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Gu H, Fu Y, Yu B, Luo L, Kang D, Xie M, Jing Y, Chen Q, Zhang X, Lai J, Guan F, Forsman H, Shi J, Yang L, Lei J, Du X, Zhang X, Liu C. Ultra-high static magnetic fields cause immunosuppression through disrupting B-cell peripheral differentiation and negatively regulating BCR signaling. MedComm (Beijing) 2023; 4:e379. [PMID: 37789963 PMCID: PMC10542999 DOI: 10.1002/mco2.379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 08/16/2023] [Accepted: 08/24/2023] [Indexed: 10/05/2023] Open
Abstract
To increase the imaging resolution and detection capability, the field strength of static magnetic fields (SMFs) in magnetic resonance imaging (MRI) has significantly increased in the past few decades. However, research on the side effects of high magnetic field is still very inadequate and the effects of SMF above 1 T (Tesla) on B cells have never been reported. Here, we show that 33.0 T ultra-high SMF exposure causes immunosuppression and disrupts B cell differentiation and signaling. 33.0 T SMF treatment resulted in disturbance of B cell peripheral differentiation and antibody secretion and reduced the expression of IgM on B cell membrane, and these might be intensity dependent. In addition, mice exposed to 33.0 T SMF showed inhibition on early activation of B cells, including B cell spreading, B cell receptor clustering and signalosome recruitment, and depression of both positive and negative molecules in the proximal BCR signaling, as well as impaired actin reorganization. Sequencing and gene enrichment analysis showed that SMF stimulation also affects splenic B cells' transcriptome and metabolic pathways. Therefore, in the clinical application of MRI, we should consider the influence of SMF on the immune system and choose the optimal intensity for treatment.
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Affiliation(s)
- Heng Gu
- Department of Pathogen BiologySchool of Basic MedicineTongji Medical College and State Key Laboratory for Diagnosis and Treatment of Severe Zoonostic Infectious DiseaseHuazhong University of Science and TechnologyWuhanChina
| | - Yufan Fu
- Department of Pathogen BiologySchool of Basic MedicineTongji Medical College and State Key Laboratory for Diagnosis and Treatment of Severe Zoonostic Infectious DiseaseHuazhong University of Science and TechnologyWuhanChina
| | - Biao Yu
- High Magnetic Field LaboratoryHefei Institutes of Physical ScienceChinese Academy of SciencesHefeiAnhuiChina
| | - Li Luo
- Department of Pathogen BiologySchool of Basic MedicineTongji Medical College and State Key Laboratory for Diagnosis and Treatment of Severe Zoonostic Infectious DiseaseHuazhong University of Science and TechnologyWuhanChina
| | - Danqing Kang
- Department of Pathogen BiologySchool of Basic MedicineTongji Medical College and State Key Laboratory for Diagnosis and Treatment of Severe Zoonostic Infectious DiseaseHuazhong University of Science and TechnologyWuhanChina
| | - Miaomiao Xie
- Department of Pathogen BiologySchool of Basic MedicineTongji Medical College and State Key Laboratory for Diagnosis and Treatment of Severe Zoonostic Infectious DiseaseHuazhong University of Science and TechnologyWuhanChina
| | - Yukai Jing
- Department of Pathogen BiologySchool of Basic MedicineTongji Medical College and State Key Laboratory for Diagnosis and Treatment of Severe Zoonostic Infectious DiseaseHuazhong University of Science and TechnologyWuhanChina
| | - Qiuyue Chen
- Department of Pathogen BiologySchool of Basic MedicineTongji Medical College and State Key Laboratory for Diagnosis and Treatment of Severe Zoonostic Infectious DiseaseHuazhong University of Science and TechnologyWuhanChina
| | - Xin Zhang
- GeneMind Biosciences Company LimitedShenzhenChina
| | - Juan Lai
- GeneMind Biosciences Company LimitedShenzhenChina
| | - Fei Guan
- Department of Pathogen BiologySchool of Basic MedicineTongji Medical College and State Key Laboratory for Diagnosis and Treatment of Severe Zoonostic Infectious DiseaseHuazhong University of Science and TechnologyWuhanChina
| | - Huamei Forsman
- Department of Rheumatology and Inflammation ResearchInstitute of MedicineSahlgrenska AcademyUniversity of GothenburgGoteborgSweden
| | - Junming Shi
- Department of Pathogen BiologySchool of Basic MedicineTongji Medical College and State Key Laboratory for Diagnosis and Treatment of Severe Zoonostic Infectious DiseaseHuazhong University of Science and TechnologyWuhanChina
| | - Lu Yang
- Department of Pathogen BiologySchool of Basic MedicineTongji Medical College and State Key Laboratory for Diagnosis and Treatment of Severe Zoonostic Infectious DiseaseHuazhong University of Science and TechnologyWuhanChina
| | - Jiahui Lei
- Department of Pathogen BiologySchool of Basic MedicineTongji Medical College and State Key Laboratory for Diagnosis and Treatment of Severe Zoonostic Infectious DiseaseHuazhong University of Science and TechnologyWuhanChina
| | - Xingrong Du
- Shanghai Key Laboratory of Metabolic Remodeling and HealthInstitute of Metabolism and Integrative BiologyFudan UniversityShanghaiChina
| | - Xin Zhang
- High Magnetic Field LaboratoryHefei Institutes of Physical ScienceChinese Academy of SciencesHefeiAnhuiChina
- Institutes of Physical Science and Information TechnologyAnhui UniversityHefeiAnhuiChina
| | - Chaohong Liu
- Department of Pathogen BiologySchool of Basic MedicineTongji Medical College and State Key Laboratory for Diagnosis and Treatment of Severe Zoonostic Infectious DiseaseHuazhong University of Science and TechnologyWuhanChina
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Bond A, Bruno V, Johnson J, George S, Ascione R. Development and Preliminary Testing of Porcine Blood-Derived Endothelial-like Cells for Vascular Tissue Engineering Applications: Protocol Optimisation and Seeding of Decellularised Human Saphenous Veins. Int J Mol Sci 2022; 23:ijms23126633. [PMID: 35743073 PMCID: PMC9223800 DOI: 10.3390/ijms23126633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 05/31/2022] [Accepted: 06/05/2022] [Indexed: 12/03/2022] Open
Abstract
Functional endothelial cells (EC) are a critical interface between blood vessels and the thrombogenic flowing blood. Disruption of this layer can lead to early thrombosis, inflammation, vessel restenosis, and, following coronary (CABG) or peripheral (PABG) artery bypass graft surgery, vein graft failure. Blood-derived ECs have shown potential for vascular tissue engineering applications. Here, we show the development and preliminary testing of a method for deriving porcine endothelial-like cells from blood obtained under clinical conditions for use in translational research. The derived cells show cobblestone morphology and expression of EC markers, similar to those seen in isolated porcine aortic ECs (PAEC), and when exposed to increasing shear stress, they remain viable and show mRNA expression of EC markers similar to PAEC. In addition, we confirm the feasibility of seeding endothelial-like cells onto a decellularised human vein scaffold with approximately 90% lumen coverage at lower passages, and show that increasing cell passage results in reduced endothelial coverage.
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Liu Y, Sun Q, Hao M, Tan WS, Cai H. A novel magnetically controlled bioreactor for ex vivo expansion of NK-92 cells. BIORESOUR BIOPROCESS 2022; 9:50. [PMID: 38647827 PMCID: PMC10992792 DOI: 10.1186/s40643-022-00537-z] [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: 12/31/2021] [Accepted: 04/08/2022] [Indexed: 11/10/2022] Open
Abstract
The application of natural killer (NK) cells as potential antitumor effector cells appears to be valuable for immunotherapies. However, the clinical use of NK cells is limited because the technical difficulties associated with mass production NK cells at sufficiently high numbers represents a great challenge. Ex vivo expansion of NK cells is a key technology for cell therapy. Bioreactor systems can generate homogeneous culture condition and modulate the environmental and biochemical cues. In this study, a novel magnetically controlled bioreactor was developed for supporting NK cells ex vivo expansion. Using synthetic magnetic beads, the stirring device of the magnetically controlled bioreactor generated reduced shearing force. The intermittent magnetic field was applied for magnetic beads movement to homogenize the culture system. NK-92 cells were cultured in the magnetically controlled bioreactor and the expansion and function of expanded cells were investigated on day 8. The results showed that the expansion of NK-92 cells in the bioreactor was 67.71 ± 10.60-fold, which was significantly higher than that of the T25 culture flask (P < 0.05). Moreover, the proportions of CD3-CD56+ cells and cell killing activity of expanded cells in the bioreactor did not reveal any differences compared to T25 flasks. Taken together, this study demonstrated the possibility of magnetically controlled bioreactor as a potent strategy in NK cells production for facilitating cancer immunotherapy.
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Affiliation(s)
- Yangyang Liu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Qihao Sun
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Mengyang Hao
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Wen-Song Tan
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Haibo Cai
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China.
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Lei H, Pan Y, Wu R, Lv Y. Innate Immune Regulation Under Magnetic Fields With Possible Mechanisms and Therapeutic Applications. Front Immunol 2020; 11:582772. [PMID: 33193393 PMCID: PMC7649827 DOI: 10.3389/fimmu.2020.582772] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 09/28/2020] [Indexed: 11/13/2022] Open
Abstract
With the wide applications of magnetic fields (MFs) in medicine, researchers from different disciplines have gained interest in understanding the effect of various types of MFs on living cells and organisms. In this paper, we mainly focus on the immunological and physical aspects of the immune responses and their mechanisms under different types of MFs. Immune cells were slightly affected by low-frequency alternating MFs but were strongly influenced by moderate-intensity MFs and high-gradient MFs (HGMFs). Larger immune cells, such as macrophages, were more sensitive to HGMFs, which biased the cell polarization into the anti-inflammatory M2 phenotype. Subject to the gradient forces of varying directions and strength, the elongated M2 macrophage also remodeled the cytoskeleton with actin polymerization and changed the membrane receptors and ion channel gating. These alterations were very similar to changes caused by the small GTPase RhoA interference in macrophage. Regulation of iron metabolism may also contribute to the MF effects in macrophages. High MFs were found to regulate the iron content in monocyte-/macrophage-derived osteoclasts by affecting the expression of iron-regulation genes. On the other hand, paramagnetic nanoparticles (NPs) combined with external MFs play an important role in T-cell immunity. Paramagnetic NP-coated T-cells can cluster their T-cell receptors (TCRs) by using an external MF, thus increasing the cell–cell contact and communication followed by enhanced tumor killing capacity. The external MF can also guide the adoptively transferred magnetic NP-coated T-cells to their target sites in vivo, thus dramatically increasing the efficiency of cell therapy. Additionally, iron oxide NPs for ferroptosis-based cancer therapy and other MF-related therapeutic applications with obstacles were also addressed. Furthermore, for a profound understanding of the effect of MFs on immune cells, multidisciplinary research involving both experimental research and theoretical modeling is essential.
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Affiliation(s)
- Hong Lei
- National Local Joint Engineering Research Center for Precision Surgery and Regenerative Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Yi Pan
- Center for Spintronics and Quantum Systems, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
| | - Rongqian Wu
- National Local Joint Engineering Research Center for Precision Surgery and Regenerative Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Yi Lv
- National Local Joint Engineering Research Center for Precision Surgery and Regenerative Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.,Department of Hepatobiliary Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
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Moderate static magnetic fields enhance antitumor CD8 + T cell function by promoting mitochondrial respiration. Sci Rep 2020; 10:14519. [PMID: 32884074 PMCID: PMC7471296 DOI: 10.1038/s41598-020-71566-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 08/10/2020] [Indexed: 12/26/2022] Open
Abstract
With the discovery of magnetoreceptor mechanisms in animals, it materialized the novel applications of controlling cell and animal behaviors using magnetic fields. T cells have shown to be sensitive to magnetic fields. Here, we reported that exposure to moderate SMFs (static magnetic fields) led to increased granule and cytokine secretion as well as ATP production and mitochondrial respiration from CD8+ T cells. These effects were inhibited by knocking down the Uqcrb and Ndufs6 genes of mitochondrial respiratory chain, whose transcriptions were regulated by candidate magnetoreceptor genes Isca1 and Cry1/Cry2. SMF exposure also promoted CD8+ T cell granule and cytokine secretion and repressed tumor growth in vivo. SMFs enhanced CD8+ T cell cytotoxicity, and the adoptive transfer into tumor-bearing mice resulted in enhanced antitumor effects. Collectively, our study suggests that moderate SMFs enhance CD8+ T cell cytotoxicity by promoting mitochondrial respiration and promoted the antitumor function of CD8+ T cells.
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Jalali A, Zafari J, Jouni FJ, Abdolmaleki P, Shirazi FH, Khodayar MJ. Combination of static magnetic field and cisplatin in order to reduce drug resistance in cancer cell lines. Int J Radiat Biol 2019; 95:1194-1201. [PMID: 30822212 DOI: 10.1080/09553002.2019.1589012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Purpose: In this study, the effects of different intensities of Static Magnetic Fields (SMFs) (10, 15 and 25 mT) and different concentrations of cisplatin drug were investigated on the viability percent and IC50 of the A2780 and A2780-CP cell lines at 24, 48 and 96 h to show useful potential of SMF as a physical agent to enhance the effectiveness of common therapeutic approaches and decrease of drug resistance to cisplatin anticancer drug. Materials and methods: Magnetic field exposure was performed using a locally designed generator. The cell viability percent, IC50 and cisplatin uptake in treated cells were evaluated by MTT assay and inductively coupled plasma (ICP), respectively. Results: Increasing of concentration and time of cisplatin drug showed a noticeable decrease in viability percent in sensitive and resistant cell lines compared with control group. These decreases were more significant in resistant cells compared with sensitive cells. The obtained IC50 values for resistant were greater than the values obtained for A2780 cells. ICP analysis demonstrated an increased uptake of cisplatin after treatment for 48 and 96 h relative to untreated groups in both resistant and sensitive cells. Conclusion: Results showed that A2780 cells were more sensitive to cisplatin than A2780-CP. Studies have shown that SMF can increase the effect of cisplatin on cell viability percent and decrease the resistance of A2780-CP cells by producing large, verruca shaped structures at the surface of the cell membrane.
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Affiliation(s)
- Amir Jalali
- a Toxicology Research Center and Department of Toxicology, School of Pharmacy and, Ahvaz Jundishapur University of Medical Sciences , Ahvaz , Iran
| | - Jaber Zafari
- a Toxicology Research Center and Department of Toxicology, School of Pharmacy and, Ahvaz Jundishapur University of Medical Sciences , Ahvaz , Iran
| | - Fatemeh Javani Jouni
- b Department of Microbiology, Islamic Azad University, Tehran North Branch , Tehran , Iran
| | - Parviz Abdolmaleki
- c Faculty of Biological Sciences, Department of Biophysics, Tarbiat Modares University , Tehran , Iran
| | - Farshad H Shirazi
- d Department of Toxico/Pharmacology, School of Pharmacy, Shahid Beheshti University of Medical Sciences , Tehran , Iran.,e Pharmaceutical Sciences Research Center, Shahid Beheshti University of Medical Sciences , Tehran , Iran
| | - Mohammad Javad Khodayar
- a Toxicology Research Center and Department of Toxicology, School of Pharmacy and, Ahvaz Jundishapur University of Medical Sciences , Ahvaz , Iran
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Fasshauer M, Krüwel T, Zapf A, Stahnke VC, Rave-Fränk M, Staab W, Sohns JM, Steinmetz M, Unterberg-Buchwald C, Schuster A, Ritter C, Lotz J. Absence of DNA double-strand breaks in human peripheral blood mononuclear cells after 3 Tesla magnetic resonance imaging assessed by γH2AX flow cytometry. Eur Radiol 2017; 28:1149-1156. [DOI: 10.1007/s00330-017-5056-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Revised: 08/19/2017] [Accepted: 09/04/2017] [Indexed: 12/15/2022]
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Albuquerque WWC, Costa RMPB, Fernandes TDSE, Porto ALF. Evidences of the static magnetic field influence on cellular systems. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2016; 121:16-28. [DOI: 10.1016/j.pbiomolbio.2016.03.003] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 03/10/2016] [Indexed: 01/29/2023]
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Guerriero F, Ricevuti G. Extremely low frequency electromagnetic fields stimulation modulates autoimmunity and immune responses: a possible immuno-modulatory therapeutic effect in neurodegenerative diseases. Neural Regen Res 2016; 11:1888-1895. [PMID: 28197174 PMCID: PMC5270416 DOI: 10.4103/1673-5374.195277] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Increasing evidence shows that extremely low frequency electromagnetic fields (ELF-EMFs) stimulation is able to exert a certain action on autoimmunity and immune cells. In the past, the efficacy of pulsed ELF-EMFs in alleviating the symptoms and the progression of multiple sclerosis has been supported through their action on neurotransmission and on the autoimmune mechanisms responsible for demyelination. Regarding the immune system, ELF-EMF exposure contributes to a general activation of macrophages, resulting in changes of autoimmunity and several immunological reactions, such as increased reactive oxygen species-formation, enhanced phagocytic activity and increased production of chemokines. Transcranial electromagnetic brain stimulation is a non-invasive novel technique used recently to treat different neurodegenerative disorders, in particular Alzheimer's disease. Despite its proven value, the mechanisms through which EMF brain-stimulation exerts its beneficial action on neuronal function remains unclear. Recent studies have shown that its beneficial effects may be due to a neuroprotective effect on oxidative cell damage. On the basis of in vitro and clinical studies on brain activity, modulation by ELF-EMFs could possibly counteract the aberrant pro-inflammatory responses present in neurodegenerative disorders reducing their severity and their onset. The objective of this review is to provide a systematic overview of the published literature on EMFs and outline the most promising effects of ELF-EMFs in developing treatments of neurodegenerative disorders. In this regard, we review data supporting the role of ELF-EMF in generating immune-modulatory responses, neuromodulation, and potential neuroprotective benefits. Nonetheless, we reckon that the underlying mechanisms of interaction between EMF and the immune system are still to be completely understood and need further studies at a molecular level.
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Affiliation(s)
- Fabio Guerriero
- Department of Internal Medicine and Medical Therapy, Section of Geriatrics, University of Pavia, Pavia, Italy; Azienda di Servizi alla Persona, Istituto di Cura Santa Margherita of Pavia, Pavia, Italy
| | - Giovanni Ricevuti
- Department of Internal Medicine and Medical Therapy, Section of Geriatrics, University of Pavia, Pavia, Italy; Azienda di Servizi alla Persona, Istituto di Cura Santa Margherita of Pavia, Pavia, Italy
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Reddig A, Fatahi M, Friebe B, Guttek K, Hartig R, Godenschweger F, Roggenbuck D, Ricke J, Reinhold D, Speck O. Analysis of DNA Double-Strand Breaks and Cytotoxicity after 7 Tesla Magnetic Resonance Imaging of Isolated Human Lymphocytes. PLoS One 2015; 10:e0132702. [PMID: 26176601 PMCID: PMC4503586 DOI: 10.1371/journal.pone.0132702] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Accepted: 06/17/2015] [Indexed: 01/25/2023] Open
Abstract
The global use of magnetic resonance imaging (MRI) is constantly growing and the field strengths increasing. Yet, only little data about harmful biological effects caused by MRI exposure are available and published research analyzing the impact of MRI on DNA integrity reported controversial results. This in vitro study aimed to investigate the genotoxic and cytotoxic potential of 7 T ultra-high-field MRI on isolated human peripheral blood mononuclear cells. Hence, unstimulated mononuclear blood cells were exposed to 7 T static magnetic field alone or in combination with maximum permissible imaging gradients and radiofrequency pulses as well as to ionizing radiation during computed tomography and γ-ray exposure. DNA double-strand breaks were quantified by flow cytometry and automated microscopy analysis of immunofluorescence stained γH2AX. Cytotoxicity was studied by CellTiter-Blue viability assay and [3H]-thymidine proliferation assay. Exposure of unstimulated mononuclear blood cells to 7 T static magnetic field alone or combined with varying gradient magnetic fields and pulsed radiofrequency fields did not induce DNA double-strand breaks, whereas irradiation with X- and γ-rays led to a dose-dependent induction of γH2AX foci. The viability assay revealed a time- and dose-dependent decrease in metabolic activity only among samples exposed to γ-radiation. Further, there was no evidence for altered proliferation response after cells were exposed to 7 T MRI or low doses of ionizing radiation (≤ 0.2 Gy). These findings confirm the acceptance of MRI as a safe non-invasive diagnostic imaging tool, but whether MRI can induce other types of DNA lesions or DNA double-strand breaks during altered conditions still needs to be investigated.
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Affiliation(s)
- Annika Reddig
- Institute of Molecular and Clinical Immunology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
- * E-mail:
| | - Mahsa Fatahi
- Department of Biomedical Magnetic Resonance, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
| | - Björn Friebe
- Department of Radiology and Nuclear Medicine, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
| | - Karina Guttek
- Institute of Molecular and Clinical Immunology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
| | - Roland Hartig
- Institute of Molecular and Clinical Immunology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
| | - Frank Godenschweger
- Department of Biomedical Magnetic Resonance, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
| | - Dirk Roggenbuck
- Medipan GmbH, Dahlewitz/Berlin, Germany
- Faculty of Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg, Germany
| | - Jens Ricke
- Department of Radiology and Nuclear Medicine, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
| | - Dirk Reinhold
- Institute of Molecular and Clinical Immunology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
| | - Oliver Speck
- Department of Biomedical Magnetic Resonance, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
- Leibniz Institute for Neurobiology, Magdeburg, Germany
- Center for Behavioral Brain Sciences, Magdeburg, Germany
- German Center for Neurodegenerative Disease, Magdeburg, Germany
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Effect of long-term pulsed electromagnetic field exposure on hepatic and immunologic functions of rats. Wien Klin Wochenschr 2015; 127:959-62. [PMID: 25910613 DOI: 10.1007/s00508-015-0732-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Accepted: 01/19/2015] [Indexed: 02/04/2023]
Abstract
BACKGROUND In this report, the effects of long-term pulsed electromagnetic field (PEMF) exposure on hepatic and immunologic functions were examined. METHODS Male rats were randomly divided into four groups: a control group and three experimental groups exposed to a 50-Hz PEMF at 5, 10, or 20 mT for 10 weeks. RESULTS Compared with the control group, activities of serum alanine aminotransferase and aspartate aminotransferase and concentrations of serum, liver, and spleen Metabolism of lipid peroxidation (MDA) in the 10- and 20-mT PEMF groups were significantly increased. The activities of Glutathione peroxidase (GSH-Px) and Superoxide Dismutase (SOD) in the serum, liver, and spleen and concentrations of serum immunoglobulins were significantly decreased. CONCLUSION These results demonstrate that long-term exposure to PEMF can lead to oxidative damage of the liver and spleen.
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Wang L, Du H, Guo X, Wang X, Wang M, Wang Y, Wang M, Chen S, Wu L, Xu A. Developmental abnormality induced by strong static magnetic field inCaenorhabditis elegans. Bioelectromagnetics 2015; 36:178-89. [DOI: 10.1002/bem.21906] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2013] [Accepted: 02/11/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Lei Wang
- Key Laboratory of Ion Beam Bioengineering; Institute of Technical Biology and Agricultural Engineering; Hefei Institutes of Physical Science; Chinese Academy of Science; Hefei Anhui People's Republic of China
| | - Hua Du
- Key Laboratory of Ion Beam Bioengineering; Institute of Technical Biology and Agricultural Engineering; Hefei Institutes of Physical Science; Chinese Academy of Science; Hefei Anhui People's Republic of China
| | - Xiaoying Guo
- Key Laboratory of Ion Beam Bioengineering; Institute of Technical Biology and Agricultural Engineering; Hefei Institutes of Physical Science; Chinese Academy of Science; Hefei Anhui People's Republic of China
| | - Xinan Wang
- Key Laboratory of Ion Beam Bioengineering; Institute of Technical Biology and Agricultural Engineering; Hefei Institutes of Physical Science; Chinese Academy of Science; Hefei Anhui People's Republic of China
| | - Meimei Wang
- Key Laboratory of Ion Beam Bioengineering; Institute of Technical Biology and Agricultural Engineering; Hefei Institutes of Physical Science; Chinese Academy of Science; Hefei Anhui People's Republic of China
| | - Yichen Wang
- Key Laboratory of Ion Beam Bioengineering; Institute of Technical Biology and Agricultural Engineering; Hefei Institutes of Physical Science; Chinese Academy of Science; Hefei Anhui People's Republic of China
| | - Min Wang
- Key Laboratory of Ion Beam Bioengineering; Institute of Technical Biology and Agricultural Engineering; Hefei Institutes of Physical Science; Chinese Academy of Science; Hefei Anhui People's Republic of China
| | - Shaopeng Chen
- Key Laboratory of Ion Beam Bioengineering; Institute of Technical Biology and Agricultural Engineering; Hefei Institutes of Physical Science; Chinese Academy of Science; Hefei Anhui People's Republic of China
| | - Lijun Wu
- Key Laboratory of Ion Beam Bioengineering; Institute of Technical Biology and Agricultural Engineering; Hefei Institutes of Physical Science; Chinese Academy of Science; Hefei Anhui People's Republic of China
| | - An Xu
- Key Laboratory of Ion Beam Bioengineering; Institute of Technical Biology and Agricultural Engineering; Hefei Institutes of Physical Science; Chinese Academy of Science; Hefei Anhui People's Republic of China
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Kubinyi G, Zeitler Z, Thuróczy G, Juhász P, Bakos J, Sinay H, László J. Effects of homogeneous and inhomogeneous static magnetic fields combined with gamma radiation on DNA and DNA repair. Bioelectromagnetics 2011; 31:488-94. [PMID: 20564169 DOI: 10.1002/bem.20577] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The aim of this study was to reveal whether static magnetic fields (SMFs) influence the repair of radiation-damaged DNA on leukocytes or has any effect on DNA. After 4 Gy of (60)Co-gamma irradiation, some of the samples were exposed to inhomogeneous SMFs with a lateral magnetic flux density gradient of 47.7, 1.2, or 0.3 T/m by 10 mm lateral periodicity, while other samples were exposed to homogeneous SMF of 159.2 +/- 13.4 mT magnetic flux density for a time period of 0.5 min, 1, 2, 4, 6, 18, 20, or 24 h. Another set of samples was exposed to the aforementioned SMFs before gamma irradiation. The following three groups were examined: (i) exposed to SMF only, (ii) exposed to SMF following irradiation by (60)Co-gamma, and (iii) exposed to SMF before (60)Co-gamma irradiation. The analysis of the DNA damage was made by single-cell gel electrophoresis technique (comet assay). Statistically significant differences were found at 1 h (iSMF), 4 h (hSMF), and 18 h (hSMF) if samples were exposed to only SMF, compared to control. When the SMF exposure followed the (60)Co-gamma irradiation, statistically significant differences were found at 1 h (iSMF) and 4 h (hSMF). If exposure to SMF preceded (60)Co-gamma irradiation, no statistically significant difference was found compared to 4 Gy gamma-irradiated group.
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Affiliation(s)
- Györgyi Kubinyi
- "Frédéric Joliot-Curie" National Research Institute for Radiobiology and Radiohygiene, Budapest, Hungary
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Dini L, Panzarini E. The influence of a 6 mT static magnetic field on apoptotic cell phagocytosis depends on monocyte/macrophage differentiation. Exp Biol Med (Maywood) 2011; 235:1432-41. [PMID: 21127341 DOI: 10.1258/ebm.2010.010122] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In a previous work we showed that a 6 mT static magnetic field (SMF) interferes with monocyte/macrophage 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced differentiation of promonocytes (U937 cells) and monocytes (THP-1 cells). In this study we investigated whether in the same cells and under the same conditions, phagocytosis of apoptotic cells is influenced by 6 mT SMF exposure. Fluid phase endocytosis and phagocytosis of latex particles were also analyzed for comparison. The results indicate that SMF exposure has effects on phagocytosis but not on fluid phase endocytosis, and that these effects are greater at the late stages of macrophage differentiation (THP-1 > U937 cells). The phagocytosis index and rate of phagocytosis decreased under SMF exposure while the number of latex particles bound to the plasma membrane of TPA-differentiated U937 and THP-1 cells increased. Conversely, the rate of phagocytosis of apoptotic cells increased under SMF exposure, while the number of apoptotic cells bound to the plasma membrane of isolated human Kupffer cells, Raw 264.7 macrophages and TPA-differentiated THP-1 and U937 cells decreased. In non-differentiated U937 and THP-1 cells, the SMF exposure enhanced the number of cell-surface bound apoptotic cells and latex beads.
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Affiliation(s)
- Luciana Dini
- Department of Biological and Environmental Science and Technology (Di.S.Te.B.A.), University of Salento, Via per Monteroni, 73100 Lecce, Italy.
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László JF, Szilvási J, Fényi A, Szalai A, Gyires K, Pórszász R. Daily exposure to inhomogeneous static magnetic field significantly reduces blood glucose level in diabetic mice. Int J Radiat Biol 2010; 87:36-45. [DOI: 10.3109/09553002.2010.518200] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Monzen S, Takahashi K, Toki T, Ito E, Sakurai T, Miyakoshi J, Kashiwakura I. Exposure to a MRI-type high-strength static magnetic field stimulates megakaryocytic/erythroid hematopoiesis in CD34+cells from human placental and umbilical cord blood. Bioelectromagnetics 2009; 30:280-5. [DOI: 10.1002/bem.20480] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hsieh CH, Lee MC, Tsai-Wu JJ, Chen MH, Lee HS, Chiang H, Herbert Wu CH, Jiang CC. Deleterious effects of MRI on chondrocytes. Osteoarthritis Cartilage 2008; 16:343-51. [PMID: 17804262 DOI: 10.1016/j.joca.2007.07.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2006] [Accepted: 07/03/2007] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To assess how magnetic fields (MFs), with or without concurrent radio frequency (RF), influence chondrocytes and knee joint repair, we applied an MF strength via magnetic resonance imaging (MRI) slightly greater than the frequently used dosage in the clinics and examined the effects of these treatments in vitro on human chondrocytes and in vivo in pigs. METHODS Human chondrocytes were directly exposed to a 3-tesla (T) magnetic field (MF group) or a 3-T static magnetic field plus 125.3 MHz radio frequency (MF+RF group), and cell proliferation, apoptosis, cytosolic Ca2+ ([Ca2+]i) fluxes and expression of the apoptosis-related proteins of the treated cells were examined to assess the effects of the treatments. In the pig study, we examined the effects of the treatments on the recovery of surgically damaged pig knees. RESULTS A 3-T static MF and RF suppressed cell growth and induced apoptosis through p53, p21, p27 and Bax protein expression. In the pig model, we found that MRI surveillance had a deleterious effect on the recovery of the damaged knee cartilage. CONCLUSION Magnetic strength, with or without concurrent RF, suppressed chondrocyte growth in vitro and affected recovery of damaged knee cartilage in vivo in the pig model. These results may be specific to the parameters used in this study and may not apply to other situations, field strengths, forms of cartilage injury, or animal species.
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Affiliation(s)
- C-H Hsieh
- Institute of Molecular Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan, ROC
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Schwenzer NF, Bantleon R, Maurer B, Kehlbach R, Schraml C, Claussen CD, Rodegerdts E. Do static or time-varying magnetic fields in magnetic resonance imaging (3.0 T) alter protein-gene expression?-A study on human embryonic lung fibroblasts. J Magn Reson Imaging 2008; 26:1210-5. [PMID: 17969170 DOI: 10.1002/jmri.21145] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
PURPOSE To evaluate the influence of magnetic resonance imaging (MRI) on gene expression in embryonic human lung fibroblasts (Hel 299). MATERIALS AND METHODS The cells were exposed to the static magnetic field and to a turbo spin-echo sequence of an MR scanner at 3.0 Tesla. An MR group (exposed) and a control group (sham-exposed) were set up using a special MR-compatible incubation system. The exposure time was two hours. Gene expression profiles were studied using a complementary deoxyribonucleic acid (cDNA) microarray containing 498 known genes involved in transcription, intracellular transport, structure/junction/adhesion or extracellular matrix, signaling, host defense, energetics, metabolism, cell shape, and death. RESULTS No changes in gene expression were found in either group (exposed or sham-exposed cells) at the end of a two-hour exposure for any of the 498 tested protein genes. CONCLUSION The results suggest that MRI has no influence on protein-gene expression in eugenic human lung cells.
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Affiliation(s)
- Nina F Schwenzer
- Department of Diagnostic Radiology, Eberhard-Karls University, Tübingen, Germany.
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Schwenzer NF, Bantleon R, Maurer B, Kehlbach R, Schraml C, Claussen CD, Rodegerdts E. Detection of DNA double-strand breaks using gammaH2AX after MRI exposure at 3 Tesla: an in vitro study. J Magn Reson Imaging 2008; 26:1308-14. [PMID: 17969164 DOI: 10.1002/jmri.21138] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
PURPOSE To evaluate the effects of the static magnetic field and typical imaging sequences of a high-field magnetic resonance scanner (3 Tesla) on the induction of double-strand breaks (DSBs) in two different human cell lines. MATERIALS AND METHODS Human promyelocytic leukemia cells (HL-60) and human acute myeloid leukemia cells (KG-1a) were exposed to the static magnetic field alone and to turbo spin-echo (TSE) and gradient-echo (GE) sequences. Flow cytometry was used to quantify gammaH2AX (serine 139 phosphorylated form of histone H2AX) expression of antibody-stained cells as a marker for deoxyribonucleic acid (DNA) DSBs one hour and 24 hours after magnetic field exposure. X-ray-treated cells were used as positive control. RESULTS Neither exposure to the static magnetic field alone nor to the applied imaging sequences showed significant differences in gammaH2AX expression between exposed and sham-exposed cells. X-ray-treated cells as positive control showed a significant increase in gammaH2AX expression. CONCLUSION The static magnetic field alone and MRI sequences at 3 Tesla have no effect on the induction of DSBs in HL-60 and KG-1a cells.
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Affiliation(s)
- Nina F Schwenzer
- Department of Diagnostic Radiology, Eberhard-Karls University, Tübingen, Germany.
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Schwenzer NF, Bantleon R, Maurer B, Kehlbach R, Herberts T, Claussen CD, Rodegerdts E. In vitro evaluation of magnetic resonance imaging at 3.0 tesla on clonogenic ability, proliferation, and cell cycle in human embryonic lung fibroblasts. Invest Radiol 2007; 42:212-7. [PMID: 17351426 DOI: 10.1097/01.rli.0000255831.40115.83] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES We investigated the influence of magnetic resonance (MR) at 3.0 T on clonogenic ability, proliferation, and cell cycle in an embryonic human cell line. MATERIALS AND METHODS Cells (human lung fibroblasts Hel 299) were exposed to the static magnetic field (3.0 T) of a magnetic resonance imager (MRI) and to a turbo spin echo sequence at 3.0 T within clinical limitations (specific absorption rate 0.92 W/kg). A special MR-compatible incubation system was used. A control group (sham-exposed) and a MRI group (exposed) were set up. We investigated 3 biologic endpoints: colony forming, cell cycle, and proliferation ability. The exposure time was 2 hours in each experiment. RESULTS In the statistical analysis, none of these tests showed relevant differences between the exposed and sham-exposed group. CONCLUSIONS No influences of the static field alone as well as a turbo spin echo sequence at 3.0 T on clonogenic ability, proliferation, or cell cycle in eugenic human lung fibroblasts were found.
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Affiliation(s)
- Nina F Schwenzer
- Department of Diagnostic Radiology, Eberhard-Karls University, Tübingen, Germany.
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Schwenk M, Sack U, Esser C, Klein R. Diagnostic relevance of the determination of lymphocyte subpopulations in environmental medicine. Int J Hyg Environ Health 2006; 210:177-98. [PMID: 17188021 DOI: 10.1016/j.ijheh.2006.10.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2006] [Accepted: 10/23/2006] [Indexed: 11/26/2022]
Abstract
Earlier hopes that determination of lymphocyte subpopulations might become a strong diagnostic tool in environmental medicine have not been fulfilled in recent years. Analysis of the scientific literature rather shows that there are only few examples for environmental exposures causing reproducible shifts of lymphocyte subpopulations. Moreover, current knowledge suggests that "environmental diseases" are not associated with characteristic changes of subpopulation patterns. If lymphocyte subpopulations are analyzed, each diagnostic step, including indication, sample handling, analytic procedure and data-interpretation, should adhere to good quality criteria. Taking all together, the determination of lymphocyte subpopulations in the context of environmental medicine comes under category IV of the criteria of the Commission for Methods and Quality Assurance in Environmental Medicine of the German federal health authority (Robert Koch-Institute; RKI): "A procedure cannot be recommended because there is not sufficient information to justify it" (here: no solid trends in epidemiological examinations), "and because theoretical considerations speak against an application" (here: high physiological variability and missing exposure or substance specificity).
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Affiliation(s)
- M Schwenk
- In den Kreuzäckern 16, 72072 Tübingen, Germany.
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Reale M, De Lutiis MA, Patruno A, Speranza L, Felaco M, Grilli A, Macrì MA, Comani S, Conti P, Di Luzio S. Modulation of MCP-1 and iNOS by 50-Hz sinusoidal electromagnetic field. Nitric Oxide 2006; 15:50-7. [PMID: 16455275 DOI: 10.1016/j.niox.2005.11.010] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2005] [Revised: 11/14/2005] [Accepted: 11/29/2005] [Indexed: 11/30/2022]
Abstract
The purpose of this study was to investigate whether overnight exposure to 1 mT-50 Hz extremely low-frequency sinusoidal electromagnetic field (EMF) affects the expression and production of inducible nitric oxide synthase (iNOS) and monocyte chemotactic protein-1 (MCP-1) in human monocytes. RT-PCR and Western blot analysis demonstrate that EMF exposure affects the expression of iNOS and MCP-1 in cultured human mononuclear cells at the mRNA level and protein synthesis. Interestingly, the effects of EMF exposure clearly differed with respect to the potentiation and inhibition of iNOS and MCP-1 expression. Whereas iNOS was down-regulated both at the mRNA level and at the protein level, MCP-1 was up-regulated. These results provide helpful information regarding the EMF-mediated modulation of the inflammatory response in vivo. However, additional studies are necessary to demonstrate that EMF acts as a nonpharmacological inhibitor of NO and inducer of MCP-1 in some diseases where the balance of MCP-1 and NO may be important.
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Affiliation(s)
- Marcella Reale
- Department of Oncology and Neuroscience, Universita degli Studi G.D'Annunzio, Chieti, Italy.
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Bedeutung der Bestimmung von Lymphozyten-Subpopulationen in der Umweltmedizin. Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz 2006. [DOI: 10.1007/s00103-006-1248-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Miyakoshi J. Effects of static magnetic fields at the cellular level. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2005; 87:213-23. [PMID: 15556660 DOI: 10.1016/j.pbiomolbio.2004.08.008] [Citation(s) in RCA: 188] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
There have been few studies on the effects of static magnetic fields at the cellular level, compared to those of extremely low frequency magnetic fields. Past studies have shown that a static magnetic field alone does not have a lethal effect on the basic properties of cell growth and survival under normal culture conditions, regardless of the magnetic density. Most but not all studies have also suggested that a static magnetic field has no effect on changes in cell growth rate. It has also been shown that cell cycle distribution is not influenced by extremely strong static magnetic fields (up to a maximum of 10 T). A further area of interest is whether static magnetic fields cause DNA damage, which can be evaluated by determination of the frequency of micronucleus formation. The presence or absence of such micronuclei can confirm whether a particular treatment damages cellular DNA. This method has been used to confirm that a static magnetic field alone has no such effect. However, the frequency of micronucleus formation increases significantly when certain treatments (e.g., X-irradiation) are given prior to exposure to a 10 T static magnetic field. It has also been reported that treatment with trace amounts of ferrous ions in the cell culture medium and exposure to a static magnetic field increases DNA damage, which is detected using the comet assay. In addition, many studies have found a strong magnetic field that can induce orientation phenomena in cell culture.
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Affiliation(s)
- Junji Miyakoshi
- Department of Radiological Technology, School of Health Sciences, Faculty of Medicine, Hirosaki University, 66-1 Hon-Cho, Hirosaki 036-8564, Japan.
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Courtemanche C, Elson-Schwab I, Mashiyama ST, Kerry N, Ames BN. Folate deficiency inhibits the proliferation of primary human CD8+ T lymphocytes in vitro. THE JOURNAL OF IMMUNOLOGY 2004; 173:3186-92. [PMID: 15322179 DOI: 10.4049/jimmunol.173.5.3186] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Folate is required for one-carbon transfer reactions and the formation of purines and pyrimidines for DNA and RNA synthesis. Deficiency of folate can lead to many clinical abnormalities, including macrocytic anemia, cardiovascular diseases, birth defects, and carcinogenesis. The nucleotide imbalance due to folate deficiency causes cell cycle arrest in the S phase and uracil misincorporation into DNA, which may result in DNA double-strand breaks during repair. The role of folate in the immune system has not been fully characterized. We cultured PHA-activated human T lymphocytes in varying concentrations of folate, and measured proliferation, cell cycle, apoptosis, uracil misincorporation, and proportions of Th cells (CD4(+)) and cytotoxic T (CD8(+)) cells. Folate deficiency reduced proliferation of T lymphocytes, induced cell cycle arrest in the S phase, induced apoptosis, and increased the level of uracil in DNA. Folate deficiency also increased the CD4(+) to CD8(+) ratio due to a marked reduction of CD8(+) cell proliferation. Folate or nucleoside repletion of folate-deficient cells rapidly restored T lymphocyte proliferation and normal cell cycle, reduced the DNA uracil content, and lowered the CD4(+) to CD8(+) ratio. These data suggest that folate status may affect the immune system by reducing the capacity of CD8(+) cells to proliferate in response to activation.
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Affiliation(s)
- Chantal Courtemanche
- University of California, Berkeley, and Children's Hospital Oakland Research Institute, Oakland, CA 94609, USA
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