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Liu S, Xie YY, Wang B. Role and prospects of regenerative biomaterials in the repair of spinal cord injury. Neural Regen Res 2019; 14:1352-1363. [PMID: 30964053 PMCID: PMC6524500 DOI: 10.4103/1673-5374.253512] [Citation(s) in RCA: 77] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 12/20/2018] [Indexed: 12/12/2022] Open
Abstract
Axonal junction defects and an inhibitory environment after spinal cord injury seriously hinder the regeneration of damaged tissues and neuronal functions. At the site of spinal cord injury, regenerative biomaterials can fill cavities, deliver curative drugs, and provide adsorption sites for transplanted or host cells. Some regenerative biomaterials can also inhibit apoptosis, inflammation and glial scar formation, or further promote neurogenesis, axonal growth and angiogenesis. This review summarized a variety of biomaterial scaffolds made of natural, synthetic, and combined materials applied to spinal cord injury repair. Although these biomaterial scaffolds have shown a certain therapeutic effect in spinal cord injury repair, there are still many problems to be resolved, such as product standards and material safety and effectiveness.
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Affiliation(s)
- Shuo Liu
- Clinical Stem Cell Center, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, Jiangsu Province, China
| | - Yuan-Yuan Xie
- Clinical Stem Cell Center, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, Jiangsu Province, China
| | - Bin Wang
- Clinical Stem Cell Center, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, Jiangsu Province, China
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Li Y, Liao C, Tjong SC. Electrospun Polyvinylidene Fluoride-Based Fibrous Scaffolds with Piezoelectric Characteristics for Bone and Neural Tissue Engineering. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E952. [PMID: 31261995 PMCID: PMC6669491 DOI: 10.3390/nano9070952] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 06/14/2019] [Accepted: 06/15/2019] [Indexed: 02/07/2023]
Abstract
Polyvinylidene fluoride (PVDF) and polyvinylidene fluoride-trifluoroethylene (P(VDF-TrFE) with excellent piezoelectricity and good biocompatibility are attractive materials for making functional scaffolds for bone and neural tissue engineering applications. Electrospun PVDF and P(VDF-TrFE) scaffolds can produce electrical charges during mechanical deformation, which can provide necessary stimulation for repairing bone defects and damaged nerve cells. As such, these fibrous mats promote the adhesion, proliferation and differentiation of bone and neural cells on their surfaces. Furthermore, aligned PVDF and P(VDF-TrFE) fibrous mats can enhance neurite growth along the fiber orientation direction. These beneficial effects derive from the formation of electroactive, polar β-phase having piezoelectric properties. Polar β-phase can be induced in the PVDF fibers as a result of the polymer jet stretching and electrical poling during electrospinning. Moreover, the incorporation of TrFE monomer into PVDF can stabilize the β-phase without mechanical stretching or electrical poling. The main drawbacks of electrospinning process for making piezoelectric PVDF-based scaffolds are their small pore sizes and the use of highly toxic organic solvents. The small pore sizes prevent the infiltration of bone and neuronal cells into the scaffolds, leading to the formation of a single cell layer on the scaffold surfaces. Accordingly, modified electrospinning methods such as melt-electrospinning and near-field electrospinning have been explored by the researchers to tackle this issue. This article reviews recent development strategies, achievements and major challenges of electrospun PVDF and P(VDF-TrFE) scaffolds for tissue engineering applications.
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Affiliation(s)
- Yuchao Li
- Department of Materials Science and Engineering, Liaocheng University, Liaocheng 252000, China.
| | - Chengzhu Liao
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Sie Chin Tjong
- Department of Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.
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Srikanth M, Asmatulu R, Cluff K, Yao L. Material Characterization and Bioanalysis of Hybrid Scaffolds of Carbon Nanomaterial and Polymer Nanofibers. ACS OMEGA 2019; 4:5044-5051. [PMID: 30949614 PMCID: PMC6441941 DOI: 10.1021/acsomega.9b00197] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 02/25/2019] [Indexed: 06/09/2023]
Abstract
The interconnected porous structures that mimic the extracellular matrix support cell growth in tissue engineering. Nanofibers generated by electrospinning can act as a vehicle for therapeutic cell delivery to a neural lesion. The incorporation of carbon nanomaterials with excellent electrical conductivity in nanofibers is an attractive aspect for design of a nanodevice for neural tissue regeneration. In this study, nanoscaffolds were created by electrospinning poly(ε-caprolactone) (PCL) and three different types of carbon nanomaterials, which are carbon nanotubes, graphene, and fullerene. The component of carbon nanomaterials in nanofibers was confirmed by Fourier transform infrared spectroscopy. The fiber diameter was determined by scanning electron microscopy, and it was found that the diameter varied depending on the type of nanomaterial in the fibers. The incorporation of carbon nanotubes and graphene in the PCL fibers increased the contact angle significantly, while the incorporation of fullerene reduced the contact angle significantly. Incorporation of CNT, fullerene, and graphene in the PCL fibers increased dielectric constant. Astrocytes isolated from neonatal rats were cultured on PCL-nanomaterial nanofibers. The cell viability assay showed that the PCL-nanomaterial nanofibers were not toxic to the cultured astrocytes. The immunolabeling showed the growth and morphology of astrocytes on nanofiber scaffolds. SEM was performed to determine the cell attachment and interaction with the nanoscaffolds. This study indicates that PCL nanofibers containing nanomaterials are biocompatible and could be used for cell and drug delivery into the nervous system.
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Affiliation(s)
- Madhulika Srikanth
- Department
of Mechanical Engineering, Wichita State
University, 1845 Fairmount Street, Wichita, Kansas 67260-0133, United States
| | - Ramazan Asmatulu
- Department
of Mechanical Engineering, Wichita State
University, 1845 Fairmount Street, Wichita, Kansas 67260-0133, United States
| | - Kim Cluff
- Department
of Biomedical Engineering, Wichita State
University, 1845 Fairmount Street, Wichita, Kansas 67260-0066, United States
| | - Li Yao
- Department
of Biological Sciences, Wichita State University, 1845 Fairmount Street, Wichita, Kansas 67260-0026, United States
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Luo B, Tian L, Chen N, Ramakrishna S, Thakor N, Yang IH. Electrospun nanofibers facilitate better alignment, differentiation, and long-term culture in an in vitro model of the neuromuscular junction (NMJ). Biomater Sci 2019; 6:3262-3272. [PMID: 30402630 DOI: 10.1039/c8bm00720a] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The neuromuscular junction (NMJ) is a specialized synapse between motor neurons and the muscle fibers they innervate. Due to the complexity of various signalling molecules and pathways, in vivo NMJs are difficult to study. Therefore, in vitro motor neuron-muscle co-culture plays a pivotal role in studying the mechanisms of NMJ formation associated with neurodegenerative diseases. There is a growing need to develop novel methodologies that can be used to develop long-term cultures of NMJs. To date, there have been few studies on NMJ development and long-term maintenance of the system, which is also the main challenge for the current in vitro models of NMJs. In this study, we demonstrate a long-term co-culture system of primary embryonic motor neurons from Sprague-Dawley rats and C2C12 cells on both random and aligned electrospun polylactic acid (PLA) nanofibrous scaffolds. This is the first study to explore the role of electrospun nanofibers in the long-term maintenance of NMJs. PLA nanofibrous scaffolds provide better contact guidance for C2C12 cells aligning along the fibers, thus guiding myotube formation. We can only maintain the co-culture system on a conventional glass substrate for 2 weeks, whilst 55% and 70% of the cells still survived on random and aligned PLA substrates after 7 weeks. Our nanofiber-based long-term co-culture system is used as an important tool for the fundamental research of NMJs.
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Affiliation(s)
- Baiwen Luo
- Singapore Institute for Neurotechnology, National University of Singapore, 28 Medical Drive, #05-COR, Singapore 119077. inhong.yang.@ku.ac.ae
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D’Amato AR, Puhl DL, Ziemba AM, Johnson CDL, Doedee J, Bao J, Gilbert RJ. Exploring the effects of electrospun fiber surface nanotopography on neurite outgrowth and branching in neuron cultures. PLoS One 2019; 14:e0211731. [PMID: 30716106 PMCID: PMC6361509 DOI: 10.1371/journal.pone.0211731] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 01/18/2019] [Indexed: 12/19/2022] Open
Abstract
Three aligned, electrospun fiber scaffolds with unique surface features were created from poly-L-lactic acid (PLLA). Fibers without surface nanotopography (smooth fibers), fibers with surface divots (shallow pits), and fibers with surface pits (deeper pits) were fabricated, and fiber alignment, diameter, and density were characterized using scanning electron microscopy (SEM). Whole dorsal root ganglia (DRG) were isolated from rats and placed onto uncoated fibers or fibers coated with laminin. On uncoated fibers, neurite outgrowth was restricted by fibers displaying divoted or pitted nanotopography when compared to neurite outgrowth on smooth fibers. However, neurites extending from whole DRG cultured on laminin-coated fibers were not restricted by divoted or pitted surface nanotopography. Thus, neurites extending on laminin-coated fibers were able to extend long neurites even in the presence of surface divots or pits. To further explore this result, individual neurons isolated from dissociated DRG were seeded onto laminin-coated smooth, pitted, or divoted fibers. Interestingly, neurons on pitted or divoted fibers exhibited a 1.5-fold increase in total neurite length, and a 2.3 or 2.7-fold increase in neurite branching compared to neurons on smooth fibers, respectively. Based on these findings, we conclude that fiber roughness in the form of pits or divots can promote extension and branching of long neurites along aligned electrospun fibers in the presence of an extracellular matrix protein coating. Thus, aligned, electrospun fibers can be crafted to not only direct the extension of axons but to induce unique branching morphologies.
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Affiliation(s)
- Anthony R. D’Amato
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York, United States of America
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York,United States of America
| | - Devan L. Puhl
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York, United States of America
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York,United States of America
| | - Alexis M. Ziemba
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York, United States of America
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York,United States of America
| | - Christopher D. L. Johnson
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York, United States of America
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York,United States of America
| | - Janneke Doedee
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York, United States of America
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York,United States of America
| | - Jonathan Bao
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York, United States of America
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York,United States of America
| | - Ryan J. Gilbert
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York, United States of America
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York,United States of America
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Abstract
Tissue engineering (TE) and regenerative medicine are progressively developed areas due to many novel tissue replacements and implementation strategies. Increasing knowledge involving the fabrication of biomaterials with advanced physicochemical and biological characteristics, successful isolation and preparation of stem cells, incorporation of growth and differentiation factors, and biomimetic environments gives us a unique opportunity to develop various types of scaffolds for TE. The current strategies for soft tissue reconstitution or regeneration highlight the importance of novel regenerative therapies in cases of significant soft tissue loss and in cases of congenital defects, disease, trauma and ageing. Various types of biomaterials and scaffolds have been tested for soft tissue regeneration. The synthetic types of materials have gained great attention due to high versatility, tunability and easy functionalization for better biocompatibility. This article reviews the current materials that are usually the most used for the fabrication of scaffolds for soft TE; in addition, the types of scaffolds together with examples of their applications for the regenerative purposes of soft tissue, as well as their major physicochemical characteristics regarding the increased applicability of these materials in medicine, are reviewed.
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Affiliation(s)
- O Janoušková
- Department of Biological Models, Institute of Macromolecular Chemistry of the Czech Academy of Sciences, Prague 6, Czech Republic.
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59
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Wang L, Song D, Zhang X, Ding Z, Kong X, Lu Q, Kaplan DL. Silk-Graphene Hybrid Hydrogels with Multiple Cues to Induce Nerve Cell Behavior. ACS Biomater Sci Eng 2018; 5:613-622. [PMID: 33405825 DOI: 10.1021/acsbiomaterials.8b01481] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Cell behavior is dependent in part on chemical and physical cues from the extracellular matrix. Although the influence of various cues on cell behavior has been studied, challenges remain to incorporate multiple cues to matrix systems to optimize and control cell outcomes. Here, aligned silk fibroin (SF)-graphene hydrogels with preferable stiffness were developed through arranging SF nanofibers and SF-modified graphene sheets under an electric field. Different signals, such as bioactive graphene, nanofibrous structure, aligned topography, and mechanical stiffness, were tailored into the hydrogel system, providing niches for nerve cell responses. The desired adhesion, proliferation, differentiation, extensio,n and growth factor secretion of multiple nerve-related cells was achieved on these hydrogels, suggesting strong synergistic action through the combination of different cues. Based on the fabrication strategy, our present study provides a useful materials engineering platform for revealing cooperative influences of different signals on nerve cell behavior, to help in the understanding of cell-biomaterial interactions, with potential toward studies related to nerve regeneration.
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Affiliation(s)
- Lili Wang
- National Engineering Laboratory for Modern Silk & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215123, People's Republic of China
| | - Dawei Song
- Tai'an City Central Hospital, Taian, 271000, People's Republic of China
| | - Xiaoyi Zhang
- National Engineering Laboratory for Modern Silk & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215123, People's Republic of China
| | - Zhaozhao Ding
- National Engineering Laboratory for Modern Silk & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215123, People's Republic of China
| | - Xiangdong Kong
- College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China
| | - Qiang Lu
- National Engineering Laboratory for Modern Silk & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215123, People's Republic of China
| | - David L Kaplan
- Department of Biomedical Engineering, Tufts University, Medford, Massachusetts 02155, United States
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60
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Eslamian M, Khorrami M, Yi N, Majd S, Abidian MR. Electrospinning of Highly Aligned Fibers for Drug Delivery Applications. J Mater Chem B 2018; 7:224-232. [PMID: 31372224 DOI: 10.1039/c8tb01258j] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Electrospinning is a straightforward, cost-effective, and versatile technique for fabrication of polymeric micro/nanofibers with tunable structural properties. Controlling the size, shape, and spatial orientation of the electrospun fibers is crucial for utilization in drug delivery and tissue engineering applications. In this study, for the first time, we systematically investigate the effect of processing parameters, including voltage, syringe needle gauge, angular velocity of rotating wheel, syringe-collector distance, and flow rate on the size and alignment of electrospun PLGA fibers. Optimizing these parameters enabled us to produce highly aligned and monodisperse PLGA fibers (spatial orientation> 99% and coefficient of variation< 0.5). To assess the effect of fiber alignment on the release of encapsulated drugs from these fibers, we incorporated dexamethasone, an anti-inflammatory drug, within highly-aligned and randomly-oriented fibers with comparable diameters (~0.87 μm) and compared their release profiles. In-vitro release studies revealed that the aligned fibers had less burst release (~10.8% in 24 hr) and more sustained release (~8.8% average rate of change for 24 days) compared to the random fibers. Finally, the degradation modes of the aligned and random fibers after 25 days incubation were characterized and compared. The findings of this study can be applied for the development of 3D degradable aligned fibers for controlled drug release and tissue engineering applications.
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Affiliation(s)
- Mohammadjavad Eslamian
- Department of Biomedical Engineering, University of Houston, 3517 Cullen Blvd, Houston, TX 77204, USA
| | - Milad Khorrami
- Department of Biomedical Engineering, University of Houston, 3517 Cullen Blvd, Houston, TX 77204, USA
| | - Ning Yi
- Department of Materials Science and Engineering, Pennsylvania State University State College, PA 16802, USA
| | - Sheereen Majd
- Department of Biomedical Engineering, University of Houston, 3517 Cullen Blvd, Houston, TX 77204, USA
| | - Mohammad Reza Abidian
- Department of Biomedical Engineering, University of Houston, 3517 Cullen Blvd, Houston, TX 77204, USA
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61
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Frost HK, Andersson T, Johansson S, Englund-Johansson U, Ekström P, Dahlin LB, Johansson F. Electrospun nerve guide conduits have the potential to bridge peripheral nerve injuries in vivo. Sci Rep 2018; 8:16716. [PMID: 30425260 PMCID: PMC6233209 DOI: 10.1038/s41598-018-34699-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Accepted: 10/22/2018] [Indexed: 01/22/2023] Open
Abstract
Electrospinning can be used to mimic the architecture of an acellular nerve graft, combining microfibers for guidance, and pores for cellular infiltration. We made electrospun nerve guides, from polycaprolactone (PCL) or poly-L-lactic acid (PLLA), with aligned fibers along the insides of the channels and random fibers around them. We bridged a 10 mm rat sciatic nerve defect with the guides, and, in selected groups, added a cell transplant derived from autologous stromal vascular fraction (SVF). For control, we compared to hollow silicone tubes; or autologous nerve grafts. PCL nerve guides had a high degree of autotomy (8/43 rats), a negative indicator with respect to future usefulness, while PLLA supported axonal regeneration, but did not outperform autologous nerve grafts. Transplanted cells survived in the PLLA nerve guides, but axonal regeneration was not enhanced as compared to nerve guides alone. The inflammatory response was partially enhanced by the transplanted cells in PLLA nerve grafts; Schwann cells were poorly distributed compared to nerve guide without cells. Tailor-made electrospun nerve guides support axonal regeneration in vivo, and can act as vehicles for co-transplanted cells. Our results motivate further studies exploring novel nerve guides and the effect of stromal cell-derived factors on nerve generation.
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Affiliation(s)
- Hanna K Frost
- Department of Translational Medicine - Hand Surgery, Lund University, SE-205 02, Malmö, Sweden.
- Department of Hand Surgery, Skåne University Hospital, SE-205 02, Malmö, Sweden.
| | - Tomas Andersson
- Department of Biology, Lund University, SE-223 62, Lund, Sweden
| | | | - U Englund-Johansson
- Department of Clinical Sciences in Lund - Ophtalmology, Lund University, SE-211 84, Lund, Sweden
| | - Per Ekström
- Department of Clinical Sciences in Lund - Ophtalmology, Lund University, SE-211 84, Lund, Sweden
| | - Lars B Dahlin
- Department of Translational Medicine - Hand Surgery, Lund University, SE-205 02, Malmö, Sweden
- Department of Hand Surgery, Skåne University Hospital, SE-205 02, Malmö, Sweden
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Casadiegos S, Bustos RH, Fontanilla MR. Comparative evaluation of healing biomarkers in skin wound exudates using a nanobiosensor and histological analysis of full-thickness skin wounds grafted with multidirectional or unidirectional artificial dermis. J Tissue Eng Regen Med 2018; 12:2299-2308. [PMID: 30350342 DOI: 10.1002/term.2762] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 09/02/2018] [Accepted: 10/18/2018] [Indexed: 11/11/2022]
Abstract
Analysis of factors that play a role on the healing process in exudates from skin wounds might shed light on the effect that grafted artificial tissue has in wound regeneration and repair. The first objective of this work was to standardize an optic surface plasmon resonance method based on self-assembled monolayers to quantify healing mediator factors (angiopoietin-2, epidermal growth factor, tumour necrosis factor-α, transforming growth factor-β1, and vascular endothelial growth factor) in wound exudates. Optimal conditions for self-assembling of alkanethiol monolayers, immobilization of antibodies antifactors, and regeneration of sensor surfaces were established. A second objective was to compare healing of wounds grafted with artificial dermis with wounds left to heal by secondary intention (control) in a lagomorph model of full-thickness skin wound. Each animal included in this study had a control wound and an identical contralateral wound grafted with artificial dermis that was made by seeding autologous skin fibroblasts into unidirectional or multidirectional collagen type I scaffolds. Histological and histomorphometric analyses were carried out when animals were sacrificed, in addition to quantifying the factors in the exudates of wounds sampled 3 days after surgery. There were significant differences between the concentrations of evaluated factors in the exudates from grafted and control wounds. This finding coincides with differences observed in the histological and histomorphometric analyses of repaired tissue formed in treated and control wounds.
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Affiliation(s)
- Sergio Casadiegos
- Tissue Engineering Group, Department of Pharmacy, National University of Colombia, Bogotá, Colombia
| | - Rosa Helena Bustos
- Tissue Engineering Group, Department of Pharmacy, National University of Colombia, Bogotá, Colombia
| | - Marta R Fontanilla
- Tissue Engineering Group, Department of Pharmacy, National University of Colombia, Bogotá, Colombia
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63
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Shah Hosseini N, Simon B, Messaoud T, Khenoussi N, Schacher L, Adolphe D. Quantitative approaches of nanofibers organization for biomedical patterned nanofibrous scaffold by image analysis. J Biomed Mater Res A 2018; 106:2963-2972. [DOI: 10.1002/jbm.a.36485] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 05/22/2018] [Accepted: 05/31/2018] [Indexed: 11/12/2022]
Affiliation(s)
- Neda Shah Hosseini
- Laboratoire de Physique et Mécanique Textiles EA 4365-UHA Mulhouse; Mulhouse France
| | - Bertrand Simon
- Laboratoire de Modélisation Intelligence Processus Systèmes (MIPS) EA 2332-UHA Mulhouse; Mulhouse France
| | - Tahani Messaoud
- École nationale d'ingénierie; Université de Monastir; Monastir Tunisia
| | - Nabyl Khenoussi
- Laboratoire de Physique et Mécanique Textiles EA 4365-UHA Mulhouse; Mulhouse France
| | - Laurence Schacher
- Laboratoire de Physique et Mécanique Textiles EA 4365-UHA Mulhouse; Mulhouse France
| | - Dominique Adolphe
- Laboratoire de Physique et Mécanique Textiles EA 4365-UHA Mulhouse; Mulhouse France
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Nune M, Manchineella S, T G, K S N. Melanin incorporated electroactive and antioxidant silk fibroin nanofibrous scaffolds for nerve tissue engineering. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 94:17-25. [PMID: 30423699 DOI: 10.1016/j.msec.2018.09.014] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 08/27/2018] [Accepted: 09/05/2018] [Indexed: 02/03/2023]
Abstract
Nerve restoration and repair in the central nervous system is complicated and requires several factors to be considered while designing the scaffolds like being bioactive as well as having neuroinductive, neuroconductive and antioxidant properties. Aligned electrospun nanofibers provide necessary guidance and topographical cues required for directing the axonal and neurite outgrowth during regeneration. Conduction of nerve impulses is a mandatory feature of a typical nerve. The neuro-conductive property can be imparted by blending the biodegradable, bioactive polymers with conductive polymers. This will provide additional features, i.e., electrical cues to the already existing topographical and bioactive cues in order to make it a more multifaceted neuroregenerative approach. Hence in the present study, we used a combination of silk fibroin and melanin for the fabrication of random and aligned electrospun nanofibrous composite scaffolds. We performed the physico-chemical characterization and also assessed their antioxidant properties. We also evaluated their neurogenic potential using human neuroblastoma cells (SH-SY5Y) for their cellular viability, proliferation, adhesion and differentiation levels. Designed nanofibrous scaffolds had adequate physical properties suitable as neural substrates to promote neuronal growth and regeneration. They stimulated the neuroblastoma cell attachment and viability indicating their biocompatible nature. Silk/melanin composite scaffolds have specifically exhibited high antioxidant nature proven by the radical scavenging activity. Additionally, the melanin incorporated aligned silk fibroin scaffolds promoted the cell differentiation into neurons and orientation along their axis. Our results confirmed the potential of melanin incorporated aligned silk fibroin scaffolds as the promising candidates for effective nerve regeneration and recovery.
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Affiliation(s)
- Manasa Nune
- Chemistry and Physics of Materials Unit School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru 560064, Karnataka, India
| | - Shivaprasad Manchineella
- Bioorganic Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru 560064, Karnataka, India
| | - Govindaraju T
- Bioorganic Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru 560064, Karnataka, India
| | - Narayan K S
- School of Advanced Materials and Department of Neurosciences, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru 560064, Karnataka, India.
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65
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Miller RJ, Chan CY, Rastogi A, Grant AM, White CM, Bette N, Schaub NJ, Corey JM. Combining electrospun nanofibers with cell-encapsulating hydrogel fibers for neural tissue engineering. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2018; 29:1625-1642. [PMID: 29862935 PMCID: PMC7446748 DOI: 10.1080/09205063.2018.1479084] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 05/17/2018] [Indexed: 10/14/2022]
Abstract
A promising component of biomaterial constructs for neural tissue engineering are electrospun fibers, which differentiate stem cells and neurons as well as direct neurite growth. However, means of protecting neurons, glia, and stem cells seeded on electrospun fibers between lab and surgical suite have yet to be developed. Here we report an effort to accomplish this using cell-encapsulating hydrogel fibers made by interfacial polyelectrolyte complexation (IPC). IPC-hydrogel fibers were created by interfacing acid-soluble chitosan (AsC) and cell-containing alginate and spinning them on bundles of aligned electrospun fibers. Primary spinal astrocytes, cortical neurons, or L929 fibroblasts were mixed into alginate hydrogels prior to IPC-fiber spinning. The viability of each cell type was assessed at 30 min, 4 h, 1 d, and 7 d after encapsulation in IPC hydrogels. Some neurons were encapsulated in IPC-hydrogel fibers made from water-soluble chitosan (WsC). Neurons were also stained with Tuj1 and assessed for neurite extension. Neuron survival in AsC-fibers was worse than astrocytes in AsC-fibers (p < 0.05) and neurons in WsC-fibers (p < 0.05). As expected, neuron and glia survival was worse than L929 fibroblasts (p < 0.05). Neurons in IPC-hydrogel fibers fabricated with WsC extended neurites robustly, while none in AsC fibers did. Neurons remaining inside IPC-hydrogel fibers extended neurites inside them, while others de-encapsulated, extending neurites on electrospun fibers, which did not fully integrate with IPC-hydrogel fibers. This study demonstrates that primary neurons and astrocytes can be encapsulated in IPC-hydrogel fibers at good percentages of survival. IPC hydrogel technology may be a useful tool for encapsulating neural and other cells on electrospun fiber scaffolds.
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Affiliation(s)
- Ryan J. Miller
- Department of Research and Geriatric Research Education and Clinical Center (GRECC), VA Ann Arbor Healthcare System, Ann Arbor, Michigan 48105
| | - Cheook Y. Chan
- Department of Research and Geriatric Research Education and Clinical Center (GRECC), VA Ann Arbor Healthcare System, Ann Arbor, Michigan 48105
- Undergraduate Research Opportunity Program, The University of Michigan, Ann Arbor, MI 48109, USA
| | - Arjun Rastogi
- Department of Research and Geriatric Research Education and Clinical Center (GRECC), VA Ann Arbor Healthcare System, Ann Arbor, Michigan 48105
| | - Allison M. Grant
- Department of Research and Geriatric Research Education and Clinical Center (GRECC), VA Ann Arbor Healthcare System, Ann Arbor, Michigan 48105
- Undergraduate Research Opportunity Program, The University of Michigan, Ann Arbor, MI 48109, USA
| | - Christina M. White
- Department of Research and Geriatric Research Education and Clinical Center (GRECC), VA Ann Arbor Healthcare System, Ann Arbor, Michigan 48105
| | - Nicole Bette
- Department of Research and Geriatric Research Education and Clinical Center (GRECC), VA Ann Arbor Healthcare System, Ann Arbor, Michigan 48105
| | - Nicholas J. Schaub
- Department of Research and Geriatric Research Education and Clinical Center (GRECC), VA Ann Arbor Healthcare System, Ann Arbor, Michigan 48105
- Department of Neurology, The University of Michigan, Ann Arbor, MI 48109, USA
| | - Joseph M. Corey
- Department of Research and Geriatric Research Education and Clinical Center (GRECC), VA Ann Arbor Healthcare System, Ann Arbor, Michigan 48105
- Department of Neurology, The University of Michigan, Ann Arbor, MI 48109, USA
- Department of Biomedical Engineering, The University of Michigan, Ann Arbor, MI 48109, USA
- Macromolecular Science and Engineering Program, The University of Michigan, Ann Arbor, MI 48109, USA
- Neuroscience Graduate Program, The University of Michigan, Ann Arbor, MI 48109, USA
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66
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Silantyeva EA, Nasir W, Carpenter J, Manahan O, Becker ML, Willits RK. Accelerated neural differentiation of mouse embryonic stem cells on aligned GYIGSR-functionalized nanofibers. Acta Biomater 2018; 75:129-139. [PMID: 29879551 PMCID: PMC6774047 DOI: 10.1016/j.actbio.2018.05.052] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Revised: 05/17/2018] [Accepted: 05/30/2018] [Indexed: 12/09/2022]
Abstract
Substrates for embryonic stem cell culture are typified by poorly defined xenogenic, whole proteins or cellular components that are difficult and expensive to generate, characterize, and recapitulate. Herein, the generation of well-defined scaffolds of Gly-Tyr-Ile-Gly-Ser-Arg (GYIGSR) peptide-functionalized poly(ε-caprolactone) (PCL) aligned nanofibers are used to accelerate the neural lineage commitment and differentiation of D3 mouse embryonic stem cells (mESCs). Gene expression trends and immunocytochemistry analysis were similar to laminin-coated glass, and indicated an earlier differentiation progression than D3 mESCs on laminin. Further, GYIGSR-functionalized nanofiber substrates yielded an increased gene expression of Sox1, a neural progenitor cell marker, and Tubb3, Cdh2, Syp, neuronal cell markers, at early time points. In addition, guidance of neurites was found to parallel the fiber direction. We demonstrate the fabrication of a well-defined, xeno-free functional nanofiber scaffold and demonstrates its use as a surrogate for xenogenic and complex matrixes currently used for the neural differentiation of stem cells ex vivo. STATEMENT OF SIGNIFICANCE In this paper, we report the use of GYIGSR-functionalized poly(ε-caprolactone) aligned nanofibers as a tool to accelerate the neural lineage commitment and differentiation of D3 mouse embryonic stem cells. The results indicate that functional nanofiber substrates promote faster differentiation than laminin coated substrates. The data suggest that aligned nanofibers and post-electrospinning surface modification with bioactive species can be combined to produce translationally relevant xeno-free substrates for stem cell therapy. Future development efforts are focused on additional bioactive species that are able to function as surrogates for other xenogenic factors found in differentiation media.
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Affiliation(s)
- Elena A Silantyeva
- Department of Polymer Science, The University of Akron, Akron, OH 44325, United States
| | - Wafaa Nasir
- Biomedical Engineering, The University of Akron, Akron, OH 44325, United States
| | | | - Olivia Manahan
- Department of Polymer Science, The University of Akron, Akron, OH 44325, United States
| | - Matthew L Becker
- Department of Polymer Science, The University of Akron, Akron, OH 44325, United States; Biomedical Engineering, The University of Akron, Akron, OH 44325, United States.
| | - Rebecca K Willits
- Biomedical Engineering, The University of Akron, Akron, OH 44325, United States
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67
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Electrically polarized PLLA nanofibers as neural tissue engineering scaffolds with improved neuritogenesis. Colloids Surf B Biointerfaces 2018; 167:93-103. [DOI: 10.1016/j.colsurfb.2018.03.050] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 03/22/2018] [Accepted: 03/29/2018] [Indexed: 12/13/2022]
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68
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Granato AEC, Ribeiro AC, Marciano FR, Rodrigues BVM, Lobo AO, Porcionatto M. Polypyrrole increases branching and neurite extension by Neuro2A cells on PBAT ultrathin fibers. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2018; 14:1753-1763. [PMID: 29778889 DOI: 10.1016/j.nano.2018.05.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2018] [Revised: 04/27/2018] [Accepted: 05/03/2018] [Indexed: 12/16/2022]
Abstract
We present a methodology for production and application of electrospun hybrid materials containing commercial polyester (poly (butylene adipate-co-terephthalate; PBAT), and a conductive polymer (polypyrrole; PPy) as scaffold for neuronal growth and differentiation. The physical-chemical properties of the scaffolds and optimization of the electrospinning parameters are presented. The electrospun scaffolds are biocompatible and allow proper adhesion and spread of mesenchymal stem cells (MSCs). Fibers produced with PBAT with or without PPy were used as scaffold for Neuro2a mouse neuroblastoma cells adhesion and differentiation. Neuro2a adhered to PBAT and PBAT/PPy2% scaffolds without laminin coating. However, Neuro2a failed to differentiate in PBAT when stimulated by treatment with retinoic acid (RA), but differentiated in PBAT/PPy2% fibers. We hypothesize that PBAT hydrophobicity inhibited proper spreading and further differentiation, and inhibition was overcome by coating the PBAT fibers with laminin. We conclude that fibers produced with the combination of PBAT and PPy can support neuronal differentiation.
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Affiliation(s)
- Alessandro E C Granato
- Department of Biochemistry, Neurobiology Lab, Escola Paulista de Medicina, Universidade Federal São Paulo, São Paulo
| | - André C Ribeiro
- Institute of Science and Technology, Universidade Brasil, São Paulo, SP, Brazil
| | - Fernanda R Marciano
- Institute of Science and Technology, Universidade Brasil, São Paulo, SP, Brazil; Department of Chemical Engineering, Northeastern University, Boston, MA, USA
| | - Bruno V M Rodrigues
- Institute of Science and Technology, Universidade Brasil, São Paulo, SP, Brazil; Plasma and Processes Laboratory, Instituto Tecnológico de Aeronáutica, São Jose dos Campos, SP, Brazil
| | - Anderson O Lobo
- Institute of Science and Technology, Universidade Brasil, São Paulo, SP, Brazil; Interdisciplinary Laboratory for Advanced Materials, Materials Science and Engineering graduation program, Technology Center, Universidade Federal do Piauí, Teresina, PI, Brazil; Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA.
| | - Marimelia Porcionatto
- Department of Biochemistry, Neurobiology Lab, Escola Paulista de Medicina, Universidade Federal São Paulo, São Paulo.
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69
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Arbade GK, Jathar S, Tripathi V, Patro TU. Antibacterial, sustained drug release and biocompatibility studies of electrospun poly(
ε
-caprolactone)/chloramphenicol blend nanofiber scaffolds. Biomed Phys Eng Express 2018. [DOI: 10.1088/2057-1976/aac1a4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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70
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Ziemba AM, Lane KP, San Segundo IM, D'Amato AR, Mason AK, Sexton RJ, Casajus H, Gross RA, Corr DT, Gilbert RJ. Poly-l-lactic acid- co-poly(pentadecalactone) Electrospun Fibers Result in Greater Neurite Outgrowth of Chick Dorsal Root Ganglia in Vitro Compared to Poly-l-lactic Acid Fibers. ACS Biomater Sci Eng 2018; 4:1491-1497. [PMID: 33445306 DOI: 10.1021/acsbiomaterials.8b00013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Electrospun poly-l-lactic acid (PLLA) fiber scaffolds are used to direct axonal extension in neural engineering models. We aimed to improve the efficacy of these fibers in promoting neurite outgrowth by altering surface topography and reducing fiber elastic modulus through the incorporation of a compatibilized blend, poly-l-lactic acid-poly(pentadecalactone) (PLLA-PPDL) into the solution prior to electrospinning. PLLA+PLLA-PPDL fibers had a larger diameter, increased surface nanotopography, and lower glass transition temperature than PLLA fibers but had similar mechanical properties. Increases in neurite outgrowth on PLLA+PLLA-PPDL fibers were observed, potentially due to the significantly increased diameter and surface coverage with nanotopography. Ultimately, these results suggest that greater electrospun fiber diameter and surface topography may contribute to increases in neurite outgrowth.
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Affiliation(s)
- Alexis M Ziemba
- Center for Biotechnology and Interdisciplinary Sciences, Rensselaer Polytechnic Institute, 1623 15th Street, Troy, New York 12180, United States
| | - Keith P Lane
- Center for Biotechnology and Interdisciplinary Sciences, Rensselaer Polytechnic Institute, 1623 15th Street, Troy, New York 12180, United States
| | | | - Anthony R D'Amato
- Center for Biotechnology and Interdisciplinary Sciences, Rensselaer Polytechnic Institute, 1623 15th Street, Troy, New York 12180, United States
| | | | | | | | - Richard A Gross
- Center for Biotechnology and Interdisciplinary Sciences, Rensselaer Polytechnic Institute, 1623 15th Street, Troy, New York 12180, United States
| | | | - Ryan J Gilbert
- Center for Biotechnology and Interdisciplinary Sciences, Rensselaer Polytechnic Institute, 1623 15th Street, Troy, New York 12180, United States
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71
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Song SJ, Shin YC, Kim SE, Kwon IK, Lee JH, Hyon SH, Han DW, Kim B. Aligned laminin core-polydioxanone/collagen shell fiber matrices effective for neuritogenesis. Sci Rep 2018; 8:5570. [PMID: 29615798 PMCID: PMC5882927 DOI: 10.1038/s41598-018-23958-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 03/23/2018] [Indexed: 11/21/2022] Open
Abstract
Neural tissue regeneration is a significant challenge, because severe nerve injury is quite difficult to regenerate spontaneously. Although, many studies have been devoted to promote nerve regeneration, there are still many technical challenges to achieve satisfactory results. In this study, we designed biomimetic matrices composed of aligned laminin core-polydioxanone/collagen shell (Lam-PDO/Col) fibers, which can provide both topographical and biochemical cues for promoting neuritogenesis. The aligned Lam-PDO/Col core-shell fiber matrices were fabricated by magnetic field-assisted electrospinning with the coaxial system, and their potential as biofunctional scaffolds for promoting neuritogenesis was explored. It was demonstrated that the aligned Lam-PDO/Col core-shell fibers were successfully fabricated, and the laminin in the core of fibers was steadily and continuously released from fibers. In addition, the cellular behaviors of hippocampal neuronal cells on the matrices were significantly enhanced. Moreover, the aligned Lam-PDO/Col fiber matrices effectively improved and guided neurite outgrowth as well as the neurogenic differentiation by providing both topographical and biochemical cues through aligned fiber structure and sustained release of laminin. Collectively, it is suggested that the aligned Lam-PDO/Col core-shell fiber matrices are one of the most promising approaches for promoting neuritogenesis and neural tissue regeneration.
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Affiliation(s)
- Su-Jin Song
- Department of Cogno-Mechatronics Engineering, College of Nanoscience & Nanotechnology, Pusan National University, Busan, 46241, Republic of Korea
| | - Yong Cheol Shin
- Research Center for Energy Convergence Technology, Pusan National University, Busan, 46241, Republic of Korea
| | - Sung Eun Kim
- Department of Cogno-Mechatronics Engineering, College of Nanoscience & Nanotechnology, Pusan National University, Busan, 46241, Republic of Korea
| | - Il Keun Kwon
- Department of Dental Materials, School of Dentistry, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Jong-Ho Lee
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Seoul National University, Seoul, 03080, Republic of Korea
| | - Suong-Hyu Hyon
- Center for Fiber and Textile Science, Kyoto Institute of Technology, Matsugasaki, Kyoto, 606-8585, Japan
| | - Dong-Wook Han
- Department of Cogno-Mechatronics Engineering, College of Nanoscience & Nanotechnology, Pusan National University, Busan, 46241, Republic of Korea.
| | - Bongju Kim
- Dental Life Science Research Institute, Seoul National University Dental Hospital, Seoul, 03080, Republic of Korea.
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72
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Wieringa PA, Gonçalves de Pinho AR, Micera S, Wezel RJA, Moroni L. Biomimetic Architectures for Peripheral Nerve Repair: A Review of Biofabrication Strategies. Adv Healthc Mater 2018; 7:e1701164. [PMID: 29349931 DOI: 10.1002/adhm.201701164] [Citation(s) in RCA: 80] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Revised: 11/13/2017] [Indexed: 12/19/2022]
Abstract
Biofabrication techniques have endeavored to improve the regeneration of the peripheral nervous system (PNS), but nothing has surpassed the performance of current clinical practices. However, these current approaches have intrinsic limitations that compromise patient care. The "gold standard" autograft provides the best outcomes but requires suitable donor material, while implantable hollow nerve guide conduits (NGCs) can only repair small nerve defects. This review places emphasis on approaches that create structural cues within a hollow NGC lumen in order to match or exceed the regenerative performance of the autograft. An overview of the PNS and nerve regeneration is provided. This is followed by an assessment of reported devices, divided into three major categories: isotropic hydrogel fillers, acting as unstructured interluminal support for regenerating nerves; fibrous interluminal fillers, presenting neurites with topographical guidance within the lumen; and patterned interluminal scaffolds, providing 3D support for nerve growth via structures that mimic native PNS tissue. Also presented is a critical framework to evaluate the impact of reported outcomes. While a universal and versatile nerve repair strategy remains elusive, outlined here is a roadmap of past, present, and emerging fabrication techniques to inform and motivate new developments in the field of peripheral nerve regeneration.
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Affiliation(s)
- Paul A. Wieringa
- Department of Complex Tissue RegenerationMERLN Institute for Technology‐Inspired Regenerative MedicineMaastricht University Universiteitssingel 40 Maastricht 6229 ER The Netherlands
| | - Ana Rita Gonçalves de Pinho
- Tissue Regeneration DepartmentMIRA InstituteUniversity of Twente Drienerlolaan 5 Enschede 7522 NB The Netherlands
| | - Silvestro Micera
- BioRobotics InstituteScuola Superiore Sant'Anna Viale Rinaldo Piaggio 34 Pontedera 56025 Italy
- Translational Neural Engineering LaboratoryEcole Polytechnique Federale de Lausanne Ch. des Mines 9 Geneva CH‐1202 Switzerland
| | - Richard J. A. Wezel
- BiophysicsDonders Institute for BrainCognition and BehaviourRadboud University Kapittelweg 29 Nijmegen 6525 EN The Netherlands
- Biomedical Signals and SystemsMIRA InstituteUniversity of Twente Drienerlolaan 5 Enschede 7522 NB The Netherlands
| | - Lorenzo Moroni
- Department of Complex Tissue RegenerationMERLN Institute for Technology‐Inspired Regenerative MedicineMaastricht University Universiteitssingel 40 Maastricht 6229 ER The Netherlands
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73
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Sarker M, Naghieh S, McInnes AD, Schreyer DJ, Chen X. Strategic Design and Fabrication of Nerve Guidance Conduits for Peripheral Nerve Regeneration. Biotechnol J 2018; 13:e1700635. [PMID: 29396994 DOI: 10.1002/biot.201700635] [Citation(s) in RCA: 108] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 01/25/2018] [Indexed: 12/23/2022]
Abstract
Nerve guidance conduits (NGCs) have been drawing considerable attention as an aid to promote regeneration of injured axons across damaged peripheral nerves. Ideally, NGCs should include physical and topographic axon guidance cues embedded as part of their composition. Over the past decades, much progress has been made in the development of NGCs that promote directional axonal regrowth so as to repair severed nerves. This paper briefly reviews the recent designs and fabrication techniques of NGCs for peripheral nerve regeneration. Studies associated with versatile design and preparation of NGCs fabricated with either conventional or rapid prototyping (RP) techniques have been examined and reviewed. The effect of topographic features of the filler material as well as porous structure of NGCs on axonal regeneration has also been examined from the previous studies. While such strategies as macroscale channels, lumen size, groove geometry, use of hydrogel/matrix, and unidirectional freeze-dried surface are seen to promote nerve regeneration, shortcomings such as axonal dispersion and wrong target reinnervation still remain unsolved. On this basis, future research directions are identified and discussed.
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Affiliation(s)
- Md Sarker
- Division of Biomedical Engineering College of Engineering University of Saskatchewan, 57 campus drive, SK S7N 5A9, Saskatoon, SK, Canada
| | - Saman Naghieh
- Division of Biomedical Engineering College of Engineering University of Saskatchewan, 57 campus drive, SK S7N 5A9, Saskatoon, SK, Canada
| | - Adam D McInnes
- Division of Biomedical Engineering College of Engineering University of Saskatchewan, 57 campus drive, SK S7N 5A9, Saskatoon, SK, Canada
| | - David J Schreyer
- Department of Anatomy and Cell Biology College of Medicine University of Saskatchewan, Saskatoon, SK S7N 5A2, Canada
| | - Xiongbiao Chen
- Division of Biomedical Engineering College of Engineering University of Saskatchewan, 57 campus drive, SK S7N 5A9, Saskatoon, SK, Canada.,Department of Mechanical Engineering College of Engineering University of Saskatchewan, Saskatoon, SK S7N 5A9, Canada
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74
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Hsu CC, Serio A, Amdursky N, Besnard C, Stevens MM. Fabrication of Hemin-Doped Serum Albumin-Based Fibrous Scaffolds for Neural Tissue Engineering Applications. ACS APPLIED MATERIALS & INTERFACES 2018; 10:5305-5317. [PMID: 29381329 PMCID: PMC5814958 DOI: 10.1021/acsami.7b18179] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Accepted: 01/12/2018] [Indexed: 05/06/2023]
Abstract
Neural tissue engineering (TE) represents a promising new avenue of therapy to support nerve recovery and regeneration. To recreate the complex environment in which neurons develop and mature, the ideal biomaterials for neural TE require a number of properties and capabilities including the appropriate biochemical and physical cues to adsorb and release specific growth factors. Here, we present neural TE constructs based on electrospun serum albumin (SA) fibrous scaffolds. We doped our SA scaffolds with an iron-containing porphyrin, hemin, to confer conductivity, and then functionalized them with different recombinant proteins and growth factors to ensure cell attachment and proliferation. We demonstrated the potential for these constructs combining topographical, biochemical, and electrical stimuli by testing them with clinically relevant neural populations derived from human induced pluripotent stem cells (hiPSCs). Our scaffolds could support the attachment, proliferation, and neuronal differentiation of hiPSC-derived neural stem cells (NSCs), and were also able to incorporate active growth factors and release them over time, which modified the behavior of cultured cells and substituted the need for growth factor supplementation by media change. Electrical stimulation on the doped SA scaffold positively influenced the maturation of neuronal populations, with neurons exhibiting more branched neurites compared to controls. Through promotion of cell proliferation, differentiation, and neurite branching of hiPSC-derived NSCs, these conductive SA fibrous scaffolds are of broad application in nerve regeneration strategies.
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Affiliation(s)
- Chia-Chen Hsu
- Department of Materials, Imperial College London, London SW7 2AZ, U.K.
- Department of Bioengineering, Imperial College London, London SW7 2AZ, U.K.
- Institute
of Biomedical Engineering, Imperial College
London, London SW7 2AZ, U.K.
| | - Andrea Serio
- Department of Materials, Imperial College London, London SW7 2AZ, U.K.
- Department of Bioengineering, Imperial College London, London SW7 2AZ, U.K.
- Institute
of Biomedical Engineering, Imperial College
London, London SW7 2AZ, U.K.
| | - Nadav Amdursky
- Department of Materials, Imperial College London, London SW7 2AZ, U.K.
- Department of Bioengineering, Imperial College London, London SW7 2AZ, U.K.
- Institute
of Biomedical Engineering, Imperial College
London, London SW7 2AZ, U.K.
| | - Cyril Besnard
- Department of Materials, Imperial College London, London SW7 2AZ, U.K.
| | - Molly M. Stevens
- Department of Materials, Imperial College London, London SW7 2AZ, U.K.
- Department of Bioengineering, Imperial College London, London SW7 2AZ, U.K.
- Institute
of Biomedical Engineering, Imperial College
London, London SW7 2AZ, U.K.
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75
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Belu A, Yilmaz M, Neumann E, Offenhäusser A, Demirel G, Mayer D. Asymmetric, nano-textured surfaces influence neuron viability and polarity. J Biomed Mater Res A 2018; 106:1634-1645. [PMID: 29427541 DOI: 10.1002/jbm.a.36363] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 01/09/2018] [Accepted: 02/01/2018] [Indexed: 02/06/2023]
Abstract
Three dimensional, nanostructured surfaces have attracted considerable attention in biomedical research since they have proven to represent a powerful platform to influence cell fate. In particular, nanorods and nanopillars possess great potential for the control of cell adhesion and differentiation, gene and biomolecule delivery, optical and electrical stimulation and recording, as well as cell patterning. Here, we investigate the influence of asymmetric poly(dichloro-p-xylene) (PPX) columnar films on the adhesion and maturation of cortical neurons. We show that nanostructured films with dense, inclined polymer columns can support viable primary neuronal culture. The cell-nanostructure interface is characterized showing a minimal cell penetration but strong adhesion on the surface. Moreover, we quantify the influence of the nano-textured surface on the neural development (soma size, neuritogenesis, and polarity) in comparison to a planar PPX sample. We demonstrate that the nanostructures facilitates an enhancement in neurite branching as well as elongation of axons and growth cones. Furthermore, we show for the first time that the asymmetric orientation of polymeric nanocolumns strongly influences the initiation direction of the axon formation. These results evidence that 3D nano-topographies can significantly change neural development and can be used to engineer axon elongation. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 1634-1645, 2018.
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Affiliation(s)
- Andreea Belu
- Institute of Complex Systems, ICS-8, Forschungszentrum Jülich GmbH, Jülich, 52425, Germany.,JARA-SOFT, Jülich, 52425, Germany
| | - Mehmet Yilmaz
- Bio-inspired Materials Research Laboratory (BIMREL), Gazi University, Ankara, Turkey
| | - Elmar Neumann
- Institute of Complex Systems, ICS-8, Forschungszentrum Jülich GmbH, Jülich, 52425, Germany.,JARA-SOFT, Jülich, 52425, Germany
| | - Andreas Offenhäusser
- Institute of Complex Systems, ICS-8, Forschungszentrum Jülich GmbH, Jülich, 52425, Germany.,JARA-SOFT, Jülich, 52425, Germany
| | - Gokhan Demirel
- Bio-inspired Materials Research Laboratory (BIMREL), Gazi University, Ankara, Turkey
| | - Dirk Mayer
- Institute of Complex Systems, ICS-8, Forschungszentrum Jülich GmbH, Jülich, 52425, Germany.,JARA-SOFT, Jülich, 52425, Germany
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76
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Thompson R, Sakiyama-Elbert S. Using biomaterials to promote pro-regenerative glial phenotypes after nervous system injuries. ACTA ACUST UNITED AC 2018; 13:024104. [PMID: 29186011 DOI: 10.1088/1748-605x/aa9e23] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Trauma to either the central or peripheral nervous system (PNS) often leads to significant loss of function and disability in patients. This high rate of long-term disability is due to the overall limited regenerative potential of nervous tissue, even though the PNS has more regenerative potential than the central nervous system (CNS). The supporting glial cells in the periphery, Schwann cells, are part of the reason for the improved recovery observed in the PNS. In the CNS, the glial populations, astrocytes and oligodendrocytes (OLs), do not have as much potential to promote regeneration and are at times inhibitory to neuronal growth. In particular, the inhibitory roles astrocytes play following trauma has led to a historical focus on neurons and OLs instead of astrocytes. Recently, this focus has shifted as new, regenerative astrocyte phenotypes have been described. From these observations, glial cells clearly play critical roles in native recovery pathways in both the CNS and PNS. This makes the ability to manipulate both transplanted and native glial cell phenotypes a potentially successful strategy to improve nerve injury outcomes. This review focuses on factors that cause glial cells to adopt repair phenotypes and biomaterials that manipulate and/or harness these glial phenotypes.
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Affiliation(s)
- Russell Thompson
- Department of Biomedical Engineering, University of Texas at Austin 107 W Dean Keeton, Austin, TX 78712, United States of America. Department of Biomedical Engineering, Washington University in St. Louis, 1 Brooking Drive, St. Louis, MO 63130, United States of America
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77
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Kim MH, Park JH, Joo S, Hong D, Park M, Choi JY, Moon HW, Kim YG, Kang K, Choi IS. Accelerated Development of Hippocampal Neurons and Limited Adhesion of Astrocytes on Negatively Charged Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:1767-1774. [PMID: 29278669 DOI: 10.1021/acs.langmuir.7b03132] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This work examines the development of primary neurons and astrocytes on thoroughly controlled functional groups. Negatively charged surfaces presenting carboxylate (COO-) or sulfonate (SO3-) groups prove beneficial to neuronal behavior, in spite of their supposed repulsive electrostatic interactions with cellular membranes. The adhesion and survival of primary hippocampal neurons on negatively charged surfaces are comparable to or slightly better than those on positively charged (poly-d-lysine-coated) surfaces, and neuritogenesis and neurite outgrowth are accelerated on COO- and SO3- surfaces. Moreover, such favorable influences of the negatively charged surfaces are only seen in neurons but not for astrocytes. Our results indicate that the in vitro developmental behavior of primary hippocampal neurons is sophisticatedly modulated by angstrom-sized differences in chemical structure or the charge density of the surface. We believe that this work provides new implications for understanding neuron-material interfaces as well as for establishing new ways to fabricate neuro-active surfaces.
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Affiliation(s)
- Mi-Hee Kim
- Center for Cell-Encapsulation Research, Department of Chemistry, KAIST , Daejeon 34141, Korea
| | - Ji Hun Park
- Center for Cell-Encapsulation Research, Department of Chemistry, KAIST , Daejeon 34141, Korea
| | - Sunghoon Joo
- Center for Cell-Encapsulation Research, Department of Chemistry, KAIST , Daejeon 34141, Korea
| | - Daewha Hong
- Department of Chemistry and Chemistry Institute of Functional Materials, Pusan National University , Busan 46241, Korea
| | - Matthew Park
- Center for Cell-Encapsulation Research, Department of Chemistry, KAIST , Daejeon 34141, Korea
| | - Ji Yu Choi
- Center for Cell-Encapsulation Research, Department of Chemistry, KAIST , Daejeon 34141, Korea
| | - Hye Won Moon
- Center for Cell-Encapsulation Research, Department of Chemistry, KAIST , Daejeon 34141, Korea
| | - Yang-Gyun Kim
- Department of Chemistry, Sungkyunkwan University , Suwon, Gyeonggi 16419, Korea
| | - Kyungtae Kang
- Department of Applied Chemistry, Kyung Hee University , Yongin, Gyeonggi 17104, Korea
| | - Insung S Choi
- Center for Cell-Encapsulation Research, Department of Chemistry, KAIST , Daejeon 34141, Korea
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78
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Xu Q, Jin L, Li C, Kuddannayai S, Zhang Y. The effect of electrical stimulation on cortical cells in 3D nanofibrous scaffolds. RSC Adv 2018; 8:11027-11035. [PMID: 35541524 PMCID: PMC9079102 DOI: 10.1039/c8ra01323c] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Accepted: 03/14/2018] [Indexed: 11/21/2022] Open
Abstract
Cellular behaviors are significantly affected by cellular microenvironment, including mechanical supports, electrical and chemical cues, etc. Three dimensional conductive nanofibers (3D-CNFs) provide the capability to regulate cellular behaviors using mechanical, geometrical and electrical cues together, which are especially important in neural tissue engineering. However, very few studies were conducted to address combined effects of 3D nanofibrous scaffolds and electrical stimulation (ES) on cortical cell cultures. In the present study, polypyrrole (PPy)-coated electrospun polyacrylonitrile (PAN) nanofibers with a 3D structure were successfully prepared for the cortical cell culture, which was compared to cells cultured in the 2D-CNFs meshes, as well as that in the bare PAN nanofibers, both in 2D and 3D. While smooth PAN 3D nanofibers showed dispersive cell distribution, PPy coated 3D-CNFs showed clusters of cortical cells. The combined effects of 3D conductive nanofibers and ES on neurons and glial cells were studied. Different from previous observations on 2D substrates, pulsed electrical stimulations could prevent formation of cell clusters if applied at the beginning of culture, but could not disperse the clusters of cortical cells already formed. Furthermore, the electrical stimulations improved the proliferation of glial cells and accelerate neuron maturation. This study enriched the growing body of evidence for using electrical stimulation and 3D conductive nanofibers to control the culture of cortical cells, which have broad applications in neural engineering, such as implantation, biofunctional in vitro model, etc. Cellular behaviors are significantly affected by cellular microenvironment, including mechanical supports, electrical and chemical cues, etc.![]()
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Affiliation(s)
- Qinwei Xu
- School of Mechanical & Aerospace Engineering
- Nanyang Technological University
- Singapore 639798
- Singapore
| | - Lin Jin
- Henan Provincial People's Hospital
- Zhengzhou 450003
- P. R. China
- Henan Key Laboratory of Rare Earth Functional Materials
- Zhoukou Normal University
| | - Cheng Li
- Singapore Centre for Environmental Life Sciences Engineering
- Interdisciplinary Graduate School
- Nanyang Technological University
- Singapore 637551
- Singapore
| | - Shreyas Kuddannayai
- School of Mechanical & Aerospace Engineering
- Nanyang Technological University
- Singapore 639798
- Singapore
| | - Yilei Zhang
- School of Mechanical & Aerospace Engineering
- Nanyang Technological University
- Singapore 639798
- Singapore
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79
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Nagarajan S, Pochat-Bohatier C, Balme S, Miele P, Kalkura SN, Bechelany M. Electrospun fibers in regenerative tissue engineering and drug delivery. PURE APPL CHEM 2017. [DOI: 10.1515/pac-2017-0511] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
AbstractElectrospinning is a versatile technique to produce micron or nano sized fibers using synthetic or bio polymers. The unique structural characteristic of the electrospun mats (ESM) which mimics extracellular matrix (ECM) found influential in regenerative tissue engineering application. ESM with different morphologies or ESM functionalizing with specific growth factors creates a favorable microenvironment for the stem cell attachment, proliferation and differentiation. Fiber size, alignment and mechanical properties affect also the cell adhesion and gene expression. Hence, the effect of ESM physical properties on stem cell differentiation for neural, bone, cartilage, ocular and heart tissue regeneration will be reviewed and summarized. Electrospun fibers having high surface area to volume ratio present several advantages for drug/biomolecule delivery. Indeed, controlling the release of drugs/biomolecules is essential for sustained delivery application. Various possibilities to control the release of hydrophilic or hydrophobic drug from the ESM and different electrospinning methods such as emulsion electrospinning and coaxial electrospinning for drug/biomolecule loading are summarized in this review.
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Affiliation(s)
- Sakthivel Nagarajan
- Institut Européen des Membranes, UMR 5635, Université Montpellier, CNRS, ENSCM, Place Eugene Bataillon, F-34095 Montpellier Cedex 5, France
- Crystal Growth Centre, Anna University, 600025 Chennai, India
| | - Céline Pochat-Bohatier
- Institut Européen des Membranes, UMR 5635, Université Montpellier, CNRS, ENSCM, Place Eugene Bataillon, F-34095 Montpellier Cedex 5, France
| | - Sébastien Balme
- Institut Européen des Membranes, UMR 5635, Université Montpellier, CNRS, ENSCM, Place Eugene Bataillon, F-34095 Montpellier Cedex 5, France
| | - Philippe Miele
- Institut Européen des Membranes, UMR 5635, Université Montpellier, CNRS, ENSCM, Place Eugene Bataillon, F-34095 Montpellier Cedex 5, France
| | | | - Mikhael Bechelany
- Institut Européen des Membranes, UMR 5635, Université Montpellier, CNRS, ENSCM, Place Eugene Bataillon, F-34095 Montpellier Cedex 5, France, Phone: +33467149167, Fax: +33467149119
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80
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Pires LR, Lopes CDF, Salvador D, Rocha DN, Pêgo AP. Ibuprofen-loaded fibrous patches-taming inhibition at the spinal cord injury site. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2017; 28:157. [PMID: 28894995 DOI: 10.1007/s10856-017-5967-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 08/19/2017] [Indexed: 06/07/2023]
Abstract
It is now widely accepted that a therapeutic strategy for spinal cord injury (SCI) demands a multi-target approach. Here we propose the use of an easily implantable bilayer polymeric patch based on poly(trimethylene carbonate-co-ε-caprolactone) (P(TMC-CL)) that combines physical guidance cues provided by electrospun aligned fibres and the delivery of ibuprofen, as a mean to reduce the inhibitory environment at the lesion site by taming RhoA activation. Bilayer patches comprised a solvent cast film onto which electrospun aligned fibres have been deposited. Both layers were loaded with ibuprofen. In vitro release (37°C, in phosphate buffered saline) of the drug from the loaded scaffolds under sink condition was found to occur in the first 24 h. The released ibuprofen was shown to retain its bioactivity, as indicated by the reduction of RhoA activation when the neuronal-like cell line ND7/23 was challenged with lysophosphatidic acid. Ibuprofen-loaded P(TMC-CL) bilayer scaffolds were successfully implanted in vivo in a dorsal hemisection rat SCI model mediating the reduction of RhoA activation after 5 days of implantation in comparison to plain P(TMC-CL) scaffolds. Immunohistochemical analysis of the tissue shows βIII tubulin positive cells close to the ibuprofen-loaded patches further supporting the use of this strategy in the context of regeneration after a lesion in the spinal cord.
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Affiliation(s)
- Liliana R Pires
- INEB - Instituto de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen 208, Porto, 4200-135, Portugal
- INL- International Iberian Nanotechnology Laboratory, Braga, Portugal
| | - Cátia D F Lopes
- INEB - Instituto de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen 208, Porto, 4200-135, Portugal
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal
| | - Daniela Salvador
- INEB - Instituto de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen 208, Porto, 4200-135, Portugal
| | - Daniela N Rocha
- INEB - Instituto de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen 208, Porto, 4200-135, Portugal
| | - Ana Paula Pêgo
- INEB - Instituto de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen 208, Porto, 4200-135, Portugal.
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal.
- Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto (ICBAS), Porto, Portugal.
- Faculdade de Engenharia da Universidade do Porto (FEUP), Porto, Portugal.
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81
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Ayala-Caminero R, Pinzón-Herrera L, Martinez CAR, Almodovar J. Polymeric scaffolds for three-dimensional culture of nerve cells: a model of peripheral nerve regeneration. MRS COMMUNICATIONS 2017; 7:391-415. [PMID: 29515936 PMCID: PMC5836791 DOI: 10.1557/mrc.2017.90] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 08/28/2017] [Indexed: 05/09/2023]
Abstract
Understanding peripheral nerve repair requires the evaluation of 3D structures that serve as platforms for 3D cell culture. Multiple platforms for 3D cell culture have been developed, mimicking peripheral nerve growth and function, in order to study tissue repair or diseases. To recreate an appropriate 3D environment for peripheral nerve cells, key factors are to be considered including: selection of cells, polymeric biomaterials to be used, and fabrication techniques to shape and form the 3D scaffolds for cellular culture. This review focuses on polymeric 3D platforms used for the development of 3D peripheral nerve cell cultures.
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Affiliation(s)
- Radamés Ayala-Caminero
- Bioengineering Program, University of Puerto Rico Mayaguez, Call Box 9000, Mayagüez, Puerto Rico, 00681-9000, USA
| | - Luis Pinzón-Herrera
- Department of Chemical Engineering, University of Puerto Rico Mayagüez, Call Box 9000, Mayaguez, Puerto Rico, 00681-9000, USA
| | - Carol A Rivera Martinez
- Bioengineering Program, University of Puerto Rico Mayaguez, Call Box 9000, Mayagüez, Puerto Rico, 00681-9000, USA
| | - Jorge Almodovar
- Bioengineering Program, University of Puerto Rico Mayaguez, Call Box 9000, Mayagüez, Puerto Rico, 00681-9000, USA
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82
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Omidinia-Anarkoli A, Boesveld S, Tuvshindorj U, Rose JC, Haraszti T, De Laporte L. An Injectable Hybrid Hydrogel with Oriented Short Fibers Induces Unidirectional Growth of Functional Nerve Cells. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1702207. [PMID: 28783255 DOI: 10.1002/smll.201702207] [Citation(s) in RCA: 113] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Indexed: 06/07/2023]
Abstract
To regenerate soft aligned tissues in living organisms, low invasive biomaterials are required to create 3D microenvironments with a structural complexity to mimic the tissue's native architecture. Here, a tunable injectable hydrogel is reported, which allows precise engineering of the construct's anisotropy in situ. This material is defined as an Anisogel, representing a new type of tissue regenerative therapy. The Anisogel comprises a soft hydrogel, surrounding magneto-responsive, cell adhesive, short fibers, which orient in situ in the direction of a low external magnetic field, before complete gelation of the matrix. The magnetic field can be removed after gelation of the biocompatible gel precursor, which fixes the aligned fibers and preserves the anisotropic structure of the Anisogel. Fibroblasts and nerve cells grow and extend unidirectionally within the Anisogels, in comparison to hydrogels without fibers or with randomly oriented fibers. The neurons inside the Anisogel show spontaneous electrical activity with calcium signals propagating along the anisotropy axis of the material. The reported system is simple and elegant and the short magneto-responsive fibers can be produced with an effective high-throughput method, ideal for a minimal invasive route for aligned tissue therapy.
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Affiliation(s)
| | - Sarah Boesveld
- DWI Leibniz Institute for Interactive Materials, Aachen, 52074, Germany
| | | | - Jonas C Rose
- DWI Leibniz Institute for Interactive Materials, Aachen, 52074, Germany
| | - Tamás Haraszti
- DWI Leibniz Institute for Interactive Materials, Aachen, 52074, Germany
| | - Laura De Laporte
- DWI Leibniz Institute for Interactive Materials, Aachen, 52074, Germany
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83
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Stroke Management: An Emerging Role of Nanotechnology. MICROMACHINES 2017; 8:mi8090262. [PMID: 30400452 PMCID: PMC6190436 DOI: 10.3390/mi8090262] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 08/07/2017] [Accepted: 08/09/2017] [Indexed: 12/21/2022]
Abstract
Stroke is among the leading causes of mortality and morbidity worldwide. Stroke incidences and associated mortality are expected to rise to 23 million and 7.8 million, respectively, by 2030. Further, the aging population, imbalanced lifestyles, and environmental factors continue to shift the rate of stroke incidence, particularly in developing countries. There is an urgent need to develop new therapeutic approaches for treating stroke. Nanotechnology is a growing field, offering an encouraging future prospect for medical research in the management of strokes. The world market for nanotechnology derived products is expected to rise manyfold in the coming decades. Different types of nanomaterials such as perfluorocarbon nanoparticles, iron oxide nanoparticles, gold nanoparticles, polymeric nanoparticles, quantum dots, nanospheres, etc. have been developed for the diagnosis as well as therapy of strokes. Today, nanotechnology has also been integrated with stem cell therapy for treating stroke. However several obstacles remain to be overcome when using such nanomaterials for treating stroke and other neurological diseases.
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84
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Tseng VCH, Chew CH, Huang WT, Wang YK, Chen KS, Chou SY, Chen CC. An Effective Cell Coculture Platform Based on the Electrospun Microtube Array Membrane for Nerve Regeneration. Cells Tissues Organs 2017; 204:179-190. [PMID: 28848167 DOI: 10.1159/000477238] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/04/2017] [Indexed: 01/26/2023] Open
Abstract
Recently, a novel substrate known as an electrospun polylactic acid (PLLA) microtube array membrane (MTAM) was successfully developed as a cell coculture platform. Structurally, this substrate is made up of one-to-one connected, ultrathin, submicron scale fibers that are arranged in an arrayed formation. Its unique structure confers several key advantages which are beneficial in a cell coculture system. In this study, the interaction between rat fetal neural stem cells (NSC) and astrocytes was examined by comparing the outcome of a typical Transwell-based coculture system and that of an electrospun PLLA MTAM-based coculture system. Compared to tissue culture polystyrene (TCP) and Transwell coculture inserts, a superior cell viability of NSC was observed when cultured in lumens of electrospun PLLA MTAM (with supportive immunostaining images). Reverse transcription polymerase chain reaction revealed a strong interaction between astrocytes and NSC through a higher expression of doublecortin and a lower expression of nestin. These data demonstrate that MTAM is clearly a better coculture platform than the traditional Transwell system.
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Affiliation(s)
- V Chia-Hsuan Tseng
- Graduate Institute of Biomedical Materials and Tissue Engineering, Taipei Medical University, Taipei, Taiwan, ROC
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85
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Xue J, Xie J, Liu W, Xia Y. Electrospun Nanofibers: New Concepts, Materials, and Applications. Acc Chem Res 2017; 50:1976-1987. [PMID: 28777535 DOI: 10.1021/acs.accounts.7b00218] [Citation(s) in RCA: 453] [Impact Index Per Article: 64.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Electrospinning is a simple and versatile technique that relies on the electrostatic repulsion between surface charges to continuously draw nanofibers from a viscoelastic fluid. It has been applied to successfully produce nanofibers, with diameters down to tens of nanometers, from a rich variety of materials, including polymers, ceramics, small molecules, and their combinations. In addition to solid nanofibers with a smooth surface, electrospinning has also been adapted to generate nanofibers with a number of secondary structures, including those characterized by a porous, hollow, or core-sheath structure. The surface and/or interior of such nanofibers can be further functionalized with molecular species or nanoparticles during or after an electrospinning process. In addition, electrospun nanofibers can be assembled into ordered arrays or hierarchical structures by manipulation of their alignment, stacking, and/or folding. All of these attributes make electrospun nanofibers well-suited for a broad spectrum of applications, including those related to air filtration, water purification, heterogeneous catalysis, environmental protection, smart textiles, surface coating, energy harvesting/conversion/storage, encapsulation of bioactive species, drug delivery, tissue engineering, and regenerative medicine. Over the past 15 years, our group has extensively explored the use of electrospun nanofibers for a range of applications. Here we mainly focus on two examples: (i) use of ceramic nanofibers as catalytic supports for noble-metal nanoparticles and (ii) exploration of polymeric nanofibers as scaffolding materials for tissue regeneration. Because of their high porosity, high surface area to volume ratio, well-controlled composition, and good thermal stability, nonwoven membranes made of ceramic nanofibers are terrific supports for catalysts based on noble-metal nanoparticles. We have investigated the use of ceramic nanofibers made of various oxides, including SiO2, TiO2, SnO2, CeO2, and ZrO2, as supports for heterogeneous catalysts based on noble metals such as Au, Pt, Pd, and Rh. On the other hand, the diameter, composition, alignment, porosity, and surface properties of polymeric nanofibers can be engineered in a controllable fashion to mimic the hierarchical architecture of an extracellular matrix and help manipulate cell behaviors for tissue engineering and regenerative medicine. To this end, we can mimic the native structure and morphology of the extracellular matrix in tendon using uniaxially aligned nanofibers; we can use radially aligned nanofibers to direct the migration of cells from the periphery to the center in an effort to speed up wound healing; and we can also use uniaxially aligned nanofibers to guide and expedite the extension of neurites for peripheral nerve repair. Furthermore, we can replicate the anatomic structures at the tendon-to-bone insertion using nanofiber scaffolds with graded mineral coatings. In this Account, we aim to demonstrate the unique capabilities of electrospun nanofibers as porous supports for heterogeneous catalysis and as functional scaffolds for tissue regeneration by concentrating on some of the recent results.
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Affiliation(s)
- Jiajia Xue
- The
Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States
| | - Jingwei Xie
- Department
of Surgery-Transplant, Mary and Dick Holland Regenerative Medicine
Program, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - Wenying Liu
- School
of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Younan Xia
- The
Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States
- School
of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
- School
of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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86
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Leigh BL, Cheng E, Linjing X, Andresen C, Hansen MR, Guymon CA. Photopolymerizable Zwitterionic Polymer Patterns Control Cell Adhesion and Guide Neural Growth. Biomacromolecules 2017; 18:2389-2401. [PMID: 28671816 PMCID: PMC6372952 DOI: 10.1021/acs.biomac.7b00579] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Developing materials that reduce or eliminate fibrosis encapsulation of neural prosthetic implants could significantly enhance implant fidelity by improving the tissue/electrode array interface. Here, we report on the photografting and patterning of two zwitterionic materials, sulfobetaine methacrylate (SBMA) and carboxybetaine methacrylate (CBMA), for controlling the adhesion and directionality of cells relevant to neural prosthetics. CBMA and SBMA polymers were photopolymerized and grafted on glass surfaces then characterized by X-ray photoelectron spectroscopy, water contact angle, and protein adsorption. Micropatterned surfaces were fabricated with alternating zwitterionic and uncoated bands. Fibroblasts, cells prevalent in fibrotic tissue, almost exclusively migrate and grow on uncoated bands with little to no cells present on zwitterionic bands, especially for CBMA-coated surfaces. Astrocytes and Schwann cells showed similarly low levels of cell adhesion and morphology changes when cultured on zwitterionic surfaces. Additionally, Schwann cells and inner ear spiral ganglion neuron neurites aligned well to zwitterionic patterns.
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Affiliation(s)
- Braden L. Leigh
- Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, IA 52242, USA
| | - Elise Cheng
- Department of Otolaryngology Head and Neck Surgery, University of Iowa, Iowa City, IA 52242, USA
| | - Xu Linjing
- Department of Otolaryngology Head and Neck Surgery, University of Iowa, Iowa City, IA 52242, USA
| | - Corinne Andresen
- Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, IA 52242, USA
| | - Marlan R. Hansen
- Department of Otolaryngology Head and Neck Surgery, University of Iowa, Iowa City, IA 52242, USA
- Department of Neurosurgery, University of Iowa, Iowa City, IA 52242, USA
| | - C. Allan Guymon
- Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, IA 52242, USA
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87
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Kim D, Kim SM, Lee S, Yoon MH. Investigation of neuronal pathfinding and construction of artificial neuronal networks on 3D-arranged porous fibrillar scaffolds with controlled geometry. Sci Rep 2017; 7:7716. [PMID: 28798490 PMCID: PMC5552865 DOI: 10.1038/s41598-017-08231-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Accepted: 07/06/2017] [Indexed: 12/24/2022] Open
Abstract
Herein, we investigated the neurite pathfinding on electrospun microfibers with various fiber densities, diameters, and microbead islands, and demonstrated the development of 3D connected artificial neuronal network within a nanofiber-microbead-based porous scaffold. The primary culture of rat hippocampal embryonic neurons was deposited on geometry-controlled polystyrene (PS) fiber scaffolds while growth cone morphology, neurite outgrowth patterns, and focal adhesion protein expression were cautiously examined by microscopic imaging of immunostained and live neuronal cells derived from actin-GFP transgenic mice. It was demonstrated that the neurite outgrowth was guided by the overall microfiber orientation, but the increase in fiber density induced the neurite path alteration, thus, the reduction in neurite linearity. Indeed, we experimentally confirmed that growth cone could migrate to a neighboring, but, spatially disconnected microfiber by spontaneous filopodium extrusion, which is possibly responsible for the observed neurite steering. Furthermore, thinner microfiber scaffolds showed more pronounced expression of focal adhesion proteins than thicker ones, suggesting that the neuron-microfiber interaction can be delicately modulated by the underlying microfiber geometry. Finally, 3D connected functional neuronal networks were successfully constructed using PS nanofiber-microbead scaffolds where enhanced porosity and vertical fiber orientation permitted cell body inclusion within the scaffold and substantial neurite outgrowth in a vertical direction, respectively.
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Affiliation(s)
- Dongyoon Kim
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju, 61005, Republic of Korea
| | - Seong-Min Kim
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju, 61005, Republic of Korea
| | - Seyeong Lee
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju, 61005, Republic of Korea
- Korea Institute of Energy Research (KIER), 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea
| | - Myung-Han Yoon
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju, 61005, Republic of Korea.
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88
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Marcus M, Baranes K, Park M, Choi IS, Kang K, Shefi O. Interactions of Neurons with Physical Environments. Adv Healthc Mater 2017. [PMID: 28640544 DOI: 10.1002/adhm.201700267] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Nerve growth strongly relies on multiple chemical and physical signals throughout development and regeneration. Currently, a cure for injured neuronal tissue is an unmet need. Recent advances in fabrication technologies and materials led to the development of synthetic interfaces for neurons. Such engineered platforms that come in 2D and 3D forms can mimic the native extracellular environment and create a deeper understanding of neuronal growth mechanisms, and ultimately advance the development of potential therapies for neuronal regeneration. This progress report aims to present a comprehensive discussion of this field, focusing on physical feature design and fabrication with additional information about considerations of chemical modifications. We review studies of platforms generated with a range of topographies, from micro-scale features down to topographical elements at the nanoscale that demonstrate effective interactions with neuronal cells. Fabrication methods are discussed as well as their biological outcomes. This report highlights the interplay between neuronal systems and the important roles played by topography on neuronal differentiation, outgrowth, and development. The influence of substrate structures on different neuronal cells and parameters including cell fate, outgrowth, intracellular remodeling, gene expression and activity is discussed. Matching these effects to specific needs may lead to the emergence of clinical solutions for patients suffering from neuronal injuries or brain-machine interface (BMI) applications.
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Affiliation(s)
- Michal Marcus
- Faculty of Engineering and Bar-Ilan Institute for Nanotechnology and Advanced Materials; Bar-Ilan University; Ramat-Gan 5290002 Israel
| | - Koby Baranes
- Faculty of Engineering and Bar-Ilan Institute for Nanotechnology and Advanced Materials; Bar-Ilan University; Ramat-Gan 5290002 Israel
| | - Matthew Park
- Center for Cell-Encapsulation Research; Department of Chemistry; KAIST; Daejeon 34141 Korea
| | - Insung S. Choi
- Center for Cell-Encapsulation Research; Department of Chemistry; KAIST; Daejeon 34141 Korea
| | - Kyungtae Kang
- Department of Applied Chemistry; Kyung Hee University; Yongin Gyeonggi 17104 Korea
| | - Orit Shefi
- Faculty of Engineering and Bar-Ilan Institute for Nanotechnology and Advanced Materials; Bar-Ilan University; Ramat-Gan 5290002 Israel
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89
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Hackelberg S, Tuck SJ, He L, Rastogi A, White C, Liu L, Prieskorn DM, Miller RJ, Chan C, Loomis BR, Corey JM, Miller JM, Duncan RK. Nanofibrous scaffolds for the guidance of stem cell-derived neurons for auditory nerve regeneration. PLoS One 2017; 12:e0180427. [PMID: 28672008 PMCID: PMC5495534 DOI: 10.1371/journal.pone.0180427] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Accepted: 06/15/2017] [Indexed: 01/13/2023] Open
Abstract
Impairment of spiral ganglion neurons (SGNs) of the auditory nerve is a major cause for hearing loss occurring independently or in addition to sensory hair cell damage. Unfortunately, mammalian SGNs lack the potential for autonomous regeneration. Stem cell based therapy is a promising approach for auditory nerve regeneration, but proper integration of exogenous cells into the auditory circuit remains a fundamental challenge. Here, we present novel nanofibrous scaffolds designed to guide the integration of human stem cell-derived neurons in the internal auditory meatus (IAM), the foramen allowing passage of the spiral ganglion to the auditory brainstem. Human embryonic stem cells (hESC) were differentiated into neural precursor cells (NPCs) and seeded onto aligned nanofiber mats. The NPCs terminally differentiated into glutamatergic neurons with high efficiency, and neurite projections aligned with nanofibers in vitro. Scaffolds were assembled by seeding GFP-labeled NPCs on nanofibers integrated in a polymer sheath. Biocompatibility and functionality of the NPC-seeded scaffolds were evaluated in vivo in deafened guinea pigs (Cavia porcellus). To this end, we established an ouabain-based deafening procedure that depleted an average 72% of SGNs from apex to base of the cochleae and caused profound hearing loss. Further, we developed a surgical procedure to implant seeded scaffolds directly into the guinea pig IAM. No evidence of an inflammatory response was observed, but post-surgery tissue repair appeared to be facilitated by infiltrating Schwann cells. While NPC survival was found to be poor, both subjects implanted with NPC-seeded and cell-free control scaffolds showed partial recovery of electrically-evoked auditory brainstem thresholds. Thus, while future studies must address cell survival, nanofibrous scaffolds pose a promising strategy for auditory nerve regeneration.
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Affiliation(s)
- Sandra Hackelberg
- Kresge Hearing Research Institute, Department of Otolaryngology-Head & Neck Surgery, University of Michigan, Ann Arbor, MI, United States of America
| | - Samuel J. Tuck
- Geriatrics Research, Education, and Clinical Center (GRECC), VA Ann Arbor Healthcare Center (VAAAHC), Ann Arbor, MI, United States of America
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, United States of America
| | - Long He
- Kresge Hearing Research Institute, Department of Otolaryngology-Head & Neck Surgery, University of Michigan, Ann Arbor, MI, United States of America
- Departments of Otorhinolaryngology, Guangzhou First Peoples' Hospital and First Affiliated Hospital, School of Medicine, Jinan University, Guangdong, China
| | - Arjun Rastogi
- Geriatrics Research, Education, and Clinical Center (GRECC), VA Ann Arbor Healthcare Center (VAAAHC), Ann Arbor, MI, United States of America
| | - Christina White
- Geriatrics Research, Education, and Clinical Center (GRECC), VA Ann Arbor Healthcare Center (VAAAHC), Ann Arbor, MI, United States of America
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, United States of America
| | - Liqian Liu
- Kresge Hearing Research Institute, Department of Otolaryngology-Head & Neck Surgery, University of Michigan, Ann Arbor, MI, United States of America
| | - Diane M. Prieskorn
- Kresge Hearing Research Institute, Department of Otolaryngology-Head & Neck Surgery, University of Michigan, Ann Arbor, MI, United States of America
| | - Ryan J. Miller
- Kresge Hearing Research Institute, Department of Otolaryngology-Head & Neck Surgery, University of Michigan, Ann Arbor, MI, United States of America
- Geriatrics Research, Education, and Clinical Center (GRECC), VA Ann Arbor Healthcare Center (VAAAHC), Ann Arbor, MI, United States of America
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, United States of America
| | - Che Chan
- Geriatrics Research, Education, and Clinical Center (GRECC), VA Ann Arbor Healthcare Center (VAAAHC), Ann Arbor, MI, United States of America
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, United States of America
| | - Benjamin R. Loomis
- Kresge Hearing Research Institute, Department of Otolaryngology-Head & Neck Surgery, University of Michigan, Ann Arbor, MI, United States of America
| | - Joseph M. Corey
- Geriatrics Research, Education, and Clinical Center (GRECC), VA Ann Arbor Healthcare Center (VAAAHC), Ann Arbor, MI, United States of America
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, United States of America
- Department of Neurology, University of Michigan, Ann Arbor, MI, United States of America
| | - Josef M. Miller
- Kresge Hearing Research Institute, Department of Otolaryngology-Head & Neck Surgery, University of Michigan, Ann Arbor, MI, United States of America
| | - R. Keith Duncan
- Kresge Hearing Research Institute, Department of Otolaryngology-Head & Neck Surgery, University of Michigan, Ann Arbor, MI, United States of America
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90
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Liu J, Lin DY, Wei B, Martin DC. Single Electrospun PLLA and PCL Polymer Nanofibers: Increased Molecular Orientation with Decreased Fiber Diameter. POLYMER 2017; 118:143-149. [PMID: 29062160 PMCID: PMC5650197 DOI: 10.1016/j.polymer.2017.04.070] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Electrospinning has become a widely-used method for fabricating polymer nanofibers for various applications including filtration, drug delivery, and tissue engineering. Due to the high extensional forces during the electrospinning process, and the rapid crystallization and solidification during solvent evaporation, molecular orientation may develop within the resulting fibers. The properties of electrospun fibers are expected to be sensitive to level of orientation in the fibers. Various reports have shown an increased modulus with decreased fiber diameter, and molecular orientation has been used to explain this trend. However, there have been relatively few studies of the detailed relationship between fiber diameter and molecular orientation, especially at the single fiber level. Here we report a quantitative study of the orientation in individual electrospun poly(caprolactone) (PCL) and poly(L-lactic acid) (PLLA) fibers using low-dose electron microscopy and diffraction techniques. Our results confirmed that for electrospun fibers of PCL and PLLA processed under similar experimental conditions, the molecular orientation decreased as the fiber diameter increased. The extent of orientation remained high for quite large fiber diameters, with azimuthal orientation of 20 degrees seen up to ~500 nm for PCL and ~2000 nm for PLLA.
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Affiliation(s)
- Jinglin Liu
- Department of Materials Science and Engineering, The University of Delaware, Newark, DE, 19716
| | | | - Bin Wei
- Department of Materials Science and Engineering, The University of Delaware, Newark, DE, 19716
| | - David C. Martin
- Department of Materials Science and Engineering, The University of Delaware, Newark, DE, 19716
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91
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Ziemba AM, Gilbert RJ. Biomaterials for Local, Controlled Drug Delivery to the Injured Spinal Cord. Front Pharmacol 2017; 8:245. [PMID: 28539887 PMCID: PMC5423911 DOI: 10.3389/fphar.2017.00245] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 04/19/2017] [Indexed: 11/13/2022] Open
Abstract
Affecting approximately 17,000 new people each year, spinal cord injury (SCI) is a devastating injury that leads to permanent paraplegia or tetraplegia. Current pharmacological approaches are limited in their ability to ameliorate this injury pathophysiology, as many are not delivered locally, for a sustained duration, or at the correct injury time point. With this review, we aim to communicate the importance of combinatorial biomaterial and pharmacological approaches that target certain aspects of the dynamically changing pathophysiology of SCI. After reviewing the pathophysiology timeline, we present experimental biomaterial approaches to provide local sustained doses of drug. In this review, we present studies using a variety of biomaterials, including hydrogels, particles, and fibers/conduits for drug delivery. Subsequently, we discuss how each may be manipulated to optimize drug release during a specific time frame following SCI. Developing polymer biomaterials that can effectively release drug to target specific aspects of SCI pathophysiology will result in more efficacious approaches leading to better regeneration and recovery following SCI.
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Affiliation(s)
| | - Ryan J. Gilbert
- Department of Biomedical Engineering and Center for Biotechnology and Interdisciplinary Sciences, Rensselaer Polytechnic Institute, TroyNY, USA
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92
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Jakobsson A, Ottosson M, Zalis MC, O'Carroll D, Johansson UE, Johansson F. Three-dimensional functional human neuronal networks in uncompressed low-density electrospun fiber scaffolds. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2017; 13:1563-1573. [DOI: 10.1016/j.nano.2016.12.023] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Revised: 11/04/2016] [Accepted: 12/30/2016] [Indexed: 11/25/2022]
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93
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Tonazzini I, Moffa M, Pisignano D, Cecchini M. Neuregulin 1 functionalization of organic fibers for Schwann cell guidance. NANOTECHNOLOGY 2017; 28:155303. [PMID: 28303795 DOI: 10.1088/1361-6528/aa6316] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The repair of peripheral nerve lesions is a clinical problem where the functional recovery is often far from being satisfactory, although peripheral nerves generally retain good potential for regeneration. Here, we develop a novel scaffold approach based on bioactive fibers of poly(ε-caprolactone) where nanotopographical guidance and neuregulin 1 (NRG1) cues are combined. We interface them with rat primary Schwann cells (SCs), the peripheral glial cells that drive initial regeneration of injured nerves, and found that the combination of NRG1 with parallel nano-fibrous topographies is effective in improving SC growth up to 72 h, alignment to fiber topography, and bipolar differentiation, opening original perspectives for nerve repair applications.
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Affiliation(s)
- Ilaria Tonazzini
- NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, Pisa I-56127, Italy. Fondazione Umberto Veronesi, Piazza Velasca 5, Milan I-20122, Italy
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94
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Merolli A, Mao Y, Kohn J. A suspended carbon fiber culture to model myelination by human Schwann cells. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2017; 28:57. [PMID: 28210970 DOI: 10.1007/s10856-017-5867-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2016] [Accepted: 02/07/2017] [Indexed: 06/06/2023]
Abstract
Understanding of myelination/remyelination process is essential to guide tissue engineering for nerve regeneration. In vitro models currently used are limited to cell population studies and cannot easily identify individual cell contribution to the process. We established a novel model to study the contribution of human Schwann cells to the myelination process. The model avoids the presence of neurons in culture; Schwann cells respond solely to the biophysical properties of an artificial axon. The model uses a single carbon fiber suspended in culture media far from the floor of the well. The fiber provides an elongated structure of defined diameter with 360-degree of surface available for human Schwann cells to wrap around. This model enabled us to spatially and temporally track the myelination by individual Schwann cells along the fiber. We observed cell attachment, elongation and wrapping over a period of 9 days. Cells remained alive and expressed Myelin Basic Protein and Myelin Associated Glycoprotein as expected. Natural and artificial molecules, and external physical factors (e.g., p atterned electrical impulses), may be tested with this model as possible regulators of myelination.
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Affiliation(s)
- Antonio Merolli
- New Jersey Center for Biomaterials, Rutgers-The State University of New Jersey, 145 Bevier Rd., Piscataway, NJ, 08854, USA.
- Policlinico Gemelli, Universita' Cattolica del Sacro Cuore, largo Gemelli 8, 00168, Rome, Italy.
| | - Yong Mao
- New Jersey Center for Biomaterials, Rutgers-The State University of New Jersey, 145 Bevier Rd., Piscataway, NJ, 08854, USA
| | - Joachim Kohn
- New Jersey Center for Biomaterials, Rutgers-The State University of New Jersey, 145 Bevier Rd., Piscataway, NJ, 08854, USA
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95
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Simitzi C, Ranella A, Stratakis E. Controlling the morphology and outgrowth of nerve and neuroglial cells: The effect of surface topography. Acta Biomater 2017; 51:21-52. [PMID: 28069509 DOI: 10.1016/j.actbio.2017.01.023] [Citation(s) in RCA: 133] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 12/23/2016] [Accepted: 01/05/2017] [Indexed: 02/07/2023]
Abstract
Unlike other tissue types, like epithelial tissue, which consist of cells with a much more homogeneous structure and function, the nervous tissue spans in a complex multilayer environment whose topographical features display a large spectrum of morphologies and size scales. Traditional cell cultures, which are based on two-dimensional cell-adhesive culture dishes or coverslips, are lacking topographical cues and mainly simulate the biochemical microenvironment of the cells. With the emergence of micro- and nano-fabrication techniques new types of cell culture platforms are developed, where the effect of various topographical cues on cellular morphology, proliferation and differentiation can be studied. Different approaches (regarding the material, fabrication technique, topographical characteristics, etc.) have been implemented. The present review paper aims at reviewing the existing body of literature on the use of artificial micro- and nano-topographical features to control neuronal and neuroglial cells' morphology, outgrowth and neural network topology. The cell responses-from phenomenology to investigation of the underlying mechanisms- on the different topographies, including both deterministic and random ones, are summarized. STATEMENT OF SIGNIFICANCE There is increasing evidence that physical cues, such as topography, can have a significant impact on the neural cell functions. With the aid of micro-and nanofabrication techniques, new types of cell culture platforms are developed and the effect of surface topography on the cells has been studied. The present review article aims at reviewing the existing body of literature reporting on the use of various topographies to study and control the morphology and functions of cells from nervous tissue, i.e. the neuronal and the neuroglial cells. The cell responses-from phenomenology to investigation of the underlying mechanisms- on the different topographies, including both deterministic and random ones, are summarized.
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Affiliation(s)
- C Simitzi
- Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), Heraklion 71003, Greece
| | - A Ranella
- Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), Heraklion 71003, Greece
| | - E Stratakis
- Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), Heraklion 71003, Greece.
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96
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Non-covalently crosslinked chitosan nanofibrous mats prepared by electrospinning as substrates for soft tissue regeneration. Carbohydr Polym 2017; 162:82-92. [PMID: 28224898 DOI: 10.1016/j.carbpol.2017.01.050] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 01/11/2017] [Accepted: 01/14/2017] [Indexed: 11/22/2022]
Abstract
Chitosan (CS) membranes obtained by electrospinning are potentially ideal substrates for soft tissue engineering as they combine the excellent biological properties of CS with the extracellular matrix (ECM)-like structure of nanofibrous mats. However, the high amount of acid solvents required to spun CS solutions interferes with the biocompatibility of CS fibres. To overcome this limitation, novel CS based solutions were investigated in this work. Low amount of acidic acid (0.5M) was used and dibasic sodium phosphate (DSP) was introduced as ionic crosslinker to improve nanofibres water stability and to neutralize the acidic pH of electrospun membranes after fibres soaking in biological fluids. Randomly oriented and aligned nanofibres (128±19nm and 140±41nm, respectively) were obtained through electrospinning process (voltage of 30kV, 30μL/min flow rate and temperature of 39°C) showing mechanical properties similar to those of soft tissues (Young Modulus lower than 40MPa in dry condition) and water stability until 7 days. C2C12 myoblast cell line was cultured on CS fibres showing that the aligned architecture of substrate induces cell orientation that can enhance skeletal muscle regeneration.
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97
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Wu T, Li D, Wang Y, Sun B, Li D, Morsi Y, El-Hamshary H, Al-Deyab SS, Mo X. Laminin-coated nerve guidance conduits based on poly(l-lactide-co-glycolide) fibers and yarns for promoting Schwann cells’ proliferation and migration. J Mater Chem B 2017; 5:3186-3194. [DOI: 10.1039/c6tb03330j] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A laminin-coated and yarn-encapsulated PLGA nerve guidance conduit for Schwann cells’ proliferation and migration.
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Affiliation(s)
- Tong Wu
- State Key Lab for Modification of Chemical Fibers and Polymer Materials
- College of Chemistry
- Chemical Engineering and Biotechnology
- Donghua University
- Shanghai 201620
| | - Dandan Li
- College of Material Science and Engineering
- Donghua University
- Shanghai 201620
- China
| | - Yuanfei Wang
- State Key Laboratory of Bioreactor Engineering
- School of Resources and Environmental Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Binbin Sun
- State Key Lab for Modification of Chemical Fibers and Polymer Materials
- College of Chemistry
- Chemical Engineering and Biotechnology
- Donghua University
- Shanghai 201620
| | - Dawei Li
- College of Textiles
- Donghua University
- Shanghai 201620
- China
| | - Yosry Morsi
- Faculty of Engineering and Industrial Sciences
- Swinburne University of Technology
- Hawthorn
- Australia
| | - Hany El-Hamshary
- Department of Chemistry
- College of Science
- King Saud University
- Riyadh 11451
- Kingdom of Saudi Arabia
| | - Salem S. Al-Deyab
- Department of Chemistry
- College of Science
- King Saud University
- Riyadh 11451
- Kingdom of Saudi Arabia
| | - Xiumei Mo
- State Key Lab for Modification of Chemical Fibers and Polymer Materials
- College of Chemistry
- Chemical Engineering and Biotechnology
- Donghua University
- Shanghai 201620
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98
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Vigani B, Rossi S, Sandri G, Bonferoni MC, Ferrari F. Design and criteria of electrospun fibrous scaffolds for the treatment of spinal cord injury. Neural Regen Res 2017; 12:1786-1790. [PMID: 29239316 PMCID: PMC5745824 DOI: 10.4103/1673-5374.219029] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
The complex pathophysiology of spinal cord injury may explain the current lack of an effective therapeutic approach for the regeneration of damaged neuronal cells and the recovery of motor functions. Many efforts have been performed to design and develop suitable scaffolds for spinal cord regeneration, keeping in mind that the reconstruction of a pro-regenerative environment is the key challenge for an effective neurogenesis. The aim of this review is to outline the main features of an ideal scaffold, based on biomaterials, produced by the electrospinning technique and intended for the spinal cord regeneration. An overview of the polymers more investigated in the production of neural fibrous scaffolds is also provided.
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Affiliation(s)
- Barbara Vigani
- Department of Drug Sciences, University of Pavia, Viale Taramelli, Pavia, Italy
| | - Silvia Rossi
- Department of Drug Sciences, University of Pavia, Viale Taramelli, Pavia, Italy
| | - Giuseppina Sandri
- Department of Drug Sciences, University of Pavia, Viale Taramelli, Pavia, Italy
| | | | - Franca Ferrari
- Department of Drug Sciences, University of Pavia, Viale Taramelli, Pavia, Italy
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99
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Cui L, Li J, Long Y, Hu M, Li J, Lei Z, Wang H, Huang R, Li X. Vascularization of LBL structured nanofibrous matrices with endothelial cells for tissue regeneration. RSC Adv 2017. [DOI: 10.1039/c6ra26931a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The aligned LBL scaffold promoted host vessel infiltration into the scaffolds and integration with in vitro prefabricated vascular structures.
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Affiliation(s)
- Lei Cui
- Department of Plastic Surgery
- Tangdu Hospital
- Fourth Military Medical University
- Xi'an 710038
- China
| | - Jing Li
- Department of Plastic Surgery
- Tangdu Hospital
- Fourth Military Medical University
- Xi'an 710038
- China
| | - Yunze Long
- College of Physics
- Qingdao University
- Qingdao 266071
- China
| | - Min Hu
- Department of Applied Chemistry
- School of Science
- Xi'an Jiaotong University
- Xi'an 710049
- China
| | - Jinqing Li
- Department of Plastic Surgery
- Tangdu Hospital
- Fourth Military Medical University
- Xi'an 710038
- China
| | - Zhanjun Lei
- Department of Plastic Surgery
- Tangdu Hospital
- Fourth Military Medical University
- Xi'an 710038
- China
| | - Hongjun Wang
- Department of Chemistry, Chemical Biology and Biomedical Engineering
- Stevens Institute of Technology
- Hoboken
- USA
| | - Rong Huang
- Department of Plastic Surgery
- Tangdu Hospital
- Fourth Military Medical University
- Xi'an 710038
- China
| | - Xueyong Li
- Department of Plastic Surgery
- Tangdu Hospital
- Fourth Military Medical University
- Xi'an 710038
- China
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100
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Repić T, Madirazza K, Bektur E, Sapunar D. Characterization of dorsal root ganglion neurons cultured on silicon micro-pillar substrates. Sci Rep 2016; 6:39560. [PMID: 28008963 PMCID: PMC5180168 DOI: 10.1038/srep39560] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 11/23/2016] [Indexed: 01/08/2023] Open
Abstract
Our study focuses on characterization of dorsal root ganglion (DRG) neurons cultured on silicon micro-pillar substrates (MPS) with the ultimate goal of designing micro-electrode arrays (MEAs) for successful electrophysiological recordings of DRG neurons. Adult and neonatal DRG neurons were cultured on MPS and glass coverslips for 7 days in vitro. DRG neuronal distribution and morphometric analysis, including neurite alignment and length, was performed on MPS areas with different pillar width and spacing. We showed that MPS provide an environment for growth of adult and neonatal DRG neurons as permissive as control glass surfaces. Neonatal DRG neurons were present on MPS areas with narrow pillar spacing, while adult neurons preferred wider pillar spacing. Compared to the control glass surfaces the neonatal and adult DRG neurons in regions with narrow pillar spacing range developed a smaller number of longer neurites. In the same area, neurites were preferentially oriented along three directional axes at 30°, 90° and 150°. MPS architecture influenced growth directionality of all main DRG neuronal subtypes. We can conclude that specific micro-pillar substrate topography affects the morphology of DRG neurons. This knowledge can enable development of MEAs with precisely defined physical features for various neuroscience applications.
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Affiliation(s)
- Tihana Repić
- Laboratory for Pain Research, School of Medicine, University of Split, Croatia
| | - Katarina Madirazza
- Speech and Hearing Research Laboratory, School of Medicine, University of Split, Croatia
| | - Ezgi Bektur
- Histology and Embryology Department, School of Medicine, Eskisehir Osmangazi University, Turkey
| | - Damir Sapunar
- Laboratory for Pain Research, School of Medicine, University of Split, Croatia
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