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Li X, Mao X, Tao M, Liang F, Tian X, Fan J, Wang X, Yu T, Ao Q. Enhancing neuroinduction activity of PLCL-based nerve conduits through native epineurium integration. Biomater Adv 2024; 159:213803. [PMID: 38447384 DOI: 10.1016/j.bioadv.2024.213803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 01/23/2024] [Accepted: 02/20/2024] [Indexed: 03/08/2024]
Abstract
Autologous nerve grafts have been considered the gold standard for peripheral nerve grafts. However, due to drawbacks such as functional loss in the donor area and a shortage of donor sources, nerve conduits are increasingly being considered as an alternative approach. Polymer materials have been widely studied as nerve repair materials due to their excellent processing performance. However, their limited biocompatibility has restricted further clinical applications. The epineurium is a natural extra-neural wrapping structure. After undergoing decellularization, the epineurium not only reduces immune rejection but also retains certain bioactive components. In this study, decellularized epineurium (DEP) derived from the sciatic nerve of mammals was prepared, and a bilayer nerve conduit was created by electrospinning a poly (l-lactide-co-ε-caprolactone) (PLCL) membrane layer onto the outer surface of the DEP. Components of the DEP were examined; the physical properties and biosafety of the bilayer nerve conduit were evaluated; and the functionality of the nerve conduit was evaluated in rats. The results demonstrate that the developed bilayer nerve conduit exhibits excellent biocompatibility and mechanical properties. Furthermore, this bilayer nerve conduit shows significantly superior therapeutic effects for sciatic nerve defects in rats compared to the pure PLCL nerve conduit. In conclusion, this research provides a novel strategy for the design of nerve regeneration materials and holds promising potential for further clinical translation.
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Affiliation(s)
- Xiao Li
- Department of Tissue Engineering, School of Intelligent Medicine, China Medical University, Shenyang, Liaoning, China
| | - Xiaoyan Mao
- Department of Tissue Engineering, School of Intelligent Medicine, China Medical University, Shenyang, Liaoning, China
| | - Meihan Tao
- Department of Tissue Engineering, School of Intelligent Medicine, China Medical University, Shenyang, Liaoning, China
| | - Fang Liang
- Department of Tissue Engineering, School of Intelligent Medicine, China Medical University, Shenyang, Liaoning, China
| | - Xiaohong Tian
- Department of Tissue Engineering, School of Intelligent Medicine, China Medical University, Shenyang, Liaoning, China
| | - Jun Fan
- Department of Tissue Engineering, School of Intelligent Medicine, China Medical University, Shenyang, Liaoning, China
| | - Xiaohong Wang
- Department of Tissue Engineering, School of Intelligent Medicine, China Medical University, Shenyang, Liaoning, China
| | - Tianhao Yu
- The VIP Department, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Diseases, Shenyang, China
| | - Qiang Ao
- Department of Tissue Engineering, School of Intelligent Medicine, China Medical University, Shenyang, Liaoning, China; NMPA Key Laboratory for Quality Research and Control of Tissue Regenerative Biomaterial, Institute of Regulatory Science for Medical Device, National Engineering Research Center for Biomaterials, Sichuan University, Chengdu, Sichuan 610064, China..
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2
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Dong X, Zhang H, Duan P, Liu K, Yu Y, Wei W, Wang W, Liu Y, Cheng Q, Liang X, Huo Y, Yan L, Yu A, Dai H. An injectable and adaptable hydrogen sulfide delivery system for modulating neuroregenerative microenvironment. Sci Adv 2023; 9:eadi1078. [PMID: 38117891 PMCID: PMC10732521 DOI: 10.1126/sciadv.adi1078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 11/17/2023] [Indexed: 12/22/2023]
Abstract
Peripheral nerve regeneration is a complex physiological process. Single-function nerve scaffolds often struggle to quickly adapt to the imbalanced regenerative microenvironment, leading to slow nerve regeneration and limited functional recovery. In this study, we demonstrate a "pleiotropic gas transmitter" strategy based on endogenous reactive oxygen species (ROS), which trigger the on-demand H2S release at the defect area for transected peripheral nerve injury (PNI) repair through concurrent neuroregeneration and neuroprotection processing. This H2S delivery system consists of an H2S donor (peroxyTCM) encapsulated in a ROS-responsive polymer (mPEG-PMet) and loaded into a temperature-sensitive poly (amino acid) hydrogel (mPEG-PA-PP). This multi-effect combination strategy greatly promotes the regeneration of PNI, attributed to the physiological effects of H2S. These effects include the inhibition of inflammation and oxidative stress, protection of nerve cells, promotion of angiogenesis, and the restoration of normal mitochondrial function. The adaptive release of pleiotropic messengers to modulate the tissue regeneration microenvironment offers promising peripheral nerve repair and tissue engineering opportunities.
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Affiliation(s)
- Xianzhen Dong
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Biomedical Materials and Engineering Research Center of Hubei Province, Wuhan 430070, China
| | - Hao Zhang
- Department of Orthopedics Trauma and Microsurgery, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - Ping Duan
- Department of Orthopedics Trauma and Microsurgery, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - Kun Liu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Biomedical Materials and Engineering Research Center of Hubei Province, Wuhan 430070, China
| | - Yifeng Yu
- Department of Orthopedics Trauma and Microsurgery, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - Wenying Wei
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Biomedical Materials and Engineering Research Center of Hubei Province, Wuhan 430070, China
| | - Weixing Wang
- Department of Orthopedics Trauma and Microsurgery, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - Yuhang Liu
- Department of Orthopedics Trauma and Microsurgery, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - Qiang Cheng
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Biomedical Materials and Engineering Research Center of Hubei Province, Wuhan 430070, China
| | - Xinyue Liang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Biomedical Materials and Engineering Research Center of Hubei Province, Wuhan 430070, China
| | - Yuanfang Huo
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Biomedical Materials and Engineering Research Center of Hubei Province, Wuhan 430070, China
| | - Lesan Yan
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Biomedical Materials and Engineering Research Center of Hubei Province, Wuhan 430070, China
| | - Aixi Yu
- Department of Orthopedics Trauma and Microsurgery, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - Honglian Dai
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Biomedical Materials and Engineering Research Center of Hubei Province, Wuhan 430070, China
- Shenzhen Research Institute of Wuhan University of Technology, Shenzhen 518000, China
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3
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Rayner MLD, Grillo A, Williams GR, Tawfik E, Zhang T, Volitaki C, Craig DQM, Healy J, Phillips JB. Controlled local release of PPARγ agonists from biomaterials to treat peripheral nerve injury. J Neural Eng 2020; 17:046030. [PMID: 32780719 DOI: 10.1088/1741-2552/aba7cc] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
OBJECTIVE Poor clinical outcomes following peripheral nerve injury (PNI) are partly attributable to the limited rate of neuronal regeneration. Despite numerous potential drug candidates demonstrating positive effects on nerve regeneration rate in preclinical models, no drugs are routinely used to improve restoration of function in clinical practice. A key challenge associated with clinical adoption of drug treatments in nerve injured patients is the requirement for sustained administration of doses associated with undesirable systemic sideeffects. Local controlled-release drug delivery systems could potentially address this challenge, particularly through the use of biomaterials that can be implanted at the repair site during the microsurgical repair procedure. APPROACH In order to test this concept, this study used various biomaterials to deliver ibuprofen sodium or sulindac sulfide locally in a controlled manner in a rat sciatic nerve injury model. Following characterisation of release parameters in vitro, ethylene vinyl acetate tubes or polylactic-co-glycolic acid wraps, loaded with ibuprofen sodium or sulindac sulfide, were placed around directly-repaired nerve transection or nerve crush injuries in rats. MAIN RESULTS Ibuprofen sodium, but not sulindac sulfide caused an increase in neurites in distal nerve segments and improvements in functional recovery in comparison to controls with no drug treatment. SIGNIFICANCE This study showed for the first time that local delivery of ibuprofen sodium using biomaterials improves neurite growth and functional recovery following PNI and provides the basis for future development of drug-loaded biomaterials suitable for clinical translation.
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Affiliation(s)
- M L D Rayner
- Biomaterials & Tissue Engineering, UCL Eastman Dental Institute, UCL, London, United Kingdom. UCL School of Pharmacy, UCL, London, United Kingdom. UCL Centre for Nerve Engineering, London, United Kingdom
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4
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Sun Y, Liu X, George MN, Park S, Gaihre B, Terzic A, Lu L. Enhanced nerve cell proliferation and differentiation on electrically conductive scaffolds embedded with graphene and carbon nanotubes. J Biomed Mater Res A 2020; 109:193-206. [PMID: 32441388 DOI: 10.1002/jbm.a.37016] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Revised: 04/12/2020] [Accepted: 04/19/2020] [Indexed: 12/18/2022]
Abstract
Conduits that promote nerve regeneration are currently of great medical concern, particularly when gaps exist between nerve endings. To address this issue, our laboratory previously developed a nerve conduit from biodegradable poly(caprolactone fumarate) (PCLF) that supports peripheral nerve regeneration. The present study improves upon this work by further developing an electrically conductive, positively charged PCLF scaffold through the incorporation of graphene, carbon nanotubes (CNTs), and [2-(methacryloyloxy)ethyl]trimethylammonium chloride (MTAC) (PCLF-Graphene-CNT-MTAC) using ultraviolet (UV) induced photocrosslinking. Scanning electron microscopy, transmission electron microscopy, and atomic force microscopy were used to assess the incorporation of CNTs and graphene into PCLF-Graphene-CNT-MTAC scaffolds, which displayed enhanced surface roughness and reduced electrochemical impedance when compared to neat PCLF. Scaffolds with these surface modifications also showed improved growth and differentiation of rat pheochromocytoma 12 cells in vitro, with enhanced cell growth, neurite extension, and cellular migration. Furthermore, an increased number of neurite protrusions were observed when the conduit was electrically stimulated. These results show that the electrically conductive PCLF-Graphene-CNT-MTAC nerve scaffolds presented here support the cellular behaviors that are critical for nerve regeneration, ultimately making this material an attractive candidate for regenerative medicine applications.
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Affiliation(s)
- Yuan Sun
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, Minnesota, USA.,Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota, USA.,Department of Orthopedic Surgery, Shanghai Sixth People's Hospital, Shanghai Jiaotong University, Shanghai, People's Republic of China
| | - Xifeng Liu
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, Minnesota, USA.,Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota, USA
| | - Matthew N George
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, Minnesota, USA.,Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota, USA
| | - Sungjo Park
- Department of Cardiovascular Diseases and Center for Regenerative Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Bipin Gaihre
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, Minnesota, USA.,Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota, USA
| | - Andre Terzic
- Department of Cardiovascular Diseases and Center for Regenerative Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Lichun Lu
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, Minnesota, USA.,Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota, USA
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5
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Chen B, Chen Q, Parkinson DB, Dun XP. Analysis of Schwann Cell Migration and Axon Regeneration Following Nerve Injury in the Sciatic Nerve Bridge. Front Mol Neurosci 2019; 12:308. [PMID: 31920539 PMCID: PMC6914761 DOI: 10.3389/fnmol.2019.00308] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 11/29/2019] [Indexed: 12/18/2022] Open
Abstract
While it is proposed that interaction between Schwann cells and axons is key for successful nerve regeneration, the behavior of Schwann cells migrating into a nerve gap following a transection injury and how migrating Schwann cells interact with regenerating axons within the nerve bridge has not been studied in detail. In this study, we combine the use of our whole-mount sciatic nerve staining with the use of a proteolipid protein-green fluorescent protein (PLP-GFP) mouse model to mark Schwann cells and have examined the behavior of migrating Schwann cells and regenerating axons in the sciatic nerve gap following a nerve transection injury. We show here that Schwann cell migration from both nerve stumps starts later than the regrowth of axons from the proximal nerve stump. The first migrating Schwann cells are only observed 4 days following mouse sciatic nerve transection injury. Schwann cells migrating from the proximal nerve stump overtake regenerating axons on day 5 and form Schwann cell cords within the nerve bridge by 7 days post-transection injury. Regenerating axons begin to attach to migrating Schwann cells on day 6 and then follow their trajectory navigating across the nerve gap. We also observe that Schwann cell cords in the nerve bridge are not wide enough to guide all the regenerating axons across the nerve bridge, resulting in regenerating axons growing along the outside of both proximal and distal nerve stumps. From this analysis, we demonstrate that Schwann cells play a crucial role in controlling the directionality and speed of axon regeneration across the nerve gap. We also demonstrate that the use of the PLP-GFP mouse model labeling Schwann cells together with the whole sciatic nerve axon staining technique is a useful research model to study the process of peripheral nerve regeneration.
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Affiliation(s)
- Bing Chen
- Department of Neurology, The Affiliated Huai'an No.1 People's Hospital of Nanjing Medical University, Huai'an, China
| | - Quan Chen
- Department of Neurology, The Affiliated Huai'an No.1 People's Hospital of Nanjing Medical University, Huai'an, China
| | - David B Parkinson
- Faculty of Health: Medicine, Dentistry and Human Sciences, Plymouth University, Plymouth, United Kingdom
| | - Xin-Peng Dun
- Faculty of Health: Medicine, Dentistry and Human Sciences, Plymouth University, Plymouth, United Kingdom
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Nofar M, Sacligil D, Carreau PJ, Kamal MR, Heuzey MC. Poly (lactic acid) blends: Processing, properties and applications. Int J Biol Macromol 2019; 125:307-60. [PMID: 30528997 DOI: 10.1016/j.ijbiomac.2018.12.002] [Citation(s) in RCA: 269] [Impact Index Per Article: 44.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 11/29/2018] [Accepted: 12/01/2018] [Indexed: 11/21/2022]
Abstract
Poly (lactic acid) or polylactide (PLA) is a commercial biobased, biodegradable, biocompatible, compostable and non-toxic polymer that has competitive material and processing costs and desirable mechanical properties. Thereby, it can be considered favorably for biomedical applications and as the most promising substitute for petroleum-based polymers in a wide range of commodity and engineering applications. However, PLA has some significant shortcomings such as low melt strength, slow crystallization rate, poor processability, high brittleness, low toughness, and low service temperature, which limit its applications. To overcome these limitations, blending PLA with other polymers is an inexpensive approach that could also tailor the final properties of PLA-based products. During the last two decades, researchers investigated the synthesis, processing, properties, and development of various PLA-based blend systems including miscible blends of poly l-lactide (PLLA) and poly d-lactide (PDLA), which generate stereocomplex crystals, binary immiscible/miscible blends of PLA with other thermoplastics, multifunctional ternary blends using a third polymer or fillers such as nanoparticles, as well as PLA-based blend foam systems. This article reviews all these investigations and compares the syntheses/processing-morphology-properties interrelationships in PLA-based blends developed so far for various applications.
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7
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Qian Y, Zhao X, Han Q, Chen W, Li H, Yuan W. An integrated multi-layer 3D-fabrication of PDA/RGD coated graphene loaded PCL nanoscaffold for peripheral nerve restoration. Nat Commun 2018; 9:323. [PMID: 29358641 PMCID: PMC5778129 DOI: 10.1038/s41467-017-02598-7] [Citation(s) in RCA: 185] [Impact Index Per Article: 30.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 12/06/2017] [Indexed: 01/01/2023] Open
Abstract
As a conductive nanomaterial, graphene has huge potentials in nerve function restoration by promoting electrical signal transduction and metabolic activities with unique topological properties. Polydopamine (PDA) and arginylglycylaspartic acid (RGD) can improve cell adhesion in tissue engineering. Here we report an integrated 3D printing and layer-by-layer casting (LBLC) method in multi-layered porous scaffold fabrication. The scaffold is composed of single-layered graphene (SG) or multi-layered graphene (MG) and polycaprolactone (PCL). The electrically conductive 3D graphene scaffold can significantly improve neural expression both in vitro and in vivo. It promotes successful axonal regrowth and remyelination after peripheral nerve injury. These findings implicate that graphene-based nanotechnology have great potentials in peripheral nerve restoration in preclinical and clinical application.
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Affiliation(s)
- Yun Qian
- School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
- Department of Orthopedics, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, 600 Yishan Road, Shanghai, 200233, China
- Shanghai Sixth People's Hospital East Campus, Shanghai University of Medicine and Health, Shanghai, 201306, China
| | - Xiaotian Zhao
- School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
| | - Qixin Han
- Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200135, China
| | - Wei Chen
- Department of Orthopedics, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, 600 Yishan Road, Shanghai, 200233, China
| | - Hui Li
- School of Medicine, University of California, 1450 Third St., San Francisco, CA, 94158, USA
| | - Weien Yuan
- School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China.
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8
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Zhou C, Liu B, Huang Y, Zeng X, You H, Li J, Zhang Y. The effect of four types of artificial nerve graft structures on the repair of 10-mm rat sciatic nerve gap. J Biomed Mater Res A 2017; 105:3077-3085. [PMID: 28782192 PMCID: PMC5659138 DOI: 10.1002/jbm.a.36172] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 07/01/2017] [Accepted: 08/01/2017] [Indexed: 12/17/2022]
Abstract
Investigating the effect of four types of artificial nerve graft (ANG) structures on rat sciatic nerve defect repair will aid future ANG designs. In this study, fibroin fibers and polylactic acid were used to prepare four ANGs with differing structures: nerve conduit with micron-sized pores (Conduit with pore group), nerve conduit without micron-sized pores (Conduit group), nerve scaffold comprising Conduit with pore group material plus silk fibers (Scaffold with pore group), and nerve scaffold comprising Conduit group material plus silk fibers (Scaffold group). ANGs or autologous nerves (Autologous group) were implanted into 10 mm rat sciatic nerve defects (n = 50 per group). Twenty weeks after nerve grafting, the time required to retract the surgical limb from the hot water was ranked as follows: Conduit with pore group > Scaffold with pore group > Conduit group > Scaffold group > Autologous group. The static sciatic index was ranked in descending order: Autologous group > Scaffold group > Conduit group > Scaffold with pore group > Conduit with pore group. Immunofluorescence staining identified significant differences in the distribution and number of axons, Schwann cells, and fibroblasts. These findings indicate that ANGs with micron-sized pores had a negative impact on the repair of peripheral nerve defects, while internal microchannels were beneficial. © 2017 The Authors. Journal of Biomedical Materials Research Part A Published by Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 3077-3085, 2017.
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Affiliation(s)
- Chan Zhou
- Chongqing Academy of Animal Science, Chongqing, 400015, China
| | - Bin Liu
- Key Laboratory of Freshwater Fish Reproduction and Development, Ministry of Education, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Yong Huang
- Chongqing Academy of Animal Science, Chongqing, 400015, China
| | - Xiu Zeng
- Chongqing Academy of Animal Science, Chongqing, 400015, China
| | - Huajian You
- Key Laboratory of Freshwater Fish Reproduction and Development, Ministry of Education, School of Life Sciences, Southwest University, Chongqing, 400715, China.,Chongqing academy of Chinese medicine, Chongqing, 400065, China
| | - Jin Li
- Chongqing Academy of Animal Science, Chongqing, 400015, China.,Key Laboratory of Freshwater Fish Reproduction and Development, Ministry of Education, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Yaoguang Zhang
- Key Laboratory of Freshwater Fish Reproduction and Development, Ministry of Education, School of Life Sciences, Southwest University, Chongqing, 400715, China
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Assaf K, Leal CV, Derami MS, de Rezende Duek EA, Ceragioli HJ, de Oliveira ALR. Sciatic nerve repair using poly(ε-caprolactone) tubular prosthesis associated with nanoparticles of carbon and graphene. Brain Behav 2017; 7:e00755. [PMID: 28828216 PMCID: PMC5561316 DOI: 10.1002/brb3.755] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 05/18/2017] [Accepted: 05/20/2017] [Indexed: 12/12/2022] Open
Abstract
INTRODUCTION Injuries to peripheral nerves generate disconnection between spinal neurons and the target organ. Due to retraction of the nerve stumps, end-to-end neurorrhaphy is usually unfeasible. In such cases, autologous grafts are widely used, nonetheless with some disadvantages, such as mismatching of donor nerve dimensions and formation of painful neuromas at the donor area. Tubulization, using bioresorbable polymers, can potentially replace nerve grafting, although improvements are still necessary. Among promising bioresorbable synthetic polymers, poly(l-lactic acid) (PLLA) and poly(ε-caprolactone) (PCL) are the most studied. Carbon nanotubes and graphene sheets have been proposed, however, as adjuvants to improve mechanical and regenerative properties of tubular prostheses. Thus, the present work evaluated nerve tubulization repair following association of PCL with nanoparticles of carbon (NPC) and graphene (NPG). METHODS For that, adult Lewis rats were subjected to unilateral sciatic nerve tubulization and allowed to survive for up to 8 and 12 weeks postsurgery. RESULTS Nanocomposites mechanical/chemical evaluation showed that nanoparticles do not alter PCL crystallinity, yet providing reinforcement of polymer matrix. Thus, there was a decrease in the enthalpy of melting when the mixture of PCL + NPC + NPG was used. Nanocomposites displayed positive changes in molecular mobility in the amorphous phase of the polymer. Also, the loss modulus (E") and the glass transition exhibited highest values for PCL + NPC + NPG. Scanning electron microscopy analysis revealed that PCL + NPC + NPG prostheses showed improved cell adhesion as compared to PCL alone. Surgical procedures with PCL + NPC + NPG were facilitated due to improved flexibility of the prosthesis, resulting in better stump positioning accuracy. In turn, a twofold increased number of myelinated axons was found in such repaired nerves. Consistent with that, target muscle atrophy protection has been observed. CONCLUSION Overall, the present data show that nanocomposite PCL tubes facilitate nerve repair and result in a better regenerative outcome, what may, in turn, represent a new alternative to pure PCL or PLLA prostheses.
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Affiliation(s)
- Kyl Assaf
- Department of Structural and Functional Biology Institute of Biology University of Campinas - UNICAMP Campinas Brazil
| | - Claudenete Vieira Leal
- Department of Materials Engineering Faculty of Mechanical Engineering University of Campinas - UNICAMP Campinas Brazil
| | - Mariana Silveira Derami
- Department of Structural and Functional Biology Institute of Biology University of Campinas - UNICAMP Campinas Brazil
| | - Eliana Aparecida de Rezende Duek
- Department of Materials Engineering Faculty of Mechanical Engineering University of Campinas - UNICAMP Campinas Brazil.,Department of Physiological Sciences Biomaterials Laboratory PUC-SP Brazil
| | - Helder Jose Ceragioli
- Faculty of Electric Engineering and Computation (FEEC) University of Campinas - UNICAMP Campinas Brazil
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Sachot N, Roguska A, Planell JA, Lewandowska M, Engel E, Castaño O. Fast-degrading PLA/ORMOGLASS fibrous composite scaffold leads to a calcium-rich angiogenic environment. Int J Nanomedicine 2017; 12:4901-4919. [PMID: 28744124 PMCID: PMC5513849 DOI: 10.2147/ijn.s135806] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
The success of scaffold implantation in acellular tissue engineering approaches relies on the ability of the material to interact properly with the biological environment. This behavior mainly depends on the design of the graft surface and, more precisely, on its capacity to biodegrade in a well-defined manner (nature of ions released, surface-to-volume ratio, dissolution profile of this release, rate of material resorption, and preservation of mechanical properties). The assessment of the biological behavior of temporary templates is therefore very important in tissue engineering, especially for composites, which usually exhibit complicated degradation behavior. Here, blended polylactic acid (PLA) calcium phosphate ORMOGLASS (organically modified glass) nanofibrous mats have been incubated up to 4 weeks in physiological simulated conditions, and their morphological, topographical, and chemical changes have been investigated. The results showed that a significant loss of inorganic phase occurred at the beginning of the immersion and the ORMOGLASS maintained a stable composition afterward throughout the degradation period. As a whole, the nanostructured scaffolds underwent fast and heterogeneous degradation. This study reveals that an angiogenic calcium-rich environment can be achieved through fast-degrading ORMOGLASS/PLA blended fibers, which seems to be an excellent alternative for guided bone regeneration.
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Affiliation(s)
- Nadège Sachot
- Biomaterials for Regenerative Therapies, Institute for Bioengineering of Catalonia (IBEC), Barcelona
- CIBER en Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, Zaragoza, Spain
| | - Agata Roguska
- Faculty of Materials Science and Engineering, Warsaw University of Technology, Warsaw, Poland
| | - Josep Anton Planell
- Biomaterials for Regenerative Therapies, Institute for Bioengineering of Catalonia (IBEC), Barcelona
- CIBER en Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, Zaragoza, Spain
| | - Malgorzata Lewandowska
- Faculty of Materials Science and Engineering, Warsaw University of Technology, Warsaw, Poland
| | - Elisabeth Engel
- Biomaterials for Regenerative Therapies, Institute for Bioengineering of Catalonia (IBEC), Barcelona
- CIBER en Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, Zaragoza, Spain
- Department of Materials Science and Metallurgical Engineering, Universitat Politècnica de Catalunya (UPC)
| | - Oscar Castaño
- Biomaterials for Regenerative Therapies, Institute for Bioengineering of Catalonia (IBEC), Barcelona
- CIBER en Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, Zaragoza, Spain
- Department of Materials Science and Physical Chemistry, Universitat de Barcelona (UB)
- Department of Engineerings: Electronics, Universitat de Barcelona, Barcelona, Spain
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11
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Liu X, Miller AL, Park S, Waletzki BE, Zhou Z, Terzic A, Lu L. Functionalized Carbon Nanotube and Graphene Oxide Embedded Electrically Conductive Hydrogel Synergistically Stimulates Nerve Cell Differentiation. ACS Appl Mater Interfaces 2017; 9:14677-14690. [PMID: 28406608 DOI: 10.1021/acsami.7b02072] [Citation(s) in RCA: 121] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Nerve regeneration after injury is a critical medical issue. In previous work, we have developed an oligo(poly(ethylene glycol) fumarate) (OPF) hydrogel incorporated with positive charges as a promising nerve conduit. In this study, we introduced cross-linkable bonds to graphene oxide and carbon nanotube to obtain the functionalized graphene oxide acrylate (GOa) and carbon nanotube poly(ethylene glycol) acrylate (CNTpega). An electrically conductive hydrogel was then fabricated by covalently embedding GOa and CNTpega within OPF hydrogel through chemical cross-linking followed by in situ reduction of GOa in l-ascorbic acid solution. Positive charges were incorporated by 2-(methacryloyloxy)ethyltrimethylammonium chloride (MTAC) to obtain rGOaCNTpega-OPF-MTAC composite hydrogel with both surface charge and electrical conductivity. The distribution of CNTpega and GOa in the hydrogels was substantiated by transmission electron microscopy (TEM), and strengthened electrical conductivities were determined. Excellent biocompatibility was demonstrated for the carbon embedded composite hydrogels. Biological evaluation showed enhanced proliferation and spreading of PC12 cells on the conductive hydrogels. After induced differentiation using nerve growth factor (NGF), cells on the conductive hydrogels were effectively stimulated to have robust neurite development as observed by confocal microscope. A synergistic effect of electrical conductivity and positive charges on nerve cells was also observed in this study. Using a glass mold method, the composite hydrogel was successfully fabricated into conductive nerve conduits with surficial positive charges. These results suggest that rGOa-CNTpega-OPF-MTAC composite hydrogel holds great potential as conduits for neural tissue engineering.
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Affiliation(s)
- Xifeng Liu
- Department of Physiology and Biomedical Engineering, ‡Department of Orthopedic Surgery, and §Department of Cardiovascular Diseases and Center for Regenerative Medicine, Mayo Clinic , Rochester, Minnesota 55905, United States
| | - A Lee Miller
- Department of Physiology and Biomedical Engineering, ‡Department of Orthopedic Surgery, and §Department of Cardiovascular Diseases and Center for Regenerative Medicine, Mayo Clinic , Rochester, Minnesota 55905, United States
| | - Sungjo Park
- Department of Physiology and Biomedical Engineering, ‡Department of Orthopedic Surgery, and §Department of Cardiovascular Diseases and Center for Regenerative Medicine, Mayo Clinic , Rochester, Minnesota 55905, United States
| | - Brian E Waletzki
- Department of Physiology and Biomedical Engineering, ‡Department of Orthopedic Surgery, and §Department of Cardiovascular Diseases and Center for Regenerative Medicine, Mayo Clinic , Rochester, Minnesota 55905, United States
| | - Zifei Zhou
- Department of Physiology and Biomedical Engineering, ‡Department of Orthopedic Surgery, and §Department of Cardiovascular Diseases and Center for Regenerative Medicine, Mayo Clinic , Rochester, Minnesota 55905, United States
| | - Andre Terzic
- Department of Physiology and Biomedical Engineering, ‡Department of Orthopedic Surgery, and §Department of Cardiovascular Diseases and Center for Regenerative Medicine, Mayo Clinic , Rochester, Minnesota 55905, United States
| | - Lichun Lu
- Department of Physiology and Biomedical Engineering, ‡Department of Orthopedic Surgery, and §Department of Cardiovascular Diseases and Center for Regenerative Medicine, Mayo Clinic , Rochester, Minnesota 55905, United States
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Yao Q, Cosme JG, Xu T, Miszuk JM, Picciani PH, Fong H, Sun H. Three dimensional electrospun PCL/PLA blend nanofibrous scaffolds with significantly improved stem cells osteogenic differentiation and cranial bone formation. Biomaterials 2017; 115:115-27. [PMID: 27886552 DOI: 10.1016/j.biomaterials.2016.11.018] [Citation(s) in RCA: 325] [Impact Index Per Article: 40.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 11/09/2016] [Accepted: 11/14/2016] [Indexed: 12/30/2022]
Abstract
Nanofibrous scaffolds that are morphologically/structurally similar to natural ECM are highly interested for tissue engineering; however, the electrospinning technique has the difficulty in directly producing clinically relevant 3D nanofibrous scaffolds with desired structural properties. To address this challenge, we have developed an innovative technique of thermally induced nanofiber self-agglomeration (TISA) recently. The aim of this work was to prepare (via the TISA technique) and evaluate 3D electrospun PCL/PLA blend (mass ratio: 4/1) nanofibrous scaffolds having high porosity of ∼95.8% as well as interconnected and hierarchically structured pores with sizes from sub-micrometers to ∼300 μm for bone tissue engineering. The hypothesis was that the incorporation of PLA (with higher mechanical stiffness/modulus and bioactivity) into PCL nanofibers would significantly improve human mesenchymal stem cells (hMSCs) osteogenic differentiation in vitro and bone formation in vivo. Compared to neat PCL-3D scaffolds, PCL/PLA-3D blend scaffolds had higher mechanical properties and in vitro bioactivity; as a result, they not only enhanced the cell viability of hMSCs but also promoted the osteogenic differentiation. Furthermore, our in vivo studies revealed that PCL/PLA-3D scaffolds considerably facilitated new bone formation in a critical-sized cranial bone defect mouse model. In summary, both in vitro and in vivo results indicated that novel 3D electrospun PCL/PLA blend nanofibrous scaffolds would be strongly favorable/desired for hMSCs osteogenic differentiation and cranial bone formation.
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Mobasseri A, Faroni A, Minogue BM, Downes S, Terenghi G, Reid AJ. Polymer scaffolds with preferential parallel grooves enhance nerve regeneration. Tissue Eng Part A 2015; 21:1152-62. [PMID: 25435096 DOI: 10.1089/ten.tea.2014.0266] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
We have modified the surface topography of poly ɛ-caprolactone (PCL) and polylactic acid (PLA) blended films to improve cell proliferation and to guide the regeneration of peripheral nerves. Films with differing shaped grooves were made using patterned silicon templates, sloped walls (SL), V-shaped (V), and square-shaped (SQ), and compared with nongrooved surfaces with micropits. The solvent cast films were tested in vitro using adult adipose-derived stem cells differentiated to Schwann cell-like cells. Cell attachment, proliferation, and cell orientation were all improved on the grooved surfaces, with SL grooves giving the best results. We present in vivo data on Sprague-Dawley rat sciatic nerve injury with a 10-mm gap, evaluating nerve regeneration at 3 weeks across a polymer nerve conduit modified with intraluminal grooves (SL, V, and SQ) and differing wall thicknesses (70, 100, 120, and 210 μm). The SL-grooved nerve conduit showed a significant improvement over the other topographical-shaped grooves, while increasing the conduit wall thickness saw no positive effect on the biological response of the regenerating nerve. Furthermore, the preferred SL-grooved conduit (C) with 70 μm wall thickness was compared with the current clinical gold standard of autologous nerve graft (Ag) in the rat 10-mm sciatic nerve gap model. At 3 weeks postsurgery, all nerve gaps across both groups were bridged with regenerated nerve fibers. At 16 weeks, features of regenerated axons were comparable between the autograft (Ag) and conduit (C) groups. End organ assessments of muscle weight, electromyography, and skin reinnervation were also similar between the groups. The comparable experimental outcome between conduit and autograft, suggests that the PCL/PLA conduit with inner lumen microstructured grooves could be used as a potential alternative treatment for peripheral nerve repair.
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Affiliation(s)
- Atefeh Mobasseri
- 1 Blond McIndoe Laboratories, Centre for Tissue Injury and Repair, Institute of Inflammation & Repair, University of Manchester , Manchester, United Kingdom
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14
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Abstract
Peripheral nerve injury is a worldwide clinical problem which could lead to loss of neuronal communication along sensory and motor nerves between the central nervous system (CNS) and the peripheral organs and impairs the quality of life of a patient. The primary requirement for the treatment of complete lesions is a tension-free, end-to-end repair. When end-to-end repair is not possible, peripheral nerve grafts or nerve conduits are used. The limited availability of autografts, and drawbacks of the allografts and xenografts like immunological reactions, forced the researchers to investigate and develop alternative approaches, mainly nerve conduits. In this review, recent information on the various types of conduit materials (made of biological and synthetic polymers) and designs (tubular, fibrous, and matrix type) are being presented.
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Affiliation(s)
- D Arslantunali
- BIOMATEN, Center of Excellence in Biomaterials and Tissue Engineering, Middle East Technical University (METU), Ankara, Turkey ; Department of Biotechnology, METU, Ankara, Turkey ; Department of Bioengineering, Gumushane University, Gumushane, Turkey
| | - T Dursun
- BIOMATEN, Center of Excellence in Biomaterials and Tissue Engineering, Middle East Technical University (METU), Ankara, Turkey ; Department of Biotechnology, METU, Ankara, Turkey
| | - D Yucel
- BIOMATEN, Center of Excellence in Biomaterials and Tissue Engineering, Middle East Technical University (METU), Ankara, Turkey ; Faculty of Engineering, Department of Medical Engineering, Acibadem University, Istanbul, Turkey ; School of Medicine, Department of Histology and Embryology, Acibadem University, Istanbul, Turkey
| | - N Hasirci
- BIOMATEN, Center of Excellence in Biomaterials and Tissue Engineering, Middle East Technical University (METU), Ankara, Turkey ; Department of Biotechnology, METU, Ankara, Turkey ; Department of Chemistry, Faculty of Arts and Sciences, METU, Ankara, Turkey
| | - V Hasirci
- BIOMATEN, Center of Excellence in Biomaterials and Tissue Engineering, Middle East Technical University (METU), Ankara, Turkey ; Department of Biotechnology, METU, Ankara, Turkey ; Department of Biological Sciences, Faculty of Arts and Sciences, METU, Ankara, Turkey
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Abstract
Injuries to peripheral nerves are common and cause life-changing problems for patients alongside high social and health care costs for society. Current clinical treatment of peripheral nerve injuries predominantly relies on sacrificing a section of nerve from elsewhere in the body to provide a graft at the injury site. Much work has been done to develop a bioengineered nerve graft, precluding sacrifice of a functional nerve. Stem cells are prime candidates as accelerators of regeneration in these nerve grafts. This review examines the potential of adipose-derived stem cells to improve nerve repair assisted by bioengineered nerve grafts.
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Affiliation(s)
- Alessandro Faroni
- Blond McIndoe Laboratories, Institute of Inflammation and Repair, University of Manchester, Manchester, UK
| | - Richard Jp Smith
- Blond McIndoe Laboratories, Institute of Inflammation and Repair, University of Manchester, Manchester, UK
| | - Adam J Reid
- Blond McIndoe Laboratories, Institute of Inflammation and Repair, University of Manchester, Manchester, UK ; Department of Plastic Surgery & Burns, University Hospital of South Manchester, Manchester, UK
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Weigel S, Osterwalder T, Tobler U, Yao L, Wiesli M, Lehnert T, Pandit A, Bruinink A. Surface microstructures on planar substrates and textile fibers guide neurite outgrowth: a scaffold solution to push limits of critical nerve defect regeneration? PLoS One 2012; 7:e50714. [PMID: 23251379 PMCID: PMC3520951 DOI: 10.1371/journal.pone.0050714] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2012] [Accepted: 10/23/2012] [Indexed: 01/30/2023] Open
Abstract
The treatment of critical size peripheral nerve defects represents one of the most serious problems in neurosurgery. If the gap size exceeds a certain limit, healing can't be achieved. Connection mismatching may further reduce the clinical success. The present study investigates how far specific surface structures support neurite outgrowth and by that may represent one possibility to push distance limits that can be bridged. For this purpose, growth cone displacement of fluorescent embryonic chicken spinal cord neurons was monitored using time-lapse video. In a first series of experiments, parallel patterns of polyimide ridges of different geometry were created on planar silicon oxide surfaces. These channel-like structures were evaluated with and without amorphous hydrogenated carbon (a-C:H) coating. In a next step, structured and unstructured textile fibers were investigated. All planar surface materials (polyimide, silicon oxide and a-C:H) proved to be biocompatible, i.e. had no adverse effect on nerve cultures and supported neurite outgrowth. Mean growth cone migration velocity measured on 5 minute base was marginally affected by surface structuring. However, surface structure variability, i.e. ridge height, width and inter-ridge spacing, significantly enhanced the resulting net velocity by guiding the growth cone movement. Ridge height and inter-ridge distance affected the frequency of neurites crossing over ridges. Of the evaluated dimensions ridge height, width, and inter-ridge distance of respectively 3, 10, and 10 µm maximally supported net axon growth. Comparable artificial grooves, fabricated onto the surface of PET fibers by using an excimer laser, showed similar positive effects. Our data may help to further optimize surface characteristics of artificial nerve conduits and bioelectronic interfaces.
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Affiliation(s)
- Stefan Weigel
- MaTisMed, Materials-Biology Interactions Lab, EMPA Materials Science and Technology, St. Gallen, Switzerland
- Technische Universität München, Zoology, Freising-Weihenstephan, Germany
| | - Thomas Osterwalder
- MaTisMed, Materials-Biology Interactions Lab, EMPA Materials Science and Technology, St. Gallen, Switzerland
| | - Ursina Tobler
- MaTisMed, Materials-Biology Interactions Lab, EMPA Materials Science and Technology, St. Gallen, Switzerland
| | - Li Yao
- National Center for Biomedical Engineering Science, National University of Ireland, Galway, Ireland
- Department of Biological Sciences, Wichita State University, Wichita, United States of America
| | - Manuel Wiesli
- MaTisMed, Materials-Biology Interactions Lab, EMPA Materials Science and Technology, St. Gallen, Switzerland
| | - Thomas Lehnert
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratory for Microsystems 2, Lausanne, Switzerland
| | - Abhay Pandit
- National Center for Biomedical Engineering Science, National University of Ireland, Galway, Ireland
| | - Arie Bruinink
- MaTisMed, Materials-Biology Interactions Lab, EMPA Materials Science and Technology, St. Gallen, Switzerland
- * E-mail:
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17
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Moroder P, Runge MB, Wang H, Ruesink T, Lu L, Spinner RJ, Windebank AJ, Yaszemski MJ. Material properties and electrical stimulation regimens of polycaprolactone fumarate-polypyrrole scaffolds as potential conductive nerve conduits. Acta Biomater 2011; 7:944-53. [PMID: 20965280 DOI: 10.1016/j.actbio.2010.10.013] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2010] [Revised: 10/01/2010] [Accepted: 10/12/2010] [Indexed: 11/21/2022]
Abstract
The mechanical and electrical properties of polycaprolactone fumarate-polypyrrole (PCLF-PPy) scaffolds were studied under physiological conditions to evaluate their ability to maintain the material properties necessary for application as conductive nerve conduits. PC12 cells cultured on PCLF-PPy scaffolds were stimulated with regimens of 10 μA of either a constant or a 20 Hz frequency current passed through the scaffolds for 1h per day. PC12 cellular morphologies were analyzed by fluorescence microscopy after 48 h. PCLF-PPy scaffolds exhibited excellent mechanical properties at 37 °C which would allow suturing and flexibility. The surface resistivity of the scaffolds was 2 kΩ and the scaffolds were electrically stable during the application of electrical stimulation (ES). In vitro studies showed significant increases in the percentage of neurite bearing cells, number of neurites per cell and neurite length in the presence of ES compared with no ES. Additionally, extending neurites were observed to align in the direction of the applied current. This study shows that electrically conductive PCLF-PPy scaffolds possess the material properties necessary for application as nerve conduits. Additionally, the capability to significantly enhance and direct neurite extension by passing an electrical current through PCLF-PPy scaffolds renders them even more promising as future therapeutic treatments for severe nerve injuries.
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