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Haderer LM, Zhou Y, Tang P, Daneshgar A, Globke B, Krenzien F, Reutzel-Selke A, Weinhart M, Pratschke J, Sauer IM, Hillebrandt KH, Keshi E. Thrombogenicity assessment of perfusable tissue engineered constructs: a systematic review. TISSUE ENGINEERING. PART B, REVIEWS 2024. [PMID: 39007511 DOI: 10.1089/ten.teb.2024.0078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/16/2024]
Abstract
Vascular surgery faces a critical demand for novel vascular grafts that are biocompatible and thromboresistant. This urgency particularly applies to bypass operations involving small caliber vessels. In the realm of tissue engineering, the development of fully vascularized organs holds great promise as a solution to organ shortage for transplantation. To achieve this, it is imperative to (re-)construct a biocompatible and non-thrombogenic vascular network within these organs. In this systematic review, we identify, classify and discuss basic principles and methods used to perform in vitro/ex vivo dynamic thrombogenicity testing of perfusable tissue engineered organs and tissues. We conducted a pre-registered systematic review of studies published in the last 23 years according to PRISMA-P Guidelines, comprising a systematic data extraction, in-depth analysis and risk of bias assessment of 116 included studies. We identified shaking (n=28), flow loop (n=17), ex vivo (arterio-venous shunt, n=33) and dynamic in vitro models (n=38) as main approaches for thrombogenicity assessment. This comprehensive review unveils a prevalent lack of standardization and serves as a valuable guide in the design of standardized experimental setups.
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Affiliation(s)
| | - Yijun Zhou
- Charite Universitatsmedizin Berlin, Berlin, Berlin, Germany;
| | - Peter Tang
- Charité - Campus Virchow, General-, Visceral-, and Transplantation Surgery, Berlin, Germany;
| | - Assal Daneshgar
- Charite Universitatsmedizin Berlin, Berlin, Berlin, Germany;
| | - Brigitta Globke
- Charite Universitatsmedizin Berlin, Berlin, Berlin, Germany;
| | - Felix Krenzien
- Charite Universitatsmedizin Berlin, Berlin, Berlin, Germany;
| | - Anja Reutzel-Selke
- Charité - Campus Virchow, General-, Visceral-, and Transplantation Surgery, Augustenburger Platz 1, Berlin, Germany, 13353;
| | | | - Johann Pratschke
- Charité - Universitätsmedizin Berlin, General, Visceral, and Transplantation Surgery, Berlin, Germany;
| | - Igor M Sauer
- Charité, General, Visceral and Transplantation Surgery, Augustenburger Platz 1, Berlin, Germany, 13353;
| | - Karl Herbert Hillebrandt
- Charité - Campus Virchow, General-, Visceral-, and Transplantation Surgery, Augstenburgerplatz 1, Berlin, Germany, 13353;
| | - Eriselda Keshi
- Charité Universitätsmedizin Berlin, Chirurgische Klinik, Augustenburger Platz 1, Berlin, Germany, 13353;
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2
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Fuest S, Smeets R, Gosau M, Aavani F, Knipfer C, Grust ALC, Kopp A, Becerikli M, Behr B, Matthies L. Layer-by-Layer Deposition of Regenerated Silk Fibroin─An Approach to the Surface Coating of Biomedical Implant Materials. ACS Biomater Sci Eng 2023; 9:6644-6657. [PMID: 37983947 DOI: 10.1021/acsbiomaterials.3c00852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2023]
Abstract
Biomaterials and coating techniques unlock major benefits for advanced medical therapies. Here, we explored layer-by-layer (LbL) deposition of silk fibroin (SF) by dip coating to deploy homogeneous films on different materials (titanium, magnesium, and polymers) frequently used for orthopedic and other bone-related implants. Titanium and magnesium specimens underwent preceding plasma electrolytic oxidation (PEO) to increase hydrophilicity. This was determined as surface properties were visualized by scanning electron microscopy and contact angle measurements as well as Fourier transform infrared spectroscopy (FTIR) analysis. Finally, biological in vitro evaluations of hemocompatibility, THP-1 cell culture, and TNF-α assays were conducted. A more hydrophilic surface could be achieved using the PEO surface, and the contact angle for magnesium and titanium showed a reduction from 73 to 18° and from 58 to 17°, respectively. Coating with SF proved successful on all three surfaces, and coating thicknesses of up to 5.14 μm (±SD 0.22 μm) were achieved. Using FTIR analysis, it was shown that the insolubility of the material was achieved by post-treatment with water vapor annealing, although the random coil peak (1640-1649 cm-1) and the α-helix peak (at 1650 cm-1) were still evident. SF did not change hemocompatibility, regardless of the substrate, whereas the PEO-coated materials showed improved hemocompatibility. THP-1 cell culture showed that cells adhered excellently to all of the tested material surfaces. Interestingly, SF coatings induced a significantly higher amount of TNF-α for all materials, indicating an inflammatory response, which plays an important role in a variety of physiological processes, including osteogenesis. LbL coatings of SF are shown to be promising candidates to modulate the body's immune response to implants manufactured from titanium, magnesium, and polymers. They may therefore facilitate future applications for bioactive implant coatings. However, further in vivo studies are needed to confirm the proposed effects on osteogenesis in a physiological environment.
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Affiliation(s)
- Sandra Fuest
- Department of Oral and Maxillofacial Surgery, Division of Regenerative Orofacial Medicine, University Medical Center Hamburg-Eppendorf, D-20246 Hamburg, Germany
| | - Ralf Smeets
- Department of Oral and Maxillofacial Surgery, Division of Regenerative Orofacial Medicine, University Medical Center Hamburg-Eppendorf, D-20246 Hamburg, Germany
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, D-20246 Hamburg, Germany
| | - Martin Gosau
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, D-20246 Hamburg, Germany
| | - Farzaneh Aavani
- Department of Oral and Maxillofacial Surgery, Division of Regenerative Orofacial Medicine, University Medical Center Hamburg-Eppendorf, D-20246 Hamburg, Germany
| | - Christian Knipfer
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, D-20246 Hamburg, Germany
| | - Audrey Laure Céline Grust
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, D-20246 Hamburg, Germany
| | | | - Mustafa Becerikli
- Department of Plastic Surgery, BG University Hospital Bergmannsheil, D-44789 Bochum, Germany
| | - Björn Behr
- Department of Plastic Surgery, BG University Hospital Bergmannsheil, D-44789 Bochum, Germany
| | - Levi Matthies
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, D-20246 Hamburg, Germany
- Mildred Scheel Cancer Career Center HaTriCS4, University Medical Center Hamburg-Eppendorf, D-20246 Hamburg, Germany
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3
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Chan D, Chien JC, Axpe E, Blankemeier L, Baker SW, Swaminathan S, Piunova VA, Zubarev DY, Maikawa CL, Grosskopf AK, Mann JL, Soh HT, Appel EA. Combinatorial Polyacrylamide Hydrogels for Preventing Biofouling on Implantable Biosensors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2109764. [PMID: 35390209 PMCID: PMC9793805 DOI: 10.1002/adma.202109764] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 04/04/2022] [Indexed: 05/29/2023]
Abstract
Biofouling on the surface of implanted medical devices and biosensors severely hinders device functionality and drastically shortens device lifetime. Poly(ethylene glycol) and zwitterionic polymers are currently considered "gold-standard" device coatings to reduce biofouling. To discover novel anti-biofouling materials, a combinatorial library of polyacrylamide-based copolymer hydrogels is created, and their ability is screened to prevent fouling from serum and platelet-rich plasma in a high-throughput parallel assay. It is found that certain nonintuitive copolymer compositions exhibit superior anti-biofouling properties over current gold-standard materials, and machine learning is used to identify key molecular features underpinning their performance. For validation, the surfaces of electrochemical biosensors are coated with hydrogels and their anti-biofouling performance in vitro and in vivo in rodent models is evaluated. The copolymer hydrogels preserve device function and enable continuous measurements of a small-molecule drug in vivo better than gold-standard coatings. The novel methodology described enables the discovery of anti-biofouling materials that can extend the lifetime of real-time in vivo sensing devices.
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Affiliation(s)
- Doreen Chan
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
| | - Jun-Chau Chien
- Department of Electrical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Eneko Axpe
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Louis Blankemeier
- Department of Electrical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Samuel W Baker
- Department of Comparative Medicine, Stanford University, Stanford, CA, 94305, USA
| | | | | | | | - Caitlin L Maikawa
- Department of Bioengineering, Stanford University, Stanford, CA, 94305, USA
| | - Abigail K Grosskopf
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Joseph L Mann
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
| | - H Tom Soh
- Department of Electrical Engineering, Stanford University, Stanford, CA, 94305, USA
- ChEM-H Institute, Stanford University, Stanford, CA, 94304, USA
- Chan Zuckerberg Biohub, San Francisco, CA, 94158, USA
| | - Eric A Appel
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
- Department of Bioengineering, Stanford University, Stanford, CA, 94305, USA
- ChEM-H Institute, Stanford University, Stanford, CA, 94304, USA
- Department of Pediatrics - Endocrinology, Stanford University School of Medicine, Stanford, CA, 94305, USA
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4
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Billing F, Walter B, Fink S, Arefaine E, Pickarski L, Maier S, Kretz R, Jakobi M, Feuerer N, Schneiderhan-Marra N, Burkhardt C, Templin M, Zeck A, Krastev R, Hartmann H, Shipp C. Altered Proinflammatory Responses to Polyelectrolyte Multilayer Coatings Are Associated with Differences in Protein Adsorption and Wettability. ACS APPLIED MATERIALS & INTERFACES 2021; 13:55534-55549. [PMID: 34762399 DOI: 10.1021/acsami.1c16175] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
A full understanding of the relationship between surface properties, protein adsorption, and immune responses is lacking but is of great interest for the design of biomaterials with desired biological profiles. In this study, polyelectrolyte multilayer (PEM) coatings with gradient changes in surface wettability were developed to shed light on how this impacts protein adsorption and immune response in the context of material biocompatibility. The analysis of immune responses by peripheral blood mononuclear cells to PEM coatings revealed an increased expression of proinflammatory cytokines tumor necrosis factor (TNF)-α, macrophage inflammatory protein (MIP)-1β, monocyte chemoattractant protein (MCP)-1, and interleukin (IL)-6 and the surface marker CD86 in response to the most hydrophobic coating, whereas the most hydrophilic coating resulted in a comparatively mild immune response. These findings were subsequently confirmed in a cohort of 24 donors. Cytokines were produced predominantly by monocytes with a peak after 24 h. Experiments conducted in the absence of serum indicated a contributing role of the adsorbed protein layer in the observed immune response. Mass spectrometry analysis revealed distinct protein adsorption patterns, with more inflammation-related proteins (e.g., apolipoprotein A-II) present on the most hydrophobic PEM surface, while the most abundant protein on the hydrophilic PEM (apolipoprotein A-I) was related to anti-inflammatory roles. The pathway analysis revealed alterations in the mitogen-activated protein kinase (MAPK)-signaling pathway between the most hydrophilic and the most hydrophobic coating. The results show that the acute proinflammatory response to the more hydrophobic PEM surface is associated with the adsorption of inflammation-related proteins. Thus, this study provides insights into the interplay between material wettability, protein adsorption, and inflammatory response and may act as a basis for the rational design of biomaterials.
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Affiliation(s)
- Florian Billing
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Bernadette Walter
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Simon Fink
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Elsa Arefaine
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Luisa Pickarski
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Sandra Maier
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Robin Kretz
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Meike Jakobi
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Nora Feuerer
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
- Department of Biomedical Engineering, Eberhard Karls University Tübingen, 72076 Tübingen, Germany
| | | | - Claus Burkhardt
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Markus Templin
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Anne Zeck
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Rumen Krastev
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
- Faculty of Applied Chemistry, Reutlingen University, 72762 Reutlingen, Germany
| | - Hanna Hartmann
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Christopher Shipp
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
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5
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van Gaal RC, van Sprang JF, Borneman Z, Dankers PYW. Development of Poor Cell Adhesive Immersion Precipitation Membranes Based on Supramolecular Bis-Urea Polymers. Macromol Biosci 2019; 20:e1900277. [PMID: 31885206 DOI: 10.1002/mabi.201900277] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 11/19/2019] [Indexed: 11/07/2022]
Abstract
A variety of biomedical applications requires tailored membranes; fabrication through a mix-and-match approach is simple and desired. Polymers based on supramolecular bis-urea (BU) moieties are capable of modular integration through directed non-covalent stacking. Here, it is proposed that non-cell adhesive properties can be introduced in polycaprolactone-BU-based membranes by the addition of poly(ethylene glycol) (PEG)-BU during immersion precipitation membrane fabrication, while unmodified PEG is not retained in the membrane. PEG-BU addition results in denser membranes with a similar pore size compared to pristine membranes, while PEG addition induces defect formation. Infrared spectroscopy and surface hydrophobicity measurements indicate that PEG-BU is retained during membrane processing. Additionally, PEG-BU incorporation successfully leads to poor cell adhesive surfaces. No evidence is observed to indicate PEG retention. The results obtained indicate that the BU system enables intimate mixing of BU-modified polymers after processing. Collectively, the results provide the first steps toward BU-based immersion precipitated supramolecular membranes for biomedical applications.
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Affiliation(s)
- Ronald C van Gaal
- Department of Biomedical Engineering, Laboratory of Chemical Biology, and Institute for Complex Molecular Systems, Eindhoven University of Technology, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Johnick F van Sprang
- Department of Biomedical Engineering, Laboratory of Chemical Biology, and Institute for Complex Molecular Systems, Eindhoven University of Technology, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Zandrie Borneman
- Department of Chemical Engineering and Chemistry, Membrane Materials and Processes, Eindhoven University of Technology, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Patricia Y W Dankers
- Department of Biomedical Engineering, Laboratory of Chemical Biology, and Institute for Complex Molecular Systems, Eindhoven University of Technology, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands
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6
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Generali M, Casanova EA, Kehl D, Wanner D, Hoerstrup SP, Cinelli P, Weber B. Autologous endothelialized small-caliber vascular grafts engineered from blood-derived induced pluripotent stem cells. Acta Biomater 2019; 97:333-343. [PMID: 31344511 DOI: 10.1016/j.actbio.2019.07.032] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 07/18/2019] [Accepted: 07/18/2019] [Indexed: 01/09/2023]
Abstract
An ideal cell source for human therapeutic and disease modeling applications should be easily accessible and possess unlimited differentiation and expansion potential. Human induced pluripotent stem cells (hiPSCs) derived from peripheral blood mononuclear cells (PBMCs) represent a promising source given their ease of harvest and their pluripotent nature. Previous studies have demonstrated the feasibility of using PBMC-derived hiPSCs for vascular tissue engineering. However, so far, no endothelialization of hiPSC-derived tissue engineered vascular grafts (TEVGs) based on fully biodegradable polymers without xenogenic matrix components has been shown. In this study, we have generated hiPSCs from PBMCs and differentiated them into αSMA- and calponin-positive smooth muscle cells (SMCs) as well as endothelial cells (ECs) positive for CD31, vWF and eNOS. Both cell types were co-seeded on PGA-P4HB starter matrices and cultured under static or dynamic conditions to induce tissue formation in vitro. The resulting small diameter vascular grafts showed abundant amounts of extracellular matrix, containing a thin luminal layer of vWF-positive cells and a subendothelial αSMA-positive layer approximating the architecture of native vessels. Our results demonstrate the successful generation of TEVGs based on SMCs and ECs differentiated from PBMC-derived hiPSC combined with a biodegradable polymer. These results pave the way for developing autologous PBMC-derived hiPSC-based vascular constructs for therapeutic applications or disease modeling. STATEMENT OF SIGNIFICANCE: We report for the first time the possibility to employ human peripheral blood mononuclear cell (PBMC)-derived iPSCs to generate biodegradable polymer-based tissue engineered vascular grafts (TEVG), which mimic the native layered architecture of blood vessels. hiPSCs from PBMCs were differentiated into smooth muscle cells as well as endothelial cells. These cells were co-seeded on a biodegradable PGA/P4HB scaffold and cultured in a bioreactor to induce tissue formation in vitro. The resulting small diameter TEVG showed abundant amounts of extracellular matrix, containing a αSMA-positive layer in the interstitium and a thin luminal layer of vWF-positive endothelial cells approximating the architecture of native vessels. Our findings improving the generation of autologous vascular replacements using blood as an easily accessible cell source.
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Affiliation(s)
- Melanie Generali
- Institute for Regenerative Medicine (IREM), Center for Therapy Development and Good Manufacturing Practice, University of Zurich, Zurich, Switzerland.
| | - Elisa A Casanova
- Division of Trauma Surgery, Center for Clinical Research, University Hospital Zurich, University of Zurich, Zurich, Switzerland.
| | - Debora Kehl
- Institute for Regenerative Medicine (IREM), Center for Therapy Development and Good Manufacturing Practice, University of Zurich, Zurich, Switzerland.
| | - Debora Wanner
- Institute for Regenerative Medicine (IREM), Center for Therapy Development and Good Manufacturing Practice, University of Zurich, Zurich, Switzerland.
| | - Simon P Hoerstrup
- Institute for Regenerative Medicine (IREM), Center for Therapy Development and Good Manufacturing Practice, University of Zurich, Zurich, Switzerland; Center for Applied Biotechnology and Molecular Medicine (CABMM), University of Zurich, Zurich, Switzerland; Wyss Zurich, University of Zurich and ETH Zurich, Zurich, Switzerland.
| | - Paolo Cinelli
- Division of Trauma Surgery, Center for Clinical Research, University Hospital Zurich, University of Zurich, Zurich, Switzerland; Center for Applied Biotechnology and Molecular Medicine (CABMM), University of Zurich, Zurich, Switzerland.
| | - Benedikt Weber
- Institute for Regenerative Medicine (IREM), Center for Therapy Development and Good Manufacturing Practice, University of Zurich, Zurich, Switzerland; Center for Applied Biotechnology and Molecular Medicine (CABMM), University of Zurich, Zurich, Switzerland; Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, Zurich, Switzerland.
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7
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Ukita R, Wu K, Lin X, Carleton NM, Naito N, Lai A, Do-Nguyen CC, Demarest CT, Jiang S, Cook KE. Zwitterionic poly-carboxybetaine coating reduces artificial lung thrombosis in sheep and rabbits. Acta Biomater 2019; 92:71-81. [PMID: 31082571 PMCID: PMC6633914 DOI: 10.1016/j.actbio.2019.05.019] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 04/30/2019] [Accepted: 05/07/2019] [Indexed: 12/24/2022]
Abstract
Current artificial lungs fail in 1-4 weeks due to surface-induced thrombosis. Biomaterial coatings may be applied to anticoagulate artificial surfaces, but none have shown marked long-term effectiveness. Poly-carboxybetaine (pCB) coatings have shown promising results in reducing protein and platelet-fouling in vitro. However, in vivo hemocompatibility remains to be investigated. Thus, three different pCB-grafting approaches to artificial lung surfaces were first investigated: 1) graft-to approach using 3,4-dihydroxyphenylalanine (DOPA) conjugated with pCB (DOPA-pCB); 2) graft-from approach using the Activators ReGenerated by Electron Transfer method of atom transfer radical polymerization (ARGET-ATRP); and 3) graft-to approach using pCB randomly copolymerized with hydrophobic moieties. One device coated with each of these methods and one uncoated device were attached in parallel within a veno-venous sheep extracorporeal circuit with no continuous anticoagulation (N = 5 circuits). The DOPA-pCB approach showed the least increase in blood flow resistance and the lowest incidence of device failure over 36-hours. Next, we further investigated the impact of tip-to-tip DOPA-pCB coating in a 4-hour rabbit study with veno-venous micro-artificial lung circuit at a higher activated clotting time of 220-300 s (N ≥ 5). Here, DOPA-pCB reduced fibrin formation (p = 0.06) and gross thrombus formation by 59% (p < 0.05). Therefore, DOPA-pCB is a promising material for improving the anticoagulation of artificial lungs. STATEMENT OF SIGNIFICANCE: Chronic lung diseases lead to 168,000 deaths each year in America, but only 2300 lung transplantations happen each year. Hollow fiber membrane oxygenators are clinically used as artificial lungs to provide respiratory support for patients, but their long-term viability is hindered by surface-induced clot formation that leads to premature device failure. Among different coatings investigated for blood-contacting applications, poly-carboxybetaine (pCB) coatings have shown remarkable reduction in protein adsorption in vitro. However, their efficacy in vivo remains unclear. This is the first work that investigates various pCB-coating methods on artificial lung surfaces and their biocompatibility in sheep and rabbit studies. This work highlights the promise of applying pCB coatings on artificial lungs to extend its durability and enable long-term respiratory support for lung disease patients.
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Affiliation(s)
- Rei Ukita
- Department of Biomedical Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Scott Hall 4(th) Floor, Pittsburgh, PA 15213, USA.
| | - Kan Wu
- Department of Chemical Engineering, University of Washington, Box 351750, Seattle, WA 98195-1750, USA
| | - Xiaojie Lin
- Department of Chemical Engineering, University of Washington, Box 351750, Seattle, WA 98195-1750, USA
| | - Neil M Carleton
- Department of Biomedical Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Scott Hall 4(th) Floor, Pittsburgh, PA 15213, USA
| | - Noritsugu Naito
- Department of Biomedical Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Scott Hall 4(th) Floor, Pittsburgh, PA 15213, USA
| | - Angela Lai
- Department of Biomedical Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Scott Hall 4(th) Floor, Pittsburgh, PA 15213, USA
| | - Chi Chi Do-Nguyen
- Department of Biomedical Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Scott Hall 4(th) Floor, Pittsburgh, PA 15213, USA
| | - Caitlin T Demarest
- Department of Biomedical Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Scott Hall 4(th) Floor, Pittsburgh, PA 15213, USA
| | - Shaoyi Jiang
- Department of Chemical Engineering, University of Washington, Box 351750, Seattle, WA 98195-1750, USA
| | - Keith E Cook
- Department of Biomedical Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Scott Hall 4(th) Floor, Pittsburgh, PA 15213, USA
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8
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Shitole AA, Giram PS, Raut PW, Rade PP, Khandwekar AP, Sharma N, Garnaik B. Clopidogrel eluting electrospun polyurethane/polyethylene glycol thromboresistant, hemocompatible nanofibrous scaffolds. J Biomater Appl 2019; 33:1327-1347. [DOI: 10.1177/0885328219832984] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Biomaterials used as blood-contacting material must be hemocompatible and exhibit lower thrombotic potential while maintaining hemostasis and angiogenesis. With the aim of developing thromboresistant, hemocompatible nanofibrous scaffolds, polyurethane/polyethylene glycol scaffolds incorporated with 1, 5, and 10 wt% Clopidogrel were fabricated and evaluated for their physiochemical properties, biocompatibility, hemocompatibility, and antithrombotic potential. The results of physicochemical characterization revealed the fabrication of nanometer-sized scaffolds with smooth surfaces. The incorporation of both polyethylene glycol and Clopidogrel to polyurethane enhanced the hydrophilicity and water uptake potential of polyurethane/polyethylene glycol/Clopidogrel scaffolds. The dynamic mechanical analysis revealed the enhancement in mechanical strength of the polyurethane/polyethylene glycol scaffolds on incorporation of Clopidogrel. The polyurethane/polyethylene glycol/Clopidogrel scaffolds showed a tri-phasic drug release pattern. The results of hemocompatibility assessment demonstrated the excellent blood compatibility of the polyurethane/polyethylene glycol/Clopidogrel scaffolds, with the developed scaffolds exhibiting lower hemolysis, increased albumin and plasma protein adsorption while reduction in fibrinogen adsorption. Further, the platelet adhesion was highly suppressed and significant increase in coagulation period was observed for Clopidogrel incorporated scaffolds. The results of cell adhesion and cell viability substantiate the biocompatibility of the developed nanofibrous scaffolds with the HUVEC cell viability on polyurethane/polyethylene glycol, polyurethane/polyethylene glycol/Clopidogrel-1, 5, and 10% at day 7 found to be 12.35, 13.36, 14.85, and 4.18% higher as compared to polyurethane scaffolds, and the NIH/3T3 cell viability found to be 35.27, 70.82, 36.60, and 7.95% higher as compared to polyurethane scaffolds, respectively. Altogether the results of the study advocate the incorporation of Clopidogrel to the polyurethane/polyethylene glycol blend in order to fabricate scaffolds with appropriate antithrombotic property, hemocompatibility, and cell proliferation capacity and thus, might be successfully used as antithrombotic material for biomedical application.
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Affiliation(s)
- Ajinkya A Shitole
- Symbiosis School of Biological Sciences, Symbiosis International (Deemed University), Pune, India
| | - Prabhanjan S Giram
- Polymer Science and Engineering Division, CSIR- National Chemical Laboratory, Pune, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, India
| | - Piyush W Raut
- Symbiosis School of Biological Sciences, Symbiosis International (Deemed University), Pune, India
| | - Priyanka P Rade
- Polymer Science and Engineering Division, CSIR- National Chemical Laboratory, Pune, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, India
| | - Anand P Khandwekar
- School of Engineering, Ajeenkya DY Patil University (ADYPU), Pune, India
| | - Neeti Sharma
- Symbiosis School of Biological Sciences, Symbiosis International (Deemed University), Pune, India
| | - Baijayantimala Garnaik
- Polymer Science and Engineering Division, CSIR- National Chemical Laboratory, Pune, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, India
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9
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Pocivavsek L, Ye SH, Pugar J, Tzeng E, Cerda E, Velankar S, Wagner WR. Active wrinkles to drive self-cleaning: A strategy for anti-thrombotic surfaces for vascular grafts. Biomaterials 2019; 192:226-234. [PMID: 30458358 PMCID: PMC7248685 DOI: 10.1016/j.biomaterials.2018.11.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 10/24/2018] [Accepted: 11/03/2018] [Indexed: 12/16/2022]
Abstract
The inner surfaces of arteries and veins are naturally anti-thrombogenic, whereas synthetic materials placed in blood contact commonly experience thrombotic deposition that can lead to device failure or clinical complications. Presented here is a bioinspired strategy for self-cleaning anti-thrombotic surfaces using actuating surface topography. As a first test, wrinkled polydimethylsiloxane planar surfaces are constructed that can repeatedly transition between smooth and wrinkled states. When placed in contact with blood, these surfaces display markedly less platelet deposition than control samples. Second, for the specific application of prosthetic vascular grafts, the potential of using pulse pressure, i.e. the continual variation of blood pressure between systole and diastole, to drive topographic actuation was investigated. Soft cylindrical tubes with a luminal surface that transitioned between smooth and wrinkled states were constructed. Upon exposure to blood under continual pressure pulsation, these cylindrical tubes also showed reduced platelet deposition versus control samples under the same fluctuating pressure conditions. In both planar and cylindrical cases, significant reductions in thrombotic deposition were observed, even when the wrinkles had wavelengths of several tens of μm, far larger than individual platelets. We speculate that the observed thrombo-resistance behavior is attributable to a biofilm delamination process in which the bending energy within the biofilm overcomes interfacial adhesion. This novel strategy to reduce thrombotic deposition may be applicable to several types of medical devices placed into the circulatory system, particularly vascular grafts.
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Affiliation(s)
- Luka Pocivavsek
- Department of Surgery, The University of Chicago, Chicago, IL, 60637, USA.
| | - Sang-Ho Ye
- Department of Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, 15213, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Joseph Pugar
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - Edith Tzeng
- Department of Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, 15213, USA
| | - Enrique Cerda
- Department of Physics, Universidad de Santiago de Chile, Santiago, Chile
| | - Sachin Velankar
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, PA, 15213, USA; Department of Mechanical Engineering, University of Pittsburgh, Pittsburgh, PA, 15213, USA.
| | - William R Wagner
- Department of Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, 15213, USA; Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, PA, 15213, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
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10
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Abstract
Toward improving implantable medical devices as well as diagnostic performance, the development of polymeric biomaterials having resistance to proteins remains a priority. Herein, we highlight key strategies reported in the recent literature that have relied upon improvement of surface hydrophilicity via direct surface modification methods or with bulk modification using surface modifying additives (SMAs). These approaches have utilized a variety of techniques to incorporate the surface hydrophilization agent, including physisorption, hydrogel network formation, surface grafting, layer-by-layer (LbL) assembly and blending base polymers with SMAs. While poly(ethylene glycol) (PEG) remains the gold standard, new alternatives have emerged such as polyglycidols, poly(2-oxazoline)s (POx), polyzwitterions, and amphiphilic block copolymers. While these new strategies provide encouraging results, the need for improved correlation between in vitro and in vivo protein resistance is critical. This may be achieved by employing complex protein solutions as well as strides to enhance the sensitivity of protein adsorption measurements.
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Affiliation(s)
- Bryan Khai D. Ngo
- Department of Biomedical Engineering and ‡Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Melissa A. Grunlan
- Department of Biomedical Engineering and ‡Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
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11
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Hawkins ML, Schott SS, Grigoryan B, Rufin MA, Ngo BKD, Vanderwal L, Stafslien SJ, Grunlan MA. Anti-protein and anti-bacterial behavior of amphiphilic silicones. Polym Chem 2017; 8:5239-5251. [PMID: 29104619 PMCID: PMC5667680 DOI: 10.1039/c7py00944e] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Silicones with improved water-driven surface hydrophilicity and anti-biofouling behavior were achieved when bulk-modified with poly(ethylene oxide) (PEO) -silane amphiphiles of varying siloxane tether length: α-(EtO)3Si-(CH2)2-oligodimethylsiloxane m -block-poly(ethylene oxide)8-OCH3 (m = 0, 4, 13, 17, 24, and 30). A PEO8-silane [α-(EtO)3Si-(CH2)3-PEO8-OCH3] served as a conventional PEO-silane control. To examine anti-biofouling behavior in the absence versus presence of water-driven surface restructuring, the amphiphiles and control were surface-grafted onto silicon wafers and used to bulk-modify a medical-grade silicone, respectively. While the surface-grafted PEO-control exhibited superior protein resistance, it failed to appreciably restructure to the surface-water interface of bulk-modified silicone and thus led to poor protein resistance. In contrast, the PEO-silane amphiphiles, while less protein-resistant when surface-grafted onto silicon wafers, rapidly and substantially restructured in bulk-modified silicone, exhibiting superior hydrophilicity and protein resistance. A reduction of biofilm for several strains of bacteria and a fungus was observed for silicones modified with PEO-silane amphiphiles. Longer siloxane tethers maintained surface restructuring and protein resistance while displaying the added benefit of increased transparency.
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Affiliation(s)
- Melissa L Hawkins
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843-3120
| | - Samantha S Schott
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843-3120
| | - Bagrat Grigoryan
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843-3120
| | - Marc A Rufin
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843-3120
| | - Bryan Khai D Ngo
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843-3120
| | - Lyndsi Vanderwal
- Office of Research & Creative Activity, North Dakota State University, Fargo, ND 58102
| | - Shane J Stafslien
- Office of Research & Creative Activity, North Dakota State University, Fargo, ND 58102
| | - Melissa A Grunlan
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843-3120
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843-300
- Center for Remote Health Technologies System, Texas A&M University, College Station, TX 77843-3120
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12
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Rufin MA, Ngo BKD, Barry ME, Page VM, Hawkins ML, Stafslien SJ, Grunlan MA. Antifouling silicones based on surface-modifying additive amphiphiles. GREEN MATERIALS 2017; 5:4-13. [PMID: 31673356 PMCID: PMC6822677 DOI: 10.1680/jgrma.16.00013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Surface modifying additives (SMAs), which may be readily blended into silicones to improve anti-fouling behavior, must have excellent surface migration potential and must not leach into the aqueous environment. In this work, we evaluated the efficacy of a series of poly(ethylene oxide) (PEO)-based SMA amphiphiles which varied in terms of crosslinkability, siloxane tether length (m) and diblock versus triblock architectures. Specifically, crosslinkable, diblock PEO-silane amphiphiles with two oligodimethylsiloxane (ODMS) tether lengths [(EtO)3Si-(CH2)3-ODMS m -PEO8, m = 13 and 30] were compared to analogous non-crosslinkable, diblock (H-Si-ODMS m -PEO8) and triblock (PEO8-ODMS m -PEO8) SMAs. Prior to water conditioning, while all modified silicone coatings exhibited a high degree of water-driven surface restructuring, that prepared with the non-crosslinkable diblock SMA (m = 13) was the most hydrophilic. After conditioning, all modified silicone coatings were similarly hydrophilic and remained highly protein resistant, with the exception of PEO8-ODMS 30 -PEO8. Notably, despite twice the PEO content, triblock SMAs were not superior to diblock SMAs. For diblock SMAs, it was shown that water uptake and leaching were also similar whether or not the SMA was crosslinkable.
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Affiliation(s)
- Marc A Rufin
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
| | - Bryan Khai D Ngo
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
| | - Mikayla E Barry
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
| | - Vanessa M Page
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
| | - Melissa L Hawkins
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
| | - Shane J Stafslien
- Center for Nanoscale Science and Engineering, North Dakota State University, Fargo, ND, USA
| | - Melissa A Grunlan
- Department of Biomedical Engineering and Department of Materials Science and Engineering, Texas A&M University, College Station, TX, USA, 5030 Emerging Technologies Building, College Station, TX 77843-3120
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13
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Rufin MA, Barry ME, Adair PA, Hawkins ML, Raymond JE, Grunlan MA. Protein resistance efficacy of PEO-silane amphiphiles: Dependence on PEO-segment length and concentration. Acta Biomater 2016; 41:247-52. [PMID: 27090588 PMCID: PMC5106186 DOI: 10.1016/j.actbio.2016.04.020] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 04/06/2016] [Accepted: 04/13/2016] [Indexed: 10/21/2022]
Abstract
UNLABELLED In contrast to modification with conventional PEO-silanes (i.e. no siloxane tether), silicones with dramatically enhanced protein resistance have been previously achieved via bulk-modification with poly(ethylene oxide) (PEO)-silane amphiphiles α-(EtO)3Si(CH2)2-oligodimethylsiloxane13-block-PEOn-OCH3 when n=8 and 16 but not when n=3. In this work, their efficacy was evaluated in terms of optimal PEO-segment length and minimum concentration required in silicone. For each PEO-silane amphiphile (n=3, 8, and 16), five concentrations (5, 10, 25, 50, and 100μmol per 1g silicone) were evaluated. Efficacy was quantified in terms of the modified silicones' abilities to undergo rapid, water-driven surface restructuring to form hydrophilic surfaces as well as resistance to fibrinogen adsorption. Only n=8 and 16 were effective, with a lower minimum concentration in silicone required for n=8 (10μmol per 1g silicone) versus n=16 (25μmol per 1g silicone). STATEMENT OF SIGNIFICANCE Silicone is commonly used for implantable medical devices, but its hydrophobic surface promotes protein adsorption which leads to thrombosis and infection. Typical methods to incorporate poly(ethylene oxide) (PEO) into silicones have not been effective due to the poor migration of PEO to the surface-biological interface. In this work, PEO-silane amphiphiles - comprised of a siloxane tether (m=13) and variable PEO segment lengths (n=3, 8, 16) - were blended into silicone to improve its protein resistance. The efficacy of the amphiphiles was determined to be dependent on PEO length. With the intermediate PEO length (n=8), water-driven surface restructuring and resulting protein resistance was achieved with a concentration of only 1.7wt%.
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Affiliation(s)
- Marc A Rufin
- Department of Biomedical Engineering, Texas A&M University, United States
| | - Mikayla E Barry
- Department of Biomedical Engineering, Texas A&M University, United States
| | - Paige A Adair
- Department of Biomedical Engineering, Texas A&M University, United States
| | - Melissa L Hawkins
- Department of Biomedical Engineering, Texas A&M University, United States
| | | | - Melissa A Grunlan
- Department of Biomedical Engineering, Texas A&M University, United States; Department of Materials Science and Engineering, Texas A&M University, United States.
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14
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van Almen GC, Talacua H, Ippel BD, Mollet BB, Ramaekers M, Simonet M, Smits AIPM, Bouten CVC, Kluin J, Dankers PYW. Development of Non-Cell Adhesive Vascular Grafts Using Supramolecular Building Blocks. Macromol Biosci 2015; 16:350-62. [DOI: 10.1002/mabi.201500278] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 10/08/2015] [Indexed: 11/08/2022]
Affiliation(s)
- Geert C. van Almen
- Department of Biomedical Engineering; Laboratory of Chemical Biology, and Institute for Complex Molecular Systems; Eindhoven University of Technology; P.O. Box 513 5600 MB Eindhoven The Netherlands
| | - Hanna Talacua
- Department of Cardio-Thoracic Surgery; University Medical Center Utrecht; 3584 CX Utrecht The Netherlands
| | - Bastiaan D. Ippel
- Department of Biomedical Engineering; Laboratory of Chemical Biology, and Institute for Complex Molecular Systems; Eindhoven University of Technology; P.O. Box 513 5600 MB Eindhoven The Netherlands
| | - Björne B. Mollet
- Department of Biomedical Engineering; Laboratory of Chemical Biology, and Institute for Complex Molecular Systems; Eindhoven University of Technology; P.O. Box 513 5600 MB Eindhoven The Netherlands
| | - Mellany Ramaekers
- Department of Biomedical Engineering; Laboratory of Chemical Biology, and Institute for Complex Molecular Systems; Eindhoven University of Technology; P.O. Box 513 5600 MB Eindhoven The Netherlands
| | - Marc Simonet
- Department of Biomedical Engineering; Soft Tissue Biomechanics and Tissue Engineering and Institute for Complex Molecular Systems; Eindhoven University of Technology; P.O. Box 513 5600 MB Eindhoven The Netherlands
| | - Anthal I. P. M. Smits
- Department of Biomedical Engineering; Soft Tissue Biomechanics and Tissue Engineering and Institute for Complex Molecular Systems; Eindhoven University of Technology; P.O. Box 513 5600 MB Eindhoven The Netherlands
| | - Carlijn V. C. Bouten
- Department of Biomedical Engineering; Soft Tissue Biomechanics and Tissue Engineering and Institute for Complex Molecular Systems; Eindhoven University of Technology; P.O. Box 513 5600 MB Eindhoven The Netherlands
| | - Jolanda Kluin
- Department of Cardio-Thoracic Surgery; University Medical Center Utrecht; 3584 CX Utrecht The Netherlands
| | - Patricia Y. W. Dankers
- Department of Biomedical Engineering; Laboratory of Chemical Biology, and Institute for Complex Molecular Systems; Eindhoven University of Technology; P.O. Box 513 5600 MB Eindhoven The Netherlands
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15
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Pacelli S, Manoharan V, Desalvo A, Lomis N, Jodha KS, Prakash S, Paul A. Tailoring biomaterial surface properties to modulate host-implant interactions: implication in cardiovascular and bone therapy. J Mater Chem B 2015; 4:1586-1599. [PMID: 27630769 PMCID: PMC5019489 DOI: 10.1039/c5tb01686j] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Host body response to a foreign medical device plays a critical role in defining its fate post implantation. It is thus important to control host-material interactions by designing innovative implant surfaces. In the recent years, biochemical and topographical features have been explored as main target to produce this new type of bioinert or bioresponsive implants. The review discusses specific biofunctional materials and strategies to achieve a precise control over implant surface properties and presents possible solutions to develop next generation of implants, particularly in the fields of bone and cardiovascular therapy.
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Affiliation(s)
- Settimio Pacelli
- BioIntel Research Laboratory, Department of Chemical and Petroleum Engineering, Bioengineering Graduate Program, School of Engineering, University of Kansas, Lawrence, KS, USA
| | - Vijayan Manoharan
- BioIntel Research Laboratory, Department of Chemical and Petroleum Engineering, Bioengineering Graduate Program, School of Engineering, University of Kansas, Lawrence, KS, USA
| | - Anna Desalvo
- University of Southampton, School of Medicine, University Road, Southampton SO17 1BJ, United Kingdom
| | - Nikita Lomis
- Biomedical Technology and Cell Therapy Research Laboratory, Department of Biomedical Engineering, Faculty of Medicine, Duff Medical Building, 3775 University Street, McGill University, QC, Canada H3A 2B4
| | - Kartikeya Singh Jodha
- BioIntel Research Laboratory, Department of Chemical and Petroleum Engineering, Bioengineering Graduate Program, School of Engineering, University of Kansas, Lawrence, KS, USA
| | - Satya Prakash
- Biomedical Technology and Cell Therapy Research Laboratory, Department of Biomedical Engineering, Faculty of Medicine, Duff Medical Building, 3775 University Street, McGill University, QC, Canada H3A 2B4
| | - Arghya Paul
- BioIntel Research Laboratory, Department of Chemical and Petroleum Engineering, Bioengineering Graduate Program, School of Engineering, University of Kansas, Lawrence, KS, USA
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16
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Rufin MA, Gruetzner JA, Hurley MJ, Hawkins ML, Raymond ES, Raymond JE, Grunlan MA. Enhancing the protein resistance of silicone via surface-restructuring PEO-silane amphiphiles with variable PEO length. J Mater Chem B 2015; 3:2816-2825. [PMID: 26339488 PMCID: PMC4554761 DOI: 10.1039/c4tb02042a] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Silicones with superior protein resistance were produced by bulk-modification with poly(ethylene oxide) (PEO)-silane amphiphiles that demonstrated a higher capacity to restructure to the surface-water interface versus conventional non-amphiphilic PEO-silanes. The PEO-silane amphiphiles were prepared with a single siloxane tether length but variable PEO segment lengths: α-(EtO)3Si(CH2)2-oligodimethylsiloxane13-block-poly(ethylene oxide) n -OCH3 (n = 3, 8, and 16). Conventional PEO-silane analogues (n = 3, 8 and 16) as well as a siloxane tether-silane (i.e. no PEO segment) were prepared as controls. When surface-grafted onto silicon wafer, PEO-silane amphiphiles produced surfaces that were more hydrophobic and thus more adherent towards fibrinogen versus the corresponding PEO-silane. However, when blended into a silicone, PEO-silane amphiphiles exhibited rapid restructuring to the surface-water interface and excellent protein resistance whereas the PEO-silanes did not. Silicones modified with PEO-silane amphiphiles of PEO segment lengths n = 8 and 16 achieved the highest protein resistance.
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Affiliation(s)
- M. A. Rufin
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843-3120
| | - J. A. Gruetzner
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843-3120
| | - M. J. Hurley
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843-3120
| | - M. L. Hawkins
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843-3120
| | - E. S. Raymond
- Department of Neuroscience and Experimental Therapeutics, Texas A&M University, College Station, TX 77843-3120
| | - J. E. Raymond
- Department of Chemistry, Texas A&M University, College Station, TX 77843-3120
| | - M. A. Grunlan
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843-3120
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843-3120
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17
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Stafslien SJ, Christianson D, Daniels J, VanderWal L, Chernykh A, Chisholm BJ. Combinatorial materials research applied to the development of new surface coatings XVI: fouling-release properties of amphiphilic polysiloxane coatings. BIOFOULING 2015; 31:135-149. [PMID: 25647177 DOI: 10.1080/08927014.2014.1003295] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
High-throughput methods were used to prepare and characterize the fouling-release (FR) properties of an array of amphiphilic polysiloxane-based coatings possessing systematic variations in composition. The coatings were derived from a silanol-terminated polydimethylsiloxane, a silanol-terminated polytrifluorpropylmethylsiloxane (CF3-PDMS), 2-[methoxy(polyethyleneoxy)propyl]-trimethoxysilane (TMS-PEG), methyltriacetoxysilane and hexamethyldisilazane-treated fumed silica. The variables investigated were the concentration of TMS-PEG and the concentration of CF3-PDMS. In general, it was found that the TMS-PEG and the CF3-PDMS had a synergist effect on FR properties with these properties being enhanced by combining both compounds into the coating formulations. In addition, reattached adult barnacles removed from coatings possessing both TMS-PEG and relatively high levels of CF3-PDMS displayed atypical base-plate morphologies. The majority of the barnacles removed from these coatings exhibited a cupped or domed base-plate as compared to the flat base-plate observed for the control coating that did not contain TMS-PEG or CF3-PDMS. Coating surface analysis using water contact angle measurements indicated that the presence of CF3-PDMS facilitated migration of TMS-PEG to the coating/air interface during the film formation/curing process. In general, coatings containing both TMS-PEG and relatively high levels of CF3-PDMS possessed excellent FR properties.
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Affiliation(s)
- Shane J Stafslien
- a Center for Nanoscale Science and Engineering , North Dakota State University , Fargo , USA
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18
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Ruiz A, Rathnam KR, Masters KS. Effect of hyaluronic acid incorporation method on the stability and biological properties of polyurethane-hyaluronic acid biomaterials. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2014; 25:487-498. [PMID: 24276670 PMCID: PMC3945677 DOI: 10.1007/s10856-013-5092-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Accepted: 11/09/2013] [Indexed: 06/02/2023]
Abstract
The high failure rate of small diameter vascular grafts continues to drive the development of new materials and modification strategies that address this clinical problem, with biomolecule incorporation typically achieved via surface-based modification of various biomaterials. In this work, we examined whether the method of biomolecule incorporation (i.e., bulk versus surface modification) into a polyurethane (PU) polymer impacted biomaterial performance in the context of vascular applications. Specifically, hyaluronic acid (HA) was incorporated into a poly(ether urethane) via bulk copolymerization or covalent surface tethering, and the resulting PU-HA materials characterized with respect to both physical and biological properties. Modification of PU with HA by either surface or bulk methods yielded materials that, when tested under static conditions, possessed no significant differences in their ability to resist protein adsorption, platelet adhesion, and bacterial adhesion, while supporting endothelial cell culture. However, only bulk-modified PU-HA materials were able to fully retain these characteristics following material exposure to flow, demonstrating a superior ability to retain the incorporated HA and minimize enzymatic degradation, protein adsorption, platelet adhesion, and bacterial adhesion. Thus, despite bulk methods rarely being implemented in the context of biomolecule attachment, these results demonstrate improved performance of PU-HA upon bulk, rather than surface, incorporation of HA. Although explored only in the context of PU-HA, the findings revealed by these experiments have broader implications for the design and evaluation of vascular graft modification strategies.
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Affiliation(s)
- Amaliris Ruiz
- Materials Science Program, University of Wisconsin, Madison, Wisconsin
| | | | - Kristyn S. Masters
- Materials Science Program, University of Wisconsin, Madison, Wisconsin
- Department of Biomedical Engineering, University of Wisconsin, Madison, Wisconsin
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19
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Conn G, Kidane AG, Punshon G, Kannan RY, Hamilton G, Seifalian AM. Is there an alternative to systemic anticoagulation, as related to interventional biomedical devices? Expert Rev Med Devices 2014; 3:245-61. [PMID: 16515390 DOI: 10.1586/17434440.3.2.245] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
To reduce the toxic effects, related clinical problems and complications such as bleeding disorders associated with systemic anticoagulation, it has been hypothesized that by coating the surfaces of medical devices, such as stents, bypass grafts, extracorporeal circuits, guide wires and catheters, there will be a significant reduction in the requirement for systemic anticoagulation or, ideally, it will no longer be necessary. However, current coating processes, even covalent ones, still result in leaching followed by reduced functionality. Alternative anticoagulants and related antiplatelet agents have been used for improvement in terms of reduced restenosis, intimal hyperphasia and device failure. This review focuses on existing heparinization processes, their application in clinical devices and the updated list of alternatives to heparinization in order to obtain a broad overview, it then highlights, in particular, the future possibilities of using heparin and related moieties to tissue engineer scaffolds.
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Affiliation(s)
- Gemma Conn
- Biomaterials & Tissue Engineering Centre, Academic Division of Surgical and Interventional Sciences, University College London, Rowland Hill Street, Hampstead, London NW3 2PF, UK
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20
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Heintz K, Schilke KF, Snider J, Lee WK, Truong M, Coblyn M, Jovanovic G, McGuire J. Preparation and evaluation of PEO-coated materials for a microchannel hemodialyzer. J Biomed Mater Res B Appl Biomater 2013; 102:1014-20. [DOI: 10.1002/jbm.b.33082] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Revised: 08/14/2013] [Accepted: 11/19/2013] [Indexed: 11/11/2022]
Affiliation(s)
- Keely Heintz
- School of Chemical, Biological and Environmental Engineering, Oregon State University; Corvallis Oregon 97331
| | - Karl F. Schilke
- School of Chemical, Biological and Environmental Engineering, Oregon State University; Corvallis Oregon 97331
| | - Joshua Snider
- School of Chemical, Biological and Environmental Engineering, Oregon State University; Corvallis Oregon 97331
| | - Woo-Kul Lee
- School of Chemical, Biological and Environmental Engineering, Oregon State University; Corvallis Oregon 97331
| | - Mitchell Truong
- School of Chemical, Biological and Environmental Engineering, Oregon State University; Corvallis Oregon 97331
| | - Matthew Coblyn
- School of Chemical, Biological and Environmental Engineering, Oregon State University; Corvallis Oregon 97331
| | - Goran Jovanovic
- School of Chemical, Biological and Environmental Engineering, Oregon State University; Corvallis Oregon 97331
| | - Joseph McGuire
- School of Chemical, Biological and Environmental Engineering, Oregon State University; Corvallis Oregon 97331
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21
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Kohavi D, Badihi L, Rosen G, Steinberg D, Sela MN. An in vivo method for measuring the adsorption of plasma proteins to titanium in humans. BIOFOULING 2013; 29:1215-1224. [PMID: 24088083 DOI: 10.1080/08927014.2013.834332] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A novel method of collecting in vivo plasma proteins of humans from osteotomies prepared during insertion of an oral implant is described. A rod containing a collecting portion with a predetermined surface is introduced into the osteomy, removed, and transferred for enzyme-linked immunosorbent assay analysis. Two experiments were used to examine the feasibility of the method. In the first, titanium (Ti) rods with different roughness were exposed for 10 min to the blood. Blasted and acid-etched surfaces adsorbed four times more and acid-etched surfaces adosorbed two times more plasma proteins as compared to machined surfaces. In the second experiment, blasted and acid-etched rods were wetted for 10 s prior to the insertion. The adsorption for fibronectin, albumin, fibrinogen, and IgG was enhanced significantly compared with nonwetted rods. These results are discussed in the light of previous methods used in studies on adsorption. Thus, use of the collecting instrument enables aspects of human plasma-implant interface to be studied in a more realistic manner.
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Affiliation(s)
- D Kohavi
- a Department of Oral Rehabilitation , The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University , Tel Aviv , Israel
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22
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Yau JW, Stafford AR, Liao P, Fredenburgh JC, Roberts R, Brash JL, Weitz JI. Corn trypsin inhibitor coating attenuates the prothrombotic properties of catheters in vitro and in vivo. Acta Biomater 2012; 8:4092-100. [PMID: 22824529 DOI: 10.1016/j.actbio.2012.07.019] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Revised: 06/21/2012] [Accepted: 07/13/2012] [Indexed: 11/18/2022]
Abstract
Catheters initiate coagulation by activating factor (f) XII, which can lead to catheter thrombosis. Fondaparinux, which only targets activated fX (fXa), is associated with more catheter thrombosis than heparin, which targets fXa and thrombin. To render catheters less thrombogenic and fondaparinux more effective, we examined whether coating catheters with corn trypsin inhibitor (CTI), which blocks fXIIa, attenuates catheter-induced clotting and promotes fondaparinux activity. Compared with unmodified catheters, CTI-coated catheters demonstrated (a) decreased adsorption of fibrinogen and fXII, (b) greater inhibition of fXIIa generated by catheter-induced autoactivation, (c) attenuated fXIIa-mediated activation of fXI and (d) longer plasma clotting times in the absence or presence of fondaparinux. In an accelerated catheter thrombosis model in rabbits, (a) the time to catheter occlusion was longer with CTI-coated catheters than with unmodified catheters and (b) an intravenous dose of fondaparinux that had no effect on the time to occlusion of unmodified catheters extended the time to occlusion of CTI-coated catheters. These findings support the concept that the prothrombotic activity of catheters reflects their capacity to activate fXII and identify CTI immobilization as a novel approach for rendering catheters and other blood-contacting medical devices less thrombogenic.
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Affiliation(s)
- Jonathan W Yau
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario, Canada
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23
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Irvine SA, Yun X, Venkatraman S. Anti-platelet and tissue engineering approaches to biomaterial blood compatibilization: how well have these been translated into the clinic? Drug Deliv Transl Res 2012; 2:384-97. [DOI: 10.1007/s13346-012-0077-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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24
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Direct imaging of the surface distribution of immobilized cleavable polyethylene oxide-polybutadiene-polyethylene oxide triblock surfactants by atomic force microscopy. SURF INTERFACE ANAL 2012. [DOI: 10.1002/sia.5168] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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25
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Xia B, Xie M, Yang B. Surface modification of ultrahigh molecular weight polyethylene by the poly(ethylene glycol)-grafted method and its effect on the adsorption of proteins and the adhesion of blood platelets. J Biomed Mater Res A 2012; 101:54-63. [DOI: 10.1002/jbm.a.34301] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Revised: 05/25/2012] [Accepted: 05/25/2012] [Indexed: 11/07/2022]
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26
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Shariatpanahi RE, Orang F, Emami SH, Naimi T. Cell growth on tissue-engineering scaffolds prepared by gamma irradiation grafting of N-vinyl-2-pyrrolidone onto polyvinyl alcohol. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 17:659-67. [PMID: 16892727 DOI: 10.1163/156856206777346322] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In the field of tissue engineering, promoting cell attachment and proliferation in polymer matrices is an attractive challenge for treating patients suffering from the loss or dysfunction of tissues or organs. In this study we have investigated the effect of grafting N-vinyl-2-pyrrolidone (NVP) by gamma irradiation onto polyvinyl alcohol (PVA), a highly hydrophilic and non-toxic material. PVA scaffolds were prepared by freeze-thaw and progen (glycerol) methods. In the first method, samples were freeze-thawed for three consecutive cycles at -25 degrees C (90 min) and room temperature (60 min); in the latter, 0-40% glycerol was used as progen. Gamma irradiation of the scaffolds in the presence of NVP was performed at different concentrations (2, 3, 4 and 6%) with 5, 10 and 15 kGy 60Co. The highest percentage of grafting was obtained at 4% NVP solution and 15 kGy. Cell attachment was optimal for the scaffolds prepared using freeze-thaw and glycerol methods with 3.8% and 2.7% polyvinyl pyrrolidone (PVP), respectively.
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Affiliation(s)
- Ramineh E Shariatpanahi
- Department of Biomedical Engineering, Amirkabir University of Technology, Tehran 15875-4413, Iran.
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27
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Feng W, Gao X, McClung G, Zhu S, Ishihara K, Brash JL. Methacrylate polymer layers bearing poly(ethylene oxide) and phosphorylcholine side chains as non-fouling surfaces: in vitro interactions with plasma proteins and platelets. Acta Biomater 2011; 7:3692-9. [PMID: 21693202 DOI: 10.1016/j.actbio.2011.06.007] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Revised: 06/02/2011] [Accepted: 06/07/2011] [Indexed: 11/28/2022]
Abstract
Two methacrylate monomers, oligo(ethylene glycol) methyl ether methacrylate (OEGMA; MW=300 g mol(-1), poly(ethylene glycol) (PEG) side chains of average length n=4.5) and 2-methacryloyloxyethyl phosphorylcholine (MPC; MW=295 g mol(-1)), were grafted from silicon wafer surfaces via surface-initiated atom transfer radical polymerization. The grafted surfaces were used as model PEG and phosphorylcholine surface systems to allow comparison of the effectiveness of these two motifs in the prevention of plasma protein adsorption and platelet adhesion. It was found that at high graft density fibrinogen adsorption from plasma on the poly(MPC) and poly(OEGMA) surfaces for a given graft chain length was comparable and extremely low. At low graft density, poly(OEGMA) was slightly more effective than poly(MPC) in resisting fibrinogen adsorption from plasma. Flowing whole blood experiments showed that at low graft density the poly(OEGMA) surfaces were more resistant to fibrinogen adsorption and platelet adhesion than the poly(MPC) surfaces. At high graft density, both the poly(MPC) and poly(OEGMA) surfaces were highly resistant to fibrinogen and platelets. Immunoblots of proteins eluted from the surfaces after contact with human plasma were probed with antibodies against a range of proteins, including the contact phase clotting factors, fibrinogen, albumin, complement C3, IgG, vitronectin and apolipoprotein A-I. The blot responses were weak on the poly(MPC) and poly(OEGMA) surfaces at low graft density and zero at high graft density, again indicating strongly protein resistant properties for these surfaces. Since the side chains of the poly(OEGMA) are about 50% greater in size than those of poly(MPC), the difference in protein resistance between the poly(MPC) and poly(OEGMA) surfaces at low graft density may be due to the difference in surface coverage of the two graft types.
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Affiliation(s)
- Wei Feng
- Department of Chemical Engineering and School of Biomedical Engineering, McMaster University, Hamilton, ON, Canada L8P 4L7
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28
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Affiliation(s)
| | - Jeffrey J.D. Henry
- Department of Bioengineering, University of California, Berkeley, California 94720;
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29
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Luo LL, Wang GX, Li YL, Yin TY, Jiang T, Ruan CG. Layer-by-layer assembly of chitosan and platelet monoclonal antibody to improve biocompatibility and release character of PLLA coated stent. J Biomed Mater Res A 2011; 97:423-32. [DOI: 10.1002/jbm.a.33066] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2010] [Revised: 11/19/2010] [Accepted: 01/04/2011] [Indexed: 11/12/2022]
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30
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Schilke KF, McGuire J. Detection of nisin and fibrinogen adsorption on poly(ethylene oxide) coated polyurethane surfaces by time-of-flight secondary ion mass spectrometry (TOF-SIMS). J Colloid Interface Sci 2011; 358:14-24. [PMID: 21440897 DOI: 10.1016/j.jcis.2011.03.014] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2010] [Revised: 03/03/2011] [Accepted: 03/04/2011] [Indexed: 11/19/2022]
Abstract
Stable, pendant polyethylene oxide (PEO) layers were formed on medical-grade Pellethane® and Tygon® polyurethane surfaces, by adsorption and gamma-irradiation of PEO-polybutadiene-PEO triblock surfactants. Coated and uncoated polyurethanes were challenged individually or sequentially with nisin (a small polypeptide with antimicrobial activity) and/or fibrinogen, and then analyzed with time-of-flight secondary ion mass spectrometry (TOF-SIMS). Data reduction by robust principal components analysis (PCA) allowed detection of outliers, and distinguished adsorbed nisin and fibrinogen. Fibrinogen-contacted surfaces, with or without nisin, were very similar on uncoated polymer surfaces, consistent with nearly complete displacement or coverage of previously-adsorbed nisin by fibrinogen. In contrast, nisin-loaded PEO layers remained essentially unchanged upon challenge with fibrinogen, suggesting that the adsorbed nisin is stabilized within the pendant PEO layer, while the peptide-loaded PEO layer retains its ability to repel large proteins. Coatings of PEO loaded with therapeutic polypeptides on medical polymers have the potential to be used to produce anti-fouling and biofunctional surfaces for implantable or blood-contacting devices.
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Affiliation(s)
- Karl F Schilke
- School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR 97331, USA.
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31
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Szott LM, Horbett TA. The role of complement C3 and fibrinogen in monocyte adhesion to PEO-like plasma deposited tetraglyme. J Biomed Mater Res A 2010; 95:1252-60. [PMID: 20939050 PMCID: PMC2975874 DOI: 10.1002/jbm.a.32944] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2010] [Revised: 06/30/2010] [Accepted: 07/26/2010] [Indexed: 01/03/2023]
Abstract
The role of complement C3 in mediating adhesion of monocytes to plasma deposited tetraglyme surfaces was studied. Although fibrinogen (Fg) is usually considered the main factor in mediating phagocyte attachment, plasma deposited PEO-like tetraethylene glycol dimethyl ether (tetraglyme) coatings that have ultra-low Fg adsorption (<10 ng cm(-2)) from low concentration solutions and low monocyte adhesion in vitro still show high phagocyte adhesion after short implantations and later become encapsulated when tested in vivo. To test whether higher Fg adsorption under in vivo conditions could explain the higher in vivo reactivity, we again measured the resistance of tetraglyme films to Fg adsorption. We found a surprising and previously unreported increased amount of adsorbed Fg on tetraglyme surfaces from higher concentration protein solutions. However, monocyte adhesion to tetraglyme did not markedly increase despite the increased Fg adsorption. We thus suspected proteins other than Fg must be responsible for the increased in vivo reactivity. We found that on tetraglyme preadsorbed with C3-depleted serum, monocyte adhesion was greatly reduced as compared to samples adsorbed with normal serum. Addition of exogenous pure C3 to the serum used to preadsorb the surfaces restored monocyte adhesion to tetraglyme coatings. While Fg clearly plays an important role in mediating monocyte adhesion to tetraglyme surfaces, the results show an additional role for adsorbed C3 in monocyte adhesion.
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Affiliation(s)
- Luisa M. Szott
- Department of Bioengineering, University of Washington, Seattle, WA
| | - Thomas A. Horbett
- Department of Bioengineering, University of Washington, Seattle, WA
- Department of Chemical Engineering, University of Washington, Seattle, WA
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32
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Ryder MP, Schilke KF, Auxier JA, McGuire J, Neff JA. Nisin adsorption to polyethylene oxide layers and its resistance to elution in the presence of fibrinogen. J Colloid Interface Sci 2010; 350:194-9. [PMID: 20619847 PMCID: PMC2918692 DOI: 10.1016/j.jcis.2010.06.038] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2010] [Revised: 06/15/2010] [Accepted: 06/15/2010] [Indexed: 11/20/2022]
Abstract
The adsorption and elution of the antimicrobial peptide nisin at silanized silica surfaces coated to present pendant polyethylene oxide chains was detected in situ by zeta potential measurements. Silica microspheres were treated with trichlorovinylsilane to introduce hydrophobic vinyl groups, followed by self assembly of the polyethylene oxide-polypropylene oxide-polyethylene oxide (PEO-PPO-PEO) triblock surfactant Pluronic F108, or an F108 derivative with nitrilotriacetic acid end groups. Triblock-coated microspheres were gamma-irradiated to covalently stabilize the PPO-surface association. PEO layer stability was evaluated by triblock resistance to elution by SDS, and layer uniformity was evaluated by fibrinogen repulsion. Introduction of nisin to uncoated or triblock-coated microspheres produced a significant positive change in surface charge (zeta potential) as a result of adsorption of the cationic peptide. In sequential adsorption experiments, the introduction of fibrinogen to nisin-loaded triblock layers caused a decrease in zeta potential that was consistent with partial elution of nisin and/or preferential location of fibrinogen at the interface. This change was substantially more pronounced for uncoated than triblock-coated silica, indicating that the PEO layer offers enhanced resistance to nisin elution.
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Affiliation(s)
- Matthew P. Ryder
- School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR 97331
| | - Karl F. Schilke
- School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR 97331
| | - Julie A. Auxier
- School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR 97331
| | - Joseph McGuire
- School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR 97331
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33
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Bayram C, Mizrak AK, Aktürk S, Kurşaklioğlu H, Iyisoy A, Ifran A, Denkbaş EB. In vitro
biocompatibility of plasma-aided surface-modified 316L stainless steel for intracoronary stents. Biomed Mater 2010; 5:055007. [DOI: 10.1088/1748-6041/5/5/055007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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34
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The biocompatibility of self-assembled brush polymers bearing glycine derivatives. Biomaterials 2010; 31:3816-26. [DOI: 10.1016/j.biomaterials.2010.01.130] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2009] [Accepted: 01/20/2010] [Indexed: 11/17/2022]
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35
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Achyuta AKH, Stephens KD, Pryce Lewis HG, Murthy SK. Mitigation of reactive human cell adhesion on poly(dimethylsiloxane) by immobilized trypsin. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:4160-7. [PMID: 20214394 PMCID: PMC2924170 DOI: 10.1021/la903441u] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Occlusion or blockage of silicone shunts utilized in the treatment of hydrocephalus is a major challenge that is currently addressed by multiple shunt replacements. Shunt occlusion is caused by the adhesion and proliferation of reactive cells, such as glial and vascular cells, into the lumen of the catheter and on valve components. This in vitro study describes how the adhesive behavior of four human cell types on poly(dimethylsiloxane) (PDMS) surfaces can be suppressed by functionalization with trypsin, a proteolytic enzyme. The covalently conjugated trypsin retained its proteolytic activity and acted in a dose-dependent manner. Trypsin-modified PDMS surfaces supported significantly lower adhesion of normal human astrocytes, human microglia, human dermal fibroblasts, and human umbilical vein endothelial cells compared to unmodified PDMS surfaces (p < 0.0001). Immunofluorescence imaging of cellular fibronectin and quantitative adsorption experiments with serum components indicated that the PDMS surfaces immobilized with trypsin inhibited surface remodeling by all cell types and resisted protein adsorption. The impact of this work lies in the recognition that the well-known proteolytic characteristics of trypsin can be harnessed by covalent surface immobilization to suppress cell adhesion and protein adsorption.
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Affiliation(s)
- Anil Kumar H. Achyuta
- Department of Chemical Engineering, Northeastern University, 360 Huntington Ave., 342 SN, Boston, Massachusetts 02115, USA
| | - Kyle D. Stephens
- Department of Chemical Engineering, Northeastern University, 360 Huntington Ave., 342 SN, Boston, Massachusetts 02115, USA
| | | | - Shashi K. Murthy
- Department of Chemical Engineering, Northeastern University, 360 Huntington Ave., 342 SN, Boston, Massachusetts 02115, USA
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36
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D'Sa RA, Meenan BJ. Chemical grafting of poly(ethylene glycol) methyl ether methacrylate onto polymer surfaces by atmospheric pressure plasma processing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:1894-1903. [PMID: 19795890 DOI: 10.1021/la902654y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
This article reports the use of atmospheric pressure plasma processing to induce chemical grafting of poly(ethylene glycol) methyl ether methacrylate (PEGMA) onto polystyrene (PS) and poly(methyl methacrylate) (PMMA) surfaces with the aim of attaining an adlayer conformation which is resistant to protein adsorption. The plasma treatment was carried out using a dielectric barrier discharge (DBD) reactor with PEGMA of molecular weights (MW) 1000 and 2000, PEGMA(1000) and PEGMA(2000), being grafted in a two step procedure: (1) reactive groups are generated on the polymer surface followed by (2) radical addition reactions with the PEGMA. The surface chemistry, coherency, and topography of the resulting PEGMA grafted surfaces were characterized by X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS), and atomic force microscopy (AFM), respectively. The most coherently grafted PEGMA layers were observed for the 2000 MW PEGMA macromolecule, DBD processed at an energy dose of 105.0 J/cm(2) as indicated by ToF-SIMS images. The effect of the chemisorbed PEGMA layer on protein adsorption was assessed by evaluating the surface response to bovine serum albumin (BSA) using XPS. BSA was used as a model protein to determine the grafted macromolecular conformation of the PEGMA layer. Whereas the PEGMA(1000) surfaces showed some protein adsorption, the PEGMA(2000) surfaces appeared to absorb no measurable amount of protein, confirming the optimum surface conformation for a nonfouling surface.
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Affiliation(s)
- Raechelle A D'Sa
- Nanotechnology and Integrated Bio-Engineering Centre, University of Ulster, Shore Road, Newtownabbey, BT37 0QB, Northern Ireland
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37
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Glow discharge plasma-induced immobilization of heparin and insulin on polyethylene terephthalate film surfaces enhances anti-thrombogenic properties. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2009. [DOI: 10.1016/j.msec.2008.07.013] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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38
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Okner R, Domb AJ, Mandler D. Electrochemically deposited poly(ethylene glycol)-based sol–gel thin films on stainless steel stents. NEW J CHEM 2009. [DOI: 10.1039/b901864f] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Tai YC, McGuire J, Joshi O, Wang D. Solid Surface Chemical and Physical Effects on the Adsorption of Recombinant Factor VIII. Pharm Dev Technol 2008; 14:126-30. [DOI: 10.1080/10837450802409446] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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40
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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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41
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Tai YC, Joshi P, McGuire J, Neff JA. Nisin adsorption to hydrophobic surfaces coated with the PEO-PPO-PEO triblock surfactant Pluronic F108. J Colloid Interface Sci 2008; 322:112-8. [PMID: 18359037 DOI: 10.1016/j.jcis.2008.02.053] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2007] [Revised: 02/24/2008] [Accepted: 02/26/2008] [Indexed: 10/22/2022]
Abstract
The adsorption and elution of the antimicrobial peptide nisin at hydrophobic, silanized silica surfaces coated with the poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) surfactant Pluronic F108 were measured in situ, with ellipsometry. While such layers are known to inhibit protein adsorption, nisin was observed to adsorb in multilayer quantities, to an extent similar to its adsorption at uncoated, hydrophobic surfaces. The rates of nisin adsorption and elution were generally slower at F108-coated surfaces. And, the sequential adsorption of nisin, including two adsorption-elution cycles at each surface, showed greater differences in adsorption rates between the first and second adsorption cycles, when evaluated at identical mass density, for uncoated relative to F108-coated surfaces. These results indicate that nisin adsorption occurs via "entrapment" within the PEO brush layer at F108-coated surfaces, in this way slowing adsorption and spontaneous elution, and inhibiting post-adsorptive molecular rearrangements by reducing the lateral mobility of nisin. While F108-coated layers rejected adsorption of serum albumin, sequential adsorption experiments carried out with nisin and albumin showed a low level of albumin adsorption when nisin was present at the interface.
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Affiliation(s)
- Yuan-Ching Tai
- Department of Chemical Engineering, Oregon State University, Corvallis, OR 97331, USA
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42
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Rowlands AS, Hudson JE, Cooper-White JJ. From scrawny to brawny: the quest for neomusculogenesis; smart surfaces and scaffolds for muscle tissue engineering. Expert Rev Med Devices 2007; 4:709-28. [PMID: 17850206 DOI: 10.1586/17434440.4.5.709] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The successful generation of functional muscle tissues requires both an in-depth knowledge of muscle tissue physiology and advanced engineering practices. The inherent contractile functionality of muscle is a result of its high-level cellular and matrix organization over a multitude of length scales. While there have been many attempts to produce artificial muscle, a method to fabricate a highly organized construct, comprised of multiple cell types and capable of delivering contractile strengths similar to that of native smooth, skeletal or cardiac muscle has remained elusive. This is largely due to a lack of control over phenotype and spatial organization of cells. This paper covers state-of-the-art approaches to generating both 2D and 3D substrates that provide some form of higher level organization or multiple biochemical, mechanical or electrical cues to cells in order to successfully manipulate their behavior, in a manner that is conducive to the production of contractile muscle tissue. These so-called 'smart surfaces' and 'smart scaffolds' represent vital steps towards surface-engineered substrates for the engineering of muscle tissues, showing confidently that cellular behavior can be effectively and reproducibly manipulated through the design of the physical, chemical and electrical properties of the substrates on which cells are grown. However, many challenges remain to be overcome prior to reaching the ultimate goal of fully functional 3D vascularized engineered muscle.
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Affiliation(s)
- Andrew S Rowlands
- Australian Institute for Bioengineering & Nanotechnology, Tissue Engineering and Microfluidics Laboratory, The University of Queensland, Brisbane, QLD 4072, Australia
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43
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Deglau TE, Johnson JD, Villanueva FS, Wagner WR. Targeting microspheres and cells to polyethylene glycol-modified biological surfaces. J Biomed Mater Res A 2007; 81:578-85. [PMID: 17177289 PMCID: PMC2873022 DOI: 10.1002/jbm.a.31092] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
It has previously been demonstrated that damaged arterial tissue can be acutely modified with protein-reactive polyethylene glycol (PEG) to block undesirable platelet deposition. This concept might be expanded by employing PEG-biotin and its strong interaction with avidin for site-specific targeted delivery. Toward this end, cultured endothelial cells (ECs) were surface modified with PEG-biotin and the available biotin was quantified with flow cytometry. NeutrAvidin-coated microspheres and PEG-biotin modified ECs with NeutrAvidin as a bridging molecule were delivered under arterial shear stress to PEG-biotin modified ECs on a coverslip as well as scrape-damaged bovine carotid arteries. After incubation with a 10 mM solution for 1 min, 8 x 10(7) PEG-biotin molecules/EC were found and persisted for up to 120 h. Perfused microspheres adhered to NHS-PEG-biotin treated bovine carotid arteries with 60 +/- 16 microspheres/mm(2) versus 11 +/- 4 microspheres/mm(2) for control arteries (p < 0.015). Similarly, 22 +/- 5 targeted ECs/mm(2) adhered to NHS-PEG-biotin treated bovine carotid arteries versus 6 +/- 2 ECs/mm(2) for control arteries (p < 0.01). The targeting strategy demonstrated here might ultimately find application for drug delivery, gene therapy, or cell therapy where localization to specific labeled vascular regions is desired following catheter-based or surgical procedures.
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Affiliation(s)
- Timothy E Deglau
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
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44
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Cao L, Chang M, Lee CY, Castner DG, Sukavaneshvar S, Ratner BD, Horbett TA. Plasma-deposited tetraglyme surfaces greatly reduce total blood protein adsorption, contact activation, platelet adhesion, platelet procoagulant activity, and in vitro thrombus deposition. J Biomed Mater Res A 2007; 81:827-37. [PMID: 17236214 DOI: 10.1002/jbm.a.31091] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The ability of tetraethylene glycol dimethyl ether (tetraglyme) plasma deposited coatings exhibiting ultralow fibrinogen adsorption to reduce blood activation was studied with six in vitro methods, namely fibrinogen and von Willebrand's factor adsorption, total protein adsorption, clotting time in recalcified plasma, platelet adhesion and procoagulant activity, and whole blood thrombosis in a disturbed flow catheter model. Surface plasmon resonance results showed that tetraglyme surfaces strongly resisted the adsorption of all proteins from human plasma. The clotting time in the presence of tetraglyme surfaces was lengthened compared with controls, indicating a lower activation of the intrinsic coagulation cascade. Platelet adhesion and thrombin generation by adherent platelets were greatly reduced on tetraglyme-coated materials, compared with uncoated and Biospan-coated glass slides. In the in vitro disturbed blood flow model, tetraglyme plasma coated catheters had 50% less thrombus than did the uncoated catheters. Tetraglyme-coated materials thus had greatly reduced blood interactions as measured with all six methods. The improved blood compatibility of plasma-deposited tetraglyme is thus not only due to their reduced platelet adhesion and activation, but also to a generalized reduction in blood interactions.
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Affiliation(s)
- Lan Cao
- Department of Chemical Engineering, University of Washington, Seattle, Washington 98195, USA
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Tugulu S, Silacci P, Stergiopulos N, Klok HA. RGD—Functionalized polymer brushes as substrates for the integrin specific adhesion of human umbilical vein endothelial cells. Biomaterials 2007; 28:2536-46. [PMID: 17321591 DOI: 10.1016/j.biomaterials.2007.02.006] [Citation(s) in RCA: 199] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2006] [Accepted: 02/05/2007] [Indexed: 12/15/2022]
Abstract
This report demonstrates the feasibility of surface-initiated atom transfer radical polymerization to prepare thin polymer layers ("brushes") that can be functionalized with short peptide ligands and which may be of use as coatings to promote endothelialization of blood-contacting biomaterials. The brushes are composed of poly(2-hydroxyethyl methacrylate) (PHEMA) or poly(poly(ethylene glycol) methacrylate) (PPEGMA), which do not only suppress non-specific adhesion of proteins and cells but also contain hydroxyl groups that can be used to introduce small peptide ligands. A protocol has been developed that allows functionalization of the brushes with RGD containing peptide ligands resulting in surface concentrations ranging from approximately 0.5-12 pmol/cm(2). At peptide surface concentrations >1-5.3 pmol/cm(2), human umbilical vascular endothelial cells (HUVECs) were found to adhere and spread rapidly. A difference in size and morphology of focal adhesions between HUVECs immobilized on PHEMA and PPEGMA brushes was observed. It is proposed that this is due to the increased ethylene glycol spacer length and hydrophilicity of the PPEGMA brushes, which may lead to increased ligand mobility and reduced ligand-integrin affinity. HUVECs immobilized on the polymer brushes were also found to be able to retain homeostasis when exposed to shear stresses that simulated arterial blood flow.
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Affiliation(s)
- Stefano Tugulu
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Institut des Matériaux, Laboratoire des Polymères, Bâtiment MXD, Station 12, CH 1015 Lausanne, Switzerland
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Wang PC, Vilaire G, DeGrado WF, Bennett JS. Interactions of ADP-stimulated human platelets with PEGylated polystyrene substrates prepared by surface amidation. Colloids Surf B Biointerfaces 2007; 58:225-30. [PMID: 17499487 DOI: 10.1016/j.colsurfb.2007.03.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2006] [Revised: 02/05/2007] [Accepted: 03/14/2007] [Indexed: 11/17/2022]
Abstract
A study primarily focused on the interactions between ADP-stimulated human platelets and PEGylated polystyrene substrates is described in this paper. The platelet-surface interactions were investigated using colorimetric acid phosphatase assay. Two types of amine-containing polymeric hydrogel materials based on poly(ethylene glycol) (PEG), H(2)N-PEG-OCH(3) and H(2)N-PEG-NH(2), were used to PEGylate polystyrene surfaces derivatized with maleic anhydride by amidation at alkaline pH. In addition, comparative studies using surfaces non-covalently adsorbed by bovine serum albumin (BSA) or fibrinogen (Fg) were also conducted. The assay results showed that no significant platelet adhesion was observed when PEGylated surfaces or BSA-coated surfaces were exposed to unstimulated gel-filtered platelets (GFP). However, upon ADP-stimulation, platelet adhesion to the surfaces under investigation in this study all increased to varying degrees. Most importantly, the results showed that polystyrene surfaces PEGylated using H(2)N-PEG-NH(2) were most effective in resisting platelet adhesion when assays were performed using ADP-stimulated GFP. By PEGylating the surfaces of polystyrene microtiter wells via the amidation reaction described in this paper, it is demonstrated that (i) higher degree of surface PEGylation is favored at more alkaline pH and (ii) polystyrene substrates capable of more effectively resisting the adhesion of ADP-stimulated GFP can be obtained by the PEGylation reaction carried out at pH 9.1 using H(2)N-PEG-NH(2).
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Affiliation(s)
- Pen-Cheng Wang
- Hematology-Oncology Division, Department of Medicine, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
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Werner C, Maitz MF, Sperling C. Current strategies towards hemocompatible coatings. ACTA ACUST UNITED AC 2007. [DOI: 10.1039/b703416b] [Citation(s) in RCA: 217] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Yamanaka H, Rosenberg G, Weiss WJ, Snyder AJ, Zapanta CM, Siedlecki CA. Short-term in vivo studies of surface thrombosis in a left ventricular assist system. ASAIO J 2006; 52:257-65. [PMID: 16760713 DOI: 10.1097/01.mat.0000219067.19482.1e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Thrombosis continues to be a major adverse and at times fatal event in patients with left ventricular assist systems (LVAS). To assess acute thrombosis in an LVAS, multiscale analysis of surface thrombosis was performed on LVAS blood sacs retrieved after implantation in seven calves for 3 days. Two study groups were evaluated: One group was given heparin and warfarin sodium throughout the study; the second received no postoperative anticoagulation. On explantation, the blood sacs were examined for macroscopic thrombi; microscale thrombosis was assessed with the use of scanning electron microscopy. Macroscopic thrombi about 1 mm in diameter were seen in all sacs from both groups. Although macroscopic thrombi occurred in all sac regions, scanning electron microscopy revealed differences in microscale topography between the port regions and the other sac regions. The primary structure was spherical particles approximately 400 nm in diameter, found to occur at a lower density in the ports. In contrast, the highest densities of proteinaceous rough topography and fibrillar structures consistent with fibrin clot were seen in the port regions. The density distribution of these structures was different in the eight sac regions, and anticoagulation therapy appeared to have no effect on surface thrombosis in these short-term LVAS implants.
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Affiliation(s)
- Hanako Yamanaka
- Department of Bioengineering, The Pennsylvania State University, Hershey, Pennsylvania 17033, USA
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Cao L, Sukavaneshvar S, Ratner BD, Horbett TA. Glow discharge plasma treatment of polyethylene tubing with tetraglyme results in ultralow fibrinogen adsorption and greatly reduced platelet adhesion. J Biomed Mater Res A 2006; 79:788-803. [PMID: 16883583 DOI: 10.1002/jbm.a.30908] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Previous studies from our lab have shown that fibrinogen adsorption (Gamma(Fg)) must be reduced below 10 ng/cm(2) to significantly reduce platelet adhesion, and that radio frequency glow discharge (RFGD) treatment of polymeric films in the presence of tetraethylene glycol dimethyl ether (tetraglyme) can reduce Gamma(Fg) to the desired ultralow value. In this report, the effects of RFGD coatings of tetraglyme on the lumenal surface of PE tubing on Gamma(Fg) and on blood interactions both in vitro and ex vivo are described. Gamma(Fg) on the tetraglyme-coated PE tubing was reduced to the desired ultralow level (<10 ng/cm(2)), and we also observed a significant decrease in adsorption of von Willebrand's factor. In vitro platelet adhesion from washed platelet suspensions, platelet rich plasma, or whole blood to tetraglyme-coated PE tubing was decreased compared to PE, polyurethane, or silicone rubber tubes. In addition, thrombin generation by platelets adherent to tetraglyme-coated PE was also much less than by platelets adherent to PE. When inserted in an ex vivo carotid artery-carotid artery shunt in sheep, the RFGD tetraglyme-coated PE exhibited a very low number of adherent platelets compared to heparin-coated, chromic acid-etched, or plain PE. The RFGD tetraglyme-coated PE tubes exhibited high protein and platelet resistance in vitro, and high platelet resistance ex vivo. The improved hemocompatibility is attributed to the unique chemical structure of RFGD tetraglyme that makes it highly protein resistant.
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Affiliation(s)
- Lan Cao
- Department of Chemical Engineering, University of Washington, Seattle, Washington 98195, USA
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Cho SW, Lim JE, Chu HS, Hyun HJ, Choi CY, Hwang KC, Yoo KJ, Kim DI, Kim BS. Enhancement of in vivo endothelialization of tissue-engineered vascular grafts by granulocyte colony-stimulating factor. J Biomed Mater Res A 2006; 76:252-63. [PMID: 16265638 DOI: 10.1002/jbm.a.30535] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Successful reconstruction of large-diameter blood vessel in humans has been demonstrated using the tissue engineering technique, but improvement in patency of small-diameter bioartificial vascular graft remains a great challenge. This study reports that granulocyte colony-stimulating factor (G-CSF) can enhance in vivo endothelialization of tissue-engineered vascular grafts, which could be used to improve patency of small-diameter vascular graft. Vascular grafts were tissue engineered with decellularized canine abdominal aortas and canine autologous bone marrow-derived cells. Prior to cell seeding onto decellularized graft matrices, bone marrow-derived cells were induced to differentiate into endothelial cells and smooth muscle cells. The cell-seeded vascular grafts were implanted into the abdominal aortas of bone marrow donor dogs. Before and after graft implantation, G-CSF was administered subcutaneously to the dogs (n = 3). The grafts implanted into the dogs not receiving G-CSF were used as controls (n = 3). Eight weeks after implantation, grafts in both groups showed regeneration of vascular tissues including endothelium and smooth muscle. Importantly, endothelium formation was more extensive in the G-CSF-treated grafts than in the control grafts, as assessed with reverse transcription polymerase chain reaction, western blot, and immunohistochemistry. In addition, intimal hyperplasia was significantly reduced in the G-CSF-treated grafts compared to the control grafts. This study suggests that G-CSF administration could be applied to improve patency of small-diameter tissue-engineered vascular grafts.
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Affiliation(s)
- Seung-Woo Cho
- Department of Bioengineering, Hanyang University, Seoul 133-791, Korea
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