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Carvalho EO, Ribeiro C, Correia DM, Botelho G, Lanceros-Mendez S. Biodegradable Hydrogels Loaded with Magnetically Responsive Microspheres as 2D and 3D Scaffolds. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E2421. [PMID: 33287454 PMCID: PMC7761810 DOI: 10.3390/nano10122421] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 11/13/2020] [Accepted: 11/28/2020] [Indexed: 12/21/2022]
Abstract
Scaffolds play an essential role in the success of tissue engineering approaches. Their intrinsic properties are known to influence cellular processes such as adhesion, proliferation and differentiation. Hydrogel-based matrices are attractive scaffolds due to their high-water content resembling the native extracellular matrix. In addition, polymer-based magnetoelectric materials have demonstrated suitable bioactivity, allowing to provide magnetically and mechanically activated biophysical electrical stimuli capable of improving cellular processes. The present work reports on a responsive scaffold based on poly (L-lactic acid) (PLLA) microspheres and magnetic microsphere nanocomposites composed of PLLA and magnetostrictive cobalt ferrites (CoFe2O4), combined with a hydrogel matrix, which mimics the tissue's hydrated environment and acts as a support matrix. For cell proliferation evaluation, two different cell culture conditions (2D and 3D matrices) and two different strategies, static and dynamic culture, were applied in order to evaluate the influence of extracellular matrix-like confinement and the magnetoelectric/magneto-mechanical effect on cellular behavior. MC3T3-E1 proliferation rate is increased under dynamic conditions, indicating the potential use of hydrogel matrices with remotely stimulated magnetostrictive biomaterials for bone tissue engineering.
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Affiliation(s)
- Estela O. Carvalho
- Centre of Physics, University of Minho, 4710-057 Braga, Portugal; (E.O.C.); (D.M.C.)
- Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal
| | - Clarisse Ribeiro
- Centre of Physics, University of Minho, 4710-057 Braga, Portugal; (E.O.C.); (D.M.C.)
- Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal
| | - Daniela M. Correia
- Centre of Physics, University of Minho, 4710-057 Braga, Portugal; (E.O.C.); (D.M.C.)
- Departamento de Química e CQ-VR, Universidade de Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal
| | - Gabriela Botelho
- Centro de Química, Universidade do Minho, 4710-057 Braga, Portugal;
| | - Senentxu Lanceros-Mendez
- BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain;
- IKERBASQUE, Basque Foundation for Science, 48009 Bilbao, Spain
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Castro N, Ribeiro S, Fernandes MM, Ribeiro C, Cardoso V, Correia V, Minguez R, Lanceros‐Mendez S. Physically Active Bioreactors for Tissue Engineering Applications. ACTA ACUST UNITED AC 2020; 4:e2000125. [DOI: 10.1002/adbi.202000125] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 07/15/2020] [Indexed: 01/09/2023]
Affiliation(s)
- N. Castro
- BCMaterials, Basque Centre for Materials, Applications and Nanostructures University of the Basque Country UPV/EHU Science Park Leioa E‐48940 Spain
| | - S. Ribeiro
- Physics Centre University of Minho Campus de Gualtar Braga 4710‐057 Portugal
- Centre of Molecular and Environmental Biology (CBMA) University of Minho Campus de Gualtar Braga 4710‐057 Portugal
| | - M. M. Fernandes
- Physics Centre University of Minho Campus de Gualtar Braga 4710‐057 Portugal
- CEB – Centre of Biological Engineering University of Minho Braga 4710‐057 Portugal
| | - C. Ribeiro
- Physics Centre University of Minho Campus de Gualtar Braga 4710‐057 Portugal
- CEB – Centre of Biological Engineering University of Minho Braga 4710‐057 Portugal
| | - V. Cardoso
- CMEMS‐UMinho Universidade do Minho Campus de Azurém Guimarães 4800‐058 Portugal
| | - V. Correia
- Algoritmi Research Centre University of Minho Campus de Azurém Guimarães 4800‐058 Portugal
| | - R. Minguez
- Department of Graphic Design and Engineering Projects University of the Basque Country UPV/EHU Bilbao E‐48013 Spain
| | - S. Lanceros‐Mendez
- BCMaterials, Basque Centre for Materials, Applications and Nanostructures University of the Basque Country UPV/EHU Science Park Leioa E‐48940 Spain
- IKERBASQUE Basque Foundation for Science Bilbao E‐48013 Spain
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Agrawal RK, Pandey V, Barhanpurkar-Naik A, Wani MR, Chattopadhyay K, Singh V. Effect of ultrasonic shot peening duration on microstructure, corrosion behavior and cell response of cp-Ti. ULTRASONICS 2020; 104:106110. [PMID: 32146383 DOI: 10.1016/j.ultras.2020.106110] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 11/10/2019] [Accepted: 02/10/2020] [Indexed: 06/10/2023]
Abstract
Surface mechanical attrition treatment (SMAT) of metallic biomaterials has gained significant importance due to its ability to develop nano structure in the surface region. In the present study, the microstructural changes and corrosion behavior of the commercially pure titanium (cp-Ti), following different durations of ultrasonic shot peening (USSP) has been investigated. cp-Ti was shot peened for different durations from 0 to 120 s and the treated samples were examined for microstructural changes in the surface region, cell viability and corrosion behavior. Cell viability was considerably increased after USSP for 60-120 s, exhibiting maximum for the 90 s of USSP. The passivation tendency was also improved with peening duration up to 90 s, however, it declined for longer duration of USSP. The beneficial effects of USSP may be attributed to nano structuring in the surface region and development of higher positive potentials at the USSP treated surface. Transmission Electron Microscope (TEM) examination of the USSPed surface revealed dislocation entanglement and substructure. Also, higher surface volta potential was observed over the USSPed sample exhibiting better cell proliferation. The present work is corollary to previous work of the group and mainly discusses the role of USSP duration, as a process parameter, on the cell viability and corrosion resistance of cp-Ti.
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Affiliation(s)
- Rahul Kumar Agrawal
- Department of Metallurgical Engineering, Indian Institute of Technology (B.H.U.), Varanasi 221005, Uttar Pradesh, India
| | - Vaibhav Pandey
- Department of Metallurgical Engineering, Indian Institute of Technology (B.H.U.), Varanasi 221005, Uttar Pradesh, India
| | | | - Mohan R Wani
- Bone Research Laboratory, National Centre for Cell Science, Pune 411007, Maharashtra, India
| | - Kausik Chattopadhyay
- Department of Metallurgical Engineering, Indian Institute of Technology (B.H.U.), Varanasi 221005, Uttar Pradesh, India
| | - Vakil Singh
- Department of Metallurgical Engineering, Indian Institute of Technology (B.H.U.), Varanasi 221005, Uttar Pradesh, India.
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Fernandes MM, Correia DM, Ribeiro C, Castro N, Correia V, Lanceros-Mendez S. Bioinspired Three-Dimensional Magnetoactive Scaffolds for Bone Tissue Engineering. ACS APPLIED MATERIALS & INTERFACES 2019; 11:45265-45275. [PMID: 31682095 DOI: 10.1021/acsami.9b14001] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Bone tissue repair strategies are gaining increasing relevance due to the growing incidence of bone disorders worldwide. Biochemical stimulation is the most commonly used strategy for cell regeneration, while the application of physical cues, including magnetic, mechanical, or electrical fields, is a promising, however, scarcely investigated field. This work reports on novel magnetoactive three-dimensional (3D) porous scaffolds suitable for effective proliferation of osteoblasts in a biomimetic microenvironment. This physically active microenvironment is developed through the bone-mimicking structure of the scaffold combined with the physical stimuli provided by a magnetic custom-made bioreactor on a magnetoresponsive scaffold. Scaffolds are obtained through the development of nanocomposites comprised of a piezoelectric polymer, poly(vinylidene fluoride) (PVDF), and magnetostrictive particles of CoFe2O4, using a solvent casting method guided by the overlapping of nylon template structures with three different fiber diameter sizes (60, 80, and 120 μm), thus generating 3D scaffolds with different pore sizes. The magnetoactive composites show a structure very similar to trabecular bone with pore sizes that range from 5 to 20 μm, owing to the inherent process of crystallization of PVDF with the nanoparticles (NPs), interconnected with bigger pores, formed after removing the nylon templates. It is found that the materials crystallize in the electroactive β-phase of PVDF and promote the proliferation of preosteoblasts through the application of magnetic stimuli. This phenomenon is attributed to both local magnetomechanical and magnetoelectric response of the scaffolds, which induce a proper cellular mechano- and electro-transduction process.
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Affiliation(s)
- Margarida M Fernandes
- Centre of Biological Engineering , University of Minho , Campus de Gualtar , Braga 4710-057 , Portugal
- Centre of Physics , University of Minho , Braga 4710-057 , Portugal
| | - Daniela M Correia
- Centre of Physics , University of Minho , Braga 4710-057 , Portugal
- Centro de Química , Universidade de Trás-os-Montes e Alto Douro , Vila Real 5001-801 , Portugal
| | - Clarisse Ribeiro
- Centre of Biological Engineering , University of Minho , Campus de Gualtar , Braga 4710-057 , Portugal
- Centre of Physics , University of Minho , Braga 4710-057 , Portugal
| | - Nelson Castro
- BCMaterials, Basque Center for Materials, Applications and Nanostructures , UPV/EHU Science Park , Leioa 48940 , Spain
| | - Vitor Correia
- Centro Algoritmi , Universidade do Minho , Guimarães 4800-058 , Portugal
| | - Senentxu Lanceros-Mendez
- BCMaterials, Basque Center for Materials, Applications and Nanostructures , UPV/EHU Science Park , Leioa 48940 , Spain
- Ikerbasque, Basque Foundation for Science , Bilbao 48013 , Spain
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KOYAMA S, NISHI S, NAGANO Y, TAME A, UEMATSU K, NOGI Y, HATADA Y, TSUBOUCHI T. Electrical Retrieval of Living Streptomycete Spores Using a Potential-Controlled ITO Electrode. ELECTROCHEMISTRY 2017. [DOI: 10.5796/electrochemistry.85.297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
| | - Shinro NISHI
- Research and Development Center for Marine Biosciences, Japan Agency for Marine-Earth Science and Technology
| | - Yuriko NAGANO
- Department of Marine Biodiversity Research, Japan Agency for Marine-Earth Science and Technology
| | - Akihiro TAME
- Department of Marine and Science, Marine Works Japan, Ltd
| | | | - Yuichi NOGI
- Research and Development Center for Marine Biosciences, Japan Agency for Marine-Earth Science and Technology
| | - Yuji HATADA
- Department of Life Science and Green Chemistry, Saitama Institute of Technology
| | - Taishi TSUBOUCHI
- Research and Development Center for Marine Biosciences, Japan Agency for Marine-Earth Science and Technology
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Study of cellular dynamics on polarized CoCrMo alloy using time-lapse live-cell imaging. Acta Biomater 2013; 9:9220-8. [PMID: 23831720 DOI: 10.1016/j.actbio.2013.06.040] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Revised: 06/21/2013] [Accepted: 06/24/2013] [Indexed: 12/22/2022]
Abstract
The physico-chemical processes and phenomena occurring at the interface of metallic biomedical implants and the body dictate their successful integration in vivo. Changes in the surface potential and the associated redox reactions at metallic implants can significantly influence several aspects of biomaterial/cell interactions such as cell adhesion and survival in vitro. Accordingly, there is a voltage viability range (voltages which do not compromise cellular viability of the cells cultured on the polarized metal) for metallic implants. We report on cellular dynamics (size, polarity, movement) and temporal changes in the number and total area of focal adhesion complexes in transiently transfected MC3T3-E1 pre-osteoblasts cultured on CoCrMo alloy surfaces polarized at the cathodic and anodic edges of its voltage viability range (-400 and +500 mV (Ag/AgCl), respectively). Nucleus dynamics (size, circularity, movement) and the release of reactive oxygen species (ROS) were also studied on the polarized metal at -1000, -400 and +500 mV (Ag/AgCl). Our results show that at -400 mV, where reduction reactions dominate, a gradual loss of adhesion occurs over 24 h while cells shrink in size during this time. At +500 mV, where oxidation reactions dominate (i.e. metal ions form, including Cr6+), cells become non-viable after 5h without showing any significant changes in adhesion behavior right before cell death. Nucleus size of cells at -1000 mV decreased sharply within 15 min after polarization, which rendered the cells completely non-viable. No significant amount of ROS release by cells was detected on the polarized CoCrMo at any of these voltages.
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Tamplenizza M, Lenardi C, Maffioli E, Nonnis S, Negri A, Forti S, Sogne E, De Astis S, Matteoli M, Schulte C, Milani P, Tedeschi G. Nitric oxide synthase mediates PC12 differentiation induced by the surface topography of nanostructured TiO2. J Nanobiotechnology 2013; 11:35. [PMID: 24119372 PMCID: PMC3815074 DOI: 10.1186/1477-3155-11-35] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Accepted: 09/02/2013] [Indexed: 12/12/2022] Open
Abstract
Background Substrate nanoscale topography influences cell proliferation and differentiation through mechanisms that are at present poorly understood. In particular the molecular mechanism through which cells 'sense’ and adapt to the substrate and activate specific intracellular signals, influencing cells survival and behavior, remains to be clarified. Results To characterize these processes at the molecular level we studied the differentiation of PC12 cells on nanostructured TiO2 films obtained by supersonic cluster beam deposition. Our findings indicate that, in PC12 cells grown without Nerve Growth Factor (NGF), the roughness of nanostructured TiO2 triggers neuritogenesis by activating the expression of nitric oxide synthase (NOS) and the phospho-extracellular signal-regulated kinase 1/2 (pERK1/2) signaling. Differentiation is associated with an increase in protein nitration as observed in PC12 cells grown on flat surfaces in the presence of NGF. We demonstrate that cell differentiation and protein nitration induced by topography are not specific for PC12 cells but can be regarded as generalized effects produced by the substrate on different neuronal-like cell types, as shown by growing the human neuroblastoma SH-SY5Y cell line on nanostructured TiO2. Conclusion Our data provide the evidence that the nitric oxide (NO) signal cascade is involved in the differentiation process induced by nanotopography, adding new information on the mechanism and proteins involved in the neuritogenesis triggered by the surface properties.
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Affiliation(s)
- Margherita Tamplenizza
- CIMAINA and Dipartimento di Fisica, Università degli Studi di Milano, via Celoria 16, Milano 20133, Italy.
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Haeri M, Wӧllert T, Langford GM, Gilbert JL. Electrochemical control of cell death by reduction-induced intrinsic apoptosis and oxidation-induced necrosis on CoCrMo alloy in vitro. Biomaterials 2012; 33:6295-304. [DOI: 10.1016/j.biomaterials.2012.05.054] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2012] [Accepted: 05/20/2012] [Indexed: 01/01/2023]
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Cutaneous Magnetic Stimulation Reduces Rat Chronic Pain via Activation of the Supra-Spinal Descending Pathway. Cell Mol Neurobiol 2011; 32:245-53. [DOI: 10.1007/s10571-011-9756-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2011] [Accepted: 09/05/2011] [Indexed: 11/26/2022]
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10
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Koyama S. Electrically modulated attachment and detachment of animal cells cultured on an optically transparent patterning electrode. J Biosci Bioeng 2011; 111:574-83. [DOI: 10.1016/j.jbiosc.2010.12.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2010] [Revised: 12/28/2010] [Accepted: 12/30/2010] [Indexed: 10/18/2022]
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Lamour G, Journiac N, Souès S, Bonneau S, Nassoy P, Hamraoui A. Influence of surface energy distribution on neuritogenesis. Colloids Surf B Biointerfaces 2009; 72:208-18. [PMID: 19419846 DOI: 10.1016/j.colsurfb.2009.04.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2009] [Revised: 03/18/2009] [Accepted: 04/03/2009] [Indexed: 01/11/2023]
Abstract
PC12 cells are a useful model to study neuronal differentiation, as they can undergo terminal differentiation, typically when treated with nerve growth factor (NGF). In this study we investigated the influence of surface energy distribution on PC12 cell differentiation, by atomic force microscopy (AFM) and immunofluorescence. Glass surfaces were modified by chemisorption: an aminosilane, n-[3-(trimethoxysilyl)propyl]ethylendiamine (C(8)H(22)N(2)O(3)Si; EDA), was grafted by polycondensation. AFM analysis of substrate topography showed the presence of aggregates suggesting that the adsorption is heterogeneous, and generates local gradients in energy of adhesion. PC12 cells cultured on these modified glass surfaces developed neurites in absence of NGF treatment. In contrast, PC12 cells did not grow neurites when cultured in the absence of NGF on a relatively smooth surface such as poly-L-lysine substrate, where amine distribution is rather homogeneous. These results suggest that surface energy distribution, through cell-substrate interactions, triggers mechanisms that will drive PC12 cells to differentiate and to initiate neuritogenesis. We were able to create a controlled physical nano-structuration with local variations in surface energy that allowed the study of these parameters on neuritogenesis.
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Affiliation(s)
- Guillaume Lamour
- Laboratoire de Neuro-Physique Cellulaire, EA 3817, UFR Biomédicale, Université Paris Descartes, 45 rue des Saints-Pères, 75270 Paris Cedex 06, France
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TOMINAGA M, NAGAISHI S, KUMAGAI E, HARADA S, TANIGUCHI I. Effects of the Expansion Time of Alternating Potential Loading and Temperature on Cell Membrane Damage in HeLa Cells Cultured on an Electrode Surface. ELECTROCHEMISTRY 2008. [DOI: 10.5796/electrochemistry.76.538] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Kumagai E, Tominaga M, Nagaishi S, Harada S. Effect of electrical stimulation on human immunodeficiency virus type-1 infectivity. Appl Microbiol Biotechnol 2007; 77:947-53. [PMID: 17940763 DOI: 10.1007/s00253-007-1214-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2007] [Revised: 09/12/2007] [Accepted: 09/16/2007] [Indexed: 10/22/2022]
Abstract
We examined the effects of electrical stimulation on HIV-1-adsorbed MAGIC-5 (MAGIC-5/HIV-1) cells and unadsorbed MAGIC-5 (MAGIC-5) cells. When MAGIC-5 cells were stimulated by a constant d.c. potential of 1.0 V (vs Ag/Agcl) immediately after HIV-1(LAI) infection, infectivity was more affected by electrical stimulation than by cell membrane damage. In particular, after application of potential at 1.0 V for 5 min, about 1% of the membranes of the MAGIC-5/HIV-1(LAI) cells were damaged, but the infectivities of both HIV-1(LAI) and HIV-1(NL43-luc) cells decreased about 37 and 44%, respectively (p < 0.05). After application of potential at 1.0 V for 5 min, the mean fluorescence intensities (MFIs) of highly reactive oxygen species (hROS) and nitric oxide (NO) in MAGIC-5/HIV-1(NL43-Luc) cells were significantly increased compared with that of unstimulated MAGIC-5/HIV-1(NL43-Luc) cells (p < 0.01). However, the MFIs of hROS and NO in MAGIC-5 cells were also increased, to the same level, by electrical stimulation for 5 min. These results suggest that HIV-1 adsorbed onto or invading cells is damaged by direct or indirect effects of electrical stimulation, resulting in a decrease in HIV-1 infectivity. It is also suggested that hROS and NO induced by electrical stimulation are important factors for inhibiting HIV-1 infection.
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Affiliation(s)
- Etsuko Kumagai
- Department of Health Science, Kumamoto University School of Medicine, 4-24-1 Kuhonji, Kumamoto 862-0976, Japan.
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Tominaga M, Nagaishi S, Kirihara M, Kumagai E, Harada S, Taniguchi I. Frequency change-induced alternative potential waveform dependence of membrane damage to cells cultured on an electrode surface. J Biotechnol 2007; 129:498-501. [PMID: 17368608 DOI: 10.1016/j.jbiotec.2007.01.026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2006] [Accepted: 01/24/2007] [Indexed: 10/23/2022]
Abstract
In the present study, alternative potential stimulation with rectangular pulse, sine and triangular waveforms at 10 and 100Hz was applied to cells cultured on an ITO electrode. As a result, we found that the alternating potential waveform dependence induced by the frequency on membrane damage of cells cultured on an electrode surface. The cell membrane damage was promoted by a rectangular pulse wave in comparison with sine and triangular waves, when alternating electrical potentials of 0 to +1.0V at 100Hz were loaded. In contrast, this waveform dependence was not observed when the frequency was 10Hz. Furthermore, it was found that cell membrane damage was induced at positive potentials more than +0.8V under the present experimental conditions.
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Affiliation(s)
- Masato Tominaga
- Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kumamoto 860-8555, Japan.
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15
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バイオセンサ. ELECTROCHEMISTRY 2003. [DOI: 10.5796/electrochemistry.71.592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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16
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Tominaga M, Kumagai E, Harada S. Effect of electrical stimulation on HIV-1-infected HeLa cells cultured on an electrode surface. Appl Microbiol Biotechnol 2003; 61:447-50. [PMID: 12764558 DOI: 10.1007/s00253-003-1225-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2002] [Revised: 12/13/2002] [Accepted: 12/27/2002] [Indexed: 11/28/2022]
Abstract
Acquired immunodeficiency syndrome (AIDS) is a disease caused by infection with the human immunodeficiency virus (HIV). Although drug therapy for AIDS is available, problems such as side effects associated with drug therapy and the appearance of resistant HIV strains have arisen. Therefore, therapies based on new principles other than drug treatment are required. In the present study, the effect of electrical stimulation on HIV-1(LAI) chronically infected HeLa (P6 HeLa/HIV-1(LAI)) cells cultured on an electrode surface was examined. The results indicated that sensitivity to electrical stimulation was much higher in P6 HeLa/HIV-1(LAI) cells than in uninfected P6 HeLa cells. When electrical stimulation was applied at 1.0 V (vs. Ag/AgCl) for 20 min, the proportion of damage to cell membrane among P6 HeLa/HIV-1(LAI) cells, as evaluated by Trypan blue staining, was approximately 4 times higher than that for uninfected P6 HeLa cells. Furthermore, in comparison with uninfected P6 HeLa cells, the proliferation of P6 HeLa/HIV-1(LAI) cells was significantly suppressed after electrical stimulation. This technique was proven to selectively kill P6 HeLa/HIV-1(LAI) cells, when compared with uninfected control cells.
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Affiliation(s)
- M Tominaga
- Kumamoto University College of Medical Science, 4-24-1 Kuhonji, Kumamoto 862-0976, Japan.
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17
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Post-transcriptional regulation of immunomodulatory cytokines production in human skin fibroblasts by intense mechanical stresses. J Biosci Bioeng 2002. [DOI: 10.1016/s1389-1723(02)80020-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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18
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Ohgaki M, Kizuki T, Katsura M, Yamashita K. Manipulation of selective cell adhesion and growth by surface charges of electrically polarized hydroxyapatite. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2001; 57:366-73. [PMID: 11523031 DOI: 10.1002/1097-4636(20011205)57:3<366::aid-jbm1179>3.0.co;2-x] [Citation(s) in RCA: 178] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Adherence of cells to a surface, such as a biomaterial surface, can be significantly influenced by the surface charge on that material. The applicability of electrically charged hydroxyapatite ceramics to selective cell adhesion was examined, and we show that polarized hydroxyapatite has significant effects on cell growth and adhesion. The surface charge applied to polarized hydroxyapatite promotes (i) enhanced colony formation of osteoblast-like cells, (ii) activation of gap junctions, and (iii) specific orienting of neuroblastoma cells. These findings will be of great utility and have significance in applications of tissue engineering, for example, in potential treatments for osteoporosis.
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Affiliation(s)
- M Ohgaki
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda, Tokyo 101-0062, Japan.
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Affiliation(s)
- Masuo AIZAWA
- Department of Biological Information, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology
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20
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AIZAWA M. 生物電気化学. ELECTROCHEMISTRY 2000. [DOI: 10.5796/electrochemistry.68.1018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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