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Kamperman T, Henke S, Crispim JF, Willemen NGA, Dijkstra PJ, Lee W, Offerhaus HL, Neubauer M, Smink AM, de Vos P, de Haan BJ, Karperien M, Shin SR, Leijten J. Tethering Cells via Enzymatic Oxidative Crosslinking Enables Mechanotransduction in Non-Cell-Adhesive Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2102660. [PMID: 34476848 PMCID: PMC8530967 DOI: 10.1002/adma.202102660] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 07/10/2021] [Indexed: 05/14/2023]
Abstract
Cell-matrix interactions govern cell behavior and tissue function by facilitating transduction of biomechanical cues. Engineered tissues often incorporate these interactions by employing cell-adhesive materials. However, using constitutively active cell-adhesive materials impedes control over cell fate and elicits inflammatory responses upon implantation. Here, an alternative cell-material interaction strategy that provides mechanotransducive properties via discrete inducible on-cell crosslinking (DOCKING) of materials, including those that are inherently non-cell-adhesive, is introduced. Specifically, tyramine-functionalized materials are tethered to tyrosines that are naturally present in extracellular protein domains via enzyme-mediated oxidative crosslinking. Temporal control over the stiffness of on-cell tethered 3D microniches reveals that DOCKING uniquely enables lineage programming of stem cells by targeting adhesome-related mechanotransduction pathways acting independently of cell volume changes and spreading. In short, DOCKING represents a bioinspired and cytocompatible cell-tethering strategy that offers new routes to study and engineer cell-material interactions, thereby advancing applications ranging from drug delivery, to cell-based therapy, and cultured meat.
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Affiliation(s)
- Tom Kamperman
- Department of Developmental BioEngineering, Faculty of Science and Technology, Technical Medical Centre, University of Twente, Drienerlolaan 5, Enschede, 7522NB, The Netherlands
- Division of Engineering in Medicine, Brigham and Women's Hospital, Harvard Medical School, 65 Landsdowne Street, Cambridge, MA, 02139, USA
| | - Sieger Henke
- Department of Developmental BioEngineering, Faculty of Science and Technology, Technical Medical Centre, University of Twente, Drienerlolaan 5, Enschede, 7522NB, The Netherlands
| | - João F Crispim
- Department of Developmental BioEngineering, Faculty of Science and Technology, Technical Medical Centre, University of Twente, Drienerlolaan 5, Enschede, 7522NB, The Netherlands
| | - Niels G A Willemen
- Department of Developmental BioEngineering, Faculty of Science and Technology, Technical Medical Centre, University of Twente, Drienerlolaan 5, Enschede, 7522NB, The Netherlands
| | - Pieter J Dijkstra
- Department of Developmental BioEngineering, Faculty of Science and Technology, Technical Medical Centre, University of Twente, Drienerlolaan 5, Enschede, 7522NB, The Netherlands
| | - Wooje Lee
- Optical Sciences, MESA+ Institute for Nanotechnology, University of Twente, Drienerlolaan 5, Enschede, 7522NB, The Netherlands
| | - Herman L Offerhaus
- Optical Sciences, MESA+ Institute for Nanotechnology, University of Twente, Drienerlolaan 5, Enschede, 7522NB, The Netherlands
| | - Martin Neubauer
- Physical Chemistry II, University of Bayreuth, Universitätsstrasse 30, D-95447, Bayreuth, Germany
| | - Alexandra M Smink
- Department of Pathology and Medical Biology, Section of Immunoendocrinology, University of Groningen, University Medical Center Groningen, Hanzeplein 1 (EA11), Groningen, 9713 GZ, The Netherlands
| | - Paul de Vos
- Department of Pathology and Medical Biology, Section of Immunoendocrinology, University of Groningen, University Medical Center Groningen, Hanzeplein 1 (EA11), Groningen, 9713 GZ, The Netherlands
| | - Bart J de Haan
- Department of Pathology and Medical Biology, Section of Immunoendocrinology, University of Groningen, University Medical Center Groningen, Hanzeplein 1 (EA11), Groningen, 9713 GZ, The Netherlands
| | - Marcel Karperien
- Department of Developmental BioEngineering, Faculty of Science and Technology, Technical Medical Centre, University of Twente, Drienerlolaan 5, Enschede, 7522NB, The Netherlands
| | - Su Ryon Shin
- Division of Engineering in Medicine, Brigham and Women's Hospital, Harvard Medical School, 65 Landsdowne Street, Cambridge, MA, 02139, USA
| | - Jeroen Leijten
- Department of Developmental BioEngineering, Faculty of Science and Technology, Technical Medical Centre, University of Twente, Drienerlolaan 5, Enschede, 7522NB, The Netherlands
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de la Torre Hernandez JM, Otaegui I, Subinas A, Gomez-Menchero A, Moreno R, Rondan J, Muñoz-Garcia E, Sainz-Laso F, Garcia Del Blanco B, Rumoroso JR, Diaz JF, Berenguer A, Gomez-Lara J, Zueco J. First-in-Man Evaluation of a Sirolimus-Eluting Stent With Abluminal Fluoropolymeric/Triflusal Coating With Ultrathin Struts by OCT at 9 Months' Follow-Up: The PROMETHEUS Study. CARDIOVASCULAR REVASCULARIZATION MEDICINE 2021; 32:18-24. [PMID: 33386256 DOI: 10.1016/j.carrev.2020.12.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 12/22/2020] [Accepted: 12/22/2020] [Indexed: 10/22/2022]
Abstract
OBJECTIVES We sought to investigate stent healing and neointimal hyperplasia with ihtDEStiny drug-eluting stent (DES) by optical coherence tomography (OCT) examination conducted 9 months after implantation. BACKGROUND The currently used DES present certain features that have been linked separately to their better performance in terms of efficacy and safety. METHODS First-in-man, prospective and multicenter study including patients treated with ihtDEStiny stent undergoing OCT examination at 9 months follow up. The ihtDEStiny stent is a sirolimus eluting stent with an oval shape ultrathin struts (68 μm) and an abluminal coating of a fluoropolymer containing the antiplatelet agent triflusal. Primary endpoint was the percentage of obstruction of the in-stent volume by the neointima. RESULTS In 58 patients (63 lesions) in-stent late lumen loss was 0.11 ± 0.23 mm (95% CI 0.05-0.16) with only in 6% of stents being > 0.5 mm and in-segment binary stenosis was 1.6%. In OCT mean neointima volume obstruction was 10.5 ± 6.9% with a mean neointima thickness of 110.9 ± 89.8 μm. The proportion of uncovered struts was 2.5%, malapposed struts 1.1% and malapposed/uncovered struts 0.7% and no subclinical thrombi detected. Mean incomplete stent apposition area was 0.1 ± 0.1 mm2. At 12 months target lesion revascularization rate was 3% and no stent thrombosis was reported. CONCLUSIONS In this study the ihtDEStiny stent has shown a very low degree of neointimal proliferation associated with a low rate of uncovered/malapposed struts and total absence of subclinical thrombi at 9 months follow up.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | - Javier Zueco
- Hospital Marques de Valdecilla, IDIVAL, Santander, Spain
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Torii S, Cheng Q, Mori H, Lipinski MJ, Acampado E, Perkins LE, Hossainy SF, Pacetti SD, Kolodgie FD, Virmani R, Finn AV. Acute thrombogenicity of fluoropolymer-coated versus biodegradable and polymer-free stents. EUROINTERVENTION 2019; 14:1685-1693. [DOI: 10.4244/eij-d-17-00728] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Giol ED, Van Vlierberghe S, Unger RE, Kersemans K, de Vos F, Kirkpatrick CJ, Dubruel P. Biomimetic strategy towards gelatin coatings on PET. Effect of protocol on coating stability and cell-interactive properties. J Mater Chem B 2019; 7:1258-1269. [PMID: 32255165 DOI: 10.1039/c8tb02676a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Gelatin-modified poly(ethylene terephthalate) (PET) surfaces have been previously realized via an intermediate dopamine coating procedure that resulted in surfaces with superior haemocompatibility compared to unfunctionalized PET. The present study addresses the biocompatibility assessment of these coated PET surfaces. In this context, the stability of the gelatin coating upon exposure to physiological conditions and its cell-interactive properties were investigated. The proposed gelatin-dopamine-PET surfaces showed an increased protein coating stability up to 24 days and promoted the attachment and spreading of both endothelial cells (ECs) and smooth muscle cells (SMCs). In parallel, physisorbed gelatin coatings exhibited similar cell-interactive properties, albeit temporarily, as the coating delaminated within 1 week after cell seeding. Furthermore, no or only minimal immunogenic or inflammatory responses were observed during in vitro cytotoxicity and endotoxicity assessment for all gelatin-modified PET surfaces evaluated. Overall, the combined enhanced biocompatibility reported herein together with the previously proven haemocompatibility show the potential of the gelatin-dopamine-PET surfaces to function as vascular graft candidates.
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Affiliation(s)
- Elena Diana Giol
- Polymer Chemistry and Biomaterials Research (PBM) Group, Centre of Macromolecular Chemistry, Ghent University (UGent), Krijgslaan 281, S4-bis, B-9000, Ghent, Belgium.
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Tang SH, Domino MY, Venault A, Lin HT, Hsieh C, Higuchi A, Chinnathambi A, Alharbi SA, Tayo LL, Chang Y. Bioinert Control of Zwitterionic Poly(ethylene terephtalate) Fibrous Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:1727-1739. [PMID: 29925240 DOI: 10.1021/acs.langmuir.8b00634] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Poly(ethylene terephtalate) (PET)-based materials face general biofouling issues that we addressed by grafting a copolymer of glycidyl methacrylate and sulfobetaine methacrylate, poly(GMA- r-SBMA). The grafting procedure involved a dip-coating step followed by UV-exposure and led to successful grafting of the copolymer as evidenced by X-ray photoelectron spectroscopy and zeta potential measurements. It did not modify the pore size nor the porosity of the PET membranes. In addition, their surface hydrophilicity was considerably improved, with a water contact angle falling to 30° in less than 20 s and 0° in less than 1 min. The effect of copolymer concentration in the coating bath (dip-coating procedure) and UV exposure time (UV step) were scrutinized during biofouling studies involving several bacteria such as Escherichia coli and Stenotrophomonas maltophilia, but also whole blood and HT1080 fibroblasts cells. The results indicate that if all conditions led to improved biofouling mitigation, due to the efficiency of the zwitterionic copolymer and grafting procedure, a higher concentration (15 mg/mL) and longer UV exposure time (at least 10 min) enhanced the grafting density which reflected on the biofouling results and permitted a better general biofouling control regardless of the nature of the biofoulant (bacteria, blood cells, fibroblasts).
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Affiliation(s)
- Shuo-Hsi Tang
- Department of Chemical Engineering and R&D Center for Membrane Technology , Chung Yuan Christian University , Chungli District, Taoyuan 320 , Taiwan R.O.C
| | - Maria Ysabel Domino
- School of Chemical Engineering and Chemistry, Mapúa Institute of Technology , Mapúa University , Muralla St , Intramuros, Manila , 1002 Metro Manila , Philippines
| | - Antoine Venault
- Department of Chemical Engineering and R&D Center for Membrane Technology , Chung Yuan Christian University , Chungli District, Taoyuan 320 , Taiwan R.O.C
| | - Hao-Tung Lin
- Department of Chemical Engineering and R&D Center for Membrane Technology , Chung Yuan Christian University , Chungli District, Taoyuan 320 , Taiwan R.O.C
| | - Chun Hsieh
- Department of Chemical Engineering and R&D Center for Membrane Technology , Chung Yuan Christian University , Chungli District, Taoyuan 320 , Taiwan R.O.C
| | - Akon Higuchi
- Department of Chemical and Materials Engineering , National Central University , Jhong-Li, Taoyuan 320 , Taiwan ROC
- Department of Botany and Microbiology, College of Science , King Saud University , P.O. Box 2455, Riyadh 11451 , Saudi Arabia
| | - Arunachalam Chinnathambi
- Department of Botany and Microbiology, College of Science , King Saud University , P.O. Box 2455, Riyadh 11451 , Saudi Arabia
| | - Sulaiman Ali Alharbi
- Department of Botany and Microbiology, College of Science , King Saud University , P.O. Box 2455, Riyadh 11451 , Saudi Arabia
| | - Lemmuel L Tayo
- School of Chemical Engineering and Chemistry, Mapúa Institute of Technology , Mapúa University , Muralla St , Intramuros, Manila , 1002 Metro Manila , Philippines
| | - Yung Chang
- Department of Chemical Engineering and R&D Center for Membrane Technology , Chung Yuan Christian University , Chungli District, Taoyuan 320 , Taiwan R.O.C
- Department of Botany and Microbiology, College of Science , King Saud University , P.O. Box 2455, Riyadh 11451 , Saudi Arabia
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Giol ED, Van Vlierberghe S, Unger RE, Schaubroeck D, Ottevaere H, Thienpont H, Kirkpatrick CJ, Dubruel P. Endothelialization and Anticoagulation Potential of Surface-Modified PET Intended for Vascular Applications. Macromol Biosci 2018; 18:e1800125. [DOI: 10.1002/mabi.201800125] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 05/07/2018] [Indexed: 01/17/2023]
Affiliation(s)
- Elena Diana Giol
- Polymer Chemistry and Biomaterials Research (PBM) Group; Centre of Macromolecular Chemistry; Ghent University; Krijgslaan 281, S4-bis B-9000 Belgium
| | - Sandra Van Vlierberghe
- Polymer Chemistry and Biomaterials Research (PBM) Group; Centre of Macromolecular Chemistry; Ghent University; Krijgslaan 281, S4-bis B-9000 Belgium
- Brussels Photonics (B-PHOT); Vrije Universiteit Brussel; Pleinlaan 2 B-1050 Belgium
| | - Ronald E. Unger
- REPAIR LAB; University Medical Center of the Johannes Gutenberg University Mainz; Langenbeckstraat 1 55131 Germany
| | - David Schaubroeck
- Centre of Microsystems Technology (CMST); imec and Ghent University; Technologiepark-Zwijnaarde15 B-9052 Belgium
| | - Heidi Ottevaere
- Brussels Photonics (B-PHOT); Vrije Universiteit Brussel; Pleinlaan 2 B-1050 Belgium
| | - Hugo Thienpont
- Brussels Photonics (B-PHOT); Vrije Universiteit Brussel; Pleinlaan 2 B-1050 Belgium
| | - Charles James Kirkpatrick
- REPAIR LAB; University Medical Center of the Johannes Gutenberg University Mainz; Langenbeckstraat 1 55131 Germany
| | - Peter Dubruel
- Polymer Chemistry and Biomaterials Research (PBM) Group; Centre of Macromolecular Chemistry; Ghent University; Krijgslaan 281, S4-bis B-9000 Belgium
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7
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Mori H, Jinnouchi H, Diljon C, Torii S, Sakamoto A, Kolodgie FD, Virmani R, Finn AV. A new category stent with novel polyphosphazene surface modification. Future Cardiol 2018; 14:225-235. [DOI: 10.2217/fca-2017-0103] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The COBRA-PzF™ (CeloNova BioSciences, Inc., TX, USA) is a new type of coronary stent composed of a cobalt chromium metallic backbone surrounded by a nanothin layer of Polyzene-F (PzF) without any added drug. Evidence from basic studies supports antithrombotic and anti-inflammatory properties for the PzF surface coating. Preclinical studies support the thromboresistance of PzF-coated surfaces and clinical studies have shown good outcomes for patients receiving this device with very low rates of stent thrombosis. COBRA-PzF may be especially useful in patients at high risk for bleeding. Ongoing clinical trials will determine whether shortening the duration of dual antiplatelet therapy to less than 1 month is feasible and these data may represent a new paradigm with regards to patients at high risk for bleeding.
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Affiliation(s)
| | | | - Chahal Diljon
- University of Maryland, School of Medicine, Baltimore, MD 21201, USA
| | - Sho Torii
- CVPath Institute, Gaithersburg, MD 20878, USA
| | | | | | | | - Aloke V Finn
- CVPath Institute, Gaithersburg, MD 20878, USA
- University of Maryland, School of Medicine, Baltimore, MD 21201, USA
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Gu Y, Tabata Y, Kawakami Y, Balamurugan AN, Hori H, Nagata N, Satake A, Cui W, Qi M, Misawa Y, Toma M, Miyamoto M, Nozawa M, Inoue K. Development of a New Method to Induce Angiogenesis at Subcutaneous Site of Streptozotocin-Induced Diabetic Rats for Islet Transplantation. Cell Transplant 2017. [DOI: 10.3727/000000001783986693] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
The subcutaneous space is a potential site for clinical islet transplantation. Even though there are several advantages, poor blood supply at this site mainly causes failure of islet survival. In this study, angiogenesis was induced in advance at the diabetic rats subcutis for islet transplantation by implanting a polyethylene terephthalate (PET) mesh bag containing gelatin microspheres incorporating basic fibroblast growth factor (bFGF) (MS/bFGF) and a collagen sponge. The bFGF was incorporated into gelatin microspheres for controlled release of bFGF. As controls, a PET mesh bag with or without either collagen sponges or MS/bFGF was implanted at the subcutaneous site of diabetic rats. Macroscopic and microscopic examinations revealed the formation of capillary network in and around the PET mesh bag containing MS/bFGF and collagen sponges 7 days after implantation when compare with other control groups. When tissue hemoglobin level was also measured, a significantly high level of hemoglobin amount was observed compared with that of control groups. When allogeneic islets mixed with 5% agarose were transplanted into the prevascularized rat subcutis, normoglycemia was maintained for more than 40 days, while other control groups were ineffective. This study demonstrated that combination of gelatin microspheres incorporating bFGF and collagen sponges enabled the mesh to induce neovascularization even at the subcutaneous site of streptozotocin-induced diabetic rats, resulting in improved function of islet transplantation.
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Affiliation(s)
- Yuanjun Gu
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Yasuhiko Tabata
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Yoshiyuki Kawakami
- Department of Surgical Basic Science, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | | | - Hiroshi Hori
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Natsuki Nagata
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Akira Satake
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Wanxing Cui
- Department of Surgical Basic Science, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Meirigeng Qi
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Yoko Misawa
- Department of Surgical Basic Science, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Maki Toma
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Masaaki Miyamoto
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Masumi Nozawa
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
| | - Kazutomo Inoue
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
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Hou D, Huibregtse BA, Eppihimer M, Stoffregen W, Kocur G, Hitzman C, Stejskal E, Heil J, Dawkins KD. Fluorocopolymer-coated nitinol self-expanding paclitaxel-eluting stent: pharmacokinetics and vascular biology responses in a porcine iliofemoral model. EUROINTERVENTION 2016; 12:790-7. [DOI: 10.4244/eijv12i6a128] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Kang SH, Chae IH, Park JJ, Lee HS, Kang DY, Hwang SS, Youn TJ, Kim HS. Stent Thrombosis With Drug-Eluting Stents and Bioresorbable Scaffolds. JACC Cardiovasc Interv 2016; 9:1203-1212. [DOI: 10.1016/j.jcin.2016.03.038] [Citation(s) in RCA: 81] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 03/24/2016] [Indexed: 10/21/2022]
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Rahim MI, Tavares A, Evertz F, Kieke M, Seitz JM, Eifler R, Weizbauer A, Willbold E, Jürgen Maier H, Glasmacher B, Behrens P, Hauser H, Mueller PP. Phosphate conversion coating reduces the degradation rate and suppresses side effects of metallic magnesium implants in an animal model. J Biomed Mater Res B Appl Biomater 2016; 105:1622-1635. [DOI: 10.1002/jbm.b.33704] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Revised: 02/05/2016] [Accepted: 04/21/2016] [Indexed: 01/02/2023]
Affiliation(s)
- Muhammad Imran Rahim
- Helmholtz Centre for Infection Research; Inhoffenstrasse 7 38124 Braunschweig Germany
| | - Ana Tavares
- Institute for Multiphase Processes, Leibniz University of Hannover; Appelstrasse 11 30167 Hannover Germany
| | - Florian Evertz
- Institute for Multiphase Processes, Leibniz University of Hannover; Appelstrasse 11 30167 Hannover Germany
| | - Marc Kieke
- Institute for Inorganic Chemistry, Leibniz University of Hannover; Callinstrasse 9 30167 Hannover Germany
| | - Jan-Marten Seitz
- Institute of Materials Science, Leibniz University of Hannover; An der Universität 2 30823 Garbsen Germany
- Department of Materials Science and Engineering; Michigan Technological University; 1400 Townsend Dr. Houghton Michigan 49931
| | - Rainer Eifler
- Institute of Materials Science, Leibniz University of Hannover; An der Universität 2 30823 Garbsen Germany
| | - Andreas Weizbauer
- CrossBIT, Center for Biocompatibility and Implant-Immunology, Department of Orthopedic Surgery, Hannover Medical School; Feodor-Lynen-Strasse 31 30625 Hannover Germany
- Laboratory for Biomechanics and Biomaterials, Department of Orthopedic Surgery; Hannover Medical School; Anna-von-Borries-Strasse 1-7 30625 Hannover Germany
| | - Elmar Willbold
- CrossBIT, Center for Biocompatibility and Implant-Immunology, Department of Orthopedic Surgery, Hannover Medical School; Feodor-Lynen-Strasse 31 30625 Hannover Germany
- Laboratory for Biomechanics and Biomaterials, Department of Orthopedic Surgery; Hannover Medical School; Anna-von-Borries-Strasse 1-7 30625 Hannover Germany
| | - Hans Jürgen Maier
- Institute of Materials Science, Leibniz University of Hannover; An der Universität 2 30823 Garbsen Germany
| | - Birgit Glasmacher
- Institute for Multiphase Processes, Leibniz University of Hannover; Appelstrasse 11 30167 Hannover Germany
| | - Peter Behrens
- Institute for Inorganic Chemistry, Leibniz University of Hannover; Callinstrasse 9 30167 Hannover Germany
| | - Hansjörg Hauser
- Helmholtz Centre for Infection Research; Inhoffenstrasse 7 38124 Braunschweig Germany
| | - Peter P. Mueller
- Helmholtz Centre for Infection Research; Inhoffenstrasse 7 38124 Braunschweig Germany
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Otsuka F, Cheng Q, Yahagi K, Acampado E, Sheehy A, Yazdani SK, Sakakura K, Euller K, Perkins LE, Kolodgie FD, Virmani R, Joner M. Acute Thrombogenicity of a Durable Polymer Everolimus-Eluting Stent Relative to Contemporary Drug-Eluting Stents With Biodegradable Polymer Coatings Assessed Ex Vivo in a Swine Shunt Model. JACC Cardiovasc Interv 2015; 8:1248-1260. [DOI: 10.1016/j.jcin.2015.03.029] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Accepted: 03/01/2015] [Indexed: 12/01/2022]
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Clinical outcomes with bioabsorbable polymer- versus durable polymer-based drug-eluting and bare-metal stents: evidence from a comprehensive network meta-analysis. J Am Coll Cardiol 2013; 63:299-307. [PMID: 24211507 DOI: 10.1016/j.jacc.2013.09.061] [Citation(s) in RCA: 230] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2013] [Revised: 09/03/2013] [Accepted: 09/17/2013] [Indexed: 02/07/2023]
Abstract
OBJECTIVES This study sought to investigate the relative safety and efficacy of bioabsorbable polymer (BP)-based biolimus-eluting stents (BES) versus durable-polymer (DP)-drug-eluting stents (DES) and bare-metal stents (BMS) by means of a network meta-analysis. BACKGROUND Studies have suggested that BP-BES might reduce the risk of stent thrombosis (ST) and late adverse outcomes compared with first-generation DES. However, the relative safety and efficacy of BP-BES versus newer-generation DES coated with more biocompatible DP have not been investigated in depth. METHODS Randomized controlled trials comparing BP-BES versus currently U.S.-approved DES or BMS were searched through MEDLINE, EMBASE, and Cochrane databases. Information on study design, inclusion and exclusion criteria, sample characteristics, and clinical outcomes was extracted. RESULTS Data from 89 trials including 85,490 patients were analyzed. At 1-year follow-up, BP-BES were associated with lower rates of cardiac death/myocardial infarction (MI), MI, and target vessel revascularization (TVR) than BMS and lower rates of TVR than fast-release zotarolimus-eluting stents. The BP-BES had similar rates of cardiac death/MI, MI, and TVR compared with other second-generation DP-DES but higher rates of 1-year ST than cobalt-chromium everolimus-eluting stents (CoCr-EES). The BP-BES were associated with improved late outcomes compared with BMS and paclitaxel-eluting stents, considering the latest follow-up data available, with nonsignificantly different outcomes compared with other DP-DES although higher rates of definite ST compared with CoCr-EES. CONCLUSIONS In this large-scale network meta-analysis, BP-BES were associated with superior clinical outcomes compared with BMS and first-generation DES and similar rates of cardiac death/MI, MI, and TVR compared with second-generation DP-DES but higher rates of definite ST than CoCr-EES.
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Luo J, Lv W, Deng Y, Sun Y. Cellulose-ethylenediaminetetraacetic acid conjugates protect mammalian cells from bacterial cells. Biomacromolecules 2013; 14:1054-62. [PMID: 23458445 DOI: 10.1021/bm301922z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cellulose-ethylenediaminetetraacetic acid (EDTA) conjugates were synthesized by the esterification of cellulose with ethylenediaminetetraacetic dianhydride (EDTAD). The new materials provided potent antimicrobial activities against Staphylococcus aureus (S. aureus, Gram-positive bacteria) and Pseudomonas aeruginosa (P. aeruginosa, Gram-negative bacteria), and inhibited the formation of bacterial biofilms. The biocompatibility of the new cellulose-EDTA conjugates was evaluated with mouse skin fibroblasts for up to 14 days. SEM observation and DNA content analysis suggested that the new materials sustained the viability of fibroblast cells. Moreover, in mouse skin fibroblast-bacteria co-culture systems, the new cellulose-EDTA conjugates prevented bacterial biofilm formation and protected the mammalian cells from the bacterial cells for at least one day.
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Affiliation(s)
- Jie Luo
- Department of Chemistry, University of Massachusetts Lowell, Lowell, Massachusetts 01842, USA
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Hermiller JB, Sudhir K, Applegate RJ, Rizvi A, Wang J, Gordon PC, Yaqub M, Cao S, Ferguson JM, Smith RS, Sood P, Stone GW. Impact of age on clinical outcomes after everolimus-eluting and paclitaxel-eluting stent implantation: pooled analysis from the SPIRIT III and SPIRIT IV clinical trials. EUROINTERVENTION 2012; 8:87-93. [PMID: 22580252 DOI: 10.4244/eijv8i1a14] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
AIMS The impact of age on outcomes following everolimus-eluting stent (EES) or paclitaxel-eluting stent (PES) implantation was evaluated in a patient-level pooled analysis of the SPIRIT III (n=1,002) and SPIRIT IV (n=3,687) trials. METHODS AND RESULTS Clinical outcomes with EES compared to PES in elderly (≥ 65 years, n=2,071) and younger (<65 years, n=2,617) patients were evaluated at one year. At one year, elderly patients treated with EES rather than PES showed a significant reduction in target lesion failure (TLF) (3.9% EES vs. 6.8% PES, p=0.006), major adverse cardiac events (MACE) (4.0% EES vs. 7.1% PES, p=0.005), and ischaemia-driven target lesion revascularisation (ID-TLR) (2.0% EES vs. 4.0% PES, p=0.01). Younger patients treated with EES rather than PES also had significantly reduced one-year rates of TLF (4.9% EES vs. 7.9% PES, p=0.003), MACE (5.0% EES vs. 8.0% PES, p=0.004), target vessel myocardial infarction (MI) (2.0% EES vs. 3.4% PES, p=0.04), ID-TLR (3.3% EES vs. 5.5% PES, p=0.01) and stent thrombosis (0.5% EES vs. 1.6% PES, p=0.01). CONCLUSIONS In a pooled analysis from the SPIRIT III and IV trials, EES was safer and more effective than PES in both younger and older cohorts as evidenced by lower rates of TLR, TLF and MACE.
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Sheng Y, Wang W, Chen P. Interaction of an ionic complementary peptide with a hydrophobic graphite surface. Protein Sci 2010; 19:1639-48. [PMID: 20572020 PMCID: PMC2975128 DOI: 10.1002/pro.444] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2010] [Revised: 04/12/2010] [Accepted: 06/08/2010] [Indexed: 11/11/2022]
Abstract
Protein adsorption on a surface plays an important role in biomaterial science and medicine. It is strongly related to the interaction between the protein residues and the surface. Here we report all-atom molecular dynamics simulations of the adsorption of an ionic complementary peptide, EAK16-II, to the hydrophobic highly ordered pyrolytic graphite surface. We find that, the hydrophobic interaction is the main force to govern the adsorption, and the peptide interchain electrostatic interaction affects the adsorption rate. Under neutral pH condition, the interchain electrostatic attraction facilitates the adsorption, whereas under acidic and basic conditions, because of the protonation and deprotonation of glutamic acid and lysine residues, respectively, the resulting electrostatic repulsion slows down the adsorption. We also found that under basic condition, during the adsorption peptide Chain II will be up against a choice to adsorb to the surface through the hydrophobic interaction or to form a temporary hydrophobic core with the deposited peptide Chain I. These results provide a basis for understanding some of the fundamental interactions governing peptide adsorption on the surface, which can shed new light on novel applications, such as the design of implant devices and drug delivery materials.
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Affiliation(s)
- Yuebiao Sheng
- Department of Chemical Engineering, University of WaterlooWaterloo, Ontario, Canada N2L 3G1
- Department of Physics, National Laboratory of Solid State Microstructure, and Institute of Biophysics, Nanjing University210093, China
| | - Wei Wang
- Department of Physics, National Laboratory of Solid State Microstructure, and Institute of Biophysics, Nanjing University210093, China
| | - P Chen
- Department of Chemical Engineering, University of WaterlooWaterloo, Ontario, Canada N2L 3G1
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Xie X, Guidoin R, Nutley M, Zhang Z. Fluoropassivation and gelatin sealing of polyester arterial prostheses to skip preclotting and constrain the chronic inflammatory response. J Biomed Mater Res B Appl Biomater 2010; 93:497-509. [PMID: 20186827 DOI: 10.1002/jbm.b.31609] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Fluoropassivation and gelatin coating have been applied to polyethylene terephthalate (PET) vascular prosthesis to combine the advantages of both polytetrafluoroethylene (PTFE) and PET materials, and to eliminate the preclotting procedure. The morphological, chemical, physical, and mechanical properties of such prostheses were investigated and compared with its original model. Fluoropassivation introduced -OCF(3), -CF(3), and -CFCF(2)- structures onto the surface of the polyester fibers. However, the surface fluorine content was only 28-32% compared to the 66% in expanded PTFE (ePTFE) grafts. The fluoropassivation decreased the hydrophilicity, slightly increased the water permeability, and marginally lowered the melting point and the crystallinity of the PET fibers. After gelatin coating, the fluoropassivated and nonfluoropassivated prostheses showed similar surface morphology and chemistry. While gelatin coating eliminated preclotting, it also renders the prostheses slightly stiffer. The original prosthesis had the highest bursting strength (275 N), with the fluoropassivated and gelatin-sealed devices showing similar bursting strength between 210 and 230 N. Fluoropassivation and gelatin coating lowered the retention strength by 23 and 30% on average, respectively. In vitro enzymatic incubation had only marginal effect on the surface fluorine content of the nongelatin-sealed prostheses. However, the gelatin-sealed ones significantly lost their surface fluorine after in vitro enzymatic incubation (by 69-85%) or in vivo 6-month implantation (by 51-60%), showing the lability of the fluoropolymer layer under the hostile biological environment.
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Affiliation(s)
- Xingyi Xie
- Department of Polymeric Biomaterials and Artificial Organs, College of Polymer Science and Engineering, Sichuan University, Chengdu, Sichuan, People's Republic of China
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Chin-Quee SL, Hsu SH, Nguyen-Ehrenreich KL, Tai JT, Abraham GM, Pacetti SD, Chan YF, Nakazawa G, Kolodgie FD, Virmani R, Ding NN, Coleman LA. Endothelial cell recovery, acute thrombogenicity, and monocyte adhesion and activation on fluorinated copolymer and phosphorylcholine polymer stent coatings. Biomaterials 2010; 31:648-57. [DOI: 10.1016/j.biomaterials.2009.09.079] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2009] [Accepted: 09/21/2009] [Indexed: 11/28/2022]
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20
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Gupta B, Grover N, Mohanty S, Jain KG, Singh H. Radiation grafting of acrylic acid/N-vinyl pyrrolidone binary mixture onto poly(ethylene terephthalate) fabric and growth of human mesenchymal stem cell. J Appl Polym Sci 2010. [DOI: 10.1002/app.30915] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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21
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Joseph R, Shelma R, Rajeev A, Muraleedharan CV. Characterization of surface modified polyester fabric. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2009; 20 Suppl 1:S153-S159. [PMID: 18584122 DOI: 10.1007/s10856-008-3502-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2007] [Accepted: 06/10/2008] [Indexed: 05/26/2023]
Abstract
Woven polyethylene terephthalate (PET) fabric has been used in the construction of vascular grafts and sewing ring of prosthetic heart valves. In an effort to improve haemocompatibility and tissue response to PET fabric, a fluoropolymer, polyvinylidine fluoride (PVDF), was coated on PET fabric by dip coating technique. The coating was found to be uniform and no significant changes occurred on physical properties such as water permeability and burst strength. Cell culture cytotoxicity studies showed that coated PET was non-cytotoxic to L929 fibroblast cell lines. In vitro studies revealed that coating improved haemocompatibility of PET fabric material. Coating reduced platelet consumption of PET fabric by 50%. Upon surface modification leukocyte consumption of PET was reduced by 24%. About 60% reduction in partial thromboplastin time (PTT) observed when PET was coated with PVDF. Results of endothelial cell proliferation studies showed that surface coating did not have any substantial impact on cell proliferation. Overall results indicate that coating has potential to improve haemocompatibility of PET fabric without affecting its mechanical performance.
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Affiliation(s)
- Roy Joseph
- Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum 695012, Kerala, India.
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22
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Gupta B, Grover N, Singh H. Radiation grafting of acrylic acid onto poly(ethylene terephthalate) fabric. J Appl Polym Sci 2009. [DOI: 10.1002/app.29546] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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23
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DING NI(NADINE, PACETTI STEPHEND, TANG FUHWEI, GADA MANISH, ROORDA WOUTER. XIENCE V™ Stent Design and Rationale. J Interv Cardiol 2009. [DOI: 10.1111/j.1540-8183.2009.00450.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Yang H, Fung SY, Pritzker M, Chen P. Modification of hydrophilic and hydrophobic surfaces using an ionic-complementary peptide. PLoS One 2007; 2:e1325. [PMID: 18091996 PMCID: PMC2117347 DOI: 10.1371/journal.pone.0001325] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2007] [Accepted: 11/22/2007] [Indexed: 12/03/2022] Open
Abstract
Ionic-complementary peptides are novel nano-biomaterials with a variety of biomedical applications including potential biosurface engineering. This study presents evidence that a model ionic-complementary peptide EAK16-II is capable of assembling/coating on hydrophilic mica as well as hydrophobic highly ordered pyrolytic graphite (HOPG) surfaces with different nano-patterns. EAK16-II forms randomly oriented nanofibers or nanofiber networks on mica, while ordered nanofibers parallel or oriented 60° or 120° to each other on HOPG, reflecting the crystallographic symmetry of graphite (0001). The density of coated nanofibers on both surfaces can be controlled by adjusting the peptide concentration and the contact time of the peptide solution with the surface. The coated EAK16-II nanofibers alter the wettability of the two surfaces differently: the water contact angle of bare mica surface is measured to be <10°, while it increases to 20.3±2.9° upon 2 h modification of the surface using a 29 µM EAK16-II solution. In contrast, the water contact angle decreases significantly from 71.2±11.1° to 39.4±4.3° after the HOPG surface is coated with a 29 µM peptide solution for 2 h. The stability of the EAK16-II nanofibers on both surfaces is further evaluated by immersing the surface into acidic and basic solutions and analyzing the changes in the nanofiber surface coverage. The EAK16-II nanofibers on mica remain stable in acidic solution but not in alkaline solution, while they are stable on the HOPG surface regardless of the solution pH. This work demonstrates the possibility of using self-assembling peptides for surface modification applications.
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Affiliation(s)
- Hong Yang
- Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, Canada
| | - Shan-Yu Fung
- Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, Canada
| | - Mark Pritzker
- Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, Canada
- * To whom correspondence should be addressed. E-mail: (MP); (PC)
| | - P. Chen
- Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, Canada
- * To whom correspondence should be addressed. E-mail: (MP); (PC)
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Jain R, Von Recum AF. Fibroblast attachment to smooth and microtextured PET and thin cp-Ti films. J Biomed Mater Res A 2004; 68:296-304. [PMID: 14704971 DOI: 10.1002/jbm.a.20045] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Improving the biological performance of engineered implants apposing interfacing tissues is a critical issue in Biomaterials Science and Engineering. Micromotion at the soft tissue-implant interface has been shown to sustain an inflammatory response. To eliminate micromotion, it is desirable to promote cellular and extracellular matrix adhesion to the implant surface. Surfaces are modified topographically or chemically to effect cellular adhesion and to influence cellular interactions and function. Previous studies have identified the specific topographical characteristics that appear to elicit cellular attachment. This in vitro study compares the independent effects of surface chemistry and topography on fibroblast-test specimen proximity. Titanium (Ti) was sputter-coated in stepwise, increasing thickness (20-350 nm) onto a series of either smooth or microtextured polyethylene terephthalate (PET), resulting in a stepwise change from a PET surface to a Ti surface. The series was evaluated in a 3-day fibroblast culture with transmission electron microscopy (TEM) for cell-test specimen proximity. Fibroblast proximity to the coverslip surface increases, as the Ti thickness increases, on either smooth or textured test specimens. Furthermore, fibroblasts were firmly attached to the ridge tops on the coated textured test specimens. Therefore, fibroblast apposition is strongly enhanced by microtextured surfaces and Ti rather than smooth surfaces and PET.
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Affiliation(s)
- Rakhi Jain
- The Ohio State University, Biomedical Engineering Center of the College of Engineering and the College of Medicine & Public Health, 270 Bevis Hall, 1080 Carmack Road, Columbus, Ohio 43220, USA
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26
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Puskas JE, Chen Y. Biomedical Application of Commercial Polymers and Novel Polyisobutylene-Based Thermoplastic Elastomers for Soft Tissue Replacement†. Biomacromolecules 2004; 5:1141-54. [PMID: 15244424 DOI: 10.1021/bm034513k] [Citation(s) in RCA: 212] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Novel polyisobutylene-based thermoplastic elastomers are introduced as prospective implant materials for soft tissue replacement and reconstruction. In comparison, poly(ethylene terephthalate) (PET), poly(tetrafluoroethylene) (PTFE), polypropylene (PP), polyurethanes (PU), and silicones are outlined from well-established implant history as being relatively inert and biocompatible biomaterials for soft tissue replacement, especially in vascular grafts and breast implants. Some general considerations for the design and development of polymers for soft tissue replacement are reviewed from the viewpoint of material science and engineering, with special attention to synthetic materials used in vascular grafts and breast implants.
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Affiliation(s)
- Judit E Puskas
- Department of Chemical & Biochemical Engineering, The University of Western Ontario, London, Ontario, Canada N6A 5B9
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27
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Sakurai T, Mizokami H, Furukawa S, Sakata M, Kunitake M, Hirayama C, Ihara H. Effect of surface structure on cell growth prepared by the terminal immobilization method. J Appl Polym Sci 2004. [DOI: 10.1002/app.13501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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28
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Hersel U, Dahmen C, Kessler H. RGD modified polymers: biomaterials for stimulated cell adhesion and beyond. Biomaterials 2003; 24:4385-415. [PMID: 12922151 DOI: 10.1016/s0142-9612(03)00343-0] [Citation(s) in RCA: 1731] [Impact Index Per Article: 82.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Since RGD peptides (R: arginine; G: glycine; D: aspartic acid) have been found to promote cell adhesion in 1984 (Cell attachment activity of fibronectin can be duplicated by small synthetic fragments of the molecule, Nature 309 (1984) 30), numerous materials have been RGD functionalized for academic studies or medical applications. This review gives an overview of RGD modified polymers, that have been used for cell adhesion, and provides information about technical aspects of RGD immobilization on polymers. The impacts of RGD peptide surface density, spatial arrangement as well as integrin affinity and selectivity on cell responses like adhesion and migration are discussed.
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Affiliation(s)
- Ulrich Hersel
- Institut für Organische Chemie und Biochemie, Technische Universität München, Lichtenbergstr. 4, D-85747, Garching, Germany
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29
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Hyung Park J, Bae YH. Hydrogels based on poly(ethylene oxide) and poly(tetramethylene oxide) or poly(dimethyl siloxane). III. In vivo biocompatibility and biostability. J Biomed Mater Res A 2003; 64:309-19. [PMID: 12522818 DOI: 10.1002/jbm.a.10424] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
To investigate the effects of polymer chemistry and topology (linear or graft copolymer) on in vivo biocompatibility and biostability based on cage implant system, various hydrogels, composed of short hydrophilic [polyethylene oxide (PEO)] and hydrophobic block, were prepared by polycondensation reaction. Poly(tetramethylene oxide) (PTMO) or poly(dimethyl siloxane) (PDMS) was chosen as a hydrophobic block because of their wide utilization as a biomaterial. By using the specimens retrieved from rats killed after 1, 2, 3, 5, and 7 weeks' implantation, cellular and material responses were assessed. Most hydrogels showed a comparable value of macrophage density to Pellethane(R), control polymer, whereas they did significantly lower foreign body giant cell (FBGC) density and coverage because of the presence of PEO. However, PEO block length and polymer topology did not affect macrophage adhesion and FBGC formation in our polymer composition. The hydrogel based on PDMS alone showed significantly lower macrophage density and FBGC density than Pellethane(R), indicating that PDMS plays a role in inhibiting cellular adhesion. The results obtained from gel permeation chromatography curve and Fourier transform infrared spectra exhibited that all the polymers were susceptible to oxidative degradation in vivo. Although Pellethane(R) revealed surface degradation by 5 weeks in vivo, hydrogels showed rapid degradation in the bulk within 2 weeks because of the penetration of oxidative chemicals released from phagocytic cells into PEO domain of phase-separated hydrogels. The more significant degradation was observed in the hydrogels with longer PEO block and PTMO as a hydrophobic block instead of PDMS. It was evident that the minor degradation could be achieved by grafting PEO and adopting PDMS as a hydrophobic block in the hydrogel.
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Affiliation(s)
- Jae Hyung Park
- Center for Biomaterials and Biotechnology, Department of Materials Science and Engineering, Kwangju Institute of Science and Technology, 1 Oryong-dong, Puk-gu, Kwangju 500-712, South Korea
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30
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Gu YJ, Cui WX, Miyamoto M, Kawakami Y, Xu BY, Balamurugan AN, Nagata N, Morimoto Y, Imamura M, Satake A, Iwata H, Nozawa M, Inoue K. Development of a new bioartificial pancreas possessing angiogenesis-inducing function. Transplant Proc 2000; 32:2475. [PMID: 11120252 DOI: 10.1016/s0041-1345(00)01751-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Y J Gu
- Department of Organ Reconstruction, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
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31
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Gu YJ, Miyamoto M, Cui WX, Xu BY, Kawakami Y, Yamasaki T, Setoyama H, Kinosita N, Iwata H, Ikada Y, Imamura M, Inoue K. Effect of neovascularization-inducing bioartificial pancreas on survival of syngeneic islet grafts. Transplant Proc 2000; 32:2494-5. [PMID: 11120263 DOI: 10.1016/s0041-1345(00)01763-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Y J Gu
- Institute for Frontier Medical Sciences, Department of Organ Reconstruction, Kyoto University, Kyoto, Japan
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Pakalns T, Haverstick KL, Fields GB, McCarthy JB, Mooradian DL, Tirrell M. Cellular recognition of synthetic peptide amphiphiles in self-assembled monolayer films. Biomaterials 1999; 20:2265-79. [PMID: 10614933 DOI: 10.1016/s0142-9612(99)00157-x] [Citation(s) in RCA: 117] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The incorporation of lipidated cell adhesion peptides into self-assembled structures such as films provides the opportunity to develop unique biomimetic materials with well-organized interfaces. Synthetic dialkyl tails have been linked to the amino-terminus, carboxyl-terminus, and both termini of the cell recognition sequence Arg-Gly-Asp (RGD) to produce amino-coupled, carboxyl-coupled, and looped RGD peptide amphiphiles. All three amphiphilic RGD versions self-assembled into fairly stable mixed monolayers that deposited well as Langmuir-Blodgett films on surfaces, except for films containing amino-coupled RGD amphiphiles at high peptide concentrations. FT-IR studies showed that amino-coupled RGD head groups formed the strongest lateral hydrogen bonds. Melanoma cells spread on looped RGD amphiphiles in a concentration-dependent manner, spread indiscriminately on carboxyl-coupled RGD amphiphiles, and did not spread on amino-coupled RGD amphiphiles. Looped RGD amphiphiles promoted the adhesion, spreading, and cytoskeletal reorganization of melanoma and endothelial cells while control looped Arg-Gly-Glu (RGE) amphiphiles inhibited them. Antibody inhibition of the integrin receptor alpha3beta1 blocked melanoma cell adhesion to looped RGD amphiphiles. These results confirm that novel biomolecular materials containing synthetic peptide amphiphiles have the potential to control cellular behavior in a specific manner.
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Affiliation(s)
- T Pakalns
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis 55455, USA
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Abramson S, Alexander H, Best S, Bokros J, Brunski JB, Colas A, Cooper SL, Curtis J, Haubold A, Hench LL, Hergenrother RW, Hoffman AS, Hubbell JA, Jansen JA, King MW, Kohn J, Lamba NM, Langer R, Migliaresi C, More RB, Peppas NA, Ratner BD, Visser SA, Recum AV, Weinberg S, Yannas IV. Classes of Materials Used in Medicine. Biomater Sci 1996. [DOI: 10.1016/b978-012582460-6/50005-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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