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Tota M, Jonderko L, Witek J, Novickij V, Kulbacka J. Cellular and Molecular Effects of Magnetic Fields. Int J Mol Sci 2024; 25:8973. [PMID: 39201657 PMCID: PMC11354277 DOI: 10.3390/ijms25168973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2024] [Revised: 08/09/2024] [Accepted: 08/14/2024] [Indexed: 09/02/2024] Open
Abstract
Recently, magnetic fields (MFs) have received major attention due to their potential therapeutic applications and biological effects. This review provides a comprehensive analysis of the cellular and molecular impacts of MFs, with a focus on both in vitro and in vivo studies. We investigate the mechanisms by which MFs influence cell behavior, including modifications in gene expression, protein synthesis, and cellular signaling pathways. The interaction of MFs with cellular components such as ion channels, membranes, and the cytoskeleton is analyzed, along with their effects on cellular processes like proliferation, differentiation, and apoptosis. Molecular insights are offered into how MFs modulate oxidative stress and inflammatory responses, which are pivotal in various pathological conditions. Furthermore, we explore the therapeutic potential of MFs in regenerative medicine, cancer treatment, and neurodegenerative diseases. By synthesizing current findings, this article aims to elucidate the complex bioeffects of MFs, thereby facilitating their optimized application in medical and biotechnological fields.
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Affiliation(s)
- Maciej Tota
- Student Research Group № K148, Faculty of Medicine, Wroclaw Medical University, 50-367 Wroclaw, Poland;
| | - Laura Jonderko
- Student Research Group № K148, Faculty of Pharmacy, Wroclaw Medical University, 50-367 Wroclaw, Poland; (L.J.); (J.W.)
| | - Julia Witek
- Student Research Group № K148, Faculty of Pharmacy, Wroclaw Medical University, 50-367 Wroclaw, Poland; (L.J.); (J.W.)
| | - Vitalij Novickij
- Institute of High Magnetic Fields, Vilnius Gediminas Technical University, LT-03227 Vilnius, Lithuania;
- Department of Immunology, State Research Institute Centre for Innovative Medicine, Santariškių 5, LT-08410 Vilnius, Lithuania
| | - Julita Kulbacka
- Department of Immunology, State Research Institute Centre for Innovative Medicine, Santariškių 5, LT-08410 Vilnius, Lithuania
- Department of Molecular and Cellular Biology, Faculty of Pharmacy, Wroclaw Medical University, 50-367 Wrocław, Poland
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Minuti AE, Labusca L, Herea DD, Stoian G, Chiriac H, Lupu N. A Simple Protocol for Sample Preparation for Scanning Electron Microscopic Imaging Allows Quick Screening of Nanomaterials Adhering to Cell Surface. Int J Mol Sci 2022; 24:ijms24010430. [PMID: 36613905 PMCID: PMC9820490 DOI: 10.3390/ijms24010430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 12/21/2022] [Accepted: 12/22/2022] [Indexed: 12/29/2022] Open
Abstract
Preparing biological specimens for scanning electron microscopy (SEM) can be difficult to implement, as it requires specialized equipment and materials as well as the training of dedicated personnel. Moreover, the procedure often results in damage to the samples to be analyzed. This work presents a protocol for the preparation of biological samples to evaluate the adherence of nanomaterials on the cell surface using SEM. To this end, we used silicon wafers as a substrate to grow cells and replaced difficult steps such as the critical point drying of the samples in order to make the method quicker and easier to perform. The new protocol was tested using two different types of cells, i.e., human osteosarcoma cells and adipose-derived mesenchymal stem cells, and it proved that it can grossly preserve cell integrity in order to be used to estimate nanomaterials' interaction with cell surfaces.
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Affiliation(s)
- Anca Emanuela Minuti
- National Institute of Research and Development for Technical Physics, 700050 Iasi, Romania
- Faculty of Physics, Alexandru Ioan Cuza University, 700506 Iasi, Romania
| | - Luminita Labusca
- National Institute of Research and Development for Technical Physics, 700050 Iasi, Romania
| | - Dumitru-Daniel Herea
- National Institute of Research and Development for Technical Physics, 700050 Iasi, Romania
| | - George Stoian
- National Institute of Research and Development for Technical Physics, 700050 Iasi, Romania
| | - Horia Chiriac
- National Institute of Research and Development for Technical Physics, 700050 Iasi, Romania
- Correspondence:
| | - Nicoleta Lupu
- National Institute of Research and Development for Technical Physics, 700050 Iasi, Romania
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Magnetic nanowires substrate increases adipose-derived mesenchymal cells osteogenesis. Sci Rep 2022; 12:16698. [PMID: 36202902 PMCID: PMC9537172 DOI: 10.1038/s41598-022-21145-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Accepted: 09/22/2022] [Indexed: 11/08/2022] Open
Abstract
Magnetic nanomaterials are increasingly impacting the field of biology and medicine. Their versatility in terms of shape, structure, composition, coating, and magnetic responsivity make them attractive for drug delivery, cell targeting and imaging. Adipose derived-mesenchymal cells (ASCs) are intensely scrutinized for tissue engineering and regenerative medicine. However, differentiation into musculoskeletal lineages can be challenging. In this paper, we show that uncoated nickel nanowires (Ni NW) partially released from their alumina membrane offer a mechanically-responsive substrate with regular topography that can be used for the delivery of magneto-mechanical stimulation. We have used a tailored protocol for improving ASCs adherence to the substrate, and showed that cells retain their characteristic fibroblastic appearance, cytoskeletal fiber distribution and good viability. We report here for the first time significant increase in osteogenic but not adipogenic differentiation of ASCs on Ni NW exposed to 4 mT magnetic field compared to non-exposed. Moreover, magnetic actuation is shown to induce ASCs osteogenesis but not adipogenesis in the absence of external biochemical cues. While these findings need to be verified in vivo, the use of Ni NW substrate for inducing osteogenesis in the absence of specific differentiation factors is attractive for bone engineering. Implant coating with similar surfaces for orthopedic and dentistry could be as well envisaged as a modality to improve osteointegration.
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Perez JE, Bajaber B, Alsharif N, Martínez-Banderas AI, Patel N, Sharip A, Di Fabrizio E, Merzaban J, Kosel J. Modulated nanowire scaffold for highly efficient differentiation of mesenchymal stem cells. J Nanobiotechnology 2022; 20:282. [PMID: 35710420 PMCID: PMC9202102 DOI: 10.1186/s12951-022-01488-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 05/31/2022] [Indexed: 12/18/2022] Open
Abstract
Background Nanotopographical cues play a critical role as drivers of mesenchymal stem cell differentiation. Nanowire scaffolds, in this regard, provide unique and adaptable nanostructured surfaces with focal points for adhesion and with elastic properties determined by nanowire stiffness. Results We show that a scaffold of nanowires, which are remotely actuated by a magnetic field, mechanically stimulates mesenchymal stem cells. Osteopontin, a marker of osteogenesis onset, was expressed after cells were cultured for 1 week on top of the scaffold. Applying a magnetic field significantly boosted differentiation due to mechanical stimulation of the cells by the active deflection of the nanowire tips. The onset of differentiation was reduced to 2 days of culture based on the upregulation of several osteogenesis markers. Moreover, this was observed in the absence of any external differentiation factors. Conclusions The magneto-mechanically modulated nanosurface enhanced the osteogenic differentiation capabilities of mesenchymal stem cells, and it provides a customizable tool for stem cell research and tissue engineering. Graphical Abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s12951-022-01488-5.
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Affiliation(s)
- Jose E Perez
- Bioscience Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Bashaer Bajaber
- Bioscience Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Nouf Alsharif
- Bioscience Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Aldo I Martínez-Banderas
- Bioscience Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Niketan Patel
- Electrical and Computer Engineering Program, Computer, Electrical and Mathematical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Ainur Sharip
- Bioscience Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Enzo Di Fabrizio
- Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, Corso Duca Degli Abruzzi 24, 10129, Turin, Italy
| | - Jasmeen Merzaban
- Bioscience Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.
| | - Jürgen Kosel
- Electrical and Computer Engineering Program, Computer, Electrical and Mathematical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia. .,Division of Sensor Systems, Silicon Austria Labs, High Tech Campus Villach, 9524, Villach, Austria.
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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: 10] [Impact Index Per Article: 2.5] [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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Moussi K, Abusamra DB, Yassine O, Merzaban J, Kosel J. Strain-induced Differentiation of Mesenchymal Stem Cells. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2020; 2020:2239-2244. [PMID: 33018453 DOI: 10.1109/embc44109.2020.9176273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Directing the fate of human mesenchymal stem/stromal cells (hMSCs) toward bone formation using mechanical strain is a promising approach in regenerative medicine related to bone diseases. Numerous studies have evaluated the effects of vibration or cyclic tensile strain on MSCs towards developing a mechanically-based method for stimulating differentiation. Here, we study the differentiation of hMSCs cultured on elastic polydimethylsiloxane (PDMS) membrane, which is magnetically actuated to induce periodically varying strain. The strain distribution across the membrane was calculated by finite-element modeling and demonstrates three main areas of different strain amplitudes. The strain effect on the hMSCs was evaluated by measuring the mineralization of differentiated hMSCs using Alizarin S red stain. The results indicate a strain-dependent differentiation of hMSCs, where the highest region of strain on the membrane resulted in the most accelerated differentiation. Osteogenic differentiation was achieved as early as two weeks, which is significantly sooner than control hMSCs treated with osteogenic media alone.
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Martínez-Banderas AI, Aires A, Plaza-García S, Colás L, Moreno JA, Ravasi T, Merzaban JS, Ramos-Cabrer P, Cortajarena AL, Kosel J. Magnetic core-shell nanowires as MRI contrast agents for cell tracking. J Nanobiotechnology 2020; 18:42. [PMID: 32164746 PMCID: PMC7069006 DOI: 10.1186/s12951-020-00597-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 02/27/2020] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Identifying the precise location of cells and their migration dynamics is of utmost importance for achieving the therapeutic potential of cells after implantation into a host. Magnetic resonance imaging is a suitable, non-invasive technique for cell monitoring when used in combination with contrast agents. RESULTS This work shows that nanowires with an iron core and an iron oxide shell are excellent materials for this application, due to their customizable magnetic properties and biocompatibility. The longitudinal and transverse magnetic relaxivities of the core-shell nanowires were evaluated at 1.5 T, revealing a high performance as T2 contrast agents. Different levels of oxidation and various surface coatings were tested at 7 T. Their effects on the T2 contrast were reflected in the tailored transverse relaxivities. Finally, the detection of nanowire-labeled breast cancer cells was demonstrated in T2-weighted images of cells implanted in both, in vitro in tissue-mimicking phantoms and in vivo in mouse brain. Labeling the cells with a nanowire concentration of 0.8 μg of Fe/mL allowed the detection of 25 cells/µL in vitro, diminishing the possibility of side effects. This performance enabled an efficient labelling for high-resolution cell detection after in vivo implantation (~ 10 nanowire-labeled cells) over a minimum of 40 days. CONCLUSIONS Iron-iron oxide core-shell nanowires enabled the efficient and longitudinal cellular detection through magnetic resonance imaging acting as T2 contrast agents. Combined with the possibility of magnetic guidance as well as triggering of cellular responses, for instance by the recently discovered strong photothermal response, opens the door to new horizons in cell therapy and make iron-iron oxide core-shell nanowires a promising theranostic platform.
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Affiliation(s)
- Aldo Isaac Martínez-Banderas
- Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Jeddah, 23955-6900, Saudi Arabia
| | - Antonio Aires
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, 20014, Donostia San Sebastián, Spain
| | - Sandra Plaza-García
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, 20014, Donostia San Sebastián, Spain
| | - Lorena Colás
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, 20014, Donostia San Sebastián, Spain
| | - Julián A Moreno
- Division of Computer, Electrical and Mathematical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Jeddah, 23955-6900, Saudi Arabia
| | - Timothy Ravasi
- Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Jeddah, 23955-6900, Saudi Arabia
| | - Jasmeen S Merzaban
- Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Jeddah, 23955-6900, Saudi Arabia
| | - Pedro Ramos-Cabrer
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, 20014, Donostia San Sebastián, Spain.
- Ikerbasque, Basque Foundation for Science, Mª Díaz de Haro 3, 48013, Bilbao, Spain.
| | - Aitziber L Cortajarena
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, 20014, Donostia San Sebastián, Spain.
- Ikerbasque, Basque Foundation for Science, Mª Díaz de Haro 3, 48013, Bilbao, Spain.
- IMDEA Nanociencia and Nanobiotechnology Unit Associated to Centro Nacional de Biotecnología (CNB-CSIC), Campus Universitario de Cantoblanco, 28049, Madrid, Spain.
| | - Jürgen Kosel
- Division of Computer, Electrical and Mathematical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Jeddah, 23955-6900, Saudi Arabia.
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Ivanov YP, Leliaert J, Crespo A, Pancaldi M, Tollan C, Kosel J, Chuvilin A, Vavassori P. Design of Intense Nanoscale Stray Fields and Gradients at Magnetic Nanorod Interfaces. ACS APPLIED MATERIALS & INTERFACES 2019; 11:4678-4685. [PMID: 30607950 DOI: 10.1021/acsami.8b19873] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We explore electrodeposited ordered arrays of Fe, Ni, and Co nanorods embedded in anodic alumina membranes as a source of intense magnetic stray field gradients localized at the nanoscale. We perform a multiscale characterization of the stray fields using a combination of experimental methods (magnetooptical Kerr effect and virtual bright field differential phase contrast imaging) and micromagnetic simulations and establish a clear correlation between the stray fields and the magnetic configurations of the nanorods. For uniformly magnetized Fe and Ni wires, the field gradients vary following saturation magnetization of the corresponding metal and the diameter of the wires. In the case of Co nanorods, very localized (∼10 nm) and intense (>1 T) stray field sources are associated with the cores of magnetic vortexes. Confinement of that strong field at extremely small dimensions leads to exceptionally high field gradients up to 108 T/m. These results demonstrate a clear path to design and fine-tune nanoscale magnetic stray field ordered patterns with a broad applicability in key nanotechnologies, such as nanomedicine, nanobiology, nanoplasmonics, and sensors.
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Affiliation(s)
- Yurii P Ivanov
- Department of Materials Science & Metallurgy , University of Cambridge , Cambridge CB3 0FS , U.K
- School of Natural Sciences , Far Eastern Federal University , 690950 Vladivostok , Russia
| | - Jonathan Leliaert
- Department of Solid State Sciences , Ghent University , BE9000 Ghent , Belgium
| | - Adrian Crespo
- CIC nanoGUNE Consolider , Av. de Tolosa 76 , 20018 San Sebastian , Spain
| | - Matteo Pancaldi
- CIC nanoGUNE Consolider , Av. de Tolosa 76 , 20018 San Sebastian , Spain
| | - Christopher Tollan
- CIC nanoGUNE Consolider , Av. de Tolosa 76 , 20018 San Sebastian , Spain
| | - Jurgen Kosel
- King Abdullah University of Science and Technology , Thuwal 23955 , Saudi Arabia
| | - Andrey Chuvilin
- CIC nanoGUNE Consolider , Av. de Tolosa 76 , 20018 San Sebastian , Spain
- IKERBASQUE, Basque Foundation for Science , Maria Diaz de Haro 3 , 48013 Bilbao , Spain
| | - Paolo Vavassori
- CIC nanoGUNE Consolider , Av. de Tolosa 76 , 20018 San Sebastian , Spain
- IKERBASQUE, Basque Foundation for Science , Maria Diaz de Haro 3 , 48013 Bilbao , Spain
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Zablotskii V, Polyakova T, Dejneka A. Cells in the Non-Uniform Magnetic World: How Cells Respond to High-Gradient Magnetic Fields. Bioessays 2018; 40:e1800017. [PMID: 29938810 DOI: 10.1002/bies.201800017] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 05/11/2018] [Indexed: 12/21/2022]
Abstract
Imagine cells that live in a high-gradient magnetic field (HGMF). Through what mechanisms do the cells sense a non-uniform magnetic field and how such a field changes the cell fate? We show that magnetic forces generated by HGMFs can be comparable to intracellular forces and therefore may be capable of altering the functionality of an individual cell and tissues in unprecedented ways. We identify the cellular effectors of such fields and propose novel routes in cell biology predicting new biological effects such as magnetic control of cell-to-cell communication and vesicle transport, magnetic control of intracellular ROS levels, magnetically induced differentiation of stem cells, magnetically assisted cell division, or prevention of cells from dividing. On the basis of experimental facts and theoretical modeling we reveal timescales of cellular responses to high-gradient magnetic fields and suggest an explicit dependence of the cell response time on the magnitude of the magnetic field gradient.
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Affiliation(s)
- Vitalii Zablotskii
- Institute of Physics of the Czech Academy of Sciences, Prague 18221, Czech Republic
| | - Tatyana Polyakova
- Institute of Physics of the Czech Academy of Sciences, Prague 18221, Czech Republic
| | - Alexandr Dejneka
- Institute of Physics of the Czech Academy of Sciences, Prague 18221, Czech Republic
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