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González-González MA, Alemansour H, Maroufi M, Coskun MB, Lloyd D, Reza Moheimani SO, Romero-Ortega MI. Biomechanics Characterization of Autonomic and Somatic Nerves by High Dynamic Closed-Loop MEMS force sensing. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.04.13.536752. [PMID: 37090537 PMCID: PMC10120675 DOI: 10.1101/2023.04.13.536752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/25/2023]
Abstract
The biomechanics of peripheral nerves are determined by the blood-nerve barrier (BNB), together with the epineural barrier, extracellular matrix, and axonal composition, which maintain structural and functional stability. These elements are often ignored in the fabrication of penetrating devices, and the implant process is traumatic due to the mechanical distress, compromising the function of neuroprosthesis for sensory-motor restoration in amputees. Miniaturization of penetrating interfaces offers the unique opportunity of decoding individual nerve fibers associated to specific functions, however, a main issue for their implant is the lack of high-precision standardization of insertion forces. Current automatized electromechanical force sensors are available; however, their sensitivity and range amplitude are limited (i.e. mN), and have been tested only in-vitro. We previously developed a high-precision bi-directional micro-electromechanical force sensor, with a closed-loop mechanism (MEMS-CLFS), that while measuring with high-precision (-211.7μN to 211.5μN with a resolution of 4.74nN), can be used in alive animal. Our technology has an on-chip electrothermal displacement sensor with a shuttle beam displacement amplification mechanism, for large range and high-frequency resolution (dynamic range of 92.9 dB), which eliminates the adverse effect of flexural nonlinearity measurements, observed with other systems, and reduces the mechanical impact on delicate biological tissue. In this work, we use the MEMS-CLFS for in-vivo bidirectional measurement of biomechanics in somatic and autonomic nerves. Furthermore we define the mechanical implications of irrigation and collagen VI in the BNB, which is different for both autonomic and somatic nerves (~ 8.5-8.6 fold density of collagen VI and vasculature CD31+ in the VN vs ScN). This study allowed us to create a mathematical approach to predict insertion forces. Our data highlights the necessity of nerve-customization forces to prevent injury when implanting interfaces, and describes a high precision MEMS technology and mathematical model for their measurements.
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Affiliation(s)
| | - Hammed Alemansour
- Erik Jonsson School of Engineering and Computer Science, The University of Texas at Dallas, Richardson, TX. 75080
| | - Mohammad Maroufi
- Erik Jonsson School of Engineering and Computer Science, The University of Texas at Dallas, Richardson, TX. 75080
| | - Mustafa Bulut Coskun
- Erik Jonsson School of Engineering and Computer Science, The University of Texas at Dallas, Richardson, TX. 75080
| | - David Lloyd
- Biomedical Engineering and Biomedical Sciences. University of Houston, Houston TX. 77204-6064
| | - S. O. Reza Moheimani
- Erik Jonsson School of Engineering and Computer Science, The University of Texas at Dallas, Richardson, TX. 75080
| | - Mario I. Romero-Ortega
- Biomedical Engineering and Biomedical Sciences. University of Houston, Houston TX. 77204-6064
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Li X, Zhang X, Hao M, Wang D, Jiang Z, Sun L, Gao Y, Jin Y, Lei P, Zhuo Y. The application of collagen in the repair of peripheral nerve defect. Front Bioeng Biotechnol 2022; 10:973301. [PMID: 36213073 PMCID: PMC9542778 DOI: 10.3389/fbioe.2022.973301] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 08/19/2022] [Indexed: 11/13/2022] Open
Abstract
Collagen is a natural polymer expressed in the extracellular matrix of the peripheral nervous system. It has become increasingly crucial in peripheral nerve reconstruction as it was involved in regulating Schwann cell behaviors, maintaining peripheral nerve functions during peripheral nerve development, and being strongly upregulated after nerve injury to promote peripheral nerve regeneration. Moreover, its biological properties, such as low immunogenicity, excellent biocompatibility, and biodegradability make it a suitable biomaterial for peripheral nerve repair. Collagen provides a suitable microenvironment to support Schwann cells’ growth, proliferation, and migration, thereby improving the regeneration and functional recovery of peripheral nerves. This review aims to summarize the characteristics of collagen as a biomaterial, analyze its role in peripheral nerve regeneration, and provide a detailed overview of the recent advances concerning the optimization of collagen nerve conduits in terms of physical properties and structure, as well as the application of the combination with the bioactive component in peripheral nerve regeneration.
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Affiliation(s)
- Xiaolan Li
- Department of Neurology and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Xiang Zhang
- Department of Neurology and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Ming Hao
- School of Acupuncture-Moxi Bustion and Tuina, Changchun University of Chinese Medicine, Changchun, China
- Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Jilin University, Changchun, China
| | - Dongxu Wang
- Laboratory Animal Center, College of Animal Science, Jilin University, Changchun, China
| | - Ziping Jiang
- Department of Hand and Foot Surgery, The First Hospital of Jilin University, Changchun, China
| | - Liqun Sun
- Department of Pediatrics, First Hospital of Jilin University, Changchun, China
| | - Yongjian Gao
- Department of Gastrointestinal Colorectal and Anal Surgery, China-Japan Union Hospital of Jilin University, Changchun, China
| | - Ye Jin
- Department of Pharmacy, Changchun University of Chinese Medicine, Changchun, China
| | - Peng Lei
- Department of Neurology and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
- *Correspondence: Peng Lei, ; Yue Zhuo,
| | - Yue Zhuo
- School of Acupuncture-Moxi Bustion and Tuina, Changchun University of Chinese Medicine, Changchun, China
- *Correspondence: Peng Lei, ; Yue Zhuo,
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Iwamoto Y, Haraguchi R, Nakao R, Aoki S, Oishi Y, Narita T. One-Pot Preparation of Collagen Tubes Using Diffusing Gelation. ACS OMEGA 2022; 7:22872-22878. [PMID: 35811861 PMCID: PMC9261275 DOI: 10.1021/acsomega.2c02623] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 06/07/2022] [Indexed: 06/15/2023]
Abstract
One-pot gelation in capillary glass tubes with carbonate-based buffer solution allows the formation of hollow collagen gels (collagen tubes) with an outer diameter of 1 mm or less. The preparation conditions of collagen concentration, buffer concentration, and capillary diameter impacted the ratio and size of the hollow gel and allowed for morphological control of the cavity. The morphology of the hollows suggests that their vacancies are the result of macroscopic phase separation and pinning due to gelation. Mechanical strength measurements of the dried collagen gel tubes demonstrated that the collagen concentration determines their Young's modulus and maximum stress and that the material is strong enough for practical use. In vitro seeding studies of vascular endothelial cells demonstrated the possible formation of endothelial cells in layers in the gel lumen.
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Affiliation(s)
- Yui Iwamoto
- Department
of Chemistry and Applied Chemistry, Saga
University, 1 Honjo, Saga 840-8502, Japan
| | - Ryota Haraguchi
- Department
of Chemistry and Applied Chemistry, Saga
University, 1 Honjo, Saga 840-8502, Japan
| | - Ryosuke Nakao
- Department
of Chemistry and Applied Chemistry, Saga
University, 1 Honjo, Saga 840-8502, Japan
| | - Shigehisa Aoki
- Department
of Pathology and Microbiology, Saga University, 5-1-1 Nabeshima, Saga 849-8501, Japan
| | - Yushi Oishi
- Department
of Chemistry and Applied Chemistry, Saga
University, 1 Honjo, Saga 840-8502, Japan
| | - Takayuki Narita
- Department
of Chemistry and Applied Chemistry, Saga
University, 1 Honjo, Saga 840-8502, Japan
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Chan WW, Yeo DCL, Tan V, Singh S, Choudhury D, Naing MW. Additive Biomanufacturing with Collagen Inks. Bioengineering (Basel) 2020; 7:bioengineering7030066. [PMID: 32630194 PMCID: PMC7552643 DOI: 10.3390/bioengineering7030066] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 06/22/2020] [Accepted: 06/25/2020] [Indexed: 12/13/2022] Open
Abstract
Collagen is a natural polymer found abundantly in the extracellular matrix (ECM). It is easily extracted from a variety of sources and exhibits excellent biological properties such as biocompatibility and weak antigenicity. Additionally, different processes allow control of physical and chemical properties such as mechanical stiffness, viscosity and biodegradability. Moreover, various additive biomanufacturing technology has enabled layer-by-layer construction of complex structures to support biological function. Additive biomanufacturing has expanded the use of collagen biomaterial in various regenerative medicine and disease modelling application (e.g., skin, bone and cornea). Currently, regulatory hurdles in translating collagen biomaterials still remain. Additive biomanufacturing may help to overcome such hurdles commercializing collagen biomaterials and fulfill its potential for biomedicine.
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Affiliation(s)
- Weng Wan Chan
- Biomanufacturing Technology, Bioprocessing Technology Institute (BTI), Agency for Science, Technology and Research (A*STAR), Singapore City 138668, Singapore; (W.W.C.); (D.C.L.Y.); (V.T.); (S.S.)
| | - David Chen Loong Yeo
- Biomanufacturing Technology, Bioprocessing Technology Institute (BTI), Agency for Science, Technology and Research (A*STAR), Singapore City 138668, Singapore; (W.W.C.); (D.C.L.Y.); (V.T.); (S.S.)
| | - Vernice Tan
- Biomanufacturing Technology, Bioprocessing Technology Institute (BTI), Agency for Science, Technology and Research (A*STAR), Singapore City 138668, Singapore; (W.W.C.); (D.C.L.Y.); (V.T.); (S.S.)
| | - Satnam Singh
- Biomanufacturing Technology, Bioprocessing Technology Institute (BTI), Agency for Science, Technology and Research (A*STAR), Singapore City 138668, Singapore; (W.W.C.); (D.C.L.Y.); (V.T.); (S.S.)
| | - Deepak Choudhury
- Biomanufacturing Technology, Bioprocessing Technology Institute (BTI), Agency for Science, Technology and Research (A*STAR), Singapore City 138668, Singapore; (W.W.C.); (D.C.L.Y.); (V.T.); (S.S.)
- Correspondence: (D.C.); (M.W.N.)
| | - May Win Naing
- Biomanufacturing Technology, Bioprocessing Technology Institute (BTI), Agency for Science, Technology and Research (A*STAR), Singapore City 138668, Singapore; (W.W.C.); (D.C.L.Y.); (V.T.); (S.S.)
- Singapore Institute of Manufacturing Technology (SIMTech), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-04, Innovis, Singapore City 138634, Singapore
- Correspondence: (D.C.); (M.W.N.)
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Hossain A, Dave D, Shahidi F. Northern Sea Cucumber ( Cucumaria frondosa): A Potential Candidate for Functional Food, Nutraceutical, and Pharmaceutical Sector. Mar Drugs 2020; 18:md18050274. [PMID: 32455954 PMCID: PMC7281287 DOI: 10.3390/md18050274] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 05/18/2020] [Accepted: 05/20/2020] [Indexed: 12/30/2022] Open
Abstract
Sea cucumber (Cucumaria frondosa) is the most abundant and widely distributed species in the cold waters of North Atlantic Ocean. C. frondosa contains a wide range of bioactive compounds, mainly collagen, cerebrosides, glycosaminoglycan, chondroitin sulfate, saponins, phenols, and mucopolysaccharides, which demonstrate unique biological and pharmacological properties. In particular, the body wall of this marine invertebrate is the major edible part and contains most of the active constituents, mainly polysaccharides and collagen, which exhibit numerous biological activities, including anticancer, anti-hypertensive, anti-angiogenic, anti-inflammatory, antidiabetic, anti-coagulation, antimicrobial, antioxidation, and anti- osteoclastogenic properties. In particular, triterpene glycosides (frondoside A and other) are the most researched group of compounds due to their potential anticancer activity. This review summarizes the latest information on C. frondosa, mainly geographical distribution, landings specific to Canadian coastlines, processing, commercial products, trade market, bioactive compounds, and potential health benefits in the context of functional foods and nutraceuticals.
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Affiliation(s)
- Abul Hossain
- Department of Biochemistry, Memorial University of Newfoundland, St. John’s, NL A1B 3X9, Canada;
| | - Deepika Dave
- Department of Biochemistry, Memorial University of Newfoundland, St. John’s, NL A1B 3X9, Canada;
- Marine Bioprocessing Facility, Centre of Aquaculture and Seafood Development, Fisheries and Marine Institute, Memorial University of Newfoundland, St. John’s, NL A1C 5R3, Canada
- Correspondence: (D.D.); (F.S.)
| | - Fereidoon Shahidi
- Department of Biochemistry, Memorial University of Newfoundland, St. John’s, NL A1B 3X9, Canada;
- Correspondence: (D.D.); (F.S.)
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Liu X, Wang Z, Zhang J, Song L, Li D, Wu Z, Zhu B, Nakamura Y, Shahidi F, Yu C, Zhou D. Isolation and identification of zinc-chelating peptides from sea cucumber (Stichopus japonicus) protein hydrolysate. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2019; 99:6400-6407. [PMID: 31283025 DOI: 10.1002/jsfa.9919] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 07/04/2019] [Accepted: 07/05/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND Zinc is known to play an essential role in the biological activities in the human body. In this study, a zinc-chelating peptide (ZCP) produced by Alcalase-assisted hydrolysis of the body wall of sea cucumber was isolated and identified. The ZCP was purified stepwise by ultrafiltration, anion-exchange chromatography, and gel filtration chromatography, in conjunction with ultraviolet-visual (UV-visual) spectrophotometry, which was used to analyze each purified fraction. RESULTS Analysis of the purified ZCP revealed that its zinc-chelating ability was 33.31%. Analysis of isothermal titration calorimetry suggested that the binding of ZCP and zinc (N ≈ 2) was endothermic, with weak binding affinity. Fourier transform infrared spectroscopy spectra (FTIR) indicated that carboxylic and amide groups in ZCP were the primary binding sites of Zn. Sequencing the result by ultra-performance liquid chromatography-quadrupole/time of flight mass spectrometry (UPLC-Q-TOF-MS/MS) showed that a representative ZCP had the sequence WLTPTYPE with a molecular weight of 1005.5 Da. CONCLUSION These results provide a promising foundation for the production of zinc supplements from sea-cucumber-derived ZCPs. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Xiaoyang Liu
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
- National Engineering Research Center of Seafood, Dalian, China
| | - Zixu Wang
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
- National Engineering Research Center of Seafood, Dalian, China
| | - Jing Zhang
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
- National Engineering Research Center of Seafood, Dalian, China
| | - Liang Song
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
- National Engineering Research Center of Seafood, Dalian, China
| | - Deyang Li
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
- National Engineering Research Center of Seafood, Dalian, China
| | - Zixuan Wu
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
- National Engineering Research Center of Seafood, Dalian, China
| | - Beiwei Zhu
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
- National Engineering Research Center of Seafood, Dalian, China
| | - Yoshimasa Nakamura
- Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan
| | - Fereidoon Shahidi
- Department of Biochemistry, Memorial University of Newfoundland, St John's, NL, Canada
| | - Chenxu Yu
- National Engineering Research Center of Seafood, Dalian, China
- Department of Agricultural and Biosystems Engineering, Iowa State University, Iowa, USA
| | - Dayong Zhou
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
- National Engineering Research Center of Seafood, Dalian, China
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Zhang XM, Han LW, Zhang SS, Li XB, He QX, Han J, Wang XM, Liu KC. Targeted discovery and identification of novel nucleoside biomarkers in Apostichopus japonicus viscera using metabonomics. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2018; 38:203-217. [PMID: 30588871 DOI: 10.1080/15257770.2018.1514121] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
In this study, we investigated the metabonomic profiles of Apostichopus japonicus using an LC-MS-based method in conjunction with multivariate data analysis. Based on the PLS-DA model, 85 differential metabolites (VIP value >1.0) were obtained from viscera and body wall samples. The MS/MS and NMR experiments were used for the qualitative identification of the characteristic peaks. Sphingoid-based nucleoside analogues were the main components in Chinese A. japonicus viscera. Our findings demonstrate that A. japonicus viscera contain a large number of compounds that may have applications as nutraceuticals or pharmaceuticals.
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Affiliation(s)
- Xuan-Ming Zhang
- a Key Laboratory for Drug Screening Technology, Biology Institute , Qilu University of Technology (Shandong Academy of Sciences) , Jinan , Shandong , P.R. China
| | - Li-Wen Han
- a Key Laboratory for Drug Screening Technology, Biology Institute , Qilu University of Technology (Shandong Academy of Sciences) , Jinan , Shandong , P.R. China
| | - Shan-Shan Zhang
- a Key Laboratory for Drug Screening Technology, Biology Institute , Qilu University of Technology (Shandong Academy of Sciences) , Jinan , Shandong , P.R. China
| | - Xiao-Bin Li
- a Key Laboratory for Drug Screening Technology, Biology Institute , Qilu University of Technology (Shandong Academy of Sciences) , Jinan , Shandong , P.R. China
| | - Qiu-Xia He
- a Key Laboratory for Drug Screening Technology, Biology Institute , Qilu University of Technology (Shandong Academy of Sciences) , Jinan , Shandong , P.R. China
| | - Jian Han
- a Key Laboratory for Drug Screening Technology, Biology Institute , Qilu University of Technology (Shandong Academy of Sciences) , Jinan , Shandong , P.R. China
| | - Xi-Min Wang
- a Key Laboratory for Drug Screening Technology, Biology Institute , Qilu University of Technology (Shandong Academy of Sciences) , Jinan , Shandong , P.R. China
| | - Ke-Chun Liu
- a Key Laboratory for Drug Screening Technology, Biology Institute , Qilu University of Technology (Shandong Academy of Sciences) , Jinan , Shandong , P.R. China
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Ibrahim N'I, Wong SK, Mohamed IN, Mohamed N, Chin KY, Ima-Nirwana S, Shuid AN. Wound Healing Properties of Selected Natural Products. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2018; 15:ijerph15112360. [PMID: 30366427 PMCID: PMC6266783 DOI: 10.3390/ijerph15112360] [Citation(s) in RCA: 158] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Revised: 10/18/2018] [Accepted: 10/19/2018] [Indexed: 12/12/2022]
Abstract
Wound healing is a complex process of recovering the forms and functions of injured tissues. The process is tightly regulated by multiple growth factors and cytokines released at the wound site. Any alterations that disrupt the healing processes would worsen the tissue damage and prolong repair process. Various conditions may contribute to impaired wound healing, including infections, underlying diseases and medications. Numerous studies on the potential of natural products with anti-inflammatory, antioxidant, antibacterial and pro-collagen synthesis properties as wound healing agents have been performed. Their medicinal properties can be contributed by the content of bioactive phytochemical constituents such as alkaloids, essential oils, flavonoids, tannins, saponins, and phenolic compounds in the natural products. This review highlights the in vitro, in vivo and clinical studies on wound healing promotions by the selected natural products and the mechanisms involved.
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Affiliation(s)
- Nurul 'Izzah Ibrahim
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaacob Latif, Bandar Tun Razak, Cheras, Kuala Lumpur 56000, Malaysia.
| | - Sok Kuan Wong
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaacob Latif, Bandar Tun Razak, Cheras, Kuala Lumpur 56000, Malaysia.
| | - Isa Naina Mohamed
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaacob Latif, Bandar Tun Razak, Cheras, Kuala Lumpur 56000, Malaysia.
| | - Norazlina Mohamed
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaacob Latif, Bandar Tun Razak, Cheras, Kuala Lumpur 56000, Malaysia.
| | - Kok-Yong Chin
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaacob Latif, Bandar Tun Razak, Cheras, Kuala Lumpur 56000, Malaysia.
| | - Soelaiman Ima-Nirwana
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaacob Latif, Bandar Tun Razak, Cheras, Kuala Lumpur 56000, Malaysia.
| | - Ahmad Nazrun Shuid
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaacob Latif, Bandar Tun Razak, Cheras, Kuala Lumpur 56000, Malaysia.
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Nawrotek K, Marqueste T, Modrzejewska Z, Zarzycki R, Rusak A, Decherchi P. Thermogelling chitosan lactate hydrogel improves functional recovery after a C2 spinal cord hemisection in rat. J Biomed Mater Res A 2017; 105:2004-2019. [PMID: 28324618 DOI: 10.1002/jbm.a.36067] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Revised: 01/23/2017] [Accepted: 03/15/2017] [Indexed: 11/06/2022]
Abstract
The present study was designed to provide an appropriate micro-environment for regenerating axotomized neurons and proliferating/migrating cells. Because of its intrinsic permissive properties, biocompatibility and biodegradability, we chose to evaluate the therapeutic effectiveness of a chitosan-based biopolymer. The biomaterial toxicity was measured through in vitro test based on fibroblast cell survival on thermogelling chitosan lactate hydrogel substrate and then polymer was implanted into a C2 hemisection of the rat spinal cord. Animals were randomized into three experimental groups (Control, Lesion and Lesion + Hydrogel) and functional tests (ladder walking and forelimb grip strength tests, respiratory assessment by whole-body plethysmography measurements) were used, once a week during 10 weeks, to evaluate post-traumatic recoveries. Then, electrophysiological examinations (reflexivity of the sub-lesional region, ventilatory adjustments to muscle fatigue known to elicit the muscle metaboreflex and phrenic nerve recordings during normoxia and temporary hypoxia) were performed. In vitro results indicated that the chitosan matrix is a non-toxic biomaterial that allowed fibroblast survival. Furthermore, implanted animals showed improvements of their ladder walking scores from the 4th week post-implantation. Finally, electrophysiological recordings indicated that animals receiving the chitosan matrix exhibited recovery of the H-reflex rate sensitive depression, the ventilatory response to repetitive muscle stimulation and an increase of the phrenic nerve activity to asphyxia compared to lesioned and nonimplanted animals. This study indicates that hydrogel based on chitosan constitute a promising therapeutic approach to repair damaged spinal cord or may be used as an adjuvant with other treatments to enhance functional recovery after a central nervous system damage. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 2004-2019, 2017.
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Affiliation(s)
- Katarzyna Nawrotek
- Faculty of Process and Environmental Engineering, Department of Chemical Engineering, Lodz University of Technology, Wolczanska 175 Street, Lodz, 90-924, Poland
| | - Tanguy Marqueste
- Aix-Marseille Université (AMU) and Centre National de la Recherche Scientifique (CNRS), Institut des Sciences du Mouvement (UMR 7287), Equipe « Plasticité des Systèmes Nerveux et Musculaire », Parc Scientifique et Technologique de Luminy, CC910-163, Avenue de Luminy, F-13288, Marseille Cedex 09, France
| | - Zofia Modrzejewska
- Faculty of Process and Environmental Engineering, Department of Chemical Engineering, Lodz University of Technology, Wolczanska 175 Street, Lodz, 90-924, Poland
| | - Roman Zarzycki
- Faculty of Process and Environmental Engineering, Department of Chemical Engineering, Lodz University of Technology, Wolczanska 175 Street, Lodz, 90-924, Poland
| | - Agnieszka Rusak
- Department of Experimental Surgery and Biomaterials Research, Wroclaw Medical University, Medico-Dental Faculty, Krakowska 26 Street, Wroclaw, Poland, 50-425
| | - Patrick Decherchi
- Aix-Marseille Université (AMU) and Centre National de la Recherche Scientifique (CNRS), Institut des Sciences du Mouvement (UMR 7287), Equipe « Plasticité des Systèmes Nerveux et Musculaire », Parc Scientifique et Technologique de Luminy, CC910-163, Avenue de Luminy, F-13288, Marseille Cedex 09, France
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11
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Sandri M, Filardo G, Kon E, Panseri S, Montesi M, Iafisco M, Savini E, Sprio S, Cunha C, Giavaresi G, Veronesi F, Fini M, Salvatore L, Sannino A, Marcacci M, Tampieri A. Fabrication and Pilot In Vivo Study of a Collagen-BDDGE-Elastin Core-Shell Scaffold for Tendon Regeneration. Front Bioeng Biotechnol 2016; 4:52. [PMID: 27446909 PMCID: PMC4923187 DOI: 10.3389/fbioe.2016.00052] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Accepted: 06/03/2016] [Indexed: 11/13/2022] Open
Abstract
The development of bio-devices for complete regeneration of ligament and tendon tissues is presently one of the biggest challenges in tissue engineering. Such device must simultaneously possess optimal mechanical performance, suitable porous structure, and biocompatible microenvironment. This study proposes a novel collagen-BDDGE-elastin (CBE)-based device for tendon tissue engineering, by the combination of two different modules: (i) a load-bearing, non-porous, “core scaffold” developed by braiding CBE membranes fabricated via an evaporative process and (ii) a hollow, highly porous, “shell scaffold” obtained by uniaxial freezing followed by freeze-drying of CBE suspension, designed to function as a physical guide and reservoir of cells to promote the regenerative process. Both core and shell materials demonstrated good cytocompatibility in vitro, and notably, the porous shell architecture directed cell alignment and population within the sample. Finally, a prototype of the core module was implanted in a rat tendon lesion model, and histological analysis demonstrated its safety, biocompatibility, and ability to induce tendon regeneration. Overall, our results indicate that such device may have the potential to support and induce in situ tendon regeneration.
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Affiliation(s)
- Monica Sandri
- Institute of Science and Technology for Ceramics, National Research Council , Faenza , Italy
| | - Giuseppe Filardo
- Biomechanics and Technology Innovation Laboratory, Rizzoli Orthopaedic Institute, II Orthopaedic and Traumatologic Clinic, Bologna, Italy; Nano-Biotechnology Laboratory, Rizzoli Orthopaedic Institute, II Orthopaedic and Traumatologic Clinic, Bologna, Italy
| | - Elizaveta Kon
- Biomechanics and Technology Innovation Laboratory, Rizzoli Orthopaedic Institute, II Orthopaedic and Traumatologic Clinic, Bologna, Italy; Nano-Biotechnology Laboratory, Rizzoli Orthopaedic Institute, II Orthopaedic and Traumatologic Clinic, Bologna, Italy
| | - Silvia Panseri
- Institute of Science and Technology for Ceramics, National Research Council , Faenza , Italy
| | - Monica Montesi
- Institute of Science and Technology for Ceramics, National Research Council , Faenza , Italy
| | - Michele Iafisco
- Institute of Science and Technology for Ceramics, National Research Council , Faenza , Italy
| | - Elisa Savini
- Institute of Science and Technology for Ceramics, National Research Council , Faenza , Italy
| | - Simone Sprio
- Institute of Science and Technology for Ceramics, National Research Council , Faenza , Italy
| | - Carla Cunha
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto , Porto , Portugal
| | - Gianluca Giavaresi
- Laboratory of Preclinical and Surgical Studies, Rizzoli Orthopaedic Institute, Bologna, Italy; Laboratory of Biocompatibility, Technological Innovations and Advanced Therapies, Department RIT Rizzoli-Rizzoli Orthopaedic Institute, Bologna, Italy
| | - Francesca Veronesi
- Laboratory of Preclinical and Surgical Studies, Rizzoli Orthopaedic Institute , Bologna , Italy
| | - Milena Fini
- Laboratory of Preclinical and Surgical Studies, Rizzoli Orthopaedic Institute, Bologna, Italy; Laboratory of Biocompatibility, Technological Innovations and Advanced Therapies, Department RIT Rizzoli-Rizzoli Orthopaedic Institute, Bologna, Italy
| | - Luca Salvatore
- Department of Engineering for Innovation, University of Salento , Lecce , Italy
| | - Alessandro Sannino
- Department of Engineering for Innovation, University of Salento , Lecce , Italy
| | - Maurilio Marcacci
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto , Porto , Portugal
| | - Anna Tampieri
- Institute of Science and Technology for Ceramics, National Research Council , Faenza , Italy
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12
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Chen SL, Chen ZG, Dai HL, Ding JX, Guo JS, Han N, Jiang BG, # HJ, Li J, Li SP, Li WJ, Liu J, Liu Y, Ma JX, Peng J, Shen YD, Sun GW, Tang PF, Wang GH, Wang XH, Xiang LB, Xie RG, Xu JG, Yu B, Zhang LC, Zhang PX, Zhou SL. Repair, protection and regeneration of peripheral nerve injury. Neural Regen Res 2015; 10:1777-98. [PMID: 26807113 PMCID: PMC4705790 DOI: 10.4103/1673-5374.170301] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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Janakiram NB, Mohammed A, Rao CV. Sea Cucumbers Metabolites as Potent Anti-Cancer Agents. Mar Drugs 2015; 13:2909-23. [PMID: 25984989 PMCID: PMC4446612 DOI: 10.3390/md13052909] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Revised: 04/16/2015] [Accepted: 04/28/2015] [Indexed: 12/20/2022] Open
Abstract
Sea cucumbers and their extracts have gained immense popularity and interest among researchers and nutritionists due to their nutritive value, potential health benefits, and use in the treatment of chronic inflammatory diseases. Many areas of the world use sea cucumbers in traditional foods and folk medicine. Though the actual components and their specific functions still remain to be investigated, most sea cucumber extracts are being studied for their anti-inflammatory functions, immunostimulatory properties, and for cancer prevention and treatment. There is large scope for the discovery of additional bioactive, valuable compounds from this natural source. Sea cucumber extracts contain unique components, such as modified triterpene glycosides, sulfated polysaccharides, glycosphingolipids, and esterified phospholipids. Frondanol A5, an isopropyl alcohol/water extract of the enzymatically hydrolyzed epithelia of the edible North Atlantic sea cucumber, Cucumaria frondosa, contains monosulfated triterpenoid glycoside Frondoside A, the disulfated glycoside Frondoside B, the trisulfated glycoside Frondoside C, 12-methyltetradecanoic acid, eicosapentaenoic acid, and fucosylated chondroitin sulfate. We have extensively studied the efficacy of this extract in preventing colon cancer in rodent models. In this review, we discuss the anti-inflammatory, immunostimulatory, and anti-tumor properties of sea cucumber extracts.
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Affiliation(s)
- Naveena B Janakiram
- Center for Cancer Prevention and Drug Development, Department of Medicine, Hem-Onc Section, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA.
| | - Altaf Mohammed
- Center for Cancer Prevention and Drug Development, Department of Medicine, Hem-Onc Section, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA.
| | - Chinthalapally V Rao
- Center for Cancer Prevention and Drug Development, Department of Medicine, Hem-Onc Section, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA.
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14
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Zhu B, Li W, Lewis RV, Segre CU, Wang R. E-spun composite fibers of collagen and dragline silk protein: fiber mechanics, biocompatibility, and application in stem cell differentiation. Biomacromolecules 2014; 16:202-13. [PMID: 25405355 PMCID: PMC4294589 DOI: 10.1021/bm501403f] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
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Biocomposite
matrices with high mechanical strength, high stability,
and the ability to direct matrix-specific stem cell differentiation
are essential for the reconstruction of lesioned tissues in tissue
engineering and cell therapeutics. Toward this end, we used the electrospinning
technique to fabricate well-aligned composite fibers from collagen
and spider dragline silk protein, obtained from the milk of transgenic
goats, mimicking the native extracellular matrix (ECM) on a similar
scale. Collagen and the dragline silk proteins were found to mix homogeneously
at all ratios in the electrospun (E-spun) fibers. As a result, the
ultimate tensile strength and elasticity of the fibers increased monotonically
with silk percentage, whereas the stretchability was slightly reduced.
Strikingly, we found that the incorporation of silk proteins to collagen
dramatically increased the matrix stability against excessive fiber
swelling and shape deformation in cell culture medium. When human
decidua parietalis placental stem cells (hdpPSCs) were seeded on the
collagen–silk matrices, the matrices were found to support
cell proliferation at a similar rate as that of the pure collagen
matrix, but they provided cell adhesion with reduced strengths and
induced cell polarization at varied levels. Matrices containing 15
and 30 wt % silk in collagen (CS15, CS30) were found to induce a level
of neural differentiation comparable to that of pure collagen. In
particular, CS15 matrix induced the highest extent of cell polarization
and promoted the development of extended 1D neural filaments strictly
in-line with the aligned fibers. Taking the increased mechanical strength
and fiber stability into consideration, CS15 and CS30 E-spun fibers
offer better alternatives to pure collagen fibers as scaffolds that
can be potentially utilized in neural tissue repair and the development
of future nanobiodevices.
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Affiliation(s)
- Bofan Zhu
- Department of Biological and Chemical Sciences, ‡Department of Physics, Illinois Institute of Technology , Chicago, Illinois 60616, United States
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15
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The use of poly(N-[2-hydroxypropyl]-methacrylamide) hydrogel to repair a T10 spinal cord hemisection in rat: a behavioural, electrophysiological and anatomical examination. ASN Neuro 2013; 5:149-66. [PMID: 23614684 PMCID: PMC3667642 DOI: 10.1042/an20120082] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
There have been considerable interests in attempting to reverse the deficit because of an SCI (spinal cord injury) by restoring neural pathways through the lesion and by rebuilding the tissue network. In order to provide an appropriate micro-environment for regrowing axotomized neurons and proliferating and migrating cells, we have implanted a small block of pHPMA [poly N-(2-hydroxypropyl)-methacrylamide] hydrogel into the hemisected T10 rat spinal cord. Locomotor activity was evaluated once a week during 14 weeks with the BBB rating scale in an open field. At the 14th week after SCI, the reflexivity of the sub-lesional region was measured. We also monitored the ventilatory frequency during an electrically induced muscle fatigue known to elicit the muscle metaboreflex and increase the respiratory rate. Spinal cords were then collected, fixed and stained with anti-ED-1 and anti-NF-H antibodies and FluoroMyelin. We show in this study that hydrogel-implanted animals exhibit: (i) an improved locomotor BBB score, (ii) an improved breathing adjustment to electrically evoked isometric contractions and (iii) an H-reflex recovery close to control animals. Qualitative histological results put in evidence higher accumulation of ED-1 positive cells (macrophages/monocytes) at the lesion border, a large number of NF-H positive axons penetrating the applied matrix, and myelin preservation both rostrally and caudally to the lesion. Our data confirm that pHPMA hydrogel is a potent biomaterial that can be used for improving neuromuscular adaptive mechanisms and H-reflex responses after SCI.
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Lin HY, Kuo YJ, Chang SH, Ni TS. Characterization of electrospun nanofiber matrices made of collagen blends as potential skin substitutes. Biomed Mater 2013; 8:025009. [DOI: 10.1088/1748-6041/8/2/025009] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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17
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Actinopyga lecanora hydrolysates as natural antibacterial agents. Int J Mol Sci 2012; 13:16796-811. [PMID: 23222684 PMCID: PMC3546722 DOI: 10.3390/ijms131216796] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Accepted: 12/01/2012] [Indexed: 11/17/2022] Open
Abstract
Actinopyga lecanora, a type of sea cucumber commonly known as stone fish with relatively high protein content, was explored as raw material for bioactive peptides production. Six proteolytic enzymes, namely alcalase, papain, pepsin, trypsin, bromelain and flavourzyme were used to hydrolyze A. lecanora at different times and their respective degrees of hydrolysis (DH) were calculated. Subsequently, antibacterial activity of the A. lecanora hydrolysates, against some common pathogenic Gram positive bacteria (Bacillus subtilis and Staphylococcus aureus) and Gram negative bacteria (Escherichia coli, Pseudomonas aeruginosa, and Pseudomonas sp.) were evaluated. Papain hydrolysis showed the highest DH value (89.44%), followed by alcalase hydrolysis (83.35%). Bromelain hydrolysate after one and seven hours of hydrolysis exhibited the highest antibacterial activities against Pseudomonas sp., P. aeruginosa and E. coli at 51.85%, 30.07% and 30.45%, respectively compared to the other hydrolysates. Protein hydrolysate generated by papain after 8 h hydrolysis showed maximum antibacterial activity against S. aureus at 20.19%. The potent hydrolysates were further fractionated using RP-HPLC and antibacterial activity of the collected fractions from each hydrolysate were evaluated, wherein among them only three fractions from the bromelain hydrolysates exhibited inhibitory activities against Pseudomonas sp., P. aeruginosa and E. coli at 24%, 25.5% and 27.1%, respectively and one fraction of papain hydrolysate showed antibacterial activity of 33.1% against S. aureus. The evaluation of the relationship between DH and antibacterial activities of papain and bromelain hydrolysates revealed a meaningful correlation of four and six order functions.
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18
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Zhou X, Wang C, Jiang A. Antioxidant peptides isolated from sea cucumber Stichopus Japonicus. Eur Food Res Technol 2011. [DOI: 10.1007/s00217-011-1610-x] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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In Vitro Antitumor Activities of Low Molecular Sea Cucumber Stichopus japonicus Peptides Sequentially Hydrolyzed by Proteases. ACTA ACUST UNITED AC 2011. [DOI: 10.4028/www.scientific.net/amr.393-395.1259] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The sea cucumber (Stichopus japonicus) was continuously hydrolyzed by pepsin, trypsin to get sea cucumber peptides (SCP), and low molecular peptides (LSCP), MW < 3000 Da, were collected through an ultrafiltration membrane with a molecular weight cut-off of 3000 Da Two main fractions, LSCP-1 and LSCP-2 were obtained by one step gel filtration column chromatography. Furthermore, the antitumor activities, in vitro, of LSCP-1 and LSCP-2 fractions were evaluated by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) assay. LSCP-2 showed significantly antitumor activity against the SGC-7901 and MCF-7 cell lines, LSCP-1 showed significantly antitumor activity only against SGC-7901 cell line, and two fractions did not show activity against A549 cell line. Overall, this study indicated that LSCP posseses potential to treat gastric cancer and breast cancer.
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Bordbar S, Anwar F, Saari N. High-value components and bioactives from sea cucumbers for functional foods--a review. Mar Drugs 2011; 9:1761-1805. [PMID: 22072996 PMCID: PMC3210605 DOI: 10.3390/md9101761] [Citation(s) in RCA: 333] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Revised: 08/30/2011] [Accepted: 09/08/2011] [Indexed: 12/01/2022] Open
Abstract
Sea cucumbers, belonging to the class Holothuroidea, are marine invertebrates, habitually found in the benthic areas and deep seas across the world. They have high commercial value coupled with increasing global production and trade. Sea cucumbers, informally named as bêche-de-mer, or gamat, have long been used for food and folk medicine in the communities of Asia and Middle East. Nutritionally, sea cucumbers have an impressive profile of valuable nutrients such as Vitamin A, Vitamin B1 (thiamine), Vitamin B2 (riboflavin), Vitamin B3 (niacin), and minerals, especially calcium, magnesium, iron and zinc. A number of unique biological and pharmacological activities including anti-angiogenic, anticancer, anticoagulant, anti-hypertension, anti-inflammatory, antimicrobial, antioxidant, antithrombotic, antitumor and wound healing have been ascribed to various species of sea cucumbers. Therapeutic properties and medicinal benefits of sea cucumbers can be linked to the presence of a wide array of bioactives especially triterpene glycosides (saponins), chondroitin sulfates, glycosaminoglycan (GAGs), sulfated polysaccharides, sterols (glycosides and sulfates), phenolics, cerberosides, lectins, peptides, glycoprotein, glycosphingolipids and essential fatty acids. This review is mainly designed to cover the high-value components and bioactives as well as the multiple biological and therapeutic properties of sea cucumbers with regard to exploring their potential uses for functional foods and nutraceuticals.
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Affiliation(s)
- Sara Bordbar
- Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia; E-Mails: (S.B.); (F.A.)
| | - Farooq Anwar
- Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia; E-Mails: (S.B.); (F.A.)
- Department of Chemistry and Biochemistry, University of Agriculture, Faisalabad 38040, Pakistan
| | - Nazamid Saari
- Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia; E-Mails: (S.B.); (F.A.)
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Yao L, Billiar KL, Windebank AJ, Pandit A. Multichanneled Collagen Conduits for Peripheral Nerve Regeneration: Design, Fabrication, and Characterization. Tissue Eng Part C Methods 2010; 16:1585-96. [DOI: 10.1089/ten.tec.2010.0152] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Affiliation(s)
- Li Yao
- Network of Excellence for Functional Biomaterials (NFB), National University of Ireland, Galway, Ireland
- Department of Neurology, Mayo Clinic College of Medicine, Rochester, Minnesota
| | - Kristen L. Billiar
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts
| | | | - Abhay Pandit
- Network of Excellence for Functional Biomaterials (NFB), National University of Ireland, Galway, Ireland
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23
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Ni HC, Lin ZY, Hsu SH, Chiu IM. The use of air plasma in surface modification of peripheral nerve conduits. Acta Biomater 2010; 6:2066-76. [PMID: 20040388 DOI: 10.1016/j.actbio.2009.12.038] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2009] [Revised: 12/16/2009] [Accepted: 12/21/2009] [Indexed: 12/27/2022]
Abstract
Surface modification is a conventional approach in biomaterials development, but most of the modification processes are intricate and time inefficient. In this study, a convenient open air plasma treatment was employed to modify the surface of poly(d,l-lactide) (PLA). Chitosan and fibroblast growth factor 1 (FGF1) were sequentially grafted with the assistance of open air plasma treatment onto the PLA nerve conduits with designed micropores and surface microgrooves. Grafting of these components was verified by electron spectroscopy for chemical analysis. The modified nerve conduits showed enhanced ability in the repair of 10-mm sciatic nerve transection defects in rats. The sequential air plasma treatment can be a convenient way to introduce biocompatible (e.g., chitosan) and bioactive components (e.g., growth factors) onto the surface of biomaterials.
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Abstract
Peripheral nerve regeneration is a complicated and long-term medical challenge that requires suitable guides for bridging nerve injury gaps and restoring nerve functions. Many natural and synthetic polymers have been used to fabricate nerve conduits as well as luminal fillers for achieving desired nerve regenerative functions. It is important to understand the intrinsic properties of these polymers and techniques that have been used for fabricating nerve conduits. Previously extensive reviews have been focused on the biological functions and in vivo performance of polymeric nerve conduits. In this paper, we emphasize on the structures, thermal and mechanical properties of these naturally derived synthetic polymers, and their fabrication methods. These aspects are critical for the performance of fabricated nerve conduits. By learning from the existing candidates, we can advance the strategies for designing novel polymeric systems with better properties for nerve regeneration.
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Xiangmei W, Jing Z, Hao C, Qingrui W. Preparation and characterization of collagen-based composite conduit for peripheral nerve regeneration. J Appl Polym Sci 2009. [DOI: 10.1002/app.29811] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Comparison of collagen biomatrix and omentum effectiveness on peripheral nerve regeneration. Neurosurg Rev 2009; 32:355-62; discussion 362. [DOI: 10.1007/s10143-009-0193-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2008] [Revised: 12/09/2008] [Accepted: 01/18/2009] [Indexed: 11/25/2022]
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Chaudhry B, Ashton H, Muhamed A, Yost M, Bull S, Frankel D. Nanoscale viscoelastic properties of an aligned collagen scaffold. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2009; 20:257-263. [PMID: 18763020 DOI: 10.1007/s10856-008-3574-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2008] [Accepted: 08/18/2008] [Indexed: 05/26/2023]
Abstract
Localised mechanical properties for aligned collagen scaffolds derived from Type 1 collagen were determined by application of nanoindentation based techniques. It was possible to measure the modulus and hardness with nanometre control over the depth of penetration and quasi-static testing under displacement control yielded average modulus values ranging from 1.71 GPa to 3.31 GPa; a narrower range of values than obtained by other methods. Hardness values of 222 MPa to 256 MPa were recorded and showed little scatter, highlighting the potential of nanoindentation hardness values as a reproducible and accurate measure of soft material properties. Open loop Load-displacement curves for the collagen exhibited the expected shapes for a viscoelastic material and it was thus possible to apply dynamic stiffness measurement at the nano scale. As well as determining the storage modulus (0.71 GPa) and the loss modulus (0.40 GPa) at the sub-micron length and nano depth resolution it was also possible to discriminate between surface and bulk readings allowing surface effects to be discarded if necessary. In addition to being a more accurate indentation method than atomic force microscopy, the localised dynamic mechanical properties of collagen were measured for the first time. These results demonstrate that this nanoindentation technique can serve as a powerful tool for the characterisation of collagen based biomaterials that are used as scaffolds for a variety of engineered tissues, such as artificial skin, skeletal muscle, heart valves and neuroregeneration guides.
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Affiliation(s)
- Bill Chaudhry
- Institute of Human Genetics, Newcastle University, Newcastle upon Tyne, NE1 3BZ, UK
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Hsu SH, Su CH, Chiu IM. A Novel Approach to Align Adult Neural Stem Cells on Micropatterned Conduits for Peripheral Nerve Regeneration: A Feasibility Study. Artif Organs 2009; 33:26-35. [DOI: 10.1111/j.1525-1594.2008.00671.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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30
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Bozkurt A, Deumens R, Beckmann C, Olde Damink L, Schügner F, Heschel I, Sellhaus B, Weis J, Jahnen-Dechent W, Brook GA, Pallua N. In vitro cell alignment obtained with a Schwann cell enriched microstructured nerve guide with longitudinal guidance channels. Biomaterials 2008; 30:169-79. [PMID: 18922575 DOI: 10.1016/j.biomaterials.2008.09.017] [Citation(s) in RCA: 120] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2008] [Accepted: 09/02/2008] [Indexed: 11/19/2022]
Abstract
Therapeutic benefits of autologous nerve grafting in repair of peripheral nerve lesions have not been reached using any alternative nerve guide. Nevertheless, issues of co-morbidity and limited availability of donor nerves urgently ask for a need of bioartificial nerve guides which could either replace or complement autologous nerve grafts. It is increasingly appreciated that optimal nerve guides comprise both physical and molecular cues in support of peripheral axon regeneration. Now, we present a collagen-based microstructured 3D nerve guide containing numerous longitudinal guidance channels with dimensions resembling natural endoneurial tubes. Moreover, these nerve guides could be functionalized by Schwann cell (SC) seeding. Viable SCs did not only adhere to the nerve guide, but also migrated throughout the guidance channels. Of particular importance was the observation that SCs within the guidance channels formed cellular columns reminiscent of "Bands of Büngner", which are crucial structures in the natural process of peripheral nerve regeneration during the Wallerian degeneration. We, therefore, conclude that our orientated 3D nerve guides (decorated with SCs) with their physical and molecular properties may hold great promise in the repair of peripheral nerve lesion and serve as a basis for future experimental regeneration studies.
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Affiliation(s)
- Ahmet Bozkurt
- Department of Plastic Surgery, Hand and Burn Surgery, RWTH Aachen University Hospital, Aachen, Germany.
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Touny AH, Laurencin C, Nair L, Allcock H, Brown PW. Formation of composites comprised of calcium deficient HAp and cross-linked gelatin. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2008; 19:3193-3201. [PMID: 18452028 DOI: 10.1007/s10856-008-3459-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2007] [Accepted: 04/16/2008] [Indexed: 05/26/2023]
Abstract
Cross-linked gelatin/calcium deficient hydroxyapatite (CDHAp) composites were prepared at or near physiologic temperature. alpha-tricalcium phosphate (alpha-TCP) or a mixture of tetracalcium phosphate and dicalcium phosphate were used as CDHAp precursors. Glutaraldehyde was used to cross-link the gelatin fibers. CDHAp formation reached completion in the presence of cross-linked gelatin fibers. Effects of cross-linking concentrations, proportions of gelatin fiber, molecular weight of gelatin and the temperature of the hydration reaction on the formation of CDHAp were studied. Cross-linked gelatin acts as a nucleating agent for CDHAp formation. The pH variations during CDHAp formation are lower at the onset of the reactions in the presence of cross-linked gelatin fibers. Although cross-linked gelatin fibers enhance CDHAp formation their composites have low mechanical strengths. Swelling of gelatin appears to be a major factor that limits the strengths of the CDHAp/cross-linked gelatin composites.
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Affiliation(s)
- Ahmed H Touny
- Department of Materials Science and Engineering, Penn State University, Room 136 Materials Research Laboratory, University Park, PA 16802, USA
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Wang X, Zhang J, Wang Q. Surface Modification of GTA Crosslinked Collagen‐based Composite Scaffolds with Low Temperature Plasma Technology. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2008. [DOI: 10.1080/10601320802108187] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Zhao Y, Li B, Liu Z, Dong S, Zhao X, Zeng M. Antihypertensive effect and purification of an ACE inhibitory peptide from sea cucumber gelatin hydrolysate. Process Biochem 2007. [DOI: 10.1016/j.procbio.2007.08.011] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Bozkurt A, Brook GA, Moellers S, Lassner F, Sellhaus B, Weis J, Woeltje M, Tank J, Beckmann C, Fuchs P, Damink LO, Schügner F, Heschel I, Pallua N. In Vitro Assessment of Axonal Growth Using Dorsal Root Ganglia Explants in a Novel Three-Dimensional Collagen Matrix. ACTA ACUST UNITED AC 2007; 13:2971-9. [DOI: 10.1089/ten.2007.0116] [Citation(s) in RCA: 137] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ahmet Bozkurt
- Department of Plastic and Hand Surgery, Burn Center, University Hospital, RWTH Aachen University, Aachen, Germany
| | - Gary A. Brook
- Department of Neurology, University Hospital, RWTH Aachen University, Aachen, Germany
- Institute of Neuropathology, RWTH Aachen University, Aachen, Germany
| | - Sven Moellers
- Department of Neurology, University Hospital, RWTH Aachen University, Aachen, Germany
| | | | - Bernd Sellhaus
- Institute of Neuropathology, RWTH Aachen University, Aachen, Germany
| | - Joachim Weis
- Institute of Neuropathology, RWTH Aachen University, Aachen, Germany
| | | | - Julian Tank
- Department of Plastic and Hand Surgery, Burn Center, University Hospital, RWTH Aachen University, Aachen, Germany
| | - Christina Beckmann
- Department of Plastic and Hand Surgery, Burn Center, University Hospital, RWTH Aachen University, Aachen, Germany
| | - Paul Fuchs
- Department of Plastic and Hand Surgery, Burn Center, University Hospital, RWTH Aachen University, Aachen, Germany
| | | | | | | | - Norbert Pallua
- Department of Plastic and Hand Surgery, Burn Center, University Hospital, RWTH Aachen University, Aachen, Germany
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Ruozi B, Tosi G, Leo E, Parma B, Vismara S, Forni F, Vandelli MA. Intact collagen and atelocollagen sponges: Characterization and ESEM observation. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2007. [DOI: 10.1016/j.msec.2006.08.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Chang CJ, Hsu SH, Yen HJ, Chang H, Hsu SK. Effects of unidirectional permeability in asymmetric poly(DL-lactic acid-co-glycolic acid) conduits on peripheral nerve regeneration: Anin vitro andin vivo study. J Biomed Mater Res B Appl Biomater 2007; 83:206-15. [PMID: 17405166 DOI: 10.1002/jbm.b.30785] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The high outflow permeability of the nerve conduit used to emit the drained waste generated from the traumatized host nerve stump is critical in peripheral nerve regeneration. Our earlier studies have established that asymmetric conduits fulfill the basic requirements for use as nerve guide conduits. In this study, the inflow characteristics of optimal nerve conduits were further examined using in vivo and in vitro trials. Various asymmetric poly(DL-lactic acid-co-glycolic acid) (PLGA) conduits were controlled by modifying precipitation baths using 0, 20, and 95% isopropyl alcohol, with high-porosity (permeability), medium-porosity (high outflow and low inflow), and low-porosity (permeability), respectively. In the in vitro trial, the Schwann cells and fibroblasts were seeded on either side of the asymmetric PLGA films in a newly designed coculture system that simulated the repaired nerve conduit environment. The results of the directional permeable films indicated the statistically significant proliferation of Schwann cells and the inhibition of the division of fibroblasts in lactate dehydrogenase release and inhibition of 3-(4,5-dimethylthiazol-2-yl)2,5-diphenyl-tetrazolium bromide (MTT) reduction, compared with the other films. In the in vivo trial, the PLGA conduits seeded with Schwann cells were implanted into 10 mm right sciatic nerve defects in rats. After 6 weeks, implanted conduits were harvested. Histological examination verified that directional permeable conduits had markedly more A-type and B-type myelin fibers in the midconduit and distal nerve. In this work, the directional transport characteristics were established as an extremely important factor to the design and development of optimal nerve guide conduits in peripheral nerve regeneration.
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Affiliation(s)
- Chen-Jung Chang
- Department of Radiological Technology, Central Taiwan University of Science and Technology, Taichung, Taiwan
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Hadassah J, Sehgal PK. A novel method to measure oxygen permeability and transmissibility of contact lenses. Clin Exp Optom 2006; 89:374-80. [PMID: 17026605 DOI: 10.1111/j.1444-0938.2006.00080.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
PURPOSE The present paper describes an accurate and cost-effective method requiring simple equipment to measure the oxygen permeability and transmissibility of contact lenses. METHOD The method involves accurate measurement of oxygen across the material by allowing the gas (oxygen) to pass through the lens material in a specially fabricated lens mould. The expelled gas is collected by dissolution in ethanol and the oxygen is measured by titration of the solvent. RESULT This method is suitable for the measurement of oxygen permeability and transmissibility of contact lenses of varying thickness and different radii of curvature. It can measure Dk and Dk/t of collagen bandage lenses in both wet and dry conditions. CONCLUSION The oxygen permeability and transmissibility values obtained by this method were compared with the oxygen permeability standard values of commercially available contact lenses and the results are summarised.
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Affiliation(s)
- J Hadassah
- Bioproducts Laboratory, Central Leather Research Institute, Adyar, Chennai, India
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Vleggeert-Lankamp CLAM, de Ruiter GCW, Wolfs JFC, Pêgo AP, van den Berg RJ, Feirabend HKP, Malessy MJA, Lakke EAJF. Pores in synthetic nerve conduits are beneficial to regeneration. J Biomed Mater Res A 2006; 80:965-82. [PMID: 17106899 DOI: 10.1002/jbm.a.30941] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Current opinion holds that pores in synthetic nerve guides facilitate nerve regeneration. Solid factual support for this opinion, however, is absent; most of the relevant studies assessed only morphological parameters and results have been contradictory. To evaluate the effect of pores, the rat sciatic nerve was either autografted or grafted with nonporous, macroporous (10-230 mum), and microporous (1-10 microm) biodegradable epsilon-caprolactone grafts. Twelve weeks later, the grafted nerves were resected, and the electrophysiological properties were determined in vitro. Subsequently midgraft-level sections were inspected, and peroneal nerve sections were evaluated morphometrically. Finally, the gastrocnemic and tibial muscle morphometrical properties were quantified. The microporous nerve graft performed much better than the nonporous and macroporous grafts with respect to most parameters: it was bridged by a free floating bundle that contained myelinated nerve fibers, there were more nerve fibers present distal to the graft, the electrophysiological response rate was higher, and the decrease in muscle cross-sectional area was markedly smaller. Hence, the present study demonstrates the beneficial effect of synthetic nerve guide pores on nerve regeneration, although with the caveat that not pores per se, but only small (1-10 microm) pores were effective.
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Affiliation(s)
- C L A M Vleggeert-Lankamp
- Neuroregulation Group, Department of Neurosurgery, Leiden University Medical Centre (LUMC), P.O. Box 9600, NL-2300 RC Leiden, the Netherlands.
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Carone TW, Hasenwinkel JM. Mechanical and morphological characterization of homogeneous and bilayered poly(2-hydroxyethyl methacrylate) scaffolds for use in CNS nerve regeneration. J Biomed Mater Res B Appl Biomater 2006; 78:274-82. [PMID: 16447165 DOI: 10.1002/jbm.b.30483] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Homogeneous and bilayered macroporous poly(2-hydroxyethyl methacrylate), p(HEMA), hydrogel scaffolds were examined as possible matrices for nerve regeneration in the CNS. An important issue to consider for a CNS scaffold is that it must be able to closely mimic the natural tissue it is replacing, while remaining intact, and mechanically stable enough to allow for regenerating axons to elongate through it. Phase-separated homogeneous and bilayered p(HEMA) scaffolds were fabricated, by varying water, crosslinking, and initiating agents; all of which directly affected the mechanical properties of the polymer. An increase in water concentration resulted in a decrease in the modulus for a given crosslinking and initiating concentration for all homogenous scaffolds, but the same result was not evident in the bilayered scaffolds. The distinct regions within the bilayered scaffolds generate a matrix, containing both a highly porous region with modulus values representative of spinal cord tissue, as well as a nonporous region that provides overall mechanical stability to the entire implant. The overall result is a composite matrix for possible use in CNS nerve regeneration, which mimics the mechanical properties of spinal tissue, but can withstand the forces that it will be subjected to in the injury site.
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Affiliation(s)
- Terrance W Carone
- Department of Biomedical and Chemical Engineering, Syracuse University, 121 Link Hall, New York 13244, USA.
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Abstract
Nerve regeneration is a complex biological phenomenon. Once the nervous system is impaired, its recovery is difficult and malfunctions in other parts of the body may occur because mature neurons do not undergo cell division. To increase the prospects of axonal regeneration and functional recovery, researches have focused on designing "nerve guidance channels" or "nerve conduits." When developing ideal tissue-engineered nerve conduits, several components come to mind. They include a biodegradable and porous channel wall, the ability to deliver bioactive growth factors, incorporation of support cells, an internal oriented matrix to support cell migration, intraluminal channels to mimic the structure of nerve fascicles, and electrical activities. This article reviews the factors that are critical for nerve repair, and the advanced technologies that are explored to fabricate nerve conduits. To more accurately mimic natural repair in the body, recent studies have focused on the use of various advanced approaches to create ideal nerve conduits that combine multiple stimuli in an effort to better mimic the complex signals normally found in the body.
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Affiliation(s)
- Yi-Cheng Huang
- Institute of Biomedical Engineering, College of Engineering, College of Medicine, National Taiwan University, Taipei, Taiwan.
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Ahmed MR, Vairamuthu S, Shafiuzama M, Basha SH, Jayakumar R. Microwave irradiated collagen tubes as a better matrix for peripheral nerve regeneration. Brain Res 2005; 1046:55-67. [PMID: 15927550 DOI: 10.1016/j.brainres.2005.03.022] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2004] [Revised: 03/02/2005] [Accepted: 03/15/2005] [Indexed: 01/02/2023]
Abstract
Collagen is one of the best materials used for nerve guide preparation due to its biocompatibility and desirable tensile strength. In this work, we have compared regeneration and functional reinnervation after sciatic nerve resection with bioresorbable crosslinked collagen guides in 10 mm gap. The crosslinking was carried out either with glutaraldehyde (GTA) or microwave irradiation (MWI). The multilayered collagen membrane used for nerve guides are prepared by lamellar evaporation technique. Functional evaluations of the regenerated nerves were performed by measuring the sciatic functional index (SFI), nerve conduction velocity (NCV), and electromyography (EMG). Transmission electron microscopic studies showed growth of axonal cable with fewer myelinated axons, Schwann cells and more unmyelinated axons present in the case of group treated with uncrosslinked collagen tubes after 1 month of implantation. However, we have observed more myelinated axons in the case of autograft, GTA, and MWI crosslinked collagen tube implants across the gap of 1 cm after the same period of implantation. Smaller myelinated fiber diameter was observed in the case of GTA crosslinked collagen tube group when compared with the autograft and MWI collagen tube groups. There were more myelinated axons during the 3rd and 6th months postoperatively using these conduits as substantiated by light microscopic studies of the regenerated nerve. The conduction velocity and recovery index improved significantly after 5 months reaching the normal values in the autograft and MWI crosslinked collagen groups compared to GTA and uncrosslinked collagen tubes.
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Affiliation(s)
- Mohamed Rafiuddin Ahmed
- Bio-Organic and Neurochemistry Laboratory, Central Leather Research Institute, Adyar, Chennai, India
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Ahmed MR, Basha SH, Gopinath D, Muthusamy R, Jayakumar R. Initial upregulation of growth factors and inflammatory mediators during nerve regeneration in the presence of cell adhesive peptide-incorporated collagen tubes. J Peripher Nerv Syst 2005; 10:17-30. [PMID: 15703015 DOI: 10.1111/j.1085-9489.2005.10105.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Neurotrophic factors play an important modulatory role in axonal sprouting during nerve regeneration involving the proliferation of hematogenous and Schwann cells in damaged tissue. We have exposed lesioned sciatic nerves to a collagen prosthesis with covalently bonded small cell adhesive peptides Arg-Gly-Asp-Ser (RGDS), Lys-Arg-Asp-Ser (KRDS), and Gly-His-Lys (GHK) to study local production of growth factors and cytokines in the regenerating tissues. Western/enzyme-linked immunosorbent assay (ELISA) studies were performed after 10 days of regeneration, when the tubular prosthesis is filled with fibrous matrix infiltrated by hematogenous cells and proliferating Schwann cells with growth factors produced locally. Regeneration was also analyzed by morphometrical methods after 30 days. The quantification of growth factors and proteins by ELISA revealed that there was an enhanced expression of the neurotrophic factors nerve growth factor (NGF) and neurotrophins (NT-3 and NT-4) in the regenerating tissues. This was further established by Western blot to qualitatively analyze the presence of the antigens in the regenerating tissues. Schwann cells were localized in the regenerating tissues using antibodies against S-100 protein. Other growth factors including growth-associated protein 43 (GAP-43), apolipoprotein E (Apo E), and pro-inflammatory cytokine like interleukin-1alpha (IL-1alpha) expression in the peptide groups were evaluated by ELISA and confirmed by Western blotting. Cell adhesive integrins in the proliferating cells were localized using integrin-alpha V. The combined results suggest that the early phase of regeneration of peripheral nerves in the presence of peptide-incorporated collagen tubes results in the enhanced production of trophic factors by the recruited hematogenous cells and Schwann cells, which in turn help in the secretion of certain vital trophic and tropic factors essential for early regeneration. Furthermore, hematogenous cells recruited within the first 10 days of regeneration help in the production of inflammatory mediators like interleukins that in turn stimulate Schwann cells to produce NGF for axonal growth.
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Affiliation(s)
- Mohamed Rafiuddin Ahmed
- Bio-organic and Neurochemistry Laboratory, Central Leather Research Institute, Adyar, Chennai, India
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Roitberg B. Research news and notes. SURGICAL NEUROLOGY 2004; 61:414-5. [PMID: 15120206 DOI: 10.1016/j.surneu.2004.02.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
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