1
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Mendrek B, Oleszko-Torbus N, Teper P, Kowalczuk A. Towards a modern generation of polymer surfaces: nano- and microlayers of star macromolecules and their design for applications in biology and medicine. Prog Polym Sci 2023. [DOI: 10.1016/j.progpolymsci.2023.101657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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2
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Poly(2-Methoxyethyl Acrylate) (PMEA)-Coated Anti-Platelet Adhesive Surfaces to Mimic Native Blood Vessels through HUVECs Attachment, Migration, and Monolayer Formation. COATINGS 2022. [DOI: 10.3390/coatings12060869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Confluent monolayers of human umbilical vein endothelial cells (HUVECs) on a poly(2-methoxyethyl acrylate) (PMEA) antithrombogenic surface play a major role in mimicking the inner surface of native blood vessels. In this study, we extensively investigated the behavior of cell–polymer and cell–cell interactions by measuring adhesion strength using single-cell force spectroscopy. In addition, the attachment and migration of HUVECs on PMEA-analogous substrates were detected, and the migration rate was estimated. Moreover, the bilateral migration of HUVECs between two adjacent surfaces was observed. Furthermore, the outer surface of HUVEC was examined using frequency-modulation atomic force microscopy (FM-AFM). Hydration was found to be an indication of a healthy glycocalyx layer. The results were compared with the hydration states of individual PMEA-analogous polymers to understand the adhesion mechanism between the cells and substrates in the interface region. HUVECs could attach and spread on the PMEA surface with stronger adhesion strength than self-adhesion strength, and migration occurred over the surface of analogue polymers. We confirmed that platelets could not adhere to HUVEC monolayers cultured on the PMEA surface. FM-AFM images revealed a hydration layer on the HUVEC surfaces, indicating the presence of components of the glycocalyx layer in the presence of intermediate water. Our findings show that PMEA can mimic original blood vessels through an antithrombogenic HUVEC monolayer and is thus suitable for the construction of artificial small-diameter blood vessels.
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3
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Zhang M, Chan CHH, Pauls JP, Semenzin C, Ainola C, Peng H, Fu C, Whittaker AK, Heinsar S, Fraser JF. Investigation of heparin-loaded poly(ethylene glycol)-based hydrogels as anti-thrombogenic surface coatings for extracorporeal membrane oxygenation. J Mater Chem B 2022; 10:4974-4983. [PMID: 35695541 DOI: 10.1039/d2tb00379a] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Extracorporeal membrane oxygenation (ECMO), a critical life-sustaining tool, faces significant challenges for the maintenance of normal haemostasis due to the large volume of circulating blood continuously in contact with artificial surfaces, hyperoxia and excessive shear stresses of the extracorporeal circuit. From a biomaterials perspective, it has been hypothesised that drug eluting coatings composed of haemocompatible hydrogels loaded with an anticoagulant drug could potentially enhance the haemocompatibility of the circuit. Poly(ethylene glycol) (PEG) has been well established as a biocompatible and anti-fouling material with wide biomedical application. Unfractionated heparin is the most commonly used anticoagulant for ECMO. In the present study, the feasibility of using heparin-loaded PEG-based hydrogels as anti-thrombogenic surface coatings for ECMO was investigated. The hydrogels were synthesised by photopolymerisation using poly(ethylene glycol) diacrylate (PEGDA) as the crosslinking monomer and poly(ethylene glycol) methacrylate (PEGMA) as the hydrophilic monomer, with heparin loaded into the pre-gel solution. Factors which could affect the release of heparin were investigated, including the ratio of PEGDA/PEGMA, water content, loading level of heparin and the flow of fluid past the hydrogel. Our results showed that increased crosslinker content and decreased water content led to slower heparin release. The hydrogels with water contents of 60 wt% and 70 wt% could achieve a sustained heparin release by adjusting the ratio of PEGDA/PEGMA. The anticoagulation efficacy of the released heparin was evaluated by measuring the activated clotting time of whole blood. The hydrogels with desirable heparin release profiles were prepared onto poly(4-methyl-1-pentene) (PMP) films with the same chemical composition as the PMP ECMO membranes. The coatings showed sustained heparin release with a cumulative release of 70-80% after 7 days. Haemocompatibility tests demonstrated that PEG hydrogel coatings significantly reduced platelet adhesion and prolonged plasma recalcification time. These results suggest that heparin-loaded PEG hydrogels are potential anti-thrombogenic coatings for ECMO.
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Affiliation(s)
- Meili Zhang
- Innovative Cardiovascular Engineering and Technology Laboratory, Critical Care Research Group, The Prince Charles Hospital, QLD, Australia. .,School of Mechanical and Mining Engineering, The University of Queensland, QLD, Australia
| | - Chris H H Chan
- Innovative Cardiovascular Engineering and Technology Laboratory, Critical Care Research Group, The Prince Charles Hospital, QLD, Australia. .,School of Engineering and Built Environment, Griffith University, QLD, Australia
| | - Jo P Pauls
- Innovative Cardiovascular Engineering and Technology Laboratory, Critical Care Research Group, The Prince Charles Hospital, QLD, Australia. .,School of Engineering and Built Environment, Griffith University, QLD, Australia
| | - Clayton Semenzin
- Innovative Cardiovascular Engineering and Technology Laboratory, Critical Care Research Group, The Prince Charles Hospital, QLD, Australia. .,School of Engineering and Built Environment, Griffith University, QLD, Australia
| | - Carmen Ainola
- Scientific and Translational Research Laboratory, Critical Care Research Group, The Prince Charles Hospital, QLD, Australia.,Faculty of Medicine, The University of Queensland, QLD, Australia
| | - Hui Peng
- Australian Institute for Bioengineering and Nanotechnology and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of Queensland, QLD, Australia
| | - Changkui Fu
- Australian Institute for Bioengineering and Nanotechnology and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of Queensland, QLD, Australia
| | - Andrew K Whittaker
- Australian Institute for Bioengineering and Nanotechnology and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of Queensland, QLD, Australia
| | - Silver Heinsar
- Scientific and Translational Research Laboratory, Critical Care Research Group, The Prince Charles Hospital, QLD, Australia.,Faculty of Medicine, The University of Queensland, QLD, Australia
| | - John F Fraser
- Innovative Cardiovascular Engineering and Technology Laboratory, Critical Care Research Group, The Prince Charles Hospital, QLD, Australia. .,Scientific and Translational Research Laboratory, Critical Care Research Group, The Prince Charles Hospital, QLD, Australia.,Faculty of Medicine, The University of Queensland, QLD, Australia.,School of Medicine, Griffith University, QLD, Australia
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4
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Using Graphene-Based Materials for Stiff and Strong Poly(ethylene glycol) Hydrogels. Int J Mol Sci 2022; 23:ijms23042312. [PMID: 35216431 PMCID: PMC8880715 DOI: 10.3390/ijms23042312] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 02/04/2022] [Accepted: 02/10/2022] [Indexed: 11/17/2022] Open
Abstract
Blood-contacting devices are increasingly important for the management of cardiovascular diseases. Poly(ethylene glycol) (PEG) hydrogels represent one of the most explored hydrogels to date. However, they are mechanically weak, which prevents their use in load-bearing biomedical applications (e.g., vascular grafts, cardiac valves). Graphene and its derivatives, which have outstanding mechanical properties, a very high specific surface area, and good compatibility with many polymer matrices, are promising candidates to solve this challenge. In this work, we propose the use of graphene-based materials as nanofillers for mechanical reinforcement of PEG hydrogels, and we obtain composites that are stiffer and stronger than, and as anti-adhesive as, neat PEG hydrogels. Results show that single-layer and few-layer graphene oxide can strengthen PEG hydrogels, increasing their stiffness up to 6-fold and their strength 14-fold upon incorporation of 4% w/v (40 mg/mL) graphene oxide. The composites are cytocompatible and remain anti-adhesive towards endothelial cells, human platelets and Staphylococcus aureus, similar to neat hydrogels. To the best of our knowledge, this is the first work to report such an increase of the tensile properties of PEG hydrogels using graphene-based materials as fillers. This work paves the way for the exploitation of PEG hydrogels as a backbone material for load-bearing applications.
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5
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Dituri F, Centonze M, Berenschot EJW, Tas NR, Susarrey-Arce A, Krol S. Complex Tumor Spheroid Formation and One-Step Cancer-Associated Fibroblasts Purification from Hepatocellular Carcinoma Tissue Promoted by Inorganic Surface Topography. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:3233. [PMID: 34947582 PMCID: PMC8706479 DOI: 10.3390/nano11123233] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 11/24/2021] [Accepted: 11/26/2021] [Indexed: 12/12/2022]
Abstract
In vitro cell models play important roles as testbeds for toxicity studies, drug development, or as replacements in animal experiments. In particular, complex tumor models such as hepatocellular carcinoma (HCC) are needed to predict drug efficacy and facilitate translation into clinical practice. In this work, topographical features of amorphous silicon dioxide (SiO2) are fabricated and tested for cell culture of primary HCC cells and cell lines. The topographies vary from pyramids to octahedrons to structures named fractals, with increased hierarchy and organized in periodic arrays (square or Hexagonal). The pyramids were found to promote complex 2D/3D tissue formation from primary HCC cells. It was found that the 2D layer was mainly composed of cancer-associated fibroblasts (CAFs), while the 3D spheroids were composed of tumor cells enwrapped by a CAF layer. Compared with conventional protocols for 3D cultures, this novel approach mimics the 2D/3D complexity of the original tumor by invading CAFs and a microtumor. Topographies such as octahedrons and fractals exclude tumor cells and allow one-step isolation of CAFs even directly from tumor tissue of patients as the CAFs migrate into the structured substrate. Cell lines form spheroids within a short time. The presented inorganic topographical surfaces stimulate complex spheroid formation while avoiding additional biological scaffolds and allowing direct visualization on the substrate.
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Affiliation(s)
- Francesco Dituri
- Laboratory for Personalized Medicine, National Institute of Gastroenterology, “S. de Bellis” Research Hospital, Castellana Grotte Via Turi 27, 70013 Bari, Italy; (F.D.); (M.C.)
| | - Matteo Centonze
- Laboratory for Personalized Medicine, National Institute of Gastroenterology, “S. de Bellis” Research Hospital, Castellana Grotte Via Turi 27, 70013 Bari, Italy; (F.D.); (M.C.)
| | - Erwin J. W. Berenschot
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands; (E.J.W.B.); (N.R.T.)
| | - Niels R. Tas
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands; (E.J.W.B.); (N.R.T.)
| | - Arturo Susarrey-Arce
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands; (E.J.W.B.); (N.R.T.)
| | - Silke Krol
- Laboratory for Personalized Medicine, National Institute of Gastroenterology, “S. de Bellis” Research Hospital, Castellana Grotte Via Turi 27, 70013 Bari, Italy; (F.D.); (M.C.)
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6
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Serrati S, Martinelli C, Palazzo A, Iacobazzi RM, Perrone M, Ong QK, Luo Z, Bekdemir A, Pinto G, Cavalleri O, Cutrignelli A, Laquintana V, Denora N, Stellacci F, Krol S. Reproducibility warning: The curious case of polyethylene glycol 6000 and spheroid cell culture. PLoS One 2020; 15:e0224002. [PMID: 32191706 PMCID: PMC7082040 DOI: 10.1371/journal.pone.0224002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Accepted: 03/02/2020] [Indexed: 12/31/2022] Open
Abstract
Reproducibility of results is essential for a well-designed and conducted experiment. Several reasons may originate failure in reproducing data, such as selective reporting, low statistical power, or poor analysis. In this study, we used PEG6000 samples from different distributors and tested their capability inducing spheroid formation upon surface coating. MALDI-MS, NMR, FTIR, and Triple SEC analysis of the different PEG60000s showed nearly identical physicochemical properties different, with only minor differences in mass and hydrodynamic radius, and AFM analysis showed no significant differences in the surface coatings obtained with the available PEG6000s. Despite these similarities, just one showed a highly reproducible formation of spheroids with different cell lines, such as HT-29, HeLa, Caco2, and PANC-1. Using the peculiar PEG6000 sample and a reference PEG6000 chosen amongst the others as control, we tested the effect of the cell/PEG interaction by incubating cells in the PEG solution prior to cell plating. These experiments indicate that the spheroid formation is due to direct interaction of the polymer with the cells rather than by interaction of cells with the coated surfaces. The experiments point out that for biological entities, such as cells or tissues, even very small differences in impurities or minimal variations in the starting product can have a very strong impact on the reproducibility of data.
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Affiliation(s)
- Simona Serrati
- Nanotechnology Laboratory, IRCCS Istituto Tumori "Giovanni Paolo II", Bari, Italy
| | | | - Antonio Palazzo
- Nanotechnology Laboratory, IRCCS Istituto Tumori "Giovanni Paolo II", Bari, Italy
| | - Rosa Maria Iacobazzi
- Experimental Pharmacology Laboratory, IRCCS Istituto Tumori "Giovanni Paolo II", Bari, Italy
| | - Mara Perrone
- Nanotechnology Laboratory, IRCCS Istituto Tumori "Giovanni Paolo II", Bari, Italy
| | - Quy K. Ong
- Institute of Materials, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland
| | - Zhi Luo
- Institute of Materials, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland
| | - Ahmet Bekdemir
- Institute of Materials, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland
| | - Giulia Pinto
- Department of Physics, University of Genoa, Genoa, Italy
| | | | - Annalisa Cutrignelli
- Department of Pharmacy- Pharmaceutical Sciences, University of Bari "Aldo Moro", Bari, Italy
| | - Valentino Laquintana
- Department of Pharmacy- Pharmaceutical Sciences, University of Bari "Aldo Moro", Bari, Italy
| | - Nunzio Denora
- Department of Pharmacy- Pharmaceutical Sciences, University of Bari "Aldo Moro", Bari, Italy
| | - Francesco Stellacci
- Institute of Materials, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland
- Interfaculty Bioengineering Institute, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Silke Krol
- Laboratory for personalized medicine, National Institute of Gastroenterology IRCCS "S. de Bellis" Research Hospital, Castellana Grotte, Bari, Italy
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7
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Roseen MA, Fahrenholtz MM, Connell JP, Grande-Allen KJ. Interfacial Coating Method for Amine-Rich Surfaces using Poly(ethylene glycol) Diacrylate Applied to Bioprosthetic Valve Tissue Models. ACS APPLIED BIO MATERIALS 2020; 3:1321-1330. [PMID: 35021626 DOI: 10.1021/acsabm.9b00911] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Bioprosthetic heart valve implants are beset by calcification and failure due to the interactions between the body and the transplant. Hydrogels can be used as biological blank slates that may help to shield implants from these interactions; however, traditional light-based hydrogel polymerization is impeded by tissue opacity and topography. Therefore, new methods must be created to bind hydrogel to implant tissues. To address these complications, a two-step surface-coating method for bioprosthetic valves was developed. A previously developed bioprosthetic valve model (VM) was used to investigate and optimize the coating method. Generally, this coating is achieved by first reacting surface amine groups with an NHS-PEG-acrylate while also allowing glucose to absorb into the bulk. Then, glucose oxidase, poly(ethylene glycol) diacrylate (PEGDA), and iron ions are added to the system to initiate free-radical polymerization that bonds the PEGDA hydrogel to the acrylates sites on the surface. Results showed a thin (∼8 μm), continuous coating on VM samples that is capable of repelling protein adhesion (2% surface fouling versus 20% on uncoated samples) and does not significantly affect the surface mechanical properties. Based on this success, the coating method was translated to glutaraldehyde-fixed valve tissue samples. Results showed noncontinuous but evident coating on the surface, which was further improved by adjusting the coating solution. These results demonstrate the feasibility of the proposed two-step surface coating method for modifying the surface of bioprosthetic valve replacements.
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Affiliation(s)
- Madeleine A Roseen
- Rice University, Department of Bioengineering, 6100 Main St, Houston, Texas 77035, United States
| | - Monica M Fahrenholtz
- Rice University, Department of Bioengineering, 6100 Main St, Houston, Texas 77035, United States.,Texas Children's Hospital, Department of Surgery, 6621 Fannin St, Houston, Texas 77030, United States
| | - Jennifer P Connell
- Rice University, Department of Bioengineering, 6100 Main St, Houston, Texas 77035, United States
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8
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Martin G, Lübke J, Schefold S, Jordan JF, Schlunck G, Reinhard T, Kanokwijitsilp T, Prucker O, Rühe J, Anton A. Prevention of Ocular Tenon Adhesion to Sclera by a PDMAA Polymer to Improve Results after Glaucoma Surgery. Macromol Rapid Commun 2020; 41:e1900352. [DOI: 10.1002/marc.201900352] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 10/17/2019] [Indexed: 01/01/2023]
Affiliation(s)
- Gottfried Martin
- Eye CenterMedical Center ‐ Faculty of MedicineUniversity of Freiburg Killianstraße 5 79106 Freiburg Germany
| | - Jan Lübke
- Eye CenterMedical Center ‐ Faculty of MedicineUniversity of Freiburg Killianstraße 5 79106 Freiburg Germany
| | - Suzanna Schefold
- Eye CenterMedical Center ‐ Faculty of MedicineUniversity of Freiburg Killianstraße 5 79106 Freiburg Germany
- Department of Microsystems Engineering (IMTEK)University of Freiburg Georges‐Köhler‐Allee 103 79110 Freiburg Germany
| | - Jens F. Jordan
- Eye CenterMedical Center ‐ Faculty of MedicineUniversity of Freiburg Killianstraße 5 79106 Freiburg Germany
- Praxisausübungsgemeinschaft Vobig & Jordan Hans‐Thoma‐Straße 24 60596 Frankfurt Germany
| | - Günther Schlunck
- Eye CenterMedical Center ‐ Faculty of MedicineUniversity of Freiburg Killianstraße 5 79106 Freiburg Germany
| | - Thomas Reinhard
- Eye CenterMedical Center ‐ Faculty of MedicineUniversity of Freiburg Killianstraße 5 79106 Freiburg Germany
| | - Thananthorn Kanokwijitsilp
- Department of Microsystems Engineering (IMTEK)University of Freiburg Georges‐Köhler‐Allee 103 79110 Freiburg Germany
| | - Oswald Prucker
- Department of Microsystems Engineering (IMTEK)University of Freiburg Georges‐Köhler‐Allee 103 79110 Freiburg Germany
| | - Jürgen Rühe
- Department of Microsystems Engineering (IMTEK)University of Freiburg Georges‐Köhler‐Allee 103 79110 Freiburg Germany
| | - Alexandra Anton
- Eye CenterMedical Center ‐ Faculty of MedicineUniversity of Freiburg Killianstraße 5 79106 Freiburg Germany
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9
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Surface-attached dual-functional hydrogel for controlled cell adhesion based on poly(N,N-dimethylacrylamide). JOURNAL OF POLYMER RESEARCH 2019. [DOI: 10.1007/s10965-019-1728-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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10
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Development of surface-attached thin film of non-fouling hydrogel from poly(2-oxazoline). JOURNAL OF POLYMER RESEARCH 2019. [DOI: 10.1007/s10965-018-1677-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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11
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Bai L, Zhao J, Li Q, Guo J, Ren X, Xia S, Zhang W, Feng Y. Biofunctionalized Electrospun PCL‐PIBMD/SF Vascular Grafts with PEG and Cell‐Adhesive Peptides for Endothelialization. Macromol Biosci 2018; 19:e1800386. [DOI: 10.1002/mabi.201800386] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 11/08/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Lingchuang Bai
- School of Chemical Engineering and TechnologyTianjin University Yaguan Road 135 Tianjin 300350 China
| | - Jing Zhao
- School of Chemical Engineering and TechnologyTianjin University Yaguan Road 135 Tianjin 300350 China
| | - Qian Li
- School of Chemical Engineering and TechnologyTianjin University Yaguan Road 135 Tianjin 300350 China
| | - Jintang Guo
- School of Chemical Engineering and TechnologyTianjin University Yaguan Road 135 Tianjin 300350 China
- Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin) Tianjin 300350 China
| | - Xiangkui Ren
- School of Chemical Engineering and TechnologyTianjin University Yaguan Road 135 Tianjin 300350 China
- Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin) Tianjin 300350 China
- Key Laboratory of Systems Bioengineering (Ministry of Education)Tianjin University Tianjin 300072 China
| | - Shihai Xia
- Department of Hepatopancreatobiliary and Splenic MedicineAffiliated HospitalLogistics University of People's Armed Police Force 220 Chenglin Road Tianjin 300162 China
| | - Wencheng Zhang
- Department of Physiology and PathophysiologyLogistics University of Chinese People's Armed Police Force Tianjin 300309 China
| | - Yakai Feng
- School of Chemical Engineering and TechnologyTianjin University Yaguan Road 135 Tianjin 300350 China
- Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin) Tianjin 300350 China
- Key Laboratory of Systems Bioengineering (Ministry of Education)Tianjin University Tianjin 300072 China
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12
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Trützschler AK, Bus T, Sahn M, Traeger A, Weber C, Schubert US. The Power of Shielding: Low Toxicity and High Transfection Performance of Cationic Graft Copolymers Containing Poly(2-oxazoline) Side Chains. Biomacromolecules 2018; 19:2759-2771. [PMID: 29791802 DOI: 10.1021/acs.biomac.8b00362] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We show the potential of oligo(2-ethyl-2-oxazoline) (Oxn)-shielded graft copolymers of (2-aminoethyl)-methacrylate and N-methyl-(2-aminoethyl)-methacrylate for pDNA delivery in HEK cells. For the effect of grafting density and side chain length concerning improved transfection properties through the concept of shielding to be investigated, copolymers were synthesized via the macromonomer method using a combination of cationic ring opening polymerization and reversible addition-fragmentation chain transfer polymerization to vary the degree of grafting (DG = 10 and 30%) as well as the side chain degree of polymerization (DP = 5 and 20). Investigations of the polyplex formation, in vitro flow cytometry, and confocal laser scanning microscopy measurements on the copolymer library revealed classical shielding properties of the Ox side chains, including highly reduced cytotoxicity and a partial decrease in transfection efficiency, as also reported for polyethylene glycol shielding. In terms of the transfection efficiency, the best performing copolymers (A- g-Ox5(10) and M- g-Ox5(10)) revealed equal or better performances compared to those of the corresponding homopolymers. In particular, the graft copolymers with low DG and side chain DP transfected well with over 10-fold higher IC50 values. In contrast, a DG of 30% resulted in a loss of transfection efficiency due to missing ability for endosomal release, and a side chain DP of 20 hampered the cellular uptake.
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Affiliation(s)
- Anne-Kristin Trützschler
- Laboratory of Organic and Macromolecular Chemistry (IOMC) , Friedrich Schiller University Jena , Humboldtstrasse 10 , 07743 Jena , Germany.,Jena Center for Soft Matter (JCSM) , Friedrich Schiller University Jena , Philosophenweg 7 , 07743 Jena , Germany
| | - Tanja Bus
- Laboratory of Organic and Macromolecular Chemistry (IOMC) , Friedrich Schiller University Jena , Humboldtstrasse 10 , 07743 Jena , Germany.,Jena Center for Soft Matter (JCSM) , Friedrich Schiller University Jena , Philosophenweg 7 , 07743 Jena , Germany
| | - Martin Sahn
- Laboratory of Organic and Macromolecular Chemistry (IOMC) , Friedrich Schiller University Jena , Humboldtstrasse 10 , 07743 Jena , Germany.,Jena Center for Soft Matter (JCSM) , Friedrich Schiller University Jena , Philosophenweg 7 , 07743 Jena , Germany
| | - Anja Traeger
- Laboratory of Organic and Macromolecular Chemistry (IOMC) , Friedrich Schiller University Jena , Humboldtstrasse 10 , 07743 Jena , Germany.,Jena Center for Soft Matter (JCSM) , Friedrich Schiller University Jena , Philosophenweg 7 , 07743 Jena , Germany
| | - Christine Weber
- Laboratory of Organic and Macromolecular Chemistry (IOMC) , Friedrich Schiller University Jena , Humboldtstrasse 10 , 07743 Jena , Germany.,Jena Center for Soft Matter (JCSM) , Friedrich Schiller University Jena , Philosophenweg 7 , 07743 Jena , Germany
| | - Ulrich S Schubert
- Laboratory of Organic and Macromolecular Chemistry (IOMC) , Friedrich Schiller University Jena , Humboldtstrasse 10 , 07743 Jena , Germany.,Jena Center for Soft Matter (JCSM) , Friedrich Schiller University Jena , Philosophenweg 7 , 07743 Jena , Germany
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13
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Groll JÜRGEN, Fiedler JÖRG, Bruellhoff K, Moeller M, Brenner RE. Novel Surface Coatings Modulating Eukaryotic Cell Adhesion and Preventing Implant Infection. Int J Artif Organs 2018; 32:655-62. [DOI: 10.1177/039139880903200915] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Poor osseointegration and bacterial infection are major causes of orthopedic implant failure. Both problems arise from passive unspecific protein coating that may not optimally support adhesion of osteoblastic cells and which enable bacterial adhesion that subsequently results in biofilm formation. This review addresses emerging concepts of preventing unspecific protein adsorption and biofilm formation by organic coating systems. We especially focus on recent concepts that additionally allow functionalization for preferential cell adhesion using cell adhesion mediating small peptide sequences that do not induce bacterial adherence. One promising approach that is presented and discussed within this context is the use of NCO-sP(EO-stat-PO).
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Affiliation(s)
- JÜRGEN Groll
- DWI e.V. and Institute of Technical and Macromolecular Chemistry, RWTH Aachen, Aachen - Germany
| | - JÖRG Fiedler
- Department of Orthopedics, Division for Biochemistry of Joint and Connective Tissue Diseases, University of Ulm, Ulm - Germany
| | - Kristina Bruellhoff
- DWI e.V. and Institute of Technical and Macromolecular Chemistry, RWTH Aachen, Aachen - Germany
| | - Martin Moeller
- DWI e.V. and Institute of Technical and Macromolecular Chemistry, RWTH Aachen, Aachen - Germany
| | - Rolf E. Brenner
- Department of Orthopedics, Division for Biochemistry of Joint and Connective Tissue Diseases, University of Ulm, Ulm - Germany
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14
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Regulation of macrophage polarization and promotion of endothelialization by NO generating and PEG-YIGSR modified vascular graft. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017. [PMID: 29519417 DOI: 10.1016/j.msec.2017.11.005] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
As an effective clinic treatment for cardiovascular disease, vascular transplantation gains much acceptance recently. However, due to the acute thrombosis and intimal hyperplasia, long-term failure of synthetic grafts after implanted in small diameter blood vessel decelerates its commercial use. The continued acute inflammation and delayed endothelialization have been considered as fundamental reasons. To enhance the adhesion and organization of endothelial cells (ECs) and improve the vascular remodeling process, we have constructed a vascular graft based on electrospun polycaprolactone (PCL) matrix, on which organoselenium-immobilized polyethyleneimine (SePEI) for in situ nitric oxide (NO) generation and hyaluronic acid (HA) grafted with poly (ethylene glycol) (PEG) modified Tyr-Ile-Gly-Ser-Arg (YIGSR) for antifouling and EC adhesion were deposited through electrostatic layer-by-layer assembly. The in vitro results showed that SePEI deposited on the grafts could catalyze stable generation of NO. After in situ implantation in rats for 4 and 8weeks, the graft promoted the transformation of macrophages into an anti-inflammatory phenotype (M2), which helped endothelium remodeling. YIGSR on the outmost layer facilitated more rapid and organized EC adhesion compared to PCL and non-modified grafts. PEG polymer chain on the outmost layer mitigated nonspecific adsorption of undesirable blood components. In our study, we first demonstrated the regulation of macrophage polarization by an NO-generating vascular graft. The results indicated that the approach of anti-inflammatory macrophage polarization and enhanced endothelialization through NO generation and PEG-modified YIGSR in our study may provide a new perspective for the clinic application of cell-free small-diameter vascular grafts.
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Li J, Zhang K, Huang N. Engineering Cardiovascular Implant Surfaces to Create a Vascular Endothelial Growth Microenvironment. Biotechnol J 2017; 12. [PMID: 28941232 DOI: 10.1002/biot.201600401] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Revised: 09/14/2017] [Indexed: 12/16/2022]
Abstract
Cardiovascular disease (CVD) is generally accepted as the leading cause of morbidity and mortality worldwide, and an increasing number of patients suffer from atherosclerosis and thrombosis annually. To treat these disorders and prolong the sufferers' life, several cardiovascular implants have been developed and applied clinically. Nevertheless, thrombosis and hyperplasia at the site of cardiovascular implants are recognized as long-term problems in the practice of interventional cardiology. Here, we start this review from the clinical requirement of the implants, such as anti-hyperplasia, anti-thrombosis, and pro-endothelialization, wherein particularly focus on the natural factors which influence functional endothelialization in situ, including the healthy smooth muscle cells (SMCs) environment, blood flow shear stress (BFSS), and the extracellular matrix (ECM) microenvironment. Then, the currently available strategies on surface modification of cardiovascular biomaterials to create vascular endothelial growth microenvironment are introduced as the main topic, e.g., BFSS effect simulation by surface micro-patterning, ECM rational construction and SMCs phenotype maintain. Finally, the prospects for extending use of the in situ construction of endothelial cells growth microenvironment are discussed and summarized in designing the next generation of vascular implants.
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Affiliation(s)
- Jingan Li
- School of Materials Science and Engineering, Zhengzhou University, 100 Science Road, Zhengzhou 450001, PR China.,Key Lab. for Advanced Technologies of Materials, Ministry of Education, School of Material Science and Engineering, Southwest Jiaotong University, Chengdu 610031, PR China
| | - Kun Zhang
- Key Lab. for Advanced Technologies of Materials, Ministry of Education, School of Material Science and Engineering, Southwest Jiaotong University, Chengdu 610031, PR China.,School of Life Science, Zhengzhou University, 100 Science Road, Zhengzhou 450001, PR China
| | - Nan Huang
- Key Lab. for Advanced Technologies of Materials, Ministry of Education, School of Material Science and Engineering, Southwest Jiaotong University, Chengdu 610031, PR China
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Intraocular silicone implant to treat chronic ocular hypotony-preliminary feasibility data. Graefes Arch Clin Exp Ophthalmol 2016; 254:2131-2139. [PMID: 27165132 DOI: 10.1007/s00417-016-3364-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 04/13/2016] [Accepted: 04/19/2016] [Indexed: 10/21/2022] Open
Abstract
PURPOSE Ocular hypotony secondary to proliferative vitreoretinopathy-related retinal detachment, trauma or inflammation is difficult to treat. Besides endotamponades such as silicone oil, vitreous implants such as iris diaphragms or balloons have been developed to stabilize the eye and to prevent phthisis of the globe. Vitreous implants tested thus far exhibit a seam at the attachment site of the hemispheres, or micropores. This manuscript reports the development of a seamless silicone balloon implant without micropores, which can be filled with silicone oil and surface-modified to improve its biocompatibility. Developed for intraocular placement in the management of chronic hypotony and phthisis prevention, it may also be suitable for tamponading retinal detachments. METHODS Silicone was used as the basic structure for the fabrication of a seamless balloon-shaped intraocular implant, which was coated by employing a six-arm star-shaped (sP) macromer of a copolymer of 80 % ethylene oxide (EO) and 20 % propylene oxide (PO) with conjugated functional terminal isocyanate groups, NCO-sP(EO-stat-PO), with and without heparin. Three variants of implants, which differ in their surfaces, were manufactured: uncoated silicone, NCO-sP (EO-stat-PO) coated silicone and heparin-NCO-sP (EO-stat-PO) coated silicone implants. To exert a tamponade effect, the implant was filled with silicone oil and its properties were studied. RESULTS Seamless thin balloon implants made of silicone, which are considered biocompatible and intrinsically resistant to biological attacks in vivo, could be fabricated in different sizes. The silicone oil-filled implant can mimic the mechanism of buoyant force and high surface tension of silicone oil, which is the only long-term vitreous substitute currently available. The silicone oil-filled implant can also mimic the natural vitreous body by occupying the entire posterior segment. CONCLUSIONS The intraocular silicone implant as an alternative long-term treatment of chronic ocular hypotony might offer a new option for clinical ophthalmological practice. In vivo studies need to be performed to collect more data on the implant's long-term mechanical and optical properties, as well as long-term biocompatibility.
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Rossi A, Wistlich L, Heffels KH, Walles H, Groll J. Isotropic Versus Bipolar Functionalized Biomimetic Artificial Basement Membranes and Their Evaluation in Long-Term Human Cell Co-Culture. Adv Healthc Mater 2016; 5:1939-48. [PMID: 27283510 DOI: 10.1002/adhm.201600224] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 04/21/2016] [Indexed: 01/19/2023]
Abstract
In addition to dividing tissues into compartments, basement membranes are crucial as cell substrates and to regulate cellular behavior. The development of artificial basement membranes is indispensable for the ultimate formation of functional engineered tissues; however, pose a challenge due to their complex structure. Herein, biodegradable electrospun polyester meshes are presented, exhibiting isotropic or bipolar bioactivation as a biomimetic and biofunctional model of the natural basement membrane. In a one-step preparation process, reactive star-shaped prepolymer additives, which generate a hydrophilic fiber surface, are electrospun with cell-adhesion-mediating peptides, derived from major components of the basement membrane. Human skin cells adhere to the functionalized meshes, and long-term co-culture experiments confirm that the artificial basement membranes recapitulate and preserve tissue specific functions. Several layers of immortalized human keratinocytes grow on the membranes, differentiating toward the surface and expressing typical epithelial markers. Fibroblasts migrate into the reticular lamina mimicking part of the mesh. Both cells types begin to produce extracellular matrix proteins and to remodel the initial membrane. It is shown at the example of skin that the artificial basement membrane design provokes biomimetic responses of different cell types and can thus be used as basis for the future development of basement membrane containing tissues.
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Affiliation(s)
- Angela Rossi
- Chair for Tissue Engineering and Regenerative Medicine; University of Würzburg; Translational Center Würzburg “Regenerative Therapies in Oncology and Musculoskeletal Diseases”; Würzburg Branch of the Fraunhofer Institute for Interfacial Engineering and Biotechnology; Röntgenring 11 97070 Würzburg Germany
- Chair for Functional Materials in Medicine and Dentistry; University of Würzburg; Pleicherwall 2 97070 Würzburg Germany
| | - Laura Wistlich
- Chair for Functional Materials in Medicine and Dentistry; University of Würzburg; Pleicherwall 2 97070 Würzburg Germany
| | - Karl-Heinz Heffels
- Chair for Functional Materials in Medicine and Dentistry; University of Würzburg; Pleicherwall 2 97070 Würzburg Germany
| | - Heike Walles
- Chair for Tissue Engineering and Regenerative Medicine; University of Würzburg; Translational Center Würzburg “Regenerative Therapies in Oncology and Musculoskeletal Diseases”; Würzburg Branch of the Fraunhofer Institute for Interfacial Engineering and Biotechnology; Röntgenring 11 97070 Würzburg Germany
| | - Jürgen Groll
- Chair for Functional Materials in Medicine and Dentistry; University of Würzburg; Pleicherwall 2 97070 Würzburg Germany
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Chen Z, Li Q, Chen J, Luo R, Maitz MF, Huang N. Immobilization of serum albumin and peptide aptamer for EPC on polydopamine coated titanium surface for enhanced in-situ self-endothelialization. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 60:219-229. [DOI: 10.1016/j.msec.2015.11.044] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Revised: 08/11/2015] [Accepted: 11/16/2015] [Indexed: 01/29/2023]
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Ren X, Feng Y, Guo J, Wang H, Li Q, Yang J, Hao X, Lv J, Ma N, Li W. Surface modification and endothelialization of biomaterials as potential scaffolds for vascular tissue engineering applications. Chem Soc Rev 2015; 44:5680-742. [DOI: 10.1039/c4cs00483c] [Citation(s) in RCA: 359] [Impact Index Per Article: 39.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This review highlights the recent developments of surface modification and endothelialization of biomaterials in vascular tissue engineering applications.
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Affiliation(s)
- Xiangkui Ren
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
- Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin)
| | - Yakai Feng
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
- Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin)
| | - Jintang Guo
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
- Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin)
| | - Haixia Wang
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Qian Li
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Jing Yang
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Xuefang Hao
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Juan Lv
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Nan Ma
- Institute of Chemistry and Biochemistry
- Free University of Berlin
- D-14195 Berlin
- Germany
| | - Wenzhong Li
- Department of Cardiac Surgery
- University of Rostock
- D-18057 Rostock
- Germany
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Laskar P, Samanta S, Ghosh SK, Dey J. In vitro evaluation of pH-sensitive cholesterol-containing stable polymeric micelles for delivery of camptothecin. J Colloid Interface Sci 2014; 430:305-14. [DOI: 10.1016/j.jcis.2014.05.068] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 05/30/2014] [Accepted: 05/31/2014] [Indexed: 12/28/2022]
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Thalla PK, Fadlallah H, Liberelle B, Lequoy P, De Crescenzo G, Merhi Y, Lerouge S. Chondroitin Sulfate Coatings Display Low Platelet but High Endothelial Cell Adhesive Properties Favorable for Vascular Implants. Biomacromolecules 2014; 15:2512-20. [DOI: 10.1021/bm5003762] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Pradeep K. Thalla
- Laboratory
of Endovascular Biomaterials (LBeV), Centre hospitalier de l’Université de Montréal (CRCHUM), 900 Saint Denis, Tour Viger, 11th
Floor, Montreal, QC, H2X 0A9, Canada
- Department
of Mechanical Engineering, École de technologie supérieure (ÉTS), 1100 Boulevard Notre-Dame West, Montreal, QC, H3C 1K3, Canada
| | - Hicham Fadlallah
- Department
of Mechanical Engineering, École de technologie supérieure (ÉTS), 1100 Boulevard Notre-Dame West, Montreal, QC, H3C 1K3, Canada
- Laboratory
of Thrombosis and Haemostasis, Montreal Heart Institute, 5000
Belanger, Montreal, QC, H1T 1C8, Canada
| | - Benoit Liberelle
- Department
of Chemical Engineering, École Polytechnique de Montréal, P.O. Box 6079, Succ. Centre-Ville, Montreal, QC, H3C 3A7, Canada
| | - Pauline Lequoy
- Laboratory
of Endovascular Biomaterials (LBeV), Centre hospitalier de l’Université de Montréal (CRCHUM), 900 Saint Denis, Tour Viger, 11th
Floor, Montreal, QC, H2X 0A9, Canada
- Department
of Mechanical Engineering, École de technologie supérieure (ÉTS), 1100 Boulevard Notre-Dame West, Montreal, QC, H3C 1K3, Canada
| | - Gregory De Crescenzo
- Department
of Chemical Engineering, École Polytechnique de Montréal, P.O. Box 6079, Succ. Centre-Ville, Montreal, QC, H3C 3A7, Canada
| | - Yahye Merhi
- Laboratory
of Thrombosis and Haemostasis, Montreal Heart Institute, 5000
Belanger, Montreal, QC, H1T 1C8, Canada
| | - Sophie Lerouge
- Laboratory
of Endovascular Biomaterials (LBeV), Centre hospitalier de l’Université de Montréal (CRCHUM), 900 Saint Denis, Tour Viger, 11th
Floor, Montreal, QC, H2X 0A9, Canada
- Department
of Mechanical Engineering, École de technologie supérieure (ÉTS), 1100 Boulevard Notre-Dame West, Montreal, QC, H3C 1K3, Canada
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Major TC, Brisbois EJ, Jones AM, Zanetti ME, Annich GM, Bartlett RH, Handa H. The effect of a polyurethane coating incorporating both a thrombin inhibitor and nitric oxide on hemocompatibility in extracorporeal circulation. Biomaterials 2014; 35:7271-85. [PMID: 24927680 DOI: 10.1016/j.biomaterials.2014.05.036] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 05/15/2014] [Indexed: 01/23/2023]
Abstract
Nitric oxide (NO) releasing (NORel) materials have been extensively investigated to create localized increases in NO concentration by the proton driven diazeniumdiolate-containing polymer coatings and demonstrated to improve extracorporeal circulation (ECC) hemocompatibility. In this work, the NORel polymeric coating composed of a diazeniumdiolated dibutylhexanediamine (DBHD-N2O2)-containing hydrophobic Elast-eon™ (E2As) polyurethane was combined with a direct thrombin inhibitor, argatroban (AG), and evaluated in a 4 h rabbit thrombogenicity model without systemic anticoagulation. In addition, the immobilizing of argatroban to E2As polymer was achieved by either a polyethylene glycol-containing (PEGDI) or hexane methylene (HMDI) diisocyanate linker. The combined polymer film was coated on the inner walls of ECC circuits to yield significantly reduced ECC thrombus formation compared to argatroban alone ECC control after 4 h blood exposure (0.6 ± 0.1 AG/HMDI/NORel vs 1.7 ± 0.2 cm(2) AG/HMDI control). Platelet count (2.8 ± 0.3 AG/HMDI/NORel vs 1.9 ± 0.1 × 10(8)/ml AG/HMDI control) and plasma fibrinogen levels were preserved after 4 h blood exposure with both the NORel/argatroban combination and the AG/HMDI control group compared to baseline. Platelet function as measured by aggregometry remained near normal in both the AG/HMDI/NORel (63 ± 5%) and AG/HMDI control (58 ± 7%) groups after 3 h compared to baseline (77 ± 1%). Platelet P-selectin mean fluorescence intensity (MFI) as measured by flow cytometry also remained near baseline levels after 4 h on ECC to ex vivo collagen stimulation (16 ± 3 AG/HMDI/NORel vs 11 ± 2 MFI baseline). These results suggest that the combined AG/HMDI/NORel polymer coating preserves platelets in blood exposure to ECCs to a better degree than AG/PEGDI/NORel, NORel alone or AG alone. These combined antithrombin, NO-mediated antiplatelet effects were shown to improve thromboresistance of the AG/HMDI/NORel polymer-coated ECCs and move potential nonthrombogenic polymers closer to mimicking vascular endothelium.
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Affiliation(s)
- Terry C Major
- Department of Surgery, University of Michigan Medical Center, Ann Arbor, MI, USA.
| | | | - Anna M Jones
- Department of Surgery, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Margaux E Zanetti
- Department of Surgery, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Gail M Annich
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Robert H Bartlett
- Department of Surgery, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Hitesh Handa
- Department of Surgery, University of Michigan Medical Center, Ann Arbor, MI, USA.
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Surface modification of biomaterials: a quest for blood compatibility. Int J Biomater 2012; 2012:707863. [PMID: 22693509 PMCID: PMC3368185 DOI: 10.1155/2012/707863] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Accepted: 02/22/2012] [Indexed: 02/02/2023] Open
Abstract
Cardiovascular implants must resist thrombosis and intimal hyperplasia to maintain patency. These implants when in contact with blood face a challenge to oppose the natural coagulation process that becomes activated. Surface protein adsorption and their relevant 3D confirmation greatly determine the degree of blood compatibility. A great deal of research efforts are attributed towards realising such a surface, which comprise of a range of methods on surface modification. Surface modification methods can be broadly categorized as physicochemical modifications and biological modifications. These modifications aim to modulate platelet responses directly through modulation of thrombogenic proteins or by inducing antithrombogenic biomolecules that can be biofunctionalised onto surfaces or through inducing an active endothelium. Nanotechnology is recognising a great role in such surface modification of cardiovascular implants through biofunctionalisation of polymers and peptides in nanocomposites and through nanofabrication of polymers which will pave the way for finding a closer blood match through haemostasis when developing cardiovascular implants with a greater degree of patency.
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Oligonucleotide and Parylene Surface Coating of Polystyrene and ePTFE for Improved Endothelial Cell Attachment and Hemocompatibility. Int J Biomater 2012; 2012:397813. [PMID: 22481939 PMCID: PMC3312249 DOI: 10.1155/2012/397813] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Revised: 11/10/2011] [Accepted: 11/14/2011] [Indexed: 11/28/2022] Open
Abstract
In vivo self-endothelialization by endothelial cell adhesion on cardiovascular implants is highly desirable. DNA-oligonucleotides are an intriguing coating material with nonimmunogenic characteristics and the feasibility of easy and rapid chemical fabrication. The objective of this study was the creation of cell adhesive DNA-oligonucleotide coatings on vascular implant surfaces. DNA-oligonucleotides immobilized by adsorption on parylene (poly(monoaminomethyl-para-xylene)) coated polystyrene and ePTFE were resistant to high shear stress (9.5 N/m2) and human blood serum for up to 96 h. Adhesion of murine endothelial progenitor cells, HUVECs and endothelial cells from human adult saphenous veins as well as viability over a period of 14 days of HUVECs on oligonucleotide coated samples under dynamic culture conditions was significantly enhanced (P < 0.05). Oligonucleotide-coated surfaces revealed low thrombogenicity and excellent hemocompatibility after incubation with human blood. These properties suggest the suitability of immobilization of DNA-oligonucleotides for biofunctionalization of blood vessel substitutes for improved in vivo endothelialization.
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Cai T, Hu PD, Sun M, Zhou J, Tsai YT, Baker D, Tang L. Novel thermogelling dispersions of polymer nanoparticles for controlled protein release. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2012; 8:1301-8. [PMID: 22349097 DOI: 10.1016/j.nano.2012.02.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2011] [Revised: 01/12/2012] [Accepted: 02/10/2012] [Indexed: 11/29/2022]
Abstract
UNLABELLED A novel poly(oligo(ethylene glycol) methyl ether methacrylate-co-oligo(ethylene glycol) ethyl ether methacrylate)-poly(acrylic acid) interpenetrating network (IPN) nanoparticle was synthesized. The temperature-responsive properties of the IPN nanoparticles were investigated by a dynamic light scattering method. Atomic force microscopic images confirmed the homogenous and monodisperse morphology of the IPN nanoparticles. Both visual observation and viscosity testing demonstrated that the IPN nanoparticles exhibit thermogelling properties at body temperature, 37 °C. Subsequent studies verified that such temperature-sensitive properties of IPN nanoparticles allow their ease of injection and then slow release of model proteins, both in vitro and in vivo. Histological analysis showed that our IPN implants exerted minimal inflammation following subcutaneous implantation. Our results support the idea that, by simply mixing with proteins of interest, the novel IPN nanoparticles can be used to form in situ thermogelling devices for controlled protein release. FROM THE CLINICAL EDITOR This paper discusses a temperature responsive interpenetrating network (IPN) polymeric nanoparticle that can be used to form in situ thermogelling devices for controlled protein release by simply mixing them with proteins of interest.
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Affiliation(s)
- Tong Cai
- Department of Physics, University of North Texas, Denton, Texas, USA
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Zhou J, Tsai YT, Weng H, Tang L. Noninvasive assessment of localized inflammatory responses. Free Radic Biol Med 2012; 52:218-26. [PMID: 22080048 PMCID: PMC3249500 DOI: 10.1016/j.freeradbiomed.2011.10.452] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2011] [Revised: 10/19/2011] [Accepted: 10/19/2011] [Indexed: 12/27/2022]
Abstract
Inflammatory diseases are associated with the accumulation of activated inflammatory cells, particularly polymorphonuclear neutrophils (PMNs), which release reactive oxygen species (ROS) to eradicate foreign bodies and microorganisms. To assess the location and extent of localized inflammatory responses, L-012, a highly sensitive chemiluminescent probe, was employed to noninvasively monitor the production of ROS. We found that L-012-associated chemiluminescence imaging can be used to identify and to quantify the extent of inflammatory responses. Furthermore, regardless of differences among animal models, there is a good linear relationship between chemiluminescence intensity and PMN numbers surrounding inflamed tissue. Depletion of PMNs substantially diminished L-012-associated chemiluminescence in vivo. Finally, L-012-associated chemiluminescence imaging was found to be a powerful tool for assessing implant-mediated inflammatory responses by measuring chemiluminescence intensity at the implantation sites. These results support the use of L-012 for monitoring the kinetics of inflammatory responses in vivo via the detection and quantification of ROS production.
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Affiliation(s)
| | | | - Hong Weng
- Department of Bioengineering, The University of Texas at Arlington, TX 76019
| | - Liping Tang
- Department of Bioengineering, The University of Texas at Arlington, TX 76019
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NCO-sP(EO-stat-PO) coatings on gold sensors--a QCM study of hemocompatibility. SENSORS 2011; 11:5253-69. [PMID: 22163899 PMCID: PMC3231391 DOI: 10.3390/s110505253] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2011] [Revised: 04/19/2011] [Accepted: 05/09/2011] [Indexed: 11/17/2022]
Abstract
The reliability of implantable blood sensors is often hampered by unspecific adsorption of plasma proteins and blood cells. This not only leads to a loss of sensor signal over time, but can also result in undesired host vs. graft reactions. Within this study we evaluated the hemocompatibility of isocyanate conjugated star shaped polytheylene oxide-polypropylene oxide co-polymers NCO-sP(EO-stat-PO) when applied to gold surfaces as an auspicious coating material for gold sputtered blood contacting sensors. Quartz crystal microbalance (QCM) sensors were coated with ultrathin NCO-sP(EO-stat-PO) films and compared with uncoated gold sensors. Protein resistance was assessed by QCM measurements with fibrinogen solution and platelet poor plasma (PPP), followed by quantification of fibrinogen adsorption. Hemocompatibility was tested by incubation with human platelet rich plasma (PRP). Thrombin antithrombin-III complex (TAT), β-thromboglobulin (β-TG) and platelet factor 4 (PF4) were used as coagulation activation markers. Furthermore, scanning electron microscopy (SEM) was used to visualize platelet adhesion to the sensor surfaces. Compared to uncoated gold sensors, NCO-sP(EO-stat-PO) coated sensors revealed significant better resistance against protein adsorption, lower TAT generation and a lower amount of adherent platelets. Moreover, coating with ultrathin NCO-sP(EO-stat-PO) films creates a cell resistant hemocompatible surface on gold that increases the chance of prolonged sensor functionality and can easily be modified with specific receptor molecules.
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In vivo PEG modification of vascular surfaces for targeted delivery. J Vasc Surg 2011; 55:1087-95. [PMID: 22169667 DOI: 10.1016/j.jvs.2011.09.081] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2011] [Revised: 09/23/2011] [Accepted: 09/24/2011] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Thrombosis and restenosis remain problematic for many intravascular procedures. Previously, it has been demonstrated that modifying an injured vascular surface with a protein-reactive polymer could block undesirable platelet deposition. As an added benefit, it would be advantageous if one could target therapeutics to the injured site. This study investigates a site-specific delivery system to target microspheres to vascular surfaces modified with a reactive polyethylene glycol tagged with biotin. METHODS Rabbit femoral arteries were injured with a 2F embolectomy catheter. Modification of the vascular surface was achieved using a channeled balloon catheter or small-diameter tube. Microspheres were injected intravenously through catheterization of the ear vein. Polymer modification on the injured surface and delivery of microspheres was quantified using epifluorescence microscopy at 0, 24, 48, and 72 hours. RESULTS Polymer modification of the vascular surface could be achieved using a channeled drug delivery catheter or small-diameter tube with similar results. Maximum polymer coverage occurred at 0 hours and decreased to 85% maximal at 24 hours, 72% at 48 hours, and 67% at 72 hours. The initial number of microspheres per mm(2) binding to modified, injured arteries was 304 versus 141 for the unmodified, damaged control (P < .01). At subsequent times, the number of adherent microspheres to modified, injured arteries decreased by 50%, 70%, and 84% at 24, 48, and 72 hours, respectively; while nonspecific binding to unmodified, injured arteries quickly decreased by 93%. Initial microsphere binding to modified, healthy arteries was 153 microspheres/mm(2) as opposed to 26 microspheres/mm(2) for the unmodified, healthy controls (P < .01). CONCLUSIONS Chemical modification of injured vessels following intravascular procedures can be readily accomplished in vivo to create a substrate for targeted delivery systems. As a proof of concept, targeted microspheres preferentially adhered to polymer-modified surfaces as opposed to injured, unmodified, or healthy vascular surfaces.
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Bonduelle CV, Lau WM, Gillies ER. Preparation of protein- and cell-resistant surfaces by hyperthermal hydrogen induced cross-linking of poly(ethylene oxide). ACS APPLIED MATERIALS & INTERFACES 2011; 3:1740-1748. [PMID: 21491963 DOI: 10.1021/am200241b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The functionalization of surfaces with poly(ethylene oxide) (PEO) is an effective means of imparting resistance to the adsorption of proteins and the attachment and growth of cells, properties that are critical for many biomedical applications. In this work, a new hyperthermal hydrogen induced cross-linking (HHIC) method was explored as a simple one-step approach for attaching PEO to surfaces through the selective cleavage of C-H bonds and subsequent cross-linking of the resulting carbon radicals. In order to study the effects of the process on the polymer, PEO-coated silicon wafers were prepared and the effects of different treatment times were investigated. Subsequently, using an optimized treatment time and a modified butyl polymer with increased affinity for PEO, the technique was applied to butyl rubber surfaces. All of the treated surfaces exhibited significantly reduced protein adsorption and cell growth relative to control surfaces and compared favorably with surfaces that were functionalized with PEO using conventional chemical methods. Thus HHIC is a simple and effective means of attaching PEO to non-functional polymer surfaces.
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Affiliation(s)
- Colin V Bonduelle
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Canada N6A5B7
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31
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New Strategies in the Development of Antimicrobial Coatings: The Example of Increasing Usage of Silver and Silver Nanoparticles. Polymers (Basel) 2011. [DOI: 10.3390/polym3010340] [Citation(s) in RCA: 343] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
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Tsurkan MV, Chwalek K, Levental KR, Freudenberg U, Werner C. Modular StarPEG-Heparin Gels with Bifunctional Peptide Linkers. Macromol Rapid Commun 2010; 31:1529-33. [DOI: 10.1002/marc.201000155] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2010] [Revised: 04/24/2010] [Indexed: 11/07/2022]
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Biocompatibility investigation of polyethylene glycol and alginate-poly-L-lysine for islet encapsulation. ASAIO J 2010; 56:241-5. [PMID: 20400892 DOI: 10.1097/mat.0b013e3181d7b8e3] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
The use of microencapsulation with alginate-poly-l-lysine (PLL) as the encapsulation material has been hampered by overgrowth of collagen around implanted capsules. Studies have shown that poly(ethylene glycol) (PEG) has higher biocompatibility than PLL. In this project, we examined the biocompatibility of PEG in comparison with PLL in the Lewis rat model. Capsules made from either PEG or PLL were implanted into Lewis rats in three anatomical sites: subcutaneous (SC), intramuscular (IM), and intra-epididymis (IE). After 2 or 4 weeks, capsules were retrieved, sectioned, and stained with Sirius Red for analysis of fibrotic overgrowth with ImageJ software. The results were statistically analyzed using either unpaired t test or analysis of variance (ANOVA). PEG demonstrated significantly better biocompatibility in SC, at both 2 and 4 weeks, and IE at 2 weeks (p < 0.0001). No significant differences were found in IM implantation at either time point (p = 0.36) between the two materials. However, there was significantly heavier fibrotic overgrowth around PEG capsules in IE than PLL capsules at 4 weeks (p < 0.01). When compared among the anatomical sites, IM implantation demonstrated significantly less fibrotic overgrowth than other sites for both materials (p < 0.01). In conclusion, PLL and PEG may induce different levels of fibrosis based on anatomical location and duration of implantation.
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Grafahrend D, Heffels KH, Möller M, Klee D, Groll J. Electrospun, Biofunctionalized Fibers as Tailored in vitro Substrates for Keratinocyte Cell Culture. Macromol Biosci 2010; 10:1022-7. [DOI: 10.1002/mabi.201000068] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Schleicher M, Wendel HP, Huber A, Fritze O, Stock U. In-vivo-Züchtung von Herzklappengewebe. ZEITSCHRIFT FUR HERZ THORAX UND GEFASSCHIRURGIE 2010. [DOI: 10.1007/s00398-009-0753-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Yancheva E, Paneva D, Manolova N, Mincheva R, Danchev D, Dubois P, Rashkov I. Tuning of the Surface Biological Behavior of Poly(l-lactide)-Based Electrospun Materials by Polyelectrolyte Complex Formation. Biomacromolecules 2010; 11:521-32. [DOI: 10.1021/bm901307x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Elena Yancheva
- Laboratory of Bioactive Polymers, Institute of Polymers, Bulgarian Academy of Sciences, Acad. G. Bonchev Street Bl. 103A, 1113 Sofia, Bulgaria, Laboratory of Polymeric and Composite Materials, University of Mons-UMONS, Place du Parc 20, B-7000 Mons, Belgium, and Department of Haemostasis, Military Medical Academy, G. Sofijski Street 3, 1606 Sofia, Bulgaria
| | - Dilyana Paneva
- Laboratory of Bioactive Polymers, Institute of Polymers, Bulgarian Academy of Sciences, Acad. G. Bonchev Street Bl. 103A, 1113 Sofia, Bulgaria, Laboratory of Polymeric and Composite Materials, University of Mons-UMONS, Place du Parc 20, B-7000 Mons, Belgium, and Department of Haemostasis, Military Medical Academy, G. Sofijski Street 3, 1606 Sofia, Bulgaria
| | - Nevena Manolova
- Laboratory of Bioactive Polymers, Institute of Polymers, Bulgarian Academy of Sciences, Acad. G. Bonchev Street Bl. 103A, 1113 Sofia, Bulgaria, Laboratory of Polymeric and Composite Materials, University of Mons-UMONS, Place du Parc 20, B-7000 Mons, Belgium, and Department of Haemostasis, Military Medical Academy, G. Sofijski Street 3, 1606 Sofia, Bulgaria
| | - Rosica Mincheva
- Laboratory of Bioactive Polymers, Institute of Polymers, Bulgarian Academy of Sciences, Acad. G. Bonchev Street Bl. 103A, 1113 Sofia, Bulgaria, Laboratory of Polymeric and Composite Materials, University of Mons-UMONS, Place du Parc 20, B-7000 Mons, Belgium, and Department of Haemostasis, Military Medical Academy, G. Sofijski Street 3, 1606 Sofia, Bulgaria
| | - Dobri Danchev
- Laboratory of Bioactive Polymers, Institute of Polymers, Bulgarian Academy of Sciences, Acad. G. Bonchev Street Bl. 103A, 1113 Sofia, Bulgaria, Laboratory of Polymeric and Composite Materials, University of Mons-UMONS, Place du Parc 20, B-7000 Mons, Belgium, and Department of Haemostasis, Military Medical Academy, G. Sofijski Street 3, 1606 Sofia, Bulgaria
| | - Philippe Dubois
- Laboratory of Bioactive Polymers, Institute of Polymers, Bulgarian Academy of Sciences, Acad. G. Bonchev Street Bl. 103A, 1113 Sofia, Bulgaria, Laboratory of Polymeric and Composite Materials, University of Mons-UMONS, Place du Parc 20, B-7000 Mons, Belgium, and Department of Haemostasis, Military Medical Academy, G. Sofijski Street 3, 1606 Sofia, Bulgaria
| | - Iliya Rashkov
- Laboratory of Bioactive Polymers, Institute of Polymers, Bulgarian Academy of Sciences, Acad. G. Bonchev Street Bl. 103A, 1113 Sofia, Bulgaria, Laboratory of Polymeric and Composite Materials, University of Mons-UMONS, Place du Parc 20, B-7000 Mons, Belgium, and Department of Haemostasis, Military Medical Academy, G. Sofijski Street 3, 1606 Sofia, Bulgaria
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Induction of EPC homing on biofunctionalized vascular grafts for rapid in vivo self-endothelialization — A review of current strategies. Biotechnol Adv 2010; 28:119-29. [DOI: 10.1016/j.biotechadv.2009.10.005] [Citation(s) in RCA: 161] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2009] [Revised: 10/14/2009] [Accepted: 10/19/2009] [Indexed: 12/20/2022]
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Schleicher M, Wendel HP, Fritze O, Stock UA. In vivo tissue engineering of heart valves: evolution of a novel concept. Regen Med 2009; 4:613-9. [PMID: 19580409 DOI: 10.2217/rme.09.22] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Current tissue-engineering principles of heart valves include tissue- or stem cell-derived cells with subsequent in vitro incubation on various scaffolds prior to implantation. Limitations of this approach include a long in vitro culture, an accompanied risk of infection and sophisticated, cost-intensive infrastructures. An 'off-the-shelf' heart valve with in vivo endothelialization and tissue-regeneration potential would overcome these limitations. Additionally, the development of a heart valve with growth potential would be a huge improvement for pediatric patients. This article discusses different starter matrices, homing and immobilization strategies of host cells and masking approaches of inflammatory structures for in vivo surface and tissue engineering of heart valves. Novel concepts will be presented based on highly specific DNA-aptamers immobilized on the heart valve surface as capture molecules for endothelial progenitor cells circulating in the bloodstream.
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Affiliation(s)
- Martina Schleicher
- Department of Thoracic, Cardiac & Vascular Surgery, University Hospital Tuebingen, Hoppe-Seyler-Strasse 3, 72076 Tuebingen, Germany
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Keul H, Möller M. Synthesis and degradation of biomedical materials based on linear and star shaped polyglycidols. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/pola.23359] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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40
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Jonkheijm P, Weinrich D, Schröder H, Niemeyer CM, Waldmann H. Chemical strategies for generating protein biochips. Angew Chem Int Ed Engl 2008; 47:9618-47. [PMID: 19025742 DOI: 10.1002/anie.200801711] [Citation(s) in RCA: 510] [Impact Index Per Article: 31.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Protein biochips are at the heart of many medical and bioanalytical applications. Increasing interest has been focused on surface activation and subsequent functionalization strategies for immobilizing these biomolecules. Different approaches using covalent and noncovalent chemistry are reviewed; particular emphasis is placed on the chemical specificity of protein attachment and on retention of protein function. Strategies for creating protein patterns (as opposed to protein arrays) are also outlined. An outlook on promising and challenging future directions for protein biochip research and applications is also offered.
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Affiliation(s)
- Pascal Jonkheijm
- Department of Chemical Biology, Max Planck Institute of Molecular Physiology and Faculty of Chemistry, Chemical Biology, Technical University of Dortmund, Otto Hahn Strasse 11, 44227 Dortmund, Germany
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Jonkheijm P, Weinrich D, Schröder H, Niemeyer C, Waldmann H. Chemische Verfahren zur Herstellung von Proteinbiochips. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200801711] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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42
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de Mel A, Jell G, Stevens MM, Seifalian AM. Biofunctionalization of biomaterials for accelerated in situ endothelialization: a review. Biomacromolecules 2008; 9:2969-79. [PMID: 18831592 DOI: 10.1021/bm800681k] [Citation(s) in RCA: 287] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The higher patency rates of cardiovascular implants, including vascular bypass grafts, stents, and heart valves are related to their ability to inhibit thrombosis, intimal hyperplasia, and calcification. In native tissue, the endothelium plays a major role in inhibiting these processes. Various bioengineering research strategies thereby aspire to induce endothelialization of graft surfaces either prior to implantation or by accelerating in situ graft endothelialization. This article reviews potential bioresponsive molecular components that can be incorporated into (and/or released from) biomaterial surfaces to obtain accelerated in situ endothelialization of vascular grafts. These molecules could promote in situ endothelialization by the mobilization of endothelial progenitor cells (EPC) from the bone marrow, encouraging cell-specific adhesion (endothelial cells (EC) and/or EPC) to the graft and, once attached, by controlling the proliferation and differentiation of these cells. EC and EPC interactions with the extracellular matrix continue to be a principal source of inspiration for material biofunctionalization, and therefore, the latest developments in understanding these interactions will be discussed.
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Affiliation(s)
- Achala de Mel
- Centre of Nanotechnology, Biomaterials and Tissue Engineering, UCL Division of Surgery & Interventional Science, University College London, London, United Kingdom
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43
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Scott EA, Nichols MD, Cordova LH, George BJ, Jun YS, Elbert DL. Protein adsorption and cell adhesion on nanoscale bioactive coatings formed from poly(ethylene glycol) and albumin microgels. Biomaterials 2008; 29:4481-93. [PMID: 18771802 DOI: 10.1016/j.biomaterials.2008.08.003] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2008] [Accepted: 08/05/2008] [Indexed: 11/17/2022]
Abstract
Late-term thrombosis on drug-eluting stents is an emerging problem that might be addressed using extremely thin, biologically active hydrogel coatings. We report a dip-coating strategy to covalently link poly(ethylene glycol) (PEG) to substrates, producing coatings with approximately <100 nm thickness. Gelation of PEG-octavinylsulfone with amines in either bovine serum albumin (BSA) or PEG-octaamine was monitored by dynamic light scattering (DLS), revealing the presence of microgels before macrogelation. NMR also revealed extremely high end-group conversions prior to macrogelation, consistent with the formation of highly crosslinked microgels and deviation from Flory-Stockmayer theory. Before macrogelation, the reacting solutions were diluted and incubated with nucleophile-functionalized surfaces. Using optical waveguide lightmode spectroscopy (OWLS) and quartz crystal microbalance with dissipation (QCM-D), we identified a highly hydrated, protein-resistant layer with a thickness of approximately 75 nm. Atomic force microscopy in buffered water revealed the presence of coalesced spheres of various sizes but with diameters less than about 100 nm. Microgel-coated glass or poly(ethylene terephthalate) exhibited reduced protein adsorption and cell adhesion. Cellular interactions with the surface could be controlled by using different proteins to cap unreacted vinylsulfone groups within the coating.
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Affiliation(s)
- Evan A Scott
- Department of Biomedical Engineering and Center for Materials Innovation, Washington University in St. Louis, Campus Box 1097, One Brookings Drive, St. Louis, MO 63105, USA
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44
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Avci-Adali M, Paul A, Ziemer G, Wendel HP. New strategies for in vivo tissue engineering by mimicry of homing factors for self-endothelialisation of blood contacting materials. Biomaterials 2008; 29:3936-45. [PMID: 18640715 DOI: 10.1016/j.biomaterials.2008.07.002] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2008] [Accepted: 07/01/2008] [Indexed: 02/08/2023]
Abstract
For years intensive research has been done to endothelialise vascular prostheses with autologous endothelial cells before implantation in patients. However, this procedure is extremely time-, labor- and cost-intensive and can be realized only in very few clinical cases. The discovery of circulating endothelial progenitor cells (EPCs) in 1997 brought new perspectives for the endothelialisation of blood contacting materials. Coating of synthetic graft surfaces with capture molecules for circulating EPCs mimics a pro-homing substrate for fishing out EPCs directly from the bloodstream after implantation. These cells with high proliferation potential can cover the graft with non-thrombogenic endothelium which maintains optimal haemostasis and minimize the risk of restenosis. In this review, different concepts are discussed to capture circulating EPCs on synthetic vascular grafts after implantation. We hypothesize that in vivo self-endothelialisation of blood contacting materials by homing factor-mimetic capture molecules for EPCs may bring revolutionary new perspectives towards future clinical application of stem cell and tissue engineering strategies.
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Affiliation(s)
- Meltem Avci-Adali
- Department of Thoracic, Cardiac, and Vascular Surgery, University Hospital Tuebingen, Calwerstrasse 7/1, Tuebingen, Germany
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Hoffmann J, Paul A, Harwardt M, Groll J, Reeswinkel T, Klee D, Moeller M, Fischer H, Walker T, Greiner T, Ziemer G, Wendel HP. Immobilized DNA aptamers used as potent attractors for porcine endothelial precursor cells. J Biomed Mater Res A 2008; 84:614-21. [PMID: 17635015 DOI: 10.1002/jbm.a.31309] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Because of their insufficient biocompatibility and high thrombogenicity, small diameter artificial vascular prostheses still do not show a satisfactory patency rate. In vitro endothelialization of artificial grafts before implantation has been established experimentally years ago, but, this procedure is extremely time consuming and expensive. This study deals with the coating of graft surfaces with capture molecules (aptamers) for circulating endothelial progenitor cells (EPCs), mimicking a prohoming substrate to fish out EPCs from the bloodstream after implantation and to create an autologous functional endothelium. Using the SELEX technology, aptamers with a high affinity to EPCs were identified, isolated, and grafted onto polymeric discs using a blood compatible star-PEG coating. A porcine in vitro model that demonstrates the specific adhesion of EPCs and their differentiation into vital endothelial-like cells within 10 days in cell culture is presented. We suggest that the rapid adhesion of EPCs to aptamer-coated implants could be useful to promote endothelial wound healing and to prevent increased neointimal hyperplasia. We hypothesize that future in vivo self-endothelialization of blood contacting implants by homing factor mimetic capture molecules for EPCs may bring revolutionary new perspectives towards clinical applications of stem cell and tissue engineering strategies.
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Affiliation(s)
- Jan Hoffmann
- Department of Thoracic, Cardiac and Vascular Surgery, University of Tuebingen, Tuebingen, Germany
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Draing C, Traub S, Deininger S, Mang P, Möller HM, Manso M, Rossi F, Morath S, Hartung T, von Aulock S. Polypropylene glycol is a selective binding inhibitor for LTA and other structurally related TLR2 agonists. Eur J Immunol 2008; 38:797-808. [DOI: 10.1002/eji.200737466] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Gasteier P, Reska A, Schulte P, Salber J, Offenhäusser A, Moeller M, Groll J. Surface Grafting of PEO-Based Star-Shaped Molecules for Bioanalytical and Biomedical Applications. Macromol Biosci 2007; 7:1010-23. [PMID: 17674362 DOI: 10.1002/mabi.200700064] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
This article reviews surface grafting of star-shaped PEO. The use of star-shaped polymers is compared to linear PEO chains regarding the layer preparation and the ability of the resulting surfaces to resist protein adsorption. We then focus on the use of end-functionalized, star-shaped, PEO-based prepolymers that are able to form covalent crosslinks and functional polymer networks on the substrate. Examples are given for specific protein adsorption as well as for cell adhesion on such layers by covalent embedding of biofunctional molecules. The possibility of coating biomedically relevant polymer substrates in three-dimensional geometries is discussed and examples are shown for poly(ethylene terephthalate) monofilament constructs.
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Affiliation(s)
- Peter Gasteier
- DWI an der RWTH Aachen e.V., Pauwelsstr. 8, 52074 Aachen, Germany
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Aptamer-basierte Stammzelltechnologie zur Erhöhung der Hämokompatibilität. ZEITSCHRIFT FUR HERZ THORAX UND GEFASSCHIRURGIE 2007. [DOI: 10.1007/s00398-007-0583-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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49
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Heyes CD, Groll J, Möller M, Nienhaus GU. Synthesis, patterning and applications of star-shaped poly(ethylene glycol) biofunctionalized surfaces. ACTA ACUST UNITED AC 2007; 3:419-30. [PMID: 17533455 DOI: 10.1039/b700055n] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Poly(ethylene) glycol (PEG) is an excellent material to modify surfaces to resist non-specific protein adsorption. Linear PEG has been extensively studied both theoretically and experimentally and it has been found that resistance of PEG-coated surfaces to protein adsorption depends mainly on the molecular weight of the polymer and the surface grafting density. End-functionalized star-shaped PEGs allow for interpolymer crosslinking to form a dense layer. An excellent example of such a system consists of a 6-arm PEG/PPG (4 : 1) star polymer functionalized with isocyanate using IPDI. The end functionalization may be further biofunctionalized to recognize specific biomolecules such as streptavidin, His-tagged proteins, amino-terminated oligonucleotides and cell receptors. This functionalization may be patterned into specific geometries using stamping techniques or randomly distributed by statistical reaction of the end group with the biofunctional molecule in solution. The surface preparation uses simple spin-, dip- or spray-coating and produces smooth layers with low background fluorescence. These properties, together with the advantageous chemical properties of PEG, render the surfaces ideal for immobilizing proteins on surfaces with detection limits down to the single molecule level. Proteins immobilized on such surfaces are able to maintain their folded, functional form and are able to completely refold if temporarily exposed to denaturing conditions. Immobilized enzyme molecules were able to perform their function with the same activity as the enzyme in solution. Future directions of using surfaces coated with such crosslinked star polymers in highly sensitive and robust biotechnology applications will be discussed.
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Affiliation(s)
- Colin D Heyes
- Institut für Biophysik, Universität Ulm, Albert Einstein Allee 11, 89081 Ulm, Germany
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