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Wille I, Harre J, Oehmichen S, Lindemann M, Menzel H, Ehlert N, Lenarz T, Warnecke A, Behrens P. Development of Neuronal Guidance Fibers for Stimulating Electrodes: Basic Construction and Delivery of a Growth Factor. Front Bioeng Biotechnol 2022; 10:776890. [PMID: 35141211 PMCID: PMC8819688 DOI: 10.3389/fbioe.2022.776890] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 01/05/2022] [Indexed: 12/03/2022] Open
Abstract
State-of-the-art treatment for sensorineural hearing loss is based on electrical stimulation of residual spiral ganglion neurons (SGNs) with cochlear implants (CIs). Due to the anatomical gap between the electrode contacts of the CI and the residual afferent fibers of the SGNs, spatial spreading of the stimulation signal hampers focused neuronal stimulation. Also, the efficiency of a CI is limited because SGNs degenerate over time due to loss of trophic support. A promising option to close the anatomical gap is to install fibers as artificial nerve guidance structures on the surface of the implant and install on these fibers drug delivery systems releasing neuroprotective agents. Here, we describe the first steps in this direction. In the present study, suture yarns made of biodegradable polymers (polyglycolide/poly-ε-caprolactone) serve as the basic fiber material. In addition to the unmodified fiber, also fibers modified with amine groups were employed. Cell culture investigations with NIH 3T3 fibroblasts attested good cytocompatibility to both types of fibers. The fibers were then coated with the extracellular matrix component heparan sulfate (HS) as a biomimetic of the extracellular matrix. HS is known to bind, stabilize, modulate, and sustainably release growth factors. Here, we loaded the HS-carrying fibers with the brain-derived neurotrophic factor (BDNF) which is known to act neuroprotectively. Release of this neurotrophic factor from the fibers was followed over a period of 110 days. Cell culture investigations with spiral ganglion cells, using the supernatants from the release studies, showed that the BDNF delivered from the fibers drastically increased the survival rate of SGNs in vitro. Thus, biodegradable polymer fibers with attached HS and loaded with BDNF are suitable for the protection and support of SGNs. Moreover, they present a promising base material for the further development towards a future neuronal guiding scaffold.
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Affiliation(s)
- Inga Wille
- Institut für Anorganische Chemie, Leibniz Universität Hannover, Hannover, Germany
- Cluster of Excellence Hearing4all, Hannover, Germany
| | - Jennifer Harre
- Cluster of Excellence Hearing4all, Hannover, Germany
- Department of Otorhinolaryngology, Head and Neck Surgery, Hannover Medical School, Hannover, Germany
| | - Sarah Oehmichen
- Institut für Technische Chemie, Technische Universität Braunschweig, Braunschweig, Germany
| | - Maren Lindemann
- Institut für Technische Chemie, Technische Universität Braunschweig, Braunschweig, Germany
| | - Henning Menzel
- Institut für Technische Chemie, Technische Universität Braunschweig, Braunschweig, Germany
| | - Nina Ehlert
- Institut für Anorganische Chemie, Leibniz Universität Hannover, Hannover, Germany
- Cluster of Excellence Hearing4all, Hannover, Germany
| | - Thomas Lenarz
- Cluster of Excellence Hearing4all, Hannover, Germany
- Department of Otorhinolaryngology, Head and Neck Surgery, Hannover Medical School, Hannover, Germany
| | - Athanasia Warnecke
- Cluster of Excellence Hearing4all, Hannover, Germany
- Department of Otorhinolaryngology, Head and Neck Surgery, Hannover Medical School, Hannover, Germany
| | - Peter Behrens
- Institut für Anorganische Chemie, Leibniz Universität Hannover, Hannover, Germany
- Cluster of Excellence Hearing4all, Hannover, Germany
- Cluster of Excellence PhoenixD, Hannover, Germany
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Abstract
Self-cleaning surfaces may have wide applications such as microfluidic devices, lab-on-a-chip, sensors, microreactors, air purification, and antimicrobial fields. In this article, by using a combination of femtosecond (fs) laser irradiation and fluorination technique, self-cleaning stainless steel surfaces with unique antifouling property were obtained. New insight is developed through a detailed analysis of the antifouling behavior of the self-cleaning surfaces. The surface free energy and its polar and disperse components were calculated by using the Owens–Wendt-–Rabel–Kaelble (OWRK) method. X-ray photoelectron spectroscopy was employed to analyse the surface elemental compositions and functional groups. The antifouling property of the surface was recorded by using a high speed camera. Water sliding angles (SAs) were reduced by fluorination treatment, resulting in low adhesive superhydrophobic surfaces with the self-cleaning property. The influences of micro/nanostructures, fluorination, and their combination on the surface free energy were investigated. The interaction process between water droplets and pollutants (inorganic and organic particles) on the treated surface was explored. The antifouling property of an optimized specimen (CA = 162° and SA = 1°) was tested and compared with the untreated sample.
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3
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Jing W, Huang Y, Wei P, Cai Q, Yang X, Zhong W. Roles of electrical stimulation in promoting osteogenic differentiation of BMSCs on conductive fibers. J Biomed Mater Res A 2019; 107:1443-1454. [PMID: 30786145 DOI: 10.1002/jbm.a.36659] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 01/30/2019] [Accepted: 02/15/2019] [Indexed: 01/22/2023]
Abstract
The strategy of using conductive materials in regenerating bone defects is attractive, benefiting from the bioelectricity feature of natural bone tissues. Thereby, POP conductive fibers were fabricated by coating polypyrrole (PPY) onto electrospun poly(l-lactide) (PLLA) fibers, and their potentials in promoting osteogenic differentiation of bone mesenchymal stromal cells (BMSCs) were investigated. Different from the smooth-surfaced PLLA fibers, POP fibers were rough-surfaced and favorable for protein adsorption and mineralization nucleation. When electrical stimulation (ES) was applied, the surface charges on the conductive POP fibers further promoted the protein adsorption and the mineral deposition, while the non-conductive PLLA fibers displayed no such promotion. When BMSCs were cultured on these fibers, strong cell viability was detected, indicating their good biocompatibility and cell affinity. In osteogenic differentiation studies, BMSCs demonstrated the strongest ability in differentiating toward osteoblasts when they were cultured on the POP fibers under ES, followed by the case without ES. In comparison with the conductive POP fibers, the non-conductive PLLA fibers displayed significantly weaker ability in inducing the osteogenic differentiation of BMSCs with ES being applied or not. Alongside the differentiation, both the calcium deposition on BMSC/material complexes and the intracellular Ca2+ concentration were identified the most abundant when BMSCs grew on the POP fibers under ES. These findings suggested that the surface charges of conductive fibers played roles in regulating protein adsorption, ion migration and nucleation, particularly under ES, which contributed much to the increased intracellular Ca2+ ions, and thus accelerated the osteogenic differentiation of the seeded cells. © 2019 Wiley Periodicals, Inc. J Biomed Mater Res Part A, 2019.
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Affiliation(s)
- Wei Jing
- State Key Laboratory of Organic-Inorganic Composites, Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Yiqian Huang
- State Key Laboratory of Organic-Inorganic Composites, Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Pengfei Wei
- State Key Laboratory of Organic-Inorganic Composites, Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Qing Cai
- State Key Laboratory of Organic-Inorganic Composites, Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Xiaoping Yang
- State Key Laboratory of Organic-Inorganic Composites, Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Weihong Zhong
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington, 99164
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4
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Peripheral nerve bionic interface: a review of electrodes. INTERNATIONAL JOURNAL OF INTELLIGENT ROBOTICS AND APPLICATIONS 2019. [DOI: 10.1007/s41315-019-00086-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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5
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Wu Y, Peng Y, Bohra H, Zou J, Ranjan VD, Zhang Y, Zhang Q, Wang M. Photoconductive Micro/Nanoscale Interfaces of a Semiconducting Polymer for Wireless Stimulation of Neuron-Like Cells. ACS APPLIED MATERIALS & INTERFACES 2019; 11:4833-4841. [PMID: 30624894 DOI: 10.1021/acsami.8b19631] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
We report multiscale structured fibers and patterned films based on a semiconducting polymer, poly(3-hexylthiophene) (P3HT), as photoconductive biointerfaces to promote neuronal stimulation upon light irradiation. The micro/nanoscale structures of P3HT used for neuronal interfacing and stimulation include nanofibers with an average diameter of 100 nm, microfibers with an average diameter of about 1 μm, and lithographically patterned stripes with width of 3, 25, and 50 μm, respectively. The photoconductive effect of P3HT upon light irradiation provides electrical stimulation for neuronal differentiation and directed growth. Our results demonstrate that neurons on P3HT nanofibers showed a significantly higher total number of branches, while neurons grown on P3HT microfibers had longer and thinner neurites. Such a combination strategy of topographical and photoconductive stimulation can be applied to further enhance neuronal differentiation and directed growth. These photoconductive polymeric micro/nanostructures demonstrated their great potential for neural engineering and development of novel neural regenerative devices.
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Affiliation(s)
- Yingjie Wu
- School of Chemical and Biomedical Engineering , Nanyang Technological University , 62 Nanyang Drive , Singapore 637459 , Singapore
| | - Yanfen Peng
- School of Chemical and Biomedical Engineering , Nanyang Technological University , 62 Nanyang Drive , Singapore 637459 , Singapore
| | - Hassan Bohra
- School of Chemical and Biomedical Engineering , Nanyang Technological University , 62 Nanyang Drive , Singapore 637459 , Singapore
| | - Jianping Zou
- School of Electrical and Electronic Engineering , Nanyang Technological University , 50 Nanyang Avenue , Singapore 639798 , Singapore
| | - Vivek Damodar Ranjan
- School of Mechanical & Aerospace Engineering , Nanyang Technological University , 50 Nanyang Avenue , Singapore 639798 , Singapore
| | - Yilei Zhang
- School of Mechanical & Aerospace Engineering , Nanyang Technological University , 50 Nanyang Avenue , Singapore 639798 , Singapore
| | - Qing Zhang
- School of Electrical and Electronic Engineering , Nanyang Technological University , 50 Nanyang Avenue , Singapore 639798 , Singapore
| | - Mingfeng Wang
- School of Chemical and Biomedical Engineering , Nanyang Technological University , 62 Nanyang Drive , Singapore 637459 , Singapore
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6
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Jing W, Zuo D, Cai Q, Chen G, Wang L, Yang X, Zhong W. Promoting neural transdifferentiation of BMSCs via applying synergetic multiple factors for nerve regeneration. Exp Cell Res 2019; 375:80-91. [DOI: 10.1016/j.yexcr.2018.12.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 12/22/2018] [Accepted: 12/27/2018] [Indexed: 12/20/2022]
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7
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Jing W, Zhang Y, Cai Q, Chen G, Wang L, Yang X, Zhong W. Study of Electrical Stimulation with Different Electric-Field Intensities in the Regulation of the Differentiation of PC12 Cells. ACS Chem Neurosci 2019; 10:348-357. [PMID: 30212623 DOI: 10.1021/acschemneuro.8b00286] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The strategy of using electrical stimulation (ES) to promote the neural differentiation and regeneration of injured nerves is proven feasible. Study of the possible molecular mechanisms in relation to this ES promotion effect should be helpful for understanding the phenomenon. In this study, it was identified that the neuronal differentiation of PC12 cells was enhanced when the electric field intensity was in the range of 30-80 mV/mm, and a lower or higher electric-field intensity displayed inferior effects. Under ES, however, levels of intracellular reactive oxygen species (ROS), intracellular Ca2+ dynamics, and expression of TREK-1 were measured as being gradually increasing alongside higher electric-field intensity. In trying to understand the relationship between the ES enhancement on differentiation and these variations in cell activities, parallel experiments were conducted by introducing exogeneous H2O2 into culture systems at different concentrations. Similarly, the effects of H2O2 concentration on the neuronal differentiation of PC12 cells, intracellular ROS and Ca2+ levels, and TREK-1 expression were systematically characterized. In comparative studies, it was found in two cases that ES of 50 mV/mm for 2 h/day and H2O2 of 5 μM in culture medium shared comparable results for intracellular ROS and Ca2+ levels and TREK-1 expression. Higher H2O2 concentrations (e.g., 10 and 20 μM) demonstrated adverse effects on cell differentiation and caused DNA damage. A stronger ES (e.g., 100 mV/mm), being associated with a higher intracellular ROS level, also resulted in weaker enhancement of the neuronal differentiation of PC12 cells. These facts suggested that the intracellular ROS generated under ES might be an intermediate signal transducer involved in cascade reactions relative to cell differentiation.
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Affiliation(s)
- Wei Jing
- State Key Laboratory of Organic−Inorganic Composites; Beijing Laboratory of Biomedical Materials; Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Yifan Zhang
- State Key Laboratory of Organic−Inorganic Composites; Beijing Laboratory of Biomedical Materials; Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Qing Cai
- State Key Laboratory of Organic−Inorganic Composites; Beijing Laboratory of Biomedical Materials; Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Guoqiang Chen
- Department of Neurosurgery, Aviation General Hospital of China Medical University, Beijing 100012, PR China
| | - Lin Wang
- Department of Neurosurgery, Aviation General Hospital of China Medical University, Beijing 100012, PR China
| | - Xiaoping Yang
- State Key Laboratory of Organic−Inorganic Composites; Beijing Laboratory of Biomedical Materials; Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Weihong Zhong
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, United States
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Baek J, Cho SY, Kang H, Ahn H, Jung WB, Cho Y, Lee E, Cho SW, Jung HT, Im SG. Distinct Mechanosensing of Human Neural Stem Cells on Extremely Limited Anisotropic Cellular Contact. ACS APPLIED MATERIALS & INTERFACES 2018; 10:33891-33900. [PMID: 30207452 DOI: 10.1021/acsami.8b10171] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Human neural stem cells (hNSCs) can alter their fate choice in response to the biophysical cues provided during development. In particular, it has been reported that the differentiation of neural stem cells (NSCs) is enhanced by anisotropic contact, which facilitates focal adhesion (FA) formation and cytoskeletal organization. However, a biomolecular mechanism governing how the cells process the biophysical cues from these anisotropic geometries to their fate commitment is still poorly understood due to the limited availability of geometrical diversities (contact width above 50 nm) applicable to cell studies. Here, we firstly demonstrate that the biomolecular mechanism for enhanced neurogenesis on an anisotropic nanostructure is critically dependent on the resolution of a contact feature. We observed a totally different cellular response to anisotropic geometries by first utilizing a high-resolution nanogroove (HRN) structure with an extremely narrow contact width (15 nm). The width scale is sufficiently low to suppress the integrin clustering and enable us to elucidate how the contact area influences the neurogenesis of hNSCs at an aligned state. Both the HRN and control nanogroove (CN) pattern with a contact width of 1 μm induced the spontaneous topographic alignment of hNSCs. However, intriguingly, the focal adhesion (FA) formation and cytoskeletal reorganization were substantially limited on the HRN, although the cells on the CN showed enhanced FA formation compared with flat surfaces. In particular, the hNSCs on the HRN surface exhibited a strikingly lower fraction of nuclear yes-associated protein (YAP) than on the CN surface, which was turned out to be regulated by Rho GTPase in the same way as the cells sense the mechanical properties of the environment. Considering the previously reported role of YAP on neurogenesis, our finding newly substantiates that YAP and Rho GTPase also can be transducers of hNSCs to process topographical alternation to fate decision. Furthermore, this study with the unprecedented high-resolution nanostructure suggests a novel geometry sensing model where the functional crosstalk between YAP signaling and Rho GTPase integrally regulate the fate commitment of the hNSCs.
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Affiliation(s)
- Jieung Baek
- Department of Chemical and Biomolecular Engineering , Korea Advanced Institute of Science and Technology , 291 Daehak-ro , Daejeon 34141 , Korea
| | - Soo-Yeon Cho
- Department of Chemical and Biomolecular Engineering , Korea Advanced Institute of Science and Technology , 291 Daehak-ro , Daejeon 34141 , Korea
- KAIST Institute for NanoCentury , 291 Daehak-ro , Daejeon 34141 , Korea
| | - Hohyung Kang
- Department of Chemical and Biomolecular Engineering , Korea Advanced Institute of Science and Technology , 291 Daehak-ro , Daejeon 34141 , Korea
- KAIST Institute for NanoCentury , 291 Daehak-ro , Daejeon 34141 , Korea
| | - Hyunah Ahn
- Department of Chemical and Biomolecular Engineering , Korea Advanced Institute of Science and Technology , 291 Daehak-ro , Daejeon 34141 , Korea
- KAIST Institute for NanoCentury , 291 Daehak-ro , Daejeon 34141 , Korea
| | - Woo-Bin Jung
- Department of Chemical and Biomolecular Engineering , Korea Advanced Institute of Science and Technology , 291 Daehak-ro , Daejeon 34141 , Korea
- KAIST Institute for NanoCentury , 291 Daehak-ro , Daejeon 34141 , Korea
| | - Younghak Cho
- Department of Chemical and Biomolecular Engineering , Korea Advanced Institute of Science and Technology , 291 Daehak-ro , Daejeon 34141 , Korea
| | - Eunjung Lee
- Department of Chemical and Biomolecular Engineering , Korea Advanced Institute of Science and Technology , 291 Daehak-ro , Daejeon 34141 , Korea
| | - Seung-Woo Cho
- Department of Biotechnology , Yonsei University , Seoul 120-749 , Korea
| | - Hee-Tae Jung
- Department of Chemical and Biomolecular Engineering , Korea Advanced Institute of Science and Technology , 291 Daehak-ro , Daejeon 34141 , Korea
- KAIST Institute for NanoCentury , 291 Daehak-ro , Daejeon 34141 , Korea
| | - Sung Gap Im
- Department of Chemical and Biomolecular Engineering , Korea Advanced Institute of Science and Technology , 291 Daehak-ro , Daejeon 34141 , Korea
- KAIST Institute for NanoCentury , 291 Daehak-ro , Daejeon 34141 , Korea
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9
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Morin EA, He W. In vitro
study of central nervous system foreign body response towards hydrogel particle modified planar substrate. J Biomed Mater Res A 2017; 105:3242-3250. [DOI: 10.1002/jbm.a.36180] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 06/30/2017] [Accepted: 08/01/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Emily A. Morin
- Department of Mechanical, Aerospace, and Biomedical EngineeringUniversity of TennesseeKnoxville Tennessee37996
| | - Wei He
- Department of Mechanical, Aerospace, and Biomedical EngineeringUniversity of TennesseeKnoxville Tennessee37996
- Department of Materials Science and EngineeringUniversity of TennesseeKnoxville Tennessee37996
- Department of Polymer Science and EngineeringDalian University of TechnologyDalian Liaoning116023 China
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10
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11
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Sergi PN, Cavalcanti-Adam EA. Biomaterials and computation: a strategic alliance to investigate emergent responses of neural cells. Biomater Sci 2017; 5:648-657. [DOI: 10.1039/c6bm00871b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synergistic use of biomaterials and computation allows to identify and unravel neural cell responses.
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Affiliation(s)
- Pier Nicola Sergi
- The Biorobotics Institute
- Sant’ Anna Scuola Universitaria Superiore
- Pontedera
- 56025 Italy
| | - Elisabetta Ada Cavalcanti-Adam
- Max Planck Institute for Medical Research
- Dept Cellular Biophysics and Heidelberg University
- Dept Biophysical Chemistry
- Heidelberg
- Germany
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12
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Dencker F, Dreyer L, Müller D, Zernetsch H, Paasche G, Sindelar R, Glasmacher B. A silicone fiber coating as approach for the reduction of fibroblast growth on implant electrodes. J Biomed Mater Res B Appl Biomater 2016; 105:2574-2580. [PMID: 27701814 DOI: 10.1002/jbm.b.33798] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Revised: 08/19/2016] [Accepted: 09/12/2016] [Indexed: 11/11/2022]
Abstract
In cochlear implant (CI) patients, an increase in electrode impedance due to fibrotic encapsulation is frequently observed. Several attempts have been proposed to reduce fibroblast growth at the electrode contacts, but none proved to be satisfactory so far. Here, a silicone fiber coating of the electrode contacts is presented that provides a complex micro-scale surface topography and increases hydrophobicity to inhibit fibroblast growth and adhesion. A silicone fiber electrospinning process was developed to create a thin and porous fiber mesh. Fiber coatings were applied on graphite specimen holders, glass cover slips and CI electrode contacts. For characterization of the coating's pore distribution, water contact angle and electrical impedance were analyzed. Cytotoxicity and in vitro fibroblast growth were evaluated to assess biological efficacy of the coatings. It could be shown that the silicone fiber mesh itself had only minor influence on electrode impedance. A uniform, hydrophobic fiber coating could be achieved that decreased fibroblast growth without showing toxic effects. Finally, CI electrode contacts were successfully coated in order to present this promising approach for a long-term improvement of CI electrodes. We are one of the first groups that could successfully adapt the electrospinning technique on the utilization of silicone. Silicone was chosen because of its high hydrophobicity, chemical stability and excellent biocompatibility and as it is one of the biomaterials already used in CIs. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 2574-2580, 2017.
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Affiliation(s)
- Folke Dencker
- Department of Material Science, Faculty II, University of Applied Sciences and Arts Hannover, Germany.,Institute of Micro Production Technology, Leibniz Universität Hannover, Germany
| | - Lutz Dreyer
- Institute for Multiphase Processes, Leibniz Universität Hannover, Germany
| | - Dietrich Müller
- Department of Material Science, Faculty II, University of Applied Sciences and Arts Hannover, Germany
| | - Holger Zernetsch
- Institute for Multiphase Processes, Leibniz Universität Hannover, Germany
| | - Gerrit Paasche
- Department of Otolaryngology, Hannover Medical School, Germany.,Cluster of Excellence "Hearing4all", Hannover Medical School, Germany
| | - Ralf Sindelar
- Department of Material Science, Faculty II, University of Applied Sciences and Arts Hannover, Germany
| | - Birgit Glasmacher
- Institute for Multiphase Processes, Leibniz Universität Hannover, Germany
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13
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Li S, Tuft B, Xu L, Polacco M, Clarke JC, Guymon CA, Hansen MR. Intracellular calcium and cyclic nucleotide levels modulate neurite guidance by microtopographical substrate features. J Biomed Mater Res A 2016; 104:2037-48. [PMID: 27062708 DOI: 10.1002/jbm.a.35738] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Revised: 03/29/2016] [Accepted: 04/05/2016] [Indexed: 02/06/2023]
Abstract
Micro- and nanoscale surface features have emerged as potential tools to direct neurite growth into close proximity with next generation neural prosthesis electrodes. However, the signaling events underlying the ability of growth cones to respond to topographical features remain largely unknown. Accordingly, this study probes the influence of [Ca(2+) ]i and cyclic nucleotide levels on the ability of neurites from spiral ganglion neurons (SGNs) to precisely track topographical micropatterns. Photopolymerization and photomasking were used to generate micropatterned methacrylate polymer substrates. Dissociated SGN cultures were plated on the micropatterned surfaces. Calcium influx and release from internal stores were manipulated by elevating extracellular K(+) , maintenance in calcium-free media, or bath application of various calcium channel blockers. Cyclic nucleotide activity was increased by application of cpt-cAMP or 8-Br-cGMP. Elevation of [Ca(2+) ]i by treatment of cultures with elevated potassium reduced neurite alignment to physical microfeatures. Maintenance of cultures in Ca(2+) -free medium or treatment with the non-selective voltage-gated calcium channel blocker cadmium or L-type Ca(2+) channel blocker nifedipine did not signficantly alter SGN neurite alignment. By contrast, ryanodine or xestospongin C, which block release of internal calcium stores via ryanodine-sensitive channels or inositol-1,4,5-trisphosphate receptors respectively, each significantly decreased neurite alignment. Cpt-cAMP significantly reduced neurite alignment while 8-Br-cGMP significantly enhanced neurite alignment. Manipulation of [Ca(2+) ]i or cAMP levels significantly disrupts neurite guidance while elevation of cGMP levels increases neurite alignment. The results suggest intracellular signaling pathways similar to those recruited by chemotactic cues are involved in neurite guidance by topographical features. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 104A: 2037-2048, 2016.
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Affiliation(s)
- Shufeng Li
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, Iowa, 52242.,Department of Otolaryngology, Eye & ENT Hospital of Fudan University, Shanghai, 200031, China
| | - Bradley Tuft
- Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa, 52242
| | - Linjing Xu
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, Iowa, 52242
| | - Marc Polacco
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, Iowa, 52242
| | - Joseph C Clarke
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, Iowa, 52242
| | - C Allan Guymon
- Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa, 52242
| | - Marlan R Hansen
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, Iowa, 52242.,Department of Neurosurgery, University of Iowa, Iowa City, Iowa, 52242
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14
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Ostrovsky S, Hahnewald S, Kiran R, Mistrik P, Hessler R, Tscherter A, Senn P, Kang J, Kim J, Roccio M, Lellouche JP. Conductive hybrid carbon nanotube (CNT)–polythiophene coatings for innovative auditory neuron-multi-electrode array interfacing. RSC Adv 2016. [DOI: 10.1039/c5ra27642j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Surface modification of platinum electrodes to improve neuron-electrode interface and electrode conductive properties in cochlear implants.
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15
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Li S, Tuft BW, Xu L, Polacco MA, Clarke JC, Guymon CA, Hansen MR. Microtopographical features generated by photopolymerization recruit RhoA/ROCK through TRPV1 to direct cell and neurite growth. Biomaterials 2015; 53:95-106. [PMID: 25890710 DOI: 10.1016/j.biomaterials.2015.02.057] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Revised: 02/11/2015] [Accepted: 02/13/2015] [Indexed: 01/10/2023]
Abstract
Cell processes, including growth cones, respond to biophysical cues in their microenvironment to establish functional tissue architecture and intercellular networks. The mechanisms by which cells sense and translate biophysical cues into directed growth are unknown. We used photopolymerization to fabricate methacrylate platforms with patterned microtopographical features that precisely guide neurite growth and Schwann cell alignment. Pharmacologic inhibition of the transient receptor potential cation channel subfamily V member 1 (TRPV1) or reduced expression of TRPV1 by RNAi significantly disrupts neurite guidance by these microtopographical features. Exogenous expression of TRPV1 induces alignment of NIH3T3 fibroblasts that fail to align in the absence of TRPV1, further implicating TRPV1 channels as critical mediators of cellular responses to biophysical cues. Microtopographic features increase RhoA activity in growth cones and in TRPV1-expressing NIH3T3 cells. Further, Rho-associated kinase (ROCK) phosphorylation is elevated in growth cones and neurites on micropatterned surfaces. Inhibition of RhoA/ROCK by pharmacological compounds or reduced expression of either ROCKI or ROCKII isoforms by RNAi abolishes neurite and cell alignment, confirming that RhoA/ROCK signaling mediates neurite and cell alignment to microtopographic features. These studies demonstrate that microtopographical cues recruit TRPV1 channels and downstream signaling pathways, including RhoA and ROCK, to direct neurite and cell growth.
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Affiliation(s)
- Shufeng Li
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, IA 52242, USA; Department of Otolaryngology, EYE & ENT Hospital of Fudan University, Shanghai 200031, China
| | - Bradley W Tuft
- Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, IA 52242, USA
| | - Linjing Xu
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, IA 52242, USA
| | - Marc A Polacco
- Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, IA 52242, USA
| | - Joseph C Clarke
- Department of Otolaryngology-Head and Neck Surgery, 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
| | - 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.
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Fadeeva E, Deiwick A, Chichkov B, Schlie-Wolter S. Impact of laser-structured biomaterial interfaces on guided cell responses. Interface Focus 2014; 4:20130048. [PMID: 24501676 DOI: 10.1098/rsfs.2013.0048] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
To achieve a perfect integration of biomaterials into the body, tissue formation in contact with the interface has to be controlled. In this connection, a selective cell control is required: fibrotic encapsulation has to be inhibited, while tissue guidance has to be stimulated. As conventional biomaterials do not fulfil this specification, functionalization of the biointerface is under development to mimic the natural environment of the cells. One approach focuses on the fabrication of defined surface topographies. Thereby, ultrashort pulse laser ablation is very beneficial, owing to a large variety of fabricated structures, reduced heat-affected zones, high precision and reproducibility. We demonstrate that nanostructures in platinum and microstructures in silicon selectively control cell behaviour: inhibiting fibroblasts, while stimulating neuronal attachment and differentiation. However, the control of fibroblasts strongly correlates with the created size dimensions of the surface structures. These findings suggest favourable biomaterial interfaces for electronic devices. The mechanisms which are responsible for selective cell control are poorly understood. To give an insight, cell behaviour in dependence of biomaterial interfaces is discussed-including basic research on the role of the extracellular matrix. This knowledge is essential to understand such specific cell responses and to optimize biomaterial interfaces for future biomedical applications.
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Affiliation(s)
- Elena Fadeeva
- Laser Zentrum Hannover e.V. , Hollerithallee 8, 30419 Hannover , Germany
| | - Andrea Deiwick
- Laser Zentrum Hannover e.V. , Hollerithallee 8, 30419 Hannover , Germany
| | - Boris Chichkov
- Laser Zentrum Hannover e.V. , Hollerithallee 8, 30419 Hannover , Germany ; Institute of Quantum Optics , Leibniz University Hannover , Welfengarten 1, 30167 Hannover , Germany
| | - Sabrina Schlie-Wolter
- Laser Zentrum Hannover e.V. , Hollerithallee 8, 30419 Hannover , Germany ; Institute of Quantum Optics , Leibniz University Hannover , Welfengarten 1, 30167 Hannover , Germany
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Abstract
The advent of the cochlear implant is phenomenal because it is the first surgical prosthesis that is capable of restoring one of the senses. The subsequent rapid evolution of cochlear implants through increasing complexity and functionality has been synchronized with the recent advancements in biotechnology. Surface biotechnology has refined cochlear implants by directly influencing the implant–tissue interface. Emerging surface biotechnology strategies are exemplified by nanofibrous polymeric materials, topographical surface modification, conducting polymer coatings, and neurotrophin-eluting implants. Although these novel developments have received individual attention in the recent literature, the time has come to investigate their collective applications to cochlear implants to restore lost hearing.
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Kim MH, Park M, Kang K, Choi IS. Neurons on nanometric topographies: insights into neuronal behaviors in vitro. Biomater Sci 2013; 2:148-155. [PMID: 32481875 DOI: 10.1039/c3bm60255a] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Topography, the physical characteristics of an environment, is one of the most prominent stimuli neurons can encounter in the body. Many aspects of neurons and neuronal behavior are affected by the size, shape, and pattern of the physical features of the environment. A recent increase in the use of nanometric topographies, due to improved fabrication techniques, has resulted in new findings on neuronal behavior and development. Factors such as neuron adhesion, neurite alignment, and even the rate of neurite formation have all been highlighted through nanotopographies as complex phenomena that are driven by intricate intracellular mechanisms. Nanotopographies are suitable platforms, not only for fundamental studies on neuronal development, but also in practical applications, including multielectrode array devices and neuro-regenerative medicine. We reviewed recent publications that address the effects of nanotopography on neurons and categorized the observed behaviors as adherence, directional guidance, or accelerated outgrowth. We also discussed possible biological mechanisms of the molecular and cellular responses to topography, and suggested future perspectives for this field.
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Affiliation(s)
- Mi-Hee Kim
- Center for Cell-Encapsulation Research and Molecular-Level Interface Research Center, Department of Chemistry, KAIST, Daejeon 305-701, Korea
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