-311 Szczecin, Poland
| | - B Grygorcewicz
- Department of Immunology, Microbiology and Physiological Chemistry, Faculty of Biotechnology and Animal Husbandry, West Pomeranian University of Technology, Szczecin, al. Piastów 45, 70-311 Szczecin, Poland
| | - P Nawrotek
- Department of Immunology, Microbiology and Physiological Chemistry, Faculty of Biotechnology and Animal Husbandry, West Pomeranian University of Technology, Szczecin, al. Piastów 45, 70-311 Szczecin, Poland.
| | - A Augustyniak
- Department of Immunology, Microbiology and Physiological Chemistry, Faculty of Biotechnology and Animal Husbandry, West Pomeranian University of Technology, Szczecin, al. Piastów 45, 70-311 Szczecin, Poland
| | - M Konopacki
- Department of Chemical Engineering, Institute of Chemical Engineering and Environmental Protection Processes, West Pomeranian University of Technology, Szczecin, al. Piastów 42, 71-065 Szczecin, Poland
| | - M Kordas
- Department of Chemical Engineering, Institute of Chemical Engineering and Environmental Protection Processes, West Pomeranian University of Technology, Szczecin, al. Piastów 42, 71-065 Szczecin, Poland
| | - R Rakoczy
- Department of Chemical Engineering, Institute of Chemical Engineering and Environmental Protection Processes, West Pomeranian University of Technology, Szczecin, al. Piastów 42, 71-065 Szczecin, Poland
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21
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Faleiro D, Immich S, Majolo F, Mayer L, Ethur E, Goettert M. GC/MS analysis and potential cytotoxic activity of Calyptranthes grandifolia (O. Berg) , Calyptranthes tricona (D. Legrand) and Myrciaria plinioides (D. Legrand) essential oil in RAW264.7 and CHO-K1 cells. Biomed Pharmacother 2017; 89:1431-1441. [DOI: 10.1016/j.biopha.2017.03.040] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 03/12/2017] [Accepted: 03/14/2017] [Indexed: 02/06/2023] Open
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22
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Sadri M, Abdolmaleki P, Abrun S, Beiki B, Samani FS. Static Magnetic Field Effect on Cell Alignment, Growth, and Differentiation in Human Cord-Derived Mesenchymal Stem Cells. Cell Mol Bioeng 2017; 10:249-262. [PMID: 31719863 DOI: 10.1007/s12195-017-0482-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 02/25/2017] [Indexed: 10/19/2022] Open
Abstract
This investigation is performed to evaluate the impact of static magnetic field on the Cell growth alignment, and differentiation potential in Human Mesenchymal Stem cells derived from human newborn cords. In vitro-cultured mesenchymal stem cells derived from human newborn cords were exposed to SMF up to 24 mT and compared with the control (unexposed) cultures. Viability was assessed via Trypan Blue staining and MTT assay. Cell cycle progression was studied after flow cytometry data analysis. Sox-2, Nanong, and Oct-4 Primers used for RT-PCR experiment. Morphological studies showed that the exposed cells were significantly aligned in parallel bundles in a correlation with the magnetic field lines. Viability measurements showed a significant reduction in cell viability which was noted after exposure to static magnetic field and initiated 36 h after the end of exposure time. Flow cytometric data analysis confirmed a decrease in G1 phase cell population within the treated and cultured groups compared with the corresponding control samples. However, the induced changes were recovered in the cell cultures after the post-exposure culture recovery time which may be attributed to the cellular repair mechanisms. Furthermore, the proliferation rate and Oct-4 gene expression were reduced due to the 18 mT static magnetic field exposure. The significant proliferation rate decrease accompanied by the Sox-2, Nanong, and Oct-4 gene expression decline, suggested the differentiation inducing effects of SMF exposure. Exposure to Static Magnetic fields up to 24 mT affects mesenchymal stem cell alignment and proliferation rate as well as mRNA expression of Sox-2, Nanong, and Oct-4 genes, therefore can be considered as a new differentiation inducer in addition to the other stimulators.
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Affiliation(s)
- Maryam Sadri
- 1Department of Biophysics, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box 1415-154, Tehran, Iran
| | - Parviz Abdolmaleki
- 1Department of Biophysics, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box 1415-154, Tehran, Iran
| | - Saeid Abrun
- 2Department of Hematology, Faculty of Biological Sciences, Tarbiat Modares University (TMU), P.O. Box 14115-175, Tehran, Iran.,Royan Stem Cell Technology Company (Cord Blood Bank), Tehran, Iran
| | - Bahareh Beiki
- Royan Stem Cell Technology Company (Cord Blood Bank), Tehran, Iran
| | - Fazel Sahraneshin Samani
- 4Department of Stem Cells and Developmental Biology at Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
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Zhang L, Hou Y, Li Z, Ji X, Wang Z, Wang H, Tian X, Yu F, Yang Z, Pi L, Mitchison TJ, Lu Q, Zhang X. 27 T ultra-high static magnetic field changes orientation and morphology of mitotic spindles in human cells. eLife 2017; 6. [PMID: 28244368 PMCID: PMC5370190 DOI: 10.7554/elife.22911] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Accepted: 02/26/2017] [Indexed: 12/12/2022] Open
Abstract
Purified microtubules have been shown to align along the static magnetic field (SMF) in vitro because of their diamagnetic anisotropy. However, whether mitotic spindle in mammalian cells can be aligned by magnetic field has not been experimentally proved. In particular, the biological effects of SMF of above 20 T (Tesla) on mammalian cells have never been reported. Here we found that in both CNE-2Z and RPE1 human cells spindle orients in 27 T SMF. The direction of spindle alignment depended on the extent to which chromosomes were aligned to form a planar metaphase plate. Our results show that the magnetic torque acts on both microtubules and chromosomes, and the preferred direction of spindle alignment relative to the field depends more on chromosome alignment than microtubules. In addition, spindle morphology was also perturbed by 27 T SMF. This is the first reported study that investigated the mammalian cellular responses to ultra-high magnetic field of above 20 T. Our study not only found that ultra-high magnetic field can change the orientation and morphology of mitotic spindles, but also provided a tool to probe the role of spindle orientation and perturbation in developmental and cancer biology. DOI:http://dx.doi.org/10.7554/eLife.22911.001 Nowadays, a number of methods can be used to ‘look’ inside the body to investigate potential health problems. One of these is a technique called magnetic resonance imaging (MRI) that uses magnetic fields that are several hundred times stronger than a fridge magnet (or over 10,000 times stronger than the Earth’s natural magnetic field) to generate images of the inside of the body. In general, stronger magnetic fields enable higher quality images to be obtained. However, the effects of exposing the body’s cells to these magnetic fields have not been fully determined. Like most other biological materials, protein polymers called microtubules can respond to high magnetic fields – for example, by aligning with the field. Microtubules play a number of roles inside cells. This includes forming the mitotic spindle that separates copies of chromosomes – the structures in which the majority of a cell’s genetic material is stored – equally between dividing cells. The orientation of the mitotic spindle determines the direction in which a cell will divide. This direction is important for generating different types of cells and tissues. Furthermore, many cancerous cells have incorrectly oriented spindles. Zhang, Hou et al. have now exposed cancerous and normal human cells to magnetic fields of varying strengths. The maximum magnetic field strength tested (27 Tesla – or around 10 times the highest field strengths produced by standard hospital MRI scanners) did not kill the cells after four hours of exposure, but the orientation of the spindles inside the cells did change. In addition, the 27 Tesla magnetic field caused spindles that were perpendicular to the direction of the field to widen. At an intermediate field strength (9 Tesla – a magnetic field strength that has been used in some experimental MRI scanners), the orientation of the spindle only changed after three days of continuous exposure to the magnetic field. Lower field strengths (such as those currently used in hospital MRI scanners) did not alter the orientation of the spindle even after seven days of exposure. Zhang, Hou et al. also observed that the magnetic field acts on both the microtubules and chromosomes. However, the alignment of the chromosomes in the cell was the greatest determinant of the direction in which the spindle would align itself in response to the magnetic field. The next step is to analyze the consequences of magnetic field-induced spindle orientation changes – can these lead to cancer or reduce cancer growth, or change how animal tissues develop? Understanding how to control the position of the spindle could also ultimately make it possible to use ultra-high magnetic fields to engineer tissues or stimulate their regeneration. DOI:http://dx.doi.org/10.7554/eLife.22911.002
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Affiliation(s)
- Lei Zhang
- High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, China.,University of Science and Technology of China, Hefei, China
| | - Yubin Hou
- High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, China
| | - Zhiyuan Li
- High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, China
| | - Xinmiao Ji
- High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, China
| | - Ze Wang
- High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, China.,University of Science and Technology of China, Hefei, China
| | - Huizhen Wang
- High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, China.,University of Science and Technology of China, Hefei, China
| | - Xiaofei Tian
- High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, China.,University of Science and Technology of China, Hefei, China
| | - Fazhi Yu
- University of Science and Technology of China, Hefei, China
| | - Zhenye Yang
- University of Science and Technology of China, Hefei, China
| | - Li Pi
- High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, China.,University of Science and Technology of China, Hefei, China
| | - Timothy J Mitchison
- Department of Systems Biology, Harvard Medical School, Boston, United States
| | - Qingyou Lu
- High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, China.,University of Science and Technology of China, Hefei, China.,Collaborative Innovation Center of Advanced Microstructure, Nanjing University, Nanjing, China
| | - Xin Zhang
- High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, China
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24
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Wang L, Hoogcarspel SJ, Wen Z, van Vulpen M, Molkentine DP, Kok J, Lin SH, Broekhuizen R, Ang KK, Bovenschen N, Raaymakers BW, Frank SJ. Biological responses of human solid tumor cells to X-ray irradiation within a 1.5-Tesla magnetic field generated by a magnetic resonance imaging-linear accelerator. Bioelectromagnetics 2016; 37:471-80. [PMID: 27434783 DOI: 10.1002/bem.21991] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Accepted: 06/30/2016] [Indexed: 01/20/2023]
Abstract
Devices that combine magnetic resonance imaging with linear accelerators (MRL) represent a novel tool for MR-guided radiotherapy. However, whether magnetic fields (MFs) generated by these devices affect the radiosensitivity of tumors is unknown. We investigated the influence of a 1.5-T MF on cell viability and radioresponse of human solid tumors. Human head/neck cancer and lung cancer cells were exposed to single or fractionated 6-MV X-ray radiation; effects of the MF on cell viability were determined by cell plating efficiency and on radioresponsiveness by clonogenic cell survival. Doses needed to reduce the fraction of surviving cells to 37% of the initial value (D0s) were calculated for multiple exposures to MF and radiation. Results were analyzed using Student's t-tests. Cell viability was no different after single or multiple exposures to MRL than after exposure to a conventional linear accelerator (Linac, without MR-generated MF) in 12 of 15 experiments (all P > 0.05). Single or multiple exposures to MF had no influence on cell radioresponse (all P > 0.05). Cells treated up to four times with an MRL or a Linac further showed no changes in D0s with MF versus without MF (all P > 0.05). In conclusion, MF within the MRL does not seem to affect in vitro tumor radioresponsiveness as compared with a conventional Linac. Bioelectromagnetics. 37:471-480, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Li Wang
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Stan Jelle Hoogcarspel
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Zhifei Wen
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Marco van Vulpen
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - David P Molkentine
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Jan Kok
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Steven H Lin
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Roel Broekhuizen
- Department of Pathology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Kie-Kian Ang
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Niels Bovenschen
- Department of Pathology, University Medical Center Utrecht, Utrecht, The Netherlands.,Laboratory of Translational Immunology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Bas W Raaymakers
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Steven J Frank
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas.
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Albuquerque WWC, Costa RMPB, Fernandes TDSE, Porto ALF. Evidences of the static magnetic field influence on cellular systems. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2016; 121:16-28. [DOI: 10.1016/j.pbiomolbio.2016.03.003] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 03/10/2016] [Indexed: 01/29/2023]
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Urbas K, Jedrzejczak-Silicka M, Rakoczy R, Zaborski D, Mijowska E. Effect of GO-Fe3O4 and rotating magnetic field on cellular metabolic activity of mammalian cells. J Biomater Appl 2016; 30:1392-406. [PMID: 26809700 DOI: 10.1177/0885328216628762] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The effect of hybrid material-graphene flakes with Fe3O4 nanospheres (GO-Fe3O4), graphene oxide (GO) and magnetite nanospheres (Fe3O4) in rotating magnetic field on mammalian cells metabolism has been studied. Several reports shown that exposure to magnetic field may have influence on cellular membrane permeability. Thus, the aim of presented study was to determine the cellular response of L929 fibroblast cells to nanomaterials and rotating magnetic field for 8-h exposure experiment. The GO had tendency to adsorb proteins, thus cell metabolism was decreased and the effect of that mechanism was enhanced by impact of nanospheres and rotating magnetic field. The highest reduction of cellular metabolism was recorded for WST-1 and NR assays at concentration 100 µg/mL of all tested nanomaterials and magnetic induction value 10.06 mT. The lactate dehydrogenase leakage assay has shown significant changes in membrane permeability. Further studies need to be carried out to precisely determine the mechanism of that process.
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Affiliation(s)
- Karolina Urbas
- Department of Environmental and Chemical Engineering, West Pomeranian University of Technology, Szczecin, Poland
| | | | - Rafal Rakoczy
- Institute of Chemical Engineering and Environmental Protection Process, West Pomeranian University of Technology, Szczecin, Poland
| | - Daniel Zaborski
- Laboratory of Biostatistics, West Pomeranian University of Technology, Szczecin, Poland
| | - Ewa Mijowska
- Department of Environmental and Chemical Engineering, West Pomeranian University of Technology, Szczecin, Poland
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1 T moderate intensity static magnetic field affects Akt/mTOR pathway and increases the antitumor efficacy of mTOR inhibitors in CNE-2Z cells. Sci Bull (Beijing) 2015. [DOI: 10.1007/s11434-015-0950-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Abstract
Magnetic resonance imaging (MRI) is being integrated into radiotherapy delivery for MRI-guided radiotherapy. The purpose of this work is to investigate theoretically the upper limit of any potential magnetic effect on the α/β ratio, an important radiobiological parameter in radiation therapy. Based on the theory of dual radiation action, the α/β ratio can be expressed by an integral of the product of two microdosimetry quantities (x) and t(x), where (x) is the probability that two energy transfers, a distance x apart, results in a lesion, and t(x) is the proximity function, which is the energy-weighted pointpair distribution of distances between energy transfer points in a track. The quantity t(x) depends on the applied magnetic field. An analytical approach has been used to derive a formula that can be used to calculate the α/β ratio in an extremely strong magnetic field, which gives the upper limit of the potential changes of the α/β ratio due to the presence of a magnetic field. For V79 Chinese hamster cells the upper limit of the increase of the α/β ratio with a magnetic field has been found to be 2.90 times for Pd-103, 2.97 times for I-125 and 2.3 times for Co-60 sources.
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Affiliation(s)
- G Pang
- Odette Cancer Centre, 2075 Bayview Avenue, Toronto M4N 3M5, Canada. Sunnybrook Research Institute and Departments of Radiation Oncology and Medical Biophysics, University of Toronto, Toronto, Canada
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Yagci F, Kesim B. Cytotoxic and genotoxic effects on gingival fibroblasts from static magnetic fields produced by dental magnetic attachments. Gerodontology 2015; 33:421-7. [PMID: 25677331 DOI: 10.1111/ger.12191] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/09/2015] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To investigate cytotoxic and genotoxic effects of static magnetic field (SMF) produced by dental magnetic attachments on human gingival fibroblasts in vitro. BACKGROUND Magnetic attachments have numerous roles in dental prosthesis fixation, but few reports evaluate possible biological effects of static magnetic field (SMF) on human gingival tissues, particular genotoxic effects. MATERIALS AND METHODS The Dyna (500-gr breakaway force) and Steco (173-gr breakaway force) dental magnetic attachments were embedded into autopolymerising acrylic resin in four different configurations each, including single and double magnets. Gingival biopsy was performed on 28 individuals during third molar extraction, and each sample was divided into two pieces for culture under SMF exposure or as a control. In total, seven test and seven control gingival fibroblast cultures were performed for each group resulting in 56 gingival fibroblast cultures. The test culture flasks were placed atop the magnet-embedded resin blocks. After cultures were terminated, mitotic index (MI) and micronucleus (MN) rates were analysed at a p = 0.05 significance level by Wilcoxon's test; intergroup differences were analysed with a Kruskal-Wallis test. RESULTS There was no significant difference in intragroup or intergroup MI rates. The double Dyna (p = 0.023) and double Steco (p = 0.016) groups had statistically significant intragroup differences in the MN rates. There were no statistically significant differences in MN rates in intergroup analyses. CONCLUSION In particular, higher magnetic fields from dental magnetic attachments might be toxic genetically to human gingival fibroblasts. However, there is need for further investigations from different aspects to detect any genotoxicity.
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Affiliation(s)
- Filiz Yagci
- Department of Prosthodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkey
| | - Bulent Kesim
- Department of Prosthodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkey
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Plunk MR, Chapman T. The fundamentals of fetal MR imaging: Part 1. Curr Probl Diagn Radiol 2014; 43:331-46. [PMID: 25060713 DOI: 10.1067/j.cpradiol.2014.05.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Accepted: 05/22/2014] [Indexed: 11/22/2022]
Abstract
Congenital malformations detected in any fetal system using ultrasound may be further evaluated with magnetic resonance imaging (MRI) to improve counseling, to plan deliveries appropriately, and sometimes to enable fetal interventions. In this first half of a 2-part review, the history and safety factors regarding fetal MRI, as well as the practical aspects of image acquisition, are discussed. In addition, as central nervous system anomalies are most commonly and best evaluated using fetal MRI, challenging central nervous system anomalies, such as fetal ventriculomegaly, posterior anomalies, and neural tube defects, detected using prenatal ultrasound are also reviewed with a focus on the fundamental implications of these diagnoses.
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Affiliation(s)
- Matthew R Plunk
- Department of Radiology, University of Washington School of Medicine, Seattle, WA
| | - Teresa Chapman
- Department of Radiology, University of Washington School of Medicine, Seattle, WA; Department of Radiology, Seattle Children׳s Hospital, Seattle, WA.
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Fu YC, Lin CC, Chang JK, Chen CH, Tai IC, Wang GJ, Ho ML. A novel single pulsed electromagnetic field stimulates osteogenesis of bone marrow mesenchymal stem cells and bone repair. PLoS One 2014; 9:e91581. [PMID: 24632682 PMCID: PMC3954729 DOI: 10.1371/journal.pone.0091581] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Accepted: 02/12/2014] [Indexed: 11/28/2022] Open
Abstract
Pulsed electromagnetic field (PEMF) has been successfully applied to accelerate fracture repair since 1979. Recent studies suggest that PEMF might be used as a nonoperative treatment for the early stages of osteonecrosis. However, PEMF treatment requires a minimum of ten hours per day for the duration of the treatment. In this study, we modified the protocol of the single-pulsed electromagnetic field (SPEMF) that only requires a 3-minute daily treatment. In the in vitro study, cell proliferation and osteogenic differentiation was evaluated in the hBMSCs. In the in vivo study, new bone formation and revascularization were evaluated in the necrotic bone graft. Results from the in vitro study showed no significant cytotoxic effects on the hBMSCs after 5 days of SPEMF treatment (1 Tesla, 30 pulses per day). hBMSC proliferation was enhanced in the SPEMF-treated groups after 2 and 4 days of treatment. The osteogenic differentiation of hBMSCs was significantly increased in the SPEMF-treated groups after 3–7 days of treatment. Mineralization also increased after 10, 15, 20, and 25 days of treatment in SPEMF-treated groups compared to the control group. The 7-day short-course treatment achieved similar effects on proliferation and osteogenesis as the 25-day treatment. Results from the in vivo study also demonstrated that both the 7-day and 25-day treatments of SPEMF increased callus formation around the necrotic bone and also increased new vessel formation and osteocyte numbers in the grafted necrotic bone at the 2nd and 4th weeks after surgery. In conclusion, the newly developed SPEMF accelerates osteogenic differentiation of cultured hBMSCs and enhances bone repair, neo-vascularization, and cell growth in necrotic bone in mice. The potential clinical advantage of the SPEMF is the short daily application and the shorter treatment course. We suggest that SPEMF may be used to treat fractures and the early stages of osteonecrosis.
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Affiliation(s)
- Yin-Chih Fu
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Orthopaedics, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Orthopaedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Orthopaedics, Kaohsiung Municipal Hsiao-Kang Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chih-Chun Lin
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Physiology, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Je-Ken Chang
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Orthopaedics, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Orthopaedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chung-Hwan Chen
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Orthopaedics, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Orthopaedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - I-Chun Tai
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Physiology, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Gwo-Jaw Wang
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Orthopaedics, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Orthopaedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Mei-Ling Ho
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Orthopaedics, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Physiology, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- * E-mail:
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Teodori L, Giovanetti A, Albertini MC, Rocchi M, Perniconi B, Valente MG, Coletti D. Static magnetic fields modulate X-ray-induced DNA damage in human glioblastoma primary cells. JOURNAL OF RADIATION RESEARCH 2014; 55:218-227. [PMID: 24345558 PMCID: PMC3951070 DOI: 10.1093/jrr/rrt107] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Revised: 07/26/2013] [Accepted: 08/02/2013] [Indexed: 06/03/2023]
Abstract
Although static magnetic fields (SMFs) are used extensively in the occupational and medical fields, few comprehensive studies have investigated their possible genotoxic effect and the findings are controversial. With the advent of magnetic resonance imaging-guided radiation therapy, the potential effects of SMFs on ionizing radiation (IR) have become increasingly important. In this study we focused on the genotoxic effect of 80 mT SMFs, both alone and in combination with (i.e. preceding or following) X-ray (XR) irradiation, on primary glioblastoma cells in culture. The cells were exposed to: (i) SMFs alone; (ii) XRs alone; (iii) XR, with SMFs applied during recovery; (iv) SMFs both before and after XR irradiation. XR-induced DNA damage was analyzed by Single Cell Gel Electrophoresis assay (comet assay) using statistical tools designed to assess the tail DNA (TD) and tail length (TL) as indicators of DNA fragmentation. Mitochondrial membrane potential, known to be affected by IR, was assessed using the JC-1 mitochondrial probe. Our results showed that exposure of cells to 5 Gy of XR irradiation alone led to extensive DNA damage, which was significantly reduced by post-irradiation exposure to SMFs. The XR-induced loss of mitochondrial membrane potential was to a large extent averted by exposure to SMFs. These data suggest that SMFs modulate DNA damage and/or damage repair, possibly through a mechanism that affects mitochondria.
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Affiliation(s)
- Laura Teodori
- Radiation Development and Application, UTAPRAD-DIM, ENEA, Via Enrico Fermi 45, Frascati, Rome 00044, Italy
- Fondazione San Raffaele, SS Ceglie San Michele Km 1.2, Ceglie Messapica 72013, Italy
| | - Anna Giovanetti
- Radiation Biology and Human Health UTBIORAD, ENEA, Via Anguillarese 301, Casaccia, Rome 00123, Italy
| | | | - Marco Rocchi
- Institute of Biomathematics, University of Urbino ‘Carlo Bo’, Via Saffi 2, Urbino 61029, Italy
| | - Barbara Perniconi
- UPMC Paris 06, UR4 Aging, Stress and Inflammation, 7 Quai Saint Bernard, Paris 75252, France
| | | | - Dario Coletti
- UPMC Paris 06, UR4 Aging, Stress and Inflammation, 7 Quai Saint Bernard, Paris 75252, France
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Abstract
Many assumptions are made when imaging children. In particular a judgement is made regarding how safe or unsafe each imaging modality is, using relatively arbitrary definitions and distinctions, due to the lack of robust scientific data. Here, the latest evidence is reviewed, particularly regarding the medical exposure to ionizing radiation (X-rays and CT) and MRI in childhood. The best evidence currently available suggests a small but convincing risk of cumulative low-dose ionizing radiation in children. Given our predictions for the children imaged today, it seems reasonable to pursue non-ionizing-based techniques wherever possible, although there is emerging evidence that MRI and ultrasound may have hitherto unknown effects. As our knowledge base expands, we must continually review our practice in light of the latest scientific data.
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Affiliation(s)
| | - Alvhild Alette Bj⊘rkum
- Departments of Biomedical Laboratory
Sciences and Chemical Engineering, Faculty of Engineering, Bergen University
College, Bergen, Norway
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Bajpai I, Balani K, Basu B. Synergistic effect of static magnetic field and HA-Fe3O4 magnetic composites on viability of S. aureus and E. coli bacteria. J Biomed Mater Res B Appl Biomater 2013; 102:524-32. [PMID: 24142888 DOI: 10.1002/jbm.b.33031] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2013] [Revised: 08/10/2013] [Accepted: 08/18/2013] [Indexed: 11/08/2022]
Abstract
In addressing the issue of prosthetic infection, this work demonstrated the synergistic effect of the application of static magnetic field (SMF) and ferrimagnetic substrate properties on the bactericidal property in vitro. This aspect was studied using hydroxyapatite (HA)-xFe3 O4 (x=10, 20, and 40 wt.%) substrates, which have different saturation magnetization properties. During bacteria culture experiments, 100 mT SMF was applied to growth medium (with HA-xFe3 O4 substrate) in vitro for 30, 120, and 240 min. A combination of MTT assay, membrane rupture assays, live/dead assay, and fluorescence microscopic analysis showed that the bactericidal effect of SMF increases with the exposure duration as well as increasing Fe3 O4 content in biomaterial substrates. Importantly, the synergistic bactericidal effect was found to be independent of bacterial cell type, as similar qualitative trend is measured with both gram negative Escherichia coli (E. coli) and gram positive Staphylococcus aureus (S. aureus) strains. The reduction in E. coli viability was 83% higher on HA-40 Wt % Fe3 O4 composite after 4 h exposure to SMF as compared to nonexposed control. Interestingly, any statistically significant difference in ROS was not observed in bacterial growth medium after magnetic field exposure, indicating the absence of ROS enhancement due to magnetic field. Overall, this study illustrates significant role being played by magnetic substrate compositions towards bactericidal property than by magnetic field exposure alone.
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Affiliation(s)
- Indu Bajpai
- Department of Materials Science and Engineering, Laboratory for Biomaterials, Indian Institute of Technology, Kanpur, 208016, Uttar Pradesh, India
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Park JW, Ku SH, Moon HH, Lee M, Choi D, Yang J, Huh YM, Jeong JH, Park TG, Mok H, Kim SH. Cross-linked iron oxide nanoparticles for therapeutic engineering and in vivo monitoring of mesenchymal stem cells in cerebral ischemia model. Macromol Biosci 2013; 14:380-9. [PMID: 24634264 DOI: 10.1002/mabi.201300340] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Revised: 09/03/2013] [Indexed: 12/27/2022]
Abstract
Poly(ethylene glycol)-coated cross-linked iron oxide nanoparticles (PCIONs) are developed for therapeutic engineering of mesenchymal stem cells (MSCs) and their monitoring via magnetic resonance (MR) imaging at a time. PCIONs successfully combine with plasmid DNA (pDNA) via ionic interaction. Accordingly, PCION/pDNA complexes mediate superior translocations of vascular endothelial growth factor (VEGF) pDNA into intracellular regions of MSCs under external magnetic field, which significantly elevate production of VEGF from MSCs. Genetically engineered MSCs are also clearly visualized via MR imaging after administration to rat cerebrovascular ischemia models, which enable tracking of MSCs migration from injected sites to injured ischemic area.
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Affiliation(s)
- Ji Won Park
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 305-701, Republic of Korea
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Bioeffects of static magnetic fields: oxidative stress, genotoxic effects, and cancer studies. BIOMED RESEARCH INTERNATIONAL 2013; 2013:602987. [PMID: 24027759 PMCID: PMC3763575 DOI: 10.1155/2013/602987] [Citation(s) in RCA: 115] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Revised: 07/11/2013] [Accepted: 07/11/2013] [Indexed: 01/24/2023]
Abstract
The interaction of static magnetic fields (SMFs) with living organisms is a rapidly growing field of investigation. The magnetic fields (MFs) effect observed with radical pair recombination is one of the well-known mechanisms by which MFs interact with biological systems. Exposure to SMF can increase the activity, concentration, and life time of paramagnetic free radicals, which might cause oxidative stress, genetic mutation, and/or apoptosis. Current evidence suggests that cell proliferation can be influenced by a treatment with both SMFs and anticancer drugs. It has been recently found that SMFs can enhance the anticancer effect of chemotherapeutic drugs; this may provide a new strategy for cancer therapy. This review focuses on our own data and other data from the literature of SMFs bioeffects. Three main areas of investigation have been covered: free radical generation and oxidative stress, apoptosis and genotoxicity, and cancer. After an introduction on SMF classification and medical applications, the basic phenomena to understand the bioeffects are described. The scientific literature is summarized, integrated, and critically analyzed with the help of authoritative reviews by recognized experts; international safety guidelines are also cited.
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Alcaraz M, Olmos E, Alcaraz-Saura M, Achel DG, Castillo J. Effect of long-term 50 Hz magnetic field exposure on the micronucleated polychromatic erythrocytes of mice. Electromagn Biol Med 2013; 33:51-7. [DOI: 10.3109/15368378.2013.783851] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Chen CH, Lin YS, Fu YC, Wang CK, Wu SC, Wang GJ, Eswaramoorthy R, Wang YH, Wang CZ, Wang YH, Lin SY, Chang JK, Ho ML. Electromagnetic fields enhance chondrogenesis of human adipose-derived stem cells in a chondrogenic microenvironment in vitro. J Appl Physiol (1985) 2013; 114:647-55. [DOI: 10.1152/japplphysiol.01216.2012] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
We tested the hypothesis that electromagnetic field (EMF) stimulation enhances chondrogenesis in human adipose-derived stem cells (ADSCs) in a chondrogenic microenvironment. A two-dimensional hyaluronan (HA)-coated well (2D-HA) and a three-dimensional pellet culture system (3D-pellet) were used as chondrogenic microenvironments. The ADSCs were cultured in 2D-HA or 3D-pellet, and then treated with clinical-use pulse electromagnetic field (PEMF) or the innovative single-pulse electromagnetic field (SPEMF) stimulation. The cytotoxicity, cell viability, and chondrogenic and osteogenic differentiations were analyzed after PEMF or SPEMF treatment. The modules of PEMF and SPEMF stimulations used in this study did not cause cytotoxicity or alter cell viability in ADSCs. Both PEMF and SPEMF enhanced the chondrogenic gene expression (SOX-9, collagen type II, and aggrecan) of ADSCs cultured in 2D-HA and 3D-pellet. The expressions of bone matrix genes (osteocalcin and collagen type I) of ADSCs were not changed after SPEMF treatment in 2D-HA and 3D-pellet; however, they were enhanced by PEMF treatment. Both PEMF and SPEMF increased the cartilaginous matrix (sulfated glycosaminoglycan) deposition of ADSCs. However, PEMF treatment also increased mineralization of ADSCs, but SPEMF treatment did not. Both PEMF and SPEMF enhanced chondrogenic differentiation of ADSCs cultured in a chondrogenic microenvironment. SPEMF treatment enhanced ADSC chondrogenesis, but not osteogenesis, when the cells were cultured in a chondrogenic microenvironment. However, PEMF enhanced both osteogenesis and chondrogenesis under the same conditions. Thus the combination of a chondrogenic microenvironment with SPEMF stimulation can promote chondrogenic differentiation of ADSCs and may be applicable to articular cartilage tissue engineering.
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Affiliation(s)
- Chung-Hwan Chen
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University
- Department of Orthopedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University
- Departments of Orthopedics, Faculty of Medicine, College of Medicine, Kaohsiung Medical University
- Graduate Institute of Medicine, Kaohsiung Medical University
| | - Yi-Shan Lin
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University
- Department of Physiology, College of Medicine, Kaohsiung Medical University
| | - Yin-Chih Fu
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University
- Department of Orthopedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University
- Departments of Orthopedics, Faculty of Medicine, College of Medicine, Kaohsiung Medical University
- Graduate Institute of Medicine, Kaohsiung Medical University
| | - Chih-Kuang Wang
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University
- Department of Medicinal and Applied Chemistry, College of Life Science, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Shun-Cheng Wu
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University
| | - Gwo-Jaw Wang
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University
- Departments of Orthopedics, Faculty of Medicine, College of Medicine, Kaohsiung Medical University
- Medical Device Innovation Center, National Cheng-Kung University
- Skeleton-Joint Research Center, National Cheng-Kung University
- Graduate Institute of Biomedical Engineering, National Cheng-Kung University, Tainan, Taiwan; and
| | | | - Yan-Hsiung Wang
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University
- School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chau-Zen Wang
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University
- Department of Physiology, College of Medicine, Kaohsiung Medical University
| | - Yao-Hsien Wang
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University
| | - Sung-Yen Lin
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University
- Department of Orthopedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University
- Departments of Orthopedics, Faculty of Medicine, College of Medicine, Kaohsiung Medical University
- Graduate Institute of Medicine, Kaohsiung Medical University
- Department of Orthopedics, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung City, Taiwan
| | - Je-Ken Chang
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University
- Department of Orthopedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University
- Departments of Orthopedics, Faculty of Medicine, College of Medicine, Kaohsiung Medical University
- Department of Orthopedics, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung City, Taiwan
| | - Mei-Ling Ho
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University
- Department of Physiology, College of Medicine, Kaohsiung Medical University
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Mok H, Zhang M. Superparamagnetic iron oxide nanoparticle-based delivery systems for biotherapeutics. Expert Opin Drug Deliv 2012. [PMID: 23199200 DOI: 10.1517/17425247.2013.747507] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
INTRODUCTION Superparamagnetic iron oxide nanoparticle (SPION)-based carrier systems have many advantages over other nanoparticle-based systems. They are biocompatible, biodegradable, facilely tunable and superparamagnetic and thus controllable by an external magnetic field. These attributes enable their broad biomedical applications. In particular, magnetically driven carriers are drawing considerable interest as an emerging therapeutic delivery system because of their superior delivery efficiency. AREAS COVERED This article reviews the recent advances in use of SPION-based carrier systems to improve the delivery efficiency and target specificity of biotherapeutics. The authors examine various formulations of SPION-based delivery systems, including SPION micelles, clusters, hydrogels, liposomes and micro/nanospheres, as well as their specific applications in delivery of biotherapeutics. EXPERT OPINION Recently, biotherapeutics including therapeutic cells, proteins and genes have been studied as alternative treatments to various diseases. Despite the advantages of high target specificity and low adverse effects, clinical translation of biotherapeutics has been hindered by the poor stability and low delivery efficiency compared with chemical drugs. Accordingly, biotherapeutic delivery systems that can overcome these limitations are actively pursued. SPION-based materials can be ideal candidates for developing such delivery systems because of their excellent biocompatibility and superparamagnetism that enables long-term accumulation/retention at target sites by utilization of a suitable magnet. In addition, synthesis technologies for production of finely tuned, homogeneous SPIONs have been well developed, which may promise their rapid clinical translation.
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Affiliation(s)
- Hyejung Mok
- Konkuk University, Department of Bioscience and Biotechnology, Seoul 143-701, Republic of Korea
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Effect of static magnetic field on the induction of micronuclei by some mutagens. Environ Health Prev Med 2012; 11:228-32. [PMID: 21432350 DOI: 10.1007/bf02898011] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2006] [Accepted: 05/31/2006] [Indexed: 10/22/2022] Open
Abstract
OBJECTIVES It is important to assess the risk of static magnetic fields (SMFs) on human health, because epidemiological studies have indicated that SMFs play a role in the development of diseases such as leukemia and brain tumor. In our environment, we have numerous chances to be exposed to not only SMFs but also many chemicals containing mutagens. The aim of this study is to investigate the effect of SMFs on the induction of micronuclei induced by some mutagens. METHODS BALB/c mice were exposed to 4.7 tesla (T) SMF for 24 hr immediately after the injection of carboquone (alkylating agent), colcemid (spindle poison), mitomycin C (cross-linking agent), vincristine (spindle poison), sodium fluoride (a byproduct of aluminum plants under strong SMF) or 1-ethyl-1-nitrosourea (brain tumor-, gliomas- and thymic lymphoma-inducing chemical). RESULTS The frequency of micronuclei induced by six mutagens increased after co-exposure to SMF. CONCLUSIONS An additive/synergistic effect of SMF and chemicals was observed from the results of increased frequency of micronuclei induced by mutagens in mouse bone marrow erythrocytes.
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Shin J, Yoo CH, Lee J, Cha M. Cell response induced by internalized bacterial magnetic nanoparticles under an external static magnetic field. Biomaterials 2012; 33:5650-7. [PMID: 22571804 DOI: 10.1016/j.biomaterials.2012.04.033] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2012] [Accepted: 04/12/2012] [Indexed: 10/28/2022]
Abstract
Magnetic nanoparticles are widely used in bioapplications such as imaging and targeting tool. Their magnetic nature allows for the more efficient bioapplications by an external field gradient. However their combined effects have not yet been extensively characterized. Herein, we first demonstrate the biological effects of the communications between internalized bacterial magnetic nanoparticles (BMPs) and an external static magnetic field (SMF) on a standard human cell line. Combination of the BMPs and SMF act as the key factor leading to the alteration of cell structure and the enhanced cell growth. Also, their interaction reduced the apoptotic efficiency of human tumor cells induced by anticancer drugs. Microarray analysis suggests that these phenomena were caused by the alterations of GPCRs-mediated signal transduction originated in the interaction of internalized BMPs and the external SMF. Our findings may offer new approach for targeted cell therapy with the advantage of controlling cell viability by magnetic stimulation.
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Affiliation(s)
- Jaeha Shin
- School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, South Korea
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Lee CH, Chen HM, Yeh LK, Hong MY, Huang GS. Dosage-dependent induction of behavioral decline in Caenorhabditis elegans by long-term treatment of static magnetic fields. JOURNAL OF RADIATION RESEARCH 2012; 53:24-32. [PMID: 22302042 DOI: 10.1269/jrr.11057] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The aim of this work was to explore the molecular mechanisms associated with possible health hazards induced by static magnetic fields (SMFs). Nematodes were grown under SMFs at field strengths from 0 to 200 mT, and the speed of body movement was measured. The effects of exposure to static magnetic fields were observed to be significant in the higher field strength and longer treatment. To explore the possible molecular mechanisms responsible for these effects, semi-quantitative real-time RT-PCR was performed using primers specific to 120 randomly selected genes. Twenty-six differentially expressed genes among apoptosis-, oxidative stress-, and cancer-related genes were identified, indicating that a global molecular response to SMF treatment occurred. The induction of apoptosis was verified by the increase of fluorescence in a terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay, by the caspase-3 activity assay, and by immunostaining using an antibody against the ced-3 gene product. Mutations in genes involved in major apoptotic pathways, that is, ced-3, ced-4, and ced-9, abolished this SMF-induced behavioral decline; this is consistent with the hypothesis that the apoptosis pathways are involved in the SMF-induced mobility decline. Here we show that long-term and low-dosage exposure to SMF is capable of inducing an apoptosis-mediated behavioral decline in nematodes.
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Affiliation(s)
- Chia-Hui Lee
- Department of Material Science and Engineering, National Chiao Tung University, Taiwan, ROC
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Sakurai T, Hashimoto A, Kiyokawa T, Kikuchi K, Miyakoshi J. Myotube orientation using strong static magnetic fields. Bioelectromagnetics 2011; 33:421-7. [DOI: 10.1002/bem.21701] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Accepted: 11/24/2011] [Indexed: 11/10/2022]
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Ramirez-Gordillo D, Trujillo-Provencio C, Knight VB, Serrano EE. Optimization of gene delivery methods in Xenopus laevis kidney (A6) and Chinese hamster ovary (CHO) cell lines for heterologous expression of Xenopus inner ear genes. In Vitro Cell Dev Biol Anim 2011; 47:640-52. [PMID: 21959846 PMCID: PMC4038349 DOI: 10.1007/s11626-011-9451-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2011] [Accepted: 08/28/2011] [Indexed: 12/11/2022]
Abstract
The Xenopus inner ear provides a useful model for studies of hearing and balance because it shares features with the mammalian inner ear, and because amphibians are capable of regenerating damaged mechanosensory hair cells. The structure and function of many proteins necessary for inner ear function have yet to be elucidated and require methods for analysis. To this end, we seek to characterize Xenopus inner ear genes outside of the animal model through heterologous expression in cell lines. As part of this effort, we aimed to optimize physical (electroporation), chemical (lipid-mediated; Lipofectamine™ 2000, Metafectene® Pro), and biological (viral-mediated; BacMam virus Cellular Lights™ Tubulin-RFP) gene delivery methods in amphibian (Xenopus; A6) cells and mammalian (Chinese hamster ovary (CHO)) cells. We successfully introduced the commercially available pEGFP-N3, pmCherry-N1, pEYFP-Tubulin, and Cellular Lights™ Tubulin-RFP fluorescent constructs to cells and evaluated their transfection or transduction efficiencies using the three gene delivery methods. In addition, we analyzed the transfection efficiency of a novel construct synthesized in our laboratory by cloning the Xenopus inner ear calcium-activated potassium channel β1 subunit, then subcloning the subunit into the pmCherry-N1 vector. Every gene delivery method was significantly more effective in CHO cells. Although results for the A6 cell line were not statistically significant, both cell lines illustrate a trend towards more efficient gene delivery using viral-mediated methods; however the cost of viral transduction is also much higher. Our findings demonstrate the need to improve gene delivery methods for amphibian cells and underscore the necessity for a greater understanding of amphibian cell biology.
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Affiliation(s)
- Daniel Ramirez-Gordillo
- Department of Biology, New Mexico State University, P.O. Box 30001, MSC 3AF, Las Cruces, NM 88003, USA
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Heilmaier C, Theysohn JM, Maderwald S, Kraff O, Ladd ME, Ladd SC. A large-scale study on subjective perception of discomfort during 7 and 1.5 T MRI examinations. Bioelectromagnetics 2011; 32:610-9. [DOI: 10.1002/bem.20680] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2010] [Accepted: 04/23/2011] [Indexed: 11/10/2022]
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Lee JW, Kim MS, Kim YJ, Choi YJ, Lee Y, Chung HW. Genotoxic effects of 3 T magnetic resonance imaging in cultured human lymphocytes. Bioelectromagnetics 2011; 32:535-42. [PMID: 21412810 DOI: 10.1002/bem.20664] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2010] [Accepted: 02/14/2011] [Indexed: 01/07/2023]
Abstract
The clinical and preclinical use of high-field intensity (HF, 3 T and above) magnetic resonance imaging (MRI) scanners have significantly increased in the past few years. However, potential health risks are implied in the MRI and especially HF MRI environment due to high-static magnetic fields, fast gradient magnetic fields, and strong radiofrequency electromagnetic fields. In this study, the genotoxic potential of 3 T clinical MRI scans in cultured human lymphocytes in vitro was investigated by analyzing chromosome aberrations (CA), micronuclei (MN), and single-cell gel electrophoresis. Human lymphocytes were exposed to electromagnetic fields generated during MRI scanning (clinical routine brain examination protocols: three-channel head coil) for 22, 45, 67, and 89 min. We observed a significant increase in the frequency of single-strand DNA breaks following exposure to a 3 T MRI. In addition, the frequency of both CAs and MN in exposed cells increased in a time-dependent manner. The frequencies of MN in lymphocytes exposed to complex electromagnetic fields for 0, 22, 45, 67, and 89 min were 9.67, 11.67, 14.67, 18.00, and 20.33 per 1000 cells, respectively. Similarly, the frequencies of CAs in lymphocytes exposed for 0, 45, 67, and 89 min were 1.33, 2.33, 3.67, and 4.67 per 200 cells, respectively. These results suggest that exposure to 3 T MRI induces genotoxic effects in human lymphocytes.
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Affiliation(s)
- Joong Won Lee
- Graduate School of Public Health, Seoul National University, Gwanak-gu, Seoul, Republic of Korea
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Lee CH, Hung YC, Huang GS. Static magnetic field accelerates aging and development in nematode. Commun Integr Biol 2011; 3:528-9. [PMID: 21331230 DOI: 10.4161/cib.3.6.12749] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2010] [Accepted: 06/18/2010] [Indexed: 11/19/2022] Open
Abstract
Electro-magnetic fields are everywhere in our life. The strength and duration of human exposure is proportional to the degree of industrialization. The possible health hazard has been investigated for decades. C. elegans (nematode) has been a sensitive tool to study aging and development. The current study investigated the possible effects of static magnetic fields (SMFs) on the developmental and aging processes of C. elegans. Nematodes were grown in the presence of SMFs of strengths varying from 0 to 200 mT. Treatment with a 200 mT SMF reduced the development times from L2 to young adult by approximately 20%. After SMF treatment, the average lifespan was reduced from 31 days to 25 days for wild-type nematodes. The upregulation of genes associated with development and aging was verified by quantitative real-time RT-PCR. Nematodes carrying mutation in these genes also exhibited resistance to the SMFs treatment. Apparently, induction of gene expression is selective and dose-dependent. SMFs accelerate nematode development and shorten nematode lifespan through pathways associated with let-7, clk-1, unc-3 and age-1.
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Affiliation(s)
- Chia-Hui Lee
- Institute of Nanotechnology; Department of Material Science and Engineering; National Chiao Tung University; Taiwan
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Magnetic nanoparticles as targeted delivery systems in oncology. Radiol Oncol 2011; 45:1-16. [PMID: 22933928 PMCID: PMC3423716 DOI: 10.2478/v10019-011-0001-z] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Accepted: 01/05/2011] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND Many different types of nanoparticles, magnetic nanoparticles being just a category among them, offer exciting opportunities for technologies at the interfaces between chemistry, physics and biology. Some magnetic nanoparticles have already been utilized in clinical practice as contrast enhancing agents for magnetic resonance imaging (MRI). However, their physicochemical properties are constantly being improved upon also for other biological applications, such as magnetically-guided delivery systems for different therapeutics. By exposure of magnetic nanoparticles with attached therapeutics to an external magnetic field with appropriate characteristics, they are concentrated and retained at the preferred site which enables the targeted delivery of therapeutics to the desired spot. CONCLUSIONS The idea of binding chemotherapeutics to magnetic nanoparticles has been around for 30 years, however, no magnetic nanoparticles as delivery systems have yet been approved for clinical practice. Recently, binding of nucleic acids to magnetic nanoparticles has been demonstrated as a successful non-viral transfection method of different cell lines in vitro. With the optimization of this method called magnetofection, it will hopefully become another form of gene delivery for the treatment of cancer.
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Papis E, Davies SJ, Jha AN. Relative sensitivity of fish and mammalian cells to the antibiotic, trimethoprim: cytotoxic and genotoxic responses as determined by neutral red retention, Comet and micronucleus assays. ECOTOXICOLOGY (LONDON, ENGLAND) 2011; 20:208-217. [PMID: 21104197 DOI: 10.1007/s10646-010-0572-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/04/2010] [Indexed: 05/30/2023]
Abstract
Relative cytotoxicity and genotoxicity of a widely used antibiotic, trimethoprim (TRIMP) was evaluated under in vitro conditions using rainbow trout gonad-2 (RTG-2) and Chinese hamster ovary-K1 (CHO-K1) cells. Whilst cytotoxicity was determined using neutral red retention (NRR) assay, the genotoxicity was determined using single cell gel electrophoresis or the Comet assay and cytokinesis-block micronucleus (CBMN) assay. For NRR assay, concentration-dependent cytotoxic effect was observed for both the cell lines (estimated EC(50) values: 671.82 ± 21.78 and 611.6 ± 20.4 μg ml(-1) for RTG-2 and CHO-K1 cells, respectively). There was no statistically significant difference between the two cell lines for this assay. For the Comet assay, standard 6 h exposure to TRIMP did not show any positive response for any of the cell types used. However, 48 h exposure to RTG-2 cells showed a concentration-dependent induction of DNA damage (r = 0.86). The highest concentration of TRIMP used (i.e. 100 μg ml(-1)) showed relatively higher DNA damage, compared to ethyl methane sulfonate (EMS; 1 μg ml(-1) or 8 mM), a reference genotoxic agent, used concurrently. In contrast, 24 h exposure time for CHO-K1 cells did not show any concentration-dependent increase for this assay. For MN assay, a significant correlation was found between the MN induction and TRIMP concentration for both the cell lines (RTG-2: r = 0.68; CHO-K1: r = 0.79), although only the highest concentration used showed a significant increase for binucleated (BN) cell with micronuclei (BNMN). The study suggests that whilst the cells of different origin could exhibit similar cytotoxicity, they could display differential genotoxic effects. Furthermore, genotoxic effects of TRIMP are primarily exposure period dependent phenomena and, in addition to inhibiting the action of dihydrofolate reductase, oxidative stress could also contribute for the observed toxic effects, fish cells in general being more sensitive for genotoxic effects.
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Affiliation(s)
- Elena Papis
- School of Biomedical and Biological Sciences, University of Plymouth, Plymouth, PL4 8AA, UK
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Sullivan K, Balin AK, Allen RG. Effects of static magnetic fields on the growth of various types of human cells. Bioelectromagnetics 2010; 32:140-7. [PMID: 21225891 DOI: 10.1002/bem.20624] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2010] [Accepted: 09/15/2010] [Indexed: 11/05/2022]
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