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Farzan A, Borandeh S, Seppälä J. Conductive polyurethane/PEGylated graphene oxide composite for 3D-printed nerve guidance conduits. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111068] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Sorkin JA, Rechany Z, Almog M, Dietzmeyer N, Shapira Y, Haastert-Talini K, Rochkind S. A Rabbit Model for Peripheral Nerve Reconstruction Studies Avoiding Automutilation Behavior. J Brachial Plex Peripher Nerve Inj 2022; 17:e22-e29. [PMID: 35747584 PMCID: PMC9213117 DOI: 10.1055/s-0042-1747959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Accepted: 06/08/2021] [Indexed: 12/01/2022] Open
Abstract
Background
The rabbit sciatic nerve injury model may represent a valuable alternative for critical gap distance seen in humans but often leads to automutilation. In this study, we modified the complete sciatic nerve injury model for avoiding autophagy.
Materials and Methods
In 20 adult female New Zealand White rabbits, instead of transecting the complete sciatic nerve, we unilaterally transected the tibial portion and preserved the peroneal portion. Thereby loss of sensation in the dorsal aspect of the paw was avoided. The tibial portion was repaired in a reversed autograft approach in a length of 2.6 cm. In an alternative repair approach, a gap of 2.6 cm in length was repaired with a chitosan-based nerve guide.
Results
During the 6-month follow-up period, there were no incidents of autotomy. Nerve regeneration of the tibial portion of the sciatic nerve was evaluated histologically and morphometrically. A clear difference between the distal segments of the healthy contralateral and the repaired tibial portion of the sciatic nerve was detectable, validating the model.
Conclusion
By transecting the isolated tibial portion of the rabbit sciatic nerve and leaving the peroneal portion intact, it was possible to eliminate automutilation behavior.
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Affiliation(s)
- Jonathan A Sorkin
- Research Center for Nerve Reconstruction, Department of Neurosurgery, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Ziv Rechany
- Research Center for Nerve Reconstruction, Department of Neurosurgery, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Mara Almog
- Research Center for Nerve Reconstruction, Department of Neurosurgery, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Nina Dietzmeyer
- Institute of Neuroanatomy and Cell Biology, Hannover Medical School, Hannover, Germany.,Center for Systems Neuroscience (ZSN), Hannover, Germany
| | - Yuval Shapira
- Division of Peripheral Nerve Reconstruction, Department of Neurosurgery, Tel Aviv Sourasky Medical Center, Tel Aviv University, Tel Aviv, Israel
| | - Kirsten Haastert-Talini
- Institute of Neuroanatomy and Cell Biology, Hannover Medical School, Hannover, Germany.,Center for Systems Neuroscience (ZSN), Hannover, Germany
| | - Shimon Rochkind
- Research Center for Nerve Reconstruction, Department of Neurosurgery, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel.,Division of Peripheral Nerve Reconstruction, Department of Neurosurgery, Tel Aviv Sourasky Medical Center, Tel Aviv University, Tel Aviv, Israel
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3
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Nasab ST, Roodbari NH, Goodarzi V, Khonakdar HA, Nourani MR. Nanobioglass enhanced polyurethane/collagen conduit in sciatic nerve regeneration. J Biomed Mater Res B Appl Biomater 2021; 110:1093-1102. [PMID: 34877767 DOI: 10.1002/jbm.b.34983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Accepted: 09/09/2021] [Indexed: 11/11/2022]
Abstract
The main purpose of neural tissue engineering and regenerative medicine is the development of biological substitutions to preserve, improve, and regenerate the damaged functions of tissues and organs. Three novel conduits, including polyurethane (PU), polyurethane/collagen (PU/C), and polyurethane/collagen/nano-bio glass (PU/C/NBG), were fabricated by the electrospinning technique. After confirming the suitability of conduits in the in-vitro environment, conduits were surgically sutured in a 10-mm gap in the sciatic nerve of a rat to evaluate their role in sciatic nerve reconstruction. After 4, 8, and 12 weeks of surgery, nerve regeneration was assessed by the hot plate test, sciatic functional index, electromyography, histology, and immunohistochemistry against S100, NF200, and CD31 antibodies. The results of various examinations revealed that the PU/C/NBG conduit is significantly more suitable than PU and PU/C conduits in terms of nerve regeneration. However, all three groups of conduits had the potential to be used for nerve regeneration. Overall, this study discovered that the PU/C/NBG conduit is a biocompatible neural conduit, which is a favorable candidate for peripheral nerve regeneration and axonal growth.
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Affiliation(s)
- Somayeh Tofighi Nasab
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Nasim Hayati Roodbari
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Vahabodin Goodarzi
- Tissue Engineering Department, Nanobiotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | | | - Mohammad Reza Nourani
- Tissue Engineering Department, Nanobiotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
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Liu F, Wang X. Synthetic Polymers for Organ 3D Printing. Polymers (Basel) 2020; 12:E1765. [PMID: 32784562 PMCID: PMC7466039 DOI: 10.3390/polym12081765] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 07/27/2020] [Accepted: 07/29/2020] [Indexed: 12/20/2022] Open
Abstract
Three-dimensional (3D) printing, known as the most promising approach for bioartificial organ manufacturing, has provided unprecedented versatility in delivering multi-functional cells along with other biomaterials with precise control of their locations in space. The constantly emerging 3D printing technologies are the integration results of biomaterials with other related techniques in biology, chemistry, physics, mechanics and medicine. Synthetic polymers have played a key role in supporting cellular and biomolecular (or bioactive agent) activities before, during and after the 3D printing processes. In particular, biodegradable synthetic polymers are preferable candidates for bioartificial organ manufacturing with excellent mechanical properties, tunable chemical structures, non-toxic degradation products and controllable degradation rates. In this review, we aim to cover the recent progress of synthetic polymers in organ 3D printing fields. It is structured as introducing the main approaches of 3D printing technologies, the important properties of 3D printable synthetic polymers, the successful models of bioartificial organ printing and the perspectives of synthetic polymers in vascularized and innervated organ 3D printing areas.
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Affiliation(s)
- Fan Liu
- Center of 3D Printing & Organ Manufacturing, School of Fundamental Sciences, China Medical University (CMU), No. 77 Puhe Road, Shenyang North New Area, Shenyang 110122, China;
- Department of Orthodontics, School of Stomatology, China Medical University, No. 117 North Nanjing Street, Shenyang 110003, China
| | - Xiaohong Wang
- Center of 3D Printing & Organ Manufacturing, School of Fundamental Sciences, China Medical University (CMU), No. 77 Puhe Road, Shenyang North New Area, Shenyang 110122, China;
- Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
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5
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Li Q, Li L, Yu M, Zheng M, Li Y, Yang J, Dai M, Zhong L, Sun L, Lu D. Elastomeric polyurethane porous film functionalized with gastrodin for peripheral nerve regeneration. J Biomed Mater Res A 2020; 108:1713-1725. [PMID: 32196902 DOI: 10.1002/jbm.a.36937] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 03/06/2020] [Accepted: 03/09/2020] [Indexed: 12/12/2022]
Affiliation(s)
- Qing Li
- Science and Technology Achievement Incubation CenterKunming Medical University Kunming China
| | - Limei Li
- Science and Technology Achievement Incubation CenterKunming Medical University Kunming China
| | - Mali Yu
- Science and Technology Achievement Incubation CenterKunming Medical University Kunming China
| | - Meng Zheng
- Science and Technology Achievement Incubation CenterKunming Medical University Kunming China
| | - Yao Li
- Department of StomatologyThe First People's Hospital of Yunnan Provience Kunming China
| | - Jian Yang
- Department of Biomedical EngineeringMaterials Research Institute, The Huck Institutes of The Life Sciences, The Pennsylvania State University University Park Pennsylvania USA
| | - Min Dai
- Department of Second CardiologyThe Third People's Hospital of Kunming Kunming China
| | - Lianmei Zhong
- Department of NeurologyThe First Affiliated Hospital, Kunming Medical University Kunming China
| | - Lin Sun
- Department of CardiologyThe Second Affiliated Hospital, Kunming Medical University Kunming China
| | - Di Lu
- Science and Technology Achievement Incubation CenterKunming Medical University Kunming China
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6
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Amani H, Kazerooni H, Hassanpoor H, Akbarzadeh A, Pazoki-Toroudi H. Tailoring synthetic polymeric biomaterials towards nerve tissue engineering: a review. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2020; 47:3524-3539. [PMID: 31437011 DOI: 10.1080/21691401.2019.1639723] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The nervous system is known as a crucial part of the body and derangement in this system can cause potentially lethal consequences or serious side effects. Unfortunately, the nervous system is unable to rehabilitate damaged regions following seriously debilitating disorders such as stroke, spinal cord injury and brain trauma which, in turn, lead to the reduction of quality of life for the patient. Major challenges in restoring the damaged nervous system are low regenerative capacity and the complexity of physiology system. Synthetic polymeric biomaterials with outstanding properties such as excellent biocompatibility and non-immunogenicity find a wide range of applications in biomedical fields especially neural implants and nerve tissue engineering scaffolds. Despite these advancements, tailoring polymeric biomaterials for design of a desired scaffold is fundamental issue that needs tremendous attention to promote the therapeutic benefits and minimize adverse effects. This review aims to (i) describe the nervous system and related injuries. Then, (ii) nerve tissue engineering strategies are discussed and (iii) physiochemical properties of synthetic polymeric biomaterials systematically highlighted. Moreover, tailoring synthetic polymeric biomaterials for nerve tissue engineering is reviewed.
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Affiliation(s)
- Hamed Amani
- Department of Medical Nanotechnology, Faculty of Advanced Technologies in Medicine, Iran University of Medical Science , Tehran , Iran
| | - Hanif Kazerooni
- Biotechnology Group, Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic) , Tehran , Iran
| | - Hossein Hassanpoor
- Department of Cognitive Science, Dade Pardazi, Shenakht Mehvar, Atynegar (DSA) Institute , Tehran , Iran
| | - Abolfazl Akbarzadeh
- Department of Medical Nanotechnology, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences , Tabriz , Iran
| | - Hamidreza Pazoki-Toroudi
- Physiology Research Center and Department of Physiology, Faculty of Medicine, Iran University of Medical Sciences , Tehran , Iran
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7
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Wang X. Advanced Polymers for Three-Dimensional (3D) Organ Bioprinting. MICROMACHINES 2019; 10:E814. [PMID: 31775349 PMCID: PMC6952999 DOI: 10.3390/mi10120814] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 11/17/2019] [Accepted: 11/19/2019] [Indexed: 02/06/2023]
Abstract
Three-dimensional (3D) organ bioprinting is an attractive scientific area with huge commercial profit, which could solve all the serious bottleneck problems for allograft transplantation, high-throughput drug screening, and pathological analysis. Integrating multiple heterogeneous adult cell types and/or stem cells along with other biomaterials (e.g., polymers, bioactive agents, or biomolecules) to make 3D constructs functional is one of the core issues for 3D bioprinting of bioartificial organs. Both natural and synthetic polymers play essential and ubiquitous roles for hierarchical vascular and neural network formation in 3D printed constructs based on their specific physical, chemical, biological, and physiological properties. In this article, several advanced polymers with excellent biocompatibility, biodegradability, 3D printability, and structural stability are reviewed. The challenges and perspectives of polymers for rapid manufacturing of complex organs, such as the liver, heart, kidney, lung, breast, and brain, are outlined.
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Affiliation(s)
- Xiaohong Wang
- Center of 3D Printing & Organ Manufacturing, School of Fundamental Sciences, China Medical University (CMU), No. 77 Puhe Road, Shenyang North New Area, Shenyang 110122, China; or ; Tel./Fax: +86-24-31900983
- Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
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8
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Lee TH, Yen CT, Hsu SH. Preparation of Polyurethane-Graphene Nanocomposite and Evaluation of Neurovascular Regeneration. ACS Biomater Sci Eng 2019; 6:597-609. [DOI: 10.1021/acsbiomaterials.9b01473] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tsung-Han Lee
- Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan, Republic of China
| | - Chen-Tung Yen
- Department of Life Science, National Taiwan University, Taipei, Taiwan, Republic of China
| | - Shan-hui Hsu
- Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan, Republic of China
- Research and Development Center for Medical Devices, National Taiwan University, Taipei, Taiwan, Republic of China
- Institute of Cellular and System Medicine, National Health Research Institutes, Zhunan, Taiwan, Republic of China
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9
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Herzberger J, Sirrine JM, Williams CB, Long TE. Polymer Design for 3D Printing Elastomers: Recent Advances in Structure, Properties, and Printing. Prog Polym Sci 2019. [DOI: 10.1016/j.progpolymsci.2019.101144] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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10
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Houshyar S, Bhattacharyya A, Shanks R. Peripheral Nerve Conduit: Materials and Structures. ACS Chem Neurosci 2019; 10:3349-3365. [PMID: 31273975 DOI: 10.1021/acschemneuro.9b00203] [Citation(s) in RCA: 97] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Peripheral nerve injuries (PNIs) are the most common injury types to affect the nervous system. Restoration of nerve function after PNI is a challenging medical issue. Extended gaps in transected peripheral nerves are only repaired using autologous nerve grafting. This technique, however, in which nerve tissue is harvested from a donor site and grafted onto a recipient site in the same body, has many limitations and disadvantages. Recent studies have revealed artificial nerve conduits as a promising alternative technique to substitute autologous nerves. This Review summarizes different types of artificial nerve grafts used to repair peripheral nerve injuries. These include synthetic and natural polymers with biological factors. Then, desirable properties of nerve guides are discussed based on their functionality and effectiveness. In the final part of this Review, fabrication methods and commercially available nerve guides are described.
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Affiliation(s)
- Shadi Houshyar
- School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia
| | - Amitava Bhattacharyya
- Nanoscience and Technology, Department of Electronics and Communication, PSG College of Technology, Coimbatore − 641004, India
| | - Robert Shanks
- School of Science, RMIT University, Melbourne, Victoria 3000, Australia
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11
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Duffy P, McMahon S, Wang X, Keaveney S, O'Cearbhaill ED, Quintana I, Rodríguez FJ, Wang W. Synthetic bioresorbable poly-α-hydroxyesters as peripheral nerve guidance conduits; a review of material properties, design strategies and their efficacy to date. Biomater Sci 2019; 7:4912-4943. [DOI: 10.1039/c9bm00246d] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Implantable tubular devices known as nerve guidance conduits (NGCs) have drawn considerable interest as an alternative to autografting in the repair of peripheral nerve injuries.
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Affiliation(s)
- Patrick Duffy
- The Charles Institute of Dermatology
- School of Medicine
- University College Dublin
- Dublin
- Ireland
| | - Seán McMahon
- Ashland Specialties Ireland Ltd
- Synergy Centre
- Dublin
- Ireland
| | - Xi Wang
- The Charles Institute of Dermatology
- School of Medicine
- University College Dublin
- Dublin
- Ireland
| | - Shane Keaveney
- School of Mechanical & Materials Engineering
- UCD Centre for Biomedical Engineering
- UCD Conway Institute of Biomolecular and Biomedical Research
- University College Dublin
- Dublin
| | - Eoin D. O'Cearbhaill
- School of Mechanical & Materials Engineering
- UCD Centre for Biomedical Engineering
- UCD Conway Institute of Biomolecular and Biomedical Research
- University College Dublin
- Dublin
| | - Iban Quintana
- IK4-Tekniker
- Surface Engineering and Materials Science Unit
- Eibar
- Spain
| | | | - Wenxin Wang
- The Charles Institute of Dermatology
- School of Medicine
- University College Dublin
- Dublin
- Ireland
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12
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Dixon AR, Jariwala SH, Bilis Z, Loverde JR, Pasquina PF, Alvarez LM. Bridging the gap in peripheral nerve repair with 3D printed and bioprinted conduits. Biomaterials 2018; 186:44-63. [DOI: 10.1016/j.biomaterials.2018.09.010] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 09/06/2018] [Accepted: 09/07/2018] [Indexed: 01/14/2023]
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13
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Kaczmarek B, Sionkowska A. Chitosan/collagen blends with inorganic and organic additive-A review. ADVANCES IN POLYMER TECHNOLOGY 2017. [DOI: 10.1002/adv.21912] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- B. Kaczmarek
- Department of Chemistry of Biomaterials and Cosmetics; Faculty of Chemistry; Nicolaus Copernicus University in Toruń; Toruń Poland
| | - A. Sionkowska
- Department of Chemistry of Biomaterials and Cosmetics; Faculty of Chemistry; Nicolaus Copernicus University in Toruń; Toruń Poland
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14
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Hsu SH, Chang WC, Yen CT. Novel flexible nerve conduits made of water-based biodegradable polyurethane
for peripheral nerve regeneration. J Biomed Mater Res A 2017; 105:1383-1392. [DOI: 10.1002/jbm.a.36022] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 01/20/2017] [Accepted: 01/26/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Shan-hui Hsu
- Institute of Polymer Science and Engineering; National Taiwan University; Taipei Taiwan
| | - Wen-Chi Chang
- Institute of Polymer Science and Engineering; National Taiwan University; Taipei Taiwan
| | - Chen-Tung Yen
- Department of Life Science and Institute of Zoology; National Taiwan University; Taipei Taiwan
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15
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Sheikh Z, Khan AS, Roohpour N, Glogauer M, Rehman IU. Protein adsorption capability on polyurethane and modified-polyurethane membrane for periodontal guided tissue regeneration applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 68:267-275. [DOI: 10.1016/j.msec.2016.05.026] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2016] [Revised: 03/29/2016] [Accepted: 05/05/2016] [Indexed: 10/21/2022]
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16
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Yan Y, Hong Wang X, Yin D, Zhang R. A New Polyurethane/Heparin Vascular Graft for Small-Caliber Vein Repair. J BIOACT COMPAT POL 2016. [DOI: 10.1177/0883911507078386] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Small-caliber (1.2 mm inner diameter) vein grafts, made from a mixture of heparin and polyurethane with superior compliance, excellent antithrombogenicity and biocompatibility, have been developed. Eighteen rabbits were used; 12 for the heparin containing grafts and the other six were pure polyurethane grafts as controls. Each graft segment (2 cm in length) was implanted into the femoral veins using a newly developed anastomosis method. Sodium heparin was given before surgery, but no anticoagulant was used thereafter. All the rabbits lived during the whole experimental period of 1 year. Histological analyses of vessels retrieved 2, 4, 8, 12 and 24 weeks after implantation revealed regeneration of endothelial-like cells (in 2 weeks), elastin-like tissues (in 8 weeks), and neoadventitia-like layers (in 12 weeks). The patency rate for the heparin containing grafts was 100%, but was only 83.3% in the no heparin controls. These results indicate that “ideal” small diameter blood vessels can be synthesized and used directly without cellularization before implantation. By the properly selecting scaffold materials, a native vein can repair itself spontaneously to certain degree.
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Affiliation(s)
- Yngnian Yan
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Organ Manufacturing Engineering, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China
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Trindade AB, Schestatsky P, Torres VF, Gomes C, Gianotti GC, Paz AHDR, Terraciano PB, Marques JMV, Guimarães KM, Graça DL, Cirne-Lima EO, Contesini EA. Functional and regenerative effects of local administration of autologous mononuclear bone marrow cells combined with silicone conduit on transected femoral nerve of rabbits. Res Vet Sci 2015; 102:27-33. [DOI: 10.1016/j.rvsc.2015.07.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Revised: 06/03/2015] [Accepted: 07/09/2015] [Indexed: 02/01/2023]
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18
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Wang X, Huang Y, Liu C. A combined rotational mold for manufacturing a functional liver system. J BIOACT COMPAT POL 2015. [DOI: 10.1177/0883911515578872] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A combined rotational mold system for liver manufacturing was prepared. The combined rotational mold system was composed of a branched internal mold, a basement mold, and a series of external molds with increasing diameters. Semi-spindle constructs, consisting of multiple cell types, such as adipose-derived stem cells and hepatocytes encapsulated in a fibrin hydrogel, were created by sequentially sandwiching cell-laden fibrin hydrogels between the combined rotational mold system based on the Weissenberg effect of non-Newtonian fluid. A spindle liver lobe precursor was constructed, with a multi-scale vascular network including arteries, veins, and capillaries, by integrating the two semi-spindle constructs together and coating the spindle construct with a layer of poly(DL-lactide-co-glycolide acid) solution. The spindle liver lobe precursor was characterized by a series of in vivo experiments. This first report is the preparation of a functioning complex organ, such as the liver, that was produced using an inexpensive, simple, and effective method.
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Affiliation(s)
- Xiaohong Wang
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing, P.R. China
- State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Yuanwen Huang
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing, P.R. China
| | - Chang Liu
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing, P.R. China
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19
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Synthesis, properties and applications of biodegradable polymers derived from diols and dicarboxylic acids: from polyesters to poly(ester amide)s. Int J Mol Sci 2014; 15:7064-123. [PMID: 24776758 PMCID: PMC4057662 DOI: 10.3390/ijms15057064] [Citation(s) in RCA: 122] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Revised: 03/31/2014] [Accepted: 03/31/2014] [Indexed: 01/22/2023] Open
Abstract
Poly(alkylene dicarboxylate)s constitute a family of biodegradable polymers with increasing interest for both commodity and speciality applications. Most of these polymers can be prepared from biobased diols and dicarboxylic acids such as 1,4-butanediol, succinic acid and carbohydrates. This review provides a current status report concerning synthesis, biodegradation and applications of a series of polymers that cover a wide range of properties, namely, materials from elastomeric to rigid characteristics that are suitable for applications such as hydrogels, soft tissue engineering, drug delivery systems and liquid crystals. Finally, the incorporation of aromatic units and α-amino acids is considered since stiffness of molecular chains and intermolecular interactions can be drastically changed. In fact, poly(ester amide)s derived from naturally occurring amino acids offer great possibilities as biodegradable materials for biomedical applications which are also extensively discussed.
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20
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Beigi MH, Ghasemi-Mobarakeh L, Prabhakaran MP, Karbalaie K, Azadeh H, Ramakrishna S, Baharvand H, Nasr-Esfahani MH. In vivo integration of poly(ε-caprolactone)/gelatin nanofibrous nerve guide seeded with teeth derived stem cells for peripheral nerve regeneration. J Biomed Mater Res A 2014; 102:4554-67. [PMID: 24677613 DOI: 10.1002/jbm.a.35119] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Revised: 01/29/2014] [Accepted: 02/04/2014] [Indexed: 12/25/2022]
Abstract
Artificial nanofiber nerve guides have gained huge interest in bridging nerve gaps and associated peripheral nerve regeneration due to its high surface area, flexibility and porous structure. In this study, electrospun poly (ε-caprolactone)/gelatin (PCL/Gel) nanofibrous mats were fabricated, rolled around a copper wire and fixed by medical grade adhesive to obtain a tubular shaped bio-graft, to bridge 10 mm sciatic nerve gap in in vivo rat models. Stem cells from human exfoliated deciduous tooth (SHED) were transplanted to the site of nerve injury through the nanofibrous nerve guides. In vivo experiments were performed in animal models after creating a sciatic nerve gap, such that the nerve gap was grafted using (i) nanofiber nerve guide (ii) nanofiber nerve guide seeded with SHED (iii) suturing, while an untreated nerve gap remained as the negative control. In vitro cell culture study was carried out for primary investigation of SHED-nanofiber interaction and its viability within the nerve guides after 2 and 16 weeks of implantation time. Walking track analysis, plantar test, electrophysiology and immunohistochemistry were performed to evaluate functional recovery during nerve regeneration. Vascularization was also investigated by hematoxilin/eosine (H&E) staining. Overall results showed that the SHED seeded on nanofibrous nerve guide could survive and promote axonal regeneration in rat sciatic nerves, whereby the biocompatible PCL/Gel nerve guide with cells can support axonal regeneration and could be a promising tissue engineered graft for peripheral nerve regeneration.
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Affiliation(s)
- Mohammad-Hossein Beigi
- Department of Cellular Biotechnology at Cell Science Research Center, Royan Institute for Biotechnology, ACECR, Isfahan, Iran; Materials Engineering Department, Najafabad Branch, Islamic Azad University, Najafabad, Iran
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Sartori S, Chiono V, Tonda-Turo C, Mattu C, Gianluca C. Biomimetic polyurethanes in nano and regenerative medicine. J Mater Chem B 2014; 2:5128-5144. [DOI: 10.1039/c4tb00525b] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Nature's inspiration is a promising tool to design new biomaterials especially for frontier technological areas such as tissue engineering and nanomedicine.
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Affiliation(s)
- Susanna Sartori
- Politecnico di Torino
- Dep. of Mechanical and Aerospace Engineering
- Turin, Italy
| | - Valeria Chiono
- Politecnico di Torino
- Dep. of Mechanical and Aerospace Engineering
- Turin, Italy
| | - Chiara Tonda-Turo
- Politecnico di Torino
- Dep. of Mechanical and Aerospace Engineering
- Turin, Italy
| | - Clara Mattu
- Politecnico di Torino
- Dep. of Mechanical and Aerospace Engineering
- Turin, Italy
| | - Ciardelli Gianluca
- Politecnico di Torino
- Dep. of Mechanical and Aerospace Engineering
- Turin, Italy
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22
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Huang Y, He K, Wang X. Rapid prototyping of a hybrid hierarchical polyurethane-cell/hydrogel construct for regenerative medicine. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:3220-9. [DOI: 10.1016/j.msec.2013.03.048] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 03/15/2013] [Accepted: 03/29/2013] [Indexed: 01/14/2023]
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23
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Wang X, He K, Zhang W. Optimizing the fabrication processes for manufacturing a hybrid hierarchical polyurethane–cell/hydrogel construct. J BIOACT COMPAT POL 2013. [DOI: 10.1177/0883911513491359] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
It is essential to control the overall composition and internal architecture for complex organ manufacturing. In this study, several subprocesses were optimized to produce hybrid hierarchical polyurethane–cell/hydrogel constructs with an intrinsic network of grid and branched channels using a double-nozzle low-temperature deposition rapid prototyping system. The formation quality was mainly determined by the polymer concentration and composition. However, the cell viability was mainly determined by the formation time. Cell sensitivities to the inner nozzle diameter and extrusion flux were not significantly different within the given parameter ranges. The integrity of the two material systems can be varied by the formation routes and layer thickness. Under the optimal fabrication parameters, such as formation time within 20 min and gelatin:alginate:fibrinogen ratio of 2:1:1, a high cell survival rate of 80% was attained. The design and fabrication strategies used to create such a complex heterogeneous objects directly from a computer-aided design model represent a promising route for robotic hybrid hierarchical construct implementations, which would allow easy expansion of the subprocessing capabilities and scale up manufacturing capabilities.
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Affiliation(s)
- Xiaohong Wang
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing, P.R. China
- Business Innovation Technology (BIT) Research Centre, School of Science, Aalto University, Aalto, Finland
- State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Kai He
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing, P.R. China
| | - Weiming Zhang
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing, P.R. China
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Abstract
Different from the existing tissue engineering strategies, rapid prototyping (RP) techniques aim to automatically produce complex organs directly from computer-aided design freeform models with high resolution and sophistication. Analogous to building a nuclear power plant, cell biology (especially, renewable stem cells), implantable biomaterials, tissue engineering, and single/double/four nozzle RP techniques currently enable researchers in the field to realize a part of the task of complex organ manufacturing. To achieve this multifaceted undertaking, a multi-nozzle rapid prototyping system which can simultaneously integrate an anti-suture vascular system, multiple cell types, and a cocktail of growth factors in a construct should be developed. This article reviews the pros and cons of the existing cell-laden RP techniques for complex organ manufacturing. It is hoped that with the comprehensive multidisciplinary efforts, the implants can virtually replace the functions of a solid internal organ, such as the liver, heart, and kidney.
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Affiliation(s)
- Xiaohong Wang
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing, China.
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25
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Gualandi C, Soccio M, Govoni M, Valente S, Lotti N, Munari A, Giordano E, Pasquinelli G, Focarete ML. Poly(butylene/diethylene glycol succinate) multiblock copolyester as a candidate biomaterial for soft tissue engineering: Solid-state properties, degradability, and biocompatibility. J BIOACT COMPAT POL 2012. [DOI: 10.1177/0883911512440536] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A multiblock bioresorbable copolyester, poly(butylene/diethylene glycol succinate), was synthesized by reactive blending, and it was used, together with the corresponding poly(butylene succinate) homopolymer, to form films and to fabricate biomimetic electrospun scaffolds. The poly(butylene/diethylene glycol succinate) scaffold had a more pronounced elastomeric behavior than poly(butylene succinate). It also underwent hydrolytic degradation faster than poly(butylene succinate) since the incorporated diethylene glycol succinate units rendered the copolymer more hydrophilic than poly(butylene succinate). The films degraded faster than electrospun samples due to the autocatalytic effect of carboxylic end-groups. The biodegradable poly(butylene/diethylene glycol succinate) scaffold supported the growth and preserved the cardiac phenotype markers of H9c2 cells, demonstrating its potential utility in soft tissue engineering applications.
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Affiliation(s)
- Chiara Gualandi
- Department of Chemistry “G Ciamician” and National Consortium of Materials Science and Technology (INSTM, RU Bologna), University of Bologna, Bologna, Italy
- Advanced Applications in Mechanical Engineering and Materials Technology Interdepartmental Center for Industrial Research (CIRI MAM), University of Bologna, Bologna, Italy
| | - Michelina Soccio
- Department of Civil, Environmental, and Materials Engineering (DICAM), University of Bologna, Bologna, Italy
| | | | - Sabrina Valente
- Anaestesiological and Surgical Sciences, University of Bologna, Bologna, Italy
| | - Nadia Lotti
- Department of Civil, Environmental, and Materials Engineering (DICAM), University of Bologna, Bologna, Italy
| | - Andrea Munari
- Department of Civil, Environmental, and Materials Engineering (DICAM), University of Bologna, Bologna, Italy
| | | | - Gianandrea Pasquinelli
- Clinical Department of Radiological and Histocytomorphological Sciences, University of Bologna, Bologna, Italy
| | - Maria Letizia Focarete
- Department of Chemistry “G Ciamician” and National Consortium of Materials Science and Technology (INSTM, RU Bologna), University of Bologna, Bologna, Italy
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26
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WANG X, Mäkitie AA, Paloheimo KS, Tuomi J, Paloheimo M, Sui S. A tubular PLGA-sandwiched cell/hydrogel fabrication technique based on a step-by-step mold/extraction process. ADVANCES IN POLYMER TECHNOLOGY 2011. [DOI: 10.1002/adv.20213] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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27
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Kai He, Xiaohong Wang. Rapid prototyping of tubular polyurethane and cell/hydrogel constructs. J BIOACT COMPAT POL 2011. [DOI: 10.1177/0883911511412553] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A tubular polyurethane (PU) sandwich-like, adipose-derived stem cell (ADSC)/gelatin/alginate/ fibrin construct was fabricated using a double-nozzle, low-temperature (—20°C) deposition technique. The ADSCs survived the fabrication and cryopreservation stages by incorporating a cryoprotectant (glycerol or dimethyl sulfoxide (DMSO)) in the cell/hydrogel system. With 5% DMSO or 10% glycerol alone in the hydrogel, the cell viabilities were retained (73% and 62%, respectively). The three-dimensional construct was effectively preserved below —80°C for more than 1 week. After the freeze/thaw processes, cell viability and proliferation ability were regained. This strategy has the potential to be widely used in complex organ manufacturing techniques.
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Affiliation(s)
- Kai He
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China
| | - Xiaohong Wang
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China, Business Innovation Technology Research Centre, Aalto University School of Science and Technology, PO Box 15500, 00076 Aalto, Finland,
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28
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Poly(amidoamine) Hydrogels as Scaffolds for Cell Culturing and Conduits for Peripheral Nerve Regeneration. INT J POLYM SCI 2011. [DOI: 10.1155/2011/161749] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Biodegradable and biocompatible poly(amidoamine)-(PAA-) based hydrogels have been considered for different tissue engineering applications. First-generation AGMA1 hydrogels, amphoteric but prevailing cationic hydrogels containing carboxylic and guanidine groups as side substituents, show satisfactory results in terms of adhesion and proliferation properties towards different cell lines. Unfortunately, these hydrogels are very swellable materials, breakable on handling, and have been found inadequate for other applications. To overcome this problem, second-generation AGMA1 hydrogels have been prepared adopting a new synthetic method. These new hydrogels exhibit good biological propertiesin vitrowith satisfactory mechanical characteristics. They are obtained in different forms and shapes and successfully testedin vivofor the regeneration of peripheral nerves. This paper reports on our recent efforts in the use of first-and second-generation PAA hydrogels as substrates for cell culturing and tubular scaffold for peripheral nerve regeneration.
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29
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Wang X, Yan Y, Zhang R. Recent trends and challenges in complex organ manufacturing. TISSUE ENGINEERING PART B-REVIEWS 2010; 16:189-97. [PMID: 19824803 DOI: 10.1089/ten.teb.2009.0576] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Presently, there is a recognized and imperative need for bioartificial organs. The technological advances in transgenosis, tissue engineering, and rapid prototyping have led to the development of spatially complex tissues. An ideal artificial organ should provide nutrient transport system, mechanical stable architecture, and synergetic multicellular organization in one construct. The multinozzle rapid prototyping technique simultaneously assembles vascular systems including hierarchical multicellular structures in an automated and reproducible manner and offers an effective way for treating organ failures. In this article, a brief overview of the recent trends and outstanding challenges in organ manufacturing is provided. From the viewpoint of disciplinary crossing, integration, and development, future directions in the coming years were pointed out.
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Affiliation(s)
- Xiaohong Wang
- Center of Organ Manufacturing & Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, P.R. China
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30
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Xiaohong Wang, Shaochun Sui, Yongnian Yan, Renji Zhang. Design and Fabrication of PLGA Sandwiched Cell/Fibrin Constructs for Complex Organ Regeneration. J BIOACT COMPAT POL 2010. [DOI: 10.1177/0883911510365661] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A poly(DL-lactic-co-glycolic acid) (PLGA) sandwich fibrinogen/ adipose stem cell (ADSC) construct was fabricated to generate smooth muscle tissue. The mechanical properties and ADSC compatibility of PLGA, poly(ethylene glycol-1,6-hexamethyl diisocyanate-caprolactone) i.e. polyurethane (PU), gelatin, alginate, and fibrin composites were evaluated for vascular smooth muscle tissue generation. Synthetic PLGA and PU combined with natural gelatin, alginate, and fibrin for strength and cell compatibility were found to be effective. A trilayer construct was designed and built with a microporous inner PLGA layer to provide nutrient, oxygen, and metabolite transfer while the outer PLGA layer with no pores prevented leakage during in vitro culture and in vivo implantation. The fibrin layer suitably accommodated ADSC growth, migration, proliferation, and differentiation inside the construct. This design has the potential for wide use in tissue engineering and complex organ construction.
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Affiliation(s)
- Xiaohong Wang
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China, Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China,
| | - Shaochun Sui
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China, Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
| | - Yongnian Yan
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China, Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
| | - Renji Zhang
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China, Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
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31
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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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32
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Mäkitie AA, Yan Y, Wang X, Xiong Z, Paloheimo KS, Tuomi J, Paloheimo M, Salo J, Renkonen R. In Vitro Evaluation of a 3D PLGA–TCP Composite Scaffold in an Experimental Bioreactor. J BIOACT COMPAT POL 2009. [DOI: 10.1177/0883911508101745] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A 3D poly(lactic acid-co-glycolic acid)/tricalcium phosphate (PLGA-TCP) composite scaffold, generated with the low-temperature deposition modeling rapid prototyping technique, was tested for its viability in a 3D cell cultivation in vitro. The aim was to find optimal cell culture conditions for the selected scaffold material and to monitor cell division, differentiation, and migration of selected cell types in this environment. In addition, the behavior and cell-matrix interactions of selected cell types were monitored as well as the biodegradation rate of the tested scaffold material. Chinese hamster ovary cells as well as a human cell line 293 epithelial cells were cultured on the scaffolds. A variety of different preconditioning protocols were deployed to prepare the scaffolds before seeding with the cells. Cell cultivations were conducted for 1–4 weeks and the coverage of the luminal surfaces was analyzed with light microscopy. Long cultivation periods were required to achieve partial coverage of the luminal surfaces of the scaffolds. Tissue engineering with 3D cell cultures and biomaterials represents a promising approach for organ manufacturing research. It may have potential for eventual on-demand high-throughput production of artificial tissues but the process has many challenges. The culture system in a well controlled bioreactor environment is discussed.
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Affiliation(s)
- Antti A. Mäkitie
- Helsinki University of Technology, BIT Research Centre, P.O. Box 5500 02015 Espoo, Finland, Department of Otolaryngology, Helsinki University Hospital, Helsinki, Finland and Department of Otolaryngology Turku University Hospital, Turku, Finland
| | - Yongnian Yan
- Department of Mechanical Engineering, University of Tsinghua Beijing, China
| | - Xiaohong Wang
- Department of Mechanical Engineering, University of Tsinghua Beijing, China
| | - Zhuo Xiong
- Department of Mechanical Engineering, University of Tsinghua Beijing, China
| | - Kaija-Stiina Paloheimo
- Helsinki University of Technology, BIT Research Centre, P.O. Box 5500 Espoo 02015, Finland
| | - Jukka Tuomi
- Helsinki University of Technology, BIT Research Centre, P.O. Box 5500 Espoo 02015, Finland
| | - Markku Paloheimo
- Helsinki University of Technology, BIT Research Centre, P.O. Box 5500 Espoo 02015, Finland
| | - Jari Salo
- Department of Orthopaedics and Traumatology, Helsinki University Hospital Helsinki, Finland
| | - Risto Renkonen
- Transplantation laboratory & Infection Biology Research Program, Haartman Institute, University of Helsinki & HUSLAB, Helsinki University Central Hospital, Helsinki, Finland
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33
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Cui T, Wang X, Tan Y, Zhang R. Rapid Prototyping a Double-layer Polyurethane—collagen Conduit and its Schwann Cell Compatibility. J BIOACT COMPAT POL 2009. [DOI: 10.1177/0883911509102349] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A new double-layer conduit that combined an outer synthetic Polyurethane (PU) layer and inner natural collagen layer was fabricated via a double-nozzle low-temperature deposition manufacturing (DLDM) technology. The outer PU layer provided a mechanically stable tunnel against scar tissue invasion in vivo, while the inner collagen layer promoted Schwann cell adhesion, migration, and proliferation. Microporous structures were found in both the layers. A tight connection between the double layers was achieved by adjusting the distance between the two deposit nozzles and adjusting other processing parameters. Schwann cells from rat sciatic nerves were cultured in the layered PU-collagen conduits for one week; a significant enhancement in their retention and viability was seen compared to those made of pure PU. The poly(urethane-collagen) double layer conduit had better Schwann cell compatibility and so has a great potential use in clinical peripheral nerve repair.
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Affiliation(s)
- Tongkui Cui
- Key Laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing Department of Mechanical Engineering, Tsinghua University Beijing 100084, P.R. China
- Institute of Life Science & Medicine Tsinghua University, Beijing 100084, P.R. China
| | - Xlaohong Wang
- Key Laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing Department of Mechanical Engineering, Tsinghua University Beijing 100084, P.R. China
- Institute of Life Science & Medicine Tsinghua University, Beijing 100084, P.R. China
| | - Yongnian Tan
- Key Laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing Department of Mechanical Engineering, Tsinghua University Beijing 100084, P.R. China
- Institute of Life Science & Medicine Tsinghua University, Beijing 100084, P.R. China
| | - Renji Zhang
- Key Laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing Department of Mechanical Engineering, Tsinghua University Beijing 100084, P.R. China
- Institute of Life Science & Medicine Tsinghua University, Beijing 100084, P.R. China
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34
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Zhang Y, Qi J, Liu X, Xiong Z, Li S, Zhou J, Liang Y. Three-dimensional Reconstruction of Functional Fascicular Groups inside a Segment of Common Peroneal Nerve. J BIOACT COMPAT POL 2009. [DOI: 10.1177/0883911509103944] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The virtual human plan has been the hot point of recent research. The objective of this study is to explore the possibility of three-dimensional (3D) reconstruction of functional fascicular groups inside short segmental peripheral nerve. A 5 cm length of common peroneal nerve was horizontally sliced at 0.25 mm intervals, and each section was stained with acetycholinesterase histochemical staining. The 2D panorama images were acquired by high-resolution digital camera under 100 x microscope and mosaic software; different functional fascicular groups were distinguished and marked. The topographic database was then matched using image processing software, through the 3D reconstruction achieved using 3D reconstruction software (Amira 3.1). The reconstructed 3D images could be rotated or zoomed in any direction and the intercross and recombination processes of nerve bundles could be observed. Based on the serial histological sections and computer technology, the 3D microstructure of short segmental peripheral nerve functional fascicular groups was reconstructed. These results provide the possibility of 3D reconstruction of long segmental peripheral nerve functional fascicular groups.
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Affiliation(s)
- Yi Zhang
- Department of Plastic and Reconstructive Surgery, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510080, P.R. China
| | - Jian Qi
- Department of Microsurgery, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510080, P.R. China
| | - Xiaolin Liu
- Department of Microsurgery, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510080, P.R. China
| | - Zuo Xiong
- Department of Mechanical Engineering Tsinghua University, Beijing 100084, P.R. China
| | - Shengjie Li
- Department of Mechanical Engineering Tsinghua University, Beijing 100084, P.R. China
| | - Jiaming Zhou
- Sun Yat-sen Medical College, Sun Yat-Sen University, Guangzhou 510080, P.R. China
| | - Yingjie Liang
- Department of Pathology, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510080, P.R. China
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35
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Xu M, Van Y, Liu H, Yag R, Wang X. Controlled Adipose-derived Stromal Cells Differentiation into Adipose and Endothelial Cells in a 3D Structure Established by Cell-assembly Technique. J BIOACT COMPAT POL 2009. [DOI: 10.1177/0883911509102794] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
One of the major obstacles in engineering thick and complex tissues while vascularizing tissues in vitro is to maintain cell viability during tissue growth and structural organization. Adipose-derived stromal (ADS) cells were used to establish a multicellular system through a cell-assembly technique. Attempts were made to control ADS cells differentiation into different targeted cell types according to their positions within an orderly 3D structure. Oil red 0 staining confirmed that the ADS cells in the structure differentiated into adipocytes with a spherical shape while immunostaining tests confirmed that the endothelial growth factor induced ADS cells on the walls of channels differentiated into mature endothelial cells and then organized into tubular structures throughout the engineered 3D structure. The endothelin-1 and nitric oxide release rules of the endothelial cells were coincidental with those in vivo. This study provides a new approach to engineer orderly endothelial vessel networks in vitro and has potential applications in adipose-tissue engineering.
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Affiliation(s)
- Mingen Xu
- Key laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing Department of Mechanical Engineering, Tsinghua University Beijing 100084, P.R. China
- Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
- Center Laboratory of Tissue Engineering, Hangzhou Dianzi University, Hangzhou 310018, P.R. China
| | - Yongnian Van
- Key laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing Department of Mechanical Engineering, Tsinghua University Beijing 100084, P.R. China
- Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
| | - Haixia Liu
- Key laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing Department of Mechanical Engineering, Tsinghua University Beijing 100084, P.R. China
- Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
| | - Rui Yag
- Key laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing Department of Mechanical Engineering, Tsinghua University Beijing 100084, P.R. China
- Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
| | - Xiaohong Wang
- Key laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing Department of Mechanical Engineering, Tsinghua University Beijing 100084, P.R. China
- Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
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36
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Cui T, Yan Y, Zhang R, Liu L, Xu W, Wang X. Rapid Prototyping of a Double-Layer Polyurethane–Collagen Conduit for Peripheral Nerve Regeneration. Tissue Eng Part C Methods 2009; 15:1-9. [DOI: 10.1089/ten.tec.2008.0354] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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37
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Xiahong Wang, Tongkui Cui, Yongnian Yan, Renji Zhang. Peroneal Nerve Regeneration Using a Unique Bilayer Polyurethane-collagen Guide Conduit. J BIOACT COMPAT POL 2009. [DOI: 10.1177/0883911508101183] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Unique double layer polyurethane (PU)-collagen nerve guide conduits with desirable biocompatibility and mechanical properties were fabricated using a newly developed double-nozzle low-temperature deposition manufacturing (DLDM) technique. The inner collagen layer of the conduit had oriented nano-size filaments with micro-pores (pore size 20—100μm) that permitted nutrient infiltration, while the outer PU layer had micro-pores (pore size 15—20 μm) preventing fibrous tissue invasion. In vivo animal tests (n = 6) on bridging a 10 mm long peroneal nerve defect was conducted using rats. Single layer pure PU conduit (n = 6) was used as the positive control and the same size defect with no implantation (n = 2) as the negative control. Through walk track analysis as well as electrophysiological and histological evaluations of the regenerated nerves, the double layer PU-collagen conduit demonstrated better nerve repair than the controls. This new PU-collagen has the potential for significant clinical applications in peripheral nerve repair.
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Affiliation(s)
- Xiahong Wang
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China, , Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
| | - Tongkui Cui
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China, Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
| | - Yongnian Yan
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China, Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
| | - Renji Zhang
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China, Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
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38
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Ren YJ, Zhou ZY, Cui FZ, Ying Wang, Zhao JP, Xu QY. Hyaluronic Acid/Polylysine Hydrogel as a Transfer System for Transplantation of Neural Stem Cells. J BIOACT COMPAT POL 2009. [DOI: 10.1177/0883911508099472] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Graft integration and survival are major factors that limit cell therapy for diseases and injury in the central nervous system. Efforts to improve graft survival and integration have focused on the development of biocompatible scaffolds to support neural cells. In this study, rat neural stem cells (NSC), including neurospheres and single cells, were seeded into hyaluronic acid/polylysine hydrogels. Confocal microscopy was used to noninvasively investigate the key cell phonotypes. After culture for 5 days, single NSC had survived and differentiated into neurons and astrocytes, while neurosphereforming cells had migrated from their original aggregate and maintained the NSC phonotype. These studies, carried out in the absence of serum, identified HA/polylysine hydrogels as potential synthetic cell carriers for transplantation of NSC.
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Affiliation(s)
- Yong-Juan Ren
- Biomaterials Laboratory, Department of Materials Science and Engineering, Tsinghua University Beijing 100084, People's Republic of China
| | - Zi-You Zhou
- Biomaterials Laboratory, Department of Materials Science and Engineering, Tsinghua University Beijing 100084, People's Republic of China
| | - Fu-Zhai Cui
- Biomaterials Laboratory, Department of Materials Science and Engineering, Tsinghua University Beijing 100084, People's Republic of China,
| | - Ying Wang
- Beijing Institute of Neuroscience, Capital Medical University Beijing 100054, People's Republic of China
| | - Jun-Peng Zhao
- Beijing Institute of Neuroscience, Capital Medical University Beijing 100054, People's Republic of China
| | - Qun-Yuan Xu
- Beijing Institute of Neuroscience, Capital Medical University Beijing 100054, People's Republic of China
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39
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Zhenhuan Zheng, Yujun Wei, Gan Wang, Aijun Wang Qiang Ao, Yandao Gong, Xiufang Zhang. Surface Properties of Chitosan Films Modified with Polycations and Their Effects on the Behavior of PC12 Cells. J BIOACT COMPAT POL 2009. [DOI: 10.1177/0883911508099653] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A series of composite films were prepared by blending chitosan with three polycations, poly(L-lysine), polyethyleneimine, and poly-L-ornithine, in specific blend proportions. The surface properties of the composite films, including surface topography, chemistry, and wettability, were examined by atomic force microscopy, X-ray photoelectron spectroscopy, and contact angle assay, respectively. For all composite films, blending with different polycations produced different nanoscaled surface topographical features (particles, granules, fibers, and islands) in addition to inducing changes in surface chemistry and wettability. PC12 cells were cultured on these composite films to evaluate the effects of surface properties on cell behavior. The PC12 cell behavior was holistically affected by surface topography, chemistry, and wettability; the cells also displayed responses to surface topography. On the surfaces with fiber topographic features, the PC12 cells exhibited significantly higher levels of adhesion, proliferation, and differentiation when compared to particle, granule, or island dominant surfaces. It appears that the surface topography of chitosan and chitosan-derived materials may play an important role in regulating nerve cell behavior and that topographic modification can be utilized for the applications of chitosan and chitosan-derived materials in nerve or other tissue regeneration.
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Affiliation(s)
- Zhenhuan Zheng
- Department of Biological Sciences and Biotechnology, State Key Laboratory of Biomembrane and Membrane Biotechnology Tsinghua University, Beijing 100084, People's Republic of China
| | - Yujun Wei
- Department of Biological Sciences and Biotechnology, State Key Laboratory of Biomembrane and Membrane Biotechnology Tsinghua University, Beijing 100084, People's Republic of China
| | - Gan Wang
- Department of Biological Sciences and Biotechnology, State Key Laboratory of Biomembrane and Membrane Biotechnology Tsinghua University, Beijing 100084, People's Republic of China
| | - Aijun Wang Qiang Ao
- Department of Biological Sciences and Biotechnology, State Key Laboratory of Biomembrane and Membrane Biotechnology Tsinghua University, Beijing 100084, People's Republic of China
| | - Yandao Gong
- Department of Biological Sciences and Biotechnology, State Key Laboratory of Biomembrane and Membrane Biotechnology Tsinghua University, Beijing 100084, People's Republic of China
| | - Xiufang Zhang
- Department of Biological Sciences and Biotechnology, State Key Laboratory of Biomembrane and Membrane Biotechnology Tsinghua University, Beijing 100084, People's Republic of China
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40
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Kawazoe N, Xiaoting Lin, Tateishi T, Guoping Chen. Three-dimensional Cultures of Rat Pancreatic RIN-5F Cells in Porous PLGA-collagen Hybrid Scaffolds. J BIOACT COMPAT POL 2009. [DOI: 10.1177/0883911508099439] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Three-dimensional cultures of pancreatic islet cells in porous scaffolds or hydrogels have been constructed as a biohybrid artificial pancreas. A thin mesh of a PLGA-collagen hybrid was used to culture rat RIN-5F cells. The hybrid mesh was coated with laminin, fibronectin, vitronectin, type IV collagen, and poly(L-lysine) were evaluated and mesh without coating was used as a control. Cell adhered and proliferated on all of the coated and uncoated meshes. The cells formed spheroids in the uncoated, poly(L-lysine)-, fibronectin-, vitronectin-, and type IV collagen-coated hybrid meshes, while forming a layered structure in the laminin-coated hybrid mesh. Cell adhesion on the coated PLGA-collagen hybrid meshes was higher than that for the uncoated hybrid mesh. The laminin-coated hybrid mesh showed the greatest level of adhesion. The insulin secretion capacity of RIN-5F cells was at the same level for all coated and uncoated PLGA-collagen hybrid meshes and higher than that of cells cultured on cell culture plates. The 3D cultured PLGA-collagen hybrid meshes promoted insulin production capacity. Gene expression analysis showed that genes encoding insulin I, insulin II, and the pancreatic transcription factor PDX-1 (pancreas/duodenum homeobox 1) was expressed. These results indicate that the PLGA-collagen hybrid meshes support adhesion, proliferation, and differentiation of RIN-5F cells that allows culturing pancreatic islet cells on 3D constructs.
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Affiliation(s)
- Naoki Kawazoe
- Biomaterials Center, National Institute for Materials Science 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Xiaoting Lin
- Biomaterials Center, National Institute for Materials Science 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Tetsuya Tateishi
- Biomaterials Center, National Institute for Materials Science 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Guoping Chen
- Biomaterials Center, National Institute for Materials Science 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan,
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41
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Wei Xu, Xiaohong Wang, Yongnian Yan, Renji Zhang. A Polyurethane-Gelatin Hybrid Construct for Manufacturing Implantable Bioartificial Livers. J BIOACT COMPAT POL 2008. [DOI: 10.1177/0883911508095517] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A novel 3D hybrid construct was developed for liver manufacturing by depositing biodegradable polyurethane (PU) and a naturally derived polymer gelatin simultaneously via a double nozzle rapid prototyping (RP) technique. A grid object was produced by precisely and simultaneously dispersing the PU and gelatin to form 3D constructs with interconnected macro-channels at a low temperature (-28°C). Micro-pores were formed by freeze-drying the constructs. The PU polymer provided mechanical support while gelatin provided accommodation for implant cells. The hydrophilicity of the hybrid constructs was between the pure PU and pure gelatin structures. The interconnected channels allow nutrients and oxygen to be supplied throughout the construct as well as provide space for the attachment of cells. The design and fabrication strategies, used to create complex physical objects directly from computer aided design (CAD) models, represent a promising technique for implantable bioartificial livers. It is anticipated that these PU-gelatin hybrid constructs will serve as a useful model for bioartificial liver manufacturing.
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Affiliation(s)
- Wei Xu
- Key Laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing Department of Mechanical Engineering, Tsinghua University Beijing 100084, P.R. China, Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
| | - Xiaohong Wang
- Key Laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing Department of Mechanical Engineering, Tsinghua University Beijing 100084, P.R. China, , Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
| | - Yongnian Yan
- Key Laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing Department of Mechanical Engineering, Tsinghua University Beijing 100084, P.R. China, Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
| | - Renji Zhang
- Key Laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing Department of Mechanical Engineering, Tsinghua University Beijing 100084, P.R. China, Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
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42
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Yeganeh H, Orang F, Solouk A, Rafienia M. Synthesis, Characterization and Preliminary Investigation of Blood Compatibility of Novel Epoxy-modified Polyurethane Networks. J BIOACT COMPAT POL 2008. [DOI: 10.1177/0883911508091829] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
To prepare elastomers with acceptable physical properties and good blood compatibility, polyurethane networks were synthesized via crosslinking reaction of epoxy-terminated polyurethane prepolymers (EUPs) and hexamethylene diamine. EUPs were prepared by reacting glycidol and NCO-terminated polyurethanes. All new materials were characterized by conventional spectroscopic methods and properties were evaluated and correlated to their structure. Cytotoxcicity evaluation for the films of samples based on mouse fibroblasts (L929) revealed that these elastomers posed no threat to these cells. In vitro platelet-rich plasma contact test showed reduced number of adhered platelets on the surface of the films, particularly for those with maximum crystallinity and microphase structures and high hydrophilicity. The results obtained implied the potential for the utilization of these elastomers in biomedical applications.
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Affiliation(s)
- Hamid Yeganeh
- Polyurethane Department, Iran Polymer and Petrochemical Institute PO Box: 14965/115, Tehran, Iran,
| | - Fariba Orang
- Biomaterials Department, Faculty of Medical Engineering, Amir Kabir University of Technology, Tehran, Iran
| | - Atefeh Solouk
- Biomaterials Department, Faculty of Medical Engineering, Amir Kabir University of Technology, Tehran, Iran
| | - Mohammad Rafienia
- Biomaterials Department, Faculty of Medical Engineering, Amir Kabir University of Technology, Tehran, Iran
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43
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Wei Xu, Xiao Wang, Yongnian Yan, Renji Zhang. Rapid Prototyping of Polyurethane for the Creation of Vascular Systems. J BIOACT COMPAT POL 2008. [DOI: 10.1177/0883911507088271] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A precise control over the internal architecture was essential for manufacture of complex organs. To create vascular systems that mimic human livers, we designed and fabricated complex 3D objects with an intrinsic network of interconnected channels. A new elastomeric polyurethane, mainly based on polycaprolactone and poly(ethylene glycol) with excellent biocompatibility and tunable biodegradation properties, was used to fabricate these vascular systems using a low temperature deposition system based on the layer-by-layer manufacturing principle. A specific model was selected via computer aided design (CAD), solid free form fabrication processes are conducted under computer direction. Two example object patterns were produced by precision controlled dispensing of a biodegradable polyurethane into 3D multi-micro-tunnels with multi-micro-pores at a low temperature (-28°C). The design and fabrication strategies used to create physical objects directly from CAD models represent a promising route for the establishment of complex organ vascular systems.
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Affiliation(s)
- Wei Xu
- Key Laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China, Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
| | - Xiao Wang
- Key Laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China, , Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
| | - Yongnian Yan
- Key Laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China, Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
| | - Renji Zhang
- Key Laboratory for Advanced Materials Processing Technology Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China, Institute of Life Science & Medicine, Tsinghua University Beijing 100084, P.R. China
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Comparison of biodegradable conduits within aged rat sciatic nerve defects. Plast Reconstr Surg 2008; 121:706-707. [PMID: 18301022 DOI: 10.1097/01.prs.0000294965.69617.46] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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45
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Wang X, Yan Y, Zhang R. Rapid prototyping as a tool for manufacturing bioartificial livers. Trends Biotechnol 2007; 25:505-13. [PMID: 17949840 DOI: 10.1016/j.tibtech.2007.08.010] [Citation(s) in RCA: 98] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2007] [Revised: 07/25/2007] [Accepted: 08/31/2007] [Indexed: 12/20/2022]
Abstract
Rapid prototyping (RP) technologies are a set of manufacturing processes that can produce very complex structures directly from computer-aided design models without structure-specific tools or knowledge. These technologies might eventually enable the manufacture of human livers to create functional substitutes for treating liver failure or dysfunctionality. However, the approaches used currently face many challenges, such as the complex branched vascular and bile ductular systems and the variety of cell types, matrices and regulatory factors involved in liver development. Here, we discuss the challenges and provide evidence for the usefulness of RP in overcoming them.
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Affiliation(s)
- Xiaohong Wang
- Key Laboratory for Advanced Materials Processing Technology, Ministry of Education & Center of Organ Manufacturing, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China.
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