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Beltran-Huarac J, Yamaleyeva DN, Dotti G, Hingtgen S, Sokolsky-Papkov M, Kabanov AV. Magnetic Control of Protein Expression via Magneto-mechanical Actuation of ND-PEGylated Iron Oxide Nanocubes for Cell Therapy. ACS APPLIED MATERIALS & INTERFACES 2023; 15:19877-19891. [PMID: 37040569 PMCID: PMC10143622 DOI: 10.1021/acsami.3c00179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 04/05/2023] [Indexed: 05/03/2023]
Abstract
Engineered cells used as smart vehicles for delivery of secreted therapeutic proteins enable effective treatment of cancer and certain degenerative, autoimmune, and genetic disorders. However, current cell-based therapies use mostly invasive tools for tracking proteins and do not allow for controlled secretion of therapeutic proteins, which could result in unconstrained killing of surrounding healthy tissues or ineffective killing of host cancer cells. Regulating the expression of therapeutic proteins after success of therapy remains elusive. In this study, a noninvasive therapeutic approach mediated by magneto-mechanical actuation (MMA) was developed to remotely regulate the expression of the tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) protein, which is secreted by transduced cells. Stem cells, macrophages, and breast cancer cells were transduced with a lentiviral vector encoding the SGpL2TR protein. SGpL2TR comprises TRAIL and GpLuc domains optimized for cell-based applications. Our approach relies on the remote actuation of cubic-shape highly magnetic field responsive superparamagnetic iron oxide nanoparticles (SPIONs) coated with nitrodopamine PEG (ND-PEG), which are internalized within the cells. Cubic ND-PEG-SPIONs actuated by superlow frequency alternating current magnetic fields can translate magnetic forces into mechanical motion and in turn spur mechanosensitive cellular responses. Cubic ND-PEG-SPIONs were artificially designed to effectively operate at low magnetic field strengths (<100 mT) retaining approximately 60% of their saturation magnetization. Compared to other cells, stems cells were more sensitive to the interaction with actuated cubic ND-PEG-SPIONs, which clustered near the endoplasmic reticulum (ER). Luciferase, ELISA, and RT-qPCR analyses revealed a marked TRAIL downregulation (secretion levels were depleted down to 30%) when intracellular particles at 0.100 mg/mL Fe were actuated by magnetic fields (65 mT and 50 Hz for 30 min). Western blot studies indicated actuated, intracellular cubic ND-PEG-SPIONs can cause mild ER stress at short periods (up to 3 h) of postmagnetic field treatment thus leading to the unfolded protein response. We observed that the interaction of TRAIL polypeptides with ND-PEG can also contribute to this response. To prove the applicability of our approach, we used glioblastoma cells, which were exposed to TRAIL secreted from stem cells. We demonstrated that in the absence of MMA treatment, TRAIL essentially killed glioblastoma cells indiscriminately, but when treated with MMA, we were able to control the cell killing rate by adjusting the magnetic doses. This approach can expand the capabilities of stem cells to serve as smart vehicles for delivery of therapeutic proteins in a controlled manner without using interfering and expensive drugs, while retaining their potential to regenerate damaged tissue after treatment. This approach brings forth new alternatives to regulate protein expression noninvasively for cell therapy and other cancer therapies.
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Affiliation(s)
- Juan Beltran-Huarac
- Center
for Nanotechnology in Drug Delivery and Division of Pharmacoengineering
and Molecular Therapeutics, Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599, United States
- Department
of Physics, Howell Science Complex, East
Carolina University, Greenville, North Carolina 27858, United States
| | - Dina N. Yamaleyeva
- Joint
UNC/NC State Department of Biomedical Engineering, University of North Carolina, Chapel Hill, North Carolina 27599, United States
| | - Gianpietro Dotti
- Lineberger
Comprehensive Cancer Center and Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, North Carolina 27599, United States
| | - Shawn Hingtgen
- Division
of Pharmacoengineering and Molecular Therapeutics, Eshelman School
of Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599, United States
| | - Marina Sokolsky-Papkov
- Center
for Nanotechnology in Drug Delivery and Division of Pharmacoengineering
and Molecular Therapeutics, Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599, United States
| | - Alexander V. Kabanov
- Center
for Nanotechnology in Drug Delivery and Division of Pharmacoengineering
and Molecular Therapeutics, Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599, United States
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Ronniger M, Aguida B, Stacke C, Chen Y, Ehnert S, Erdmann N, Eschenburg G, Falldorf K, Pooam M, Wing A, Ahmad M. A Novel Method to Achieve Precision and Reproducibility in Exposure Parameters for Low-Frequency Pulsed Magnetic Fields in Human Cell Cultures. Bioengineering (Basel) 2022; 9:bioengineering9100595. [PMID: 36290562 PMCID: PMC9598188 DOI: 10.3390/bioengineering9100595] [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: 08/29/2022] [Revised: 09/30/2022] [Accepted: 09/30/2022] [Indexed: 11/16/2022] Open
Abstract
The effects of extremely low-frequency electromagnetic field (ELF-MF) exposure on living systems have been widely studied at the fundamental level and also claimed as beneficial for the treatment of diseases for over 50 years. However, the underlying mechanisms and cellular targets of ELF-MF exposure remain poorly understood and the field has been plagued with controversy stemming from an endemic lack of reproducibility of published findings. To address this problem, we here demonstrate a technically simple and reproducible EMF exposure protocol to achieve a standardized experimental approach which can be readily adopted in any lab. As an assay system, we chose a commercially available inflammatory model human cell line; its response to magnetic fields involves changes in gene expression which can be monitored by a simple colorimetric reporter gene assay. The cells were seeded and cultured in microplates and inserted into a custom-built, semi-automated incubation and exposure system which accurately controls the incubation (temperature, humidity, CO2) and magnetic-field exposure conditions. A specific alternating magnetic field (<1.0% spatial variance) including far-field reduction provided defined exposure conditions at the position of each well of the microplate. To avoid artifacts, all environmental and magnetic-field exposure parameters were logged in real time throughout the duration of the experiment. Under these extensively controlled conditions, the effect of the magnetic field on the cell cultures as assayed by the standardized operating procedure was highly reproducible between experiments. As we could fully define the characteristics (frequency, intensity, duration) of the pulsed magnetic field signals at the position of the sample well, we were, for the first time, able to accurately determine the effect of changing single ELF-MF parameters such as signal shape, frequency, intensity and duty cycle on the biological response. One signal in particular (10 Hz, 50% duty cycle, rectangular, bipolar, 39.6μT) provided a significant reduction in cytokine reporter gene expression by 37% in our model cell culture line. In sum, the accuracy, environmental control and data-logging capacity of the semi-automated exposure system should greatly facilitate research into fundamental cellular response mechanisms and achieve the consistency necessary to bring ELF-MF/PEMF research results into the scientific mainstream.
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Affiliation(s)
- Michael Ronniger
- Sachtleben GmbH, 20251 Hamburg, Germany
- Correspondence: (M.R.); (M.A.); Tel.: +49-408-060-961-25 (M.R.); +33-014-427-2916 (M.A.)
| | - Blanche Aguida
- Photobiology Research Group, Sorbonne Université CNRS, 75005 Paris, France
| | | | - Yangmengfan Chen
- Department of Biology, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand
| | - Sabrina Ehnert
- Department of Biology, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand
| | | | | | | | - Marootpong Pooam
- Siegfried Weller Institute for Trauma Research, Department of Trauma and Reconstructive Surgery, BG Unfallklinik Tübingen, Eberhard Karls Universität Tübingen, 72076 Tübingen, Germany
| | | | - Margaret Ahmad
- Photobiology Research Group, Sorbonne Université CNRS, 75005 Paris, France
- Correspondence: (M.R.); (M.A.); Tel.: +49-408-060-961-25 (M.R.); +33-014-427-2916 (M.A.)
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3
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Belpomme D, Irigaray P. Why electrohypersensitivity and related symptoms are caused by non-ionizing man-made electromagnetic fields: An overview and medical assessment. ENVIRONMENTAL RESEARCH 2022; 212:113374. [PMID: 35537497 DOI: 10.1016/j.envres.2022.113374] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 03/30/2022] [Accepted: 04/25/2022] [Indexed: 06/14/2023]
Abstract
Much of the controversy over the cause of electrohypersensitivity (EHS) lies in the absence of recognized clinical and biological criteria for a widely accepted diagnosis. However, there are presently sufficient data for EHS to be acknowledged as a distinctly well-defined and objectively characterized neurologic pathological disorder. Because we have shown that 1) EHS is frequently associated with multiple chemical sensitivity (MCS) in EHS patients, and 2) that both individualized disorders share a common pathophysiological mechanism for symptom occurrence; it appears that EHS and MCS can be identified as a unique neurologic syndrome, regardless their causal origin. In this overview we distinguish the etiology of EHS itself from the environmental causes that trigger pathophysiological changes and clinical symptoms after EHS has occurred. Contrary to present scientifically unfounded claims, we indubitably refute the hypothesis of a nocebo effect to explain the genesis of EHS and its presentation. We as well refute the erroneous concept that EHS could be reduced to a vague and unproven "functional impairment". To the contrary, we show here there are objective pathophysiological changes and health effects induced by electromagnetic field (EMF) exposure in EHS patients and most of all in healthy subjects, meaning that excessive non-thermal anthropogenic EMFs are strongly noxious for health. In this overview and medical assessment we focus on the effects of extremely low frequencies, wireless communications radiofrequencies and microwaves EMF. We discuss how to better define and characterize EHS. Taken into consideration the WHO proposed causality criteria, we show that EHS is in fact causally associated with increased exposure to man-made EMF, and in some cases to marketed environmental chemicals. We therefore appeal to all governments and international health institutions, particularly the WHO, to urgently consider the growing EHS-associated pandemic plague, and to acknowledge EHS as a mainly new real EMF causally-related pathology.
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Affiliation(s)
- Dominique Belpomme
- Medical Oncology Department, Paris University, Paris, France; European Cancer and Environment Research Institute (ECERI), Brussels, Belgium.
| | - Philippe Irigaray
- European Cancer and Environment Research Institute (ECERI), Brussels, Belgium
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Panagopoulos DJ, Karabarbounis A, Yakymenko I, Chrousos GP. Human‑made electromagnetic fields: Ion forced‑oscillation and voltage‑gated ion channel dysfunction, oxidative stress and DNA damage (Review). Int J Oncol 2021; 59:92. [PMID: 34617575 PMCID: PMC8562392 DOI: 10.3892/ijo.2021.5272] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 08/23/2021] [Indexed: 12/13/2022] Open
Abstract
Exposure of animals/biological samples to human‑made electromagnetic fields (EMFs), especially in the extremely low frequency (ELF) band, and the microwave/radio frequency (RF) band which is always combined with ELF, may lead to DNA damage. DNA damage is connected with cell death, infertility and other pathologies, including cancer. ELF exposure from high‑voltage power lines and complex RF exposure from wireless communication antennas/devices are linked to increased cancer risk. Almost all human‑made RF EMFs include ELF components in the form of modulation, pulsing and random variability. Thus, in addition to polarization and coherence, the existence of ELFs is a common feature of almost all human‑made EMFs. The present study reviews the DNA damage and related effects induced by human‑made EMFs. The ion forced‑oscillation mechanism for irregular gating of voltage‑gated ion channels on cell membranes by polarized/coherent EMFs is extensively described. Dysfunction of ion channels disrupts intracellular ionic concentrations, which determine the cell's electrochemical balance and homeostasis. The present study shows how this can result in DNA damage through reactive oxygen species/free radical overproduction. Thus, a complete picture is provided of how human‑made EMF exposure may indeed lead to DNA damage and related pathologies, including cancer. Moreover, it is suggested that the non‑thermal biological effects attributed to RF EMFs are actually due to their ELF components.
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Affiliation(s)
- Dimitris J. Panagopoulos
- Laboratory of Health Physics, Radiobiology and Cytogenetics, Institute of Nuclear and Radiological Sciences and Technology, Energy and Safety, National Center for Scientific Research 'Demokritos', 15310 Athens, Greece
- Choremeion Research Laboratory, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
- Electromagnetic Field-Biophysics Research Laboratory, 10681 Athens, Greece
| | - Andreas Karabarbounis
- Department of Physics, Section of Nuclear and Particle Physics, National and Kapodistrian University of Athens, 15784 Athens, Greece
| | - Igor Yakymenko
- Institute of Experimental Pathology, Oncology and Radiobiology of National Academy of Science of Ukraine, 03022 Kyiv, Ukraine
- Department of Public Health, Kyiv Medical University, 02000 Kyiv, Ukraine
| | - George P. Chrousos
- Choremeion Research Laboratory, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
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Kimura T, Inaka K, Ogiso N. Demonstrative Experiment on the Favorable Effects of Static Electric Field Treatment on Vitamin D3-Induced Hypercalcemia. BIOLOGY 2021; 10:biology10111116. [PMID: 34827108 PMCID: PMC8615207 DOI: 10.3390/biology10111116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 10/18/2021] [Accepted: 10/26/2021] [Indexed: 11/20/2022]
Abstract
Simple Summary Static electric field (SEF) treatment by high-voltage alternating current is a traditional complementary medicine in Japan. Although it is believed that the SEF-induced electric current serves to regulate cellular or humoral responses in patients, the mechanism for SEF treatment remains poorly understood. There have been very few experimental reports on the biological action with SEF treatment. The aim of this study was to elucidate the effects of SEF treatment on vitamin D3 (Vit D3)-induced abnormalities in mice. SEF treatment improved the abnormalities in the renal function tests and the imbalance of serum electrolytes. In addition, this treatment remarkably attenuated the Vit D3-induced tissue injuries (severe tissue calcification in the kidneys, hearts, and stomachs). It was likely that the SEF treatment had some favorable effects on the metabolism of calcium. In conclusion, this study provides important evidence that SEF treatment can reduce hypercalcemia and remove calcium deposits from the renal, cardiac, and gastric tissues. SEF treatment is useful in the regulation of disorders caused by an imbalance of serum electrolytes. This study experimentally demonstrates the favorable effects of SEF treatment on Vit D3-induced hypercalcemia. For small animals, the larger the body surface area per body weight becomes, the higher the therapeutic efficacy with SEF treatment. Abstract The purpose of this study was to elucidate the effects of static electric field (SEF) treatment on vitamin D3 (Vit D3)-induced hypercalcemia and renal calcification in mice. The mice were assigned to three groups: Vit D3-treated mice, mice treated with Vit D3 and SEF (Vit D3 + SEF), and untreated mice. After the administration of Vit D3, the Vit D3 + SEF-treated mice were exposed to SEF treatment by a high-voltage alternating current over five days. Serum biochemical examinations revealed that both the creatinine and blood urea nitrogen concentrations were significantly higher in the Vit D3-treated group. Significantly, decreased Cl concentrations, and increased Ca and inorganic phosphorus concentrations, were found in the Vit D3-treated group. In the Vit D3 + SEF-treated group, these parameters returned to the levels of the untreated group. In the Vit D3-treated group, histopathological examinations showed marked multifocal calcification in the lumens of the renal tubules and the renal parenchyma. The myocardium was replaced by abundant granular mineralization (calcification), with degeneration and necrosis of the calcified fibers. The stomach showed calcification of the cardiac mucosa. SEF treatment remarkably attenuated the Vit D3-induced hypervitaminotic injuries. In conclusion, this study provides important evidence that SEF treatment can reduce hypercalcemia and remove calcium deposits from the renal, cardiac, and gastric tissues. SEF treatment is useful in the regulation of disorders caused by an imbalance of serum electrolytes.
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Affiliation(s)
- Tohru Kimura
- Laboratory Animal Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi City 753-8515, Japan;
- Correspondence: ; Tel.: +81-83-933-5877
| | - Kengo Inaka
- Laboratory Animal Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi City 753-8515, Japan;
| | - Noboru Ogiso
- National Center for Geratrics Gerontology, National Institute for Longevity Sciences, Obu City 474-8511, Japan;
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Manjua AC, Cabral JMS, Ferreira FC, Portugal CAM. Magnetic Field Dynamic Strategies for the Improved Control of the Angiogenic Effect of Mesenchymal Stromal Cells. Polymers (Basel) 2021; 13:1883. [PMID: 34204049 PMCID: PMC8201388 DOI: 10.3390/polym13111883] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2021] [Revised: 05/26/2021] [Accepted: 05/31/2021] [Indexed: 01/01/2023] Open
Abstract
This work shows the ability to remotely control the paracrine performance of mesenchymal stromal cells (MSCs) in producing an angiogenesis key molecule, vascular endothelial growth factor (VEGF-A), by modulation of an external magnetic field. This work compares for the first time the application of static and dynamic magnetic fields in angiogenesis in vitro model, exploring the effect of magnetic field intensity and dynamic regimes on the VEGF-A secretion potential of MSCs. Tissue scaffolds of gelatin doped with iron oxide nanoparticles (MNPs) were used as a platform for MSC proliferation. Dynamic magnetic field regimes were imposed by cyclic variation of the magnetic field intensity in different frequencies. The effect of the magnetic field intensity on cell behavior showed that higher intensity of 0.45 T was associated with increased cell death and a poor angiogenic effect. It was observed that static and dynamic magnetic stimulation with higher frequencies led to improved angiogenic performance on endothelial cells in comparison with a lower frequency regime. This work showed the possibility to control VEGF-A secretion by MSCs through modulation of the magnetic field, offering attractive perspectives of a non-invasive therapeutic option for several diseases by revascularizing damaged tissues or inhibiting metastasis formation during cancer progression.
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Affiliation(s)
- Ana C. Manjua
- LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade Nova de Lisboa, Campus da Caparica, 2829-516 Caparica, Portugal;
- Department of Bioengineering and iBB—Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;
| | - Joaquim M. S. Cabral
- Department of Bioengineering and iBB—Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;
- Associate Laboratory i4HB—Institute for Health and Bioeconomy, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
| | - Frederico Castelo Ferreira
- Department of Bioengineering and iBB—Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;
- Associate Laboratory i4HB—Institute for Health and Bioeconomy, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
| | - Carla A. M. Portugal
- LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade Nova de Lisboa, Campus da Caparica, 2829-516 Caparica, Portugal;
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Ozdemir E, Demirkazik A, Taskıran AS, Arslan G. Effects of 5-HT 1 and 5-HT 2 Receptor Agonists on Electromagnetic Field-Induced Analgesia in Rats. Bioelectromagnetics 2019; 40:319-330. [PMID: 31152464 DOI: 10.1002/bem.22196] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 04/26/2019] [Indexed: 11/10/2022]
Abstract
Much evidence demonstrates the antinociceptive effect of magnetic fields (MFs). However, the analgesic action mechanism of the electromagnetic field (EMF) is not exactly understood. The aim of the present study was to investigate the effects of 5-HT1 and 5-HT2 receptor agonists (serotonin HCl and 2,5-dimethoxy-4-iodoamphetamine [DOI] hydrochloride) on EMF-induced analgesia. In total, 66 adult male Wistar albino rats with an average body mass of 225 ± 13 g were used in this study. The animals were subjected to repeated exposures of alternating 50 Hz and 5 mT EMF for 2 h a day for 15 days. Prior to analgesia tests, serotonin HCl (5-HT1 agonist) 4 mg/kg, WAY 100635 (5-HT1 antagonist) 0.04 mg/kg, DOI hydrochloride (5-HT2 receptor agonist) 4 mg/kg, and SB 204741 (5-HT2 antagonist) 0.5 mg/kg doses were injected into rats. For statistical analysis of the data, analysis of variance was used and multiple comparisons were determined by Tukey's test. Administration of serotonin HCl MF (5 mT)-exposed rats produced a significant increase in percent maximal possible effect (% MPE) as compared with EMF group (P < 0.05). On the contrary, injection of WAY 100635 to MF-exposed rats produced a significant decrease in analgesic activity (P < 0.05). Similarly, the administration of DOI hydrochloride significantly increased % MPE values as compared with the EMF group while SB 204741 reduced it (P < 0.05). In conclusion, our results suggested that serotonin 5-HT1 and 5-HT2 receptors play an important role in EMF-induced analgesia; however, further research studies are necessary to understand the mechanism. Bioelectromagnetics. 2019;40:319-330. © 2019 Bioelectromagnetics Society.
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Affiliation(s)
- Ercan Ozdemir
- Departments of Physiology, School of Medicine, Cumhuriyet University, Sivas, Turkey
| | - Ayse Demirkazik
- Departments of Biophysics, School of Medicine, Cumhuriyet University, Sivas, Turkey
| | - Ahmet Sevki Taskıran
- Departments of Physiology, School of Medicine, Cumhuriyet University, Sivas, Turkey
| | - Gokhan Arslan
- Departments of Physiology, School of Medicine, Ondokuz Mayıs University, Samsun, Turkey
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Comparative Analysis of Biological Effects Induced on Different Cell Types by Magnetic Fields with Magnetic Flux Densities in the Range of 1–60 mT and Frequencies up to 50 Hz. SUSTAINABILITY 2018. [DOI: 10.3390/su10082776] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Moderate static magnetic fields (SMFs) are generated from sources such as new-generation electric trams and trains, electric arc welding, and magnetic resonance imaging (MRI) devices, as well as during the industrial production of aluminium, while extremely low frequency pulsed magnetic fields (ELF-PMFs) are produced by house power installations, household appliances, and high voltages transmission lines. Moderate SMFs and ELF-PMFs with magnetic flux densities (B) in the range of 1–60 mT and frequencies (f) up to 50 Hz are common MF exposure sources for the population. Even though humans are continually exposed to these MFs, to date no definitive endpoint has been drawn about their safety. In this review, the state of knowledge about the biological effects induced by these MFs on different cell types will be addressed. In our own observation, the putative modulation of Ca2+/H+ and Na+/H+ plasma membrane antiporters of human peripheral blood lymphocytes (PBLs) was found to occur after a 24 h exposure to a 6 mT SMF, and the bystander effect observed on U937 cells cultivated for up to 6 h in the conditioned medium harvested from human PBLs previously exposed for 24 h to the same MF (secondary necrosis induction) will be also herein discussed.
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Doyon P, Johansson O. Electromagnetic fields may act via calcineurin inhibition to suppress immunity, thereby increasing risk for opportunistic infection: Conceivable mechanisms of action. Med Hypotheses 2017; 106:71-87. [DOI: 10.1016/j.mehy.2017.06.028] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 06/25/2017] [Accepted: 06/30/2017] [Indexed: 11/26/2022]
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10
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Kim KE, Park SK, Nam SY, Han TJ, Cho IY. Potential therapeutic mechanism of extremely low-frequency high-voltage electric fields in cells. Technol Health Care 2017; 24:415-27. [PMID: 26684400 DOI: 10.3233/thc-151119] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The aim of this survey was to provide background theory based on previous research to elucidate the potential pathway by which medical devices using extremely low-frequency high-voltage electric fields (ELF-HVEF) exert therapeutic effects on the human body, and to increase understanding of the AC high-voltage electrotherapeutic apparatus for consumers and suppliers of the relevant devices. Our review revealed that an ELF field as weak as 1-10 μ V/m can induce diverse alterations of membrane proteins such as transporters and channel proteins, including changes in Ca + + binding to a specific site of the cell surface, changes in ion (e.g., Ca + + ) influx or efflux, and alterations in the ligand-receptor interaction. These alterations then induce cytoplasmic responses within cells (Ca + + , cAMP, kinases, etc.) that can have impacts on cell growth, differentiation, and other functional properties by promoting the synthesis of macromolecules. Moreover, increased cytoplasmic Ca + + involves calmodulin-dependent signaling and consequent Ca + + /calmodulin-dependent stimulation of nitric oxide synthesis. This event in turn induces the nitric oxide-cGMP-protein kinase G pathway, which may be an essential factor in the observed physiological and therapeutic responses.
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Madjid Ansari A, Majidzadeh-A K, Darvishi B, Sanati H, Farahmand L, Norouzian D. Extremely low frequency magnetic field enhances glucose oxidase expression in Pichia pastoris GS115. Enzyme Microb Technol 2017; 98:67-75. [DOI: 10.1016/j.enzmictec.2016.12.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2016] [Revised: 12/31/2016] [Accepted: 12/31/2016] [Indexed: 01/26/2023]
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12
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Golbach LA, Portelli LA, Savelkoul HFJ, Terwel SR, Kuster N, de Vries RBM, Verburg-van Kemenade BML. Calcium homeostasis and low-frequency magnetic and electric field exposure: A systematic review and meta-analysis of in vitro studies. ENVIRONMENT INTERNATIONAL 2016; 92-93:695-706. [PMID: 26872872 DOI: 10.1016/j.envint.2016.01.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 12/10/2015] [Accepted: 01/18/2016] [Indexed: 05/24/2023]
Abstract
Low frequency magnetic field (LF MF) exposure is recurrently suggested to have the ability to induce health effects in society. Therefore, in vitro model systems are used to investigate biological effects of exposure. LF MF induced changes of the cellular calcium homeostasis are frequently hypothesised to be the possible target, but this hypothesis is both substantiated and rejected by numerous studies in literature. Despite the large amount of data, no systematic analysis of in vitro studies has been conducted to address the strength of evidence for an association between LF MF exposure and calcium homeostasis. Our systematic review, with inclusion of 42 studies, showed evidence for an association of LF MF with internal calcium concentrations and calcium oscillation patterns. The oscillation frequency increased, while the amplitude and the percentage of oscillating cells remained constant. The intracellular calcium concentration increased (SMD 0.351, 95% CI 0.126, 0.576). Subgroup analysis revealed heterogeneous effects associated with the exposure frequency, magnetic flux density and duration. Moreover, we found support for the presence of MF-sensitive cell types. Nevertheless, some of the included studies may introduce a great risk of bias as a result of uncontrolled or not reported exposure conditions, temperature ranges and ambient fields. In addition, mathematical calculations of the parasitic induced electric fields (IEFs) disclosed their association with increased intracellular calcium. Our results demonstrate that LF MF might influence the calcium homeostasis in cells in vitro, but the risk of bias and high heterogeneity (I(2)>75%) weakens the analyses. Therefore any potential clinical implications await further investigation.
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Affiliation(s)
- Lieke A Golbach
- Cell Biology and Immunology Group, Wageningen University, P.O.Box 338, 6700AH Wageningen, The Netherlands
| | - Lucas A Portelli
- The Foundation for Research on Information Technologies in Society (IT'IS), Zeughausstrasse 43, CH-8004 Zurich, Switzerland
| | - Huub F J Savelkoul
- Cell Biology and Immunology Group, Wageningen University, P.O.Box 338, 6700AH Wageningen, The Netherlands
| | - Sofie R Terwel
- Cell Biology and Immunology Group, Wageningen University, P.O.Box 338, 6700AH Wageningen, The Netherlands
| | - Niels Kuster
- The Foundation for Research on Information Technologies in Society (IT'IS), Zeughausstrasse 43, CH-8004 Zurich, Switzerland; Department of Information Technology and Electrical Engineering, Swiss Federal Technical Institute (ETHZ), Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Rob B M de Vries
- SYRCLE, Central Animal Laboratory, Radboud University Medical Center, The Netherlands
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Suarez Castellanos IM, Balteanu B, Singh T, Zderic V. Therapeutic Modulation of Calcium Dynamics Using Ultrasound and Other Energy-Based Techniques. IEEE Rev Biomed Eng 2016; 9:177-191. [DOI: 10.1109/rbme.2016.2555760] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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14
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Liu Y, Liu WB, Liu KJ, Ao L, Zhong JL, Cao J, Liu JY. Effect of 50 Hz Extremely Low-Frequency Electromagnetic Fields on the DNA Methylation and DNA Methyltransferases in Mouse Spermatocyte-Derived Cell Line GC-2. BIOMED RESEARCH INTERNATIONAL 2015; 2015:237183. [PMID: 26339596 PMCID: PMC4538330 DOI: 10.1155/2015/237183] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Accepted: 04/01/2015] [Indexed: 12/11/2022]
Abstract
Previous studies have shown that the male reproductive system is one of the most sensitive organs to electromagnetic radiation. However, the biological effects and molecular mechanism are largely unclear. Our study was designed to elucidate the epigenetic effects of 50 Hz ELF-EMF in vitro. Mouse spermatocyte-derived GC-2 cell line was exposed to 50 Hz ELF-EMF (5 min on and 10 min off) at magnetic field intensity of 1 mT, 2 mT, and 3 mT with an intermittent exposure for 72 h. We found that 50 Hz ELF-EMF exposure decreased genome-wide methylation at 1 mT, but global methylation was higher at 3 mT compared with the controls. The expression of DNMT1 and DNMT3b was decreased at 1 mT, and 50 Hz ELF-EMF can increase the expression of DNMT1 and DNMT3b of GC-2 cells at 3 mT. However, 50 Hz ELF-EMF had little influence on the expression of DNMT3a. Then, we established DNA methylation and gene expression profiling and validated some genes with aberrant DNA methylation and expression at different intensity of 50 Hz ELF-EMF. These results suggest that the alterations of genome-wide methylation and DNMTs expression may play an important role in the biological effects of 50 Hz ELF-EMF exposure.
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Affiliation(s)
- Yong Liu
- College of Bioengineering, Chongqing University, Chongqing 400044, China
- Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China
| | - Wen-bin Liu
- Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China
| | - Kai-jun Liu
- Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China
| | - Lin Ao
- Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China
| | - Julia Li Zhong
- College of Bioengineering, Chongqing University, Chongqing 400044, China
| | - Jia Cao
- Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China
| | - Jin-yi Liu
- Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China
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16
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Brady MA, Waldman SD, Ethier CR. The application of multiple biophysical cues to engineer functional neocartilage for treatment of osteoarthritis. Part II: signal transduction. TISSUE ENGINEERING PART B-REVIEWS 2014; 21:20-33. [PMID: 25065615 DOI: 10.1089/ten.teb.2013.0760] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The unique mechanoelectrochemical environment of cartilage has motivated researchers to investigate the effect of multiple biophysical cues, including mechanical, magnetic, and electrical stimulation, on chondrocyte biology. It is well established that biophysical stimuli promote chondrocyte proliferation, differentiation, and maturation within "biological windows" of defined dose parameters, including mode, frequency, magnitude, and duration of stimuli (see companion review Part I: Cellular Response). However, the underlying molecular mechanisms and signal transduction pathways activated in response to multiple biophysical stimuli remain to be elucidated. Understanding the mechanisms of biophysical signal transduction will deepen knowledge of tissue organogenesis, remodeling, and regeneration and aiding in the treatment of pathologies such as osteoarthritis. Further, this knowledge will provide the tissue engineer with a potent toolset to manipulate and control cell fate and subsequently develop functional replacement cartilage. The aim of this article is to review chondrocyte signal transduction pathways in response to mechanical, magnetic, and electrical cues. Signal transduction does not occur along a single pathway; rather a number of parallel pathways appear to be activated, with calcium signaling apparently common to all three types of stimuli, though there are different modes of activation. Current tissue engineering strategies, such as the development of "smart" functionalized biomaterials that enable the delivery of growth factors or integration of conjugated nanoparticles, may further benefit from targeting known signal transduction pathways in combination with external biophysical cues.
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Affiliation(s)
- Mariea A Brady
- 1 Department of Bioengineering, Imperial College London , London, United Kingdom
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17
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Aida L, Soumaya G, Myriam E, Mohsen S, Hafedh A. Effects of static magnetic field exposure on plasma element levels in rat. Biol Trace Elem Res 2014; 160:67-72. [PMID: 24894831 DOI: 10.1007/s12011-014-9987-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Accepted: 04/16/2014] [Indexed: 11/24/2022]
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. SMF influenced cellular antioxidant defense mechanisms by affecting antioxidant enzymes such as superoxide dismutase (SOD), glutathione peroxidase (GPx), and catalase (CAT). However, there were insufficient reports about the effects of SMF on macro and trace elements in serum, and the results were contradictory until now. In the current study, 12 rats were divided into two groups, namely as control and exposure group (128 mT and 1 h/day during five consecutive days). The macro and trace element concentrations in serum were examined. No significant difference was observed in the sodium (Na), potassium (K), calcium (Ca), phosphorus (P), and selenium (Se) levels in rat compared to control. By contrast, exposure to SMF showed an increase in the zinc (Zn) level and a decrease in iron (Fe) concentration. Under our experimental conditions, SMF exposure cannot affect the plasma levels of macroelements, while it can disrupt Zn and Fe concentrations in rat.
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Affiliation(s)
- Lahbib Aida
- Laboratory of Integrative Physiology, Faculty of Sciences of Bizerte, Carthage University, 7021, Jarzouna, Tunisia,
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Dimitrijević D, Savić T, Anđelković M, Prolić Z, Janać B. Extremely low frequency magnetic field (50 Hz, 0.5 mT) modifies fitness components and locomotor activity ofDrosophila subobscura. Int J Radiat Biol 2014; 90:337-43. [DOI: 10.3109/09553002.2014.888105] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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19
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Bekhite MM, Figulla HR, Sauer H, Wartenberg M. Static magnetic fields increase cardiomyocyte differentiation of Flk-1+ cells derived from mouse embryonic stem cells via Ca2+ influx and ROS production. Int J Cardiol 2013; 167:798-808. [DOI: 10.1016/j.ijcard.2012.02.020] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2011] [Revised: 01/16/2012] [Accepted: 02/26/2012] [Indexed: 11/16/2022]
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20
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Bertolino G, Dutra Souza HC, de Araujo JE. Neuropathology and behavioral impairments in Wistar rats with a 6-OHDA lesion in the substantia nigra compacta and exposure to a static magnetic field. Electromagn Biol Med 2013; 32:527-35. [DOI: 10.3109/15368378.2012.751394] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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21
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Bertolino G, De Araujo FLB, Souza HCD, Coimbra NC, De Araujo JE. Neuropathology and behavioral impairments after bilateral global ischemia surgery and exposure to static magnetic field: Evidence in the motor cortex, the hippocampal CA1 region and the neostriatum. Int J Radiat Biol 2013; 89:595-601. [DOI: 10.3109/09553002.2013.784422] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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22
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ELF Alternating Magnetic Field Decreases Reproduction by DNA Damage Induction. Cell Biochem Biophys 2013; 67:703-16. [DOI: 10.1007/s12013-013-9560-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Foletti A, Grimaldi S, Lisi A, Ledda M, Liboff AR. Bioelectromagnetic medicine: the role of resonance signaling. Electromagn Biol Med 2013; 32:484-99. [PMID: 23323834 DOI: 10.3109/15368378.2012.743908] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Only recently has the critical importance of electromagnetic (EM) field interactions in biology and medicine been recognized. We review the phenomenon of resonance signaling, discussing how specific frequencies modulate cellular function to restore or maintain health. The application of EM-tuned signals represents more than merely a new tool in information medicine. It can also be viewed in the larger context of EM medicine, the all-encompassing view that elevates the EM over the biochemical. The discovery by Zhadin that ultrasmall magnetic intensities are biologically significant suggests that EM signaling is endogenous to cell regulation, and consequently that the remarkable effectiveness of EM resonance treatments reflects a fundamental aspect of biological systems. The concept that organisms contain mechanisms for generating biologically useful electric signals is not new, dating back to the nineteenth century discovery of currents of injury by Matteucci. The corresponding modern-day version is that ion cyclotron resonance magnetic field combinations help regulate biological information. The next advance in medicine will be to discern and apply those EM signaling parameters acting to promote wellness, with decreasing reliance on marginal biochemical remediation and pharmaceuticals.
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Affiliation(s)
- Alberto Foletti
- Institute of Translational Pharmacology - CNR , Rome , Italy
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De Carlo F, Ledda M, Pozzi D, Pierimarchi P, Zonfrillo M, Giuliani L, D'Emilia E, Foletti A, Scorretti R, Grimaldi S, Lisi A. Nonionizing Radiation as a Noninvasive Strategy in Regenerative Medicine: The Effect of Ca2+-ICR on Mouse Skeletal Muscle Cell Growth and Differentiation. Tissue Eng Part A 2012; 18:2248-58. [DOI: 10.1089/ten.tea.2012.0113] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Flavia De Carlo
- Institute of Translational Pharmacology, National Research Council, Rome, Italy
| | - Mario Ledda
- Institute of Translational Pharmacology, National Research Council, Rome, Italy
| | - Deleana Pozzi
- Department of Experimental Medicine, University of Rome “La Sapienza,” Regina Elena, Italy
| | | | - Manuela Zonfrillo
- Institute of Translational Pharmacology, National Research Council, Rome, Italy
| | - Livio Giuliani
- Instituto Superiore per la, Prevenzionie e Sicurezza sul Lavoro, Dipartimento Installazioni de Prodozione e Insediamenti Antropici (ISPESL-DIPIA), Rome, Italy
| | - Enrico D'Emilia
- Instituto Superiore per la, Prevenzionie e Sicurezza sul Lavoro, Dipartimento Installazioni de Prodozione e Insediamenti Antropici (ISPESL-DIPIA), Rome, Italy
| | - Alberto Foletti
- Institute of Translational Pharmacology, National Research Council, Rome, Italy
| | - Riccardo Scorretti
- Ampère-Lab-UMR 5005 Centre National de la Recherche Scientifique, University of Lyon, Villeurbanne, France
| | - Settimio Grimaldi
- Institute of Translational Pharmacology, National Research Council, Rome, Italy
| | - Antonella Lisi
- Institute of Translational Pharmacology, National Research Council, Rome, Italy
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Tomás G, Barba E, Merino S, Martínez J. Clutch size and egg volume in great tits (Parus major) increase under low intensity electromagnetic fields: a long-term field study. ENVIRONMENTAL RESEARCH 2012; 118:40-46. [PMID: 22863551 DOI: 10.1016/j.envres.2012.07.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Revised: 12/19/2011] [Accepted: 07/11/2012] [Indexed: 06/01/2023]
Abstract
Exposure to electromagnetic fields (EMFs) can affect a wide range of biological processes, including reproduction, growth and development. Experiments aimed at investigating the biological effects of EMFs, focused on potential harmful effects on humans, have been mostly carried out in vitro or with animal models in laboratory conditions. By contrast, studies performed on wild animals are scarce. The effects of EMFs created by an electric power line on reproductive traits of a wild great tit (Parus major) population were explored by analysing data gathered during nine breeding seasons. EMF exposure significantly increased clutch size (7%) and egg volume (3%), implying a 10% increase in clutch volume. This indicates an increase in reproductive investment from parent birds exposed to EMFs as compared to the adjacent reference area. These results cannot be attributed to habitat or adult quality differences between the exposed and reference group. Nevertheless, no differences in hatching success or final productivity (fledging and reproductive success or nestling body mass) could be detected. Our study clearly shows that EMFs created by power lines can have biological consequences in wild organisms that live intimately with them. To our knowledge, this is the first study showing an increase in clutch size, and one of the few reporting an increase in egg size, associated with EMF exposure. The possible mechanisms by which great tits invest more under EMF exposure are discussed, and future research directions to evaluate the effect of EMFs on avian reproduction in the wild are suggested.
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Affiliation(s)
- Gustavo Tomás
- Department of Evolutionary Ecology, Museo Nacional de Ciencias Naturales (CSIC), Madrid, Spain.
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26
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Sherafat MA, Heibatollahi M, Mongabadi S, Moradi F, Javan M, Ahmadiani A. Electromagnetic field stimulation potentiates endogenous myelin repair by recruiting subventricular neural stem cells in an experimental model of white matter demyelination. J Mol Neurosci 2012; 48:144-53. [PMID: 22588976 DOI: 10.1007/s12031-012-9791-8] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2011] [Accepted: 04/26/2012] [Indexed: 04/28/2023]
Abstract
Electromagnetic fields (EMFs) may affect the endogenous neural stem cells within the brain. The aim of this study was to assess the effects of EMFs on the process of toxin-induced demyelination and subsequent remyelination. Demyelination was induced using local injection of lysophosphatidylcholine within the corpus callosum of adult female Sprague-Dawley rats. EMFs (60 Hz; 0.7 mT) were applied for 2 h twice a day for 7, 14, or 28 days postlesion. BrdU labeling and immunostaining against nestin, myelin basic protein (MBP), and BrdU were used for assessing the amount of neural stem cells within the tissue, remyelination patterns, and tracing of proliferating cells, respectively. EMFs significantly reduced the extent of demyelinated area and increased the level of MBP staining within the lesion area on days 14 and 28 postlesion. EMFs also increased the number of BrdU- and nestin-positive cells within the area between SVZ and lesion as observed on days 7 and 14 postlesion. It seems that EMF potentiates proliferation and migration of neural stem cells and enhances the repair of myelin in the context of demyelinating conditions.
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Affiliation(s)
- Mohammad Amin Sherafat
- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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27
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Gye MC, Park CJ. Effect of electromagnetic field exposure on the reproductive system. Clin Exp Reprod Med 2012; 39:1-9. [PMID: 22563544 PMCID: PMC3341445 DOI: 10.5653/cerm.2012.39.1.1] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Revised: 03/08/2012] [Accepted: 03/15/2012] [Indexed: 01/15/2023] Open
Abstract
The safety of human exposure to an ever-increasing number and diversity of electromagnetic field (EMF) sources both at work and at home has become a public health issue. To date, many in vivo and in vitro studies have revealed that EMF exposure can alter cellular homeostasis, endocrine function, reproductive function, and fetal development in animal systems. Reproductive parameters reported to be altered by EMF exposure include male germ cell death, the estrous cycle, reproductive endocrine hormones, reproductive organ weights, sperm motility, early embryonic development, and pregnancy success. At the cellular level, an increase in free radicals and [Ca2+]i may mediate the effect of EMFs and lead to cell growth inhibition, protein misfolding, and DNA breaks. The effect of EMF exposure on reproductive function differs according to frequency and wave, strength (energy), and duration of exposure. In the present review, the effects of EMFs on reproductive function are summarized according to the types of EMF, wave type, strength, and duration of exposure at cellular and organism levels.
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Affiliation(s)
- Myung Chan Gye
- Department of Life Science and Institute for Natural Sciences, Hanyang University, Seoul, Korea
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28
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Lahijani MS, Bigdeli MR, Kalantary S. Effects of sinusoidal electromagnetic fields on histopathology and structures of brains of preincubated white leghorn chicken embryos. Electromagn Biol Med 2011; 30:146-57. [DOI: 10.3109/15368378.2011.596250] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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29
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Cerella C, Cordisco S, Albertini MC, Accorsi A, Diederich M, Ghibelli L. Magnetic fields promote a pro-survival non-capacitative Ca2+ entry via phospholipase C signaling. Int J Biochem Cell Biol 2010; 43:393-400. [PMID: 21095240 DOI: 10.1016/j.biocel.2010.11.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Revised: 11/04/2010] [Accepted: 11/15/2010] [Indexed: 11/28/2022]
Abstract
The ability of magnetic fields (MFs) to promote/increase Ca(2+) influx into cells is widely recognized, but the underlying mechanisms remain obscure. Here we analyze how static MFs of 6 mT modulates thapsigargin-induced Ca(2+) movements in non-excitable U937 monocytes, and how this relates to the anti-apoptotic effect of MFs. Magnetic fields do not affect thapsigargin-induced Ca(2+) mobilization from endoplasmic reticulum, but significantly increase the resulting Ca(2+) influx; this increase requires intracellular signal transduction actors including G protein, phospholipase C, diacylglycerol lipase and nitric oxide synthase, and behaves as a non-capacitative Ca(2+) entry (NCCE), a type of influx with an inherent signaling function, rather than a capacitative Ca(2+) entry (CCE). All treatments abrogating the extra Ca(2+) influx also abrogate the anti-apoptotic effect of MFs, demonstrating that MF-induced NCCE elicits an anti-apoptotic survival pathway.
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Affiliation(s)
- Claudia Cerella
- Dipartimento di Biologia, Universita' degli Studi di Roma Tor Vergata, Via della Ricerca Scientifica snc, 00133 Roma, Italy
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O'Connor RP, Madison SD, Leveque P, Roderick HL, Bootman MD. Exposure to GSM RF fields does not affect calcium homeostasis in human endothelial cells, rat pheocromocytoma cells or rat hippocampal neurons. PLoS One 2010; 5:e11828. [PMID: 20676401 PMCID: PMC2910734 DOI: 10.1371/journal.pone.0011828] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2010] [Accepted: 05/21/2010] [Indexed: 11/25/2022] Open
Abstract
In the course of modern daily life, individuals are exposed to numerous sources of electromagnetic radiation that are not present in the natural environment. The strength of the electromagnetic fields from sources such as hairdryers, computer display units and other electrical devices is modest. However, in many home and office environments, individuals can experience perpetual exposure to an “electromagnetic smog”, with occasional peaks of relatively high electromagnetic field intensity. This has led to concerns that such radiation can affect health. In particular, emissions from mobile phones or mobile phone masts have been invoked as a potential source of pathological electromagnetic radiation. Previous reports have suggested that cellular calcium (Ca2+) homeostasis is affected by the types of radiofrequency fields emitted by mobile phones. In the present study, we used a high-throughput imaging platform to monitor putative changes in cellular Ca2+ during exposure of cells to 900 MHz GSM fields of differing power (specific absorption rate 0.012–2 W/Kg), thus mimicking the type of radiation emitted by current mobile phone handsets. Data from cells experiencing the 900 Mhz GSM fields were compared with data obtained from paired experiments using continuous wave fields or no field. We employed three cell types (human endothelial cells, PC-12 neuroblastoma and primary hippocampal neurons) that have previously been suggested to be sensitive to radiofrequency fields. Experiments were designed to examine putative effects of radiofrequency fields on resting Ca2+, in addition to Ca2+ signals evoked by an InsP3-generating agonist. Furthermore, we examined putative effects of radiofrequency field exposure on Ca2+ store emptying and store-operated Ca2+ entry following application of the Ca2+ATPase inhibitor thapsigargin. Multiple parameters (e.g., peak amplitude, integrated Ca2+ signal, recovery rates) were analysed to explore potential impact of radiofrequency field exposure on Ca2+ signals. Our data indicate that 900 MHz GSM fields do not affect either basal Ca2+ homeostasis or provoked Ca2+ signals. Even at the highest field strengths applied, which exceed typical phone exposure levels, we did not observe any changes in cellular Ca2+ signals. We conclude that under the conditions employed in our experiments, and using a highly-sensitive assay, we could not detect any consequence of RF exposure.
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Affiliation(s)
- Rodney P. O'Connor
- Laboratory of Molecular Signalling, The Babraham Institute, Cambridge, United Kingdom
| | - Steve D. Madison
- Laboratory of Molecular Signalling, The Babraham Institute, Cambridge, United Kingdom
| | | | - H. Llewelyn Roderick
- Laboratory of Molecular Signalling, The Babraham Institute, Cambridge, United Kingdom
- Department of Pharmacology, University of Cambridge, Cambridge, United Kingdom
| | - Martin D. Bootman
- Laboratory of Molecular Signalling, The Babraham Institute, Cambridge, United Kingdom
- * E-mail:
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Lange K. Fundamental role of microvilli in the main functions of differentiated cells: Outline of an universal regulating and signaling system at the cell periphery. J Cell Physiol 2010; 226:896-927. [PMID: 20607764 DOI: 10.1002/jcp.22302] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Zhang X, Liu X, Pan L, Lee I. Magnetic fields at extremely low-frequency (50Hz, 0.8mT) can induce the uptake of intracellular calcium levels in osteoblasts. Biochem Biophys Res Commun 2010; 396:662-6. [DOI: 10.1016/j.bbrc.2010.04.154] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2010] [Accepted: 04/28/2010] [Indexed: 11/24/2022]
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Kovacic P, Somanathan R. Electromagnetic fields: mechanism, cell signaling, other bioprocesses, toxicity, radicals, antioxidants and beneficial effects. J Recept Signal Transduct Res 2010; 30:214-26. [DOI: 10.3109/10799893.2010.488650] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Paksy K, Thuróczy G, Forgács Z, Lázár P, Gaáti I. INFLUENCE OF SINUSOIDAL 50-HZ MAGNETIC FIELD ON CULTURED HUMAN OVARIAN GRANULOSA CELLS. ACTA ACUST UNITED AC 2009. [DOI: 10.1081/jbc-100100299] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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35
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Lisi A, Ledda M, De Carlo F, Foletti A, Giuliani L, D'Emilia E, Grimaldi S. Calcium Ion Cyclotron Resonance (ICR) Transfers Information to Living Systems: Effects on Human Epithelial Cell Differentiation. Electromagn Biol Med 2009; 27:230-40. [DOI: 10.1080/15368370802269135] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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36
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37
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Foletti A, Lisi A, Ledda M, de Carlo F, Grimaldi S. Cellular ELF Signals as a Possible Tool in Informative Medicine. Electromagn Biol Med 2009; 28:71-9. [DOI: 10.1080/15368370802708801] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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38
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Sun WJ, Chiang H, Fu YT, Yu YN, Xie HY, Lu DQ. EXPOSURE TO 50 HZ ELECTROMAGNETIC FIELDS INDUCES THE PHOSPHORYLATION AND ACTIVITY OF STRESS-ACTIVATED PROTEIN KINASE IN CULTURED CELLS. ACTA ACUST UNITED AC 2009. [DOI: 10.1081/jbc-100108579] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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39
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Ahuja YR, Bhargava SC, Ratnakar KS. Electric and Magnetic Fields in Stem Cell Research. Electromagn Biol Med 2009. [DOI: 10.1080/15368370500205480] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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40
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Lisi A, Foletti A, Ledda M, Rosola E, Giuliani L, D'Emilia E, Grimaldi S. Extremely Low Frequency 7 Hz 100 µT Electromagnetic Radiation Promotes Differentiation in the Human Epithelial Cell Line HaCaT. Electromagn Biol Med 2009; 25:269-80. [PMID: 17178586 DOI: 10.1080/15368370601044184] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Electromagnetic therapy is a treatment method in which an electromagnetic or magnetic stimulus is used to achieve physiological changes in the body. The specific aim of the present work concerns the effectiveness of low frequency electromagnetic fields to modify the biochemical properties of human keratinocytes (HaCaT). Cells exposed to a 7 Hz 100 microT electromagnetic field for one hour (twice daily), indicated modification in shape and morphology. These modifications were also associated with different actin distribution as revealed by phalloidin fluorescence analysis. Indirect immunofluorescence with fluorescent antibodies against involucrin and beta-Catenin, both differentiation and adhesion markers, revealed an increase in involucrin and beta-Catenin expression, supporting the conclusion that exposure to electromagnetic field carries keratinocytes to an upper differentiation level. This study confirms our previous observation and supports the hypothesis that 7 Hz electromagnetic field, may modify cell biochemistry interfering in the differentiation and cellular adhesion of normal keratinocytes.
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Affiliation(s)
- Antonella Lisi
- Istituto di Neurobiologia e Medicina Molecolare CNR, Rome, Italy.
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Blackman C. Cell phone radiation: Evidence from ELF and RF studies supporting more inclusive risk identification and assessment. PATHOPHYSIOLOGY 2009; 16:205-16. [PMID: 19264460 DOI: 10.1016/j.pathophys.2009.02.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2009] [Revised: 02/03/2009] [Accepted: 02/03/2009] [Indexed: 11/25/2022] Open
Abstract
Many national and international exposure standards for maximum radiation exposure from the use of cell phone and other similar portable devices are ultimately based on the production of heat particularly in regions of the head, that is, thermal effects (TE). The recent elevation in some countries of the allowable exposure, that is, averaging the exposure that occurs in a 6min period over 10g of tissue rather than over 1g allows for greater heating in small portions of the 10-g volume compared to the exposure that would be allowed averaged over 1-g volume. There is concern that 'hot' spots, that is, momentary higher intensities, could occur in portions of the 10-g tissue piece, might have adverse consequences, particularly in brain tissue. There is another concern about exposure to cell phone radiation that has been virtually ignored except for the National Council of Radiation Protection and Measurements (NCRP) advice given in a publication in 1986 [National Council for Radiation Protection and Measurements, Biological Effects and Exposure Criteria for Radiofrequency Electromagnetic Fields, National Council for Radiation Protection and Measurements, 1986, 400 pp.]. This NCRP review and guidance explicitly acknowledge the existence of non-thermal effects (NTE), and included provisions for reduced maximum-allowable limits should certain radiation characteristics occur during the exposure. If we are to take most current national and international exposure standards as completely protective of thermal injury for acute exposure only (6min time period) then the recent evidence from epidemiological studies associating increases in brain and head cancers with increased cell phone use per day and per year over 8-12 years, raises concerns about the possible health consequences on NTE first acknowledged in the NCRP 1986 report [National Council for Radiation Protection and Measurements, Biological Effects and Exposure Criteria for Radiofrequency Electromagnetic Fields, National Council for Radiation Protection and Measurements, 1986, 400 pp.]. This paper will review some of the salient evidence that demonstrates the existence of NTE and the exposure complexities that must be considered and understood to provide appropriate, more thorough evaluation and guidance for future studies and for assessment of potential health consequences. Unfortunately, this paper is necessary because most national and international reviews of the research area since the 1986 report [National Council for Radiation Protection and Measurements, Biological Effects and Exposure Criteria for Radiofrequency Electromagnetic Fields, National Council for Radiation Protection and Measurements, 1986, 400 pp.] have not included scientists with expertise in NTE, or given appropriate attention to their requests to include NTE in the establishment of public-health-based radiation exposure standards. Thus, those standards are limited because they are not comprehensive.
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Osipenko MA, Mezhevikina LM, Krasts IV, Yashin VA, Novikov VV, Fesenko EE. Deterioration of murine embryonic fibroblasts and early embryos upon magnetic field deprivation. Biophysics (Nagoya-shi) 2009. [DOI: 10.1134/s0006350908040167] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Funk RHW, Monsees T, Ozkucur N. Electromagnetic effects - From cell biology to medicine. ACTA ACUST UNITED AC 2008; 43:177-264. [PMID: 19167986 DOI: 10.1016/j.proghi.2008.07.001] [Citation(s) in RCA: 258] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2008] [Accepted: 07/25/2008] [Indexed: 01/03/2023]
Abstract
In this review we compile and discuss the published plethora of cell biological effects which are ascribed to electric fields (EF), magnetic fields (MF) and electromagnetic fields (EMF). In recent years, a change in paradigm took place concerning the endogenously produced static EF of cells and tissues. Here, modern molecular biology could link the action of ion transporters and ion channels to the "electric" action of cells and tissues. Also, sensing of these mainly EF could be demonstrated in studies of cell migration and wound healing. The triggers exerted by ion concentrations and concomitant electric field gradients have been traced along signaling cascades till gene expression changes in the nucleus. Far more enigmatic is the way of action of static MF which come in most cases from outside (e.g. earth magnetic field). All systems in an organism from the molecular to the organ level are more or less in motion. Thus, in living tissue we mostly find alternating fields as well as combination of EF and MF normally in the range of extremely low-frequency EMF. Because a bewildering array of model systems and clinical devices exits in the EMF field we concentrate on cell biological findings and look for basic principles in the EF, MF and EMF action. As an outlook for future research topics, this review tries to link areas of EF, MF and EMF research to thermodynamics and quantum physics, approaches that will produce novel insights into cell biology.
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Affiliation(s)
- Richard H W Funk
- Technische Universität Dresden, Medizinische Fakultät Carl Gustav Carus, Institut für Anatomie, Germany.
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Electrical Field Effect on Peri-Implant Osteogenesis: A Histologic and Histomorphometric Study. IMPLANT DENT 2008; 17:118-26. [DOI: 10.1097/id.0b013e318166d800] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Volpe P, Eremenko T. Mechanisms of the target response to magnetic fields and their correlation with the biological complexity. ACTA ACUST UNITED AC 2007. [DOI: 10.1007/s10669-007-9085-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Trebbi G, Borghini F, Lazzarato L, Torrigiani P, Calzoni GL, Betti L. Extremely low frequency weak magnetic fields enhance resistance of NN tobacco plants to tobacco mosaic virus and elicit stress-related biochemical activities. Bioelectromagnetics 2007; 28:214-23. [PMID: 17080458 DOI: 10.1002/bem.20296] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Increasing evidence has accumulated concerning the biological effects of extremely low frequency magnetic fields (ELF-MFs) in different plant models. In the present study, effects of ELF-MFs in tobacco plants reacting to tobacco mosaic virus (TMV) with a hypersensitive response (HR) were evaluated. Plants were exposed for 8 or 24 h (either before or after TMV inoculation) to a static MF, at either -17 or 13 microT, combined with a 10 Hz sinusoidal MF with different intensities (25.6 or 28.9 microT). The working variables were the area and number of hypersensitive lesions in leaves. Following ELF-MFs exposure, an increased resistance was detected, particularly after an 8-h treatment, as shown by the decrease in lesion area and number. Moreover, two enzyme activities involved in resistance mechanisms were analyzed: ornithine decarboxylase (ODC) and phenylalanine ammonia-lyase (PAL). Uninoculated leaves previously exposed to ELF-MFs in general showed a significant increase relative to controls in ODC and PAL activities, in particular for 13 microT static MF plus 28.9 microT, 10 Hz sinusoidal MF (24 h) treatment. In conclusion, ELF-MFs seem to influence the HR of tobacco to TMV, as shown by the increased resistance and changes in ODC and PAL activities, indicating the reliability of the present plant model in the study of bioelectromagnetic interactions.
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Affiliation(s)
- Grazia Trebbi
- Dipartimento di Scienze e Tecnologie Agroambientali, Università di Bologna, Italy
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Komazaki S, Takano K. Induction of increase in intracellular calcium concentration of embryonic cells and acceleration of morphogenetic cell movements during amphibian gastrulation by a 50-Hz magnetic field. ACTA ACUST UNITED AC 2007; 307:156-62. [PMID: 17397069 DOI: 10.1002/jez.a.359] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The influence of an alternating electromagnetic field (EMF) on early development of amphibian embryos was examined. When the embryos developed under the influence of a low-frequency EMF (50 Hz, 5-30 mT), the rate of early development was accelerated. The effect of EMF was exerted preferentially at the gastrula stage, and the period of gastrulation was shortened. Histological observations showed that EMF promoted morphogenetic cell movements during the gastrulation. The concentration of intracellular free Ca2+ ([Ca2+]i) in the embryonic cells under the influence of EMF was analyzed using Fura-2, an indicator of the intracellular concentration of calcium ions. The influence of EMF on [Ca2+]i was analyzed in embryonic cells isolated from blastula, gastrula, and neurula, EMF increased a [Ca2+]i particularly in the cells isolated from gastrula. Our results suggest that EMF specifically increased the [Ca2+]i of gastrula cells, thereby, accelerating the rate of morphogenetic cell movements during gastrulation.
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Affiliation(s)
- Shinji Komazaki
- Department of Anatomy, Saitama Medical School, Moroyama, Iruma, Saitama 350-0495, Japan.
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Bernabò N, Tettamanti E, Pistilli MG, Nardinocchi D, Berardinelli P, Mattioli M, Barboni B. Effects of 50 Hz extremely low frequency magnetic field on the morphology and function of boar spermatozoa capacitated in vitro. Theriogenology 2006; 67:801-15. [PMID: 17196643 DOI: 10.1016/j.theriogenology.2006.10.014] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2006] [Revised: 10/03/2006] [Accepted: 10/04/2006] [Indexed: 11/17/2022]
Abstract
The aim of this study was to evaluate the effect of an acute exposure to a sinusoidal MF-ELF (50 Hz, 1mT) on the ability of boar mature spermatozoa to acquire the fertilizing competence in vitro. The spermatozoa exposed during the 4h of incubation to the MF-ELF were evaluated for morphological (surface morphology and acrosome integrity) and functional parameters (cell viability, motility, induction of acrosomal reaction, AR, and the ability to in vitro fertilize oocytes). In parallel, the intracellular Ca(2+) levels as well as the major mechanisms of Ca(2+) clearance were assessed: (45)Ca intakes and intracellular Ca(2+) sequestration by analyzing intracellular Ca(2+) elevation induced by thapsigargin or studying mitochondrial function with Mito-Tracker. The MF-ELF exposure did not affect sperm viability and morphology during the first h of incubation when sperm Ca(2+) homeostasis were already compromised. First of all, MF-ELF treated spermatozoa showed resting intracellular Ca(2+) levels significantly lower than those recorded in controls. This result was dependent on a lower extracellular Ca(2+) intake and from the inhibitory role exerted on both intracellular Ca(2+) storages. As a consequence, after 1h of incubation MF-ELF exposed cells displayed a reduced motility, a modest reactivity when coincubated with solubilized zonae pellucidae and a reduction in oocyte penetrating ability. After 2 or 4h of incubation, in addition, signs of morphological damage appeared on plasma membrane and at acrosomal level. In conclusion, MF-ELF influence negatively spermatozoa first by impairing cell Ca(2+) homeostasis then by dramatically affecting sperm morphology and function.
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Affiliation(s)
- N Bernabò
- Institute of Physiology, Department of Biomedical Science, P.zza Aldo Moro 45, Teramo, Italy
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Funk RHW, Monsees TK. Effects of electromagnetic fields on cells: physiological and therapeutical approaches and molecular mechanisms of interaction. A review. Cells Tissues Organs 2006; 182:59-78. [PMID: 16804297 DOI: 10.1159/000093061] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/26/2006] [Indexed: 01/22/2023] Open
Abstract
This review concentrates on findings described in the recent literature on the response of cells and tissues to electromagnetic fields (EMF). Models of the causal interaction between different forms of EMF and ions or biomolecules of the cell will be presented together with our own results in cell surface recognition. Naturally occurring electric fields are not only important for cell-surface interactions but are also pivotal for the normal development of the organism and its physiological functions. A further goal of this review is to bridge the gap between recent cell biological studies (which, indeed, show new data of EMF actions) and aspects of EMF-based therapy, e.g., in wounds and bone fractures.
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Affiliation(s)
- Richard H W Funk
- Department of Anatomy, University of Technology, Dresden, Germany.
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