1
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Na Y, Jue H, Xia T, Li M, Xue X, Hua Y. A composite PET-matrix patch enhances tendon regeneration and tendon-to-bone integration for bridging repair of the chronic massive rotator cuff tears in a rabbit model. Regen Biomater 2024; 11:rbae061. [PMID: 38948337 PMCID: PMC11211210 DOI: 10.1093/rb/rbae061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 03/17/2024] [Accepted: 03/20/2024] [Indexed: 07/02/2024] Open
Abstract
In recent years, bridging repair has emerged as an effective approach for the treatment of massive rotator cuff tears (MRCTs). The objective of this study was to develop a composite patch that combines superior mechanical strength and biocompatibility and evaluate its potential for enhancing the outcomes of bridging repair for MRCTs. The composite patch, referred to as the PET-matrix patch (PM), was fabricated by immersing a plain-woven PET patch in decellularized matrix gel and utilizing the freeze-drying technique. The results demonstrated that the PM has reliable mechanical properties, with a maximum failure load of up to 480 N. The decellularized matrix sponge (DMS), present on the surface of the PM, displayed a loose and porous structure, with an average pore size of 62.51 μm and a porosity of 95.43%. In vitro experiments showed significant elongation of tenocytes on the DMS, with cells spanning across multiple pores and extending multiple protrusions as observed on SEM images. In contrast, tenocytes on the PET patch appeared smaller in size and lacked significant elongation. Additionally, the DMS facilitated the proliferation, migration and differentiation of tenocytes. In a rabbit model of chronic MRCTs, the PM group showed superior outcomes compared to the PET group at 4, 8 and 12 weeks after bridging repair. The PM group displayed significantly higher tendon maturing score, larger collagen diameter in the regenerated tendon and improved tendon-to-bone healing scores compared to the PET group (P < 0.05). Moreover, the maximum failure load of the tendon-bone complex in the PM group was significantly higher than that in the PET group (P < 0.05). In summary, the PM possesses reliable mechanical properties and excellent cytocompatibility, which can significantly improve the outcomes of bridging repair for chronic MRCTs in rabbits. Therefore, it holds great potential for clinical applications.
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Affiliation(s)
- Yuyan Na
- Department of Sports Medicine, Sports Medicine Institute of Fudan University, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Hao Jue
- Department of Sports Medicine, Sports Medicine Institute of Fudan University, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Tian Xia
- Department of Sports Medicine, Sports Medicine Institute of Fudan University, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Moxin Li
- Department of Sports Medicine, Sports Medicine Institute of Fudan University, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Xiaoao Xue
- Department of Sports Medicine, Sports Medicine Institute of Fudan University, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Yinghui Hua
- Department of Sports Medicine, Sports Medicine Institute of Fudan University, Huashan Hospital, Fudan University, Shanghai 200040, China
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2
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Martinier I, Fage F, Kakar A, Castagnino A, Saindoy E, Frederick J, Onorati I, Besnard V, Barakat AI, Dard N, Martinod E, Planes C, Trichet L, Fernandes FM. Tunable biomimetic materials elaborated by ice templating and self-assembly of collagen for tubular tissue engineering. Biomater Sci 2024; 12:3124-3140. [PMID: 38738995 DOI: 10.1039/d3bm01808c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/14/2024]
Abstract
Synthetic tubular grafts currently used in clinical context fail frequently, and the expectations that biomimetic materials could tackle these limitations are high. However, developing tubular materials presenting structural, compositional and functional properties close to those of native tissues remains an unmet challenge. Here we describe a combination of ice templating and topotactic fibrillogenesis of type I collagen, the main component of tissues' extracellular matrix, yielding highly concentrated yet porous tubular collagen materials with controlled hierarchical architecture at multiple length scales, the hallmark of native tissues' organization. By modulating the thermal conductivity of the cylindrical molds, we tune the macroscopic porosity defined by ice. Coupling the aforementioned porosity patterns with two different fibrillogenesis routes results in a new family of tubular materials whose textural features and the supramolecular arrangement of type I collagen are achieved. The resulting materials present hierarchical elastic properties and are successfully colonized by human endothelial cells and alveolar epithelial cells on the luminal side, and by human mesenchymal stem cells on the external side. The proposed straightforward protocol is likely to be adapted for larger graft sizes that address ever-growing clinical needs, such as peripheral arterial disease or tracheal and bronchial reconstructions.
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Affiliation(s)
- Isabelle Martinier
- Laboratoire de Chimie de la Matière Condensée de Paris, Sorbonne Université, 4 place Jussieu, 75005 Paris, France.
| | - Florian Fage
- Laboratoire de Chimie de la Matière Condensée de Paris, Sorbonne Université, 4 place Jussieu, 75005 Paris, France.
| | - Alshaba Kakar
- Laboratoire de Chimie de la Matière Condensée de Paris, Sorbonne Université, 4 place Jussieu, 75005 Paris, France.
| | - Alessia Castagnino
- LadHyX, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
| | - Emeline Saindoy
- Laboratoire Hypoxie & Poumon, Assistance Publique-Hôpitaux de Paris, Hôpitaux Universitaires Paris Seine-Saint-Denis, Hôpital Avicenne, Chirurgie Thoracique et Vasculaire, Université Paris 13, Sorbonne Paris Cité, UFR Santé, Médecine et Biologie Humaine, Bobigny, France
| | - Joni Frederick
- LadHyX, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
| | - Ilaria Onorati
- Laboratoire Hypoxie & Poumon, Assistance Publique-Hôpitaux de Paris, Hôpitaux Universitaires Paris Seine-Saint-Denis, Hôpital Avicenne, Chirurgie Thoracique et Vasculaire, Université Paris 13, Sorbonne Paris Cité, UFR Santé, Médecine et Biologie Humaine, Bobigny, France
| | - Valérie Besnard
- Laboratoire Hypoxie & Poumon, Assistance Publique-Hôpitaux de Paris, Hôpitaux Universitaires Paris Seine-Saint-Denis, Hôpital Avicenne, Chirurgie Thoracique et Vasculaire, Université Paris 13, Sorbonne Paris Cité, UFR Santé, Médecine et Biologie Humaine, Bobigny, France
| | - Abdul I Barakat
- LadHyX, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
| | - Nicolas Dard
- Laboratoire Hypoxie & Poumon, Assistance Publique-Hôpitaux de Paris, Hôpitaux Universitaires Paris Seine-Saint-Denis, Hôpital Avicenne, Chirurgie Thoracique et Vasculaire, Université Paris 13, Sorbonne Paris Cité, UFR Santé, Médecine et Biologie Humaine, Bobigny, France
| | - Emmanuel Martinod
- Laboratoire Hypoxie & Poumon, Assistance Publique-Hôpitaux de Paris, Hôpitaux Universitaires Paris Seine-Saint-Denis, Hôpital Avicenne, Chirurgie Thoracique et Vasculaire, Université Paris 13, Sorbonne Paris Cité, UFR Santé, Médecine et Biologie Humaine, Bobigny, France
| | - Carole Planes
- Laboratoire Hypoxie & Poumon, Assistance Publique-Hôpitaux de Paris, Hôpitaux Universitaires Paris Seine-Saint-Denis, Hôpital Avicenne, Chirurgie Thoracique et Vasculaire, Université Paris 13, Sorbonne Paris Cité, UFR Santé, Médecine et Biologie Humaine, Bobigny, France
| | - Léa Trichet
- Laboratoire de Chimie de la Matière Condensée de Paris, Sorbonne Université, 4 place Jussieu, 75005 Paris, France.
| | - Francisco M Fernandes
- Laboratoire de Chimie de la Matière Condensée de Paris, Sorbonne Université, 4 place Jussieu, 75005 Paris, France.
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3
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González-Duque MI, Flórez AM, Torres MA, Fontanilla MR. Composite Zonal Scaffolds of Collagen I/II for Meniscus Regeneration. ACS Biomater Sci Eng 2024; 10:2426-2441. [PMID: 38549452 DOI: 10.1021/acsbiomaterials.3c01737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
The meniscus is divided into three zones according to its vascularity: an external vascularized red-red zone mainly comprising collagen I, a red-white interphase zone mainly comprising collagens I and II, and an internal white-white zone rich in collagen II. Known scaffolds used to treat meniscal injuries do not reflect the chemical composition of the vascular areas of the meniscus. Therefore, in this study, four composite zonal scaffolds (named A, B, C, and D) were developed and characterized; the developed scaffolds exhibited the main chemical components of the external (collagen I), interphase (collagens I/II), and internal (collagen II) zones of the meniscus. Noncomposite scaffolds were also produced (named E), which had the same shape as the composite scaffolds but were entirely made of collagen I. The composite zonal scaffolds were prepared using different concentrations of collagen I and the same concentration of collagen II and were either cross-linked with genipin or not cross-linked. Porous, biodegradable, and hydrophilic scaffolds with an expected chemical composition were obtained. Their pore size was smaller than the size reported for the meniscus substitutes; however, all scaffolds allowed the adhesion and proliferation of human adipose-derived stem cells (hADSCs) and were not cytotoxic. Data from enzymatic degradation and hADSC proliferation assays were considered for choosing the cross-linked composite scaffolds along with the collagen I scaffold and to test if composite zonal scaffolds seeded with hADSC and cultured with differentiation medium produced fibrocartilage-like tissue different from that formed in noncomposite scaffolds. After 21 days of culture, hADSCs seeded on composite scaffolds afforded an extracellular matrix with aggrecan, whereas hADSCs seeded on noncomposite collagen I scaffolds formed a matrix-like fibrocartilage without aggrecan.
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Affiliation(s)
- Martha Isabel González-Duque
- Tissue Engineering Group, Departmento de Farmacia, Facultad de Ciencias, Universidad Nacional de Colombia, Av. Carrera 30 # 45-10, Bogotá 111321, D.C., Colombia
| | - Adriana Matilde Flórez
- Tissue Engineering Group, Departmento de Farmacia, Facultad de Ciencias, Universidad Nacional de Colombia, Av. Carrera 30 # 45-10, Bogotá 111321, D.C., Colombia
| | - María Alejandra Torres
- Tissue Engineering Group, Departmento de Farmacia, Facultad de Ciencias, Universidad Nacional de Colombia, Av. Carrera 30 # 45-10, Bogotá 111321, D.C., Colombia
| | - Marta Raquel Fontanilla
- Tissue Engineering Group, Departmento de Farmacia, Facultad de Ciencias, Universidad Nacional de Colombia, Av. Carrera 30 # 45-10, Bogotá 111321, D.C., Colombia
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4
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Zhou K, Wei W, Yang D, Zhang H, Yang W, Zhang Y, Nie Y, Hao M, Wang P, Ruan H, Zhang T, Wang S, Liu Y. Dual electrical stimulation at spinal-muscular interface reconstructs spinal sensorimotor circuits after spinal cord injury. Nat Commun 2024; 15:619. [PMID: 38242904 PMCID: PMC10799086 DOI: 10.1038/s41467-024-44898-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 01/09/2024] [Indexed: 01/21/2024] Open
Abstract
The neural signals produced by varying electrical stimulation parameters lead to characteristic neural circuit responses. However, the characteristics of neural circuits reconstructed by electrical signals remain poorly understood, which greatly limits the application of such electrical neuromodulation techniques for the treatment of spinal cord injury. Here, we develop a dual electrical stimulation system that combines epidural electrical and muscle stimulation to mimic feedforward and feedback electrical signals in spinal sensorimotor circuits. We demonstrate that a stimulus frequency of 10-20 Hz under dual stimulation conditions is required for structural and functional reconstruction of spinal sensorimotor circuits, which not only activates genes associated with axonal regeneration of motoneurons, but also improves the excitability of spinal neurons. Overall, the results provide insights into neural signal decoding during spinal sensorimotor circuit reconstruction, suggesting that the combination of epidural electrical and muscle stimulation is a promising method for the treatment of spinal cord injury.
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Affiliation(s)
- Kai Zhou
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Institute of Neuroscience, Soochow University; Clinical Research Center of Neurological Disease, The Second Affiliated Hospital of Soochow University, Suzhou, 215123, China
- Co-innovation Center of Neuroregeneration, Nantong University, Nantong, 226001, China
| | - Wei Wei
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Institute of Neuroscience, Soochow University; Clinical Research Center of Neurological Disease, The Second Affiliated Hospital of Soochow University, Suzhou, 215123, China
| | - Dan Yang
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Institute of Neuroscience, Soochow University; Clinical Research Center of Neurological Disease, The Second Affiliated Hospital of Soochow University, Suzhou, 215123, China
- Department of Anatomy, School of Basic Medical Science, Guizhou Medical University, Guiyang, 550025, China
| | - Hui Zhang
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Institute of Neuroscience, Soochow University; Clinical Research Center of Neurological Disease, The Second Affiliated Hospital of Soochow University, Suzhou, 215123, China
| | - Wei Yang
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Institute of Neuroscience, Soochow University; Clinical Research Center of Neurological Disease, The Second Affiliated Hospital of Soochow University, Suzhou, 215123, China
| | - Yunpeng Zhang
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu, 215163, China
| | - Yingnan Nie
- Institute of Science and Technology for Brain-Inspired Intelligence, Fudan University, Shanghai, 200433, China
| | - Mingming Hao
- i-Lab, Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou, Jiangsu, 215123, China
- Ningbo Medical Centre Lihuili Hospital, Ningbo, Zhejiang, 315048, China
| | - Pengcheng Wang
- Institutes of Biology and Medical Sciences, Soochow University, Suzhou, Jiangsu, 215123, China
| | - Hang Ruan
- Institutes of Biology and Medical Sciences, Soochow University, Suzhou, Jiangsu, 215123, China
| | - Ting Zhang
- i-Lab, Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou, Jiangsu, 215123, China
| | - Shouyan Wang
- Institute of Science and Technology for Brain-Inspired Intelligence, Fudan University, Shanghai, 200433, China
| | - Yaobo Liu
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Institute of Neuroscience, Soochow University; Clinical Research Center of Neurological Disease, The Second Affiliated Hospital of Soochow University, Suzhou, 215123, China.
- Co-innovation Center of Neuroregeneration, Nantong University, Nantong, 226001, China.
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5
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Kozan NG, Joshi M, Sicherer ST, Grasman JM. Porous biomaterial scaffolds for skeletal muscle tissue engineering. Front Bioeng Biotechnol 2023; 11:1245897. [PMID: 37854885 PMCID: PMC10579822 DOI: 10.3389/fbioe.2023.1245897] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Accepted: 09/18/2023] [Indexed: 10/20/2023] Open
Abstract
Volumetric muscle loss is a traumatic injury which overwhelms the innate repair mechanisms of skeletal muscle and results in significant loss of muscle functionality. Tissue engineering seeks to regenerate these injuries through implantation of biomaterial scaffolds to encourage endogenous tissue formation and to restore mechanical function. Many types of scaffolds are currently being researched for this purpose. Scaffolds are typically made from either natural, synthetic, or conductive polymers, or any combination therein. A major criterion for the use of scaffolds for skeletal muscle is their porosity, which is essential for myoblast infiltration and myofiber ingrowth. In this review, we summarize the various methods of fabricating porous biomaterial scaffolds for skeletal muscle regeneration, as well as the various types of materials used to make these scaffolds. We provide guidelines for the fabrication of scaffolds based on functional requirements of skeletal muscle tissue, and discuss the general state of the field for skeletal muscle tissue engineering.
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Affiliation(s)
| | | | | | - Jonathan M. Grasman
- Department of Biomedical Engineering, New Jersey Institute of Technology, Newark, NJ, United States
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6
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Caruso I, Yin K, Divakar P, Wegst UGK. Tensile properties of freeze-cast collagen scaffolds: How processing conditions affect structure and performance in the dry and fully hydrated states. J Mech Behav Biomed Mater 2023; 144:105897. [PMID: 37343356 PMCID: PMC10771887 DOI: 10.1016/j.jmbbm.2023.105897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 05/02/2023] [Accepted: 05/04/2023] [Indexed: 06/23/2023]
Abstract
Tensile properties of directionally freeze-cast biopolymer scaffolds are rarely reported, even though they are of interest from a fundamental science perspective and critical in applications such as scaffolds for the regeneration of nerves or when used as ureteral stents. The focus of this study is on collagen scaffolds freeze-cast with two different applied cooling rates (10 °C/min and 1 °C/min) in two freezing directions (longitudinal and radial). Reported are the results of a systematic structural characterization of dry scaffolds by scanning electron microscopy and the mechanical characterization in tension of both dry and fully hydrated scaffolds. Systematic structure-property-processing correlations are obtained for a comparison of the tensile performance of longitudinally and radially freeze-cast collagen scaffolds with their performance in compression. Collated, the correlations, obtained both in tension in this study and in compression for collagen and chitosan in two earlier reports, not only enable the custom-design of freeze-cast biopolymer scaffolds for biomedical applications but also provide new insights into similarities and differences of scaffold and cell-wall structure formation during the directional solidification of "smooth" and "fibrillar" biopolymers.
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Affiliation(s)
- Isabella Caruso
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA; Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Kaiyang Yin
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA; Department of Physics, Northeastern University, Boston, MA, USA; Department of Microsystems Engineering and Cluster of Excellence livMatS@FIT, University of Freiburg, Freiburg, Germany
| | - Prajan Divakar
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
| | - Ulrike G K Wegst
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA; Department of Physics, Northeastern University, Boston, MA, USA.
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7
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Katrilaka C, Karipidou N, Petrou N, Manglaris C, Katrilakas G, Tzavellas AN, Pitou M, Tsiridis EE, Choli-Papadopoulou T, Aggeli A. Freeze-Drying Process for the Fabrication of Collagen-Based Sponges as Medical Devices in Biomedical Engineering. MATERIALS (BASEL, SWITZERLAND) 2023; 16:4425. [PMID: 37374608 DOI: 10.3390/ma16124425] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 06/12/2023] [Accepted: 06/13/2023] [Indexed: 06/29/2023]
Abstract
This paper presents a systematic review of a key sector of the much promising and rapidly evolving field of biomedical engineering, specifically on the fabrication of three-dimensional open, porous collagen-based medical devices, using the prominent freeze-drying process. Collagen and its derivatives are the most popular biopolymers in this field, as they constitute the main components of the extracellular matrix, and therefore exhibit desirable properties, such as biocompatibility and biodegradability, for in vivo applications. For this reason, freeze-dried collagen-based sponges with a wide variety of attributes can be produced and have already led to a wide range of successful commercial medical devices, chiefly for dental, orthopedic, hemostatic, and neuronal applications. However, collagen sponges display some vulnerabilities in other key properties, such as low mechanical strength and poor control of their internal architecture, and therefore many studies focus on the settlement of these defects, either by tampering with the steps of the freeze-drying process or by combining collagen with other additives. Furthermore, freeze drying is still considered a high-cost and time-consuming process that is often used in a non-optimized manner. By applying an interdisciplinary approach and combining advances in other technological fields, such as in statistical analysis, implementing the Design of Experiments, and Artificial Intelligence, the opportunity arises to further evolve this process in a sustainable and strategic manner, and optimize the resulting products as well as create new opportunities in this field.
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Affiliation(s)
- Chrysoula Katrilaka
- Department of Chemical Engineering, School of Engineering, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Greece
| | - Niki Karipidou
- Department of Chemical Engineering, School of Engineering, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Greece
| | - Nestor Petrou
- Department of Chemical Engineering, School of Engineering, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Greece
| | - Chris Manglaris
- Department of Chemical Engineering, School of Engineering, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Greece
| | - George Katrilakas
- Department of Chemical Engineering, School of Engineering, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Greece
| | - Anastasios Nektarios Tzavellas
- 3rd Department of Orthopedics, School of Medicine, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Greece
| | - Maria Pitou
- School of Chemistry, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Greece
| | - Eleftherios E Tsiridis
- 3rd Department of Orthopedics, School of Medicine, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Greece
| | | | - Amalia Aggeli
- Department of Chemical Engineering, School of Engineering, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Greece
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8
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Sousa JPM, Stratakis E, Mano J, Marques PAAP. Anisotropic 3D scaffolds for spinal cord guided repair: Current concepts. BIOMATERIALS ADVANCES 2023; 148:213353. [PMID: 36848743 DOI: 10.1016/j.bioadv.2023.213353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 02/15/2023] [Accepted: 02/17/2023] [Indexed: 02/24/2023]
Abstract
A spinal cord injury (SCI) can be caused by unforeseen events such as a fall, a vehicle accident, a gunshot, or a malignant illness, which has a significant impact on the quality of life of the patient. Due to the limited regenerative potential of the central nervous system (CNS), SCI is one of the most daunting medical challenges of modern medicine. Great advances have been made in tissue engineering and regenerative medicine, which include the transition from two-dimensional (2D) to three-dimensional (3D) biomaterials. Combinatory treatments that use 3D scaffolds may significantly enhance the repair and regeneration of functional neural tissue. In an effort to mimic the chemical and physical properties of neural tissue, scientists are researching the development of the ideal scaffold made of synthetic and/or natural polymers. Moreover, in order to restore the architecture and function of neural networks, 3D scaffolds with anisotropic properties that replicate the native longitudinal orientation of spinal cord nerve fibres are being designed. In an effort to determine if scaffold anisotropy is a crucial property for neural tissue regeneration, this review focuses on the most current technological developments relevant to anisotropic scaffolds for SCI. Special consideration is given to the architectural characteristics of scaffolds containing axially oriented fibres, channels, and pores. By analysing neural cell behaviour in vitro and tissue integration and functional recovery in animal models of SCI, the therapeutic efficacy is evaluated for its successes and limitations.
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Affiliation(s)
- Joana P M Sousa
- TEMA - Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, Portugal; LASI - Intelligent Systems Associate Laboratory, Portugal; Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas (FORTH-IESL), Heraklion, Greece; CICECO - Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, Aveiro 3810-193, Portugal
| | - Emmanuel Stratakis
- Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas (FORTH-IESL), Heraklion, Greece
| | - João Mano
- CICECO - Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, Aveiro 3810-193, Portugal
| | - Paula A A P Marques
- TEMA - Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, Portugal; LASI - Intelligent Systems Associate Laboratory, Portugal.
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9
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Khan HM, Liao X, Sheikh BA, Wang Y, Su Z, Guo C, Li Z, Zhou C, Cen Y, Kong Q. Smart biomaterials and their potential applications in tissue engineering. J Mater Chem B 2022; 10:6859-6895. [PMID: 36069198 DOI: 10.1039/d2tb01106a] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Smart biomaterials have been rapidly advancing ever since the concept of tissue engineering was proposed. Interacting with human cells, smart biomaterials can play a key role in novel tissue morphogenesis. Various aspects of biomaterials utilized in or being sought for the goal of encouraging bone regeneration, skin graft engineering, and nerve conduits are discussed in this review. Beginning with bone, this study summarizes all the available bioceramics and materials along with their properties used singly or in conjunction with each other to create scaffolds for bone tissue engineering. A quick overview of the skin-based nanocomposite biomaterials possessing antibacterial properties for wound healing is outlined along with skin regeneration therapies using infrared radiation, electrospinning, and piezoelectricity, which aid in wound healing. Furthermore, a brief overview of bioengineered artificial skin grafts made of various natural and synthetic polymers has been presented. Finally, by examining the interactions between natural and synthetic-based biomaterials and the biological environment, their strengths and drawbacks for constructing peripheral nerve conduits are highlighted. The description of the preclinical outcome of nerve regeneration in injury healed with various natural-based conduits receives special attention. The organic and synthetic worlds collide at the interface of nanomaterials and biological systems, producing a new scientific field including nanomaterial design for tissue engineering.
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Affiliation(s)
- Haider Mohammed Khan
- Department of Orthopedics, West China Hospital, Sichuan University, 610041, Chengdu, China.
| | - Xiaoxia Liao
- Department of Burn and Plastic Surgery, West China School of Medicine, West China Hospital, Sichuan University, 610041, Chengdu, China.
| | - Bilal Ahmed Sheikh
- Department of Orthopedics, West China Hospital, Sichuan University, 610041, Chengdu, China.
| | - Yixi Wang
- Department of Burn and Plastic Surgery, West China School of Medicine, West China Hospital, Sichuan University, 610041, Chengdu, China.
| | - Zhixuan Su
- College of Biomedical Engineering, Sichuan University, Chengdu 610064, China.,National Engineering Research Centre for Biomaterials, Sichuan University, Chengdu 610064, China.
| | - Chuan Guo
- Department of Orthopedics, West China Hospital, Sichuan University, 610041, Chengdu, China.
| | - Zhengyong Li
- Department of Burn and Plastic Surgery, West China School of Medicine, West China Hospital, Sichuan University, 610041, Chengdu, China.
| | - Changchun Zhou
- College of Biomedical Engineering, Sichuan University, Chengdu 610064, China.,National Engineering Research Centre for Biomaterials, Sichuan University, Chengdu 610064, China.
| | - Ying Cen
- Department of Burn and Plastic Surgery, West China School of Medicine, West China Hospital, Sichuan University, 610041, Chengdu, China.
| | - Qingquan Kong
- Department of Orthopedics, West China Hospital, Sichuan University, 610041, Chengdu, China.
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10
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Flack JA, Sharma KD, Xie JY. Delving into the recent advancements of spinal cord injury treatment: a review of recent progress. Neural Regen Res 2022; 17:283-291. [PMID: 34269189 PMCID: PMC8463999 DOI: 10.4103/1673-5374.317961] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Spinal cord injury (SCI) research is a very complex field lending to why reviews of SCI literatures can be beneficial to current and future researchers. This review focuses on recent articles regarding potential modalities for the treatment and management of SCI. The modalities were broken down into four categories: neuroprotection-pharmacologic, neuroprotection-non-pharmacologic, neuroregeneration-pharmacologic, neuroregeneration-non-pharmacologic. Peer-reviewed articles were found using PubMed with search terms: "spinal cord injury", "spinal cord injury neuroregeneration", "olfactory ensheathing cells spinal cord injury", "rho-rock inhibitors spinal cord injury", "neural stem cell", "scaffold", "neural stem cell transplantation", "exosomes and SCI", "epidural stimulation SCI", "brain-computer interfaces and SCI". Most recent articles spanning two years were chosen for their relevance to the categories of SCI management and treatment. There has been a plethora of pre-clinical studies completed with their results being difficult to replicate in clinical studies. Therefore, scientists should focus on understanding and applying the results of previous research to develop more efficacious preclinical studies and clinical trials.
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Affiliation(s)
- Joseph A Flack
- Department of Basic Sciences, New York Institute of Technology College of Osteopathic Medicine at Arkansas State University, Jonesboro, AR, USA
| | - Krishna Deo Sharma
- Department of Biological Sciences and Arkansas Biosciences Institute, Arkansas State University, Jonesboro, AR, USA
| | - Jennifer Yanhua Xie
- Department of Basic Sciences, New York Institute of Technology College of Osteopathic Medicine at Arkansas State University, Jonesboro, AR, USA
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11
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Moncayo-Donoso M, Rico-Llanos GA, Garzón-Alvarado DA, Becerra J, Visser R, Fontanilla MR. The Effect of Pore Directionality of Collagen Scaffolds on Cell Differentiation and In Vivo Osteogenesis. Polymers (Basel) 2021; 13:polym13183187. [PMID: 34578088 PMCID: PMC8470614 DOI: 10.3390/polym13183187] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 09/13/2021] [Accepted: 09/14/2021] [Indexed: 01/01/2023] Open
Abstract
Although many bone substitutes have been designed and produced, the development of bone tissue engineering products that mimic the microstructural characteristics of native bone remains challenging. It has been shown that pore orientation within collagen scaffolds influences bone matrix formation by the endochondral route. In addition, that the unidirectional orientation of the scaffolds can limit the growth of blood vessels. However, a comparison between the amount of bone that can be formed in scaffolds with different pore orientations in addition to analyzing the effect of loading osteogenic and proangiogenic factors is still required. In this work we fabricated uni- and multidirectional collagen sponges and evaluated their microstructural, physicochemical, mechanical and biological characteristics. Although the porosity and average pore size of the uni- and multidirectional scaffolds was similar (94.5% vs. 97.1% and 260 µm vs. 269 µm, respectively) the unidirectional sponges had a higher tensile strength, Young's modulus and capacity to uptake liquids than the multidirectional ones (0.271 MPa vs. 0.478 MPa, 9.623 MPa vs. 3.426 MPa and 8000% mass gain vs. 4000%, respectively). Culturing of rat bone marrow mesenchymal stem cells demonstrated that these scaffolds support cell growth and osteoblastic differentiation in the presence of BMP-2 in vitro, although the pore orientation somehow affected cell attachment and differentiation. The evaluation of the ability of the scaffolds to support bone growth when loaded with BMP-2 or BMP-2 + VEGF in an ectopic rat model showed that they both supported bone formation. Histological analysis and quantification of mineralized matrix revealed that the pore orientation of the collagen scaffolds influenced the osteogenic process.
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Affiliation(s)
- Miguelangel Moncayo-Donoso
- Tissue Engineering Group, Department of Pharmacy, Universidad Nacional de Colombia, Bogotá 571, Colombia;
- Biomimetics Laboratory, Biotechnology Institute, Universidad Nacional de Colombia, Bogotá 571, Colombia;
- BIONAND, Andalusian Center for Nanomedicine and Biotechnology, University of Malaga, 29001-29018 Malaga, Spain; (G.A.R.-L.); (J.B.)
| | - Gustavo A. Rico-Llanos
- BIONAND, Andalusian Center for Nanomedicine and Biotechnology, University of Malaga, 29001-29018 Malaga, Spain; (G.A.R.-L.); (J.B.)
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine, CIBER-BBN, 29001-29018 Malaga, Spain
| | - Diego A. Garzón-Alvarado
- Biomimetics Laboratory, Biotechnology Institute, Universidad Nacional de Colombia, Bogotá 571, Colombia;
| | - José Becerra
- BIONAND, Andalusian Center for Nanomedicine and Biotechnology, University of Malaga, 29001-29018 Malaga, Spain; (G.A.R.-L.); (J.B.)
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine, CIBER-BBN, 29001-29018 Malaga, Spain
- Department of Cell Biology, Genetics and Physiology, University of Malaga, IBIMA, 29001-29018 Malaga, Spain
| | - Rick Visser
- BIONAND, Andalusian Center for Nanomedicine and Biotechnology, University of Malaga, 29001-29018 Malaga, Spain; (G.A.R.-L.); (J.B.)
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine, CIBER-BBN, 29001-29018 Malaga, Spain
- Department of Cell Biology, Genetics and Physiology, University of Malaga, IBIMA, 29001-29018 Malaga, Spain
- Correspondence: (R.V.); (M.R.F.)
| | - Marta R. Fontanilla
- Tissue Engineering Group, Department of Pharmacy, Universidad Nacional de Colombia, Bogotá 571, Colombia;
- Correspondence: (R.V.); (M.R.F.)
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12
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Meek MC, Best S, Cameron R. The effects of despeckling filters on pore size measurements in collagen scaffold micro-CT data. J Microsc 2021; 284:142-156. [PMID: 34296436 DOI: 10.1111/jmi.13050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 07/15/2021] [Indexed: 11/30/2022]
Abstract
Micro-CT is often used to assess the characteristics of porous structures such as tissue engineering scaffolds and trabecular bone. Prior to analysis, micro-CT images can be thresholded and filtered to remove noise. Scaffold pore size affects mechanical properties and biological cell behaviour and is a frequently assessed parameter. This paper identifies and characterizes an artefact affecting a commonly used filter which erroneously increases mean pore size. The 3D sweep despeckling filter removes all but the largest object within a volume of interest, and therefore deletes any disconnected objects located at the periphery, increasing measured mean pore size. This artefact is characterized, and effective methods to mitigate its effects are devised, involving despeckling a sufficiently large volume of interest, then reducing the volume of interest in size to remove the error prior to analysis. Techniques to effectively apply this method to other data sets are described. This method eliminates the artefact but is time-consuming and computationally expensive. Alternative, more economical filters which remove objects below a specified size are also assessed but are shown to be affected by the same artefact. These results will help to guide the implementation of future studies investigating the effects of pore size.
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Affiliation(s)
- Matt C Meek
- Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK
| | - Serena Best
- Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK
| | - Ruth Cameron
- Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK
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13
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Masullo U, Cavallo A, Greco MR, Reshkin SJ, Mastrodonato M, Gallo N, Salvatore L, Verri T, Sannino A, Cardone RA, Madaghiele M. Semi-interpenetrating polymer network cryogels based on poly(ethylene glycol) diacrylate and collagen as potential off-the-shelf platforms for cancer cell research. J Biomed Mater Res B Appl Biomater 2021; 109:1313-1326. [PMID: 33427396 DOI: 10.1002/jbm.b.34792] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 12/23/2020] [Accepted: 12/27/2020] [Indexed: 01/09/2023]
Abstract
In the present work, we investigated the potential of novel semi-interpenetrating polymer network (semi-IPN) cryogels, obtained through ultraviolet exposure of aqueous mixtures of poly(ethylene glycol) diacrylate and type I collagen, as tunable off-the-shelf platforms for 3D cancer cell research. We synthesized semi-IPN cryogels with variable collagen amounts (0.1% and 1% w/v) and assessed the effect of collagen on key cryogel properties for cell culture, for example, porosity, degradation rate and mechanical stiffness. Then, we investigated the ability of the cryogels to sustain the long-term growth of two pancreatic ductal adenocarcinoma (PDAC) cell populations, the parenchymal Panc1 cells and their derived cancer stem cells. Results revealed that both cell lines efficiently infiltrated, attached and expanded in the cryogels over a period of 14 days. However, only when grown in the cryogels with the highest collagen concentration, both cell lines reproduced their characteristic growth pattern previously observed in collagen-enriched organotypic cultures, biomimetic of the highly fibrotic PDAC stroma. Cellular preembedding in Matrigel, that is, the classical approach to develop/grow organoids, interfered with an efficient intra-scaffold migration and growth. Although preliminary, these findings highlight the potential of the proposed cryogels as reproducible and tunable cancer cell research platforms.
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Affiliation(s)
- Ugo Masullo
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
| | - Anna Cavallo
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
| | - Maria Raffaella Greco
- Department of Bioscience, Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - Stephan J Reshkin
- Department of Bioscience, Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | | | - Nunzia Gallo
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
| | - Luca Salvatore
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
| | - Tiziano Verri
- Department of Biological and Environmental Sciences and Technologies, University of Salento, Lecce, Italy
| | - Alessandro Sannino
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
| | - Rosa Angela Cardone
- Department of Bioscience, Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - Marta Madaghiele
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
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14
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Majid QA, Fricker ATR, Gregory DA, Davidenko N, Hernandez Cruz O, Jabbour RJ, Owen TJ, Basnett P, Lukasiewicz B, Stevens M, Best S, Cameron R, Sinha S, Harding SE, Roy I. Natural Biomaterials for Cardiac Tissue Engineering: A Highly Biocompatible Solution. Front Cardiovasc Med 2020; 7:554597. [PMID: 33195451 PMCID: PMC7644890 DOI: 10.3389/fcvm.2020.554597] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Accepted: 09/10/2020] [Indexed: 02/06/2023] Open
Abstract
Cardiovascular diseases (CVD) constitute a major fraction of the current major global diseases and lead to about 30% of the deaths, i.e., 17.9 million deaths per year. CVD include coronary artery disease (CAD), myocardial infarction (MI), arrhythmias, heart failure, heart valve diseases, congenital heart disease, and cardiomyopathy. Cardiac Tissue Engineering (CTE) aims to address these conditions, the overall goal being the efficient regeneration of diseased cardiac tissue using an ideal combination of biomaterials and cells. Various cells have thus far been utilized in pre-clinical studies for CTE. These include adult stem cell populations (mesenchymal stem cells) and pluripotent stem cells (including autologous human induced pluripotent stem cells or allogenic human embryonic stem cells) with the latter undergoing differentiation to form functional cardiac cells. The ideal biomaterial for cardiac tissue engineering needs to have suitable material properties with the ability to support efficient attachment, growth, and differentiation of the cardiac cells, leading to the formation of functional cardiac tissue. In this review, we have focused on the use of biomaterials of natural origin for CTE. Natural biomaterials are generally known to be highly biocompatible and in addition are sustainable in nature. We have focused on those that have been widely explored in CTE and describe the original work and the current state of art. These include fibrinogen (in the context of Engineered Heart Tissue, EHT), collagen, alginate, silk, and Polyhydroxyalkanoates (PHAs). Amongst these, fibrinogen, collagen, alginate, and silk are isolated from natural sources whereas PHAs are produced via bacterial fermentation. Overall, these biomaterials have proven to be highly promising, displaying robust biocompatibility and, when combined with cells, an ability to enhance post-MI cardiac function in pre-clinical models. As such, CTE has great potential for future clinical solutions and hence can lead to a considerable reduction in mortality rates due to CVD.
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Affiliation(s)
- Qasim A. Majid
- Faculty of Medicine, National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Annabelle T. R. Fricker
- Department of Material Science and Engineering, Faculty of Engineering, University of Sheffield, Sheffield, United Kingdom
| | - David A. Gregory
- Department of Material Science and Engineering, Faculty of Engineering, University of Sheffield, Sheffield, United Kingdom
| | - Natalia Davidenko
- Department of Materials Science and Metallurgy, Cambridge Centre for Medical Materials, University of Cambridge, Cambridge, United Kingdom
| | - Olivia Hernandez Cruz
- Faculty of Medicine, National Heart and Lung Institute, Imperial College London, London, United Kingdom
- Department of Bioengineering, Department of Materials, IBME, Faculty of Engineering, Imperial College London, United Kingdom
| | - Richard J. Jabbour
- Faculty of Medicine, National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Thomas J. Owen
- Faculty of Medicine, National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Pooja Basnett
- Applied Biotechnology Research Group, School of Life Sciences, College of Liberal Arts and Sciences, University of Westminster, London, United Kingdom
| | - Barbara Lukasiewicz
- Applied Biotechnology Research Group, School of Life Sciences, College of Liberal Arts and Sciences, University of Westminster, London, United Kingdom
| | - Molly Stevens
- Department of Bioengineering, Department of Materials, IBME, Faculty of Engineering, Imperial College London, United Kingdom
| | - Serena Best
- Department of Materials Science and Metallurgy, Cambridge Centre for Medical Materials, University of Cambridge, Cambridge, United Kingdom
| | - Ruth Cameron
- Department of Materials Science and Metallurgy, Cambridge Centre for Medical Materials, University of Cambridge, Cambridge, United Kingdom
| | - Sanjay Sinha
- Wellcome-MRC Cambridge Stem Cell Institute, University of Cambridge, Cambridge, United Kingdom
| | - Sian E. Harding
- Faculty of Medicine, National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Ipsita Roy
- Faculty of Medicine, National Heart and Lung Institute, Imperial College London, London, United Kingdom
- Department of Material Science and Engineering, Faculty of Engineering, University of Sheffield, Sheffield, United Kingdom
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15
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Gallo L, Madaghiele M, Salvatore L, Barca A, Scialla S, Bettini S, Valli L, Verri T, Bucalá V, Sannino A. Integration of PLGA Microparticles in Collagen-Based Matrices: Tunable Scaffold Properties and Interaction Between Microparticles and Human Epithelial-Like Cells. INT J POLYM MATER PO 2020. [DOI: 10.1080/00914037.2018.1552857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- L.C. Gallo
- Department of Biology, Biochemistry and Pharmacy, Universidad Nacional del Sur, Bahía Blanca, Argentina
- Pilot Plant of Chemical Engineering, PLAPIQUI (UNS-CONICET), Bahía Blanca, Argentina
| | - M. Madaghiele
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
| | - L. Salvatore
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
| | - A. Barca
- Department of Biological and Environmental Sciences and Technologies, University of Salento, Lecce, Italy
| | - S. Scialla
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
| | - S. Bettini
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
| | - L. Valli
- Department of Biological and Environmental Sciences and Technologies, University of Salento, Lecce, Italy
| | - T. Verri
- Department of Biological and Environmental Sciences and Technologies, University of Salento, Lecce, Italy
| | - V. Bucalá
- Pilot Plant of Chemical Engineering, PLAPIQUI (UNS-CONICET), Bahía Blanca, Argentina
- Department of Chemical Engineering, Universidad Nacional del Sur, Bahía Blanca, Argentina
| | - A. Sannino
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
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16
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Chen X, Wu J, Sun R, Zhao Y, Li Y, Pan J, Chen Y, Wang X. Tubular scaffold with microchannels and an H-shaped lumen loaded with bone marrow stromal cells promotes neuroregeneration and inhibits apoptosis after spinal cord injury. J Tissue Eng Regen Med 2020; 14:397-411. [PMID: 31821733 PMCID: PMC7155140 DOI: 10.1002/term.2996] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Revised: 11/13/2019] [Accepted: 11/19/2019] [Indexed: 12/11/2022]
Abstract
As a result of its complex histological structure, regeneration patterns of grey and white matter are quite different in the spinal cord. Therefore, tissue engineering scaffolds for repairing spinal cord injury must be able to adapt to varying neural regeneration patterns. The aim of the present study was to improve a previously reported spinal cord‐mimicking partition‐type scaffold by adding microchannels on a single tubular wall along its longitudinal axis, thus integrating the two architectures of a single H‐shaped central tube and many microchannels. Next, the integrated scaffold was loaded with bone marrow stromal cells (BMSCs) and transplanted to bridge the 5‐mm defect of a complete transverse lesion in the thoracic spinal cord of rats. Subsequently, effects on nerve regeneration, locomotion function recovery, and early neuroprotection were observed. After 1 year of repair, the integrated scaffold could guide the regeneration of axons appearing in the debris of degraded microchannels, especially serotonin receptor 1A receptor‐positive axonal tracts, which were relatively orderly arranged. Moreover, a network of nerve fibres was present, and a few BMSCs expressed neuronal markers in tubular lumens. Functionally, electrophysiological and locomotor functions of rats were partially recovered. In addition, we found that BMSCs could protect neurons and oligodendrocytes from apoptosis during the early stage of implantation. Taken together, our results demonstrate the potential of this novel integrated scaffold loaded with BMSCs to promote spinal cord regeneration through mechanical guidance and neuroprotective mechanisms.
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Affiliation(s)
- Xue Chen
- Department of Histology and Embryology, Medical College, Nantong University, Nantong, Jiangsu, China.,Wuxi Medical College, Jiangnan University, Wuxi, Jiangsu, China
| | - Jian Wu
- Department of Histology and Embryology, Medical College, Nantong University, Nantong, Jiangsu, China
| | - Rongcheng Sun
- Department of Histology and Embryology, Medical College, Nantong University, Nantong, Jiangsu, China
| | - Yahong Zhao
- Jiangsu Key Laboratory of Neuroregeneration, Nantong University, Nantong, Jiangsu, China
| | - Yi Li
- Department of Histology and Embryology, Medical College, Nantong University, Nantong, Jiangsu, China
| | - Jingying Pan
- Department of Histology and Embryology, Medical College, Nantong University, Nantong, Jiangsu, China
| | - Ying Chen
- Department of Histology and Embryology, Medical College, Nantong University, Nantong, Jiangsu, China
| | - Xiaodong Wang
- Department of Histology and Embryology, Medical College, Nantong University, Nantong, Jiangsu, China.,Key Laboratory for Neuroregeneration of Ministry of Education and Co-innovation Center for Neuroregeneration of Jiangsu Province, Nantong University, Nantong, Jiangsu, China
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17
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Grier WK, Sun Han Chang RA, Ramsey MD, Harley BA. The influence of cyclic tensile strain on multi-compartment collagen-GAG scaffolds for tendon-bone junction repair. Connect Tissue Res 2019; 60:530-543. [PMID: 31007094 PMCID: PMC6706312 DOI: 10.1080/03008207.2019.1601183] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Background: Orthopedic injuries often occur at the interface between soft tissues and bone. The tendon-bone junction (TBJ) is a classic example of such an interface. Current clinical strategies for TBJ injuries prioritize mechanical reattachment over regeneration of the native interface, resulting in poor outcomes. The need to promote regenerative healing of spatially-graded tissues inspires our effort to develop new tissue engineering technologies that replicate features of the spatially-graded extracellular matrix and strain profiles across the native TBJ. Materials and Methods: We recently described a biphasic collagen-glycosaminoglycan (CG) scaffold containing distinct compartment with divergent mineral content and structural alignment (isotropic vs. anisotropic) linked by a continuous interface zone to mimic structural and compositional features of the native TBJ. Results: Here, we report application of cyclic tensile strain (CTS) to the scaffold via a bioreactor leads to non-uniform strain profiles across the spatially-graded scaffold. Further, combinations of CTS and matrix structural features promote rapid, spatially-distinct differentiation profiles of human bone marrow-derived mesenchymal stem cells (MSCs) down multiple osteotendinous lineages. CTS preferentially upregulates MSC activity and tenogenic differentiation in the anisotropic region of the scaffold. This work demonstrates a tissue engineering approach that couples instructive biomaterials with cyclic tensile stimuli to promote regenerative healing of orthopedic interfaces.
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Affiliation(s)
- William K. Grier
- Dept. Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
| | - Raul A. Sun Han Chang
- Dept. Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
| | - Matthew D. Ramsey
- Dept. Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
| | - Brendan A.C. Harley
- Dept. Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801,Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801
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18
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Ghorbani F, Zamanian A, Kermanian F, Shamoosi A. A bioinspired 3D shape olibanum‐collagen‐gelatin scaffolds with tunable porous microstructure for efficient neural tissue regeneration. Biotechnol Prog 2019; 36:e2918. [DOI: 10.1002/btpr.2918] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Revised: 07/14/2019] [Accepted: 09/17/2019] [Indexed: 01/23/2023]
Affiliation(s)
- Farnaz Ghorbani
- Department of Orthopedics, Shanghai Pudong HospitalFudan University Pudong Medical Center Shanghai China
| | - Ali Zamanian
- Department of Nanotechnology and Advanced MaterialsMaterials and Energy Research Center Karaj Iran
| | - Fatemeh Kermanian
- Department of Anatomy, School of MedicineAlborz University of Medical Sciences Karaj Iran
| | - Atefeh Shamoosi
- Department of Anatomy, School of MedicineAlborz University of Medical Sciences Karaj Iran
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19
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Ghorbani F, Zamanian A, Shams A, Shamoosi A, Aidun A. Fabrication and characterisation of super-paramagnetic responsive PLGA-gelatine-magnetite scaffolds with the unidirectional porous structure: a physicochemical, mechanical, and in vitro evaluation. IET Nanobiotechnol 2019; 13:860-867. [PMID: 31625528 PMCID: PMC8676357 DOI: 10.1049/iet-nbt.2018.5305] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 07/02/2019] [Accepted: 07/15/2019] [Indexed: 10/28/2023] Open
Abstract
Architecture and composition of Scaffolds are influential factors in the regeneration of defects. Herein, synthesised iron oxide (magnetite) nanoparticles (MNPs) by co-precipitation technique were evenly distributed in polylactic-co-glycolic acid (PLGA)-gelatine Scaffolds. Hybrid structures were fabricated by freeze-casting method to the creation of a matrix with tunable pores. The synthesised MNPs were characterised by transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, and vibrating sample magnetometer analysis. Scanning electron microscopy micrographs of porous Scaffolds confirmed the formation of unidirectional microstructure, so that pore size measurement indicated the orientation of pores in the direction of solvent solidification. The addition of MNPs to the PLGA-gelatine Scaffolds had no particular effect on the morphology of the pores, but reduced slightly pore size distribution. The MNPs contained constructs demonstrated increased mechanical strength, but a reduced absorption capacity and biodegradation ratio. Stability of the MNPs and lack of iron release was the point of strength in this investigation and were determined by atomic absorption spectroscopy. The evolution of rat bone marrow mesenchymal stem cells performance on the hybrid structure under a static magnetic field indicated the potential of super-paramagnetic constructs for further pre-clinical and clinical studies in the field of neural regeneration.
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Affiliation(s)
- Farnaz Ghorbani
- Department of Nanotechnology and Advanced Materials, Materials and Energy Research Center, Karaj, Iran
| | - Ali Zamanian
- Department of Nanotechnology and Advanced Materials, Materials and Energy Research Center, Karaj, Iran.
| | - Alireza Shams
- Department of Anatomy, School of Medicine, Alborz University of Medical Sciences, Karaj, Iran
| | - Atefeh Shamoosi
- Department of Anatomy, School of Medicine, Alborz University of Medical Sciences, Karaj, Iran
| | - Amir Aidun
- Tissues and Biomaterials Research Group (TBRG), Universal Scientific Education and Research Network (USERN), Tehran, Iran
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20
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Natarajan A, Sethumadhavan A, Krishnan UM. Toward Building the Neuromuscular Junction: In Vitro Models To Study Synaptogenesis and Neurodegeneration. ACS OMEGA 2019; 4:12969-12977. [PMID: 31460423 PMCID: PMC6682064 DOI: 10.1021/acsomega.9b00973] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 07/04/2019] [Indexed: 06/10/2023]
Abstract
The neuromuscular junction (NMJ) is a unique, specialized chemical synapse that plays a crucial role in transmitting and amplifying information from spinal motor neurons to skeletal muscles. NMJ complexity ensures closely intertwined interactions between numerous synaptic vesicles, signaling molecules, ion channels, motor neurons, glia, and muscle fibers, making it difficult to dissect the underlying mechanisms and factors affecting neurodegeneration and muscle loss. Muscle fiber or motor neuron cell death followed by rapid axonal degeneration due to injury or disease has a debilitating effect on movement and behavior, which adversely affects the quality of life. It thus becomes imperative to study the synapse and intercellular signaling processes that regulate plasticity at the NMJ and elucidate mechanisms and pathways at the cellular level. Studies using in vitro 2D cell cultures have allowed us to gain a fundamental understanding of how the NMJ functions. However, they do not provide information on the intricate signaling networks that exist between NMJs and the biological environment. The advent of 3D cell cultures and microfluidic lab-on-a-chip technologies has opened whole new avenues to explore the NMJ. In this perspective, we look at the challenges involved in building a functional NMJ and the progress made in generating models for studying the NMJ, highlighting the current and future applications of these models.
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Affiliation(s)
- Anupama Natarajan
- Centre
for Nanotechnology & Advanced Biomaterials (CeNTAB), School of Chemical
& Biotechnology, and School of Arts, Science & Humanities, SASTRA Deemed University, Thanjavur 613 401, India
| | - Anjali Sethumadhavan
- Centre
for Nanotechnology & Advanced Biomaterials (CeNTAB), School of Chemical
& Biotechnology, and School of Arts, Science & Humanities, SASTRA Deemed University, Thanjavur 613 401, India
| | - Uma Maheswari Krishnan
- Centre
for Nanotechnology & Advanced Biomaterials (CeNTAB), School of Chemical
& Biotechnology, and School of Arts, Science & Humanities, SASTRA Deemed University, Thanjavur 613 401, India
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21
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Von den Hoff JW, Carvajal Monroy PL, Ongkosuwito EM, van Kuppevelt TH, Daamen WF. Muscle fibrosis in the soft palate: Delivery of cells, growth factors and anti-fibrotics. Adv Drug Deliv Rev 2019; 146:60-76. [PMID: 30107211 DOI: 10.1016/j.addr.2018.08.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Revised: 06/29/2018] [Accepted: 08/06/2018] [Indexed: 02/07/2023]
Abstract
The healing of skeletal muscle injuries after major trauma or surgical reconstruction is often complicated by the development of fibrosis leading to impaired function. Research in the field of muscle regeneration is mainly focused on the restoration of muscle mass while far less attention is paid to the prevention of fibrosis. In this review, we take as an example the reconstruction of the muscles in the soft palate of cleft palate patients. After surgical closure of the soft palate, muscle function during speech is often impaired by a shortage of muscle tissue as well as the development of fibrosis. We will give a short overview of the most common approaches to generate muscle mass and then focus on strategies to prevent fibrosis. These include anti-fibrotic strategies that have been developed for muscle and other organs by the delivery of small molecules, decorin and miRNAs. Anti-fibrotic compounds should be delivered in aligned constructs in order to obtain the organized architecture of muscle tissue. The available techniques for the preparation of aligned muscle constructs will be discussed. The combination of approaches to generate muscle mass with anti-fibrotic components in an aligned muscle construct may greatly improve the functional outcome of regenerative therapies for muscle injuries.
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Affiliation(s)
- Johannes W Von den Hoff
- Department of Orthodontics and Craniofacial Biology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, P.O. Box 9101, 6500HB Nijmegen, The Netherlands.
| | - Paola L Carvajal Monroy
- Department of Oral and Maxillofacial Surgery, Special Dental Care and Orthodontics, Erasmus Medical Center, P.O. Box 2060, 3000CB Rotterdam, The Netherlands.
| | - Edwin M Ongkosuwito
- Department of Orthodontics and Craniofacial Biology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, P.O. Box 9101, 6500HB Nijmegen, The Netherlands.
| | - Toin H van Kuppevelt
- Department of Biochemistry, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, P.O. Box 9101, 6500HB Nijmegen, The Netherlands.
| | - Willeke F Daamen
- Department of Biochemistry, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, P.O. Box 9101, 6500HB Nijmegen, The Netherlands.
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22
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Rieu C, Parisi C, Mosser G, Haye B, Coradin T, Fernandes FM, Trichet L. Topotactic Fibrillogenesis of Freeze-Cast Microridged Collagen Scaffolds for 3D Cell Culture. ACS APPLIED MATERIALS & INTERFACES 2019; 11:14672-14683. [PMID: 30913387 DOI: 10.1021/acsami.9b03219] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Type I collagen is the main component of the extracellular matrix (ECM). In vitro, under a narrow window of physicochemical conditions, type I collagen self-assembles to form complex supramolecular architectures reminiscent of those found in native ECM. Presently, a major challenge in collagen-based biomaterials is to couple the delicate collagen fibrillogenesis events with a controlled shaping process in non-denaturating conditions. In this work, an ice-templating approach promoting the structuration of collagen into macroporous monoliths is used. Instead of common solvent removal procedures, a new topotactic conversion approach yielding self-assembled ordered fibrous materials is implemented. These collagen-only, non-cross-linked scaffolds exhibit uncommon mechanical properties in the wet state, with a Young's modulus of 33 ± 12 kPa, an ultimate tensile stress of 33 ± 6 kPa, and a strain at failure of 105 ± 28%. With the help of the ice-patterned microridge features, normal human dermal fibroblasts and C2C12 murine myoblasts successfully migrate and form highly aligned populations within the resulting three-dimensional (3D) collagen scaffolds. These results open a new pathway to the development of new tissue engineering scaffolds ordered across various organization levels from the molecule to the macropore and are of particular interest for biomedical applications where large-scale 3D cell alignment is needed such as for muscular or nerve reconstruction.
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Affiliation(s)
- Clément Rieu
- Sorbonne Université, CNRS, Laboratoire de Chimie de la Matière Condensée de Paris, Pierre and Marie Curie Campus , 4 place Jussieu , 75252 Paris Cedex 05 , France
| | - Cleo Parisi
- Sorbonne Université, CNRS, Laboratoire de Chimie de la Matière Condensée de Paris, Pierre and Marie Curie Campus , 4 place Jussieu , 75252 Paris Cedex 05 , France
| | - Gervaise Mosser
- Sorbonne Université, CNRS, Laboratoire de Chimie de la Matière Condensée de Paris, Pierre and Marie Curie Campus , 4 place Jussieu , 75252 Paris Cedex 05 , France
| | - Bernard Haye
- Sorbonne Université, CNRS, Laboratoire de Chimie de la Matière Condensée de Paris, Pierre and Marie Curie Campus , 4 place Jussieu , 75252 Paris Cedex 05 , France
| | - Thibaud Coradin
- Sorbonne Université, CNRS, Laboratoire de Chimie de la Matière Condensée de Paris, Pierre and Marie Curie Campus , 4 place Jussieu , 75252 Paris Cedex 05 , France
| | - Francisco M Fernandes
- Sorbonne Université, CNRS, Laboratoire de Chimie de la Matière Condensée de Paris, Pierre and Marie Curie Campus , 4 place Jussieu , 75252 Paris Cedex 05 , France
| | - Léa Trichet
- Sorbonne Université, CNRS, Laboratoire de Chimie de la Matière Condensée de Paris, Pierre and Marie Curie Campus , 4 place Jussieu , 75252 Paris Cedex 05 , France
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23
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Meyer M. Processing of collagen based biomaterials and the resulting materials properties. Biomed Eng Online 2019; 18:24. [PMID: 30885217 PMCID: PMC6423854 DOI: 10.1186/s12938-019-0647-0] [Citation(s) in RCA: 235] [Impact Index Per Article: 47.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Accepted: 03/12/2019] [Indexed: 02/07/2023] Open
Abstract
Collagen, the most abundant extracellular matrix protein in animal kingdom belongs to a family of fibrous proteins, which transfer load in tissues and which provide a highly biocompatible environment for cells. This high biocompatibility makes collagen a perfect biomaterial for implantable medical products and scaffolds for in vitro testing systems. To manufacture collagen based solutions, porous sponges, membranes and threads for surgical and dental purposes or cell culture matrices, collagen rich tissues as skin and tendon of mammals are intensively processed by physical and chemical means. Other tissues such as pericardium and intestine are more gently decellularized while maintaining their complex collagenous architectures. Tissue processing technologies are organized as a series of steps, which are combined in different ways to manufacture structurally versatile materials with varying properties in strength, stability against temperature and enzymatic degradation and cellular response. Complex structures are achieved by combined technologies. Different drying techniques are performed with sterilisation steps and the preparation of porous structures simultaneously. Chemical crosslinking is combined with casting steps as spinning, moulding or additive manufacturing techniques. Important progress is expected by using collagen based bio-inks, which can be formed into 3D structures and combined with live cells. This review will give an overview of the technological principles of processing collagen rich tissues down to collagen hydrolysates and the methods to rebuild differently shaped products. The effects of the processing steps on the final materials properties are discussed especially with regard to the thermal and the physical properties and the susceptibility to enzymatic degradation. These properties are key features for biological and clinical application, handling and metabolization.
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Affiliation(s)
- Michael Meyer
- Research Institute for Leather and Plastic Sheeting, Meissner Ring 1-5, 09599, Freiberg, Germany.
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24
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Ashworth JC, Mehr M, Buxton PG, Best SM, Cameron RE. Optimising collagen scaffold architecture for enhanced periodontal ligament fibroblast migration. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2018; 29:166. [PMID: 30392028 PMCID: PMC6223802 DOI: 10.1007/s10856-018-6175-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 10/17/2018] [Indexed: 05/13/2023]
Abstract
Design of cell-free scaffolds for endogenous cell recruitment requires an intimate knowledge of precise relationships between structure and biological function. Here, we use morphological analysis by Micro-CT to identify the key structural features necessary for periodontal ligament fibroblast recruitment into collagen scaffolds. By the combined use of time-lapse imaging and end-point invasion analysis, we distinguish the influences of pore size, pore wall alignment, and pore transport pathways (percolation diameter) on the individual cell migration and bulk invasion characteristics of these fibroblasts. Whereas maximising percolation diameter increased individual cell speed, elongation and directionality, and produced the most rapid bulk cell invasion, a pore size of 100 μm was found to be necessary to ensure an even distribution of cells across the scaffold cross-section. These results demonstrate that control of percolation diameter and pore size may be used respectively to tune the efficiency and uniformity of invasion through macroporous scaffolds. Crucially, however, these observations were subject to the condition of pore wall alignment, with low alignment in the direction of travel producing relatively low cell speeds and limited invasion in all cases. Pore wall alignment should therefore be carefully optimised in the design of scaffolds for cell recruitment, such as that required for periodontal ligament regeneration, as a key determining factor for cell movement.
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Affiliation(s)
- Jennifer C Ashworth
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, UK.
- Stem Cell Glycobiology Group, Centre for Biomolecular Sciences, University of Nottingham, NG7 2RD, Nottingham, UK.
| | - Marco Mehr
- Geistlich Pharma AG, Core Technologies, Bahnhofstrasse 40, CH-6110, Wolhusen, Switzerland
| | - Paul G Buxton
- Geistlich Pharma AG, Core Technologies, Bahnhofstrasse 40, CH-6110, Wolhusen, Switzerland
| | - Serena M Best
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, UK
| | - Ruth E Cameron
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, UK
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25
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Grier WK, Tiffany AS, Ramsey MD, Harley BA. Incorporating β-cyclodextrin into collagen scaffolds to sequester growth factors and modulate mesenchymal stem cell activity. Acta Biomater 2018; 76:116-125. [PMID: 29944975 DOI: 10.1016/j.actbio.2018.06.033] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 06/21/2018] [Accepted: 06/22/2018] [Indexed: 12/31/2022]
Abstract
The development of biomaterials for a range of tissue engineering applications increasingly requires control over the bioavailability of biomolecular cues such as growth factors in order to promote desired cell responses. While efforts have predominantly concentrated on covalently-bound or freely-diffusible incorporation of biomolecules in porous, three-dimensional biomaterials, opportunities exist to exploit transient interactions to concentrate growth factor activity over desired time frames. Here, we report the incorporation of β-cyclodextrin into a model collagen-GAG scaffold as a means to exploit the passive sequestration and release of growth factors via guest-host interactions to control mesenchymal stem cell differentiation. Collagen-GAG scaffolds that incorporate β-cyclodextrin show improved sequestration as well as extended retention and release of TGF-β1. We further show extended retention and release of TGF-β1 and BMP-2 from β-cyclodextrin modified scaffolds was sufficient to influence the metabolic activity and proliferation of mesenchymal stem cells as well as differential activation of Smad 2/3 and Smad 1/5/8 pathways associated with differential osteo-chondral differentiation. Further, gene expression analysis showed TGF-β1 release from β-cyclodextrin CG scaffolds promoted early chondrogenic-specific differentiation. Ultimately, this work establishes a novel method for the incorporation and display of growth factors within CG scaffolds via supramolecular interactions. Such a design framework offers opportunities to selectively alter the bioavailability of multiple biomolecules within a three-dimensional collagen-GAG scaffold to enhance cell activity for a range of musculoskeletal regenerative medicine applications. STATEMENT OF SIGNIFICANCE We describe the incorporation of β-cyclodextrin into a model CG-scaffold under development for musculoskeletal tissue engineering applications. We show β-cyclodextrin modified scaffolds promote the sequestration of soluble TGF-β1 and BMP-2 via guest-host interactions, leading to extended retention and release. Further, β-cyclodextrin modified CG scaffolds promote TGF-β1 or BMP-2 specific Smad signaling pathway activation associated with divergent osseous versus chondrogenic differentiation pathways in mesenchymal stem cells.
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26
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Zhuang J, Lin S, Dong L, Cheng K, Weng W. Magnetically Assisted Electrodeposition of Aligned Collagen Coatings. ACS Biomater Sci Eng 2018; 4:1528-1535. [DOI: 10.1021/acsbiomaterials.7b01038] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Junjun Zhuang
- School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China
| | - Suya Lin
- School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China
| | - Lingqing Dong
- School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China
- The Affiliated Stomatologic Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Kui Cheng
- School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China
| | - Wenjian Weng
- School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China
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27
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Kuo S, Kim HM, Wang Z, Bingham EL, Miyazawa A, Marcelo CL, Feinberg SE. Comparison of two decellularized dermal equivalents. J Tissue Eng Regen Med 2017; 12:983-990. [DOI: 10.1002/term.2530] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Revised: 07/17/2017] [Accepted: 07/24/2017] [Indexed: 01/27/2023]
Affiliation(s)
- Shiuhyang Kuo
- Department of Oral and Maxillofacial Surgery, School of DentistryUniversity of Michigan Ann Arbor MI USA
| | - Hyungjin Myra Kim
- Consulting for Statistics, Computing & Analytics ResearchUniversity of Michigan Ann Arbor MI USA
| | - Zhifa Wang
- Department of Surgery, Medical SchoolUniversity of Michigan Ann Arbor MI USA
| | - Eve L. Bingham
- Department of Oral and Maxillofacial Surgery, School of DentistryUniversity of Michigan Ann Arbor MI USA
| | - Atsuko Miyazawa
- Department of Oral and Maxillofacial Surgery, School of DentistryUniversity of Michigan Ann Arbor MI USA
| | - Cynthia L. Marcelo
- Department of Surgery, Medical SchoolUniversity of Michigan Ann Arbor MI USA
| | - Stephen E. Feinberg
- Department of Oral and Maxillofacial Surgery, School of DentistryUniversity of Michigan Ann Arbor MI USA
- Department of Surgery, Medical SchoolUniversity of Michigan Ann Arbor MI USA
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28
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Suesca E, Dias A, Braga M, de Sousa H, Fontanilla M. Multifactor analysis on the effect of collagen concentration, cross-linking and fiber/pore orientation on chemical, microstructural, mechanical and biological properties of collagen type I scaffolds. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 77:333-341. [DOI: 10.1016/j.msec.2017.03.243] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2016] [Revised: 01/07/2017] [Accepted: 03/25/2017] [Indexed: 02/06/2023]
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29
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Abstract
Injuries to the peripheral nervous system are major sources of disability and often result in painful neuropathies or the impairment of muscle movement and/or normal sensations. For gaps smaller than 10 mm in rodents, nearly normal functional recovery can be achieved; for longer gaps, however, there are challenges that have remained insurmountable. The current clinical gold standard used to bridge long, nonhealing nerve gaps, the autologous nerve graft (autograft), has several drawbacks. Despite best efforts, engineering an alternative "nerve bridge" for peripheral nerve repair remains elusive; hence, there is a compelling need to design new approaches that match or exceed the performance of autografts across critically sized nerve gaps. Here an immunomodulatory approach to stimulating nerve repair in a nerve-guidance scaffold was used to explore the regenerative effect of reparative monocyte recruitment. Early modulation of the immune environment at the injury site via fractalkine delivery resulted in a dramatic increase in regeneration as evident from histological and electrophysiological analyses. This study suggests that biasing the infiltrating inflammatory/immune cellular milieu after injury toward a proregenerative population creates a permissive environment for repair. This approach is a shift from the current modes of clinical and laboratory methods for nerve repair, which potentially opens an alternative paradigm to stimulate endogenous peripheral nerve repair.
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30
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Zhang T, Zhang H, Zhang L, Jia S, Liu J, Xiong Z, Sun W. Biomimetic design and fabrication of multilayered osteochondral scaffolds by low-temperature deposition manufacturing and thermal-induced phase-separation techniques. Biofabrication 2017; 9:025021. [PMID: 28462906 DOI: 10.1088/1758-5090/aa7078] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Integrative osteochondral repair is a useful strategy for cartilage-defect repair. To mimic the microenvironment, it is necessary that scaffolds effectively mimic the extracellular matrix of natural cartilage and subchondral bone. In this study, biomimetic osteochondral scaffolds containing an oriented cartilage layer, a compact layer, and a three-dimensional (3D)-printed core-sheath structured-bone layer were developed. The oriented cartilage layer was designed to mimic the structural and material characteristics of native cartilage tissue and was fabricated with cartilage matrix-chitosan materials, using thermal-induced phase-separation technology. The 3D-printed core-sheath structured-bone layer was fabricated with poly(L-lactide-co-glycolide)/β-tricalcium phosphate-collagen materials by low-temperature deposition technology, using a specially designed core-sheath nozzle, and was designed to mimic the mechanical characteristics of subchondral bone and improve scaffold hydrophilicity. The compact layer was designed to mimic the calcified-layer structure of natural cartilage to ensure the presence of different suitable microenvironments for the regeneration of bone and cartilage. A dissolving-bonding process was developed to effectively combine the three parts together, after which the bone and cartilage scaffolds exhibited good mechanical properties and hydrophilicity. Additionally, goat autologous bone mesenchymal stem cells (BMSCs) were isolated and then seeded into the bone and cartilage layers, respectively, and following a 1 week culture in vitro, the BMSC-scaffold constructs were implanted into a goat articular-defect model. Our results indicated that the scaffolds exhibited good biocompatibility, and 24 weeks after implantation, the femoral condyle surface was relatively flat and consisted of a large quantity of hyaloid cartilage. Furthermore, histological staining revealed regenerated trabecular bone formed in the subchondral bone-defect area. These results provided a new method to fabricate biomimetic osteochondral scaffolds and demonstrated their effectiveness for future clinical applications in cartilage-defect repair.
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Affiliation(s)
- Ting Zhang
- Biomanufacturing Center, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China. Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing, Beijing 100084, People's Republic of China. 'Biomanufacturing and Engineering Living Systems' Innovation International Talents Base (111 Base), Beijing, 100084, People's Republic of China
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31
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Giampetruzzi L, Blasi L, Quarta A, Argentiere S, Cella C, Salvatore L, Madaghiele M, Gigli G, Sannino A. Poly(lactide-co-glycolide) nanoparticles embedded in a micropatterned collagen scaffold for neuronal tissue regeneration. INT J POLYM MATER PO 2017. [DOI: 10.1080/00914037.2016.1217533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Lucia Giampetruzzi
- Istituto Italiano di Tecnologia, Lecce, Italy
- Department of Mathematics and Physics “Ennio De Giorgi”, University of Salento, Lecce, Italy
| | - Laura Blasi
- CNR NANOTEC - Institute of Nanotechnology, University of Salento, Lecce, Italy
| | - Alessandra Quarta
- CNR NANOTEC - Institute of Nanotechnology, University of Salento, Lecce, Italy
| | | | | | - Luca Salvatore
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
| | - Marta Madaghiele
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
| | - Giuseppe Gigli
- Department of Mathematics and Physics “Ennio De Giorgi”, University of Salento, Lecce, Italy
- CNR NANOTEC - Institute of Nanotechnology, University of Salento, Lecce, Italy
| | - Alessandro Sannino
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
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32
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Zheng Z, Ran J, Chen W, Hu Y, Zhu T, Chen X, Yin Z, Heng BC, Feng G, Le H, Tang C, Huang J, Chen Y, Zhou Y, Dominique P, Shen W, Ouyang HW. Alignment of collagen fiber in knitted silk scaffold for functional massive rotator cuff repair. Acta Biomater 2017; 51:317-329. [PMID: 28093363 DOI: 10.1016/j.actbio.2017.01.041] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Revised: 01/11/2017] [Accepted: 01/12/2017] [Indexed: 12/31/2022]
Abstract
Rotator cuff tear is one of the most common types of shoulder injuries, often resulting in pain and physical debilitation. Allogeneic tendon-derived decellularized matrices do not have appropriate pore size and porosity to facilitate cell infiltration, while commercially-available synthetic scaffolds are often inadequate at inducing tenogenic differentiation. The aim of this study is to develop an advanced 3D aligned collagen/silk scaffold (ACS) and investigate its efficacy in a rabbit massive rotator cuff tear model. ACS has similar 3D alignment of collagen fibers as natural tendon with superior mechanical characteristics. Based on ectopic transplantation studies, the optimal collagen concentration (10mg/ml), pore diameter (108.43±7.25μm) and porosity (97.94±0.08%) required for sustaining a stable macro-structure conducive for cellular infiltration was determined. Within in vitro culture, tendon stem/progenitor cells (TSPCs) displayed spindle-shaped morphology, and were well-aligned on ACS as early as 24h. TSPCs formed intercellular contacts and deposited extracellular matrix after 7days. With the in vivo rotator cuff repair model, the regenerative tendon of the ACS group displayed more conspicuous native microstructures with larger diameter collagen fibrils (48.72±3.75 vs. 44.26±5.03nm) that had better alignment and mechanical properties (139.85±49.36vs. 99.09±33.98N) at 12weeks post-implantation. In conclusion, these findings demonstrate the positive efficacy of the macroporous 3D aligned scaffold in facilitating rotator cuff tendon regeneration, and its practical applications for rotator cuff tendon tissue engineering. STATEMENT OF SIGNIFICANCE Massive rotator cuff tear is one of the most common shoulder injuries, and poses a formidable clinical challenge to the orthopedic surgeon. Tissue engineering of tendon can potentially overcome the problem. However, more efficacious scaffolds with good biocompatibility, appropriate pore size, favorable inductivity and sufficient mechanical strength for repairing massive rotator cuff tendon injuries need to be developed. In this study, we developed a novel macroporous 3D aligned collagen/silk scaffold, and demonstrated that this novel scaffold enhanced the efficacy of rotator cuff tendon regeneration by inducing aligned supracellular structures similar to natural tendon, which in turn enhanced cellular infiltration and tenogenic differentiation of stem/progenitor cells from both the tendon itself and surrounding tissues. Hence, it can potentially be a clinically useful application for tendon tissue engineering.
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33
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Ran J, Xie L, Sun G, Hu J, Chen S, Jiang P, Shen X, Tong H. A facile method for the preparation of chitosan-based scaffolds with anisotropic pores for tissue engineering applications. Carbohydr Polym 2016; 152:615-623. [DOI: 10.1016/j.carbpol.2016.07.054] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Revised: 07/09/2016] [Accepted: 07/14/2016] [Indexed: 12/15/2022]
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34
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Monaco G, Cholas R, Salvatore L, Madaghiele M, Sannino A. Sterilization of collagen scaffolds designed for peripheral nerve regeneration: Effect on microstructure, degradation and cellular colonization. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 71:335-344. [PMID: 27987715 DOI: 10.1016/j.msec.2016.10.030] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 09/21/2016] [Accepted: 10/16/2016] [Indexed: 02/01/2023]
Abstract
In this study we investigated the impact of three different sterilization methods, dry heat (DHS), ethylene oxide (EtO) and electron beam radiation (β), on the properties of cylindrical collagen scaffolds with longitudinally oriented pore channels, specifically designed for peripheral nerve regeneration. Scanning electron microscopy, mechanical testing, quantification of primary amines, differential scanning calorimetry and enzymatic degradation were performed to analyze possible structural and chemical changes induced by the sterilization. Moreover, in vitro proliferation and infiltration of the rat Schwann cell line RSC96 within the scaffolds was evaluated, up to 10days of culture. No major differences in morphology and compressive stiffness were observed among scaffolds sterilized by the different methods, as all samples showed approximately the same structure and stiffness as the unsterilized control. Proliferation, infiltration, distribution and morphology of RSC96 cells within the scaffolds were also comparable throughout the duration of the cell culture study, regardless of the sterilization treatment. However, we found a slight increase of chemical crosslinking upon sterilization (EtO<DHS<β), together with an enhanced resistance to denaturation of the EtO treated scaffolds and a significantly accelerated enzymatic degradation of the β sterilized scaffolds. The results demonstrated that β irradiation impaired the scaffold properties to a greater extent, whereas EtO exposure appeared as the most suitable method for the sterilization of the proposed scaffolds.
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Affiliation(s)
- Graziana Monaco
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, Italy; Dhitech Scarl - Distretto Tecnologico High Tech, Via per Monteroni, 73100 Lecce, Italy
| | - Rahmatullah Cholas
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, Italy
| | - Luca Salvatore
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, Italy
| | - Marta Madaghiele
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, Italy.
| | - Alessandro Sannino
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, Italy
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35
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Sandri M, Filardo G, Kon E, Panseri S, Montesi M, Iafisco M, Savini E, Sprio S, Cunha C, Giavaresi G, Veronesi F, Fini M, Salvatore L, Sannino A, Marcacci M, Tampieri A. Fabrication and Pilot In Vivo Study of a Collagen-BDDGE-Elastin Core-Shell Scaffold for Tendon Regeneration. Front Bioeng Biotechnol 2016; 4:52. [PMID: 27446909 PMCID: PMC4923187 DOI: 10.3389/fbioe.2016.00052] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Accepted: 06/03/2016] [Indexed: 11/13/2022] Open
Abstract
The development of bio-devices for complete regeneration of ligament and tendon tissues is presently one of the biggest challenges in tissue engineering. Such device must simultaneously possess optimal mechanical performance, suitable porous structure, and biocompatible microenvironment. This study proposes a novel collagen-BDDGE-elastin (CBE)-based device for tendon tissue engineering, by the combination of two different modules: (i) a load-bearing, non-porous, “core scaffold” developed by braiding CBE membranes fabricated via an evaporative process and (ii) a hollow, highly porous, “shell scaffold” obtained by uniaxial freezing followed by freeze-drying of CBE suspension, designed to function as a physical guide and reservoir of cells to promote the regenerative process. Both core and shell materials demonstrated good cytocompatibility in vitro, and notably, the porous shell architecture directed cell alignment and population within the sample. Finally, a prototype of the core module was implanted in a rat tendon lesion model, and histological analysis demonstrated its safety, biocompatibility, and ability to induce tendon regeneration. Overall, our results indicate that such device may have the potential to support and induce in situ tendon regeneration.
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Affiliation(s)
- Monica Sandri
- Institute of Science and Technology for Ceramics, National Research Council , Faenza , Italy
| | - Giuseppe Filardo
- Biomechanics and Technology Innovation Laboratory, Rizzoli Orthopaedic Institute, II Orthopaedic and Traumatologic Clinic, Bologna, Italy; Nano-Biotechnology Laboratory, Rizzoli Orthopaedic Institute, II Orthopaedic and Traumatologic Clinic, Bologna, Italy
| | - Elizaveta Kon
- Biomechanics and Technology Innovation Laboratory, Rizzoli Orthopaedic Institute, II Orthopaedic and Traumatologic Clinic, Bologna, Italy; Nano-Biotechnology Laboratory, Rizzoli Orthopaedic Institute, II Orthopaedic and Traumatologic Clinic, Bologna, Italy
| | - Silvia Panseri
- Institute of Science and Technology for Ceramics, National Research Council , Faenza , Italy
| | - Monica Montesi
- Institute of Science and Technology for Ceramics, National Research Council , Faenza , Italy
| | - Michele Iafisco
- Institute of Science and Technology for Ceramics, National Research Council , Faenza , Italy
| | - Elisa Savini
- Institute of Science and Technology for Ceramics, National Research Council , Faenza , Italy
| | - Simone Sprio
- Institute of Science and Technology for Ceramics, National Research Council , Faenza , Italy
| | - Carla Cunha
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto , Porto , Portugal
| | - Gianluca Giavaresi
- Laboratory of Preclinical and Surgical Studies, Rizzoli Orthopaedic Institute, Bologna, Italy; Laboratory of Biocompatibility, Technological Innovations and Advanced Therapies, Department RIT Rizzoli-Rizzoli Orthopaedic Institute, Bologna, Italy
| | - Francesca Veronesi
- Laboratory of Preclinical and Surgical Studies, Rizzoli Orthopaedic Institute , Bologna , Italy
| | - Milena Fini
- Laboratory of Preclinical and Surgical Studies, Rizzoli Orthopaedic Institute, Bologna, Italy; Laboratory of Biocompatibility, Technological Innovations and Advanced Therapies, Department RIT Rizzoli-Rizzoli Orthopaedic Institute, Bologna, Italy
| | - Luca Salvatore
- Department of Engineering for Innovation, University of Salento , Lecce , Italy
| | - Alessandro Sannino
- Department of Engineering for Innovation, University of Salento , Lecce , Italy
| | - Maurilio Marcacci
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto , Porto , Portugal
| | - Anna Tampieri
- Institute of Science and Technology for Ceramics, National Research Council , Faenza , Italy
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Snider S, Cavalli A, Colombo F, Gallotti AL, Quattrini A, Salvatore L, Madaghiele M, Terreni MR, Sannino A, Mortini P. A novel composite type I collagen scaffold with micropatterned porosity regulates the entrance of phagocytes in a severe model of spinal cord injury. J Biomed Mater Res B Appl Biomater 2016; 105:1040-1053. [PMID: 26958814 DOI: 10.1002/jbm.b.33645] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 01/29/2016] [Accepted: 02/12/2016] [Indexed: 01/28/2023]
Abstract
Traumatic spinal cord injury (SCI) is a damage to the spinal cord that results in loss or impaired motor and/or sensory function. SCI is a sudden and unexpected event characterized by high morbidity and mortality rate during both acute and chronic stages, and it can be devastating in human, social and economical terms. Despite significant progresses in the clinical management of SCI, there remain no effective treatments to improve neurological outcomes. Among experimental strategies, bioengineered scaffolds have the potential to support and guide injured axons contributing to neural repair. The major aim of this study was to investigate a novel composite type I collagen scaffold with micropatterned porosity in a rodent model of severe spinal cord injury. After segment resection of the thoracic spinal cord we implanted the scaffold in female Sprague-Dawley rats. Controls were injured without receiving implantation. Behavioral analysis of the locomotor performance was monitored up to 55 days postinjury. Two months after injury histopathological analysis were performed to evaluate the extent of scar and demyelination, the presence of connective tissue and axonal regrowth through the scaffold and to evaluate inflammatory cell infiltration at the injured site. We provided evidence that the new collagen scaffold was well integrated with the host tissue, slightly ameliorated locomotor function, and limited the robust recruitment of the inflammatory cells at the injury site during both the acute and chronic stage in spinal cord injured rats. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 1040-1053, 2017.
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Affiliation(s)
- Silvia Snider
- Division of Neurosurgery, San Raffaele Scientific Institute, Via Olgettina 60, 20132, Milan, Italy
| | - Andrea Cavalli
- Division of Neurosurgery, San Raffaele Scientific Institute, Via Olgettina 60, 20132, Milan, Italy
| | - Francesca Colombo
- Division of Neurosurgery, San Raffaele Scientific Institute, Via Olgettina 60, 20132, Milan, Italy
| | - Alberto Luigi Gallotti
- Division of Neurosurgery, San Raffaele Scientific Institute, Via Olgettina 60, 20132, Milan, Italy
| | - Angelo Quattrini
- Division of Neuroscience and INSPE, San Raffaele Scientific Institute, via Olgettina 60, 20132, Milan, Italy
| | - Luca Salvatore
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100, Lecce, Italy
| | - Marta Madaghiele
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100, Lecce, Italy
| | - Maria Rosa Terreni
- Division of Pathology, San Raffaele Scientific Institute, Via Olgettina 60, 20132, Milan, Italy
| | - Alessandro Sannino
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100, Lecce, Italy
| | - Pietro Mortini
- Division of Neurosurgery, San Raffaele Scientific Institute, Via Olgettina 60, 20132, Milan, Italy
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Rowland CR, Colucci LA, Guilak F. Fabrication of anatomically-shaped cartilage constructs using decellularized cartilage-derived matrix scaffolds. Biomaterials 2016; 91:57-72. [PMID: 26999455 DOI: 10.1016/j.biomaterials.2016.03.012] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Revised: 03/02/2016] [Accepted: 03/06/2016] [Indexed: 12/29/2022]
Abstract
The native extracellular matrix of cartilage contains entrapped growth factors as well as tissue-specific epitopes for cell-matrix interactions, which make it a potentially attractive biomaterial for cartilage tissue engineering. A limitation to this approach is that the native cartilage extracellular matrix possesses a pore size of only a few nanometers, which inhibits cellular infiltration. Efforts to increase the pore size of cartilage-derived matrix (CDM) scaffolds dramatically attenuate their mechanical properties, which makes them susceptible to cell-mediated contraction. In previous studies, we have demonstrated that collagen crosslinking techniques are capable of preventing cell-mediated contraction in CDM disks. In the current study, we investigated the effects of CDM concentration and pore architecture on the ability of CDM scaffolds to resist cell-mediated contraction. Increasing CDM concentration significantly increased scaffold mechanical properties, which played an important role in preventing contraction, and only the highest CDM concentration (11% w/w) was able to retain the original scaffold dimensions. However, the increase in CDM concentration led to a concomitant decrease in porosity and pore size. Generating a temperature gradient during the freezing process resulted in unidirectional freezing, which aligned the formation of ice crystals during the freezing process and in turn produced aligned pores in CDM scaffolds. These aligned pores increased the pore size of CDM scaffolds at all CDM concentrations, and greatly facilitated infiltration by mesenchymal stem cells (MSCs). These methods were used to fabricate of anatomically-relevant CDM hemispheres. CDM hemispheres with aligned pores supported uniform MSC infiltration and matrix deposition. Furthermore, these CDM hemispheres retained their original architecture and did not contract, warp, curl, or splay throughout the entire 28-day culture period. These findings demonstrate that given the appropriate fabrication parameters, CDM scaffolds are capable of maintaining complex structures that support MSC chondrogenesis.
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Affiliation(s)
- Christopher R Rowland
- Department of Orthopaedic Surgery, Washington University, St. Louis, MO, 63110, United States; Department of Developmental Biology, Washington University, St. Louis, MO, 63110, United States; Department of Biomedical Engineering, Washington University, St. Louis, MO, 63110, United States; Shriners Hospitals for Children - St. Louis Hospital, 3210 McKinley Research Building, St. Louis, MO, 63110, United States
| | - Lina A Colucci
- Department of Orthopaedic Surgery, Washington University, St. Louis, MO, 63110, United States; Department of Developmental Biology, Washington University, St. Louis, MO, 63110, United States; Department of Biomedical Engineering, Washington University, St. Louis, MO, 63110, United States; Shriners Hospitals for Children - St. Louis Hospital, 3210 McKinley Research Building, St. Louis, MO, 63110, United States
| | - Farshid Guilak
- Department of Orthopaedic Surgery, Washington University, St. Louis, MO, 63110, United States; Department of Developmental Biology, Washington University, St. Louis, MO, 63110, United States; Department of Biomedical Engineering, Washington University, St. Louis, MO, 63110, United States; Shriners Hospitals for Children - St. Louis Hospital, 3210 McKinley Research Building, St. Louis, MO, 63110, United States.
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Cell structure, stiffness and permeability of freeze-dried collagen scaffolds in dry and hydrated states. Acta Biomater 2016; 33:166-175. [PMID: 26827778 DOI: 10.1016/j.actbio.2016.01.041] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 12/22/2015] [Accepted: 01/27/2016] [Indexed: 02/03/2023]
Abstract
Scaffolds for tissue engineering applications should be highly permeable to support mass transfer requirements while providing a 3-D template for the encapsulated biological cells. High porosity and cell interconnectivity result in highly compliant scaffolds. Overstraining occurs easily with such compliant materials and can produce misleading results. In this paper, the cell structure of freeze-dried collagen scaffolds, in both dry and hydrated states, was characterised using X-ray tomography and 2-photon confocal microscopy respectively. Measurements have been made of the scaffold's Young's modulus using conventional mechanical testing and a customised see-saw testing configuration. Specific permeability was measured under constant pressure gradient and compared with predictions. The collagen scaffolds investigated here have a coarse cell size (∼100-150 μm) and extensive connectivity between adjacent cells (∼10-30 μm) in both dry and hydrated states. The Young's modulus is very low, of the order of 10 kPa when dry and 1 kPa when hydrated. There is only a single previous study concerning the specific permeability of (hydrated) collagen scaffolds, despite its importance in nutrient diffusion, waste removal and cell migration. The experimentally measured value reported here (5 × 10(-)(10)m(2)) is in good agreement with predictions based on Computational Fluid Dynamics simulation and broadly consistent with the Carman-Kozeny empirical estimate. It is however about three orders of magnitude higher than the single previously-reported value and this discrepancy is attributed at least partly to the high pressure gradient imposed in the previous study. STATEMENT OF SIGNIFICANCE The high porosity and interconnectivity of tissue engineering scaffolds result in highly compliant structures (ie large deflections under low applied loads). Characterisation is essential if these scaffolds are to be systematically optimised. Scaffold overstraining during characterisation can lead to misleading results. In this study, the stiffness (in dry and hydrated states) and specific permeability of freeze-dried collagen scaffolds have been measured using techniques customised for low stiffness structures. The scaffold cell structure is investigated using X-ray computed tomography, which has been applied previously to visualise such materials, without extracting any structural parameters or simulating fluid flow. These are carried out in this work. 2-photon confocal microscopy is used for the first time to study the structure in hydrated state.
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Lowe CJ, Reucroft IM, Grota MC, Shreiber DI. Production of Highly Aligned Collagen Scaffolds by Freeze-drying of Self-assembled, Fibrillar Collagen Gels. ACS Biomater Sci Eng 2016; 2:643-651. [PMID: 27430016 DOI: 10.1021/acsbiomaterials.6b00036] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Matrix and cellular alignment are critical factors in the native function of many tissues, including muscle, nerve, and ligaments. Collagen is frequently a component of these aligned tissues, and collagen biomaterials are widely used in tissue engineering applications. However, the generation of aligned collagen scaffolds that maintain the native architecture of collagen fibrils has not been straightforward, with many methods requiring specialized equipment or technical procedures, extensive incubation times, or denaturing of the collagen. Herein, we present a simple, rapid method for fabrication of highly aligned collagen scaffolds. Collagen was assembled to form a fibrillar hydrogel in a cylindrical conduit with high aspect ratio and then frozen and lyophilized. The resulting collagen scaffolds demonstrated highly aligned topographical features along the scaffold surface. This presence of an initial fibrillar network and the high-aspect ratio vessel were both required to generate alignment. The diameter of fabricated scaffolds was found to vary significantly with both the collagen concentration of the hydrogel suspension and the diameter of conduits used for fabrication. Additionally, the size of individual aligned topographical features was significantly dependent on the conduit diameter and the freezing temperature. When cultured on aligned collagen scaffolds, both rat dermal fibroblasts and axons emerging from chick dorsal root ganglia explants demonstrated elongated, aligned morphology and growth on the aligned topographical features. Overall, this method presents a simple means for generating aligned collagen scaffolds that can be applied to a wide variety of tissue types, particularly those where such alignment is critical to native function.
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Affiliation(s)
- Christopher J Lowe
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, 599 Taylor Road, Piscataway, New Jersey 08854, United States
| | - Ian M Reucroft
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, 599 Taylor Road, Piscataway, New Jersey 08854, United States
| | - Matthew C Grota
- Department of Bioengineering, University of Massachusetts Dartmouth, 285 Old Westport Road, Dartmouth, Massachusetts 02747, United States
| | - David I Shreiber
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, 599 Taylor Road, Piscataway, New Jersey 08854, United States
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Bhutto MA, Zhang J, Sun B, El-Hamshary H, Al-Deyab SS, Mo X. Development of poly (L-lactide-co-caprolactone) multichannel nerve conduit with aligned electrospun nanofibers for Schwann cell proliferation. INT J POLYM MATER PO 2016. [DOI: 10.1080/00914037.2015.1099104] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Pires LR, Pêgo AP. Bridging the lesion-engineering a permissive substrate for nerve regeneration. Regen Biomater 2015; 2:203-14. [PMID: 26816642 PMCID: PMC4669012 DOI: 10.1093/rb/rbv012] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Revised: 07/21/2015] [Accepted: 06/30/2015] [Indexed: 01/30/2023] Open
Abstract
Biomaterial-based strategies to restore connectivity after lesion at the spinal cord are focused on bridging the lesion and providing an favourable substrate and a path for axonal re-growth. Following spinal cord injury (SCI) a hostile environment for neuronal cell growth is established by the activation of multiple inhibitory mechanisms that hamper regeneration to occur. Implantable scaffolds can provide mechanical support and physical guidance for axon re-growth and, at the same time, contribute to alleviate the hostile environment by the in situ delivery of therapeutic molecules and/or relevant cells. Basic research on SCI has been contributing with the description of inhibitory mechanisms for regeneration as well as identifying drugs/molecules that can target inhibition. This knowledge is the background for the development of combined strategies with biomaterials. Additionally, scaffold design is significantly evolving. From the early simple hollow conduits, scaffolds with complex architectures that can modulate cell fate are currently being tested. A number of promising pre-clinical studies combining scaffolds, cells, drugs and/or nucleic acids are reported in the open literature. Overall, it is considered that to address the multi-factorial inhibitory environment of a SCI, a multifaceted therapeutic approach is imperative. The progress in the identification of molecules that target inhibition after SCI and its combination with scaffolds and/or cells are described and discussed in this review.
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Affiliation(s)
- Liliana R. Pires
- INEB—Instituto de Engenharia Biomédica, Universidade do Porto, Rua do Campo Alegre 823, 4150-180 Porto, Portugal
- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal
- Faculdade de Engenharia—Universidade do Porto (FEUP), Porto, Portugal and
| | - Ana P. Pêgo
- INEB—Instituto de Engenharia Biomédica, Universidade do Porto, Rua do Campo Alegre 823, 4150-180 Porto, Portugal
- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal
- Faculdade de Engenharia—Universidade do Porto (FEUP), Porto, Portugal and
- Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto, Porto, Portugal
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Nakaegawa Y, Nakamura R, Tada Y, Nomoto Y, Imaizumi M, Suzuki R, Nakamura T, Omori K. Effect of Structural Differences in Collagen Sponge Scaffolds on Tracheal Epithelium Regeneration. Ann Otol Rhinol Laryngol 2015; 125:115-22. [PMID: 26276144 DOI: 10.1177/0003489415599991] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
OBJECTIVE We developed an in situ regeneration-inducible artificial trachea composed of a porcine collagen sponge and polypropylene framework and used it for tracheal reconstruction. In the present study, collagen sponges with different structures were prepared from various concentrations of collagen solutions, and their effect on the regeneration of tracheal epithelium was examined. METHODS Collagen sponges were prepared from type I and III collagen solutions. The structures of the sponges were analyzed using scanning electron microscopy (SEM). Artificial tracheae, which were formed using the collagen sponges with different structures, were implanted into rabbits, and regeneration of the tracheal epithelium on the artificial tracheae was evaluated by SEM analysis and histological examination. RESULTS The SEM analysis showed that collagen sponges prepared from 0.5% and 1.0% collagen solutions had a porous structure. However, the sponges prepared from a 1.5% collagen solution had a nonporous structure. After implantation of artificial tracheae prepared from 0.5% and 1.0% collagen solutions, their luminal surfaces were mostly covered with epithelium within 14 days. However, epithelial reorganization occurred later on artificial tracheae prepared from the 1.5% collagen solution. CONCLUSION Collagen sponges with a porous structure are suitable for regeneration of the tracheal epithelium in our artificial trachea.
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Affiliation(s)
- Yuta Nakaegawa
- Department of Otolaryngology, Fukushima Medical University, Fukushima, Japan
| | - Ryosuke Nakamura
- Department of Otolaryngology, Fukushima Medical University, Fukushima, Japan
| | - Yasuhiro Tada
- Department of Otolaryngology, Fukushima Medical University, Fukushima, Japan
| | - Yukio Nomoto
- Department of Otolaryngology, Fukushima Medical University, Fukushima, Japan
| | - Mitsuyoshi Imaizumi
- Department of Otolaryngology, Fukushima Medical University, Fukushima, Japan
| | - Ryo Suzuki
- Department of Otolaryngology, Fukushima Medical University, Fukushima, Japan
| | - Tatsuo Nakamura
- Department of Bioartificial Organs, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Koichi Omori
- Department of Otolaryngology, Fukushima Medical University, Fukushima, Japan
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Lai JY. Influence of Pre-Freezing Temperature on the Corneal Endothelial Cytocompatibility and Cell Delivery Performance of Porous Hyaluronic Acid Hydrogel Carriers. Int J Mol Sci 2015; 16:18796-811. [PMID: 26270663 PMCID: PMC4581272 DOI: 10.3390/ijms160818796] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2015] [Revised: 07/21/2015] [Accepted: 07/31/2015] [Indexed: 11/26/2022] Open
Abstract
The development of porous hyaluronic acid (HA) hydrogels for corneal endothelial tissue engineering is attractive because they can be used as functional cell delivery carriers to help in the reconstruction of damaged areas. The purpose of this study was to investigate the corneal endothelial cytocompatibility and cell delivery performance of porous HA hydrogel biomaterials fabricated at different pre-freezing temperatures. As compared to their counterparts prepared at −80 °C, the HA samples fabricated at higher pre-freezing temperature (i.e., 0 °C) exhibited a larger pore size and higher porosity, thereby leading to lower resistance to glucose permeation. Live/dead assays and gene expression analyses showed that the restricted porous structure of HA carriers decreases the viability and ionic pump function of cultured corneal endothelial cells (CECs). The results also indicated that the porous hydrogel biomaterials fabricated at high pre-freezing temperature seem to be more compatible with rabbit CECs. In an animal model of corneal endothelial dysfunction, the wounded rabbit corneas receiving bioengineered CEC sheets and restricted porous-structured HA carriers demonstrated poor tissue reconstruction. The therapeutic efficacy of cell sheet transplants can be improved by using carrier materials prepared at high pre-freezing temperature. Our findings suggest that the cryogenic operation temperature-mediated pore microstructure of HA carriers plays an important role in corneal endothelial cytocompatibility and cell delivery performance.
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Affiliation(s)
- Jui-Yang Lai
- Institute of Biochemical and Biomedical Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
- Biomedical Engineering Research Center, Chang Gung University, Taoyuan 33302, Taiwan.
- Molecular Medicine Research Center, Chang Gung University, Taoyuan 33302, Taiwan.
- Center for Tissue Engineering, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan .
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Parmar N, Kumar L, Emmanuel A, Day RM. Prospective regenerative medicine therapies for obstetric trauma-induced fecal incontinence. Regen Med 2015; 9:831-40. [PMID: 25431918 DOI: 10.2217/rme.14.56] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Fecal incontinence is a major public health issue that has yet to be adequately addressed. Obstetric trauma and injury to the anal sphincter muscles are the most common cause of fecal incontinence. New therapies are emerging aimed at repair or regeneration of sphincter muscle and restoration of continence. While regenerative medicine offers an attractive option for fecal incontinence there are currently no validated techniques using this approach. Although many challenges are yet to be resolved, the advent of regenerative medicine is likely to offer disruptive technologies to treat and possibly prevent the onset of this devastating condition. This article provides a review on regenerative medicine approaches for treating fecal incontinence and a critique of the current landscape in this area.
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Affiliation(s)
- Nina Parmar
- Applied Biomedical Engineering Group, University College London, 21 University Street, London, WC1E 6JJ, UK
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Pot MW, Faraj KA, Adawy A, van Enckevort WJP, van Moerkerk HTB, Vlieg E, Daamen WF, van Kuppevelt TH. Versatile wedge-based system for the construction of unidirectional collagen scaffolds by directional freezing: practical and theoretical considerations. ACS APPLIED MATERIALS & INTERFACES 2015; 7:8495-505. [PMID: 25822583 DOI: 10.1021/acsami.5b00169] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Aligned unidirectional collagen scaffolds may aid regeneration of those tissues where alignment of cells and extracellular matrix is essential, as for instance in cartilage, nerve bundles, and skeletal muscle. Pores can be introduced by ice crystal formation followed by freeze-drying, the pore architecture reflecting the ice crystal morphology. In this study we developed a wedge-based system allowing the production of a wide range of collagen scaffolds with unidirectional pores by directional freezing. Insoluble type I collagen suspensions were frozen using a custom-made wedge system, facilitating the formation of a horizontal as well as a vertical temperature gradient and providing a controlled solidification area for ice dendrites. The system permitted the growth of aligned unidirectional ice crystals over a large distance (>2.5 cm), an insulator prolonging the freezing process and facilitating the construction of crack-free scaffolds. Unidirectional collagen scaffolds with tunable pore sizes and pore morphologies were constructed by varying freezing rates and suspension media. The versatility of the system was indicated by the construction of unidirectional scaffolds from albumin, poly(vinyl alcohol) (a synthetic polymer), and collagen-polymer blends producing hybrid scaffolds. Macroscopic observations, temperature measurements, and scanning electron microscopy indicated that directed horizontal ice dendrite formation, vertical ice crystal nucleation, and evolutionary selection were the basis of the aligned unidirectional ice crystal growth and, hence, the aligned unidirectional pore structure. In conclusion, a simple, highly adjustable freezing system has been developed allowing the construction of large (hybrid) bioscaffolds with tunable unidirectional pore architecture.
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Affiliation(s)
- Michiel W Pot
- †Department of Biochemistry 280, Radboud Institute for Molecular Life Sciences, Radboud university medical center, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands
| | - Kaeuis A Faraj
- †Department of Biochemistry 280, Radboud Institute for Molecular Life Sciences, Radboud university medical center, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands
| | - Alaa Adawy
- ‡Department of Solid State Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, 6525 AJ Nijmegen, The Netherlands
| | - Willem J P van Enckevort
- ‡Department of Solid State Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, 6525 AJ Nijmegen, The Netherlands
| | - Herman T B van Moerkerk
- †Department of Biochemistry 280, Radboud Institute for Molecular Life Sciences, Radboud university medical center, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands
| | - Elias Vlieg
- ‡Department of Solid State Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, 6525 AJ Nijmegen, The Netherlands
| | - Willeke F Daamen
- †Department of Biochemistry 280, Radboud Institute for Molecular Life Sciences, Radboud university medical center, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands
| | - Toin H van Kuppevelt
- †Department of Biochemistry 280, Radboud Institute for Molecular Life Sciences, Radboud university medical center, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands
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Ghaleh H, Abbasi F, Alizadeh M, Khoshfetrat AB. Mimicking the quasi-random assembly of protein fibers in the dermis by freeze-drying method. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 49:807-815. [DOI: 10.1016/j.msec.2015.01.071] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Revised: 12/22/2014] [Accepted: 01/23/2015] [Indexed: 11/28/2022]
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Wu YC, Lin WY, Yang CY, Lee TM. Fabrication of gelatin-strontium substituted calcium phosphate scaffolds with unidirectional pores for bone tissue engineering. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2015; 26:152. [PMID: 25773230 DOI: 10.1007/s10856-015-5490-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Accepted: 02/08/2015] [Indexed: 05/15/2023]
Abstract
This study fabricated homogeneous gelatin-strontium substituted calcium phosphate composites via coprecipitation in a gelatin solution. Unidirectional porous scaffolds with an oriented microtubular structure were then manufactured using freeze-drying technology. The resulting structure and pore alignment were determined using scanning electron microscopy. The pore size were in the range of 200-400 μm, which is considered ideal for the engineering of bone tissue. The scaffolds were further characterized using energy dispersive spectroscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. Hydroxyapatite was the main calcium phosphate compound in the scaffolds, with strontium incorporated into the crystal structure. The porosity of the scaffolds decreased with increasing concentration of calcium-phosphate. The compressive strength in the longitudinal direction was two to threefold higher than that observed in the transverse direction. Our results demonstrate that the composite scaffolds degraded by approximately 20 % after 5 weeks. Additionally, in vitro results reveal that the addition of strontium significantly increased human osteoblastic cells proliferation. Scaffolds containing strontium with a Sr-CaP/(gelatin + Sr-CaP) ratio of 50 % provided the most suitable environment for cell proliferation, particularly under dynamic culture conditions. This study demonstrates the considerable potential of composite scaffolds composed of gelatin-strontium-substituted calcium phosphate for applications in bone tissue engineering.
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Affiliation(s)
- Yu-Chun Wu
- National Laboratory Animal Center, National Applied Research Laboratories, Tainan, Taiwan
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Kinikoglu B, Damour O, Hasirci V. Tissue engineering of oral mucosa: a shared concept with skin. J Artif Organs 2014; 18:8-19. [PMID: 25326194 DOI: 10.1007/s10047-014-0798-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Accepted: 10/07/2014] [Indexed: 12/17/2022]
Abstract
Tissue-engineered oral mucosa, in the form of epithelial cell sheets or full-thickness oral mucosa equivalents, is a potential solution for many patients with congenital defects or with tissue loss due to diseases or tumor excision following a craniofacial cancer diagnosis. In the laboratory, it further serves as an in vitro model, alternative to in vivo testing of oral care products, and provides insight into the behavior of the oral mucosal cells in healthy and pathological tissues. This review covers the old and new generation scaffold types and materials used in oral mucosa engineering; discusses similarities and differences between oral mucosa and skin, the methods developed to reconstruct oral mucosal defects; and ends with future perspectives on oral mucosa engineering.
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Affiliation(s)
- Beste Kinikoglu
- Department of Medical Biology, School of Medicine, Acibadem University, 34742, Istanbul, Turkey,
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49
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Liang X, Cai H, Hao Y, Sun G, Song Y, Chen W. Sciatic nerve repair using adhesive bonding and a modified conduit. Neural Regen Res 2014; 9:594-601. [PMID: 25206861 PMCID: PMC4146232 DOI: 10.4103/1673-5374.130099] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/22/2014] [Indexed: 11/05/2022] Open
Abstract
When repairing nerves with adhesives, most researchers place glue directly on the nerve stumps, but this method does not fix the nerve ends well and allows glue to easily invade the nerve ends. In this study, we established a rat model of completely transected sciatic nerve injury and repaired it using a modified 1 cm-length conduit with inner diameter of 1.5 mm. Each end of the cylindrical conduit contains a short linear channel, while the enclosed central tube protects the nerve ends well. Nerves were repaired with 2-octyl-cyanoacrylate and suture, which complement the function of the modified conduit. The results demonstrated that for the same conduit, the average operation time using the adhesive method was much shorter than with the suture method. No significant differences were found between the two groups in sciatic function index, motor evoked potential latency, motor evoked potential amplitude, muscular recovery rate, number of medullated nerve fibers, axon diameter, or medullary sheath thickness. Thus, the adhesive method for repairing nerves using a modified conduit is feasible and effective, and reduces the operation time while providing an equivalent repair effect.
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Affiliation(s)
- Xiangdang Liang
- Department of Orthopedics, General Hospital of Chinese PLA, Beijing, China
| | - Hongfei Cai
- Department of Orthopedics, General Hospital of Chinese PLA, Beijing, China
| | - Yongyu Hao
- Wei Zikeng Clinic of General Armament Department of Chinese PLA, Beijing, China
| | - Geng Sun
- Department of Orthopedics, 252 Hospital of Chinese PLA, Hebei Province, China
| | - Yaoyao Song
- Department of Orthopedics, General Hospital of Chinese PLA, Beijing, China
| | - Wen Chen
- Department of Orthopedics, General Hospital of Chinese PLA, Beijing, China
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50
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Zhou J, Sui F, Yao M, Wang Y, Liu Y, Tian F, Li Q, He X, Shao L, Liu Z. Novel nanometer scaffolds regulate the biological behaviors of neural stem cells. Neural Regen Res 2014; 8:1455-64. [PMID: 25206441 PMCID: PMC4107811 DOI: 10.3969/j.issn.1673-5374.2013.16.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Accepted: 05/06/2013] [Indexed: 11/18/2022] Open
Abstract
Ideal tissue-engineered scaffold materials regulate proliferation, apoptosis and differentiation of cells seeded on them by regulating gene expression. In this study, aligned and randomly oriented collagen nanofiber scaffolds were prepared using electronic spinning technology. Their diameters and appearance reached the standards of tissue-engineered nanometer scaffolds. The nanofiber scaffolds were characterized by a high swelling ratio, high porosity and good mechanical properties. The proliferation of spinal cord-derived neural stem cells on novel nanofiber scaffolds was obviously enhanced. The proportions of cells in the S and G2/M phases noticeably increased. Moreover, the proliferation rate of neural stem cells on the aligned collagen nanofiber scaffolds was high. The expression levels of cyclin D1 and cyclin-dependent kinase 2 were increased. Bcl-2 expression was significantly increased, but Bax and caspase-3 gene expressions were obviously decreased. There was no significant difference in the differentiation of neural stem cells into neurons on aligned and randomly oriented collagen nanofiber scaffolds. These results indicate that novel nanofiber scaffolds could promote the proliferation of spinal cord-derived neural stem cells and inhibit apoptosis without inducing differentiation. Nanofiber scaffolds regulate apoptosis and proliferation in neural stem cells by altering gene expression.
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Affiliation(s)
- Jihui Zhou
- Longnan Hospital of Daqing, i.e. the Fifth Hospital Affiliated to Qiqihar Medical University, Daqing 163453, Heilongjiang Province, China
| | - Fuge Sui
- Longnan Hospital of Daqing, i.e. the Fifth Hospital Affiliated to Qiqihar Medical University, Daqing 163453, Heilongjiang Province, China
| | - Meng Yao
- Department of Spine Surgery, the Second Hospital Affiliated to Harbin Medical University, Harbin 150086, Heilongjiang Province, China
| | - Yansong Wang
- Department of Spine Surgery, the Second Hospital Affiliated to Harbin Medical University, Harbin 150086, Heilongjiang Province, China
| | - Yugang Liu
- Department of Spine Surgery, the Second Hospital Affiliated to Harbin Medical University, Harbin 150086, Heilongjiang Province, China
| | - Feipeng Tian
- Longnan Hospital of Daqing, i.e. the Fifth Hospital Affiliated to Qiqihar Medical University, Daqing 163453, Heilongjiang Province, China
| | - Qiang Li
- Longnan Hospital of Daqing, i.e. the Fifth Hospital Affiliated to Qiqihar Medical University, Daqing 163453, Heilongjiang Province, China
| | - Xiaofeng He
- Longnan Hospital of Daqing, i.e. the Fifth Hospital Affiliated to Qiqihar Medical University, Daqing 163453, Heilongjiang Province, China
| | - Lin Shao
- Longnan Hospital of Daqing, i.e. the Fifth Hospital Affiliated to Qiqihar Medical University, Daqing 163453, Heilongjiang Province, China
| | - Zhiqiang Liu
- Longnan Hospital of Daqing, i.e. the Fifth Hospital Affiliated to Qiqihar Medical University, Daqing 163453, Heilongjiang Province, China
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