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Ibrahim DM, Fomina A, Bouten CVC, Smits AIPM. Functional regeneration at the blood-biomaterial interface. Adv Drug Deliv Rev 2023; 201:115085. [PMID: 37690484 DOI: 10.1016/j.addr.2023.115085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 06/01/2023] [Accepted: 09/07/2023] [Indexed: 09/12/2023]
Abstract
The use of cardiovascular implants is commonplace in clinical practice. However, reproducing the key bioactive and adaptive properties of native cardiovascular tissues with an artificial replacement is highly challenging. Exciting new treatment strategies are under development to regenerate (parts of) cardiovascular tissues directly in situ using immunomodulatory biomaterials. Direct exposure to the bloodstream and hemodynamic loads is a particular challenge, given the risk of thrombosis and adverse remodeling that it brings. However, the blood is also a source of (immune) cells and proteins that dominantly contribute to functional tissue regeneration. This review explores the potential of the blood as a source for the complete or partial in situ regeneration of cardiovascular tissues, with a particular focus on the endothelium, being the natural blood-tissue barrier. We pinpoint the current scientific challenges to enable rational engineering and testing of blood-contacting implants to leverage the regenerative potential of the blood.
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Affiliation(s)
- Dina M Ibrahim
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands; Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, the Netherlands.
| | - Aleksandra Fomina
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands; Graduate School of Life Sciences, Utrecht University, Utrecht, the Netherlands.
| | - Carlijn V C Bouten
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands; Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, the Netherlands.
| | - Anthal I P M Smits
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands; Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, the Netherlands.
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2
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Overview of antimicrobial polyurethane-based nanocomposite materials and associated signalling pathways. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111087] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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3
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Matsushita H, Hayashi H, Nurminsky K, Dunn T, He Y, Pitaktong I, Koda Y, Xu S, Nguyen V, Inoue T, Rodgers D, Nelson K, Johnson J, Hibino N. Novel reinforcement of corrugated nanofiber tissue-engineered vascular graft to prevent aneurysm formation for arteriovenous shunts in an ovine model. JVS Vasc Sci 2022; 3:182-191. [PMID: 35495567 PMCID: PMC9044007 DOI: 10.1016/j.jvssci.2022.01.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Accepted: 01/25/2022] [Indexed: 11/24/2022] Open
Abstract
Objective Many patients who require hemodialysis treatment will often require a prosthetic graft after multiple surgeries. However, the patency rate of grafts currently available commercially has not been satisfactory. Tissue engineering vascular grafts (TEVGs) are biodegradable scaffolds created to promote autologous cell proliferation and functional neotissue regeneration and, accordingly, have antithrombogenicity. Therefore, TEVGs can be an alternative prosthesis for small diameter grafts. However, owing to the limitations of the graft materials, most TEVGs are rigid and can easily kink when implanted in limited spaces, precluding future clinical application. Previously, we developed a novel corrugated nanofiber graft to prevent graft kinking. Reinforcement of these grafts to ensure their safety is required in a preclinical study. In the present study, three types of reinforcement were applied, and their effectiveness was examined using large animals. Methods In the present study, three different reinforcements for the graft composed of corrugated poly-ε-caprolactone (PCL) blended with poly(L-lactide-co-ε-caprolactone) (PLCL) created with electrospinning were evaluated: 1) a polydioxanone suture, 2) a 2-0 polypropylene suture, 3) a polyethylene terephthalate/polyurethane (PET/PU) outer layer, and PCL/PLCL as the control. These different grafts were then implanted in a U-shape between the carotid artery and jugular vein in seven ovine models for a total of 14 grafts during a 3-month period. In evaluating the different reinforcements, the main factors considered were cell proliferation and a lack of graft dilation, which were evaluated using ultrasound examinations and histologic and mechanical analysis. Results No kinking of the grafts occurred. Overall, re-endothelialization was observed in all the grafts at 3 months after surgery without graft rupture or calcification. The PCL/PLCL grafts and PCL/PLCL grafts with a polydioxanone suture showed high cell infiltration; however, they had become dilated 10 weeks after surgery. In contrast, the PCL/PLCL graft with the 2-0 suture and the PCL/PLCL graft covered with a PET/PU layer did not show any graft expansion. The PCL/PLCL graft covered with a PET/PU layer showed less cell infiltration than that of the PCL/PLCL graft. Conclusions Reinforcement is required to create grafts that can withstand arterial pressure. Reinforcement with suture materials has the potential to maintain cell infiltration into the graft, which could improve the neotissue formation of the graft. In our basic science research study, we investigated tissue engineered vascular grafts for arteriovenous shunts. Our grafts were created with poly-ε-caprolactone and poly(L-lactide-co-ε-caprolactone) and designed with corrugated walls to avoid graft kinking. The grafts were implanted between the carotid artery and external jugular vein in a U-shape using an ovine model. To withstand the high pressure of blood on the arterial system, two types of reinforcement were applied to these tissue engineering vascular grafts. Because reinforcement of the graft could interfere with cell infiltration into the tissue engineering vascular grafts, the methods and material of reinforcement were investigated, in addition to the mechanical properties of the graft.
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Devillard CD, Marquette CA. Vascular Tissue Engineering: Challenges and Requirements for an Ideal Large Scale Blood Vessel. Front Bioeng Biotechnol 2021; 9:721843. [PMID: 34671597 PMCID: PMC8522984 DOI: 10.3389/fbioe.2021.721843] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 09/20/2021] [Indexed: 01/05/2023] Open
Abstract
Since the emergence of regenerative medicine and tissue engineering more than half a century ago, one obstacle has persisted: the in vitro creation of large-scale vascular tissue (>1 cm3) to meet the clinical needs of viable tissue grafts but also for biological research applications. Considerable advancements in biofabrication have been made since Weinberg and Bell, in 1986, created the first blood vessel from collagen, endothelial cells, smooth muscle cells and fibroblasts. The synergistic combination of advances in fabrication methods, availability of cell source, biomaterials formulation and vascular tissue development, promises new strategies for the creation of autologous blood vessels, recapitulating biological functions, structural functions, but also the mechanical functions of a native blood vessel. In this review, the main technological advancements in bio-fabrication are discussed with a particular highlights on 3D bioprinting technologies. The choice of the main biomaterials and cell sources, the use of dynamic maturation systems such as bioreactors and the associated clinical trials will be detailed. The remaining challenges in this complex engineering field will finally be discussed.
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Affiliation(s)
- Chloé D Devillard
- 3d.FAB, CNRS, INSA, Univ Lyon, CPE-Lyon, UMR5246, ICBMS, Université Lyon 1, Villeurbanne Cedex, France
| | - Christophe A Marquette
- 3d.FAB, CNRS, INSA, Univ Lyon, CPE-Lyon, UMR5246, ICBMS, Université Lyon 1, Villeurbanne Cedex, France
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Ye L, Takagi T, Tu C, Hagiwara A, Geng X, Feng Z. The performance of heparin modified poly(ε-caprolactone) small diameter tissue engineering vascular graft in canine-A long-term pilot experiment in vivo. J Biomed Mater Res A 2021; 109:2493-2505. [PMID: 34096176 DOI: 10.1002/jbm.a.37243] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 05/12/2021] [Accepted: 05/28/2021] [Indexed: 01/22/2023]
Abstract
Long-term in vivo observation in large animal model is critical for evaluating the potential of small diameter tissue engineering vascular graft (SDTEVG) in clinical application, but is rarely reported. In this study, a SDTEVG is fabricated by the electrospinning of poly(ε-caprolactone) and subsequent heparin modification. SDTEVG is implanted into canine's abdominal aorta for 511 days in order to investigate its clinical feasibility. An active and robust remodeling process was characterized by a confluent endothelium, macrophage infiltrate, extracellular matrix deposition and remodeling on the explanted graft. The immunohistochemical and immunofluorescence analysis further exhibit the regeneration of endothelium and smooth muscle layer on tunica intima and tunica media, respectively. Thus, long-term follow-up reveals viable neovessel formation beyond graft degradation. Furthermore, the von Kossa staining exhibits no occurrence of calcification. However, although no TEVG failure or rupture happens during the follow-up, the aneurysm is found by both Doppler ultrasonic and gross observation. Consequently, as-prepared TEVG shows promising potential in vascular tissue engineering if it can be appropriately strengthened to prevent the occurrence of aneurysm.
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Affiliation(s)
- Lin Ye
- School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, China.,Department of Medical Life System, Doshisha University, Kyoto, Japan
| | - Toshitaka Takagi
- Department of Medical Life System, Doshisha University, Kyoto, Japan
| | - Chengzhao Tu
- School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, China
| | - Akeo Hagiwara
- Department of Medical Life System, Doshisha University, Kyoto, Japan
| | - Xue Geng
- School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, China.,Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, Beijing, China
| | - Zengguo Feng
- School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, China.,Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, Beijing, China
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6
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The Biomimetic Evolution of Composite Materials: From Straw Bricks to Engineering Structures and Nanocomposites. JOURNAL OF COMPOSITES SCIENCE 2021. [DOI: 10.3390/jcs5050123] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Advanced polymer-based composite materials have revolutionized the structural material arena since their appearance some 60 years ago. Yet, despite their relatively short existence, they seem to be taken for granted as if they have always been there. One of the reasons for this state of affairs is that composite materials of various types have accompanied human history for thousands years, and their emergence in the modern era could be considered a natural evolutionary process. Nevertheless, the continuous line that leads from early days of composites in human history to current structural materials has exhibited a number of notable steps, each generating an abrupt advance toward the contemporary new science of composite materials. In this paper, I review and discuss the history of composites with emphasis on the main steps of their development.
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Sohn SH, Kim TH, Kim TS, Min TJ, Lee JH, Yoo SM, Kim JW, Lee JE, Kim CH, Park SH, Jo WM. Evaluation of 3D Templated Synthetic Vascular Graft Compared with Standard Graft in a Rat Model: Potential Use as an Artificial Vascular Graft in Cardiovascular Disease. MATERIALS 2021; 14:ma14051239. [PMID: 33807950 PMCID: PMC7962035 DOI: 10.3390/ma14051239] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 02/25/2021] [Accepted: 03/01/2021] [Indexed: 12/03/2022]
Abstract
Although the number of vascular surgeries using vascular grafts is increasing, they are limited by vascular graft-related complications and size discrepancy. Current efforts to develop the ideal synthetic vascular graft for clinical application using tissue engineering or 3D printing are far from satisfactory. Therefore, we aimed to re-design the vascular graft with modified materials and 3D printing techniques and also demonstrated the improved applications of our new vascular graft clinically. We designed the 3D printed polyvinyl alcohol (PVA) templates according to the vessel size and shape, and these were dip-coated with salt-suspended thermoplastic polyurethane (TPU). Next, the core template was removed to obtain a customized porous TPU graft. The mechanical testing and cytotoxicity studies of the new synthetic 3D templated vascular grafts (3DT) were more appropriate compared with commercially available polytetrafluoroethylene (PTFE) grafts (ePTFE; standard graft, SG) for clinical use. Finally, we performed implantation of the 3DTs and SGs into the rat abdominal aorta as a patch technique. Four groups of the animal model (SG_7 days, SG_30 days, 3DT_7 days, and 3DT_30 days) were enrolled in this study. The abdominal aorta was surgically opened and sutured with SG or 3DT with 8/0 Prolene. The degree of endothelial cell activation, neovascularization, thrombus formation, calcification, inflammatory infiltrates, and fibrosis were analyzed histopathologically. There was significantly decreased thrombogenesis in the group treated with the 3DT for 30 days compared with the group treated with the SG for 7 and 30 days, and the 3DT for 7 days. In addition, the group treated with the 3DT for 30 days may also have shown increased postoperative endothelialization in the early stages. In conclusion, this study suggests the possibility of using the 3DT as an SG substitute in vascular surgery.
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Affiliation(s)
- Sung-Hwa Sohn
- Department of Thoracic & Cardiovascular Surgery, Korea University Ansan Hospital, Korea University College of Medicine, Ansan 15355, Korea; (S.-H.S.); (T.-S.K.); (S.-M.Y.)
| | - Tae-Hee Kim
- Advanced Textile R&D Department, Korea Institute of Industrial Technology, Ansan 15588, Korea; (T.-H.K.); (J.-E.L.); (C.-H.K.)
| | - Tae-Sik Kim
- Department of Thoracic & Cardiovascular Surgery, Korea University Ansan Hospital, Korea University College of Medicine, Ansan 15355, Korea; (S.-H.S.); (T.-S.K.); (S.-M.Y.)
| | - Too-Jae Min
- Department of Anesthesiology and Pain Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan 15355, Korea; (T.-J.M.); (J.-W.K.)
| | - Ju-Han Lee
- Department of Pathology, Korea University Ansan Hospital, Korea University College of Medicine, Ansan 15355, Korea;
| | - Sung-Mook Yoo
- Department of Thoracic & Cardiovascular Surgery, Korea University Ansan Hospital, Korea University College of Medicine, Ansan 15355, Korea; (S.-H.S.); (T.-S.K.); (S.-M.Y.)
| | - Ji-Won Kim
- Department of Anesthesiology and Pain Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan 15355, Korea; (T.-J.M.); (J.-W.K.)
| | - Ji-Eun Lee
- Advanced Textile R&D Department, Korea Institute of Industrial Technology, Ansan 15588, Korea; (T.-H.K.); (J.-E.L.); (C.-H.K.)
| | - Chae-Hwa Kim
- Advanced Textile R&D Department, Korea Institute of Industrial Technology, Ansan 15588, Korea; (T.-H.K.); (J.-E.L.); (C.-H.K.)
| | - Suk-Hee Park
- School of Mechanical Engineering, Pusan National University, 2 Busandaehak-ro, 63 Beon-gil, Geumjeong-gu, Busan 46241, Korea
- Correspondence: (S.-H.P.); (W.-M.J.)
| | - Won-Min Jo
- Department of Thoracic & Cardiovascular Surgery, Korea University Ansan Hospital, Korea University College of Medicine, Ansan 15355, Korea; (S.-H.S.); (T.-S.K.); (S.-M.Y.)
- Correspondence: (S.-H.P.); (W.-M.J.)
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Mandal M, Ramkumar V, Chakraborty D. Salen complexes of zirconium and hafnium: synthesis, structural characterization and polymerization studies. Polym Chem 2019. [DOI: 10.1039/c8py01750f] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Salen complexes of zirconium and hafnium were synthesized and used as effective catalysts for the polymerization of lactide and ε-CL and homopolymerization, copolymerization and coupling of epoxides with CO2.
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Affiliation(s)
- Mrinmay Mandal
- Department of Chemistry
- Indian Institute of Technology Patna
- Bihta 801103
- India
| | | | - Debashis Chakraborty
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai-600 036
- India
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9
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Stern T. Conclusive chemical deciphering of the consistently occurring double-peak carbonyl-stretching FTIR absorbance in polyurethanes. POLYM ADVAN TECHNOL 2018. [DOI: 10.1002/pat.4503] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Theodor Stern
- Department of Chemical Engineering, Biotechnology and Materials, Faculty of Engineering; Ariel University; Ariel Israel
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10
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Liu RH, Ong CS, Fukunishi T, Ong K, Hibino N. Review of Vascular Graft Studies in Large Animal Models. TISSUE ENGINEERING PART B-REVIEWS 2017; 24:133-143. [PMID: 28978267 DOI: 10.1089/ten.teb.2017.0350] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
As the incidence of cardiovascular disease continues to climb worldwide, there is a corresponding increase in demand for surgical interventions involving vascular grafts. The current gold standard for vascular grafts is autologous vessels, an option often excluded due to disease circumstances. As a result, many patients must resort to prosthetic options. While widely available, prosthetic grafts have been demonstrated to have inferior patency rates compared with autologous grafts due to inflammation and thrombosis. In an attempt to overcome these limitations, many different materials for constructing vascular grafts, from modified synthetic nondegradable polymers to biodegradable polymers, have been explored, many of which have entered the translational stage of research. This article reviews these materials in the context of large animal models, providing an outlook on the preclinical potential of novel biomaterials as well as the future direction of vascular graft research.
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Affiliation(s)
- Rui Han Liu
- 1 Division of Cardiac Surgery, The Johns Hopkins Hospital , Baltimore, Maryland
| | - Chin Siang Ong
- 1 Division of Cardiac Surgery, The Johns Hopkins Hospital , Baltimore, Maryland
| | - Takuma Fukunishi
- 1 Division of Cardiac Surgery, The Johns Hopkins Hospital , Baltimore, Maryland
| | - Kingsfield Ong
- 2 Department of Cardiac, Thoracic and Vascular Surgery, National University Health System , Singapore, Singapore
| | - Narutoshi Hibino
- 1 Division of Cardiac Surgery, The Johns Hopkins Hospital , Baltimore, Maryland
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11
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Stern T. Hierarchical fractal-structured allophanate-derived network formation in bulk polyurethane synthesis. POLYM ADVAN TECHNOL 2017. [DOI: 10.1002/pat.4180] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Theodor Stern
- Department of Chemical Engineering, Biotechnology and Materials, Faculty of Engineering; Ariel University; Ariel Israel
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12
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Alexandre N, Amorim I, Caseiro AR, Pereira T, Alvites R, Rêma A, Gonçalves A, Valadares G, Costa E, Santos-Silva A, Rodrigues M, Lopes MA, Almeida A, Santos JD, Maurício AC, Luís AL. Long term performance evaluation of small-diameter vascular grafts based on polyvinyl alcohol hydrogel and dextran and MSCs-based therapies using the ovine pre-clinical animal model. Int J Pharm 2017; 523:515-530. [PMID: 28283218 DOI: 10.1016/j.ijpharm.2017.02.043] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The functional and structural performance of a 5cm synthetic small diameter vascular graft (SDVG) produced by the copolymerization of polyvinyl alcohol hydrogel with low molecular weight dextran (PVA/Dx graft) associated to mesenchymal stem cells (MSCs)-based therapies and anticoagulant treatment with heparin, clopidogrel and warfarin was tested using the ovine model during the healing period of 24 weeks. The results were compared to the ones obtained with standard expanded polyetetrafluoroethylene grafts (ePTFE graft). Blood flow, vessel and graft diameter measurements, graft appearance and patency rate (PR), thrombus, stenosis and collateral vessel formation were evaluated by B-mode ultrasound, audio and color flow Doppler. Graft and regenerated vessels morphologic evaluation was performed by scanning electronic microscopy (SEM), histopathological and immunohistochemical analysis. All PVA/Dx grafts could maintain a similar or higher PR and systolic/diastolic laminar blood flow velocities were similar to ePTFE grafts. CD14 (macrophages) and α-actin (smooth muscle) staining presented similar results in PVA/Dx/MSCs and ePTFE graft groups. Fibrosis layer was lower and endothelial cells were only detected at graft-artery transitions where it was added the MSCs. In conclusion, PVA/Dx graft can be an excellent scaffold candidate for vascular reconstruction, including clinic mechanically challenging applications, such as SDVGs, especially when associated to MSCs-based therapies to promote higher endothelialization and lower fibrosis of the vascular prosthesis, but also higher PR values.
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Affiliation(s)
- Nuno Alexandre
- Departamento de Zootecnia, Universidade de Évora, Pólo da Mitra, Apartado 94, 7002-554 Évora, Portugal; Instituto de Ciências Agroambientais Mediterrânicas (ICAAM), Pólo da Mitra, Apartado 94, 7002-554 Évora, Portugal
| | - Irina Amorim
- Departamento de Patologia e de Imunologia Molecular, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Rua de Jorge Viterbo Ferreira, n° 228, 4050-313 Porto, Portugal; Instituto de Investigação e Inovação em Saúde (i3S), Universidade do Porto (UP), Rua Alfredo Allen, 4200-135 Porto, Portugal
| | - Ana Rita Caseiro
- Centro de Estudos de Ciência Animal (CECA), Instituto de Ciências, Tecnologias e Agroambiente da Universidade do Porto (ICETA), Praça Gomes Teixeira, Apartado 55142, 4051-401 Porto, Portugal; Departamento de Clínicas Veterinárias, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Rua de Jorge Viterbo Ferreira, n° 228, 4050-313 Porto, Portugal; CEMUC, Departamento de Engenharia Metalúrgica e Materiais, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
| | - Tiago Pereira
- Centro de Estudos de Ciência Animal (CECA), Instituto de Ciências, Tecnologias e Agroambiente da Universidade do Porto (ICETA), Praça Gomes Teixeira, Apartado 55142, 4051-401 Porto, Portugal; Departamento de Clínicas Veterinárias, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Rua de Jorge Viterbo Ferreira, n° 228, 4050-313 Porto, Portugal
| | - Rui Alvites
- Centro de Estudos de Ciência Animal (CECA), Instituto de Ciências, Tecnologias e Agroambiente da Universidade do Porto (ICETA), Praça Gomes Teixeira, Apartado 55142, 4051-401 Porto, Portugal; Departamento de Clínicas Veterinárias, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Rua de Jorge Viterbo Ferreira, n° 228, 4050-313 Porto, Portugal
| | - Alexandra Rêma
- Departamento de Patologia e de Imunologia Molecular, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Rua de Jorge Viterbo Ferreira, n° 228, 4050-313 Porto, Portugal
| | - Ana Gonçalves
- Departamento de Patologia e de Imunologia Molecular, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Rua de Jorge Viterbo Ferreira, n° 228, 4050-313 Porto, Portugal
| | - Guilherme Valadares
- Internvet, Rua Academia Recreativa Santo Amaro, n° 13, 1300-001 Lisboa, Portugal
| | - Elísio Costa
- Laboratório de Bioquímica, Departamento de Ciências Biológicas, Faculdade de Farmácia, Universidade do Porto (UP), Rua de Jorge Viterbo Ferreira, n° 228, 4050-313 Porto, Portugal; Instituto de Biologia Molecular e Celular (IBMC), Universidade do Porto (UP), Rua do Campo Alegre, N°. 823, 4150 Porto, Portugal
| | - Alice Santos-Silva
- Laboratório de Bioquímica, Departamento de Ciências Biológicas, Faculdade de Farmácia, Universidade do Porto (UP), Rua de Jorge Viterbo Ferreira, n° 228, 4050-313 Porto, Portugal; Instituto de Biologia Molecular e Celular (IBMC), Universidade do Porto (UP), Rua do Campo Alegre, N°. 823, 4150 Porto, Portugal
| | - Miguel Rodrigues
- CEMUC, Departamento de Engenharia Metalúrgica e Materiais, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
| | - Maria Ascensão Lopes
- CEMUC, Departamento de Engenharia Metalúrgica e Materiais, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
| | - André Almeida
- Centro de Estudos de Ciência Animal (CECA), Instituto de Ciências, Tecnologias e Agroambiente da Universidade do Porto (ICETA), Praça Gomes Teixeira, Apartado 55142, 4051-401 Porto, Portugal
| | - José Domingos Santos
- CEMUC, Departamento de Engenharia Metalúrgica e Materiais, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
| | - Ana Colette Maurício
- Centro de Estudos de Ciência Animal (CECA), Instituto de Ciências, Tecnologias e Agroambiente da Universidade do Porto (ICETA), Praça Gomes Teixeira, Apartado 55142, 4051-401 Porto, Portugal; Departamento de Clínicas Veterinárias, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Rua de Jorge Viterbo Ferreira, n° 228, 4050-313 Porto, Portugal
| | - Ana Lúcia Luís
- Centro de Estudos de Ciência Animal (CECA), Instituto de Ciências, Tecnologias e Agroambiente da Universidade do Porto (ICETA), Praça Gomes Teixeira, Apartado 55142, 4051-401 Porto, Portugal; Departamento de Clínicas Veterinárias, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Rua de Jorge Viterbo Ferreira, n° 228, 4050-313 Porto, Portugal.
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Long term performance evaluation of small-diameter vascular grafts based on polyvinyl alcohol hydrogel and dextran and MSCs-based therapies using the ovine pre-clinical animal model. Int J Pharm 2016; 513:332-346. [DOI: 10.1016/j.ijpharm.2016.09.045] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 09/12/2016] [Accepted: 09/13/2016] [Indexed: 01/04/2023]
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14
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Compliance properties of collagen-coated polyethylene terephthalate vascular prostheses. J Appl Biomater Funct Mater 2014; 12:163-71. [PMID: 24756779 DOI: 10.5301/jabfm.5000189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/22/2013] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND Compliance mismatch between native artery and a prosthetic graft used for infrainguinal bypass is said to be a factor for graft failure. The aim of this study was to develop a technique for measuring the compliance of collagen-coated polyethylene terephthalate (PET) vascular prostheses and to analyze the influence of several key properties on the elastic behavior of the grafts. METHODS Compliance testing was performed on 3 prostheses with and without internal compliant membrane (ICM). The principle of this test was to study the dimensional changes of prostheses submitted to internal pressure from 30 to 240 mm Hg at intervals of predetermined values. RESULTS We demonstrated that the ICM created links with the inner surface of the crimps and considerably modified the graft behavior when submitted to internal pressure. The results showed that compliance properties were dependent on the wall thickness and the crimping geometry of textile vascular prostheses. Mechanical analysis predicts the circumferential tensile behavior of these arterial grafts and validates tests for measuring compliance.
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Selle HK, Bar-On B, Marom G, Wagner HD. Gelatin yarns inspired by tendons--structural and mechanical perspectives. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 47:1-7. [PMID: 25492166 DOI: 10.1016/j.msec.2014.11.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 10/26/2014] [Accepted: 11/01/2014] [Indexed: 10/24/2022]
Abstract
Tendons are among the most robust structures in nature. Using the structural properties of natural tendon as a foundation for the development of micro-yarns may lead to innovative composite materials. Gelatin monofilaments were prepared by casting and spinning and small yarns--with up to ten filaments--were assembled into either parallel or 15° twisted yarns. The latter were intended as an attempt to generate mechanical effects similar to those arising from the crimp pattern in tendon. The mechanical properties of parallel and 15° twisted gelatin yarns were compared. The effect of an increasing number of filaments per yarn was also examined. The mechanical properties were mostly affected by the increasing number of filaments, and no benefit arose from twisting small yarns by 15°. However, since gelatin filaments are elasto-plastic rather than fully elastic, much increased toughness (by up to a factor of five for a ten filament yarn) can be achieved with yarns made of elasto-plastic filaments, as demonstrated by experiments and numerical simulations. The resulting effect shows some resemblance to the effect of crimp in tendons. Finally, we developed a dependable procedure to measure the toughness of single filaments based on the test of a yarn rather than on a large number of individual filament tests.
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Affiliation(s)
- Hila Klein Selle
- Casali Center of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 91904, Israel; Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Benny Bar-On
- Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Gad Marom
- Casali Center of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 91904, Israel.
| | - H Daniel Wagner
- Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel.
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Kim HJ, Kang MS, Knowles JC, Gong MS. Synthesis of highly elastic biocompatible polyurethanes based on bio-based isosorbide and poly(tetramethylene glycol) and their properties. J Biomater Appl 2014; 29:454-64. [PMID: 24812276 PMCID: PMC4230967 DOI: 10.1177/0885328214533737] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Bio-based high elastic polyurethanes were prepared from hexamethylene diisocyanate and various ratios of isosorbide to poly(tetramethylene glycol) as a diol by a simple one-shot bulk polymerization without a catalyst. Successful synthesis of the polyurethanes was confirmed by Fourier transform-infrared spectroscopy and (1)H nuclear magnetic resonance. Thermal properties were determined by differential scanning calorimetry and thermogravimetric analysis. The glass transition temperature was -47.8℃. The test results showed that the poly(tetramethylene glycol)/isosorbide-based elastomer exhibited not only excellent stress-strain properties but also superior resilience to the existing polyether-based polyurethane elastomers. The static and dynamic properties of the polyether/isosorbide-based thermoplastic elastomer were more suitable for dynamic applications. Moreover, such rigid diols impart biocompatible and bioactive properties to thermoplastic polyurethane elastomers. Degradation tests performed at 37℃ in phosphate buffer solution showed a mass loss of 4-9% after 8 weeks, except for the polyurethane with the lowest isosorbide content, which showed an initial rapid weight loss. These polyurethanes offer significant promise due to soft, flexible and biocompatible properties for soft tissue augmentation and regeneration.
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Affiliation(s)
- Hyo-Jin Kim
- Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center, Dankook University Graduate School, Chungnam, South Korea
| | - Min-Sil Kang
- Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center, Dankook University Graduate School, Chungnam, South Korea
| | - Jonathan C Knowles
- Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center, Dankook University Graduate School, Chungnam, South Korea Division of Biomaterials and Tissue Engineering, UCL Eastman Dental Institute, University College London, London, UK
| | - Myoung-Seon Gong
- Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center, Dankook University Graduate School, Chungnam, South Korea
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17
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Lim DI, Park HS, Park JH, Knowles JC, Gong MS. Application of high-strength biodegradable polyurethanes containing different ratios of biobased isomannide and poly (ϵ-caprolactone) diol. J BIOACT COMPAT POL 2013; 28:274-288. [PMID: 25076809 PMCID: PMC4108296 DOI: 10.1177/0883911513484572] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Biodegradable–biocompatible polyurethanes were prepared with fixed hexamethylene
diisocyanate and varying ratios of isomannide and poly(ϵ-caprolactone) diol using a simple
one-step polymerization without a catalyst. The polyurethane structures were confirmed by
1H-nuclear magnetic resonance, Fourier transform infrared spectroscopy, and
gel permeation chromatography. The glass transition temperatures were determined by
thermal analysis to be between 25°C and 30°C. Degradation tests performed at 37°C in
phosphate buffer produced mass losses of 5%–10% after 8 weeks. After 5 days of culture,
using osteoblastic cells, the relative cell number on all the polyurethane films was only
slightly lower than that of an optimized tissue culture plastic. These polymers offer
significant promise with a simplistic synthesis and controlled degradation.
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Affiliation(s)
- Dong-In Lim
- Department of Nanobiomedical Science & WCU Research Center, Graduate School, Dankook University, Cheonan, South Korea
| | - Hyung-Seok Park
- Department of Nanobiomedical Science & WCU Research Center, Graduate School, Dankook University, Cheonan, South Korea
| | - Jeong-Hui Park
- Department of Nanobiomedical Science & WCU Research Center, Graduate School, Dankook University, Cheonan, South Korea
| | - Jonathan C Knowles
- Department of Nanobiomedical Science & WCU Research Center, Graduate School, Dankook University, Cheonan, South Korea ; Department of Biomaterials and Tissue Engineering, UCL Eastman Dental Institute, London, UK
| | - Myoung-Seon Gong
- Department of Nanobiomedical Science & WCU Research Center, Graduate School, Dankook University, Cheonan, South Korea
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Chan-Chan LH, Vargas-Coronado RF, Cervantes-Uc JM, Cauich-Rodríguez JV, Rath R, Phelps EA, García AJ, San Román Del Barrio J, Parra J, Merhi Y, Tabrizian M. Platelet adhesion and human umbilical vein endothelial cell cytocompatibility of biodegradable segmented polyurethanes prepared with 4,4'-methylene bis(cyclohexyl isocyanate), poly(caprolactone) diol and butanediol or dithioerythritol as chain extenders. J Biomater Appl 2012; 28:270-7. [PMID: 22684514 DOI: 10.1177/0885328212448259] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Biodegradable segmented polyurethanes were prepared with poly(caprolactone) diol as a soft segment, 4,4'-methylene bis(cyclohexyl isocyanate) (HMDI) and either butanediol or dithioerythritol as chain extenders. Platelet adhesion was similar in all segmented polyurethanes studied and not different from Tecoflex® although an early stage of activation was observed on biodegradable segmented polyurethane prepared with dithioerythritol. Relative viability was higher than 80% on human umbilical vein endothelial cells in contact with biodegradable segmented polyurethane extracts after 1, 2 and 7 days. Furthermore, both biodegradable segmented polyurethane materials supported human umbilical vein endothelial cell adhesion, spreading, and viability similar to Tecoflex® medical-grade polyurethane. These biodegradable segmented polyurethanes represent promising materials for cardiovascular applications.
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Affiliation(s)
- L H Chan-Chan
- Centro de Investigación Científica de Yucatán, A.C., Calle 43 # 130 Col. Chuburná de Hidalgo, Mérida, Yucatán, México
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20
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Jiao M, Yang K, Zhang W, Pan W, Zhang R, Xie S. Designing and Characterization of Biodegradable Multiblock Poly(L-Lactic Acid)/Polybutadiene Elastomers. J MACROMOL SCI B 2011. [DOI: 10.1080/00222348.2011.557612] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Mingli Jiao
- a School of Materials and Chemical Engineering, Zhongyuan University of Technology , Zhengzhou, P.R. China
| | - Kai Yang
- b School of Fashion, Zhongyuan University of Technology , Zhengzhou, P.R. China
| | - Wangxi Zhang
- a School of Materials and Chemical Engineering, Zhongyuan University of Technology , Zhengzhou, P.R. China
| | - Wei Pan
- a School of Materials and Chemical Engineering, Zhongyuan University of Technology , Zhengzhou, P.R. China
| | - Ruiwen Zhang
- a School of Materials and Chemical Engineering, Zhongyuan University of Technology , Zhengzhou, P.R. China
| | - Si Xie
- c College of Material Science and Engineering, Doughua University , Shanghai, P.R. China
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21
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Manju S, Muraleedharan CV, Rajeev A, Jayakrishnan A, Joseph R. Evaluation of alginate dialdehyde cross-linked gelatin hydrogel as a biodegradable sealant for polyester vascular graft. J Biomed Mater Res B Appl Biomater 2011; 98:139-49. [DOI: 10.1002/jbm.b.31843] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Revised: 01/13/2011] [Accepted: 02/10/2011] [Indexed: 11/11/2022]
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22
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McClure M, Wolfe P, Rodriguez I, Bowlin G. Bioengineered vascular grafts: improving vascular tissue engineering through scaffold design. J Drug Deliv Sci Technol 2011. [DOI: 10.1016/s1773-2247(11)50030-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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23
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Abstract
Cardiovascular disease is the leading cause of mortality in the USA. The limited availability of healthy autologous vessels for bypass grafting procedures has led to the fabrication of prosthetic vascular conduits. While synthetic polymers have been extensively studied as substitutes in vascular engineering, they fall short of meeting the biological challenges at the blood-material interface. Various tissue engineering strategies have emerged to address these flaws and increase long-term patency of vascular grafts. Vascular cell seeding of scaffolds and the design of bioactive polymers for in situ arterial regeneration have yielded promising results. This article describes the advances made in biomaterials design to generate suitable materials that not only match the mechanical properties of native vasculature, but also promote cell growth, facilitate extracellular matrix production and inhibit thrombogenicity.
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Affiliation(s)
- Swathi Ravi
- Department of Surgery, Emory University, Atlanta, GA 30332, USA
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24
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Byrom MJ, Bannon PG, White GH, Ng MKC. Animal models for the assessment of novel vascular conduits. J Vasc Surg 2010; 52:176-95. [PMID: 20299181 DOI: 10.1016/j.jvs.2009.10.080] [Citation(s) in RCA: 130] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2010] [Revised: 09/25/2009] [Accepted: 10/04/2010] [Indexed: 11/19/2022]
Abstract
The development of an ideal small-diameter conduit for use in vascular bypass surgery has yet to be achieved. The ongoing innovation in biomaterial design generates novel conduits that require preclinical assessment in vivo, and a number of animal models have been used for this purpose. This article examines the rationale behind animal models used in the assessment of small-diameter vascular conduits encompassing the commonly used species: baboons, sheep, pigs, dogs, rabbits, and rodents. Studies on the comparative hematology for these species relative to humans are summarized, and the hydrodynamic values for common implant locations are also compared. The large- and small-animal models are then explored, highlighting the characteristics of each that determine their relative utility in the assessment of vascular conduits. Where possible, the performance of expanded polytetrafluoroethylene is given in each animal and in each location to allow direct comparisons between species. New challenges in animal modeling are outlined for the assessment of tissue-engineered graft designs. Finally, recommendations are given for the selection of animal models for the assessment of future vascular conduits.
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Soldani G, Losi P, Bernabei M, Burchielli S, Chiappino D, Kull S, Briganti E, Spiller D. Long term performance of small-diameter vascular grafts made of a poly(ether)urethane–polydimethylsiloxane semi-interpenetrating polymeric network. Biomaterials 2010; 31:2592-605. [DOI: 10.1016/j.biomaterials.2009.12.017] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2009] [Accepted: 12/07/2009] [Indexed: 10/20/2022]
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26
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Katiyar V, Nanavati H. Ring-opening polymerization of L-lactide using N-heterocyclic molecules: mechanistic, kinetics and DFT studies. Polym Chem 2010. [DOI: 10.1039/c0py00125b] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
Cardiovascular disease is the leading cause of mortality in the United States. The limited availability of healthy autologous vessels for bypass grafting procedures has led to the fabrication of prosthetic vascular conduits. Synthetic polymeric materials, while providing the appropriate mechanical strength, lack the compliance and biocompatibility that bioresorbable and naturally occurring protein polymers offer. Vascular tissue engineering approaches have emerged in order to meet the challenges of designing a vascular graft with long-term patency. In vitro culture techniques that have been explored with vascular cell seeding of polymeric scaffolds and the use of bioactive polymers for in situ arterial regeneration have yielded promising results. This review describes the development of polymeric materials in various tissue engineering strategies for the improvement in the mechanical and biological performance of an arterial substitute.
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Affiliation(s)
- Swathi Ravi
- Department of Surgery, Emory University, Atlanta, GA
- Biomedical Engineering, Emory University/Georgia Institute of Technology, Atlanta, GA
| | - Zheng Qu
- Department of Surgery, Emory University, Atlanta, GA
- Biomedical Engineering, Emory University/Georgia Institute of Technology, Atlanta, GA
| | - Elliot L. Chaikof
- Department of Surgery, Emory University, Atlanta, GA
- Biomedical Engineering, Emory University/Georgia Institute of Technology, Atlanta, GA
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA
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28
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The behavior of endothelial cells on polyurethane nanocomposites and the associated signaling pathways. Biomaterials 2009; 30:1502-11. [PMID: 19118895 DOI: 10.1016/j.biomaterials.2008.12.003] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2008] [Accepted: 12/01/2008] [Indexed: 11/23/2022]
Abstract
A series of nanocomposites from polyurethane (PU) incorporated with various low concentrations (17.4-174 ppm) of gold nanoparticles (approximately 5 nm) (denoted "PU-Au") were used as a model system to study the mechanisms that influenced endothelial cell (EC) migration on biomaterial surfaces. The migration rate of ECs on the PU-Au nanocomposites was determined by a real-time image system. It was found that ECs had the highest migration rate on the nanocomposite containing 43.5 ppm of gold ("PU-Au 43.5 ppm"). The high EC migration rate was associated with increased levels of endothelial nitric oxide synthase (eNOS) and phosphorylated-Akt (p-Akt) expressed by ECs cultured on PU-Au. The inductions of both eNOS and p-Akt on PU-Au were abolished by the addition of LY294002 (PI3K inhibitor), suggesting that these cellular events may be regulated through the PI3K signaling pathway. Using a biotinylated VEGF-165 that recognizes VEGF receptors and by FACS analysis, slightly higher expression of VEGF receptors for ECs on PU-Au was also demonstrated. Phalloidin staining showed that actin appeared as a circumferential band surrounding each cell on tissue culture polystyrene, whereas on PU-Au, especially on PU-Au 43.5 ppm, the cells had their margin spread out and extend processes with stress fibers in the protruding lamellipodia. Moreover, the higher EC migration rate on PU-Au 43.5 ppm was suppressed by LY294002. The higher protein expression of focal adhesion kinase (FAK) on PU-Au 43.5 ppm was observed in FAK-GFP transfected ECs. It was concluded that PU-Au nanocomposites activated FAK and the PI3K/Akt signaling pathway in ECs, leading to proliferation and migration of ECs on these surfaces.
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Silicone-Based Vascular Prosthesis: Assessment of the Mechanical Properties. Ann Vasc Surg 2008; 22:106-14. [DOI: 10.1016/j.avsg.2007.09.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2007] [Revised: 08/01/2007] [Accepted: 09/14/2007] [Indexed: 11/20/2022]
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Shimizu K, Ito A, Arinobe M, Murase Y, Iwata Y, Narita Y, Kagami H, Ueda M, Honda H. Effective cell-seeding technique using magnetite nanoparticles and magnetic force onto decellularized blood vessels for vascular tissue engineering. J Biosci Bioeng 2007; 103:472-8. [PMID: 17609164 DOI: 10.1263/jbb.103.472] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2007] [Accepted: 02/20/2007] [Indexed: 11/17/2022]
Abstract
Increasing attention has been given to vascular tissue engineering in recent years. Although cell seeding onto tubular scaffolds is the first step for constructing three-dimensional vascular grafts, the tubular geometry of the grafts hinders the efficient delivery of cells onto the scaffold. To overcome these limitations, we present here a novel cell-seeding technique using magnetic force and magnetite nanoparticles, termed Mag-seeding. NIH/3T3 fibroblasts (3T3s) were labeled magnetically using our original magnetite cationic liposomes (MCLs), which have a positive surface charge, to improve adsorption onto cell surface. In this study, porcine decellularized common carotid artery (dCCA) was used as one of the most promising scaffolds, because dCCA consists of a mixture of structural and functional proteins that constitute the extracellular matrix. When a cylindrical magnet was inserted into the lumen of dCCA and the dCCA was immersed into a suspension of magnetically labeled 3T3s, almost all the 3T3s attached onto the dCCA, whereas a low cell-seeding efficiency was achieved without using a magnet. When the magnetite uptake rate per cell increased, cell-seeding efficiency by Mag-seeding was enhanced. Furthermore, to construct a vascular graft for humans, the porcine dCCA, which was reseeded with two human cells (smooth muscle cells and dermal fibroblasts), was successfully constructed by Mag-seeding. These results indicate that Mag-seeding can be used for vascular tissue engineering.
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Affiliation(s)
- Kazunori Shimizu
- Department of Biotechnology, School of Engineering, Nagoya University, Nagoya, Aichi, Japan
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31
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KC RB, Bhattarai SR, Aryal S, Bhattarai N, Lee BM, Kim HY. Synthesis and characterization of amine-functionalized amphiphilic block copolymers based on poly(ethylene glycol) and poly(caprolactone). POLYM INT 2007. [DOI: 10.1002/pi.2160] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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32
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Gunatillake P, Mayadunne R, Adhikari R. Recent developments in biodegradable synthetic polymers. BIOTECHNOLOGY ANNUAL REVIEW 2006; 12:301-47. [PMID: 17045198 DOI: 10.1016/s1387-2656(06)12009-8] [Citation(s) in RCA: 181] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
This chapter reviews recent developments in biodegradable synthetic polymers focusing on tailoring polymer structures to meet material specification for emerging applications such as tissue engineered products and therapies. Major classes and new families of synthetic polymers are discussed with regard to synthesis, properties and biodegradability, and known degradation modes and products are summarized based on studies reported during the past 10-15 years. Polyesters and their copolymers, polyurethanes, polyphosphazenes, polyanhydrides, polycarbonates, polyesteramides and recently developed injectable polymer systems based on polypropylenefumarates, polyurethanes and acrylate/urethane systems are reviewed. Polyesters such as polyglycolides, polylactides and their copolymers still remain as the major class of synthetic biodegradable polymers with products in clinical use. Although various copolymerization methods have addressed needs of different applications, release of acidic degradation products, processing difficulties and limited range of mechanical properties remains as major disadvantages of this family of polymers. Injectable polymers based on urethane and urethane/acrylate have shown great promise in developing delivery systems for tissue engineered products and therapies.
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Affiliation(s)
- Pathiraja Gunatillake
- PolyNovo Biomaterials Pty Ltd, Bag 10, Clayton South, Bayview Avenue, Clayton 3169, Australia.
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Cohn D, Salomon AH. Designing biodegradable multiblock PCL/PLA thermoplastic elastomers. Biomaterials 2005; 26:2297-305. [PMID: 15585232 DOI: 10.1016/j.biomaterials.2004.07.052] [Citation(s) in RCA: 213] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2004] [Accepted: 07/23/2004] [Indexed: 11/27/2022]
Abstract
A series of poly(epsilon-caprolactone)/poly(L-lactic acid) (PCL/PLA) biodegradable poly(ester-urethane)s, was synthesized and characterized. The first step of the synthesis consisted of the ring opening polymerization of L-lactide, initiated by the hydroxyl terminal groups of the PCL chain, followed by the chain extension of these PLA-PCL-PLA triblocks, using hexamethylene diisocyanate (HDI). The trimers comprised PCL2000 flexible segments, while the length of each PLA block covered the 550-6000 molecular weight range. The morphology of the copolymers gradually changed, as the length of the PLA blocks increased. The multiblock copolymers produced displayed enhanced mechanical properties, with ultimate tensile strength values around 32 MPa, Young's modulus as low as 30 MPa and elongation at break values well above 600%. The longer the PLA block, the slower the in vitro degradation of the material, with all copolymers degrading faster than the respective homopolymers.
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Affiliation(s)
- D Cohn
- Casali Institute of Applied Chemistry, Hebrew University of Jerusalem, Gival Ram Campus, Jerusalem 91904, Israel
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Cohn D, Hotovely-Salomon A. Biodegradable multiblock PEO/PLA thermoplastic elastomers: molecular design and properties. POLYMER 2005. [DOI: 10.1016/j.polymer.2005.01.012] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Kannan RY, Salacinski HJ, Butler PE, Hamilton G, Seifalian AM. Current status of prosthetic bypass grafts: A review. J Biomed Mater Res B Appl Biomater 2005; 74:570-81. [PMID: 15889440 DOI: 10.1002/jbm.b.30247] [Citation(s) in RCA: 334] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Polymers such as Dacron and polytetrafluoroethylene (PTFE) have been used in high flow states with relative success but with limited application at lower flow states. Newer polymers with greater compliance, biomimicry, and ability to evolve into hybrid prostheses, suitable as smaller vessels, are now being introduced. In view of the advances in tissue engineering, this makes possible the creation of an ideal off-the-shelf bypass graft. We present a broad overview of the current state of prosthetic bypass grafts.
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Affiliation(s)
- Ruben Y Kannan
- Biomaterials & Tissue Engineering Centre, University Department of Surgery, Royal Free and University College Medical School, University College London, UK
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Perego G, Preda P, Pasquinelli G, Curti T, Freyrie A, Cenni E. Functionalization of poly-L-lactic-co-ε-caprolactone: effects of surface modification on endothelial cell proliferation and hemocompatibility. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2003; 14:1057-75. [PMID: 14661879 DOI: 10.1163/156856203769231565] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A copolymer of L-lactic acid and epsilon-caprolactone (PLLACL) was synthesized with the aim of preparing a bioartificial, small-diameter and partially resorbable vascular graft. The material was submitted to surface functionalizations (i.e. chemical modification by means of hydrolytic 'etching' and plasma discharge) to promote endothelial cell (EC) adhesion and growth avoiding platelet adhesion or coagulation factor absorption. Furthermore, the behaviour of human microvascular endothelial cells (HMVEC) seeded on the untreated and treated copolymer is described, as well as the platelet adhesion and the modifications of coagulation factors determined by the copolymer itself. PLLACL in its native state provided little support for EC adhesion. Improved EC adherence was obtained when functional groups were provided on the polymer surface by surface chemical hydrolysis. HMVEC seeded and cultured on the polymer surface did not show any ultrastructural alteration, thus demonstrating the absence of the polymer cytotoxicity. Moreover, SEM analysis performed on cold plasma modified specimens showed the presence of a subconfluent monolayer of EC, with an elongated spread morphology. Both the untreated and treated copolymers induced only slight variations of platelet number, but determined the activated partial thromboplastin time (APTT) increase, due to factor XI reduction. Finally, a prototype of partially biodegradable vascular prosthesis was prepared with NaOH/HCl-treated copolymer. Pre-cultured HMVEC seeding of the prosthesis by means of a rotation device resulted in an almost completely coverage of the graft inner surface.
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Abstract
Recently, block copolymers have got tremendous impetus on the ongoing research in the area of drug delivery technology, due to their capability to provide a biomaterial having a broad range of amphiphilic characteristics, as well as targeting the drugs to specific site. This article is an attempt to review applications of block copolymers in surface modification, drug targeting, nano and microparticles, hydrogels, micelles etc. The physicochemical properties of block copolymers and various synthetic routes for block copolymers are also discussed.
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Affiliation(s)
- N Kumar
- Department of Medicinal Chemistry and Natural Products, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
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