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Reduced graphene oxide-embedded nerve conduits loaded with bone marrow mesenchymal stem cell-derived extracellular vesicles promote peripheral nerve regeneration 被引量:4
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作者 Wei Zhang Xing-Xing Fang +2 位作者 Qi-Cheng Li Wei Pi Na Han 《Neural Regeneration Research》 SCIE CAS CSCD 2023年第1期200-206,共7页
We previously combined reduced graphene oxide(rGO)with gelatin-methacryloyl(GelMA)and polycaprolactone(PCL)to create an rGO-GelMA-PCL nerve conduit and found that the conductivity and biocompatibility were improved.Ho... We previously combined reduced graphene oxide(rGO)with gelatin-methacryloyl(GelMA)and polycaprolactone(PCL)to create an rGO-GelMA-PCL nerve conduit and found that the conductivity and biocompatibility were improved.However,the rGO-GelMA-PCL nerve conduits differed greatly from autologous nerve transplants in their ability to promote the regeneration of injured peripheral nerves and axonal sprouting.Extracellular vesicles derived from bone marrow mesenchymal stem cells(BMSCs)can be loaded into rGO-GelMA-PCL nerve conduits for repair of rat sciatic nerve injury because they can promote angiogenesis at the injured site.In this study,12 weeks after surgery,sciatic nerve function was measured by electrophysiology and sciatic nerve function index,and myelin sheath and axon regeneration were observed by electron microscopy,immunohistochemistry,and immunofluorescence.The regeneration of microvessel was observed by immunofluorescence.Our results showed that rGO-GelMA-PCL nerve conduits loaded with BMSC-derived extracellular vesicles were superior to rGO-GelMA-PCL conduits alone in their ability to increase the number of newly formed vessels and axonal sprouts at the injury site as well as the recovery of neurological function.These findings indicate that rGO-GelMA-PCL nerve conduits loaded with BMSC-derived extracellular vesicles can promote peripheral nerve regeneration and neurological function recovery,and provide a new direction for the curation of peripheral nerve defect in the clinic. 展开更多
关键词 ANGIOGENESIS AXON bone mesenchymal stem cell extracellular vesicles hybrid nanofibers myelin sheath nerve conduit neurological function peripheral nerve injury reduced graphene oxide
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Construction of a three-dimensional bionic nerve conduit containing two neurotrophic factors with separate delivery systems for the repair of sciatic nerve defects 被引量:3
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作者 Zhiyue Li Qun Zhao +2 位作者 Ran Bi Yong Zhuang Siyin Feng 《Neural Regeneration Research》 SCIE CAS CSCD 2011年第13期988-994,共7页
Previous studies of nerve conduits have investigated numerous properties, such as conduit luminal structure and neurotrophic factor incorporation, for the regeneration of nerve defects. The present study used a poly(... Previous studies of nerve conduits have investigated numerous properties, such as conduit luminal structure and neurotrophic factor incorporation, for the regeneration of nerve defects. The present study used a poly(lactic-co-glycolic acid) (PLGA) copolymer to construct a three-dimensional (3D) bionic nerve conduit, with two channels and multiple microtubule lumens, and incorporating two neurotrophic factors, each with their own delivery system, as a novel environment for peripheral nerve regeneration. The efficacy of this conduit in repairing a 1.5 cm sciatic nerve defect was compared with PLGA-alone and PLGA-microfilament conduits, and autologous nerve transplantation. Results showed that compared with the other groups, the 3D bionic nerve conduit had the fastest nerve conduction velocity, largest electromyogram amplitude, and shortest electromyogram latency. In addition, the nerve fiber density, myelin sheath thickness and axon diameter were significantly increased, and the recovery rate of the triceps surae muscle wet weight was lowest. These findings suggest that 3D bionic nerve conduits can provide a suitable microenvironment for peripheral nerve regeneration to efficiently repair sciatic nerve defects. p 展开更多
关键词 oly(lactic-co-glycolic acid) sciatic nerve defect nerve conduit BIONICS nerve tissue engineering neural regeneration
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A novel bioactive nerve conduit for the repair of peripheral nerve injury 被引量:3
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作者 Bin-bin Li Yi-xia Yin +2 位作者 Qiong-jiao Yan Xin-yu Wang Shi-pu Li 《Neural Regeneration Research》 SCIE CAS CSCD 2016年第1期150-155,共6页
The use of a nerve conduit provides an opportunity to regulate cytokines,growth factors and neurotrophins in peripheral nerve regeneration and avoid autograft defects.We constructed a poly-D-L-lactide(PDLLA)-based ner... The use of a nerve conduit provides an opportunity to regulate cytokines,growth factors and neurotrophins in peripheral nerve regeneration and avoid autograft defects.We constructed a poly-D-L-lactide(PDLLA)-based nerve conduit that was modified using poly{(lactic acid)-co-[(glycolic acid)-alt-(L-lysine)]}andβ-tricalcium phosphate.The effectiveness of this bioactive PDLLA-based nerve conduit was compared to that of PDLLA-only conduit in the nerve regeneration following a 10-mm sciatic nerve injury in rats.We observed the nerve morphology in the early period of regeneration,35 days post injury,using hematoxylin-eosin and methylene blue staining.Compared with the PDLLA conduit,the nerve fibers in the PDLLA-based bioactive nerve conduit were thicker and more regular in size.Muscle fibers in the soleus muscle had greater diameters in the PDLLA bioactive group than in the PDLLA only group.The PDLLA-based bioactive nerve conduit is a promising strategy for repair after sciatic nerve injury. 展开更多
关键词 nerve regeneration polylactic acid poly{(lactic acid)-co-[(glycolic acid)-alt-(L-lysine)]} β-tricalcium phosphate nerve conduit nerve fiber neural regeneration
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Biological and artificial nerve conduit for repairing peripheral nerve defect 被引量:1
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作者 Xuetao Xie Changqing Zhang 《Neural Regeneration Research》 SCIE CAS CSCD 2006年第4期372-374,共3页
OBJECTIVE: Recently, with the development of biological and artificial materials, the experimental and clinical studies on application of this new material-type nerve conduit for treatment of peripheral nerve defect ... OBJECTIVE: Recently, with the development of biological and artificial materials, the experimental and clinical studies on application of this new material-type nerve conduit for treatment of peripheral nerve defect have become the hotspot topics for professorial physicians. DATA SOURCES : Using the terms "nerve conduits, peripheral nerve, nerve regeneration and nerve transplantation" in English, we searched Pubmed database, which was published during January 2000 to June 2006, for the literatures related to repairing peripheral nerve defect with various materials. At the same time, we also searched Chinese Technical Scientific Periodical Database at the same time period by inputting " peripheral nerve defect, nerve repair, nerve regeneration and nerve graft" in Chinese. STUDY SELECTION : The materials were firstly selected, and literatures about study on various materials for repairing peripheral nerve defect and their full texts were also searched. Inclusive criteria: nerve conduits related animal experiments and clinical studies. Exclusive criteria: review or repetitive studies. DATA EXTRACTION: Seventy-nine relevant literatures were collected and 30 of them met inclusive criteria and were cited. DATA SYNTHESIS : Peripheral nerve defect, a commonly seen problem in clinic, is difficult to be solved. Autogenous nerve grafting is still the gold standard for repairing peripheral nerve defect, but because of its application limitation and possible complications, people studied nerve conduits to repair nerve defect. Nerve conduits consist of biological and artificial materials. CONCLUSION: There have been numerous reports about animal experimental and clinical studies of various nerve conduits, but nerve conduit, which is more ideal than autogenous nerve grafting, needs further clinical observation and investigation. 展开更多
关键词 Biological and artificial nerve conduit for repairing peripheral nerve defect
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Ultrasound imaging of chitosan nerve conduits that bridge sciatic nerve defects in rats 被引量:1
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作者 Xiaoyang Chen Yifei Yin +4 位作者 Tingting Zhang Yahong Zhao Yumin Yang Xiaomei Yu Hongkui Wang 《Neural Regeneration Research》 SCIE CAS CSCD 2014年第14期1386-1388,共3页
The repair of peripheral nerve injuries with autologous nerve remains the gold standard (Wang et al., 2005; Yao et al., 2010; Deal et al., 2012; Kriebel et al., 2014; Liu et al., 2014; Tamaki et al., 2014; Yu et al.,... The repair of peripheral nerve injuries with autologous nerve remains the gold standard (Wang et al., 2005; Yao et al., 2010; Deal et al., 2012; Kriebel et al., 2014; Liu et al., 2014; Tamaki et al., 2014; Yu et al., 2014; Zhu and Lou, 2014). With advances in tissue engineering and biomaterials, tissue-engineered nerve conduits with various biomaterials and structures, such as collagen and chitosan nerve conduits, have already been used in the clinic as alternatives to autologous nerve in the repair of peripheral nerve injury (Wang et al., 2012; Svizenska et al., 2013; Eppenberger et al., 2014; Gu et al., 2014; Koudehi et al., 2014; MoyaDiaz et al., 2014; Novajra et al., 2014; Okamoto et al., 2014; Shea et al., 2014; Singh et al., 2014; Tamaki et al., 2014; Yu et al., 2014). Therefore, new simple and effective methods 展开更多
关键词 Ultrasound imaging of chitosan nerve conduits that bridge sciatic nerve defects in rats
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Use of nerve conduits for peripheral nerve injury repair:A Web of Science-based literature analysis
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作者 Jinniang Nan Xuguang Hu +2 位作者 Hongxiu Li Xiaonong Zhang Renjing Piao 《Neural Regeneration Research》 SCIE CAS CSCD 2012年第35期2826-2833,共8页
OBJECTIVE: To identify global research trends in the use of nerve conduits for peripheral nerve injury repair. DATA RETRIEVAL: Numerous basic and clinical studies on nerve conduits for peripheral nerve injury repair... OBJECTIVE: To identify global research trends in the use of nerve conduits for peripheral nerve injury repair. DATA RETRIEVAL: Numerous basic and clinical studies on nerve conduits for peripheral nerve injury repair were performed between 2002-2011. We performed a bibliometric analysis of the institutions, authors, and hot topics in the field, from the Web of Science, using the key words peripheral nerve and conduit or tube. SELECTION CRITERIA: Inclusion criteria: peer-reviewed published articles on nerve conduits for peripheral nerve injury repair, indexed in the Web of Science; original research articles, reviews, meeting abstracts, proceedings papers, book chapters, editorial material, and news items. Exclusion criteria: articles requiring manual searching or telephone access; documents not published in the public domain; and several corrected papers. MAIN OUTCOME MEASURES: (a) Annual publication output; (b) publication type; (c) publication by research field; (d) publication by journal; (e) publication by funding agency; (f) publication by author; (g) publication by country and institution; (h) publications by institution in China; (i) most-cited papers. RESULTS: A total of 793 publications on the use of nerve conduits for peripheral nerve injury repair were retrieved from the Web of Science between 2002-2011. The number of publications gradually increased over the 10-year study period. Articles constituted the main type of publication. The most prolific journals were Biomaterials, Microsurge and Joumal of Biomedical Materials Research PartA. The National Natural Science Foundation of China supported 27 papers, more than any other funding agency. Of the 793 publications, almost half came from American and Chinese authors and institutions. CONCLUSION: Nerve conduits have been studied extensively for peripheral nerve regeneration; however, many problems remain in this field, which are difficult for researchers to reach a consensus. 展开更多
关键词 nerve conduit biomaterial AXON neurotrophic factor stem cell extracellular matrix peripheralnerve injury peripheral nerve repair degradation BIOCOMPATIBILITY neural regeneration
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Roles of reinforced nerve conduits and low-level laser phototherapy for long gap peripheral nerve repair
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作者 Bai-Shuan Liu Tsung-Bin Huang Shiuh-Chuan Chan 《Neural Regeneration Research》 SCIE CAS CSCD 2014年第12期1180-1182,共3页
Peripheral nerve injuries are common in clinical practice because of traumas such as crushing and sectioning. Lesions of the nerve structure result in lost or diminished sensitivity and/or motor activity in the innerv... Peripheral nerve injuries are common in clinical practice because of traumas such as crushing and sectioning. Lesions of the nerve structure result in lost or diminished sensitivity and/or motor activity in the innervated territory. The degree of lesion depends on the specific nerve involved, the magnitude and type of pres- sure exerted, and the duration of the compression. The results of such injuries commonly include axonal degeneration and retro- grade degeneration of the corresponding neurons in the spinal medulla, followed by very slow regeneration (Rochkind et al., 2001). The adverse effects on the daily activities of patients with a peripheral nerve injury are a determining factor in establishing the goals of early recovery (Rodriguez et al., 2004). 展开更多
关键词 Roles of reinforced nerve conduits and low-level laser phototherapy for long gap peripheral nerve repair GGT
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Silk Nerve Conduits for Peripheral Nerve Regeneration
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作者 Jieping WANG Xiangxia ZHANG +3 位作者 Jinfeng LYU Yao ZENG Shanlin GU Chan ZHOU 《Agricultural Biotechnology》 CAS 2022年第6期155-157,共3页
Silk can promote the penetration of oxygen and water and support the attachment and proliferation of neurons and Schwann cells,and has appropriate biodegradation kinetics and flexible physical strength.It is a high-qu... Silk can promote the penetration of oxygen and water and support the attachment and proliferation of neurons and Schwann cells,and has appropriate biodegradation kinetics and flexible physical strength.It is a high-quality natural tissue engineering material and can be used as an ideal matrix for nerve repair.This paper reviewed the structure and properties of silk and the research progress of silk nerve conduits in peripheral nerve regeneration in recent years,and prospected its clinical application. 展开更多
关键词 Peripheral nerve injury nerve regeneration SILK nerve conduit
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Growth Factors and Supporting Cells of Nerve Conduits for Peripheral Nerve Regeneration
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作者 Yang XIANG Zhi-Wu CHEN +3 位作者 Jun-Shui ZHENG Zhuan YANG Guang-Hao LIN Peng WEI 《Chinese Journal of Plastic and Reconstructive Surgery》 2019年第4期46-54,共9页
Peripheral nerve injury is a common disease that endangers human health.There is a variety of methods to repair peripheral nerve injury,the current"gold standard"approach is autograft,however it still faces ... Peripheral nerve injury is a common disease that endangers human health.There is a variety of methods to repair peripheral nerve injury,the current"gold standard"approach is autograft,however it still faces many disadvantages.A new choice is the use of artificial nerve conduits,which are tubular structures and are designed to bridge nerve gaps.In order to bridge longer nerve gaps and gain ideal nerve regeneration effects,multiple technologies have been developed to the design of nerve conduits,such as selecting sutible materials,supplementing growth factors,transplanting supporting cells and so on.This review mainly introduce current progess in growth factors supplementation and supporting cells transplantation technology of nerve conduits. 展开更多
关键词 peripheral nerve injury nerve conduits growth factors supporting cells
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Human umbilical cord mesenchymal stem cell-derived exosomes loaded into a composite conduit promote functional recovery after peripheral nerve injury in rats 被引量:2
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作者 Haoshuai Tang Junjin Li +6 位作者 Hongda Wang Jie Ren Han Ding Jun Shang Min Wang Zhijian Wei Shiqing Feng 《Neural Regeneration Research》 SCIE CAS CSCD 2024年第4期900-907,共8页
Complete transverse injury of peripheral nerves is challenging to treat.Exosomes secreted by human umbilical cord mesenchymal stem cells are considered to play an important role in intercellular communication and regu... Complete transverse injury of peripheral nerves is challenging to treat.Exosomes secreted by human umbilical cord mesenchymal stem cells are considered to play an important role in intercellular communication and regulate tissue regeneration.In previous studies,a collagen/hyaluronic acid sponge was shown to provide a suitable regeneration environment for Schwann cell proliferation and to promote axonal regeneration.This three-dimensional(3D)composite conduit contains a collagen/hyaluronic acid inner sponge enclosed in an electrospun hollow poly(lactic-co-glycolic acid)tube.However,whether there is a synergy between the 3D composite conduit and exosomes in the repair of peripheral nerve injury remains unknown.In this study,we tested a comprehensive strategy for repairing long-gap(10 mm)peripheral nerve injury that combined the 3D composite conduit with human umbilical cord mesenchymal stem cell-derived exosomes.Repair effectiveness was evaluated by sciatic functional index,sciatic nerve compound muscle action potential recording,recovery of muscle mass,measuring the cross-sectional area of the muscle fiber,Masson trichrome staining,and transmission electron microscopy of the regenerated nerve in rats.The results showed that transplantation of the 3D composite conduit loaded with human umbilical cord mesenchymal stem cell-derived exosomes promoted peripheral nerve regeneration and restoration of motor function,similar to autograft transplantation.More CD31-positive endothelial cells were observed in the regenerated nerve after transplantation of the loaded conduit than after transplantation of the conduit without exosomes,which may have contributed to the observed increase in axon regeneration and distal nerve reconnection.Therefore,the use of a 3D composite conduit loaded with human umbilical cord mesenchymal stem cell-derived exosomes represents a promising cell-free therapeutic option for the treatment of peripheral nerve injury. 展开更多
关键词 axon growth collagen EXOSOME human umbilical cord mesenchymal stem cells hyaluronic acid muscular atrophy nerve guidance conduits peripheral nerve regeneration
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A novel flexible nerve guidance conduit promotes nerve regeneration while providing excellent mechanical properties
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作者 Tong Li Quhan Cheng +11 位作者 Jingai Zhang Boxin Liu Yu Shi Haoxue Wang Lijie Huang Su Zhang Ruixin Zhang Song Wang Guangxu Lu Peifu Tang Zhongyang Liu Kai Wang 《Neural Regeneration Research》 SCIE CAS 2025年第7期2084-2094,共11页
Autografting is the gold standard for surgical repair of nerve defects>5 mm in length;however,autografting is associated with potential complications at the nerve donor site.As an alternative,nerve guidance conduit... Autografting is the gold standard for surgical repair of nerve defects>5 mm in length;however,autografting is associated with potential complications at the nerve donor site.As an alternative,nerve guidance conduits may be used.The ideal conduit should be flexible,resistant to kinks and lumen collapse,and provide physical cues to guide nerve regeneration.We designed a novel flexible conduit using electrospinning technology to create fibers on the innermost surface of the nerve guidance conduit and employed melt spinning to align them.Subsequently,we prepared disordered electrospun fibers outside the aligned fibers and helical melt-spun fibers on the outer wall of the electrospun fiber lumen.The presence of aligned fibers on the inner surface can promote the extension of nerve cells along the fibers.The helical melt-spun fibers on the outer surface can enhance resistance to kinking and compression and provide stability.Our novel conduit promoted nerve regeneration and functional recovery in a rat sciatic nerve defect model,suggesting that it has potential for clinical use in human nerve injuries. 展开更多
关键词 aligned fibers anti-kinking helical fibers nerve guidance conduit nerve regeneration peripheral nerve injury topological guidance
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Silk-based nerve guidance conduits with macroscopic holes modulate the vascularization of regenerating rat sciatic nerve
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作者 Carina Hromada Patrick Heimel +10 位作者 Markus Kerbl LászlóGál Sylvia Nürnberger Barbara Schaedl James Ferguson Nicole Swiadek Xavier Monforte Johannes C.Heinzel Antal Nógrádi Andreas H.Teuschl-Woller David Hercher 《Neural Regeneration Research》 SCIE CAS 2025年第6期1789-1800,共12页
Peripheral nerve injuries induce a severe motor and sensory deficit. Since the availability of autologous nerve transplants for nerve repair is very limited, alternative treatment strategies are sought, including the ... Peripheral nerve injuries induce a severe motor and sensory deficit. Since the availability of autologous nerve transplants for nerve repair is very limited, alternative treatment strategies are sought, including the use of tubular nerve guidance conduits(tNGCs). However, the use of tNGCs results in poor functional recovery and central necrosis of the regenerating tissue, which limits their application to short nerve lesion defects(typically shorter than 3 cm). Given the importance of vascularization in nerve regeneration, we hypothesized that enabling the growth of blood vessels from the surrounding tissue into the regenerating nerve within the tNGC would help eliminate necrotic processes and lead to improved regeneration. In this study, we reported the application of macroscopic holes into the tubular walls of silk-based tNGCs and compared the various features of these improved silk^(+) tNGCs with the tubes without holes(silk^(–) tNGCs) and autologous nerve transplants in an 8-mm sciatic nerve defect in rats. Using a combination of micro-computed tomography and histological analyses, we were able to prove that the use of silk^(+) tNGCs induced the growth of blood vessels from the adjacent tissue to the intraluminal neovascular formation. A significantly higher number of blood vessels in the silk^(+) group was found compared with autologous nerve transplants and silk^(–), accompanied by improved axon regeneration at the distal coaptation point compared with the silk^(–) tNGCs at 7 weeks postoperatively. In the 15-mm(critical size) sciatic nerve defect model, we again observed a distinct ingrowth of blood vessels through the tubular walls of silk^(+) tNGCs, but without improved functional recovery at 12 weeks postoperatively. Our data proves that macroporous tNGCs increase the vascular supply of regenerating nerves and facilitate improved axonal regeneration in a short-defect model but not in a critical-size defect model. This study suggests that further optimization of the macroscopic holes silk^(+) tNGC approach containing macroscopic holes might result in improved grafting technology suitable for future clinical use. 展开更多
关键词 axon regeneration blood vessel functional recovery macroporous nerve lesion peripheral nerve repair sciatic nerve silk-based nerve guidance conduit VASCULARIZATION
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A hyaluronic acid granular hydrogel nerve guidance conduit promotes regeneration and functional recovery of injured sciatic nerves in rats 被引量:4
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作者 Jie Yang Chia-Chen Hsu +3 位作者 Ting-Ting Cao Hua Ye Jing Chen Yun-Qing Li 《Neural Regeneration Research》 SCIE CAS CSCD 2023年第3期657-663,共7页
A hyaluronic acid granular hydrogel can promote neuronal and astrocyte colony formation and axonal extension in vitro,suggesting that the hydrogel can simulate an extracellular matrix structure to promote neural regen... A hyaluronic acid granular hydrogel can promote neuronal and astrocyte colony formation and axonal extension in vitro,suggesting that the hydrogel can simulate an extracellular matrix structure to promote neural regeneration.However,in vivo experiments have not been conducted.In this study,we transplanted a hyaluronic acid granular hydrogel nerve guidance conduit to repair a 10-mm long sciatic nerve gap.The Basso,Beattie,and Bresnahan locomotor rating scale,sciatic nerve compound muscle action potential recording,Fluoro-Gold retrograde tracing,growth related protein 43/S100 immunofluorescence staining,transmission electron microscopy,gastrocnemius muscle dry/wet weight ratio,and Masson’s trichrome staining results showed that the nerve guidance conduit exhibited similar regeneration of sciatic nerve axons and myelin sheath,and recovery of the electrophysiological function and motor function as autologous nerve transplantation.The conduit results were superior to those of a bulk hydrogel or silicone tube transplant.These findings suggest that tissue-engineered nerve conduits containing hyaluronic acid granular hydrogels effectively promote the morphological and functional recovery of the injured sciatic nerve.The nerve conduits have the potential as a material for repairing peripheral nerve defects. 展开更多
关键词 functional recovery granular hydrogel hyaluronic acid myelin sheath nerve conduit nerve regeneration peripheral nerve regeneration sciatic nerve injury tissue engineering transection injury
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Electrodeposition of chitosan/graphene oxide conduit to enhance peripheral nerve regeneration 被引量:3
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作者 Ya-Nan Zhao Ping Wu +6 位作者 Zi-Yuan Zhao Fei-Xiang Chen Ao Xiao Zhi-Yi Yue Xin-Wei Han Yong Zheng Yun Chen 《Neural Regeneration Research》 SCIE CAS CSCD 2023年第1期207-212,共6页
Currently available commercial nerve guidance conduits have been applied in the repair of peripheral nerve defects.However,a conduit exhibiting good biocompatibility remains to be developed.In this work,a series of ch... Currently available commercial nerve guidance conduits have been applied in the repair of peripheral nerve defects.However,a conduit exhibiting good biocompatibility remains to be developed.In this work,a series of chitosan/graphene oxide(GO)films with concentrations of GO varying from 0-1 wt%(collectively referred to as CHGF-n)were prepared by an electrodeposition technique.The effects of CHGF-n on proliferation and adhesion abilities of Schwann cells were evaluated.The results showed that Schwann cells exhibited elongated spindle shapes and upregulated expression of nerve regeneration-related factors such as Krox20(a key myelination factor),Zeb2(essential for Schwann cell differentiation,myelination,and nerve repair),and transforming growth factorβ(a cytokine with regenerative functions).In addition,a nerve guidance conduit with a GO content of 0.25%(CHGFC-0.25)was implanted to repair a 10-mm sciatic nerve defect in rats.The results indicated improvements in sciatic functional index,electrophysiology,and sciatic nerve and gastrocnemius muscle histology compared with the CHGFC-0 group,and similar outcomes to the autograft group.In conclusion,we provide a candidate method for the repair of peripheral nerve defects using free-standing chitosan/GO nerve conduits produced by electrodeposition. 展开更多
关键词 CHITOSAN ELECTRODEPOSITION FREE-STANDING graphene oxide nerve conduit nerve factors Schwann cells tissue engineerin
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Construction of a mineralized collagen nerve conduit for peripheral nerve injury repair
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作者 Guman Duan Chengli Li +7 位作者 Xiaoqing Yan Shuhui Yang Shuo Wang Xiaodan Sun Lingyun Zhao Tianxi Song Yongwei Pan Xiumei Wang 《Regenerative Biomaterials》 SCIE EI CSCD 2023年第1期81-96,共16页
A new nerve guidance conduits(NGCs)named MC@Col containing Type I collagen(Col)and mineralized collagen(MC)was developed,enhancing mechanical and degradation behavior.The physicochemical properties,the mechanical prop... A new nerve guidance conduits(NGCs)named MC@Col containing Type I collagen(Col)and mineralized collagen(MC)was developed,enhancing mechanical and degradation behavior.The physicochemical properties,the mechanical properties and in vitro degradation behavior were all evaluated.The adhesion and proliferation of Schwann cells(SCs)were observed.In the in vivo experiment,MC@Col NGC and other conduits including Col,chitosan(CST)and polycaprolactone(PCL)conduit were implanted to repair a 10-mm-long Sprague-Dawley rat’s sciatic nerve defect.Histological analyses,morphological analyses,electrophysiological analyses and further gait analyses were all evaluated after implantation in 12 weeks.The strength and degradation performance of the MC@Col NGC were improved by the addition of MC in comparison with pure Col NGC.In vitro cytocompatibility evaluation revealed that the SCs had good viability,attachment and proliferation in the MC@Col.In in vivo results,the regenerative outcomes of MC@Col NGC were close to those by an autologous nerve graft in some respects,but superior to those by Col,CST and PCL conduits.The MC@Col NGC exhibited good mechanical performance as well as biocompatibility to bridge nerve gap and guide nerve regeneration,thus showing great promising potential as a new type of conduit in clinical applications. 展开更多
关键词 nerve guidance conduit COLLAGEN mineralized collagen peripheral nerve regeneration
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Chitosan conduits combined with nerve growth factor microspheres repair facial nerve defects 被引量:21
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作者 Huawei Liu Weisheng Wen +5 位作者 Min Hu Wenting Bi Lijie Chen Sanxia Liu Peng Chen Xinying Tan 《Neural Regeneration Research》 SCIE CAS CSCD 2013年第33期3139-3147,共9页
Microspheres containing nerve growth factor for sustained release were prepared by a compound method, and implanted into chitosan conduits to repair 10-mm defects on the right buccal branches of the facial nerve in ra... Microspheres containing nerve growth factor for sustained release were prepared by a compound method, and implanted into chitosan conduits to repair 10-mm defects on the right buccal branches of the facial nerve in rabbits. In addition, chitosan conduits combined with nerve growth factor or normal saline, as well as autologous nerve, were used as controls. At 90 days post-surgery, the muscular atrophy on the right upper lip was more evident in the nerve growth factor and normal sa- line groups than in the nerve growth factor-microspheres and autologous nerve groups. Electro- physiological analysis revealed that the nerve conduction velocity and amplitude were significantly higher in the nerve growth factor-microspheres and autologous nerve groups than in the nerve growth factor and normal saline groups. Moreover, histological observation illustrated that the di- ameter, number, alignment and myelin sheath thickness of myelinated nerves derived from rabbits were higher in the nerve growth factor-microspheres and autologous nerve groups than in the nerve growth factor and normal saline groups. These findings indicate that chitosan nerve conduits com- bined with microspheres for sustained release of nerve growth factor can significantly improve facial nerve defect repair in rabbits. 展开更多
关键词 neural regeneration peripheral newe injury tissue engineering newe growth factor microspherefacial nerve defect CHITOSAN nerve conduit grants-suppoSed paper NEUROREGENERATION
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Peripheral nerve regeneration with conduits:use of vein tubes 被引量:7
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作者 Rodrigo Guerra Sabongi Marcela Fernandes Joao Baptista Gomes dos Santos 《Neural Regeneration Research》 SCIE CAS CSCD 2015年第4期529-533,共5页
Treatment of peripheral nerve injuries remains a challenge to modern medicine due to the com-plexity of the neurobiological nerve regenerating process. There is a greater challenge when the transected nerve ends are n... Treatment of peripheral nerve injuries remains a challenge to modern medicine due to the com-plexity of the neurobiological nerve regenerating process. There is a greater challenge when the transected nerve ends are not amenable to primary end-to-end tensionless neurorraphy. When facing a segmental nerve defect, great effort has been made to develop an alternative to the au-tologous nerve graft in order to circumvent morbidity at donor site, such as neuroma formation, scarring and permanent loss of function. Tubolization techniques have been developed to bridge nerve gaps and have been extensively studied in numerous experimental and clinical trials. The use of a conduit intends to act as a vehicle for moderation and modulation of the cellular and molecular ambience for nerve regeneration. Among several conduits, vein tubes were validated for clinical application with improving outcomes over the years. This article aims to address the investigation and treatment of segmental nerve injury and draw the current panorama on the use of vein tubes as an autogenous nerve conduit. 展开更多
关键词 peripheral nerve injury nerve graft nerve conduit Wallerian degeneration neurotrophic factors VEINS AUTOGRAFTS nerve regeneration
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Fabrication and Characterization of Chitosan Nerve Conduits with Microtubular Architectures 被引量:7
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作者 敖强 王爱军 +4 位作者 曹文灵 赵畅 公衍道 赵南明 张秀芳 《Tsinghua Science and Technology》 SCIE EI CAS 2005年第4期435-438,共4页
Porous multi-channel chitosan conduits were fabricated using a novel phase-separation technique with an axial temperature gradient. First, porous chitosan tubes were made with a mold that was composed of two concentri... Porous multi-channel chitosan conduits were fabricated using a novel phase-separation technique with an axial temperature gradient. First, porous chitosan tubes were made with a mold that was composed of two concentric polytetrafiuoroethylene tubes. Then 1%-3% (w/v) chitosan solution was injected into the chitosan tube while the two ends of the tube were closed with steel rods. Then the outside of the tube was wrapped with a layer of thermal insulating material to reduce the heat transfer through the outside, and the tubes were placed in a freezer. The resulting phase separation then occurred in the presence of an axial temperature gradient. The porosity, microtubule diameter, and orientation were controlled by adjusting the polymer concentration and temperature gradient. After the preparation course, no poisonous substances remained on the conduits. The mechanical properties, swelling, and biodegradability of the chitosan conduits were investigated, and a scanning electron microscope was used to observe the tubular morphology and growth of neuroblastoma cells (N2A, mouse) in the conduits. The results demonstrate that the multi-channel chitosan conduits have suitable mechanical strength, swelling, degradation properties, and nerve cell affinity, so they hold promise for use as neural tissue engineering scaffolds. 展开更多
关键词 nerve conduits tissue engineering CHITOSAN phase separation
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Decellularized sciatic nerve matrix as a biodegradable conduit for peripheral nerve regeneration 被引量:5
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作者 Jongbae Choi Jun Ho Kim +3 位作者 Ji Wook Jang Hyun Jung Kim Sung Hoon Choi Sung Won Kwon 《Neural Regeneration Research》 SCIE CAS CSCD 2018年第10期1796-1803,共8页
The use of autologous nerve grafts remains the gold standard for treating nerve defects, but current nerve repair techniques are limited by donor tissue availability and morbidity associated with tissue loss. Recently... The use of autologous nerve grafts remains the gold standard for treating nerve defects, but current nerve repair techniques are limited by donor tissue availability and morbidity associated with tissue loss. Recently, the use of conduits in nerve injury repair, made possible by tissue engineering, has shown therapeutic potential. We manufactured a biodegradable, collagen-based nerve conduit containing decellularized sciatic nerve matrix and compared this with a silicone conduit for peripheral nerve regeneration using a rat model. The collagen-based conduit contains nerve growth factor, brain-derived neurotrophic factor, and laminin, as demonstrated by enzyme-linked immunosorbent assay. Scanning electron microscopy images showed that the collagen-based conduit had an outer wall to prevent scar tissue infiltration and a porous inner structure to allow axonal growth. Rats that were implanted with the collagen-based conduit to bridge a sciatic nerve defect experienced significantly improved motor and sensory nerve functions and greatly enhanced nerve regeneration compared with rats in the sham control group and the silicone conduit group. Our results suggest that the biodegradable collagen-based nerve conduit is more effective for peripheral nerve regeneration than the silicone conduit. 展开更多
关键词 nerve regeneration BIODEGRADABLE decellularized collagen nerve conduit growth factor peripheral nerve injury REGENERATION silicone conduit rat model
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Sustained release of exosomes loaded into polydopamine-modified chitin conduits promotes peripheral nerve regeneration in rats 被引量:4
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作者 Ci Li Song-Yang Liu +5 位作者 Meng Zhang Wei Pi Bo Wang Qi-Cheng Li Chang-Feng Lu Pei-Xun Zhang 《Neural Regeneration Research》 SCIE CAS CSCD 2022年第9期2050-2057,共8页
Exosomes derived from mesenchymal stem cells are of therapeutic interest because of their important role in intracellular communication and biological regulation.On the basis of previously studied nerve conduits,we de... Exosomes derived from mesenchymal stem cells are of therapeutic interest because of their important role in intracellular communication and biological regulation.On the basis of previously studied nerve conduits,we designed a polydopamine-modified chitin conduit loaded with mesenchymal stem cell-derived exosomes that release the exosomes in a sustained and stable manner.In vitro experiments revealed that rat mesenchymal stem cell-derived exosomes enhanced Schwann cell proliferation and secretion of neurotrophic and growth factors,increased the expression of Jun and Sox2 genes,decreased the expression of Mbp and Krox20 genes in Schwann cells,and reprogrammed Schwann cells to a repair phenotype.Furthermore,mesenchymal stem cell-derived exosomes promoted neurite growth of dorsal root ganglia.The polydopamine-modified chitin conduits loaded with mesenchymal stem cell-derived exosomes were used to bridge 2 mm rat sciatic nerve defects.Sustained release of exosomes greatly accelerated nerve healing and improved nerve function.These findings confirm that sustained release of mesenchymal stem cell-derived exosomes loaded into polydopamine-modified chitin conduits promotes the functional recovery of injured peripheral nerves. 展开更多
关键词 EXOSOME mesenchymal stem cells modification strategy nerve conduits peripheral nerve injury peripheral nerve regeneration POLYDOPAMINE reprogramming state Schwann cells sustained release
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