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Rouabhia M, Park HJ, Zhang Z. Electrically Activated Primary Human Fibroblasts Improve In Vitro and In Vivo Skin Regeneration. J Cell Physiol 2016; 231:1814-21. [PMID: 26661681 DOI: 10.1002/jcp.25289] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Accepted: 12/10/2015] [Indexed: 12/14/2022]
Abstract
Electrical stimulation (ES) changes cellular behaviors and thus constitutes a potential strategy to promote wound healing. However, well-controlled in vitro findings have yet to be translated to in vivo trials. This study was to demonstrate the feasibility and advantages of transplanting electrically activated cells (E-Cells) to help wound healing. Primary human skin fibroblasts were activated through well defined ES and cultured with keratinocytes to generate engineered human skin (EHS), which were transplanted to nu/nu mice. The electrically activated EHS grafts were analyzed at 20 and 30 days post-grafting, showing faster wound closure, thick epidermis, vasculature, and functional basement membrane containing laminin and type IV collagen that were totally produced by the implanted human cells. Because a variety of cells can be electrically activated, E-Cells may become a new cell source and the transplantation of E-Cells may represent a new strategy in wound healing and tissue engineering. J. Cell. Physiol. 231: 1814-1821, 2016. © 2015 Wiley Periodicals, Inc.
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Affiliation(s)
- Mahmoud Rouabhia
- Groupe de Recherche en Écologie Buccale, Faculté de Médecine Dentaire, Université Laval, Québec, Canada
| | - Hyun Jin Park
- Groupe de Recherche en Écologie Buccale, Faculté de Médecine Dentaire, Université Laval, Québec, Canada.,Département de Chirurgie, Faculté de Médecine, Axe Médecine Régénératrice, Centre de Recherche du CHU de Québec, Université Laval, Québec, Canada
| | - Ze Zhang
- Département de Chirurgie, Faculté de Médecine, Axe Médecine Régénératrice, Centre de Recherche du CHU de Québec, Université Laval, Québec, Canada
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52
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Du Z, Bondarenko O, Wang D, Rouabhia M, Zhang Z. Ex Vivo Assay of Electrical Stimulation to Rat Sciatic Nerves: Cell Behaviors and Growth Factor Expression. J Cell Physiol 2015; 231:1301-12. [PMID: 26516696 DOI: 10.1002/jcp.25230] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Accepted: 10/28/2015] [Indexed: 01/27/2023]
Abstract
Neurite outgrowth and axon regeneration are known to benefit from electrical stimulation. However, how neuritis and their surroundings react to electrical field is difficult to replicate by monolayer cell culture. In this work freshly harvested rat sciatic nerves were cultured and exposed to two types of electrical field, after which time the nerve tissues were immunohistologically stained and the expression of neurotrophic factors and cytokines were evaluated. ELISA assay was used to confirm the production of specific proteins. All cell populations survived the 48 h culture with little necrosis. Electrical stimulation was found to accelerate Wallerian degeneration and help Schwann cells to switch into migratory phenotype. Inductive electrical stimulation was shown to upregulate the secretion of multiple neurotrophic factors. Cellular distribution in nerve tissue was altered upon the application of an electrical field. This work thus presents an ex vivo model to study denervated axon in well controlled electrical field, bridging monolayer cell culture and animal experiment. It also demonstrated the critical role of electrical field distribution in regulating cellular activities.
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Affiliation(s)
- Zhiyong Du
- Qiandongnan National Polytechnic, Kaili, China.,Département de chirurgie, Faculté de médecine, Centre de recherche du CHU de Québec, Université Laval, Québec (QC), Canada
| | - Olexandr Bondarenko
- Département de chirurgie, Faculté de médecine, Centre de recherche du CHU de Québec, Université Laval, Québec (QC), Canada
| | - Dingkun Wang
- Département de chirurgie, Faculté de médecine, Centre de recherche du CHU de Québec, Université Laval, Québec (QC), Canada
| | - Mahmoud Rouabhia
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec (QC), Canada
| | - Ze Zhang
- Département de chirurgie, Faculté de médecine, Centre de recherche du CHU de Québec, Université Laval, Québec (QC), Canada
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53
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Carbon nanofillers incorporated electrically conducting poly ε-caprolactone nanocomposite films and their biocompatibility studies using MG-63 cell line. Polym Bull (Berl) 2015. [DOI: 10.1007/s00289-015-1533-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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54
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Yang A, Huang Z, Yin G, Pu X. Fabrication of aligned, porous and conductive fibers and their effects on cell adhesion and guidance. Colloids Surf B Biointerfaces 2015; 134:469-74. [PMID: 26258750 DOI: 10.1016/j.colsurfb.2015.07.028] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Revised: 07/09/2015] [Accepted: 07/10/2015] [Indexed: 01/17/2023]
Abstract
The potential applications of aligned, conductive electrospun fibers have been widely studied in anisotropic tissue regeneration. In this study, aligned porous poly L-lactic acid fibers were obtained with electrospinning, then polypyrrole nanoparticles (PPy NPs) were coated onto the porous fibers with oxidation polymerization to prepare electrically conductive fibers with about 1.24 μm of diameter, and their surface conductivity was about 50 mS. The results of L929 cell test showed that more than 55% of cells grew along the aligned porous fiber axis, confirming that the cell guidance of aligned porous fibers was better than that of non-porous fibers. The results of differentiated PC12 cells on porous fibers showed that the alignment degree of neurite outgrowth and average neurite length of the cells were 84% and 111 μm, respectively, which were larger than those on the non-porous fibers. A primary mechanism was proposed to explain effect of these pores on cell/neurite adhesion and orientation along the aligned porous fibers.
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Affiliation(s)
- Anneng Yang
- College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, China
| | - Zhongbing Huang
- College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, China.
| | - Guangfu Yin
- College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, China
| | - Ximing Pu
- College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, China
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Electrical Stimulation Modulates the Expression of Multiple Wound Healing Genes in Primary Human Dermal Fibroblasts. Tissue Eng Part A 2015; 21:1982-90. [DOI: 10.1089/ten.tea.2014.0687] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
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56
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Wu Y, Chen YX, Yan J, Yang S, Dong P, Soman P. Fabrication of conductive polyaniline hydrogel using porogen leaching and projection microstereolithography. J Mater Chem B 2015; 3:5352-5360. [DOI: 10.1039/c5tb00629e] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A PEGda–PANI conductive hydrogel developed using interfacial polymerization process can be applied to range of fabrication methodologies.
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Affiliation(s)
- Yibo Wu
- Department of Biomedical and Chemical Engineering
- Syracuse University
- Syracuse
- USA
| | - Yong X. Chen
- Department of Biomedical and Chemical Engineering
- Syracuse University
- Syracuse
- USA
| | - Jiahan Yan
- Department of Biomedical and Chemical Engineering
- Syracuse University
- Syracuse
- USA
| | - Shihao Yang
- Department of Biomedical and Chemical Engineering
- Syracuse University
- Syracuse
- USA
| | - Ping Dong
- Department of Biomedical and Chemical Engineering
- Syracuse University
- Syracuse
- USA
| | - Pranav Soman
- Department of Biomedical and Chemical Engineering
- Syracuse University
- Syracuse
- USA
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58
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Wu L, Yuan Y, Hao F, Yang Z, Zhang J, Yu M. The Effects of SiC Foams on Cell Proliferation and Differentiation in Primary Osteoblasts. J HARD TISSUE BIOL 2015. [DOI: 10.2485/jhtb.24.37] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Lin Wu
- Department of Prosthodontics, School of Stomatology, China Medical University
| | - Yue Yuan
- Department of Prosthodontics, School of Stomatology, China Medical University
| | - Fengyu Hao
- Department of Prosthodontics, School of Stomatology, China Medical University
| | - Zhenming Yang
- Materials Fabrication and Processing Division, Institute of Metal Research, Chinese Academy of Sciences
| | - Jinsong Zhang
- Materials Fabrication and Processing Division, Institute of Metal Research, Chinese Academy of Sciences
| | - Meng Yu
- Key Laboratory of Transgenetic Animal Research, Liaoning Province, Department of Laboratory Animal of China Medical University, China Medical University
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59
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Gharibi R, Yeganeh H, Gholami H, Hassan ZM. Aniline tetramer embedded polyurethane/siloxane membranes and their corresponding nanosilver composites as intelligent wound dressing materials. RSC Adv 2014. [DOI: 10.1039/c4ra11454j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Balint R, Cassidy NJ, Cartmell SH. Conductive polymers: towards a smart biomaterial for tissue engineering. Acta Biomater 2014; 10:2341-53. [PMID: 24556448 DOI: 10.1016/j.actbio.2014.02.015] [Citation(s) in RCA: 871] [Impact Index Per Article: 87.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Revised: 02/07/2014] [Accepted: 02/10/2014] [Indexed: 01/03/2023]
Abstract
Developing stimulus-responsive biomaterials with easy-to-tailor properties is a highly desired goal of the tissue engineering community. A novel type of electroactive biomaterial, the conductive polymer, promises to become one such material. Conductive polymers are already used in fuel cells, computer displays and microsurgical tools, and are now finding applications in the field of biomaterials. These versatile polymers can be synthesised alone, as hydrogels, combined into composites or electrospun into microfibres. They can be created to be biocompatible and biodegradable. Their physical properties can easily be optimized for a specific application through binding biologically important molecules into the polymer using one of the many available methods for their functionalization. Their conductive nature allows cells or tissue cultured upon them to be stimulated, the polymers' own physical properties to be influenced post-synthesis and the drugs bound in them released, through the application of an electrical signal. It is thus little wonder that these polymers are becoming very important materials for biosensors, neural implants, drug delivery devices and tissue engineering scaffolds. Focusing mainly on polypyrrole, polyaniline and poly(3,4-ethylenedioxythiophene), we review conductive polymers from the perspective of tissue engineering. The basic properties of conductive polymers, their chemical and electrochemical synthesis, the phenomena underlying their conductivity and the ways to tailor their properties (functionalization, composites, etc.) are discussed.
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Luo B, Huang J, Lu L, Hu X, Luo Z, Li M. Electrically induced brain-derived neurotrophic factor release from Schwann cells. J Neurosci Res 2014; 92:893-903. [PMID: 24753179 DOI: 10.1002/jnr.23365] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 12/18/2013] [Accepted: 12/27/2013] [Indexed: 11/10/2022]
Abstract
Regulating the production of brain-derived neurotrophic factor (BDNF) in Schwann cells (SCs) is critical for their application in traumatic nerve injury, neurodegenerative disorders, and demyelination disease in both central and peripheral nervous systems. The present study investigated the possibility of using electrical stimulation (ES) to activate SCs to release BDNF. We found that short-term ES was capable of promoting BDNF production from SCs, and the maximal BDNF release was achieved by ES at 6 V (3 Hz, 30 min). We further examined the involvement of intracellular calcium ions ([Ca2+]i) in the ES-induced BDNF production in SCs by pharmacological studies. We found that the ES-induced BDNF release required calcium influx through T-type voltage-gated calcium channel (VGCC) and calcium mobilization from internal calcium stores, including inositol triphosphate-sensitive stores and caffeine/ryanodine-sensitive stores. In addition, calcium-calmodulin dependent protein kinase IV (CaMK IV), mitogen-activated protein kinase (MAPK), and cAMP response element-binding protein (CREB) were found to play important roles in the ES-induced BDNF release from SCs. In conclusion, ES is capable of activating SCs to secrete BDNF, which requires the involvement of calcium influx through T-type VGCC and calcium mobilization from internal calcium stores. In addition, activation of CaMK IV, MAPK, and CREB were also involved in the ES-induced BDNF release. The findings indicate that ES can improve the neurotrophic ability in SCs and raise the possibility of developing electrically stimulated SCs as a source of cell therapy for nerve injury in both peripheral and central nervous systems.
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Affiliation(s)
- Beier Luo
- Institute of Orthopaedics, Changhai Hospital, The Second Military Medical University, Shanghai, China
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63
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Hu WW, Hsu YT, Cheng YC, Li C, Ruaan RC, Chien CC, Chung CA, Tsao CW. Electrical stimulation to promote osteogenesis using conductive polypyrrole films. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 37:28-36. [PMID: 24582219 DOI: 10.1016/j.msec.2013.12.019] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Revised: 11/08/2013] [Accepted: 12/06/2013] [Indexed: 01/06/2023]
Abstract
In this study, we developed an electrical cell culture and monitoring device. Polypyrrole (PPy) films with different resistances were fabricated as conductive surfaces to investigate the effect of substrate-mediated electrical stimulation. The physical and chemical properties of the devices, as well as their biocompatibilities, were thoroughly evaluated. These PPy films had a dark but transparent appearance, on which the surface cells could be easily observed. After treating with the osteogenic medium, rat bone marrow stromal cells cultured on the PPy films differentiated into osteoblasts. The cells grown on the PPy films had up-regulated osteogenic markers, and an alkaline phosphatase activity assay showed that the PPy films accelerated cell differentiation. Alizarin red staining and calcium analysis suggested that the PPy films promoted osteogenesis. Finally, PPy films were subjected to a constant electric field to elucidate the effect of electrical stimulation on osteogenesis. Compared with the untreated group, electrical stimulation improved calcium deposition in the extracellular matrix. Furthermore, PPy films with lower resistances allowed larger currents to stimulate the surface cells, which resulted in higher levels of mineralization. Overall, these results indicated that this system exhibited superior electroactivity with controllable electrical resistance and that it can be coated directly to produce medical devices with a transparent appearance, which should be beneficial for research on electrical stimulation for tissue regeneration.
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Affiliation(s)
- Wei-Wen Hu
- Department of Chemical and Materials Engineering, National Central University, Jhongli City, Taiwan.
| | - Yi-Ting Hsu
- Department of Chemical and Materials Engineering, National Central University, Jhongli City, Taiwan
| | - Yu-Che Cheng
- Institute of Biomedical Engineering, National Central University, Jhongli, Taiwan; Department of Medical Research, Cathay General Hospital, Taipei, Taiwan
| | - Chuan Li
- Department of Mechanical Engineering, National Central University, Jhongli, Taiwan
| | - Ruoh-Chyu Ruaan
- Department of Chemical and Materials Engineering, National Central University, Jhongli City, Taiwan; Institute of Biomedical Engineering, National Central University, Jhongli, Taiwan
| | - Chih-Cheng Chien
- Department of Medical Research, Cathay General Hospital, Taipei, Taiwan; School of Medicine, Fu Jen Catholic University, Taipei, Taiwan; Department of Anesthesiology, Sijhih Cathay General Hospital, Sijhih City, Taipei, Taiwan
| | - Chih-Ang Chung
- Department of Mechanical Engineering, National Central University, Jhongli, Taiwan
| | - Chia-Wen Tsao
- Department of Mechanical Engineering, National Central University, Jhongli, Taiwan
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64
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65
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Lee JY. Electrically Conducting Polymer-Based Nanofibrous Scaffolds for Tissue Engineering Applications. POLYM REV 2013. [DOI: 10.1080/15583724.2013.806544] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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66
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Pelto J, Björninen M, Pälli A, Talvitie E, Hyttinen J, Mannerström B, Suuronen Seppanen R, Kellomäki M, Miettinen S, Haimi S. Novel polypyrrole-coated polylactide scaffolds enhance adipose stem cell proliferation and early osteogenic differentiation. Tissue Eng Part A 2013; 19:882-92. [PMID: 23126228 DOI: 10.1089/ten.tea.2012.0111] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
An electrically conductive polypyrrole (PPy) doped with a bioactive agent is an emerging functional biomaterial for tissue engineering. We therefore used chondroitin sulfate (CS)-doped PPy coating to modify initially electrically insulating polylactide resulting in novel osteogenic scaffolds. In situ chemical oxidative polymerization was used to obtain electrically conductive PPy coating on poly-96L/4D-lactide (PLA) nonwoven scaffolds. The coated scaffolds were characterized and their electrical conductivity was evaluated in hydrolysis. The ability of the coated and conductive scaffolds to enhance proliferation and osteogenic differentiation of human adipose stem cells (hASCs) under electrical stimulation (ES) in three-dimensional (3D) geometry was compared to the noncoated PLA scaffolds. Electrical conductivity of PPy-coated PLA scaffolds (PLA-PPy) was evident at the beginning of hydrolysis, but decreased during the first week of incubation due to de-doping. PLA-PPy scaffolds enhanced hASC proliferation significantly compared to the plain PLA scaffolds at 7 and 14 days. Furthermore, the alkaline phosphatase (ALP) activity of the hASCs was generally higher in PLA-PPy seeded scaffolds, but due to patient variation, no statistical significance could be determined. ES did not have a significant effect on hASCs. This study highlights the potential of novel PPy-coated PLA scaffolds in bone tissue engineering.
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Affiliation(s)
- Jani Pelto
- VTT Technical Research Centre of Finland, Tampere, Finland
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67
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Kai D, Prabhakaran MP, Jin G, Ramakrishna S. Biocompatibility evaluation of electrically conductive nanofibrous scaffolds for cardiac tissue engineering. J Mater Chem B 2013; 1:2305-2314. [DOI: 10.1039/c3tb00151b] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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68
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Medical Fibers and Biotextiles. Biomater Sci 2013. [DOI: 10.1016/b978-0-08-087780-8.00029-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
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69
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Wang Y, Rouabhia M, Zhang Z. PPy-coated PET fabrics and electric pulse-stimulated fibroblasts. J Mater Chem B 2013; 1:3789-3796. [DOI: 10.1039/c3tb20257g] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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70
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Meng S, Rouabhia M, Zhang Z. Electrical stimulation modulates osteoblast proliferation and bone protein production through heparin-bioactivated conductive scaffolds. Bioelectromagnetics 2012; 34:189-99. [PMID: 23124591 DOI: 10.1002/bem.21766] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Accepted: 10/04/2012] [Indexed: 01/29/2023]
Abstract
Electrical fields are known to interact with human cells. This principle has been explored to regulate cellular activities for bone tissue regeneration. In this work, Saos-2 cells were cultured on conductive scaffolds made of biodegradable poly(L-lactide) and the heparin-containing, electrically conducting polypyrrole (PPy/HE) to study their reaction to electrical stimulation (ES) mediated through such scaffolds. Both the duration and intensity of ES enhanced cell proliferation, generating a unique electrical intensity and temporal "window" within which osteoblast proliferation was upmodulated in contrast to the downmodulation or ineffectiveness in other ES regions. The favourable ES intensity (200 mV/mm) was further investigated in terms of the gene activation and protein production of two important osteoblast markers characterised by extracellular matrix maturation and mineralisation, that is alkaline phosphatase (ALP) and osteocalcin (OC). Both genes were found activated and the relevant protein production increased significantly following ES. In contrast, ES in the down-modulation region (400 mV/mm) suppressed the production of both ALP and OC. This work demonstrated that important osteoblast markers can be modulated with specific ES parameters mediated through conductive polymer substrates, providing a unique strategy for bone tissue engineering.
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Affiliation(s)
- Shiyun Meng
- College of Environment and Biotechnology, Chongqing Technology and Business University, Chongqing, China
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71
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Balint R, Cassidy NJ, Cartmell SH. Electrical stimulation: a novel tool for tissue engineering. TISSUE ENGINEERING PART B-REVIEWS 2012; 19:48-57. [PMID: 22873689 DOI: 10.1089/ten.teb.2012.0183] [Citation(s) in RCA: 221] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
New advances in tissue engineering are being made through the application of different types of electrical stimuli to influence cell proliferation and differentiation. Developments made in the last decade have allowed us to improve the structure and functionality of tissue-engineered products through the use of growth factors, hormones, drugs, physical stimuli, bioreactor use, and two-dimensional (2-D) and three-dimensional (3-D) artificial extracellular matrices (with various material properties and topography). Another potential type of stimulus is electricity, which is important in the physiology and development of the majority of all human tissues. Despite its great potential, its role in tissue regeneration and its ability to influence cell migration, orientation, proliferation, and differentiation has rarely been considered in tissue engineering. This review highlights the importance of endogenous electrical stimulation, gathering the current knowledge on its natural occurrence and role in vivo, discussing the novel methods of delivering this stimulus and examining its cellular and tissue level effects, while evaluating how the technique could benefit the tissue engineering discipline in the future.
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Affiliation(s)
- Richard Balint
- Materials Science Centre, University of Manchester, Manchester, United Kingdom
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72
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Zhao C, Tan A, Pastorin G, Ho HK. Nanomaterial scaffolds for stem cell proliferation and differentiation in tissue engineering. Biotechnol Adv 2012; 31:654-68. [PMID: 22902273 DOI: 10.1016/j.biotechadv.2012.08.001] [Citation(s) in RCA: 146] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Revised: 07/31/2012] [Accepted: 08/01/2012] [Indexed: 02/08/2023]
Abstract
Tissue engineering is a clinically driven field and has emerged as a potential alternative to organ transplantation. The cornerstone of successful tissue engineering rests upon two essential elements: cells and scaffolds. Recently, it was found that stem cells have unique capabilities of self-renewal and multilineage differentiation to serve as a versatile cell source, while nanomaterials have lately emerged as promising candidates in producing scaffolds able to better mimic the nanostructure in natural extracellular matrix and to efficiently replace defective tissues. This article, therefore, reviews the key developments in tissue engineering, where the combination of stem cells and nanomaterial scaffolds has been utilized over the past several years. We consider the high potential, as well as the main issues related to the application of stem cells and nanomaterial scaffolds for a range of tissues including bone, cartilage, nerve, liver, eye etc. Promising in vitro results such as efficient attachment, proliferation and differentiation of stem cells have been compiled in a series of examples involving different nanomaterials. Furthermore, the merits of the marriage of stem cells and nanomaterial scaffolds are also demonstrated in vivo, providing early successes to support subsequent clinical investigations. This progress simultaneously drives mechanistic research into the mechanotransduction process responsible for the observations in order to optimize the process further. Current understanding is chiefly reported to involve the interaction of stem cells and the anchoring nanomaterial scaffolds by activating various signaling pathways. Substrate surface characteristics and scaffold bulk properties are also reported to influence not only short term stem cell adhesion, spreading and proliferation, but also longer term lineage differentiation, functionalization and viability. It is expected that the combination of stem cells and nanomaterials will develop into an important tool in tissue engineering for the innovative treatment of many diseases.
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Affiliation(s)
- Chunyan Zhao
- NanoCore, Engineering Block A, EA, Faculty of Engineering, National University of Singapore, 117576, Singapore
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73
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Wallace GG, Higgins MJ, Moulton SE, Wang C. Nanobionics: the impact of nanotechnology on implantable medical bionic devices. NANOSCALE 2012; 4:4327-4347. [PMID: 22695635 DOI: 10.1039/c2nr30758h] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The nexus of any bionic device can be found at the electrode-cellular interface. Overall efficiency is determined by our ability to transfer electronic information across that interface. The nanostructure imparted to electrodes plays a critical role in controlling the cascade of events that determines the composition and structure of that interface. With commonly used conductors: metals, carbon and organic conducting polymers, a number of approaches that promote control over structure in the nanodomain have emerged in recent years with subsequent studies revealing a critical dependency between nanostructure and cellular behaviour. As we continue to develop our understanding of how to create and characterise electromaterials in the nanodomain, this is expected to have a profound effect on the development of next generation bionic devices. In this review, we focus on advances in fabricating nanostructured electrodes that present new opportunities in the field of medical bionics. We also briefly evaluate the interactions of living cells with the nanostructured electromaterials, in addition to highlighting emerging tools used for nanofabrication and nanocharacterisation of the electrode-cellular interface.
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Affiliation(s)
- G G Wallace
- ARC Centre of Excellence for Electromaterials Science (ACES), Intelligent Polymer Research Institute, AIIM Facility, Innovation Campus, University of Wollongong, NSW 2522, Australia
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74
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ZHAO PC, LV YG, ZOU Y, ZHANG XM, CHEN GB, YANG L. Research Advancement on Injured Peripheral Nerve Regeneration by Stem Cells Combined With Electrical Stimulation*. PROG BIOCHEM BIOPHYS 2012. [DOI: 10.3724/sp.j.1206.2011.00467] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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75
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Zhang L, Meng S, Zhang Z. Electroactivity and Stability of Polylactide/Polypyrrole Composites. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 22:1931-46. [DOI: 10.1163/092050610x529164] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Linli Zhang
- a Département de Chirurgie, Faculté de Médecine, Université Laval, Centre de Recherche Hôpital Saint-François d'Assise, CHUQ, 10 rue de l'Espinay, local E0-165, Québec, QC, Canada G1L 3L5
| | - Shiyun Meng
- b Département de Chirurgie, Faculté de Médecine, Université Laval, Centre de Recherche Hôpital Saint-François d'Assise, CHUQ, 10 rue de l'Espinay, local E0-165, Québec, QC, Canada G1L 3L5
| | - Ze Zhang
- c Département de Chirurgie, Faculté de Médecine, Université Laval, Centre de Recherche Hôpital Saint-François d'Assise, CHUQ, 10 rue de l'Espinay, local E0-165, Québec, QC, Canada G1L 3L5.
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Jin L, Wang T, Feng ZQ, Zhu M, Leach MK, Naim YI, Jiang Q. Fabrication and characterization of a novel fluffy polypyrrole fibrous scaffold designed for 3D cell culture. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm32165c] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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77
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Guo B, Finne-Wistrand A, Albertsson AC. Electroactive Hydrophilic Polylactide Surface by Covalent Modification with Tetraaniline. Macromolecules 2011. [DOI: 10.1021/ma202508h] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Baolin Guo
- Department
of Fibre and Polymer Technology, School
of Chemical Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
| | - Anna Finne-Wistrand
- Department
of Fibre and Polymer Technology, School
of Chemical Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
| | - Ann-Christine Albertsson
- Department
of Fibre and Polymer Technology, School
of Chemical Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
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78
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Wilkinson AE, McCormick AM, Leipzig ND. Central Nervous System Tissue Engineering: Current Considerations and Strategies. ACTA ACUST UNITED AC 2011. [DOI: 10.2200/s00390ed1v01y201111tis008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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79
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Sirivisoot S, Pareta RA, Webster TJ. A conductive nanostructured polymer electrodeposited on titanium as a controllable, local drug delivery platform. J Biomed Mater Res A 2011; 99:586-97. [DOI: 10.1002/jbm.a.33210] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2011] [Revised: 05/12/2011] [Accepted: 06/09/2011] [Indexed: 01/17/2023]
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80
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Kai D, Prabhakaran MP, Jin G, Ramakrishna S. Polypyrrole-contained electrospun conductive nanofibrous membranes for cardiac tissue engineering. J Biomed Mater Res A 2011; 99:376-85. [DOI: 10.1002/jbm.a.33200] [Citation(s) in RCA: 182] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2011] [Revised: 06/20/2011] [Accepted: 06/23/2011] [Indexed: 01/13/2023]
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81
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Grausova L, Kromka A, Burdikova Z, Eckhardt A, Rezek B, Vacik J, Haenen K, Lisa V, Bacakova L. Enhanced growth and osteogenic differentiation of human osteoblast-like cells on boron-doped nanocrystalline diamond thin films. PLoS One 2011; 6:e20943. [PMID: 21695172 PMCID: PMC3112228 DOI: 10.1371/journal.pone.0020943] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2010] [Accepted: 05/16/2011] [Indexed: 11/17/2022] Open
Abstract
Intrinsic nanocrystalline diamond (NCD) films have been proven to be promising substrates for the adhesion, growth and osteogenic differentiation of bone-derived cells. To understand the role of various degrees of doping (semiconducting to metallic-like), the NCD films were deposited on silicon substrates by a microwave plasma-enhanced CVD process and their boron doping was achieved by adding trimethylboron to the CH4:H2 gas mixture, the B∶C ratio was 133, 1000 and 6700 ppm. The room temperature electrical resistivity of the films decreased from >10 MΩ (undoped films) to 55 kΩ, 0.6 kΩ, and 0.3 kΩ (doped films with 133, 1000 and 6700 ppm of B, respectively). The increase in the number of human osteoblast-like MG 63 cells in 7-day-old cultures on NCD films was most apparent on the NCD films doped with 133 and 1000 ppm of B (153,000±14,000 and 152,000±10,000 cells/cm2, respectively, compared to 113,000±10,000 cells/cm2 on undoped NCD films). As measured by ELISA per mg of total protein, the cells on NCD with 133 and 1000 ppm of B also contained the highest concentrations of collagen I and alkaline phosphatase, respectively. On the NCD films with 6700 ppm of B, the cells contained the highest concentration of focal adhesion protein vinculin, and the highest amount of collagen I was adsorbed. The concentration of osteocalcin also increased with increasing level of B doping. The cell viability on all tested NCD films was almost 100%. Measurements of the concentration of ICAM-1, i.e. an immunoglobuline adhesion molecule binding inflammatory cells, suggested that the cells on the NCD films did not undergo significant immune activation. Thus, the potential of NCD films for bone tissue regeneration can be further enhanced and tailored by B doping and that B doping up to metallic-like levels is not detrimental for cells.
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Affiliation(s)
- Lubica Grausova
- Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
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82
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Liu Y, Hu J, Zhuang X, Zhang P, Chen X, Wei Y, Wang X. Preparation and Characterization of Biodegradable and Electroactive Polymer Blend Materials Based on mPEG/Tetraaniline and PLLA. Macromol Biosci 2011; 11:806-13. [DOI: 10.1002/mabi.201000465] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Revised: 01/24/2011] [Indexed: 11/11/2022]
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83
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Material properties and electrical stimulation regimens of polycaprolactone fumarate-polypyrrole scaffolds as potential conductive nerve conduits. Acta Biomater 2011; 7:944-53. [PMID: 20965280 DOI: 10.1016/j.actbio.2010.10.013] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2010] [Revised: 10/01/2010] [Accepted: 10/12/2010] [Indexed: 11/21/2022]
Abstract
The mechanical and electrical properties of polycaprolactone fumarate-polypyrrole (PCLF-PPy) scaffolds were studied under physiological conditions to evaluate their ability to maintain the material properties necessary for application as conductive nerve conduits. PC12 cells cultured on PCLF-PPy scaffolds were stimulated with regimens of 10 μA of either a constant or a 20 Hz frequency current passed through the scaffolds for 1h per day. PC12 cellular morphologies were analyzed by fluorescence microscopy after 48 h. PCLF-PPy scaffolds exhibited excellent mechanical properties at 37 °C which would allow suturing and flexibility. The surface resistivity of the scaffolds was 2 kΩ and the scaffolds were electrically stable during the application of electrical stimulation (ES). In vitro studies showed significant increases in the percentage of neurite bearing cells, number of neurites per cell and neurite length in the presence of ES compared with no ES. Additionally, extending neurites were observed to align in the direction of the applied current. This study shows that electrically conductive PCLF-PPy scaffolds possess the material properties necessary for application as nerve conduits. Additionally, the capability to significantly enhance and direct neurite extension by passing an electrical current through PCLF-PPy scaffolds renders them even more promising as future therapeutic treatments for severe nerve injuries.
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84
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Sirivisoot S, Pareta R, Webster TJ. Electrically controlled drug release from nanostructured polypyrrole coated on titanium. NANOTECHNOLOGY 2011; 22:085101. [PMID: 21242621 DOI: 10.1088/0957-4484/22/8/085101] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Previous studies have demonstrated that multi-walled carbon nanotubes grown out of anodized nanotubular titanium (MWNT-Ti) can be used as a sensing electrode for various biomedical applications; such sensors detected the redox reactions of certain molecules, specifically proteins deposited by osteoblasts during extracellular matrix bone formation. Since it is known that polypyrrole (PPy) can release drugs upon electrical stimulation, in this study antibiotics (penicillin/streptomycin, P/S) or an anti-inflammatory drug (dexamethasone, Dex), termed PPy[P/S] or PPy[Dex], respectively, were electrodeposited in PPy on titanium. The objective of the present study was to determine if such drugs can be released from PPy on demand and (by applying a voltage) control cellular behavior important for orthopedic applications. Results showed that PPy films possessed nanometer-scale roughness as analyzed by atomic force microscopy. X-ray photoelectron spectroscopy confirmed the presence of P/S and Dex encapsulated within the PPy films. Results from cyclic voltammetry showed that 80% of the drugs were released on demand when sweep voltages were applied for five cycles at a scan rate of 0.1 V s(-1). Furthermore, osteoblast (bone-forming cells) and fibroblast (fibrous tissue-forming cells) adhesion were determined on the PPy films. Results showed that PPy[Dex] enhanced osteoblast adhesion after 4 h of culture compared to plain Ti. PPy-Ti (with or without anionic drug doping) inhibited fibroblast adhesion compared to plain Ti. These in vitro results confirmed that electrodeposited PPy[P/S] and PPy[Dex] can release drugs on demand to potentially fight bacterial infection, reduce inflammation, promote bone growth or reduce fibroblast functions, further implicating the use of such materials as implant sensors.
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85
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Shao S, Zhou S, Li L, Li J, Luo C, Wang J, Li X, Weng J. Osteoblast function on electrically conductive electrospun PLA/MWCNTs nanofibers. Biomaterials 2011; 32:2821-33. [PMID: 21292320 DOI: 10.1016/j.biomaterials.2011.01.051] [Citation(s) in RCA: 180] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2010] [Accepted: 01/04/2011] [Indexed: 11/30/2022]
Abstract
The electrospinning process was utilized successfully to fabricate the random oriented and aligned electrically conductive nanofibers of biodegradable poly-DL-lactide (PLA) in which multiwalled carbon nanotubes (MWCNTs) were embedded. The topographical features of the composite nanofibers were characterized by SEM. The dispersion and alignment of MWCNTs in nanofiber matrix were observed by TEM. The in vitro degradation was characterized in terms of the morphological change, the mass loss and the reduction of polymer molecular weight as well as the decrease of pH value of degradation media. In particular, these conductive nanofiber meshes offered a unique system to study the synergistic effect of topographic cues and electrical stimulation on osteoblasts outgrowth as a way of exploring their potential application in bone tissue engineering. The results of obsteoblasts assay unstimulated showed that the aligned nanofibers as topographic cues could enhance the extension and direct the outgrowth of obsteoblasts better than random fibers. In the presence of direct current (DC) of 100 μA, the obsteoblasts on all samples grew along the electrical current direction. The cellular elongation and proliferation were mainly dependent on the electrical stimulation whereas the topographical features played a minor role in them. Therefore, electrical stimulation with an appropriate DC value imparted on conductive substrate had great potential in application of bone tissue engineering.
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Affiliation(s)
- Shijun Shao
- School of Life Science and Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, PR China
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86
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Ghasemi-Mobarakeh L, Prabhakaran MP, Morshed M, Nasr-Esfahani MH, Baharvand H, Kiani S, Al-Deyab SS, Ramakrishna S. Application of conductive polymers, scaffolds and electrical stimulation for nerve tissue engineering. J Tissue Eng Regen Med 2011; 5:e17-35. [PMID: 21413155 DOI: 10.1002/term.383] [Citation(s) in RCA: 361] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2010] [Accepted: 10/12/2010] [Indexed: 12/17/2022]
Abstract
Among the numerous attempts to integrate tissue engineering concepts into strategies to repair nearly all parts of the body, neuronal repair stands out. This is partially due to the complexity of the nervous anatomical system, its functioning and the inefficiency of conventional repair approaches, which are based on single components of either biomaterials or cells alone. Electrical stimulation has been shown to enhance the nerve regeneration process and this consequently makes the use of electrically conductive polymers very attractive for the construction of scaffolds for nerve tissue engineering. In this review, by taking into consideration the electrical properties of nerve cells and the effect of electrical stimulation on nerve cells, we discuss the most commonly utilized conductive polymers, polypyrrole (PPy) and polyaniline (PANI), along with their design and modifications, thus making them suitable scaffolds for nerve tissue engineering. Other electrospun, composite, conductive scaffolds, such as PANI/gelatin and PPy/poly(ε-caprolactone), with or without electrical stimulation, are also discussed. Different procedures of electrical stimulation which have been used in tissue engineering, with examples on their specific applications in tissue engineering, are also discussed.
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87
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Zhang L, Stauffer WR, Jane EP, Sammak PJ, Cui XT. Enhanced Differentiation of Embryonic and Neural Stem Cells to Neuronal Fates on Laminin Peptides Doped Polypyrrole. Macromol Biosci 2010; 10:1456-64. [DOI: 10.1002/mabi.201000176] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2010] [Revised: 07/02/2010] [Indexed: 11/08/2022]
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88
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89
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Breukers RD, Gilmore KJ, Kita M, Wagner KK, Higgins MJ, Moulton SE, Clark GM, Officer DL, Kapsa RMI, Wallace GG. Creating conductive structures for cell growth: Growth and alignment of myogenic cell types on polythiophenes. J Biomed Mater Res A 2010; 95:256-68. [DOI: 10.1002/jbm.a.32822] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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90
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Runge MB, Dadsetan M, Baltrusaitis J, Knight AM, Ruesink T, Lazcano EA, Lu L, Windebank AJ, Yaszemski MJ. The development of electrically conductive polycaprolactone fumarate-polypyrrole composite materials for nerve regeneration. Biomaterials 2010; 31:5916-26. [PMID: 20483452 DOI: 10.1016/j.biomaterials.2010.04.012] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Accepted: 04/05/2010] [Indexed: 01/19/2023]
Abstract
Electrically conductive polymer composites composed of polycaprolactone fumarate and polypyrrole (PCLF-PPy) have been developed for nerve regeneration applications. Here we report the synthesis and characterization of PCLF-PPy and in vitro studies showing PCLF-PPy materials support both PC12 cell and dorsal root ganglia (DRG) neurite extension. PCLF-PPy composite materials were synthesized by polymerizing pyrrole in preformed PCLF scaffolds (M(n) 7,000 or 18,000 g mol(-1)) resulting in interpenetrating networks of PCLF-PPy. Chemical compositions and thermal properties were characterized by ATR-FTIR, XPS, DSC, and TGA. PCLF-PPy materials were synthesized with five different anions (naphthalene-2-sulfonic acid sodium salt (NSA), dodecylbenzenesulfonic acid sodium salt (DBSA), dioctyl sulfosuccinate sodium salt (DOSS), potassium iodide (I), and lysine) to investigate effects on electrical conductivity and to optimize chemical composition for cellular compatibility. PCLF-PPy materials have variable electrical conductivity up to 6 mS cm(-1) with bulk compositions ranging from 5 to 13.5 percent polypyrrole. AFM and SEM characterization show microstructures with a root mean squared (RMS) roughness of 1195 nm and nanostructures with RMS roughness of 8 nm. In vitro studies using PC12 cells and DRG show PCLF-PPy materials synthesized with NSA or DBSA support cell attachment, proliferation, neurite extension, and are promising materials for future studies involving electrical stimulation.
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Affiliation(s)
- M Brett Runge
- Department of Orthopedic Surgery, Mayo Clinic College of Medicine, Rochester MN 55905, USA
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91
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Huang J, Hu X, Lu L, Ye Z, Zhang Q, Luo Z. Electrical regulation of Schwann cells using conductive polypyrrole/chitosan polymers. J Biomed Mater Res A 2010; 93:164-74. [PMID: 19536828 DOI: 10.1002/jbm.a.32511] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Electrical stimulation (ES) can dramatically enhance neurite outgrowth through conductive polymers and accelerate peripheral nerve regeneration in animal models of nerve injury. Therefore, conductive tissue engineering graft in combination with ES is a potential treatment for neural injuries. Conductive tissue engineering graft can be obtained by seeding Schwann cells on conductive scaffold. However, when ES is applied through the conductive scaffold, the impact of ES on Schwann cells has never been investigated. In this study, a biodegradable conductive composite made of conductive polypyrrole (PPy, 2.5%) and biodegradable chitosan (97.5%) was prepared in order to electrically stimulate Schwann cells. The tolerance of Schwann cells to ES was examined by a cell apoptosis assay. The growth of the cells was characterized using DAPI staining and a MTT assay. mRNA and protein levels of nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF) in Schwann cells were assayed by RT-PCR and Western blotting, and the amount of NGF and BDNF secreted was determined by an ELISA assay. The results showed that the PPy/chitosan membranes supported cell adhesion, spreading, and proliferation with or without ES. Interestingly, ES applied through the PPy/chitosan composite dramatically enhanced the expression and secretion of NGF and BDNF when compared with control cells without ES. These findings highlight for the first time the possibility of enhancing nerve regeneration in conductive scaffolds through ES-increased neurotrophin secretion.
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Affiliation(s)
- Jinghui Huang
- Institute of Orthopaedics, Xijing Hospital, The Fourth Military Medical University, Xi'an 710032, China
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92
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Huang J, Ye Z, Hu X, Lu L, Luo Z. Electrical stimulation induces calcium-dependent release of NGF from cultured Schwann cells. Glia 2010; 58:622-31. [PMID: 19998481 DOI: 10.1002/glia.20951] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Production of nerve growth factor (NGF) from Schwann cells (SCs) progressively declines in the distal stump, if axonal regeneration is staggered across the suture site after peripheral nerve injuries. This may be an important factor limiting the outcome of nerve injury repair. Thus far, extensive efforts are devoted to modulating NGF production in cultured SCs, but little has been achieved. In the present in vitro study, electrical stimulation (ES) was attempted to stimulate cultured SCs to release NGF. Our data showed that ES was capable of enhancing NGF release from cultured SCs. An electrical field (1 Hz, 5 V/cm) caused a 4.1-fold increase in NGF release from cultured SCs. The ES-induced NGF release is calcium dependent. Depletion of extracellular or/and intracellular calcium partially/ completely abolished the ES-induced NGF release. Further pharmacological interventions showed that ES induces calcium influx through T-type voltage-gated calcium channels and mobilizes calcium from 1, 4, 5-trisphosphate-sensitive stores and caffeine/ryanodine-sensitive stores, both of which contributed to the enhanced NGF release induced by ES. In addition, a calcium-triggered exocytosis mechanism was involved in the ES-induced NGF release from cultured SCs. These findings show the feasibility of using ES in stimulating SCs to release NGF, which holds great potential in promoting nerve regeneration by enhancing survival and outgrowth of damaged nerves, and is of great significance in nerve injury repair and neuronal tissue engineering.
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Affiliation(s)
- Jinghui Huang
- Department of Spine Surgery, Institute of Orthopaedics, Xijing Hospital, The Fourth Military Medical University, Xi'an, China
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93
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Guo B, Finne-Wistrand A, Albertsson AC. Molecular Architecture of Electroactive and Biodegradable Copolymers Composed of Polylactide and Carboxyl-Capped Aniline Trimer. Biomacromolecules 2010; 11:855-63. [DOI: 10.1021/bm9011248] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Baolin Guo
- Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44, Stockholm, Sweden
| | - Anna Finne-Wistrand
- Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44, Stockholm, Sweden
| | - Ann-Christine Albertsson
- Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, Royal Institute of Technology, SE-100 44, Stockholm, Sweden
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94
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Skeletal muscle cell proliferation and differentiation on polypyrrole substrates doped with extracellular matrix components. Biomaterials 2009; 30:5292-304. [DOI: 10.1016/j.biomaterials.2009.06.059] [Citation(s) in RCA: 183] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2009] [Accepted: 06/29/2009] [Indexed: 12/30/2022]
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