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van Bochove B, Rongen JJ, Hannink G, Seppälä JV, Poot AA, Grijpma DW. In Vitro and In Vivo Degradation of Photo-Crosslinked Poly(Trimethylene Carbonate-co-ε-Caprolactone) Networks. Macromol Biosci 2024; 24:e2300364. [PMID: 37923394 DOI: 10.1002/mabi.202300364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 10/11/2023] [Indexed: 11/07/2023]
Abstract
Three-armed poly(trimethylene carbonate) (PTMC) and poly(trimethylene carbonate-co-Ɛ-caprolactone) (P(TMC-co-ε-CL)) macromers with molecular weights of approximately 30 kg mol-1 are synthesized by ring-opening polymerization and subsequent functionalization with methacrylic anhydride. Networks are then prepared by photo-crosslinking. To investigate the in vitro and in vivo degradation properties of these photo-crosslinked networks and assess the effect of ε-caprolactone content on the degradation properties, PTMC networks, and copolymer networks with two different TMC:ε-CL ratios are prepared. PTMC networks degraded slowly, via an enzymatic surface erosion process, both in vitro and in vivo. Networks prepared from P(TMC-co-ε-CL) macromers with a 74:26 ratio are found to degrade slowly as well, via a surface erosion process, albeit at a higher rate compared to PTMC networks. Increasing the ε-CL content to a ratio of 52:48, resulted in a faster degradation. These networks lost their mechanical properties much sooner than the other networks. Thus, PTMC and P(TMC-co-ε-CL) networks are interesting networks for tissue engineering purposes and the exact degradation properties can be tuned by varying the TMC:ε-CL ratio, providing researchers with a tool to obtain copolymer networks with the desired degradation rate depending on the intended application.
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Affiliation(s)
- Bas van Bochove
- Advanced Organ Bioengineering and Therapeutics, Faculty of Science and Technology, University of Twente, Drienerlolaan 5, Enschede, 7522 NB, The Netherlands
- Polymer Technology, School of Chemical Engineering, Aalto University, Otakaari 1 B, Espoo, 02150, Finland
| | - Jan J Rongen
- Orthopedic Research Laboratory, Radboud University Medical Center, Geert Grooteplein Zuid 10, Nijmegen, 6525 GA, The Netherlands
| | - Gerjon Hannink
- Department of Medical Imaging, Radboud University Medical Center, Geert Grooteplein Zuid 10, Nijmegen, 6525 GA, The Netherlands
| | - Jukka V Seppälä
- Polymer Technology, School of Chemical Engineering, Aalto University, Otakaari 1 B, Espoo, 02150, Finland
| | - André A Poot
- Advanced Organ Bioengineering and Therapeutics, Faculty of Science and Technology, University of Twente, Drienerlolaan 5, Enschede, 7522 NB, The Netherlands
| | - Dirk W Grijpma
- Advanced Organ Bioengineering and Therapeutics, Faculty of Science and Technology, University of Twente, Drienerlolaan 5, Enschede, 7522 NB, The Netherlands
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2
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Li W, Lin M, Wang C, Lu Y, Sui Y, Ni X, Guo J, Jiang M, Yang L, Cui H. In vitro enzymatic degradation of the PTMC/cross-linked PEGDA blends. Front Bioeng Biotechnol 2023; 11:1253221. [PMID: 37736328 PMCID: PMC10509478 DOI: 10.3389/fbioe.2023.1253221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 08/22/2023] [Indexed: 09/23/2023] Open
Abstract
Introduction: Poly(1,3-trimethylene carbonate) (PTMC) is a flexible amorphous polymer with good degradability and biocompatibility. The degradation of PTMC is critical for its application as a degradable polymer, more convenient and easy-to-control cross-linking strategies for preparing PTMC are required. Methods: The blends of poly(trimethylene carbonate) (PTMC) and cross-linked poly(ethylene glycol) diacrylate (PEGDA) were prepared by mixing photoactive PEGDA and PTMC and subsequently photopolymerizing the mixture with uv light. The physical properties and in vitro enzymatic degradation of the resultant PTMC/cross-linked PEGDA blends were investigated. Results: The results showed that the gel fraction of PTMC/cross-linked PEGDA blends increased while the swelling degree decreased with the content of PEGDA dosage. The results of in vitro enzymatic degradation confirmed that the degradation of PTMC/cross-linked PEGDA blends in the lipase solution occurred under the surface erosion mechanism, and the introduction of the uv cross-linked PEGDA significantly improved the resistance to lipase erosion of PTMC; the higher the cross-linking degree, the lower the mass loss. Discussion: The results indicated that the blends/cross-linking via PEGDA is a simple and effective strategy to tailor the degradation rate of PTMC.
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Affiliation(s)
- Wei Li
- Liaoning Research Institute of Family Planning, The Affiliated Reproductive Hospital of China Medical University, Shenyang, China
| | - Meina Lin
- Liaoning Research Institute of Family Planning, The Affiliated Reproductive Hospital of China Medical University, Shenyang, China
| | - Chenchao Wang
- Department of Plastic Surgery, First Hospital of China Medical University, Shenyang, China
| | - Yongping Lu
- Liaoning Research Institute of Family Planning, The Affiliated Reproductive Hospital of China Medical University, Shenyang, China
| | - Yu Sui
- Liaoning Research Institute of Family Planning, The Affiliated Reproductive Hospital of China Medical University, Shenyang, China
| | - Xiang Ni
- Liaoning Research Institute of Family Planning, The Affiliated Reproductive Hospital of China Medical University, Shenyang, China
| | - Jing Guo
- Liaoning Research Institute of Family Planning, The Affiliated Reproductive Hospital of China Medical University, Shenyang, China
| | - Miao Jiang
- Liaoning Research Institute of Family Planning, The Affiliated Reproductive Hospital of China Medical University, Shenyang, China
| | - Liqun Yang
- Liaoning Research Institute of Family Planning, The Affiliated Reproductive Hospital of China Medical University, Shenyang, China
| | - Hong Cui
- Department of Obstetrics and Gynecology, Shengjing Hospital of China Medical University, Shenyang, China
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Jiang D, Zou H, Zhang H, Zhao W, Lan Y, Yuan M. Preparation and Properties of Electrospun PLLA/PTMC Scaffolds. Polymers (Basel) 2022; 14. [PMID: 36297984 DOI: 10.3390/polym14204406] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 07/03/2022] [Accepted: 10/14/2022] [Indexed: 11/25/2022] Open
Abstract
Poly(L-lactide) (PLLA) and PLLA/poly(trimethylene carbonate) (PTMC) scaffolds characterised by different PLLA:PTMC mass ratios (10:0, 9:1, 8:2, 7:3, 6:4 and 5:5) were prepared via electrospinning. The results showed that increasing the PTMC content in the spinning solution caused the following effects: (1) the diameter of the prepared PLLA/PTMC electrospun fibres gradually increased from 188.12 ± 48.87 nm (10:0) to 584.01 ± 60.68 nm (5:5), (2) electrospun fibres with uniform diameters and no beads could be prepared at the PTMC contents of >30%, (3) the elastic modulus of the fibre initially increased and then decreased, reaching a maximum value of 74.49 ± 8.22 Mpa (5:5) and (4) the elongation at the breaking point of the fibres increased gradually from 24.71% to 344.85%. Compared with the PLLA electrospun fibrous membrane, the prepared PLLA/PTMC electrospun fibrous membrane exhibited considerably improved mechanical properties while maintaining good histocompatibility.
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Dienel K, Abu-Shahba A, Kornilov R, Björkstrand R, van Bochove B, Snäll J, Wilkman T, Mesimäki K, Meller A, Lindén J, Lappalainen A, Partanen J, Seppänen-Kaijansinkko R, Seppälä J, Mannerström B. Patient-Specific Bioimplants and Reconstruction Plates for Mandibular Defects: Production Workflow and In Vivo Large Animal Model Study. Macromol Biosci 2022; 22:e2100398. [PMID: 35023297 DOI: 10.1002/mabi.202100398] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 12/15/2021] [Indexed: 11/12/2022]
Abstract
A major challenge with extensive craniomaxillofacial bone reconstruction is the limited donor-site availability to reconstruct defects predictably and accurately according to the anatomical shape of the patient. Here, patient-specific composite bioimplants, consisting of cross-linked poly(trimethylene carbonate) (PTMC) networks and β-tricalcium phosphate (β-TCP), were tested in vivo in twelve Göttingen minipigs in a large mandibular continuity defect model. The 25 mm defects were supported by patient-specific titanium reconstruction plates and received either osteoconductive composite bioimplants (PTMC+TCP), neat polymer network bioimplants (PTMC), autologous bone segments (positive control) or were left empty (negative control). Post-operatively, defects treated with bioimplants showed evident ossification at 24 weeks. Histopathologic evaluation revealed that neat PTMC bioimplant surfaces were largely covered with fibrous tissue, while in the PTMC+TCP bioimplants, bone attached directly to the implant surface showing good osteoconduction and histological signs of osteoinductivity. However, PTMC+TCP bioimplants were associated with high incidence of necrosis and infection, possibly due to rapid resorption and/or particle size of the used β-TCP. The study highlights the importance of testing bone regeneration implants in a clinically relevant large animal model and at the in situ reconstruction site, since results on small animal models and studies in non-loadbearing areas do not translate directly. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Kasper Dienel
- Polymer Technology, School of Chemical Engineering, Aalto University, Finland
| | - Ahmed Abu-Shahba
- Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital, Finland.,Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Tanta University, Egypt
| | - Roman Kornilov
- Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital, Finland
| | - Roy Björkstrand
- Department of Mechanical Engineering, Aalto University, Finland
| | - Bas van Bochove
- Polymer Technology, School of Chemical Engineering, Aalto University, Finland
| | - Johanna Snäll
- Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital, Finland
| | - Tommy Wilkman
- Department of Oral and Maxillofacial Surgery, Helsinki University Hospital, Helsinki, Finland
| | - Karri Mesimäki
- Department of Oral and Maxillofacial Surgery, Helsinki University Hospital, Helsinki, Finland
| | - Anna Meller
- Laboratory Animal Center, HiLIFE, University of Helsinki, Helsinki, Finland
| | - Jere Lindén
- Department of Veterinary Biosciences, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland.,Finnish Centre for Laboratory Animal Pathology, HiLIFE, University of Helsinki, Helsinki, Finland
| | - Anu Lappalainen
- Department of Equine and Small Animal Medicine, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | - Jouni Partanen
- Department of Mechanical Engineering, Aalto University, Finland
| | | | - Jukka Seppälä
- Polymer Technology, School of Chemical Engineering, Aalto University, Finland
| | - Bettina Mannerström
- Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital, Finland
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Teotia AK, Dienel K, Qayoom I, van Bochove B, Gupta S, Partanen J, Seppälä J, Kumar A. Improved Bone Regeneration in Rabbit Bone Defects Using 3D Printed Composite Scaffolds Functionalized with Osteoinductive Factors. ACS Appl Mater Interfaces 2020; 12:48340-48356. [PMID: 32993288 DOI: 10.1021/acsami.0c13851] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Large critical size bone defects are complicated to treat, and in many cases, autografts become a challenge due to size and availability. In such situations, a synthetic bone implant that can be patient-specifically designed and fabricated with control over parameters such as porosity, rigidity, and osteogenic cues can act as a potential synthetic bone substitute. In this study, we produced photocuring composite resins with poly(trimethylene carbonate) containing high ratios of bioactive ceramics and printed porous 3D composite scaffolds to be used as bone grafts. To enhance the overall surface area available for cell infiltration, the scaffolds were also filled with a macroporous cryogel. Furthermore, the scaffolds were functionalized with osteoactive factors: bone morphogenetic protein and zoledronic acid. The scaffolds were evaluated in vitro for biocompatibility and for functionality in vivo in critical bone defects (∼8 mm) in two clinically relevant rabbit models. These studies included a smaller study in rabbit tibia and a larger study in the rabbit cranium. It was observed that the bioactive molecule-functionalized 3D printed porous composite scaffolds provide an excellent conductive surface inducing higher bone formation and improved defect healing in both critical size long bones and cranial defects. Our findings provide strong evidence in favor of these composites as next generation synthetic bone substitutes.
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Affiliation(s)
- Arun Kumar Teotia
- Department of Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Kasper Dienel
- Polymer Technology, School of Chemical Engineering, Aalto University, Espoo 02150, Finland
| | - Irfan Qayoom
- Department of Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Bas van Bochove
- Polymer Technology, School of Chemical Engineering, Aalto University, Espoo 02150, Finland
| | - Sneha Gupta
- Department of Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Jouni Partanen
- Department of Mechanical Engineering, Aalto University, Espoo 02150, Finland
| | - Jukka Seppälä
- Polymer Technology, School of Chemical Engineering, Aalto University, Espoo 02150, Finland
| | - Ashok Kumar
- Department of Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
- Polymer Technology, School of Chemical Engineering, Aalto University, Espoo 02150, Finland
- Centre for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, Uttar Pradesh, India
- Centre for Nanosciences, Indian Institute of Technology Kanpur, Kanpur 208016, Uttar Pradesh, India
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Allijn I, Ribeiro M, Poot A, Passier R, Stamatialis D. Membranes for Modelling Cardiac Tissue Stiffness In Vitro Based on Poly(trimethylene carbonate) and Poly(ethylene glycol) Polymers. Membranes (Basel) 2020; 10:membranes10100274. [PMID: 33022962 PMCID: PMC7650615 DOI: 10.3390/membranes10100274] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 09/29/2020] [Accepted: 10/01/2020] [Indexed: 12/15/2022]
Abstract
Despite the increased expenditure of the pharmaceutical industry on research and development, the number of drugs for cardiovascular diseases that reaches the market is decreasing. A major issue is the limited ability of the current in vitro and experimental animal models to accurately mimic human heart disease, which hampers testing of the efficacy of potential cardiac drugs. Moreover, many non-heart-related drugs have severe adverse cardiac effects, which is a major cause of drugs’ retraction after approval. A main hurdle of current in vitro models is their inability to mimic the stiffness of in vivo cardiac tissue. For instance, poly(styrene) petri dishes, which are often used in these models, have a Young’s modulus in the order of GPa, while the stiffness of healthy human heart tissue is <50 kPa. In pathological conditions, such as scarring and fibrosis, the stiffness of heart tissue is in the >100 kPa range. In this study, we focus on developing new membranes, with a set of properties for mimicry of cardiac tissue stiffness in vitro, based on methacrylate-functionalized macromers and triblock-copolymers of poly(trimethylene carbonate) and poly(ethylene glycol). The new membranes have Young’s moduli in the hydrated state ranging from 18 kPa (healthy tissue) to 2.5 MPa (pathological tissue), and are suitable for cell contraction studies using human pluripotent stem-cell-derived cardiomyocytes. The membranes with higher hydrophilicity have low drug adsorption and low Young’s moduli and could be suitable for drug screening applications.
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Affiliation(s)
- Iris Allijn
- Bioartificial Organs, Biomaterials Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands;
- Correspondence:
| | - Marcelo Ribeiro
- Applied Stem Cell Technologies, University of Twente, 7500 AE Enschede, The Netherlands; (M.R.); (R.P.)
| | - André Poot
- Biomaterials and Regenerative Medicine, Biomaterials Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands;
| | - Robert Passier
- Applied Stem Cell Technologies, University of Twente, 7500 AE Enschede, The Netherlands; (M.R.); (R.P.)
| | - Dimitrios Stamatialis
- Bioartificial Organs, Biomaterials Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands;
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Li X, Chen H, Xie S, Wang N, Wu S, Duan Y, Zhang M, Shui L. Fabrication of Photo-Crosslinkable Poly(Trimethylene Carbonate)/Polycaprolactone Nanofibrous Scaffolds for Tendon Regeneration. Int J Nanomedicine 2020; 15:6373-6383. [PMID: 32904686 PMCID: PMC7457647 DOI: 10.2147/ijn.s246966] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 07/15/2020] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND The treatment of tendon injuries remains a challenging problem in clinical due to their slow and insufficient natural healing process. Scaffold-based tissue engineering provides a promising strategy to facilitate tendon healing and regeneration. However, many tissue engineering scaffolds have failed due to their poor and unstable mechanical properties. To address this, we fabricated nanofibrous polycaprolactone/methacrylated poly(trimethylene carbonate) (PCL/PTMC-MA) composite scaffolds via electrospinning. MATERIALS AND METHODS PTMC-MA was characterized by nuclear magnetic resonance. Fiber morphology of composite scaffolds was evaluated using scanning electron microscopy. The monotonic tensile test was performed for determining the mechanical properties of composite scaffolds. Cell viability and collagen deposition were assessed via PrestoBlue assay and enzyme-linked immunosorbent assay, respectively. RESULTS These PCL/PTMC-MA composite scaffolds had an increase in mechanical properties as PTMC-MA content increase. After photo-crosslinking, they showed further enhanced mechanical properties including creep resistance, which was superior to pure PCL scaffolds. It is worth noting that photo-crosslinked PCL/PTMC-MA (1:3) composite scaffolds had a Young's modulus of 31.13 ± 1.30 MPa and Max stress at break of 23.80 ± 3.44 MPa that were comparable with the mechanical properties of native tendon (Young's modulus 20-1200 MPa, max stress at break 5-100 MPa). In addition, biological experiments demonstrated that PCL/PTMC-MA composite scaffolds were biocompatible for cell adhesion, proliferation, and differentiation.
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Affiliation(s)
- Xing Li
- National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou510006, People’s Republic of China
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou510006, People’s Republic of China
| | - Honglin Chen
- Institute for Life Science, School of Medicine, South China University of Technology, Guangzhou510006, People’s Republic of China
| | - Shuting Xie
- National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou510006, People’s Republic of China
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou510006, People’s Republic of China
| | - Ning Wang
- Institute for Life Science, School of Medicine, South China University of Technology, Guangzhou510006, People’s Republic of China
| | - Sujuan Wu
- National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou510006, People’s Republic of China
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou510006, People’s Republic of China
| | - Yuyou Duan
- Institute for Life Science, School of Medicine, South China University of Technology, Guangzhou510006, People’s Republic of China
| | - Minmin Zhang
- School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou510006, People’s Republic of China
| | - Lingling Shui
- National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou510006, People’s Republic of China
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou510006, People’s Republic of China
- School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou510006, People’s Republic of China
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Guo Z, Grijpma D, Poot A. Leachable Poly(Trimethylene Carbonate)/CaCO 3 Composites for Additive Manufacturing of Microporous Vascular Structures. Materials (Basel) 2020; 13:ma13153435. [PMID: 32759759 PMCID: PMC7435882 DOI: 10.3390/ma13153435] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 07/10/2020] [Accepted: 07/27/2020] [Indexed: 01/21/2023]
Abstract
The aim of this work was to fabricate microporous poly(trimethylene carbonate) (PTMC) vascular structures by stereolithography (SLA) for applications in tissue engineering and organ models. Leachable CaCO3 particles with an average size of 0.56 μm were used as porogens. Composites of photocrosslinkable PTMC and CaCO3 particles were cast on glass plates, crosslinked by ultraviolet light treatment and leached in watery HCl solutions. In order to obtain interconnected pore structures, the PTMC/CaCO3 composites had to contain at least 30 vol % CaCO3. Leached PTMC films had porosities ranging from 33% to 71% and a pore size of around 0.5 μm. The mechanical properties of the microporous PTMC films matched with those of natural blood vessels. Resins based on PTMC/CaCO3 composites with 45 vol % CaCO3 particles were formulated and successfully used to build vascular structures of various shapes and sizes by SLA. The intrinsic permeabilities of the microporous PTMC films and vascular structures were at least one order of magnitude higher than reported for the extracellular matrix, indicating no mass transfer limitations in the case of cell seeding.
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9
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Park S, Kim JG. Mechanochemical synthesis of poly(trimethylene carbonate)s: an example of rate acceleration. Beilstein J Org Chem 2019; 15:963-970. [PMID: 31164933 PMCID: PMC6541340 DOI: 10.3762/bjoc.15.93] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 04/11/2019] [Indexed: 12/15/2022] Open
Abstract
Mechanochemical polymerization is a rapidly growing area and a number of polymeric materials can now be obtained through green mechanochemical synthesis. In addition to the general merits of mechanochemistry, such as being solvent-free and resulting in high conversions, we herein explore rate acceleration under ball-milling conditions while the conventional solution-state synthesis suffer from low reactivity. The solvent-free mechanochemical polymerization of trimethylene carbonate using the organocatalysts 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) are examined herein. The polymerizations under ball-milling conditions exhibited significant rate enhancements compared to polymerizations in solution. A number of milling parameters were evaluated for the ball-milling polymerization. Temperature increases due to ball collisions and exothermic energy output did not affect the polymerization rate significantly and the initial mixing speed was important for chain-length control. Liquid-assisted grinding was applied for the synthesis of high molecular weight polymers, but it failed to protect the polymer chain from mechanical degradation.
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Affiliation(s)
- Sora Park
- Department of Chemistry and Research Institute of Physics and Chemistry, Chonbuk National University, Jeon-Ju, Jeollabuk-do, 54896, Republic of Korea
| | - Jeung Gon Kim
- Department of Chemistry and Research Institute of Physics and Chemistry, Chonbuk National University, Jeon-Ju, Jeollabuk-do, 54896, Republic of Korea
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10
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Zhang X, Geven MA, Wang X, Qin L, Grijpma DW, Peijs T, Eglin D, Guillaume O, Gautrot JE. A drug eluting poly(trimethylene carbonate)/poly(lactic acid)-reinforced nanocomposite for the functional delivery of osteogenic molecules. Int J Nanomedicine 2018; 13:5701-5718. [PMID: 30288042 PMCID: PMC6161751 DOI: 10.2147/ijn.s163219] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Background Poly(trimethylene carbonate) (PTMC) has wide biomedical applications in the field of tissue engineering, due to its biocompatibility and biodegradability features. Its common manufacturing involves photofabrication, such as stereolithography (SLA), which allows the fabrication of complex and controlled structures. Despite the great potential of SLA-fabricated scaffolds, very few examples of PTMC-based drug delivery systems fabricated using photo-fabrication can be found ascribed to light-triggered therapeutics instability, degradation, side reaction, binding to the macromers, etc. These concerns severely restrict the development of SLA-fabricated PTMC structures for drug delivery purposes. Methods In this context, we propose here, as a proof of concept, to load a drug model (dexamethasone) into electrospun fibers of poly(lactic acid), and then to integrate these bioactive fibers into the photo-crosslinkable resin of PTMC to produce hybrid films. The hybrid films' properties and drug release profile were characterized; its biological activity was investigated via bone marrow mesenchymal stem cells culture and differentiation assays. Results The polymer/polymer hybrids exhibit improved properties compared with PTMC-only films, in terms of mechanical performance and drug protection from UV denaturation. We further validated that the dexamethasone preserved its biological activity even after photoreaction within the PTMC/poly(lactic acid) hybrid structures by investigating bone marrow mesenchymal stem cells proliferation and osteogenic differentiation. Conclusion This study demonstrates the potential of polymer-polymer scaffolds to simultaneously reinforce the mechanical properties of soft matrices and to load sensitive drugs in scaffolds that can be fabricated via additive manufacturing.
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Affiliation(s)
- Xi Zhang
- School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London, UK, .,Institute of Bioengineering, Queen Mary University of London, Mile End Road, London, UK,
| | - Mike A Geven
- Department of Biomaterials Science and Technology, University of Twente, Enschede, the Netherlands
| | - Xinluan Wang
- Translational Medicine R&D Center, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 5018057, China
| | - Ling Qin
- Translational Medicine R&D Center, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 5018057, China
| | - Dirk W Grijpma
- Department of Biomaterials Science and Technology, University of Twente, Enschede, the Netherlands
| | - Ton Peijs
- School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London, UK,
| | - David Eglin
- AO Research Institute Davos, Davos, Switzerland,
| | | | - Julien E Gautrot
- School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London, UK, .,Institute of Bioengineering, Queen Mary University of London, Mile End Road, London, UK,
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11
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Sartoneva R, Nordback PH, Haimi S, Grijpma DW, Lehto K, Rooney N, Seppänen-Kaijansinkko R, Miettinen S, Lahdes-Vasama T. Comparison of Poly(l-lactide-co-ɛ-caprolactone) and Poly(trimethylene carbonate) Membranes for Urethral Regeneration: An In Vitro and In Vivo Study. Tissue Eng Part A 2017; 24:117-127. [PMID: 28463605 DOI: 10.1089/ten.tea.2016.0245] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Urethral defects are normally reconstructed using a patient's own genital tissue; however, in severe cases, additional grafts are needed. We studied the suitability of poly(l-lactide-co-ɛ-caprolactone) (PLCL) and poly(trimethylene carbonate) (PTMC) membranes for urethral reconstruction in vivo. Further, the compatibility of the materials was evaluated in vitro with human urothelial cells (hUCs). The attachment and viability of hUCs and the expression of different urothelial cell markers (cytokeratin 7, 8, 19, and uroplakin Ia, Ib, and III) were studied after in vitro cell culture on PLCL and PTMC. For the in vivo study, 32 rabbits were divided into the PLCL (n = 15), PTMC (n = 15), and control or sham surgery (n = 2) groups. An oval urethral defect 1 × 2 cm in size was surgically excised and replaced with a PLCL or a PTMC membrane or urethral mucosa in sham surgery group. The rabbits were followed for 2, 4, and 16 weeks. After the follow-up, urethrography was performed to check the patency of the urethra. The defect area was excised for histological examination, where the epithelial integrity and structure, inflammation, and fibrosis were observed. There was no notable difference on hUCs attachment on PLCL and PTMC membranes after 1 day of cell seeding, further, the majority of hUCs were viable and maintained their urothelial phenotype on both biomaterials. Postoperatively, animals recovered well, and no severe strictures were discovered by urethrography. In histological examination, the urothelial integrity and structure developed toward a normal urothelium with only mild signs of fibrosis or inflammation. According to these results, PLCL and PTMC are both suitable for reconstructing urethral defects. There were no explicit differences between the PLCL and PTMC membranes. However, PTMC membranes were more flexible, easier to suture and shape, and developed significant epithelial integrity.
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Affiliation(s)
- Reetta Sartoneva
- 1 Adult Stem Cell Research Group, BioMediTech, Faculty of Medicine and Life Sciences, University of Tampere , Tampere, Finland .,2 Science Centre, Tampere University Hospital , Tampere, Finland
| | - Panu H Nordback
- 1 Adult Stem Cell Research Group, BioMediTech, Faculty of Medicine and Life Sciences, University of Tampere , Tampere, Finland .,2 Science Centre, Tampere University Hospital , Tampere, Finland
| | - Suvi Haimi
- 3 Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital , Helsinki, Finland
| | - Dirk W Grijpma
- 4 Department of Biomaterials Science and Technology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente , Enschede, The Netherlands .,5 Department of Biomedical Engineering, W.J. Kolff Institute, University Medical Centre Groningen, University of Groningen , Groningen, The Netherlands
| | - Kalle Lehto
- 1 Adult Stem Cell Research Group, BioMediTech, Faculty of Medicine and Life Sciences, University of Tampere , Tampere, Finland
| | | | - Riitta Seppänen-Kaijansinkko
- 3 Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital , Helsinki, Finland
| | - Susanna Miettinen
- 1 Adult Stem Cell Research Group, BioMediTech, Faculty of Medicine and Life Sciences, University of Tampere , Tampere, Finland .,2 Science Centre, Tampere University Hospital , Tampere, Finland
| | - Tuija Lahdes-Vasama
- 2 Science Centre, Tampere University Hospital , Tampere, Finland .,7 Pediatric and Adolescent Surgery Unit, Pediatric Research Centre and Tampere University Hospital , Tampere, Finland
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12
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Zhang Y, Liang RJ, Xu JJ, Shen LF, Gao JQ, Wang XP, Wang NN, Shou D, Hu Y. Efficient induction of antimicrobial activity with vancomycin nanoparticle-loaded poly(trimethylene carbonate) localized drug delivery system. Int J Nanomedicine 2017; 12:1201-1214. [PMID: 28243084 PMCID: PMC5315202 DOI: 10.2147/ijn.s127715] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Surgery and the local placement of an antibiotic are the predominant therapies to treat chronic osteomyelitis. Vancomycin-loaded N-trimethyl chitosan nanoparticles (VCM/TMC NPs) as a potential drug delivery system have high intracellular penetration and effective intracellular antibacterial activity. This study investigated the effects of a biocompatible material, poly(trimethylene carbonate) (PTMC), to increase the sustained effectiveness of an intracellular antibiotic and its potential application in antibiotic delivery. VCM/TMC NP-PTMC was characterized using scanning electron microscopy and Fourier transform infrared spectroscopy to determine the morphology, stability and chemical interaction of the drug with the polymer. Further, the biodegradation, antibacterial activity, protein adsorption, cell proliferation and drug release characteristics were evaluated. In addition, a Staphylococcus aureus-induced osteomyelitis rabbit model was used to investigate the antibiotic activity and bone repair capability of VCM/TMC NP-PTMC. The results showed that the composite beads of VCM/TMC NPs followed a sustained and slow release pattern and had excellent antibacterial activity and a higher protein adsorption and cell proliferation rate than the VCM-PTMC in vitro. Furthermore, VCM/TMC NP-PTMC inhibits bacteria and promotes bone repair in vivo. Thus, VCM/TMC NP-PTMC might be beneficial in periodontal management to reduce the bacterial load at the infection site and promote bone repair.
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Affiliation(s)
- Yang Zhang
- Department of Medicine, Zhejiang Academy of Traditional Chinese Medicine
| | - Ruo-jia Liang
- Department of Gynaecology, Zhejiang Provincial Hospital of Traditional Chinese Medicine, Hangzhou
| | | | - Li-feng Shen
- Department of Medicine, Zhejiang Academy of Traditional Chinese Medicine
| | - Jian-qing Gao
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, People’s Republic of China
| | - Xu-ping Wang
- Department of Medicine, Zhejiang Academy of Traditional Chinese Medicine
| | - Na-ni Wang
- Department of Medicine, Zhejiang Academy of Traditional Chinese Medicine
| | - Dan Shou
- Department of Medicine, Zhejiang Academy of Traditional Chinese Medicine
| | - Ying Hu
- Zhejiang Pharmaceutical College, Ningbo
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13
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ter Boo GA, Grijpma DW, Richards RG, Moriarty TF, Eglin D. Preparation of gentamicin dioctyl sulfosuccinate loaded poly(trimethylene carbonate) matrices intended for the treatment of orthopaedic infections. Clin Hemorheol Microcirc 2016; 60:89-98. [PMID: 25818154 DOI: 10.3233/ch-151935] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Infection is a common problem in trauma and orthopaedic surgery. Antibiotic-loaded biomaterials are used locally to clear infections as an adjunct to systemic antibiotics. Gentamicin-sulphate (GEN-SULPH) is commonly used in antibiotic-loaded biomaterials, although it displays high water solubility resulting in quick diffusion from the carrier. OBJECTIVE Preparation of a lipophilic derivative of gentamicin to reduce solubility and obtain a slower release. Subsequently, entrapment of this lipophilic gentamicin within poly(trimethylene carbonate) (PTMC) matrices. METHODS Hydrophobic ion-pairing was used to prepare lipophilic gentamicin (GEN-AOT). The susceptibility of Staphylococcus aureus NCTC 12973 and Staphylococcus epidermidis 103.1 for GEN-AOT was tested and the viability of fibroblasts upon exposure to GEN-AOT was assessed. GEN-AOT was then loaded into PTMC films. RESULTS GEN-AOT was successfully prepared as confirmed by FTIR-spectroscopy. GEN-AOT was bactericidal for S. epidermidis and S. aureus at 0.5 μM and 8.5 μM, respectively. At 1.1 μM GEN-AOT no reduction in fibroblast viability was observed. At 11 μM the reduction was ∼50% . PTMC discs loaded with GEN-AOT were prepared by compression molding. CONCLUSIONS Lipophilic GEN-AOT was at least as potent as GEN-SULPH. For S. epidermidis it was even more potent than GEN-SULPH. More than 50% fibroblast cell viability was maintained at bactericidal concentration for both bacterial strains.
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Affiliation(s)
- G A ter Boo
- AO Research Institute Davos, Davos-Platz, Switzerland.,Department of Biomaterials Science & Technology, University of Twente, Enschede, The Netherlands
| | - D W Grijpma
- Department of Biomaterials Science & Technology, University of Twente, Enschede, The Netherlands.,University of Groningen, University Medical Center Groningen, W.J. Kolff Institute, Department of Biomedical Engineering, Groningen, The Netherlands
| | - R G Richards
- AO Research Institute Davos, Davos-Platz, Switzerland
| | - T F Moriarty
- AO Research Institute Davos, Davos-Platz, Switzerland
| | - D Eglin
- AO Research Institute Davos, Davos-Platz, Switzerland
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Abstract
BACKGROUND: Advances in rapid-prototyping and 3D printing technologies have enhanced the possibilities in preparing designed architectures for tissue engineering applications. A major advantage in custom designing is the ability to create structures with desired mechanical properties. While the behaviour of a designed scaffold can be simulated using bulk material properties, it is important to verify the behaviour of a printed scaffold at the microstructure level. OBJECTIVE: In this study we present an effective method in validating the mechanical behaviour of designed scaffolds using a μCT with an in-situ mechanical deformation device. METHODS: The scaffolds were prepared from biodegradable poly(trimethylene carbonate) (PTMC) by stereolithography and images obtained using a high-resolution μCT with 12.25μm isometric voxels. The data was processed (filtering, segmentation) and analysed (surface generation, registration) to extract relevant deformation features. RESULTS: The computed local deformation fields, calculated at sub-pore resolutions, displayed expected linear behaviour within the scaffold along the compressions axis. On planes perpendicular to this axis, the deformations varied by 150– 200μm. CONCLUSIONS: μCT based imaging with in-situ deformation provides a vital tool in validating the design parameters of printed scaffolds. Deformation fields obtained from micro-tomographic image volumes can serve to corroborate the simulated ideal design with the realized product.
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Affiliation(s)
- Nathaniel Narra
- Department of Electronics and Communications Engineering, Tampere University of Technology, BioMediTech Tampere, Finland
| | - Sébastien B G Blanquer
- Department of Biomaterials Science and Technology, University of Twente, Enschede, The Netherlands
| | - Suvi P Haimi
- Department of Biomaterials Science and Technology, University of Twente, Enschede, The Netherlands
| | - Dirk W Grijpma
- Department of Biomaterials Science and Technology, University of Twente, Enschede, The Netherlands
| | - Jari Hyttinen
- Department of Electronics and Communications Engineering, Tampere University of Technology, BioMediTech Tampere, Finland
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Liu D, Li H, Jiang L, Chuan Y, Yuan M, Chen H. Characterization of Active Packaging Films Made from Poly(Lactic Acid)/ Poly(Trimethylene Carbonate) Incorporated with Oregano Essential Oil. Molecules 2016; 21:E695. [PMID: 27240336 DOI: 10.3390/molecules21060695] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Revised: 05/06/2016] [Accepted: 05/11/2016] [Indexed: 01/15/2023] Open
Abstract
Antimicromial and antioxidant bioactive films based on poly(lactic acid)/poly(trimenthylene carbonate) films incorporated with different concentrations of oregano essential oil (OEO) were prepared by solvent casting. The antimicrobial, antioxidant, physical, thermal, microstructural, and mechanical properties of the resulting films were examined. Scanning electron microscopy analysis revealed that the cross-section of films became rougher when OEO was incorporated into PLA/PTMC blends. Differential scanning calorimetry analysis indicated that crystallinity of PLA phase decreased by the addition of OEO, but this did not affect the thermal stability of the films. Water vapor permeability of films slightly increased with increasing concentration of OEO. However, active PLA/PTMC/OEO composite films showed adequate barrier properties for food packaging application. The antimicrobial and antioxidant capacities were significantly improved with the incorporation of OEO (p < 0.05). The results demonstrated that an optimal balance between the mechanical, barrier, thermal, antioxidant, and antimicrobial properties of the films was achieved by the incorporation of 9 wt % OEO into PLA/PTMC blends.
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16
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Yang L, Li J, Li M, Gu Z. The in Vitro and in Vivo Degradation of Cross-Linked Poly(trimethylene carbonate)-Based Networks. Polymers (Basel) 2016; 8:E151. [PMID: 30979246 DOI: 10.3390/polym8040151] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Revised: 04/09/2016] [Accepted: 04/14/2016] [Indexed: 11/17/2022] Open
Abstract
The degradation of the poly(trimethylene carbonate) (PTMC) and poly(trimethylene carbonate-co-ε-caprolactone) (P(TMC-co-CL)) networks cross-linked by 0.01 and 0.02 mol % 2,2'-bis(trimethylene carbonate-5-yl)-butylether (BTB) was carried out in the conditions of hydrolysis and enzymes in vitro and subcutaneous implantation in vivo. The results showed that the cross-linked PTMC networks exhibited much faster degradation in enzymatic conditions in vitro and in vivo versus in a hydrolysis case due to the catalyst effect of enzymes; the weight loss and physical properties of the degraded networks were dependent on the BTB amount. The morphology observation in lipase and in vivo illustrated that enzymes played an important role in the surface erosion of cross-linked PTMC. The hydrolytic degradation rate of the cross-linked P(TMC-co-CL) networks increased with increasing ε-caprolactone (CL) content in composition due to the preferential cleavage of ester bonds. Cross-linking is an effective strategy to lower the degradation rate and enhance the form-stability of PTMC-based materials.
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17
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Wach RA, Adamus A, Kowalska-Ludwicka K, Grobelski B, Cala J, Rosiak JM, Pasieka Z. In vivo evaluation of nerve guidance channels of PTMC/PLLA porous biomaterial. Arch Med Sci 2015; 11:210-9. [PMID: 25861309 PMCID: PMC4379356 DOI: 10.5114/aoms.2013.34732] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2012] [Revised: 11/06/2012] [Accepted: 12/26/2012] [Indexed: 01/03/2023] Open
Abstract
INTRODUCTION Peripheral nerve disruptions, frequently occurring during limb injuries, give rise to serious complications of patients recovery resulting from limitations in neural tissue regeneration capabilities. To overcome this problem bridging techniques utilizing guidance channels gain their importance. Biodegradable polymeric tubes seem to be more prospective then non-degradable materials - no necessity of implant removal and possibilities of release of incorporated drugs or biologically active agents that may support nerve regeneration process are the main advantages. MATERIAL AND METHODS Polymer blend of commercial poly(L-lactic acid) (PLLA) and in-house synthesized poly(trimethylene carbonate) (PTMC) were processed in an organic solvent - phase inversion process on a supporting rod - to form a guidance porous tube of 1.1 mm inner diameter. In vivo experiments on rat's cut femoral nerve by using either the tubes or end-to-end suturing (control group) involved 22 and 19 rats, respectively. Motor recovery of operated limbs, neuroma occurrence and histopathology of explanted nerves were evaluated after 30, 60 and 90 days of implantation. RESULTS Motor recovery of the limbs was of similar rate for the two animal groups. The neuroma formation was evident in over 90% control specimens, while for the bridging group it was less than 40% of all evaluable samples (p = 0.0022). Biocompatibility of applied materials was affirmed by moderate tissue response. CONCLUSIONS Application of the biodegradable PLLA/PTMC polymeric tubes effectively supports regeneration of discontinued nerves. The applied material prevents neuroma formation, by reducing the scar tissue formation time and, thus, accelerating the process of neural tissue restoration.
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Affiliation(s)
- Radoslaw A. Wach
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Technical University of Lodz, Lodz, Poland
| | - Agnieszka Adamus
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Technical University of Lodz, Lodz, Poland
| | | | | | - Jaroslaw Cala
- Department of Experimental Surgery, Medical University of Lodz, Lodz, Poland
| | - Janusz M. Rosiak
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Technical University of Lodz, Lodz, Poland
| | - Zbigniew Pasieka
- Department of Experimental Surgery, Medical University of Lodz, Lodz, Poland
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Schüller-Ravoo S, Zant E, Feijen J, Grijpma DW. Preparation of a designed poly(trimethylene carbonate) microvascular network by stereolithography. Adv Healthc Mater 2014; 3:2004-11. [PMID: 25319598 DOI: 10.1002/adhm.201400363] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Revised: 09/12/2014] [Indexed: 01/19/2023]
Abstract
Designed flexible and elastic network structures are prepared by stereolithography using a photo-crosslinkable resin based on a poly(trimethylene carbonate) (PTMC) macromer with a molecular weight of 3150 g/mol. Physical properties and the compatibility with human umbilical vein endothelial cells (HUVECs) are evaluated. The hydrophobic networks are found to be flexible and elastic, with an E modulus of 7.9 ± 0.1 MPa, a tensile strength of 3.5 ± 0.1 MPa and an elongation at break of 76.7 ± 0.7%. HUVECs attach and proliferate well on the surfaces of the built structures. A three-dimensional microvascular network is designed to serve as a perfusable scaffold for tissue engineering. In the design, 5 generations of open channels each branch into 4 smaller channels yielding a microvascular region with a high density of capillaries. The overall cross-sectional area through which medium or blood can be perfused remains constant. These structures would ensure efficient nourishment of cells in a large volume of tissue. Built by stereolithography using the PTMC resin, the smallest channels of these structures have square cross-sectional areas, with inner widths of approximately 224 μm and wall thicknesses of approximately 152 μm. The channels are open, allowing water to perfuse the scaffold at 0.279 ± 0.006 mL/s at 80 mmHg and 0.335 ± 0.009 mL/s at 120 mmHg.
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Affiliation(s)
- Sigrid Schüller-Ravoo
- Department of Polymer Chemistry and Biomaterials; Institute for Biomedical Technology and Technical Medicine (MIRA); University of Twente; P.O. Box 217 7500 AE Enschede The Netherlands
- Department of Biomaterials Science and Technology; Institute for Biomedical Technology and Technical Medicine (MIRA); University of Twente; P.O. Box 217 7500 AE Enschede The Netherlands
| | - Erwin Zant
- Department of Biomaterials Science and Technology; Institute for Biomedical Technology and Technical Medicine (MIRA); University of Twente; P.O. Box 217 7500 AE Enschede The Netherlands
| | - Jan Feijen
- Department of Polymer Chemistry and Biomaterials; Institute for Biomedical Technology and Technical Medicine (MIRA); University of Twente; P.O. Box 217 7500 AE Enschede The Netherlands
| | - Dirk W. Grijpma
- Department of Biomaterials Science and Technology; Institute for Biomedical Technology and Technical Medicine (MIRA); University of Twente; P.O. Box 217 7500 AE Enschede The Netherlands
- Department of Biomedical Engineering; University Medical Centre Groningen; University of Groningen; P.O. Box 196 9700 AD Groningen The Netherlands
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