1
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Bertagna F, Lewis R, Silva SRP, McFadden J, Jeevaratnam K. Thapsigargin blocks electromagnetic field-elicited intracellular Ca 2+ increase in HEK 293 cells. Physiol Rep 2022; 10:e15189. [PMID: 35510320 PMCID: PMC9069166 DOI: 10.14814/phy2.15189] [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: 11/03/2021] [Revised: 01/06/2022] [Accepted: 01/07/2022] [Indexed: 11/24/2022] Open
Abstract
Biological effects of electromagnetic fields (EMFs) have previously been identified for cellular proliferation and changes in expression and conduction of diverse types of ion channels. The major effect elicited by EMFs seems to be directed toward Ca2+ homeostasis. This is particularly remarkable since Ca2+ acts as a central modulator in various signaling pathways, including, but not limited to, cell differentiation and survival. Despite this, the mechanisms underlying this modulation have yet to be unraveled. Here, we assessed the effect of EMFs on intracellular [Ca2+], by exposing HEK 293 cells to both radio‐frequency electromagnetic fields (RF‐EMFs) and static magnetic fields (SMFs). We detected a constant and significant increase in [Ca2+] subsequent to exposure to both types of fields. Strikingly, the increase was nulled by administration of 10 μM Thapsigargin, a blocker of sarco/endoplasmic reticulum Ca2+‐ATPases (SERCAs), indicating the involvement of the endoplasmic reticulum (ER) in EMF‐related modulation of Ca2+ homeostasis.
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Affiliation(s)
- Federico Bertagna
- Leverhulme Quantum Biology Doctoral Training Centre, University of Surrey, Guildford, Surrey, UK.,School of Veterinary Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, UK
| | - Rebecca Lewis
- Leverhulme Quantum Biology Doctoral Training Centre, University of Surrey, Guildford, Surrey, UK.,School of Veterinary Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, UK
| | - S Ravi P Silva
- Leverhulme Quantum Biology Doctoral Training Centre, University of Surrey, Guildford, Surrey, UK.,Advanced Technology Institute, University of Surrey, Guildford, Surrey, UK
| | - Johnjoe McFadden
- Leverhulme Quantum Biology Doctoral Training Centre, University of Surrey, Guildford, Surrey, UK.,School of Biosciences and Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, UK
| | - Kamalan Jeevaratnam
- Leverhulme Quantum Biology Doctoral Training Centre, University of Surrey, Guildford, Surrey, UK.,School of Veterinary Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, UK
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2
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Lai H, Levitt BB. The roles of intensity, exposure duration, and modulation on the biological effects of radiofrequency radiation and exposure guidelines. Electromagn Biol Med 2022; 41:230-255. [PMID: 35438055 DOI: 10.1080/15368378.2022.2065683] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In this paper, we review the literature on three important exposure metrics that are inadequately represented in most major radiofrequency radiation (RFR) exposure guidelines today: intensity, exposure duration, and signal modulation. Exposure intensity produces unpredictable effects as demonstrated by nonlinear effects. This is most likely caused by the biological system's ability to adjust and compensate but could lead to eventual biomic breakdown after prolonged exposure. A review of 112 low-intensity studies reveals that biological effects of RFR could occur at a median specific absorption rate of 0.0165 W/kg. Intensity and exposure duration interact since the dose of energy absorbed is the product of intensity and time. The result is that RFR behaves like a biological "stressor" capable of affecting numerous living systems. In addition to intensity and duration, man-made RFR is generally modulated to allow information to be encrypted. The effects of modulation on biological functions are not well understood. Four types of modulation outcomes are discussed. In addition, it is invalid to make direct comparisons between thermal energy and radiofrequency electromagnetic energy. Research data indicate that electromagnetic energy is more biologically potent in causing effects than thermal changes. The two likely functionthrough different mechanisms. As such, any current RFR exposure guidelines based on acute continuous-wave exposure are inadequate for health protection.
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Affiliation(s)
- Henry Lai
- Department of Bioengineering, University of Washington, Seattle, WA, USA
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3
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Li Y, Deng P, Chen C, Ma Q, Pi H, He M, Lu Y, Gao P, Zhou C, He Z, Zhang Y, Yu Z, Zhang L. 1,800 MHz Radiofrequency Electromagnetic Irradiation Impairs Neurite Outgrowth With a Decrease in Rap1-GTP in Primary Mouse Hippocampal Neurons and Neuro2a Cells. Front Public Health 2021; 9:771508. [PMID: 34881219 PMCID: PMC8646047 DOI: 10.3389/fpubh.2021.771508] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Accepted: 10/29/2021] [Indexed: 12/23/2022] Open
Abstract
Background: With the global popularity of communication devices such as mobile phones, there are increasing concerns regarding the effect of radiofrequency electromagnetic radiation (RF-EMR) on the brain, one of the most important organs sensitive to RF-EMR exposure at 1,800 MHz. However, the effects of RF-EMR exposure on neuronal cells are unclear. Neurite outgrowth plays a critical role in brain development, therefore, determining the effects of 1,800 MHz RF-EMR exposure on neurite outgrowth is important for exploring its effects on brain development. Objectives: We aimed to investigate the effects of 1,800 MHz RF-EMR exposure for 48 h on neurite outgrowth in neuronal cells and to explore the associated role of the Rap1 signaling pathway. Material and Methods: Primary hippocampal neurons from C57BL/6 mice and Neuro2a cells were exposed to 1,800 MHz RF-EMR at a specific absorption rate (SAR) value of 4 W/kg for 48 h. CCK-8 assays were used to determine the cell viability after 24, 48, and 72 h of irradiation. Neurite outgrowth of primary hippocampal neurons (DIV 2) and Neuro2a cells was observed with a 20 × optical microscope and recognized by ImageJ software. Rap1a and Rap1b gene expressions were detected by real-time quantitative PCR. Rap1, Rap1a, Rap1b, Rap1GAP, and p-MEK1/2 protein expressions were detected by western blot. Rap1-GTP expression was detected by immunoprecipitation. The role of Rap1-GTP was assessed by transfecting a constitutively active mutant plasmid (Rap1-Gly_Val-GFP) into Neuro2a cells. Results: Exposure to 1,800 MHz RF-EMR for 24, 48, and 72 h at 4 W/kg did not influence cell viability. The neurite length, primary and secondary neurite numbers, and branch points of primary mouse hippocampal neurons were significantly impaired by 48-h RF-EMR exposure. The neurite-bearing cell percentage and neurite length of Neuro2a cells were also inhibited by 48-h RF-EMR exposure. Rap1 activity was inhibited by 48-h RF-EMR with no detectable alteration in either gene or protein expression of Rap1. The protein expression of Rap1GAP increased after 48-h RF-EMR exposure, while the expression of p-MEK1/2 protein decreased. Overexpression of constitutively active Rap1 reversed the decrease in Rap1-GTP and the neurite outgrowth impairment in Neuro2a cells induced by 1,800 MHz RF-EMR exposure for 48 h. Conclusion: Rap1 activity and related signaling pathways are involved in the disturbance of neurite outgrowth induced by 48-h 1,800 MHz RF-EMR exposure. The effects of RF-EMR exposure on neuronal development in infants and children deserve greater focus.
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Affiliation(s)
- Yanqi Li
- Key Laboratory of Medical Protection for Electromagnetic Radiation, Department of Occupational Health, Ministry of Education, Third Military Medical University, Chongqing, China
| | - Ping Deng
- Key Laboratory of Medical Protection for Electromagnetic Radiation, Department of Occupational Health, Ministry of Education, Third Military Medical University, Chongqing, China
| | - Chunhai Chen
- Key Laboratory of Medical Protection for Electromagnetic Radiation, Department of Occupational Health, Ministry of Education, Third Military Medical University, Chongqing, China
| | - Qinlong Ma
- Key Laboratory of Medical Protection for Electromagnetic Radiation, Department of Occupational Health, Ministry of Education, Third Military Medical University, Chongqing, China
| | - Huifeng Pi
- Key Laboratory of Medical Protection for Electromagnetic Radiation, Department of Occupational Health, Ministry of Education, Third Military Medical University, Chongqing, China
| | - Mindi He
- Key Laboratory of Medical Protection for Electromagnetic Radiation, Department of Occupational Health, Ministry of Education, Third Military Medical University, Chongqing, China
| | - Yonghui Lu
- Key Laboratory of Medical Protection for Electromagnetic Radiation, Department of Occupational Health, Ministry of Education, Third Military Medical University, Chongqing, China
| | - Peng Gao
- Key Laboratory of Medical Protection for Electromagnetic Radiation, Department of Occupational Health, Ministry of Education, Third Military Medical University, Chongqing, China
| | - Chao Zhou
- Key Laboratory of Medical Protection for Electromagnetic Radiation, Department of Occupational Health, Ministry of Education, Third Military Medical University, Chongqing, China
| | - Zhixin He
- Key Laboratory of Medical Protection for Electromagnetic Radiation, Department of Occupational Health, Ministry of Education, Third Military Medical University, Chongqing, China
| | - Yanwen Zhang
- Key Laboratory of Medical Protection for Electromagnetic Radiation, Department of Occupational Health, Ministry of Education, Third Military Medical University, Chongqing, China
| | - Zhengping Yu
- Key Laboratory of Medical Protection for Electromagnetic Radiation, Department of Occupational Health, Ministry of Education, Third Military Medical University, Chongqing, China
| | - Lei Zhang
- Key Laboratory of Medical Protection for Electromagnetic Radiation, Department of Occupational Health, Ministry of Education, Third Military Medical University, Chongqing, China
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4
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Wood A, Karipidis K. Radiofrequency Fields and Calcium Movements Into and Out of Cells. Radiat Res 2021; 195:101-113. [PMID: 33206197 DOI: 10.1667/rade-20-00101.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 09/14/2020] [Indexed: 11/03/2022]
Abstract
The recent rollout of 5G telecommunications systems has spawned a renewed call to re-examine the possibility of so-called "non-thermal" harmful effects of radiofrequency (RF) radiation. The possibility of calcium being affected by low-level RF has been the subject of research for nearly 50 years and there have been recent suggestions that voltage-gated calcium channels (VGCCs) are "extraordinarily sensitive" to ambient RF fields. This article examines the feasibility of particularly modulated RF coupling to gating mechanisms in VGCCs and also reviews studies from the literature from the last 50 years for consistency of outcome. We conclude that the currents induced by fields at the ICNIRP guideline limits are many orders of magnitude below those needed to affect gating, and there would need to be a biological mechanism for detection and rectification of the extremely-low-frequency (ELF) modulations, which has not been demonstrated. Overall, experimental studies have not validated that RF affects Ca2+ transport into or out of cells.
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Affiliation(s)
- Andrew Wood
- School of Health Sciences, Swinburne University of Technology, Melbourne, Australia
| | - Ken Karipidis
- Australian Radiation Protection and Nuclear Safety Agency, Melbourne, Australia
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Del Re B, Bersani F, Giorgi G. Effect of electromagnetic field exposure on the transcription of repetitive DNA elements in human cells. Electromagn Biol Med 2019; 38:262-270. [DOI: 10.1080/15368378.2019.1669634] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Brunella Del Re
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum University of Bologna, Bologna, Italy
| | - Ferdinando Bersani
- Department of Physics and Astronomy, Alma Mater Studiorum University of Bologna, Bologna, Italy
| | - Gianfranco Giorgi
- Department of Biological, Geological and Environmental Sciences, Alma Mater Studiorum University of Bologna, Bologna, Italy
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6
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Zhou H, Dong G, Zheng W, Wang S, Wang L, Zhi W, Wang C. Radiofrequency radiation at 2.856 GHz does not affect key cellular endpoints in neuron-like PC12 cells. Electromagn Biol Med 2018; 38:102-110. [PMID: 30482060 DOI: 10.1080/15368378.2018.1550787] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
To investigate the potential cytotoxicity of radiofrequency (RF) radiation on central nervous system, rat pheochromocytoma (PC12) cells were exposed to 2.856 GHz RF radiation at a specific absorption rate (SAR) of 4 W/kg for 8 h a day for 2 days in 35 mm Petri dishes. During exposure, the real-time variation of the culture medium temperature was monitored in the first hour. Reactive oxygen species (ROS) production, intracellular Ca2+ concentration, and cell apoptosis rate were assessed immediately after exposure by flow cytometry. The results showed that the medium temperature raised about 0.93 °C, but no significant changes were observed in apoptosis, ROS levels or intracellular Ca2+ concentration after treatment. Although several studies suggested that RF radiation does indeed cause neurological effects, this study presented inconsistent results, indicating that 2.856 GHz RF radiation exposure at a SAR of 4 W/kg does not have a dramatic impact on PC12 cells, and suggests the need for further investigation on the key cellular endpoints of other nerve cells after exposure to RF radiation.
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Affiliation(s)
- Hongmei Zhou
- a Department of Experimental Pathology , Beijing Institute of Radiation Medicine , Beijing P. R. China
| | - Guofu Dong
- a Department of Experimental Pathology , Beijing Institute of Radiation Medicine , Beijing P. R. China
| | - Wen Zheng
- a Department of Experimental Pathology , Beijing Institute of Radiation Medicine , Beijing P. R. China
| | - Shuiming Wang
- a Department of Experimental Pathology , Beijing Institute of Radiation Medicine , Beijing P. R. China
| | - Lifeng Wang
- a Department of Experimental Pathology , Beijing Institute of Radiation Medicine , Beijing P. R. China
| | - Weijia Zhi
- a Department of Experimental Pathology , Beijing Institute of Radiation Medicine , Beijing P. R. China
| | - Changzhen Wang
- a Department of Experimental Pathology , Beijing Institute of Radiation Medicine , Beijing P. R. China
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7
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Ertilav K, Uslusoy F, Ataizi S, Nazıroğlu M. Long term exposure to cell phone frequencies (900 and 1800 MHz) induces apoptosis, mitochondrial oxidative stress and TRPV1 channel activation in the hippocampus and dorsal root ganglion of rats. Metab Brain Dis 2018; 33:753-763. [PMID: 29332300 DOI: 10.1007/s11011-017-0180-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 12/26/2017] [Indexed: 12/11/2022]
Abstract
Mobile phone providers use electromagnetic radiation (EMR) with frequencies ranging from 900 to 1800 MHz. The increasing use of mobile phones has been accompanied by several potentially pathological consequences, such as neurological diseases related to hippocampal (HIPPON) and dorsal root ganglion neuron (DRGN). The TRPV1 channel is activated different stimuli, including CapN, high temperature and oxidative stress. We investigated the contribution TRPV1 to mitochondrial oxidative stress and apoptosis in HIPPON and DRGN following long term exposure to 900 and 1800 MHz in a rat model. Twenty-four adult rats were equally divided into the following groups: (1) control, (2) 900 MHz, and (3) 1800 MHz exposure. Each experimental group was exposed to EMR for 60 min/ 5 days of the week during the one year. The 900 and 1800 MHz EMR exposure induced increases in TRPV1 currents, intracellular free calcium influx (Ca2+), reactive oxygen species (ROS) production, mitochondrial membrane depolarization (JC-1), apoptosis, and caspase 3 and 9 activities in the HIPPON and DRGN. These deleterious processes were further increased in the 1800 MHz experimental group compared to the 900 MHz exposure group. In conclusion, mitochondrial oxidative stress, programmed cell death and Ca2+ entry pathway through TRPV1 activation in the HIPPON and DRGN of rats were increased in the rat model following exposure to 900 and 1800 MHz cell frequencies. Our results suggest that exposure to 900 and 1800 MHz EMR may induce a dose-associated, TRPV1-mediated stress response.
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Affiliation(s)
- Kemal Ertilav
- Departmant of Neurosurgery, Faculty of Medicine, Suleyman Demirel University, Isparta, Turkey
| | - Fuat Uslusoy
- Department of Plastic Reconstructive and Aesthetic Surgery, Faculty of Medicine, Suleyman Demirel University, Isparta, Turkey
| | - Serdar Ataizi
- Departmant of Neurosurgery, Yunusemre General State Hospital, Eskişehir, Turkey
| | - Mustafa Nazıroğlu
- Neuroscience Research Center, Suleyman Demirel University, TR-32260, Isparta, Turkey.
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8
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Su L, Yimaer A, Xu Z, Chen G. Effects of 1800 MHz RF-EMF exposure on DNA damage and cellular functions in primary cultured neurogenic cells. Int J Radiat Biol 2018; 94:295-305. [PMID: 29368975 DOI: 10.1080/09553002.2018.1432913] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
PURPOSE To systematically evaluate the effects of 1800 MHz radiofrequency electromagnetic fields (RF-EMF) exposure on DNA damage and cellular functions in primary cultured neurogenic cells. MATERIALS AND METHODS The primary cultured astrocytes, microglia and cortical neurons were exposed to RF-EMF at a SAR of 4.0 W/kg. The DNA damage was evaluated by γH2AX foci formation assay. The secretions of pro-inflammatory cytokines (TNF-α, IL-6 and IL-1β) in astrocytes and microglia, microglial phagocytic activity and neuronal development were examined by enzyme-linked immunosorbent assay, phagocytosis assay and immunofluorescent staining on microtubule-associated protein tau, microtubule-associated protein 2, postsynaptic density 95 and gephyrin, respectively. RESULTS RF-EMF exposure did not significantly induce γH2AX foci formation in three primary cultured neurogenic cells. Furthermore, RF-EMF exposure did not significantly affect the secretion of cytokines in astrocytes and microglia, and the morphological indicators of dendrites or synapses of cortical neurons. However, the exposure significantly reduced the phagocytic activity of microglia and inhibited the axon branch length and branch number of cortical neurons. CONCLUSIONS Our data demonstrated that exposure to RF-EMF did not elicit DNA damage but inhibited the phagocytic ability of microglia and the axon branch length and branch number of cortical neurons.
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Affiliation(s)
- Liling Su
- a Bioelectromagnetics Laboratory , Zhejiang University School of Medicine , Hangzhou , PR China.,b Department of Clinical Medicine , Jiangxi Medical College , Shangrao , PR China
| | - Aziguli Yimaer
- a Bioelectromagnetics Laboratory , Zhejiang University School of Medicine , Hangzhou , PR China
| | - Zhengping Xu
- a Bioelectromagnetics Laboratory , Zhejiang University School of Medicine , Hangzhou , PR China
| | - Guangdi Chen
- a Bioelectromagnetics Laboratory , Zhejiang University School of Medicine , Hangzhou , PR China.,c Institute of Environmental Health , Zhejiang University School of Public Health , Hangzhou , PR China
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9
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Ruigrok HJ, Arnaud-Cormos D, Hurtier A, Poque E, de Gannes FP, Ruffié G, Bonnaudin F, Lagroye I, Sojic N, Arbault S, Lévêque P, Veyret B, Percherancier Y. Activation of the TRPV1 Thermoreceptor Induced by Modulated or Unmodulated 1800 MHz Radiofrequency Field Exposure. Radiat Res 2017; 189:95-103. [PMID: 29059001 DOI: 10.1667/rr14877.1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The existence of effects of radiofrequency field exposure at environmental levels on living tissues and organisms remains controversial, in particular regarding potential "nonthermal" effects produced in the absence of temperature elevation. Therefore, we investigated whether TRPV1, one of the most studied thermosensitive channels, can be activated by the heat produced by radiofrequency fields and by some specific nonthermal interaction with the fields. We have recently shown that TRPV1 activation can be assessed in real-time on live cells using the bioluminescence resonance energy transfer technique. Taking advantage of this innovative assay, we monitored TRPV1 thermal and chemical modes of activation under radiofrequency exposure at 1800 MHz using different signals (CW, GSM, UMTS, LTE, Wi-Fi and WiMAX) at specific absorption rates between 8 and 32 W/kg. We showed that, as expected, TRPV1 channels were activated by the heat produced by radiofrequency field exposure of transiently-transfected HEK293T cells, but found no evidence of TRPV1 activation in the absence of temperature elevation under radiofrequency field exposure. There was no evidence either that, at fixed temperature, radiofrequency exposure altered the maximal efficacy of the agonist Capsaicin to activate TRPV1.
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Affiliation(s)
- Hermanus J Ruigrok
- a Laboratoire de l'Intégration du Matériau au Système, Centre National de la Recherche Scientifique (CNRS) UMR 5218, Talence, France.,b Université de Bordeaux, Talence, France
| | | | - Annabelle Hurtier
- a Laboratoire de l'Intégration du Matériau au Système, Centre National de la Recherche Scientifique (CNRS) UMR 5218, Talence, France.,b Université de Bordeaux, Talence, France
| | - Emmanuelle Poque
- a Laboratoire de l'Intégration du Matériau au Système, Centre National de la Recherche Scientifique (CNRS) UMR 5218, Talence, France.,b Université de Bordeaux, Talence, France
| | - Florence Poulletier de Gannes
- a Laboratoire de l'Intégration du Matériau au Système, Centre National de la Recherche Scientifique (CNRS) UMR 5218, Talence, France.,b Université de Bordeaux, Talence, France
| | - Gilles Ruffié
- a Laboratoire de l'Intégration du Matériau au Système, Centre National de la Recherche Scientifique (CNRS) UMR 5218, Talence, France.,b Université de Bordeaux, Talence, France
| | - Fabrice Bonnaudin
- a Laboratoire de l'Intégration du Matériau au Système, Centre National de la Recherche Scientifique (CNRS) UMR 5218, Talence, France.,b Université de Bordeaux, Talence, France
| | - Isabelle Lagroye
- a Laboratoire de l'Intégration du Matériau au Système, Centre National de la Recherche Scientifique (CNRS) UMR 5218, Talence, France.,b Université de Bordeaux, Talence, France.,e Paris Sciences et Lettres - EPHE Research University, Paris, France
| | - Neso Sojic
- b Université de Bordeaux, Talence, France.,d ISM, CNRS UMR 5255, NSYSA Group, ENSCBP, Pessac, France
| | - Stéphane Arbault
- b Université de Bordeaux, Talence, France.,d ISM, CNRS UMR 5255, NSYSA Group, ENSCBP, Pessac, France
| | - Philippe Lévêque
- c Université de Limoges, CNRS, XLIM, UMR 7252, F-87000 Limoges, France
| | - Bernard Veyret
- a Laboratoire de l'Intégration du Matériau au Système, Centre National de la Recherche Scientifique (CNRS) UMR 5218, Talence, France.,b Université de Bordeaux, Talence, France
| | - Yann Percherancier
- a Laboratoire de l'Intégration du Matériau au Système, Centre National de la Recherche Scientifique (CNRS) UMR 5218, Talence, France.,b Université de Bordeaux, Talence, France
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10
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Haas AJ, Le Page Y, Zhadobov M, Sauleau R, Dréan YL, Saligaut C. Effect of acute millimeter wave exposure on dopamine metabolism of NGF-treated PC12 cells. JOURNAL OF RADIATION RESEARCH 2017; 58:439-445. [PMID: 28339776 PMCID: PMC5569975 DOI: 10.1093/jrr/rrx004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Indexed: 05/11/2023]
Abstract
Several forthcoming wireless telecommunication systems will use electromagnetic frequencies at millimeter waves (MMWs), and technologies developed around the 60-GHz band will soon know a widespread distribution. Free nerve endings within the skin have been suggested to be the targets of MMW therapy which has been used in the former Soviet Union. So far, no studies have assessed the impact of MMW exposure on neuronal metabolism. Here, we investigated the effects of a 24-h MMW exposure at 60.4 GHz, with an incident power density (IPD) of 5 mW/cm², on the dopaminergic turnover of NGF-treated PC12 cells. After MMW exposure, both intracellular and extracellular contents of dopamine (DA) and 3,4-dihydroxyphenylacetic acid (DOPAC) were studied using high performance liquid chromatography. Impact of exposure on the dopamine transporter (DAT) expression was also assessed by immunocytochemistry. We analyzed the dopamine turnover by assessing the ratio of DOPAC to DA, and measuring DOPAC accumulation in the medium. Neither dopamine turnover nor DAT protein expression level were impacted by MMW exposure. However, extracellular accumulation of DOPAC was found to be slightly increased, but not significantly. This result was related to the thermal effect, and overall, no evidence of non-thermal effects of MMW exposure were observed on dopamine metabolism.
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Affiliation(s)
- Alexis J. Haas
- Institut national de la santé et de la recherche médicale (Inserm), Institute for Research on Environmental and Occupational Health (IRSET), Inserm UMR1085, 9, avenue du Prof. Léon Bernard, 35 000 Rennes, France
- University of Rennes 1, F-35000 Rennes, France
| | - Yann Le Page
- Institut national de la santé et de la recherche médicale (Inserm), Institute for Research on Environmental and Occupational Health (IRSET), Inserm UMR1085, 9, avenue du Prof. Léon Bernard, 35 000 Rennes, France
- University of Rennes 1, F-35000 Rennes, France
| | - Maxim Zhadobov
- University of Rennes 1, F-35000 Rennes, France
- Institute of Electronics and Telecommunications of Rennes (IETR), UMR CNRS 6164, F-35000 Rennes, France
| | - Ronan Sauleau
- University of Rennes 1, F-35000 Rennes, France
- Institute of Electronics and Telecommunications of Rennes (IETR), UMR CNRS 6164, F-35000 Rennes, France
| | - Yves Le Dréan
- Institut national de la santé et de la recherche médicale (Inserm), Institute for Research on Environmental and Occupational Health (IRSET), Inserm UMR1085, 9, avenue du Prof. Léon Bernard, 35 000 Rennes, France
- University of Rennes 1, F-35000 Rennes, France
- Corresponding author. Transcription, Environment and Cancer Group, Institute for Research on Environmental and Occupational Health (IRSET), Inserm UMR1085, 9, avenue du Prof. Léon Bernard, 35 000 Rennes, France. Tel: +33-2-23-23-50-95; Fax: +33-2-23-23-67-94;
| | - Christian Saligaut
- Institut national de la santé et de la recherche médicale (Inserm), Institute for Research on Environmental and Occupational Health (IRSET), Inserm UMR1085, 9, avenue du Prof. Léon Bernard, 35 000 Rennes, France
- University of Rennes 1, F-35000 Rennes, France
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11
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Tanvir S, Thuróczy G, Selmaoui B, Silva Pires Antonietti V, Sonnet P, Arnaud-Cormos D, Lévêque P, Pulvin S, de Seze R. Effects of 3G cell phone exposure on the structure and function of the human cytochrome P450 reductase. Bioelectrochemistry 2016; 111:62-9. [PMID: 27243445 DOI: 10.1016/j.bioelechem.2016.05.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 05/10/2016] [Accepted: 05/10/2016] [Indexed: 11/29/2022]
Abstract
Cell phones increase exposure to radiofrequency (RF) electromagnetic fields (EMFs). Whether EMFs exert specific effects on biological systems remains debatable. This study investigated the effect of cell phone exposure on the structure and function of human NADPH-cytochrome P450 reductase (CPR). CPR plays a key role in the electron transfer to cytochrome P450, which takes part in a wide range of oxidative metabolic reactions in various organisms from microbes to humans. Human CPR was exposed for 60min to 1966-MHz RF inside a transverse electromagnetic cell (TEM-cell) placed in an incubator. The specific absorption rate (SAR) was 5W·kg(-1). Conformation changes have been detected through fluorescent spectroscopy of flavin and tryptophan residues, and investigated through circular dichroism, dynamic light scattering and microelectrophoresis. These showed that CPR was narrowed. By using cytochrome C reductase activity to assess the electron flux through the CPR, the Michaelis Menten constant (Km) and the maximum initial velocity (Vmax) decreased by 22% as compared with controls. This change was due to small changes in the tertiary and secondary structures of the protein at 37°C. The relevance of these findings to an actual RF exposure scenario demands further biochemical and in-vivo confirmation.
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Affiliation(s)
- Shazia Tanvir
- Sorbonne Universités, Université de Technologie de Compiègne, Laboratoire de Génie Enzymatique et Cellulaire, FRE CNRS 3580, CS60319, 60203 Compiègne Cedex. France
| | - György Thuróczy
- Unité de toxicologie expérimentale TOXI-PériTox UMR-I 01, Institut National de l'Environnement Industriel et des RISques (INERIS), Parc ALATA BP2, 60 550, Verneuil-en-Halatte, France; PériTOX, UPJV, Faculté de Médecine, 80 000 Amiens, France
| | - Brahim Selmaoui
- Unité de toxicologie expérimentale TOXI-PériTox UMR-I 01, Institut National de l'Environnement Industriel et des RISques (INERIS), Parc ALATA BP2, 60 550, Verneuil-en-Halatte, France; PériTOX, UPJV, Faculté de Médecine, 80 000 Amiens, France
| | - Viviane Silva Pires Antonietti
- Université de Picardie Jules Verne, Laboratoire de Glycochimie, des Antimicrobiens et des Agroressources, UMR CNRS 7378, UFR de Pharmacie, 80 037, Amiens, France
| | - Pascal Sonnet
- Université de Picardie Jules Verne, Laboratoire de Glycochimie, des Antimicrobiens et des Agroressources, UMR CNRS 7378, UFR de Pharmacie, 80 037, Amiens, France
| | | | - Philippe Lévêque
- Université de Limoges, CNRS, XLIM, UMR 7252, F-87000, Limoges, France
| | - Sylviane Pulvin
- Sorbonne Universités, Université de Technologie de Compiègne, Laboratoire de Génie Enzymatique et Cellulaire, FRE CNRS 3580, CS60319, 60203 Compiègne Cedex. France
| | - René de Seze
- Unité de toxicologie expérimentale TOXI-PériTox UMR-I 01, Institut National de l'Environnement Industriel et des RISques (INERIS), Parc ALATA BP2, 60 550, Verneuil-en-Halatte, France; PériTOX, UPJV, Faculté de Médecine, 80 000 Amiens, France.
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Oster S, Daus AW, Erbes C, Goldhammer M, Bochtler U, Thielemann C. Long-term electromagnetic exposure of developing neuronal networks: A flexible experimental setup. Bioelectromagnetics 2016; 37:264-78. [DOI: 10.1002/bem.21974] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Accepted: 03/14/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Stefan Oster
- BioMEMS Lab; Aschaffenburg University of Applied Sciences; Aschaffenburg Germany
| | - Andreas W. Daus
- BioMEMS Lab; Aschaffenburg University of Applied Sciences; Aschaffenburg Germany
| | - Christian Erbes
- BioMEMS Lab; Aschaffenburg University of Applied Sciences; Aschaffenburg Germany
| | - Michael Goldhammer
- BioMEMS Lab; Aschaffenburg University of Applied Sciences; Aschaffenburg Germany
- Laboratory for Electromagnetic Compatibility (EMC); Aschaffenburg University of Applied Sciences; Aschaffenburg Germany
| | - Ulrich Bochtler
- Laboratory for Electromagnetic Compatibility (EMC); Aschaffenburg University of Applied Sciences; Aschaffenburg Germany
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Haas AJ, Le Page Y, Zhadobov M, Sauleau R, Le Dréan Y. Effects of 60-GHz millimeter waves on neurite outgrowth in PC12 cells using high-content screening. Neurosci Lett 2016; 618:58-65. [PMID: 26921450 DOI: 10.1016/j.neulet.2016.02.038] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 02/21/2016] [Indexed: 01/06/2023]
Abstract
Technologies for wireless telecommunication systems using millimeter waves (MMW) will be widely deployed in the near future. Forthcoming applications in this band, especially around 60GHz, are mainly developed for high data-rate local and body-centric telecommunications. At those frequencies, electromagnetic radiations have a very shallow penetration into biological tissues, making skin keratinocytes, and free nerve endings of the upper dermis the main targets of MMW. Only a few studies assessed the impact of MMW on neuronal cells, and none of them investigated a possible effect on neuronal differentiation. We used a neuron-like cell line (PC12), which undergoes neuronal differentiation when treated with the neuronal growth factor (NGF). PC12 cells were exposed at 60.4GHz for 24h, at an incident power density averaged over the cell monolayer of 10mW/cm(2). Using a large scale cell-by-cell analysis based on high-content screening microscopy approach, we assessed potential effects of MMW on PC12 neurite outgrowth and cytoskeleton protein expression. No differences were found in protein expression of the neuronal marker β3-tubulin nor in internal expression control β-tubulin. On the other hand, our data showed a slight increase, although insignificant, in neurite outgrowth, induced by MMW exposure. However, experimental controls demonstrated that this increase was related to heating.
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Affiliation(s)
- Alexis J Haas
- Transcription, Environment and Cancer Group, Institute of Research in Environmental and Occupational Health (IRSET), INSERM, University of Rennes 1, Rennes, France
| | - Yann Le Page
- Transcription, Environment and Cancer Group, Institute of Research in Environmental and Occupational Health (IRSET), INSERM, University of Rennes 1, Rennes, France
| | - Maxim Zhadobov
- Institute of Electronics and Telecommunications of Rennes (IETR), University of Rennes 1, UMR CNRS, Rennes, France
| | - Ronan Sauleau
- Institute of Electronics and Telecommunications of Rennes (IETR), University of Rennes 1, UMR CNRS, Rennes, France
| | - Yves Le Dréan
- Transcription, Environment and Cancer Group, Institute of Research in Environmental and Occupational Health (IRSET), INSERM, University of Rennes 1, Rennes, France.
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14
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Valbonesi P, Franzellitti S, Bersani F, Contin A, Fabbri E. Activity and expression of acetylcholinesterase in PC12 cells exposed to intermittent 1.8 GHz 217-GSM mobile phone signal. Int J Radiat Biol 2015; 92:1-10. [PMID: 26630175 DOI: 10.3109/09553002.2016.1114188] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE Due to its role in learning, memory and in many neurodegenerative diseases, acetylcholinesterase (AChE) represents an interesting endpoint to assess possible targets of exposure to radiofrequency electromagnetic fields (RF-EMF) generated by mobile phones. We investigated possible alterations of enzymatic activity, gene and protein expression of AChE in neuronal-like cells exposed to a 1.8 GHz Global System for Mobile Communication (GSM) modulated signal (217-GSM). MATERIALS AND METHODS Rat PC12 cells were exposed for 24 h to 1.8 GHz 217-GSM signal. Specific adsorption rate (SAR) was 2 W/kg. AChE enzyme activity was assessed spectrophotometrically by Ellman's method, mRNA expression level was evaluated by real time polymerase chain reaction, and protein expression was assessed by Western blotting. RESULTS AChE enzymatic activity increased of 1.4-fold in PC12 cells exposed to 217-GSM signal for 24 h, whilst AChE transcriptional or translational pathways were not affected. CONCLUSION Our results provide the first evidence of effects on AChE activity after in vitro exposure of mammalian cells to the RF-EMF generated by GSM mobile phones, at the SAR value 2 W/kg. The obtained evidence promotes further investigations on AChE as a possible target of RF-EMF and confirm the ability of 1.8 GHz 217-GSM signal to induce biological effects in different mammalian cells.
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Affiliation(s)
- Paola Valbonesi
- a Interdepartmental Centre for Environmental Science Research, University of Bologna , Campus of Ravenna , Italy ;,b Department of Biological, Geological and Environmental Sciences , University of Bologna , Bologna , Italy
| | - Silvia Franzellitti
- a Interdepartmental Centre for Environmental Science Research, University of Bologna , Campus of Ravenna , Italy ;,b Department of Biological, Geological and Environmental Sciences , University of Bologna , Bologna , Italy
| | | | - Andrea Contin
- a Interdepartmental Centre for Environmental Science Research, University of Bologna , Campus of Ravenna , Italy ;,c Department of Physics , University of Bologna , Bologna , Italy
| | - Elena Fabbri
- a Interdepartmental Centre for Environmental Science Research, University of Bologna , Campus of Ravenna , Italy ;,b Department of Biological, Geological and Environmental Sciences , University of Bologna , Bologna , Italy
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15
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Schmid G, Kuster N. The discrepancy between maximum in vitro exposure levels and realistic conservative exposure levels of mobile phones operating at 900/1800 MHz. Bioelectromagnetics 2015; 36:133-48. [DOI: 10.1002/bem.21895] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Accepted: 12/21/2014] [Indexed: 11/11/2022]
Affiliation(s)
| | - Niels Kuster
- Foundation for Research on Information Technologies in Society (IT'IS); Zurich Switzerland
- Swiss Federal Institute of Technology (ETH); Zurich Switzerland
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16
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Epilepsy But Not Mobile Phone Frequency (900 MHz) Induces Apoptosis and Calcium Entry in Hippocampus of Epileptic Rat: Involvement of TRPV1 Channels. J Membr Biol 2014; 248:83-91. [DOI: 10.1007/s00232-014-9744-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2014] [Accepted: 10/23/2014] [Indexed: 11/24/2022]
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17
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Ghazizadeh V, Nazıroğlu M. Electromagnetic radiation (Wi-Fi) and epilepsy induce calcium entry and apoptosis through activation of TRPV1 channel in hippocampus and dorsal root ganglion of rats. Metab Brain Dis 2014; 29:787-99. [PMID: 24792079 DOI: 10.1007/s11011-014-9549-9] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Accepted: 04/14/2014] [Indexed: 11/28/2022]
Abstract
Incidence rates of epilepsy and use of Wi-Fi worldwide have been increasing. TRPV1 is a Ca(2+) permeable and non-selective channel, gated by noxious heat, oxidative stress and capsaicin (CAP). The hyperthermia and oxidant effects of Wi-Fi may induce apoptosis and Ca(2+) entry through activation of TRPV1 channel in epilepsy. Therefore, we tested the effects of Wi-Fi (2.45 GHz) exposure on Ca(2+) influx, oxidative stress and apoptosis through TRPV1 channel in the murine dorsal root ganglion (DRG) and hippocampus of pentylentetrazol (PTZ)-induced epileptic rats. Rats in the present study were divided into two groups as controls and PTZ. The PTZ groups were divided into two subgroups namely PTZ + Wi-Fi and PTZ + Wi-Fi + capsazepine (CPZ). The hippocampal and DRG neurons were freshly isolated from the rats. The DRG and hippocampus in PTZ + Wi-Fi and PTZ + Wi-Fi + CPZ groups were exposed to Wi-Fi for 1 hour before CAP stimulation. The cytosolic free Ca(2+), reactive oxygen species production, apoptosis, mitochondrial membrane depolarization, caspase-3 and -9 values in hippocampus were higher in the PTZ group than in the control although cell viability values decreased. The Wi-Fi exposure induced additional effects on the cytosolic Ca(2+) increase. However, pretreatment of the neurons with CPZ, results in a protection against epilepsy-induced Ca(2+) influx, apoptosis and oxidative damages. In results of whole cell patch-clamp experiments, treatment of DRG with Ca(2+) channel antagonists [thapsigargin, verapamil + diltiazem, 2-APB, MK-801] indicated that Wi-Fi exposure induced Ca(2+) influx via the TRPV1 channels. In conclusion, epilepsy and Wi-Fi in our experimental model is involved in Ca(2+) influx and oxidative stress-induced hippocampal and DRG death through activation of TRPV1 channels, and negative modulation of this channel activity by CPZ pretreatment may account for the neuroprotective activity against oxidative stress.
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Affiliation(s)
- Vahid Ghazizadeh
- Neuroscience Research Center, University of Suleyman Demirel, 32260, Isparta, Isparta, Turkey
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18
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Rougier C, Prorot A, Chazal P, Leveque P, Leprat P. Thermal and nonthermal effects of discontinuous microwave exposure (2.45 gigahertz) on the cell membrane of Escherichia coli. Appl Environ Microbiol 2014; 80:4832-41. [PMID: 24907330 PMCID: PMC4135774 DOI: 10.1128/aem.00789-14] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Accepted: 05/23/2014] [Indexed: 11/20/2022] Open
Abstract
The aim of this study was to investigate the effects on the cell membranes of Escherichia coli of 2.45-GHz microwave (MW) treatment under various conditions with an average temperature of the cell suspension maintained at 37°C in order to examine the possible thermal versus nonthermal effects of short-duration MW exposure. To this purpose, microwave irradiation of bacteria was performed under carefully defined and controlled parameters, resulting in a discontinuous MW exposure in order to maintain the average temperature of the bacterial cell suspensions at 37°C. Escherichia coli cells were exposed to 200- to 2,000-W discontinuous microwave (DW) treatments for different periods of time. For each experiment, conventional heating (CH) in a water bath at 37°C was performed as a control. The effects of DW exposure on cell membranes was investigated using flow cytometry (FCM), after propidium iodide (PI) staining of cells, in addition to the assessment of intracellular protein release in bacterial suspensions. No effect was detected when bacteria were exposed to conventional heating or 200 W, whereas cell membrane integrity was slightly altered when cell suspensions were subjected to powers ranging from 400 to 2,000 W. Thermal characterization suggested that the temperature reached by the microwave-exposed samples for the contact time studied was not high enough to explain the measured modifications of cell membrane integrity. Because the results indicated that the cell response is power dependent, the hypothesis of a specific electromagnetic threshold effect, probably related to the temperature increase, can be advanced.
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Affiliation(s)
- Carole Rougier
- Ecole Nationale Supérieure d'Ingénieurs de Limoges (ENSIL), University of Limoges, Limoges, France
| | - Audrey Prorot
- Groupement de Recherche Eau Sol et Environnement (GRESE), University of Limoges, Limoges, France
| | - Philippe Chazal
- Groupement de Recherche Eau Sol et Environnement (GRESE), University of Limoges, Limoges, France
| | | | - Patrick Leprat
- Groupement de Recherche Eau Sol et Environnement (GRESE), University of Limoges, Limoges, France
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Valbonesi P, Franzellitti S, Bersani F, Contin A, Fabbri E. Effects of the exposure to intermittent 1.8 GHz radio frequency electromagnetic fields on HSP70 expression and MAPK signaling pathways in PC12 cells. Int J Radiat Biol 2014; 90:382-91. [PMID: 24512569 DOI: 10.3109/09553002.2014.892225] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
PURPOSE We previously reported effects on heat shock protein 70 (HSP70) mRNA expression, a cytoprotective protein induced under stressful condition, in human trophoblast cells exposed to amplitude-modulated Global System for Mobile Communication (GSM) signals. In the present work the same experimental conditions were applied to the rat PC12 cells, in order to assess the stress responses mediated by HSP70 and by the Mitogen Activated Protein Kinases (MAPK) in neuronal-like cells, an interesting model to study possible effects of mobile phone frequencies exposure. MATERIALS AND METHODS HSP70 gene expression level was evaluated by reverse transcriptase polymerase chain reaction, HSP70 protein expression and MAPK phosphorylation were assessed by Western blotting. PC12 cells were exposed for 4, 16 or 24 h to 1.8 GHz continuous wave signal (CW, carrier frequency without modulation) or to two different GSM modulation schemes, GSM-217Hz and GSM-Talk (which generates temporal changes between two different GSM signals, active during talking or listening phases, respectively, thus simulating a typical conversation). Specific adsorption rate (SAR) was 2 W/kg. RESULTS After PC12 cells exposure to the GSM-217Hz signal for 16 or 24 h, HSP70 transcription significantly increased, whereas no effect was observed in cells exposed to the CW or GSM-Talk signals. HSP70 protein expression and three different MAPK signaling pathways were not affected by the exposure to any of the three different 1.8 GHz signals. CONCLUSION The positive effect on HSP70 mRNA expression, observed only in cells exposed to the GSM-217Hz signal, is a repeatable response previously reported in human trophoblast cells and now confirmed in PC12 cells. Further investigations towards a possible role of 1.8 GHz signal modulation are therefore advisable.
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Affiliation(s)
- Paola Valbonesi
- Interdepartmental Centre for Environmental Science Research, University of Bologna , Ravenna
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20
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Gherardini L, Ciuti G, Tognarelli S, Cinti C. Searching for the perfect wave: the effect of radiofrequency electromagnetic fields on cells. Int J Mol Sci 2014; 15:5366-87. [PMID: 24681584 PMCID: PMC4013569 DOI: 10.3390/ijms15045366] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Revised: 01/17/2014] [Accepted: 03/20/2014] [Indexed: 12/23/2022] Open
Abstract
There is a growing concern in the population about the effects that environmental exposure to any source of “uncontrolled” radiation may have on public health. Anxiety arises from the controversial knowledge about the effect of electromagnetic field (EMF) exposure to cells and organisms but most of all concerning the possible causal relation to human diseases. Here we reviewed those in vitro and in vivo and epidemiological works that gave a new insight about the effect of radio frequency (RF) exposure, relating to intracellular molecular pathways that lead to biological and functional outcomes. It appears that a thorough application of standardized protocols is the key to reliable data acquisition and interpretation that could contribute a clearer picture for scientists and lay public. Moreover, specific tuning of experimental and clinical RF exposure might lead to beneficial health effects.
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Affiliation(s)
- Lisa Gherardini
- Institute of Clinical Physiology, Consiglio Nazionale delle Ricerche Siena, Strada Petriccio e Belriguardo, Siena 53100, Italy.
| | - Gastone Ciuti
- The BioRobotics Institute, Scuola Superiore Sant'Anna, Viale Rinaldo Piaggio 34, Pisa 56025, Italy.
| | - Selene Tognarelli
- The BioRobotics Institute, Scuola Superiore Sant'Anna, Viale Rinaldo Piaggio 34, Pisa 56025, Italy.
| | - Caterina Cinti
- Institute of Clinical Physiology, Consiglio Nazionale delle Ricerche Siena, Strada Petriccio e Belriguardo, Siena 53100, Italy.
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21
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Liu YX, Tai JL, Li GQ, Zhang ZW, Xue JH, Liu HS, Zhu H, Cheng JD, Liu YL, Li AM, Zhang Y. Exposure to 1950-MHz TD-SCDMA electromagnetic fields affects the apoptosis of astrocytes via caspase-3-dependent pathway. PLoS One 2012; 7:e42332. [PMID: 22870319 PMCID: PMC3411641 DOI: 10.1371/journal.pone.0042332] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Accepted: 07/03/2012] [Indexed: 01/18/2023] Open
Abstract
The usage of mobile phone increases globally. However, there is still a paucity of data about the impact of electromagnetic fields (EMF) on human health. This study investigated whether EMF radiation would alter the biology of glial cells and act as a tumor-promoting agent. We exposed rat astrocytes and C6 glioma cells to 1950-MHz TD-SCDMA for 12, 24 and 48 h respectively, and found that EMF exposure had differential effects on rat astroctyes and C6 glioma cells. A 48 h of exposure damaged the mitochondria and induced significant apoptosis of astrocytes. Moreover, caspase-3, a hallmark of apoptosis, was highlighted in astrocytes after 48 h of EMF exposure, accompanied by a significantly increased expression of bax and reduced level of bcl-2. The tumorigenicity assays demonstrated that astrocytes did not form tumors in both control and exposure groups. In contrast, the unexposed and exposed C6 glioma cells show no significant differences in both biological feature and tumor formation ability. Therefore, our results implied that exposure to the EMF of 1950-MHz TD-SCDMA may not promote the tumor formation, but continuous exposure damaged the mitochondria of astrocytes and induce apoptosis through a caspase-3-dependent pathway with the involvement of bax and bcl-2.
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Affiliation(s)
- Yu-xiao Liu
- Department of Neurosurgery, The First Affiliated Hospital of PLA General Hospital, Beijing, China
| | | | - Guo-qing Li
- China Telecommunication Technology Labs, Beijing, China
| | - Zhi-wen Zhang
- Department of Neurosurgery, The First Affiliated Hospital of PLA General Hospital, Beijing, China
| | - Jing-hui Xue
- Department of Neurosurgery, The First Affiliated Hospital of PLA General Hospital, Beijing, China
| | - Hong-sheng Liu
- Department of Neurosurgery, The First Affiliated Hospital of PLA General Hospital, Beijing, China
| | - Heng Zhu
- Department of Cell Biology, Institute of Basic Medical Sciences, Beijing, China
| | - Ji-de Cheng
- Department of Cell Biology, Institute of Basic Medical Sciences, Beijing, China
| | - Yuan-ling Liu
- Department of Cell Biology, Institute of Basic Medical Sciences, Beijing, China
| | - An-ming Li
- Department of Neurosurgery, The First Affiliated Hospital of PLA General Hospital, Beijing, China
- * E-mail: (YZ); (AL)
| | - Yi Zhang
- Department of Cell Biology, Institute of Basic Medical Sciences, Beijing, China
- * E-mail: (YZ); (AL)
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22
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Liu J, Mak TCP, Banigesh A, Desai K, Wang R, Wu L. Aldolase B knockdown prevents high glucose-induced methylglyoxal overproduction and cellular dysfunction in endothelial cells. PLoS One 2012; 7:e41495. [PMID: 22911800 PMCID: PMC3404030 DOI: 10.1371/journal.pone.0041495] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Accepted: 06/21/2012] [Indexed: 01/22/2023] Open
Abstract
We used cultured endothelial cells as a model to examine whether up-regulation of aldolase B and enhanced methylglyoxal (MG) formation play an important role in high glucose-induced overproduction of advanced glycosylation endproducts (AGEs), oxidative stress and cellular dysfunction. High glucose (25 mM) incubation up-regulated mRNA levels of aldose reductase (an enzyme converting glucose to fructose) and aldolase B (a key enzyme that catalyzes MG formation from fructose) and enhanced MG formation in human umbilical vein endothelial cells (HUVECs) and HUVEC-derived EA. hy926 cells. High glucose-increased MG production in EA. hy926 cells was completely prevented by siRNA knockdown of aldolase B, but unaffected by siRNA knockdown of aldolase A, an enzyme responsible for MG formation during glycolysis. In addition, inhibition of cytochrome P450 2E1 or semicarbazide-sensitive amine oxidase which produces MG during the metabolism of lipid and proteins, respectively, did not alter MG production. Both high glucose (25 mM) and MG (30, 100 µM) increased the formation of N(ε)-carboxyethyl-lysine (CEL, a MG-induced AGE), oxidative stress (determined by the generation of oxidized DCF, H2O2, protein carbonyls and 8-oxo-dG), O-GlcNAc modification (product of the hexosamine pathway), membrane protein kinase C activity and nuclear translocation of NF-κB in EA. hy926 cells. However, the above metabolic and signaling alterations induced by high glucose were completely prevented by knockdown of aldolase B and partially by application of aminoguanidine (a MG scavenger) or alagebrium (an AGEs breaker). In conclusion, efficient inhibition of aldolase B can prevent high glucose-induced overproduction of MG and related cellular dysfunction in endothelial cells.
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Affiliation(s)
- Jianghai Liu
- Department of Pharmacology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Timothy Chun-Ping Mak
- Department of Pharmacology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Ali Banigesh
- Department of Pharmacology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Kaushik Desai
- Department of Pharmacology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Rui Wang
- Department of Biology, Lakehead University, Thunder Bay, Ontario, Canada
| | - Lingyun Wu
- Department of Pharmacology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
- Department of Health Sciences, Lakehead University and Thunder Bay Regional Research Institute, Thunder Bay, Ontario, Canada
- * E-mail:
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Hao D, Yang L, Chen S, Tian Y, Wu S. 916 MHz electromagnetic field exposure affects rat behavior and hippocampal neuronal discharge. Neural Regen Res 2012; 7:1488-92. [PMID: 25657684 PMCID: PMC4308780 DOI: 10.3969/j.issn.1673-5374.2012.19.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2011] [Accepted: 05/16/2012] [Indexed: 11/23/2022] Open
Abstract
Wistar rats were exposed to a 916 MHz, 10 W/m2 mobile phone electromagnetic field for 6 hours a day, 5 days a week. Average completion times in an eight-arm radial maze were longer in the exposed rats than control rats after 4–5 weeks of exposure. Error rates in the exposed rats were greater than the control rats at 6 weeks. Hippocampal neurons from the exposed rats showed irregular firing patterns during the experiment, and they exhibited decreased spiking activity 6–9 weeks compared with that after 2–5 weeks of exposure. These results indicate that 916 MHz electromagnetic fields influence learning and memory in rats during exposure, but long-term effects are not obvious.
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Affiliation(s)
- Dongmei Hao
- College of Life Science and Bioengineering, Beijing University of Technology, Beijing 100124, China
| | - Lei Yang
- College of Life Science and Bioengineering, Beijing University of Technology, Beijing 100124, China
| | - Su Chen
- College of Biomedical Engineering, South-Central University for Nationalities, Wuhan 430074, Hubei Province, China
| | - Yonghao Tian
- College of Biomedical Engineering, South-Central University for Nationalities, Wuhan 430074, Hubei Province, China
| | - Shuicai Wu
- College of Life Science and Bioengineering, Beijing University of Technology, Beijing 100124, China
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Nazıroğlu M, ÇIğ B, Doğan S, Uğuz AC, Dilek S, Faouzi D. 2.45-Gz wireless devices induce oxidative stress and proliferation through cytosolic Ca2+influx in human leukemia cancer cells. Int J Radiat Biol 2012; 88:449-56. [DOI: 10.3109/09553002.2012.682192] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Kwon MS, Vorobyev V, Kännälä S, Laine M, Rinne JO, Toivonen T, Johansson J, Teräs M, Lindholm H, Alanko T, Hämäläinen H. GSM mobile phone radiation suppresses brain glucose metabolism. J Cereb Blood Flow Metab 2011; 31:2293-301. [PMID: 21915135 PMCID: PMC3323189 DOI: 10.1038/jcbfm.2011.128] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We investigated the effects of mobile phone radiation on cerebral glucose metabolism using high-resolution positron emission tomography (PET) with the (18)F-deoxyglucose (FDG) tracer. A long half-life (109 minutes) of the (18)F isotope allowed a long, natural exposure condition outside the PET scanner. Thirteen young right-handed male subjects were exposed to a pulse-modulated 902.4 MHz Global System for Mobile Communications signal for 33 minutes, while performing a simple visual vigilance task. Temperature was also measured in the head region (forehead, eyes, cheeks, ear canals) during exposure. (18)F-deoxyglucose PET images acquired after the exposure showed that relative cerebral metabolic rate of glucose was significantly reduced in the temporoparietal junction and anterior temporal lobe of the right hemisphere ipsilateral to the exposure. Temperature rise was also observed on the exposed side of the head, but the magnitude was very small. The exposure did not affect task performance (reaction time, error rate). Our results show that short-term mobile phone exposure can locally suppress brain energy metabolism in humans.
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Affiliation(s)
- Myoung Soo Kwon
- Department of Psychology, Centre for Cognitive Neuroscience, University of Turku, Turku, Finland.
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Nazıroğlu M, Çelik Ö, Özgül C, Çiğ B, Doğan S, Bal R, Gümral N, Rodríguez AB, Pariente JA. Melatonin modulates wireless (2.45 GHz)-induced oxidative injury through TRPM2 and voltage gated Ca(2+) channels in brain and dorsal root ganglion in rat. Physiol Behav 2011; 105:683-92. [PMID: 22019785 DOI: 10.1016/j.physbeh.2011.10.005] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Revised: 10/04/2011] [Accepted: 10/05/2011] [Indexed: 01/12/2023]
Abstract
We aimed to investigate the protective effects of melatonin and 2.45 GHz electromagnetic radiation (EMR) on brain and dorsal root ganglion (DRG) neuron antioxidant redox system, Ca(2+) influx, cell viability and electroencephalography (EEG) records in the rat. Thirty two rats were equally divided into four different groups namely group A1: Cage control, group A2: Sham control, group B: 2.45 GHz EMR, group C: 2.45 GHz EMR+melatonin. Groups B and C were exposed to 2.45 GHz EMR during 60 min/day for 30 days. End of the experiments, EEG records and the brain cortex and DRG samples were taken. Lipid peroxidation (LP), cell viability and cytosolic Ca(2+) values in DRG neurons were higher in group B than in groups A1 and A2 although their concentrations were increased by melatonin, 2-aminoethyldiphenyl borinate (2-APB), diltiazem and verapamil supplementation. Spike numbers of EEG records in group C were lower than in group B. Brain cortex vitamin E concentration was higher in group C than in group B. In conclusion, Melatonin supplementation in DRG neurons and brain seems to have protective effects on the 2.45 GHz-induced increase Ca(2+) influx, EEG records and cell viability of the hormone through TRPM2 and voltage gated Ca(2+) channels.
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Affiliation(s)
- M Nazıroğlu
- Department of Biophysics, Medicine Faculty, Süleyman Demirel University, Isparta, Turkey.
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