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Yu T, Wen L, He J, Xu Y, Li T, Wang W, Ma Y, Ahmad MA, Tian X, Fan J, Wang X, Hagiwara H, Ao Q. Fabrication and evaluation of an optimized acellular nerve allograft with multiple axial channels. Acta Biomater 2020; 115:235-249. [PMID: 32771587 DOI: 10.1016/j.actbio.2020.07.059] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 07/29/2020] [Accepted: 07/30/2020] [Indexed: 12/19/2022]
Abstract
Acellular nerve allografts are promising alternatives to autologous nerve grafts, but still have many drawbacks which greatly limit their curative effects. Here, we developed an optimized acellular nerve allograft with multiple axial channels by a modified decellularization method. These allografts were confirmed to preserve more extracellular matrix components and factors, and remove cellular components effectively. Meanwhile, macrochannels and microchannels were introduced to optimize internal microstructure of allografts, which increases porosity and water absorption, without significant loss of mechanical strength. The in vitro experiments demonstrated that the multichannel allografts showed superior ability of facilitating proliferation and penetration of Schwann cells. Additionally, in the in vivo experiments, the multichannel allografts were used to bridge 10 mm rat sciatic nerve defects. They exhibited better capacity to guide regenerative nerve fibers through the defective segment and restore innervation of target organs, thus achieving better recovery of muscle and motor function, in comparison with conventional acellular allografts. These findings indicate that this multichannel acellular nerve allograft has great potential for clinical application and provides a new prospective for future investigations of nerve regeneration. STATEMENT OF SIGNIFICANCE: Acellular nerve allografts, with preservation of natural extracellular matrix, are officially approved to repair peripheral nerve injury in some countries. However, bioactive component loss and compact internal structure result in variable clinical effects of conventional acellular allografts. In the present study, we fabricated an optimized acellular nerve allograft with multiple axial channels, which could both enable decellularization to be easily accomplished and reduce the amount of detergents in the preparation process. Characterization of the multichannel acellular allografts was confirmed to have better preservation of ECM bioactive molecules and regenerative factors. Efficiency evaluation showed the multichannel allografts could facilitate Schwann cells to migrate inside them in vitro, and enhance regrowth and myelination of axons as well as recovery of muscle and motor function in vivo.
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Jang SR, Kim JI, Park CH, Kim CS. The controlled design of electrospun PCL/silk/quercetin fibrous tubular scaffold using a modified wound coil collector and L-shaped ground design for neural repair. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 111:110776. [PMID: 32279813 DOI: 10.1016/j.msec.2020.110776] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 02/18/2020] [Accepted: 02/24/2020] [Indexed: 12/28/2022]
Abstract
Asymmetrically porous and aligned fibrous tubular conduit with selective permeability as a biomimetic neural scaffold was manufactured using polycaprolactone (PCL), silk, and quercetin by a modified electrospinning method. The outer surface of the randomly oriented fibrous scaffold had microscale pores that could prevent fibrous tissue invasion (FTI), but could permeate neurotrophic factors, nutrients, and oxygen. The inner surface of the aligned fibrous scaffold can be favorable for neurite outgrowth, because of their superior neural cell attachment, migration, and directional growth. In vitro and in vivo studies have demonstrated the therapeutic effect of Quercetin, a ubiquitous flavonoid widely distributed in plants, on neuropathy, by modulating the expression of NRF-2-dependent antioxidant responsive elements. In this study, the controlled inner and outer surface geometry of the 0.5, 1.0, and 2.0 wt% quercetin-containing electrospun PCL/silk fibrous tubular scaffold fabricated via a modified wound coil collector and L-shaped ground design (WCC-LG) was characterized by FE-SEM, TEM, FFT, FT-IR, and XRD. In addition, two types of neural cell lines, PC12 and S42, were used to evaluate the cell proliferation rate of the different amount of quercetin-loaded PCL/silk tubular scaffolds.
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Affiliation(s)
- Se Rim Jang
- Department of Bionanosystem Engineering, Graduate School, Jeonbuk National University, Jeonju 561-756, Republic of Korea
| | - Jeong In Kim
- Department of Bionanosystem Engineering, Graduate School, Jeonbuk National University, Jeonju 561-756, Republic of Korea
| | - Chan Hee Park
- Department of Bionanosystem Engineering, Graduate School, Jeonbuk National University, Jeonju 561-756, Republic of Korea; Division of Mechanical Design Engineering, College of Engineering, Jeonbuk National University, Jeonju 561-756, Republic of Korea.
| | - Cheol Sang Kim
- Department of Bionanosystem Engineering, Graduate School, Jeonbuk National University, Jeonju 561-756, Republic of Korea; Division of Mechanical Design Engineering, College of Engineering, Jeonbuk National University, Jeonju 561-756, Republic of Korea.
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Lovati AB, D’Arrigo D, Odella S, Tos P, Geuna S, Raimondo S. Nerve Repair Using Decellularized Nerve Grafts in Rat Models. A Review of the Literature. Front Cell Neurosci 2018; 12:427. [PMID: 30510503 PMCID: PMC6254089 DOI: 10.3389/fncel.2018.00427] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Accepted: 10/30/2018] [Indexed: 12/22/2022] Open
Abstract
Peripheral nerve regeneration after severe traumatic nerve injury is a relevant clinical problem. Several different strategies have been investigated to solve the problem of bridging the nerve gap. Among these, the use of decellularized nerve grafts has been proposed as an alternative to auto/isografts, which represent the current gold standard in the treatment of severe nerve injury. This study reports the results of a systematic review of the literature published between January 2007 and October 2017. The aim was to quantitatively analyze the effectiveness of decellularized nerve grafts in rat experimental models. The review included 33 studies in which eight different decellularization protocols were described. The decellularized nerve grafts were reported to be immunologically safe and able to support both functional and morphological regeneration after nerve injury. Chemical protocols were found to be superior to physical protocols. However, further research is needed to optimize preparation protocols, including recellularization, improve their effectiveness, and substitute the current gold standard, especially in the repair of long nerve defects.
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Affiliation(s)
- Arianna B. Lovati
- Cell and Tissue Engineering Laboratory, IRCCS Istituto Ortopedico Galeazzi, Milan, Italy
| | - Daniele D’Arrigo
- Cell and Tissue Engineering Laboratory, IRCCS Istituto Ortopedico Galeazzi, Milan, Italy
| | - Simonetta Odella
- UOC Hand Surgery and Reconstructive Microsurgery Unit, ASST G. Pini-CTO, Milan, Italy
| | - Pierluigi Tos
- UOC Hand Surgery and Reconstructive Microsurgery Unit, ASST G. Pini-CTO, Milan, Italy
| | - Stefano Geuna
- Department of Clinical and Biological Sciences, San Luigi Gonzaga Hospital, University of Turin, Turin, Italy
| | - Stefania Raimondo
- Department of Clinical and Biological Sciences, San Luigi Gonzaga Hospital, University of Turin, Turin, Italy
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Rayner MLD, Laranjeira S, Evans RE, Shipley RJ, Healy J, Phillips JB. Developing an In Vitro Model to Screen Drugs for Nerve Regeneration. Anat Rec (Hoboken) 2018; 301:1628-1637. [PMID: 30334365 PMCID: PMC6282521 DOI: 10.1002/ar.23918] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 02/24/2018] [Accepted: 03/25/2018] [Indexed: 12/29/2022]
Abstract
Peripheral nerve injuries (PNI) have a high prevalence and can be debilitating, resulting in life‐long loss or disturbance in end‐organ function, which compromises quality of life for patients. Current therapies use microsurgical approaches but there is the potential for enhancing recovery through other therapeutic modalities such as; cell‐based conduits, gene therapy and small molecules. A number of molecular targets and drugs which have the potential to improve nerve regeneration have been identified, however, there are challenges associated with moving therapies toward clinical translation. Due to the lack of detailed knowledge about the pro‐regenerative effect of potential drug treatments, there is a need for effective in vitro models to screen compounds to inform future pre‐clinical and clinical studies. The interaction between regenerating neurites and supporting Schwann cells is a key feature of the nerve environment, therefore, in vitro models that mimic this cellular association are useful tools. In this study, we have investigated various cell culture models, including simple monolayer systems and more complex 3D‐engineered co‐cultures, as models for use in PNI drug development. Anat Rec, 301:1628–1637, 2018. © 2018 The Authors. The Anatomical Record published by Wiley Periodicals, Inc. on behalf of American Association of Anatomists.
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Affiliation(s)
- Melissa L D Rayner
- Biomaterials & Tissue Engineering, UCL Eastman Dental Institute, WC1X 8LD, London, UK.,Department of Pharmacology, UCL School of Pharmacy, 29-39 Brunswick Square WC1N 1AX, London, UK.,UCL Centre for Nerve Engineering, University College London, WC1E 6BT, London, UK
| | - Simão Laranjeira
- UCL Centre for Nerve Engineering, University College London, WC1E 6BT, London, UK.,UCL Department of Mechanical Engineering, University College London, WC1E 7JEK, London, UK
| | - Rachael E Evans
- Biomaterials & Tissue Engineering, UCL Eastman Dental Institute, WC1X 8LD, London, UK.,Department of Pharmacology, UCL School of Pharmacy, 29-39 Brunswick Square WC1N 1AX, London, UK.,UCL Centre for Nerve Engineering, University College London, WC1E 6BT, London, UK
| | - Rebecca J Shipley
- UCL Centre for Nerve Engineering, University College London, WC1E 6BT, London, UK.,UCL Department of Mechanical Engineering, University College London, WC1E 7JEK, London, UK
| | - Jess Healy
- Department of Pharmacology, UCL School of Pharmacy, 29-39 Brunswick Square WC1N 1AX, London, UK.,UCL Centre for Nerve Engineering, University College London, WC1E 6BT, London, UK
| | - James B Phillips
- Biomaterials & Tissue Engineering, UCL Eastman Dental Institute, WC1X 8LD, London, UK.,Department of Pharmacology, UCL School of Pharmacy, 29-39 Brunswick Square WC1N 1AX, London, UK.,UCL Centre for Nerve Engineering, University College London, WC1E 6BT, London, UK
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Geuna S, Raimondo S, Fregnan F, Haastert-Talini K, Grothe C. In vitromodels for peripheral nerve regeneration. Eur J Neurosci 2015; 43:287-96. [DOI: 10.1111/ejn.13054] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Revised: 08/03/2015] [Accepted: 08/20/2015] [Indexed: 01/10/2023]
Affiliation(s)
- S. Geuna
- Department of Clinical and Biological Sciences, and Cavalieri Ottolenghi Neuroscience Institute; University of Turin; Ospedale San Luigi, Regione Gonzole 10 10043 Orbassano Turin Italy
| | - S. Raimondo
- Department of Clinical and Biological Sciences, and Cavalieri Ottolenghi Neuroscience Institute; University of Turin; Ospedale San Luigi, Regione Gonzole 10 10043 Orbassano Turin Italy
| | - F. Fregnan
- Department of Clinical and Biological Sciences, and Cavalieri Ottolenghi Neuroscience Institute; University of Turin; Ospedale San Luigi, Regione Gonzole 10 10043 Orbassano Turin Italy
| | - K. Haastert-Talini
- Institute of Neuroanatomy; Hannover Medical School and Center for Systems Neuroscience (ZSN); Hannover Germany
| | - C. Grothe
- Institute of Neuroanatomy; Hannover Medical School and Center for Systems Neuroscience (ZSN); Hannover Germany
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Lu M, Wang Y, Yue L, Chiu J, He F, Wu X, Zang B, Lu B, Yao X, Jiang Z. Follow-up evaluation with ultrasonography of peripheral nerve injuries after an earthquake. Neural Regen Res 2014; 9:582-8. [PMID: 25206859 PMCID: PMC4146238 DOI: 10.4103/1673-5374.130095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/26/2014] [Indexed: 01/02/2023] Open
Abstract
Published data on earthquake-associated peripheral nerve injury is very limited. Ultrasonography has been proven to be efficient in the clinic to diagnose peripheral nerve injury. The aim of this study was to assess the role of ultrasound in the evaluation of persistent peripheral nerve injuries 1 year after the Wenchuan earthquake. Thirty-four patients with persistent clinical symptoms and neurologic signs of impaired nerve function were evaluated with sonography prior to surgical repair. Among 34 patients, ultrasonography showed that 48 peripheral nerves were entrapped, and 11 peripheral nerves were disrupted. There was one case of misdiagnosis on ultrasonography. The concordance rate of ultrasonographic findings with those of surgical findings was 98%. A total of 48 involved nerves underwent neurolysis and the symptoms resolved. Only five nerves had scar tissue entrapment. Preoperative and postoperative clinical and ultrasonographic results were concordant, which verified that ultrasonography is useful for preoperative diagnosis and postoperative evaluation of injured peripheral nerves.
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Affiliation(s)
- Man Lu
- Department of Ultrasound, Sichuan Provincial People's Hospital, Chengdu, Sichuan Province, China
| | - Yue Wang
- Department of Orthopedics, Sichuan Provincial People's Hospital, Chengdu, Sichuan Province, China
| | - Linxian Yue
- Department of Ultrasound, Sichuan Provincial People's Hospital, Chengdu, Sichuan Province, China
| | - Jack Chiu
- Department of Radiology, University Hospital, University of Western Ontario, Ontario, Canada
| | - Fanding He
- Department of Ultrasound, Sichuan Provincial People's Hospital, Chengdu, Sichuan Province, China
| | - Xiaojing Wu
- Department of Orthopedics, Sichuan Provincial People's Hospital, Chengdu, Sichuan Province, China
| | - Bin Zang
- Department of Orthopedics, Sichuan Provincial People's Hospital, Chengdu, Sichuan Province, China
| | - Bin Lu
- Department of Orthopedics, Sichuan Provincial People's Hospital, Chengdu, Sichuan Province, China
| | - Xiaoke Yao
- Department of Orthopedics, Sichuan Provincial People's Hospital, Chengdu, Sichuan Province, China
| | - Zirui Jiang
- Chengdu Jiaxiang Foreign Languages School, Chengdu, Sichuan Province, China
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