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https://www.readbyqxmd.com/read/29330414/partially-oxidized-polyvinyl-alcohol-conduitfor-peripheral-nerve-regeneration
#1
Elena Stocco, Silvia Barbon, Lucia Lora, Francesca Grandi, Leonardo Sartore, Cesare Tiengo, Lucia Petrelli, Daniele Dalzoppo, Pier Paolo Parnigotto, Veronica Macchi, Raffaele De Caro, Andrea Porzionato, Claudio Grandi
Surgical reconstruction of peripheral nerves injuries with wide substance-loss is still a challenge. Many studies focused on the development of artificial nerve conduits made of synthetic or biological materials but the ideal device has not yet been identified. Here, we manufactured a conduit for peripheral nerve regeneration using a novel biodegradable hydrogel we patented that is oxidized polyvinyl alcohol (OxPVA). Thus, its characteristics were compared with neat polyvinyl alcohol (PVA) and silk-fibroin (SF) conduits, through in vitro and in vivo analysis...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29330413/nerve-wrap-after-end-to-end-and-tension-free-neurorrhaphy-attenuates-neuropathic-pain-a-prospective-study-based-on-cohorts-of-digit-replantation
#2
Xiaozhong Zhu, Haifeng Wei, Hongyi Zhu
The repair of injured peripheral nerve is still challenging for surgeons. The end-to-end and tension-free neurorrhaphy is the current gold standard for reconstruction after complete nerve transection without significant defect. The main objective of this study neurorrhaphy in digit replantation affects the sensory recovery and neuropathic pain in replanted digit. Total 101 patients who received replantation of single completely amputated digit were included for analysis in this study. In group I (n = 49), the digital nerves were repaired with end-to-end and tension-free neurorrhaphy and then wrapped into a tendon-derived collagen nerve conduit...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29330037/sustained-delivery-of-glial-cell-derived-neurotrophic-factors-in-collagen-conduits-for-facial-nerve-regeneration
#3
Fukai Ma, Feng Xu, Ronggang Li, Yongtao Zheng, Fan Wang, Naili Wei, Junjie Zhong, Qisheng Tang, Tongming Zhu, Zhifu Wang, Jianhong Zhu
Facial nerve injury caused by traffic accidents or operations may reduce the quality of life in patients, and recovery following the injury presents unique clinical challenges. Glial cell-derived neurotrophic factor (GDNF) is important in nerve regeneration; however, soluble GDNF rapidly diffuses into body fluids, making it difficult to achieve therapeutic efficacy. In this work, we developed a rat tail derived collagen conduit to connect nerve defects in a simple and safe manner. GDNF was immobilized in the collagen conduits via chemical conjugation to enable controlled release of GDNF...
January 9, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29328458/chitosan-conduit-combined-with-hyaluronic-acid-prevent-sciatic-nerve-scar-in-a-rat-model-of-peripheral-nerve-crush-injury
#4
Runxin Li, Huawei Liu, Haitao Huang, Wenting Bi, Rongzeng Yan, Xinying Tan, Weisheng Wen, Chao Wang, Wenling Song, Yanhua Zhang, Feng Zhang, Min Hu
In the present study, the effects of hyaluronic acid (HA) combined with chitosan conduit on peripheral nerve scarring and regeneration were investigated in a rat model of peripheral nerve crush injury. A total of 60 Sprague-Dawley rats were randomly distributed into four groups (15 rats in each group), in which the nerve was either not treated (control group) or treated with chitosan conduit, hyaluronic acid, or chitosan conduit coupled with hyaluronic acid following clamp injury to the sciatic nerve. The surgical sites were evaluated by assessing the sciatic functional index, the degree of scar adhesions, the numbers of myelinated nerve fibers, the average diameter of myelinated nerve fibers and the myelin sheath thickness...
January 8, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29327452/regenerative-effects-of-human-embryonic-stem-cell-derived-neural-crest-cells-for-treatment-of-peripheral-nerve-injury
#5
Iwan Jones, Liudmila N Novikova, Lev N Novikov, Monika Renardy, Andreas Ullrich, Mikael Wiberg, Leif Carlsson, Paul J Kingham
Surgical intervention is the current gold standard treatment following peripheral nerve injury. However, this approach has limitations and full recovery of both motor and sensory modalities often remains incomplete. The development of artificial nerve grafts that either complement or replace current surgical procedures is therefore of paramount importance. An essential component of artificial grafts are biodegradable conduits and transplanted cells that provide trophic support during the regenerative process...
January 12, 2018: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29315828/a-collagen-coated-pga-conduit-for-interpositional-jump-graft-with-end-to-side-neurorrhaphy-for-treating-facial-nerve-paralysis-in-rat
#6
Yosuke Niimi, Hajime Matsumine, Yuichi Takeuchi, Hironobu Osaki, Satoshi Tsunoda, Mariko Miyata, Masayuki Yamato, Hiroyuki Sakurai
PURPOSE: This study investigated the potential of collagen-coated polyglycolic acid (PGA) tube with interpositional jump graft (IPJG) in rat. MATERIALS AND METHODS: A total of 16 Lewis rats were used in this study. Facial nerve paralysis was created by ligating facial nerve trunk with a ligature clip. The rats were divided into 3 groups. Nerve conduit group (n = 6) were treated by IPJG with collagen-coated PGA tubes between the facial nerve trunks and the hypoglossal nerves...
January 8, 2018: Microsurgery
https://www.readbyqxmd.com/read/29288689/skin-derived-precursor-schwann-cell-generated-acellular-matrix-modified-chitosan-silk-scaffolds-for-bridging-rat-sciatic-nerve-gap
#7
Changlai Zhu, Jing Huang, Chengbin Xue, Yaxian Wang, Shengran Wang, Shuangxi Bao, Ruyue Chen, Yuan Li, Yun Gu
Extracellular/acellular matrix has been attracted much research interests for its unique biological characteristics, and ACM modified neural scaffolds shows the remarkable role of promoting peripheral nerve regeneration. In this study, skin-derived precursors pre-differentiated into Schwann cells (SKP-SCs) were used as parent cells to generate acellular(ACM) for constructing a ACM-modified neural scaffold. SKP-SCs were co-cultured with chitosan nerve guidance conduits (NGC) and silk fibroin filamentous fillers, followed by decellularization to stimulate ACM deposition...
December 27, 2017: Neuroscience Research
https://www.readbyqxmd.com/read/29286961/regeneration-of-a-completely-transected-sciatic-nerve-with-use-of-a-bioabsorbable-nerve-conduit-filled-with-collagen-with-a-14-year-follow-up-a-case-report
#8
Yuji Inada, Keishichirou Moroi, Shigeru Morimoto, Takamitsu Fujikawa, Hiroshige Tateuchi, Tatsuo Nakamura
CASE: A 65-year-old man with a completely transected left sciatic nerve at the buttock received an implant with a bioabsorbable nerve conduit over a 20-mm gap. The conduit was filled with collagen to facilitate nerve regeneration. At 4 years after implantation, reinnervation potentials were detected in the muscles, and there was sensory recovery in the reinnervated areas. Thereafter, motor and sensory function recovered gradually over a 14-year period. CONCLUSION: Mixed nerve regeneration after conduit-based reconstruction was demonstrated objectively...
October 2017: JBJS Case Connector
https://www.readbyqxmd.com/read/29274478/a-compound-scaffold-with-uniform-longitudinally-oriented-guidance-cues-and-a-porous-sheath-promotes-peripheral-nerve-regeneration-in-vivo
#9
Liangliang Huang, Lei Zhu, Xiaowei Shi, Bing Xia, Zhongyang Liu, Shu Zhu, Yafeng Yang, Teng Ma, Pengzhen Cheng, Kai Luo, Jinghui Huang, Zhuojing Luo
Scaffolds with inner fillers that convey directional guidance cues represent promising candidates for nerve repair. However, incorrect positioning or non-uniform distribution of intraluminal fillers might result in regeneration failure. In addition, proper porosity (to enhance nutrient and oxygen exchange but prevent fibroblast infiltration) and mechanical properties (to ensure fixation and to protect regenerating axons from compression) of the outer sheath are also highly important for constructing advanced nerve scaffolds...
December 20, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29235541/biodegradable-bisvinyl-sulfonemethyl-crosslinked-gelatin-conduit-promotes-regeneration-after-peripheral-nerve-injury-in-adult-rats
#10
Chien-Hsin Ko, Ming-You Shie, Jia-Horng Lin, Yi-Wen Chen, Chun-Hsu Yao, Yueh-Sheng Chen
In our previous study, we found that gelatin-based materials exhibit good conductivity and are non-cytotoxic. In this study, gelatin was cross-linked with bisvinyl sulfonemethyl (BVSM) to fabricate a biodegradable conduit for peripheral nerve repair. First, BVSM on the prepared conduit was characterized to determine its mechanical properties and contact angle. The maximum tensile strength and water contact angle of the gelatin-BVSM conduits were 23 ± 4.8 MPa and 74.7 ± 9°, which provided sufficient mechanical strength to resist muscular contraction; additionally, the surface was hydrophilic...
December 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29234013/the-differentiation-stage-of-transplanted-stem-cells-modulates-nerve-regeneration
#11
Ching-Wen Huang, Wen-Chin Huang, Xuefeng Qiu, Flavia Fernandes Ferreira da Silva, Aijun Wang, Shyam Patel, Leon J Nesti, Mu-Ming Poo, Song Li
In regenerative medicine applications, the differentiation stage of implanted stem cells must be optimized to control cell fate and enhance therapeutic efficacy. We investigated the therapeutic potential of human induced pluripotent stem cell (iPSC)-derived cells at two differentiation stages on peripheral nerve regeneration. Neural crest stem cells (NCSCs) and Schwann cells (NCSC-SCs) derived from iPSCs were used to construct a tissue-engineered nerve conduit that was applied to bridge injured nerves in a rat sciatic nerve transection model...
December 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29229422/split-sciatic-nerve-surgery-a-new-microsurgical-model-in-experimental-nerve-repair
#12
Luigi Schiraldi, Lima Sottaz, Srinivas Madduri, Corrado Campisi, Carlo M Oranges, Wassim Raffoul, Daniel F Kalbermatten, Pietro G di Summa
INTRODUCTION: Sciatic experimental surgery in rat often leads to hindlimb autophagy, with considerable ethical and research issues. In this work, the distal part of the sciatic nerve was split following the natural bifurcation between tibial and peroneal branches, before applying regenerative stem cells in a fibrin conduit on the peroneal segment. The new microsurgical model was tested in terms of animal morbidity and consistency of research outcomes, particularly comparing to the standard total sciatic axotomy procedure...
November 28, 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/29220373/can-nerve-regeneration-on-an-artificial-nerve-conduit-be-enhanced-by-ethanol-induced-cervical-sympathetic-ganglion-block
#13
Yoshiki Shionoya, Katsuhisa Sunada, Keiji Shigeno, Akira Nakada, Michitaka Honda, Tatsuo Nakamura
This study aimed to determine whether nerve regeneration by means of an artificial nerve conduit is promoted by ethanol-induced cervical sympathetic ganglion block (CSGB) in a canine model. This study involved two experiments-in part I, the authors examined the effect of CSGB by ethanol injection on long-term blood flow to the orofacial region; part II involved evaluation of the effect of CSGB by ethanol injection on inferior alveolar nerve (IAN) repair using polyglycolic acid-collagen tubes. In part I, seven Beagles were administered left CSGB by injection of 99...
2017: PloS One
https://www.readbyqxmd.com/read/29208270/nano-fibrous-and-ladder-like-multi-channel-nerve-conduits-degradation-and-modification-by-gelatin
#14
Sheng Liu, Xiumin Sun, Tao Wang, Shihao Chen, Chen-Guang Zeng, Gaoyi Xie, Qingtang Zhu, Xiaolin Liu, Daping Quan
We recently fabricated multi-channel PLLA nerve conduits (NCs, conduits diameter: ~3mm, channels diameter: ~200μm) with nano-fibrous microstructure (NNCs) and ladder-like microstructure (LNCs), and found the nanofibers in the NNCs promote differentiation of nerve stem cells (NSCs) into neurons. In the present study, we evaluated the degradation profile of NNCs and LNCs, and observed that NNCs degraded too fast to implant. To delay the degradation and retain the nano-scale effect of NNCs, we used gelatin to wrap (2% w/v gelatin) or embed (8% w/v gelatin) NNCs and LNCs via vacuum infusion and chemical cross-linking with genipin...
February 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29206677/benchmarking-complications-associated-with-esophagectomy
#15
Donald E Low, Madhan Kumar Kuppusamy, Derek Alderson, Ivan Cecconello, Andrew C Chang, Gail Darling, Andrew Davies, Xavier Benoit D'Journo, Suzanne S Gisbertz, S Michael Griffin, Richard Hardwick, Arnulf Hoelscher, Wayne Hofstetter, Blair Jobe, Yuko Kitagawa, Simon Law, Christophe Mariette, Nick Maynard, Christopher R Morse, Philippe Nafteux, Manuel Pera, C S Pramesh, Sonia Puig, John V Reynolds, Wolfgang Schroeder, Mark Smithers, B P L Wijnhoven
OBJECTIVE: Utilizing a standardized dataset with specific definitions to prospectively collect international data to provide a benchmark for complications and outcomes associated with esophagectomy. SUMMARY OF BACKGROUND DATA: Outcome reporting in oncologic surgery has suffered from the lack of a standardized system for reporting operative results particularly complications. This is particularly the case for esophagectomy affecting the accuracy and relevance of international outcome assessments, clinical trial results, and quality improvement projects...
December 4, 2017: Annals of Surgery
https://www.readbyqxmd.com/read/29177170/effects-of-chitosan-zinc-oxide-nanocomposite-conduit-on-transected-sciatic-nerve-an-animal-model-study
#16
Maryam Iman, Mostafa Araghi, Yunes Panahi, Rahim Mohammadi
Objective: To determine the effects of chitosan-zinc oxide nanocomposite conduit on transected sciatic nerve in animal model of rat. Methods: Sixty male White Wistar rats were used in this study. A 10-mm sciatic nerve defect was bridged using a chitosan-zinc oxide nanocomposite conduit (CZON) filled with phosphate buffered saline. In chitosan group (CHIT) the chitosan conduit was filled with phosphate buffered saline solution. In sham-operated group (SHAM), sciatic nerve was exposed and manipulated...
October 2017: Bulletin of Emergency and Trauma
https://www.readbyqxmd.com/read/29177169/local-administration-of-methylprednisolone-laden-hydrogel-enhances-functional-recovery-of-transected-sciatic-nerve-in-rat
#17
Ali Mehrshad, Mohammad Shahraki, Shahin Ehteshamfar
Objective: To determine the effects of methylprednisolone-laden hydrogel loaded into a chitosan conduit on the functional recovery of peripheral nerve using a rat sciatic nerve regeneration model was assessed. Methods: 10-mm sciatic nerve defect was bridged using a chitosan conduit (CHIT/CGP-Hydrogel) filled with CGP-hydrogel. In authograft group (AUTO) a segment of sciatic nerve was transected and reimplanted reversely. In methylprednisolone treated group (CHIT/MP) the conduit was filled with methylprednisolone-laden CGP-hydrogel...
October 2017: Bulletin of Emergency and Trauma
https://www.readbyqxmd.com/read/29174858/visualized-evaluation-of-blood-flow-to-the-gastric-conduit-and-complications-in-esophageal-reconstruction
#18
Kazuhiro Noma, Yasuhiro Shirakawa, Nobuhiko Kanaya, Tsuyoshi Okada, Naoaki Maeda, Takayuki Ninomiya, Shunsuke Tanabe, Kazufumi Sakurama, Toshiyoshi Fujiwara
BACKGROUND: Evaluation of the blood supply to gastric conduits is critically important to avoid complications following esophagectomy. We commenced visualized evaluation of blood flow using indocyanine green (ICG) fluorescent imaging from July 2015, to reduce reconstructive complications. In this study, we aimed to statistically verify the efficacy of blood flow evaluation using our simplified ICG method. STUDY DESIGN: A total of 285 consecutive patients who underwent esophagectomy and gastric conduit reconstruction were reviewed and divided into two groups: before and after introduction of ICG evaluation...
November 22, 2017: Journal of the American College of Surgeons
https://www.readbyqxmd.com/read/29166306/the-surgical-management-of-nerve-gaps-present-and-future
#19
Samer Bassilios Habre, Grant Bond, Xi Lin Jing, Epameinondas Kostopoulos, Robert D Wallace, Petros Konofaos
Peripheral nerve injuries can result in significant morbidity, including motor and/or sensory loss, which can affect significantly the life of the patient. Nowadays, the gold standard for the treatment of nerve section is end-to-end neurorrhaphy. Unfortunately, in some cases, there is segmental loss of the nerve trunk. Nerve mobilization allows primary repair of the sectioned nerve by end-to-end neurorrhaphy if the gap is less than 1 cm. When the nerve gap exceeds 1 cm, autologous nerve grafting is the gold standard of treatment...
November 21, 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/29160628/the-role-of-chitin-and-chitosan-in-peripheral-nerve-reconstruction
#20
REVIEW
Michał Bąk, Olga N Gutkowska, Ewa Wagner, Jerzy Gosk
Chitin is a natural polysaccharide commonly found in nature and chitosan is its partially deacetylated derivative. The properties of both biopolymers allow their wide use in medicine and various industries. This paper presents the possibilities offered by chitin and chitosan for the creation of neurotubes utilized in peripheral nerve repair procedures. In the initial part of this manuscript, experimental studies on both polysaccharides carried out by numerous authors have been presented and their results have been discussed...
January 2017: Polimery W Medycynie
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