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Mochizuki A, Udagawa A, Miwa Y, Oda Y, Yoneyama K, Okuda C. Blood compatibility of poly(propylene glycol diester) and its water structure observed by differential scanning calorimetry and 2H-nuclear magnetic resonance spectroscopy. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2024; 35:1258-1272. [PMID: 38457333 DOI: 10.1080/09205063.2024.2324505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2023] [Accepted: 11/17/2023] [Indexed: 03/10/2024]
Abstract
Recently, we applied solution 2H-nuclear magnetic resonance spectroscopy (2H NMR) to analyze the water (deuterium oxide, D2O) structure in several biopolymers at ambient temperature. We established that polymers with good blood compatibility (i.e. poly(2-methoxyethyl acrylate) (PMEA)) have water observed at high magnetic fields (upfield) compared with bulk water. Polymers containing poly(propylene glycol) (PPG) or poly(propylene oxide) (PPO) exhibit good compatibility; however, the reason for this remains unclear. In addition, reports on the blood compatibility of PPO/PPG are limited. Therefore, PPG diester (PPGest) was prepared as a model polymer, and its blood compatibility and water structure were investigated. PPGest exhibited excellent blood compatibility. The water in PPGest was observed upfield by 2H NMR, and it was defined as non-freezing water via differential scanning calorimetry. Based on these observations, the relationship between the blood compatibility and water structure of PPGest is discussed by comparing with those of PMEA, and the reason for the good performance of PPG/PPO-based polymers is discussed.
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Affiliation(s)
- Akira Mochizuki
- Department of Bio-Medical Engineering, School of Engineering, Tokai University, Isehara, Japan
| | - Ayaka Udagawa
- Department of Bio-Medical Engineering, School of Engineering, Tokai University, Isehara, Japan
| | | | - Yoshiki Oda
- Technology Joint Management Office of Tokai University, Hiratsuka, Japan
| | - Konatsu Yoneyama
- Department of Bio-Medical Engineering, School of Engineering, Tokai University, Isehara, Japan
| | - Chihiro Okuda
- Department of Bio-Medical Engineering, School of Engineering, Tokai University, Isehara, Japan
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2
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Yeh SL, Deval P, Tsai WB. Fabrication of Transparent PEGylated Antifouling Coatings via One-Step Pyrogallol Deposition. Polymers (Basel) 2023; 15:2731. [PMID: 37376377 DOI: 10.3390/polym15122731] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 06/13/2023] [Accepted: 06/16/2023] [Indexed: 06/29/2023] Open
Abstract
Antifouling coatings are critical for many biomedical devices. A simple and universal technique used to anchor antifouling polymers is important in order to expand its applications. In this study, we introduced the pyrogallol (PG)-assisted immobilization of poly(ethylene glycol) (PEG) to deposit a thin antifouling layer on biomaterials. Briefly, biomaterials were soaked in a PG/PEG solution and PEG was immobilized onto the biomaterial surfaces via PG polymerization and deposition. The kinetics of PG/PEG deposition started with the deposition of PG on the substrates, followed by the addition of a PEG-rich adlayer. However, prolonged coating added a top-most PG-rich layer, which deteriorated the antifouling efficacy. By controlling the amounts of PG and PEG and the coating time, the PG/PEG coating was able to reduce more than 99% of the adhesion of L929 cells and the adsorption of fibrinogen. The ultrathin (tens of nanometers) and smooth PG/PEG coating was easily deposited onto a wide variety of biomaterials, and the deposition was robust enough to survive harsh sterilization conditions. Furthermore, the coating was highly transparent and allowed most of the UV and Vis light to pass through. The technique has great potential to be applied to biomedical devices that need a transparent antifouling coating, such as intraocular lenses and biosensors.
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Affiliation(s)
- Shang-Lin Yeh
- Department of Chemical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan
| | - Piyush Deval
- Department of Chemical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan
| | - Wei-Bor Tsai
- Department of Chemical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan
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3
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Struczyńska M, Firkowska-Boden I, Levandovsky N, Henschler R, Kassir N, Jandt KD. How Crystallographic Orientation-Induced Fibrinogen Conformation Affects Platelet Adhesion and Activation on TiO 2. Adv Healthc Mater 2023; 12:e2202508. [PMID: 36691300 DOI: 10.1002/adhm.202202508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 01/18/2023] [Indexed: 01/25/2023]
Abstract
Control of protein adsorption is essential for successful integration of healthcare materials into the body. Human plasma fibrinogen (HPF), especially its conformation is a key upstream regulator for platelet behavior and thus pathological clot formation at the blood-biomaterial interface. A previous study by the authors revealed that the conformation of adsorbed HPF can be controlled by rutile surface crystallographic orientation. Therefore, it is hypothesized that pre-adsorbed HPF on specific rutile orientation can regulate platelets adhesion and activation. Here, it is shown that platelets exposed to the four low index (110), (100), (101), (001) facets of TiO2 (rutile) exhibit surface-specific behavior. Scanning electron microscopy (SEM) observations of platelets morphology and P-selectin expression measurement revealed that on (110) facets, platelets adhesion and activation are suppressed. In contrast, extensive surface coverage by fully activated platelets is observed on (001) facets. Platelets' behavior has been linked to the HPF conformation and thereby availability of platelet-binding sequences. Atomic force microscopy (AFM) imaging supported by immunochemical analysis shows that on (110) facets, HPF is adsorbed in trinodular conformation rendering the γ400-411 platelet-binding sequence inaccessible. This research has potential implications on the bioactivity of different materials crystal facets, reducing the risk of pathological clot formation and thromboembolic complications.
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Affiliation(s)
- Maja Struczyńska
- Chair of Materials Science (CMS), Otto Schott Institute of Materials Research (OSIM), Friedrich Schiller University Jena, Löbdergraben 32, 07743, Jena, Germany
- Jena School for Microbial Communication (JSMC), Neugasse 23, 07743, Jena, Germany
| | - Izabela Firkowska-Boden
- Chair of Materials Science (CMS), Otto Schott Institute of Materials Research (OSIM), Friedrich Schiller University Jena, Löbdergraben 32, 07743, Jena, Germany
| | - Nathan Levandovsky
- Applied Research Institute, University of Illinois Urbana-Champaign, 2100 S Oak St, Champaign, IL, 61820, USA
| | - Reinhard Henschler
- Institute for Transfusion Medicine, University Medical Center, University of Leipzig, Johannisallee 32, 04103, Leipzig, Germany
| | - Nour Kassir
- Institute for Transfusion Medicine, University Medical Center, University of Leipzig, Johannisallee 32, 04103, Leipzig, Germany
| | - Klaus D Jandt
- Chair of Materials Science (CMS), Otto Schott Institute of Materials Research (OSIM), Friedrich Schiller University Jena, Löbdergraben 32, 07743, Jena, Germany
- Jena School for Microbial Communication (JSMC), Neugasse 23, 07743, Jena, Germany
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4
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Yang CC, Lo CT, Luo YL, Venault A, Chang Y. Thermally Stable Bioinert Zwitterionic Sulfobetaine Interfaces Tolerated in the Medical Sterilization Process. ACS Biomater Sci Eng 2021; 7:1031-1045. [PMID: 33591713 DOI: 10.1021/acsbiomaterials.0c01517] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This work introduces a thermally stable zwitterionic structure able to withstand steam sterilization as a general antifouling medical device interface. The sulfobetaine methacrylate (SBMA) monomer and its polymer form are among the most widely used zwitterionic materials. They are easy to synthesize and have good antifouling properties. However, they partially lose their properties after steam sterilization, a common procedure used to sterilize biomedical interfaces. In this study, ultrahigh-performance liquid chromatography/mass spectrometry (UHPLC-MS) was used to analyze and discuss the molecular structure of SBMA before and after a steam sterilization procedure, and a strategy to address the thermal stability issue proposed, using sulfobetaine methacrylamide (SBAA) instead of SBMA. Interestingly, it was found that the chemical structure of SBAA material can withstand the medical sterilization process at 121 °C while maintaining good antifouling properties, tested with proteins (fibrinogen), bacteria (Escherichia coli), and whole blood. On the other hand, SBMA gels failed at maintaining their excellent antifouling properties after sterilization. This study suggests that the SBAA structure can be used to replace SBMA in the bioinert interface of sterilizable medical devices, such as rayon fiber membranes used for disease control.
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Affiliation(s)
- Cheng-Chen Yang
- R&D Center for Membrane Technology, Research Center for Circular Economy, Department of Chemical Engineering, Chung Yuan Christian University, Chungli, Taoyuan 32023, Taiwan
| | - Chen-Tsyr Lo
- R&D Center for Membrane Technology, Research Center for Circular Economy, Department of Chemical Engineering, Chung Yuan Christian University, Chungli, Taoyuan 32023, Taiwan.,Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan
| | - Yi-Ling Luo
- R&D Center for Membrane Technology, Research Center for Circular Economy, Department of Chemical Engineering, Chung Yuan Christian University, Chungli, Taoyuan 32023, Taiwan
| | - Antoine Venault
- R&D Center for Membrane Technology, Research Center for Circular Economy, Department of Chemical Engineering, Chung Yuan Christian University, Chungli, Taoyuan 32023, Taiwan
| | - Yung Chang
- R&D Center for Membrane Technology, Research Center for Circular Economy, Department of Chemical Engineering, Chung Yuan Christian University, Chungli, Taoyuan 32023, Taiwan
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5
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Xu S, Piao J, Lee B, Lim C, Shin S. Platelet thrombus formation by upstream activation and downstream adhesion of platelets in a microfluidic system. Biosens Bioelectron 2020; 165:112395. [DOI: 10.1016/j.bios.2020.112395] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Accepted: 06/14/2020] [Indexed: 01/30/2023]
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6
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Sonoda T, Kobayashi S, Herai K, Tanaka M. Side-Chain Spacing Control of Derivatives of Poly(2-methoxyethyl acrylate): Impact on Hydration States and Antithrombogenicity. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01144] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Toshiki Sonoda
- Department of Applied Molecular Chemistry, Graduate School of Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Shingo Kobayashi
- Institute for Materials Chemistry and Engineering, Kyushu University, CE41 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Keisuke Herai
- Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
| | - Masaru Tanaka
- Institute for Materials Chemistry and Engineering, Kyushu University, CE41 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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7
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Refined fabrication of mechano-stimulating micro-platform for on-chip analyses of complex platelet behavior. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2020.01.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Mzyk A, Imbir G, Trembecka-Wójciga K, Lackner JM, Plutecka H, Jasek-Gajda E, Kawałko J, Major R. Rolling or Two-Stage Aggregation of Platelets on the Surface of Thin Ceramic Coatings under in Vitro Simulated Blood Flow Conditions. ACS Biomater Sci Eng 2020; 6:898-911. [PMID: 33464848 DOI: 10.1021/acsbiomaterials.9b01074] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The process of modern cardiovascular device fabrication should always be associated with an investigation of how surface properties modulate its hemocompatibility through plasma protein adsorption as well as blood morphotic element activation and adhesion. In this work, a package of novel assays was used to correlate the physicochemical properties of thin ceramic coatings with hemocompatibility under dynamic conditions. Different variants of carbon-based films were prepared on polymer substrates using the magnetron sputtering method. The microstructural, mechanical, and surface physicochemical tests were performed to characterize the coatings, followed by investigation of whole human blood quality changes under blood flow conditions using the "Impact R" test, tubes' tester, and radial flow chamber assay. The applied methodology allowed us to determine that aggregate formation on hydrophobic and hydrophilic carbon-based coatings may follow one of the two different mechanisms dependent on the type and conformational changes of adsorbed blood plasma proteins.
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Affiliation(s)
- Aldona Mzyk
- Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Street, 30-059 Krakow, Poland
| | - Gabriela Imbir
- Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Street, 30-059 Krakow, Poland
| | - Klaudia Trembecka-Wójciga
- Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Street, 30-059 Krakow, Poland
| | - Juergen M Lackner
- Joanneum Research Forschungsges, Institute for Surface Technologies and Photonics, Functional Surfaces, 94 Leobner Street, A-8712 Niklasdorf, Austria
| | - Hanna Plutecka
- Department of Medicine, Jagiellonian University Medical College, 8 Skawinska Street, 31-066 Krakow, Poland
| | - Ewa Jasek-Gajda
- Department of Histology, Jagiellonian University Medical College, 7a Kopernika Street, 31-034 Krakow, Poland
| | - Jakub Kawałko
- Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Al. A. Mickiewicza 30, 30-059 Krakow, Poland
| | - Roman Major
- Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Street, 30-059 Krakow, Poland
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9
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10
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Yahata C, Suzuki J, Mochizuki A. Biocompatibility and adhesive strength properties of poly(methyl acrylate-co-acrylic acid) as a function of acrylic acid content. J BIOACT COMPAT POL 2019. [DOI: 10.1177/0883911519877427] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Metals and metal alloys are widely used in medical devices that contact blood and/or tissue, and various coating materials for the metal parts have been proposed to improve surface properties such as biocompatibility. This study aims to understand the performance of new coating materials, copolymers of methyl acrylate and acrylic acid, in terms of their biocompatibility and adhesive strength to a metal surface. Blood compatibility was investigated through platelet and coagulation system responses. Cytocompatibility was studied in three cell-line types (endothelium, smooth muscle, and fibroblasts) in terms of cell viability and morphology; these tests showed that compatibility depended on the cell types and acrylic acid content of the copolymers. Because of their blood compatibility and adhesion strength, the methyl acrylate and acrylic acid copolymers containing 10–24 mol% acrylic acid were found to be excellent candidates as potential coating materials for devices contacting blood.
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Affiliation(s)
- Chie Yahata
- Department of Biomedical Engineering, School of Engineering, Tokai University, Isehara, Japan
| | - Junya Suzuki
- Department of Biomedical Engineering, School of Engineering, Tokai University, Isehara, Japan
| | - Akira Mochizuki
- Department of Biomedical Engineering, School of Engineering, Tokai University, Isehara, Japan
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11
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Gorbet M, Sperling C, Maitz MF, Siedlecki CA, Werner C, Sefton MV. The blood compatibility challenge. Part 3: Material associated activation of blood cascades and cells. Acta Biomater 2019; 94:25-32. [PMID: 31226478 DOI: 10.1016/j.actbio.2019.06.020] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 05/03/2019] [Accepted: 06/13/2019] [Indexed: 01/09/2023]
Abstract
Following protein adsorption/activation which is the first step after the contact of material surfaces and whole blood (part 2), fibrinogen is converted to fibrin and platelets become activated and assembled in the form of a thrombus. This thrombus formation is the key feature that needs to be minimized in the creation of materials with low thrombogenicity. Further aspects of blood compatibility that are important on their own are complement and leukocyte activation which are also important drivers of thrombus formation. Hence this review summarizes the state of knowledge on all of these cascades and cells and their interactions. For each cascade or cell type, the chapter distinguishes statements which are in widespread agreement from statements where there is less of a consensus. STATEMENT OF SIGNIFICANCE: This paper is part 3 of a series of 4 reviews discussing the problem of biomaterial associated thrombogenicity. The objective was to highlight features of broad agreement and provide commentary on those aspects of the problem that were subject to dispute. We hope that future investigators will update these reviews as new scholarship resolves the uncertainties of today.
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Affiliation(s)
- Maud Gorbet
- Department of Systems Design Engineering, University of Waterloo, Waterloo, Ontario, Canada
| | - Claudia Sperling
- Institute Biofunctional Polymer Materials, Max Bergmann Center of Biomaterials, Leibniz-Institut für Polymerforschung Dresden e.V., Dresden, Germany
| | - Manfred F Maitz
- Institute Biofunctional Polymer Materials, Max Bergmann Center of Biomaterials, Leibniz-Institut für Polymerforschung Dresden e.V., Dresden, Germany
| | - Christopher A Siedlecki
- Departments of Surgery and Bioengineering, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States
| | - Carsten Werner
- Institute Biofunctional Polymer Materials, Max Bergmann Center of Biomaterials, Leibniz-Institut für Polymerforschung Dresden e.V., Dresden, Germany
| | - Michael V Sefton
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada.
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12
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Brash JL, Horbett TA, Latour RA, Tengvall P. The blood compatibility challenge. Part 2: Protein adsorption phenomena governing blood reactivity. Acta Biomater 2019; 94:11-24. [PMID: 31226477 PMCID: PMC6642842 DOI: 10.1016/j.actbio.2019.06.022] [Citation(s) in RCA: 112] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Accepted: 06/13/2019] [Indexed: 12/13/2022]
Abstract
The adsorption of proteins is the initiating event in the processes occurring when blood contacts a "foreign" surface in a medical device, leading inevitably to thrombus formation. Knowledge of protein adsorption in this context has accumulated over many years but remains fragmentary and incomplete. Moreover, the significance and relevance of the information for blood compatibility are not entirely agreed upon in the biomaterials research community. In this review, protein adsorption from blood is discussed under the headings "agreed upon" and "not agreed upon or not known" with respect to: protein layer composition, effects on coagulation and complement activation, effects on platelet adhesion and activation, protein conformational change and denaturation, prevention of nonspecific protein adsorption, and controlling/tailoring the protein layer composition. STATEMENT OF SIGNIFICANCE: This paper is part 2 of a series of 4 reviews discussing the problem of biomaterial associated thrombogenicity. The objective was to highlight features of broad agreement and provide commentary on those aspects of the problem that were subject to dispute. We hope that future investigators will update these reviews as new scholarship resolves the uncertainties of today.
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13
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Khalifehzadeh R, Ratner BD. Trifluoromethyl-functionalized poly(lactic acid): a fluoropolyester designed for blood contact applications. Biomater Sci 2019; 7:3764-3778. [DOI: 10.1039/c9bm00353c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Fluorinated polymers are strong candidates for development of new cardiovascular medical devices, due to their lower thrombogenicity as compared to other polymers used for cardiovascular implants.
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Affiliation(s)
| | - Buddy D. Ratner
- Department of Chemical Engineering
- University of Washington
- Seattle
- USA
- Department of Bioengineering
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14
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Sen-Britain S, Hicks WL, Hard R, Gardella JA. Differential orientation and conformation of surface-bound keratinocyte growth factor on (hydroxyethyl)methacrylate, (hydroxyethyl)methacrylate/methyl methacrylate, and (hydroxyethyl)methacrylate/methacrylic acid hydrogel copolymers. Biointerphases 2018; 13:06E406. [PMID: 30360629 PMCID: PMC6905655 DOI: 10.1116/1.5051655] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 09/27/2018] [Accepted: 10/03/2018] [Indexed: 01/12/2023] Open
Abstract
The development of hydrogels for protein delivery requires protein-hydrogel interactions that cause minimal disruption of the protein's biological activity. Biological activity can be influenced by factors such as orientational accessibility for receptor binding and conformational changes, and these factors can be influenced by the hydrogel surface chemistry. (Hydroxyethyl)methacrylate (HEMA) hydrogels are of interest as drug delivery vehicles for keratinocyte growth factor (KGF) which is known to promote re-epithelialization in wound healing. The authors report here the surface characterization of three different HEMA hydrogel copolymers and their effects on the orientation and conformation of surface-bound KGF. In this work, they characterize two copolymers in addition to HEMA alone and report how protein orientation and conformation is affected. The first copolymer incorporates methyl methacrylate (MMA), which is known to promote the adsorption of protein to its surface due to its hydrophobicity. The second copolymer incorporates methacrylic acid (MAA), which is known to promote the diffusion of protein into its surface due to its hydrophilicity. They find that KGF at the surface of the HEMA/MMA copolymer appears to be more orientationally accessible and conformationally active than KGF at the surface of the HEMA/MAA copolymer. They also report that KGF at the surface of the HEMA/MAA copolymer becomes conformationally unfolded, likely due to hydrogen bonding. KGF at the surface of these copolymers can be differentiated by Fourier-transform infrared-attenuated total reflectance spectroscopy and time-of-flight secondary ion mass spectrometry in conjunction with principal component analysis. The differences in KGF orientation and conformation between these copolymers may result in different biological responses in future cell-based experiments.
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Affiliation(s)
- Shohini Sen-Britain
- Department of Chemistry, State University of New York at Buffalo, 475 Natural Sciences Complex, Buffalo, New York 14221
| | - Wesley L Hicks
- Department of Head and Neck/Plastic and Reconstructive Surgery, Roswell Comprehensive Cancer Center, 665 Elm Street, Buffalo, New York 14203
| | - Robert Hard
- Department of Pathological and Anatomical Sciences, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, 955 Main St, Buffalo, New York 14203
| | - Joseph A Gardella
- Department of Chemistry, State University of New York at Buffalo, 475 Natural Sciences Complex, Buffalo, New York 14221
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15
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Surface fluorination of polylactide as a path to improve platelet associated hemocompatibility. Acta Biomater 2018; 78:23-35. [PMID: 30036719 DOI: 10.1016/j.actbio.2018.07.042] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 07/18/2018] [Accepted: 07/19/2018] [Indexed: 12/11/2022]
Abstract
Surface-induced thrombosis is still a significant clinical concern for many types of blood-contacting medical devices. In particular, protein adsorption and platelet adhesion are important events due to their ability to trigger the coagulation cascade and initiate thrombosis. Poly(lactic acid) (PLA) has been the predominant polymer used for making bioresorbable stents. Despite long-term advantages, these stents are associated with higher rates of early thrombosis compared with permanent metallic stents. To address this issue, we modified the surface of PLA with a perfluoro compound facilitated by surface activation using radio frequency (RF) plasma. Fluoropolymers have been extensively used in blood contacting materials, such as blood vessel replacements due to their reduced thrombogenicity and reduced platelet reactivity. The compositions of plasma-treated surfaces were determined by electron spectroscopy for chemical analysis (ESCA). Also, contact angle measurements, cell cytotoxicity and the degradation profile of the treated polymers are presented. Finally, relevant blood compatibility parameters, including plasma protein adsorption, platelet adhesion and morphology, were evaluated. We hypothesized that tight binding of adsorbed albumin by fluoropolymers enhances its potential for blood-contacting applications. STATEMENT OF SIGNIFICANCE Although bioresorbable stents made from poly(lactic acid) (PLA) may have long-term clinical advantages, they have shown higher rates of early thrombosis as compared with permanent metallic stents. To improve the thromboresistance of PLA, we developed a novel method for surface fluorination of this polymer with a perfluoro compound. Fluoropolymers (e.g., expanded polytetrafluoroethylene) have long been used in blood-contacting applications due to their satisfactory clinical performance. This is the first report of PLA surface fluorination which might be applied to the fabrication of a new generation of fluorinated PLA stents with improved platelet interaction, tunable degradability and drug release capabilities. Also, we describe a general strategy for improving the platelet interactions with biomaterials based on albumin retention.
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16
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Horbett TA. Fibrinogen adsorption to biomaterials. J Biomed Mater Res A 2018; 106:2777-2788. [PMID: 29896846 DOI: 10.1002/jbm.a.36460] [Citation(s) in RCA: 100] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 05/16/2018] [Indexed: 01/28/2023]
Abstract
Fibrinogen (Fg) adsorption is an important mechanism underlying cell adhesion to biomaterials and was the major focus of the author's research career. This article summarizes our work on Fg adsorption, with citations of related work as appropriate. The molecular properties of Fg that promote adsorption and cell adhesion will be described. In addition, the adsorption behavior of Fg from buffer, binary solutions with other proteins, and blood plasma will be discussed, including the Vroman effect. Studies of platelet adhesion to surfaces preadsorbed with blood plasmas selectively deficient in Fg, vitronectin (Vn), fibronectin (Fn), or von Willebrand's factor (vWf) will be reviewed. These studies clearly showed a major role for Fg in platelet adhesion under static conditions and both Fg and vWf for adhesion from flowing suspensions, but no significant role for Vn or Fn. However, it was also shown that platelet adhesion was poorly correlated with the total amount of adsorbed Fg, but very well correlated with the binding of antibodies specific to the cell binding domains of Fg. A brief overview of nonfouling surfaces for prevention of Fg adsorption will be given. A more extensive discussion of structural changes in Fg after its adsorption is included, including changes detected with both physicochemical and biological methods. A short discussion of the state of the art of structural determination of adsorbed proteins with computational methods is also given. A final section identifies Fg adsorption as the single most important event determining the biocompatibility of implants in soft tissue and in blood. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 2777-2788, 2018.
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Affiliation(s)
- Thomas A Horbett
- Departments of Bioengineering and Chemical Engineering, University of Washington, Seattle, Washington 98195
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17
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Kinoshita T, Yahata C, Miwa Y, Tsukamoto H, Mochizuki A. Effect of methoxyethyl and methyl ester groups on platelet compatibility of polymers. J BIOACT COMPAT POL 2018. [DOI: 10.1177/0883911518793917] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Poly(2-methoxyethyl acrylate) is known to exhibit good blood compatibility. This study was designed to understand the effect of methoxyethyl ester groups on the platelet compatibility of polymers. Polymers bearing either methoxyethyl ester or methyl ester groups, such as poly(acrylate)s, poly(methacrylate)s, and poly(vinyl benzoate)s, were prepared and a comparative study of the ester groups was performed. Polymers bearing methoxyethyl ester groups and poly(methyl acrylate) exhibited good and approximately equal platelet compatibility, regardless of their chemical structure, as estimated using flow cytometry and scanning electron microscopy. To understand these results, the static properties (namely, surface wettability by contact angle and water structure by differential scanning calorimetry) and a dynamic property (13C-NMR relaxation time of the functional groups) were analyzed. The results showed that platelet compatibility could be interpreted from the water structure and dynamic property.
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Affiliation(s)
- Takuya Kinoshita
- Department of Bio-Medical Engineering, School of Engineering, Tokai University, Isehara, Japan
| | - Chie Yahata
- Department of Bio-Medical Engineering, School of Engineering, Tokai University, Isehara, Japan
| | | | - Hideo Tsukamoto
- Department of Bio-Medical Engineering, School of Engineering, Tokai University, Isehara, Japan
| | - Akira Mochizuki
- Department of Bio-Medical Engineering, School of Engineering, Tokai University, Isehara, Japan
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Yang L, Han L, Liu Q, Xu Y, Jia L. Galloyl groups-regulated fibrinogen conformation: Understanding antiplatelet adhesion on tannic acid coating. Acta Biomater 2017; 64:187-199. [PMID: 28958718 DOI: 10.1016/j.actbio.2017.09.034] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 09/01/2017] [Accepted: 09/25/2017] [Indexed: 12/20/2022]
Abstract
Fibrinogen (Fgn) has been identified as the key protein in the process of biomaterial-induced platelet adhesion. We have recently reported a facile and effective method for constructing platelet-repellent surface using a natural polyphenol component tannic acid (TA). However, the mechanism by which the TA surface repels platelets was not fully understood. To address this issue, we investigated the adsorption of Fgn (amount and conformation) on four TA-functionalized surfaces with different amounts of galloyl groups and the potential for platelet adherence on these surfaces. The experimental results indicated that the four TA-functionalized surfaces adsorbed a similar amount of Fgn, but the conformation and bioactivity of the adsorbed Fgn and the subsequent platelet adherence were quite different among the surfaces. The TA surface with the most galloyl groups induced minimal changes in the conformation of Fgn, a result of the α and γ chains of the adsorbed Fgn being highly inactive on the surface, thus leading to an outstanding antiplatelet adhesion performance. With a decreased amount of galloyl groups, the activity of the α chain in the adsorbed Fgn remained unchanged, but the activity of the γ chain and the extent of platelet adhesion gradually increased. This work provided a new concept for controlling platelet adhesion on solid materials, and we envision that the TA film could have potential applications in the development of new blood-contacting biomaterials in the future. STATEMENT OF SIGNIFICANCE Reducing platelet adhesion on material surfaces is of tremendous scientific interest in the field of blood-contacting biomaterials, but it remains a big challenge due to the highly adhesive nature of the platelets. In this study, we demonstrated for the first time that tannic acid surface with abundant galloyl groups could induce minimal conformational changes of fibrinogen, eventually leading to an outstanding antiplatelet adhesion effect. In addition, the platelet adhesion response could be easily controlled through regulating the amount of galloyl groups on the surface. This work provided a new strategy for controlling platelet adhesion on solid materials, which was totally different from existing methods such as construction of physically patterned surfaces, modification of inert hydrophilic polymers or appending bioactive moieties to target surfaces.
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Davoudi P, Assadpour S, Derakhshan MA, Ai J, Solouk A, Ghanbari H. Biomimetic modification of polyurethane-based nanofibrous vascular grafts: A promising approach towards stable endothelial lining. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 80:213-221. [DOI: 10.1016/j.msec.2017.05.140] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 05/24/2017] [Accepted: 05/28/2017] [Indexed: 12/20/2022]
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Szott LM, Irvin CA, Trollsas M, Hossainy S, Ratner BD. Blood compatibility assessment of polymers used in drug eluting stent coatings. Biointerphases 2016; 11:029806. [PMID: 27083991 PMCID: PMC5014517 DOI: 10.1116/1.4944586] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Revised: 02/29/2016] [Accepted: 03/03/2016] [Indexed: 11/17/2022] Open
Abstract
Differences in thrombosis rates have been observed clinically between different drug eluting stents. Such differences have been attributed to numerous factors, including stent design, injury created by the catheter delivery system, coating application technologies, and the degree of thrombogenicity of the polymer. The relative contributions of these factors are generally unknown. This work focuses on understanding the thrombogenicity of the polymer by examining mechanistic interactions with proteins, human platelets, and human monocytes of a number of polymers used in drug eluting stent coatings, in vitro. The importance for blood interactions of adsorbed albumin and the retention of albumin was suggested by the data. Microscopic imaging and immunostaining enhanced the interpretation of results from the lactate dehydrogenase cell counting assay and provided insight into platelet interactions, total quantification, and morphometry. In particular, highly spread platelets may be surface-passivating, possibly inhibiting ongoing thrombotic events. In many of the assays used here, poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) showed a differentiated protein deposition pattern that may contribute to the explanation of the consistently thromboresistant blood-materials interaction for fluororpolymers cited in literature. These results are supportive of one of several possible factors contributing to the good thromboresistant clinical safety performance of PVDF-HFP coated drug eluting stents.
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Affiliation(s)
- Luisa Mayorga Szott
- Department of Bioengineering, University of Washington, Seattle, Washington 98195
| | - Colleen A Irvin
- Department of Bioengineering, University of Washington, Seattle, Washington 98195
| | - Mikael Trollsas
- Abbott Vascular, Innovation Incubator, Santa Clara, California 95052
| | - Syed Hossainy
- Abbott Vascular, Innovation Incubator, Santa Clara, California 95052
| | - Buddy D Ratner
- Department of Bioengineering, University of Washington, Seattle, Washington 98195 and Department of Chemical Engineering, University of Washington, Seattle, Washington 98195
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21
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Ge A, Seo JH, Qiao L, Yui N, Ye S. Structural Reorganization and Fibrinogen Adsorption Behaviors on the Polyrotaxane Surfaces Investigated by Sum Frequency Generation Spectroscopy. ACS APPLIED MATERIALS & INTERFACES 2015; 7:22709-22718. [PMID: 26393413 DOI: 10.1021/acsami.5b07760] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Polyrotaxanes, such as supramolecular assemblies with methylated α-cyclodextrins (α-CDs) as host molecules noncovalently threaded on the linear polymer backbone, are promising materials for biomedical applications because they allow adsorbed proteins possessing a high surface flexibility as well as control of the cellular morphology and adhesion. To provide a general design principle for biomedical materials, we examined the surface reorganization behaviors and adsorption conformations of fibrinogen on the polyrotaxane surfaces with comparison to several random copolymers by sum frequency generation (SFG) vibrational spectroscopy. We showed that the polyrotaxane (OMe-PRX-PMB) with methylated α-CDs as the host molecule exhibited unique surface structures in an aqueous environment. The hydrophobic interaction between the methoxy groups of the methylated α-CD molecules and methyl groups of the n-butyl methacrylate (BMA) side chains may dominate the surface restructuring behavior of the OMe-PRX-PMB. The orientation analysis revealed that the orientation of the fibrinogen adsorbed on the OMe-PRX-PMB surface is close to a single distribution, which is different from the adsorption behaviors of fibrinogen on other polyrotaxane or random copolymer surfaces.
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Affiliation(s)
- Aimin Ge
- Catalysis Research Center, Hokkaido University , Sapporo 001-0021, Japan
| | - Ji-Hun Seo
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University , Tokyo 101-0062, Japan
| | - Lin Qiao
- Catalysis Research Center, Hokkaido University , Sapporo 001-0021, Japan
| | - Nobuhiko Yui
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University , Tokyo 101-0062, Japan
| | - Shen Ye
- Catalysis Research Center, Hokkaido University , Sapporo 001-0021, Japan
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22
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Fibrinogen adsorption and platelet adhesion to silica surfaces with stochastic nanotopography. Biointerphases 2015; 9:041002. [PMID: 25553877 DOI: 10.1116/1.4900993] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
In this study, the effect of surface nanoscale roughness on fibrinogen adsorption and platelet adhesion was investigated. Nanorough silica surfaces with a low level of surface roughness (10 nm Rrms) were found to support the same level of fibrinogen adsorption as the planar silica surfaces, while nanorough silica surfaces with higher levels of surface roughness (15 nm Rrms) were found to support significantly less fibrinogen adsorption. All surfaces analyzed were found to support the same level of platelet adhesion; however, platelets were rounded in morphology on the nanorough silica surfaces while platelets were spread with a well-developed actin cytoskeleton on the planar silica. Unique quartz crystal microbalance with dissipation monitoring (QCM-D) responses was observed for the interactions between platelets and each of the surfaces. The QCM-D data indicated that platelets were more weakly attached to the nanorough silica surfaces compared with the planar silica. These data support the role of surface nanotopography in directing platelet-surface interactions even when the adsorbed fibrinogen layer is able to support the same level of platelet adhesion.
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Safiullin R, Christenson W, Owaynat H, Yermolenko IS, Kadirov MK, Ros R, Ugarova TP. Fibrinogen matrix deposited on the surface of biomaterials acts as a natural anti-adhesive coating. Biomaterials 2015. [PMID: 26210181 DOI: 10.1016/j.biomaterials.2015.07.007] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Adsorption of fibrinogen on the luminal surface of biomaterials is a critical early event during the interaction of blood with implanted vascular graft prostheses which determines their thrombogenicity. We have recently identified a nanoscale process by which fibrinogen modifies the adhesive properties of various surfaces for platelets and leukocytes. In particular, adsorption of fibrinogen at low density promotes cell adhesion while its adsorption at high density results in the formation of an extensible multilayer matrix, which dramatically reduces cell adhesion. It remains unknown whether deposition of fibrinogen on the surface of vascular graft materials produces this anti-adhesive effect. Using atomic force spectroscopy, single cell force spectroscopy, and standard adhesion assays with platelets and leukocytes, we have characterized the adhesive and physical properties of the contemporary biomaterials, before and after coating with fibrinogen. We found that uncoated PET, PTFE and ePTFE exhibited high adhesion forces developed between the AFM tip or cells and the surfaces. Adsorption of fibrinogen at the increasing concentrations progressively reduced adhesion forces, and at ≥2 μg/ml all surfaces were virtually nonadhesive. Standard adhesion assays performed with platelets and leukocytes confirmed this dependence. These results provide a better understanding of the molecular events underlying thrombogenicity of vascular grafts.
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Affiliation(s)
- Roman Safiullin
- Center for Metabolic and Vascular Biology, School of Life Sciences, Tempe, AZ 85287, United States; Kazan National Research Technological University, Kazan 420088, Russian Federation
| | - Wayne Christenson
- Center for Biological Physics, Tempe, AZ 85287, United States; Department of Physics, Arizona State University, Tempe, AZ 85287, United States
| | - Hadil Owaynat
- Center for Metabolic and Vascular Biology, School of Life Sciences, Tempe, AZ 85287, United States
| | - Ivan S Yermolenko
- Center for Metabolic and Vascular Biology, School of Life Sciences, Tempe, AZ 85287, United States
| | - Marsil K Kadirov
- Kazan National Research Technological University, Kazan 420088, Russian Federation; Arbuzov Institute of Organic and Physical Chemistry, Kazan 420088, Russian Federation
| | - Robert Ros
- Center for Biological Physics, Tempe, AZ 85287, United States; Department of Physics, Arizona State University, Tempe, AZ 85287, United States
| | - Tatiana P Ugarova
- Center for Metabolic and Vascular Biology, School of Life Sciences, Tempe, AZ 85287, United States.
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24
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Ye SH, Hong Y, Sakaguchi H, Shankarraman V, Luketich SK, D'Amore A, Wagner WR. Nonthrombogenic, biodegradable elastomeric polyurethanes with variable sulfobetaine content. ACS APPLIED MATERIALS & INTERFACES 2014; 6:22796-806. [PMID: 25415875 DOI: 10.1021/am506998s] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
For applications where degradable polymers are likely to have extended blood contact, it is often important for these materials to exhibit high levels of thromboresistance. This can be achieved with surface modification approaches, but such modifications may be transient with degradation. Alternatively, polymer design can be altered such that the bulk polymer is thromboresistant and this is maintained with degradation. Toward this end a series of biodegradable, elastic polyurethanes (PESBUUs) containing different zwitterionic sulfobetaine (SB) content were synthesized from a polycaprolactone-diol (PCL-diol):SB-diol mixture (100:0, 75:25, 50:50, 25:75 and 0:100) reacted with diisocyanatobutane and chain extended with putrescine. The chemical structure, tensile mechanical properties, thermal properties, hydrophilicity, biodegradability, fibrinogen adsorption and thrombogenicity of the resulting polymers was characterized. With increased SB content some weakening in tensile properties occurred in wet conditions and enzymatic degradation also decreased. However, at higher zwitterionic molar ratios (50% and 75%) wet tensile strength exceeded 15 MPa and breaking strain was >500%. Markedly reduced thrombotic deposition was observed both before and after substantial degradation for both of these PESBUUs and they could be processed by electrospinning into a vascular conduit format with appropriate compliance properties. The mechanical and degradation properties as well as the acute in vitro thrombogenicity assessment suggest that these tunable polyurethanes could provide options appropriate for use in blood contacting applications where a degradable, elastomeric component with enduring thromboresistance is desired.
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Affiliation(s)
- Sang-Ho Ye
- McGowan Institute for Regenerative Medicine, ‡Department of Surgery, ||Department of Bioengineering, and ▽Department of Chemical Engineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15219, United States
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25
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Liu X, Yuan L, Li D, Tang Z, Wang Y, Chen G, Chen H, Brash JL. Blood compatible materials: state of the art. J Mater Chem B 2014; 2:5718-5738. [PMID: 32262016 DOI: 10.1039/c4tb00881b] [Citation(s) in RCA: 189] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Devices that function in contact with blood are ubiquitous in clinical medicine and biotechnology. These devices include vascular grafts, coronary stents, heart valves, catheters, hemodialysers, heart-lung bypass systems and many others. Blood contact generally leads to thrombosis (among other adverse outcomes), and no material has yet been developed which remains thrombus-free indefinitely and in all situations: extracorporeally, in the venous circulation and in the arterial circulation. In this article knowledge on blood-material interactions and "thromboresistant" materials is reviewed. Current approaches to the development of thromboresistant materials are discussed including surface passivation; incorporation and/or release of anticoagulants, antiplatelet agents and thrombolytic agents; and mimicry of the vascular endothelium.
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Affiliation(s)
- Xiaoli Liu
- The Key Lab of Health Chemistry and Molecular Diagnosis of Suzhou, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China.
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26
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Wei Q, Becherer T, Angioletti-Uberti S, Dzubiella J, Wischke C, Neffe AT, Lendlein A, Ballauff M, Haag R. Protein Interactions with Polymer Coatings and Biomaterials. Angew Chem Int Ed Engl 2014; 53:8004-31. [DOI: 10.1002/anie.201400546] [Citation(s) in RCA: 524] [Impact Index Per Article: 52.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Indexed: 01/07/2023]
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27
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Wei Q, Becherer T, Angioletti-Uberti S, Dzubiella J, Wischke C, Neffe AT, Lendlein A, Ballauff M, Haag R. Wechselwirkungen von Proteinen mit Polymerbeschichtungen und Biomaterialien. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400546] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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28
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Jamiolkowski MA, Woolley JR, Kameneva MV, Antaki JF, Wagner WR. Real time visualization and characterization of platelet deposition under flow onto clinically relevant opaque surfaces. J Biomed Mater Res A 2014; 103:1303-11. [PMID: 24753320 DOI: 10.1002/jbm.a.35202] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Revised: 03/31/2014] [Accepted: 04/18/2014] [Indexed: 11/07/2022]
Abstract
Although the thrombogenic nature of the surfaces of cardiovascular devices is an important aspect of blood biocompatibility, few studies have examined platelet deposition onto opaque materials used for these devices in real time. This is particularly true for the metallic surfaces used in current ventricular assist devices (VADs). Using hemoglobin depleted red blood cells (RBC ghosts) and long working distance optics to visualize platelet deposition, we sought to perform such an evaluation. Fluorescently labeled platelets mixed with human RBC ghosts were perfused across six opaque materials (a titanium alloy (Ti6Al4V), silicon carbide (SiC), alumina (Al2O3, 2-methacryloyloxyethyl phosphorylcholine polymer coated Ti6Al4V (MPC-Ti6Al4V), yttria partially stabilized zirconia (YZTP), and zirconia toughened alumina (ZTA)) for 5 min at wall shear rates of 400 and 1000 s(-1). Ti6Al4V had significantly increased platelet deposition relative to MPC-Ti6Al4V, Al2 O3 , YZTP, and ZTA at both wall shear rates (p < 0.01). For all test surfaces, increasing the wall shear rate produced a trend of decreased platelet adhesion. The described system can be a utilized as a tool for comparative analysis of candidate blood-contacting materials with acute blood contact.
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Affiliation(s)
- Megan A Jamiolkowski
- McGowan Institute for Regenerative Medicine, Pittsburgh, Pennsylvania; Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania
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29
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Ji Q, Zhang S, Zhang J, Wang Z, Wang J, Cui Y, Pang L, Wang S, Kong D, Zhao Q. Dual Functionalization of Poly(ε-caprolactone) Film Surface through Supramolecular Assembly with the Aim of Promoting In Situ Endothelial Progenitor Cell Attachment on Vascular Grafts. Biomacromolecules 2013; 14:4099-107. [DOI: 10.1021/bm401239a] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Qing Ji
- State
Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive
Materials (Ministry of Education), College of Life Sciences, Nankai University, Tianjin 300071, People’s Republic of China
| | - Suai Zhang
- Tianjin
Key Laboratory of Biomaterial Research, Institute of Biomedical Engineering, Chinese Academy of Medical Science, Tianjin 300192, People’s Republic of China
| | - Jimin Zhang
- Tianjin
Key Laboratory of Biomaterial Research, Institute of Biomedical Engineering, Chinese Academy of Medical Science, Tianjin 300192, People’s Republic of China
| | - Zhihong Wang
- State
Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive
Materials (Ministry of Education), College of Life Sciences, Nankai University, Tianjin 300071, People’s Republic of China
| | - Jianing Wang
- State
Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive
Materials (Ministry of Education), College of Life Sciences, Nankai University, Tianjin 300071, People’s Republic of China
| | - Yun Cui
- State
Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive
Materials (Ministry of Education), College of Life Sciences, Nankai University, Tianjin 300071, People’s Republic of China
| | - Liyun Pang
- Tianjin
Key Laboratory of Biomaterial Research, Institute of Biomedical Engineering, Chinese Academy of Medical Science, Tianjin 300192, People’s Republic of China
| | - Shufang Wang
- State
Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive
Materials (Ministry of Education), College of Life Sciences, Nankai University, Tianjin 300071, People’s Republic of China
| | - Deling Kong
- State
Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive
Materials (Ministry of Education), College of Life Sciences, Nankai University, Tianjin 300071, People’s Republic of China
- Tianjin
Key Laboratory of Biomaterial Research, Institute of Biomedical Engineering, Chinese Academy of Medical Science, Tianjin 300192, People’s Republic of China
| | - Qiang Zhao
- State
Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive
Materials (Ministry of Education), College of Life Sciences, Nankai University, Tianjin 300071, People’s Republic of China
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30
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Srokowski EM, Woodhouse KA. Evaluation of the bulk platelet response and fibrinogen interaction to elastin-like polypeptide coatings. J Biomed Mater Res A 2013; 102:540-51. [DOI: 10.1002/jbm.a.34699] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Revised: 02/18/2013] [Accepted: 02/21/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Elizabeth M. Srokowski
- Department of Chemical Engineering and Applied Chemistry; University of Toronto; Ontario Canada
- Institute of Biomaterials and Biomedical Engineering; University of Toronto; Ontario Canada
| | - Kimberly A. Woodhouse
- Department of Chemical Engineering and Applied Chemistry; University of Toronto; Ontario Canada
- Institute of Biomaterials and Biomedical Engineering; University of Toronto; Ontario Canada
- Department of Chemical Engineering; Queen's University; Ontario Canada
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31
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Responses of platelets and endothelial cells to heparin/fibronectin complex on titanium: In situ investigation by quartz crystal microbalance with dissipation and immunochemistry. J Biosci Bioeng 2013; 116:235-45. [DOI: 10.1016/j.jbiosc.2013.02.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Revised: 02/06/2013] [Accepted: 02/18/2013] [Indexed: 01/17/2023]
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33
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34
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Lange M, Braune S, Luetzow K, Richau K, Scharnagl N, Weinhart M, Neffe AT, Jung F, Haag R, Lendlein A. Surface Functionalization of Poly(ether imide) Membranes with Linear, Methylated Oligoglycerols for Reducing Thrombogenicity. Macromol Rapid Commun 2012; 33:1487-92. [DOI: 10.1002/marc.201200426] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Indexed: 11/11/2022]
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35
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Tsai WB, Shi Q, Grunkemeier JM, McFarland C, Horbett TA. Platelet adhesion to radiofrequency glow-discharge-deposited fluorocarbon polymers preadsorbed with selectively depleted plasmas show the primary role of fibrinogen. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 15:817-40. [PMID: 15318794 DOI: 10.1163/1568562041271093] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Fluorocarbon radio-frequency glow-discharge (RFGD) treatment has previously been shown to cause decreased platelet adhesion despite the presence of adsorbed fibrinogen on the surfaces. In this study platelet adhesion to fluorocarbon RFGD-treated surfaces preadsorbed with human plasma was further examined. A series of plasma deposited fluorocarbon thin films were made by varying the C3F6/CH4 ratio in the monomer feed. The surfaces were preadsorbed with plasma, serum, or plasma selectively depleted of fibronectin, vitronectin, or Von Willebrand factor, and platelet adhesion was measured. We also measured fibrinogen adsorption to the surfaces from plasma, monoclonal antibody binding to adsorbed fibrinogen and SDS elutability of the adsorbed fibrinogen. The antibodies used bind to the three putative platelet binding sites on fibrinogen, namely, M1 antibody binds to the dodecapeptide at the C-terminus of the gamma chain, gamma (402-411), R1 antibody binds to a sequence in the Aalpha chain (87-100) which includes RGDF at Aalpha (95-98) and R2 antibody binds a sequence in the Aalpha chain (566-580) which includes RGDS at Aalpha (572-575). Fibrinogen was found to play a decisive role in mediating platelet adhesion to the fluorocarbon surfaces contacting plasma. Few platelets adhered to the fluorocarbon surfaces preadsorbed with serum, while preadsorption with plasma selectively-depleted of either fibronectin, vitronectin, or von Willebrand factor did not decrease platelet adhesion significantly. Replenishment of exogenous fibrinogen to serum restored platelet adhesion, while replenishment of the other proteins had no effect. Platelet adhesion to the fluorocarbon surfaces was lower than to PET or the methane glow-discharge-treated PET. However, there was no apparent correlation between platelet adhesion and the amount of fibrinogen adsorption or monoclonal antibody binding to surface-bound fibrinogen.
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Affiliation(s)
- W B Tsai
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
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36
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Kuo WH, Wang MJ, Chang CW, Wei TC, Lai JY, Tsai WB, Lee C. Improvement of hemocompatibility on materials by photoimmobilization of poly(ethylene glycol). ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm15435h] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Kuo WH, Wang MJ, Chien HW, Wei TC, Lee C, Tsai WB. Surface Modification with Poly(sulfobetaine methacrylate-co-acrylic acid) To Reduce Fibrinogen Adsorption, Platelet Adhesion, and Plasma Coagulation. Biomacromolecules 2011; 12:4348-56. [DOI: 10.1021/bm2013185] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Wei-Hsuan Kuo
- Department of Chemical Engineering, National Taiwan University of Science and Technology, 43, Keelung Rd.,
Sec. 4, Taipei 106, Taiwan
| | - Meng-Jiy Wang
- Department of Chemical Engineering, National Taiwan University of Science and Technology, 43, Keelung Rd.,
Sec. 4, Taipei 106, Taiwan
| | - Hsiu-Wen Chien
- Department of Chemical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 106,
Taiwan
| | - Ta-Chin Wei
- Department of Chemical
Engineering, Chung Yuan Christian University, 200, Chung Pei Rd., Chung Li 320, Taiwan
| | - Chiapyng Lee
- Department of Chemical Engineering, National Taiwan University of Science and Technology, 43, Keelung Rd.,
Sec. 4, Taipei 106, Taiwan
| | - Wei-Bor Tsai
- Department of Chemical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 106,
Taiwan
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38
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Szott LM, Horbett TA. Protein interactions with surfaces: cellular responses, complement activation, and newer methods. Curr Opin Chem Biol 2011; 15:677-82. [DOI: 10.1016/j.cbpa.2011.04.021] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2011] [Accepted: 04/07/2011] [Indexed: 10/18/2022]
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39
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Martins MCL, Ochoa-Mendes V, Ferreira G, Barbosa JN, Curtin SA, Ratner BD, Barbosa MA. Interactions of leukocytes and platelets with poly(lysine/leucine) immobilized on tetraethylene glycol-terminated self-assembled monolayers. Acta Biomater 2011; 7:1949-55. [PMID: 21237292 DOI: 10.1016/j.actbio.2011.01.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2010] [Revised: 12/14/2010] [Accepted: 01/11/2011] [Indexed: 11/28/2022]
Abstract
Surfaces that bind heparin are important for biomaterials for blood deheparinization. In our recent work it was demonstrated that a polypeptide composed of L-lysine and L-leucine (pKL), after immobilization onto tetra(ethylene glycol) terminated self-assembled monolayers (EG4-SAMs), can bind heparin from blood plasma in a selective, concentration-dependent way. During this work the effect of this peptide on platelet adhesion and activation and leukocyte adhesion was studied. The surface charge of these nanostructured surfaces was evaluated in order to correlate the effect of positively charged amine groups and hydrophobic methyl groups on the behavior of platelets and leukocyte adhesion. The results demonstrated that the presence of pKL decreased leukocyte adhesion to EG4-SAMs at all concentrations used. This effect is even more pronounced when surfaces were pre-immersed in heparinized plasma. In contrast, there is an increase in platelet adhesion and activation with increased percentage immobilized pKL. This effect is enhanced when surfaces were pre-immersed in heparinized plasma. However, adsorbed pKL in very low amounts does not induce platelet adhesion and activation compared with EG4, even when pre-immersed in plasma. Since only low pKL amounts are necessary to induce heparin selectivity, these results are promising for the development of heparin-binding biomaterials for blood deheparinization.
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Affiliation(s)
- M Cristina L Martins
- Instituto de Engenharia Biomédica, Divisão de Biomateriais, Universidade do Porto, Rua do Campo Alegre, Portugal.
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Li G, Yang P, Liao Y, Huang N. Tailoring of the Titanium Surface by Immobilization of Heparin/Fibronectin Complexes for Improving Blood Compatibility and Endothelialization: An in Vitro Study. Biomacromolecules 2011; 12:1155-68. [DOI: 10.1021/bm101468v] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Guicai Li
- Institute of Biomaterials and Surface Engineering, Key Laboratory for Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, P.R. China
| | - Ping Yang
- Institute of Biomaterials and Surface Engineering, Key Laboratory for Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, P.R. China
| | - Yuzhen Liao
- Institute of Biomaterials and Surface Engineering, Key Laboratory for Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, P.R. China
| | - Nan Huang
- Institute of Biomaterials and Surface Engineering, Key Laboratory for Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, P.R. China
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Sankaranarayanan K, Dhathathreyan A, Miller R. Assembling Fibrinogen at Air/Water and Solid/Liquid Interfaces Using Langmuir and Langmuir−Blodgett Films. J Phys Chem B 2010; 114:8067-75. [DOI: 10.1021/jp100896b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
| | | | - Reinhard Miller
- Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Am Mühlenberg 1, 14424 Potsdam, FRG
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Xu LC, Runt J, Siedlecki CA. Dynamics of hydrated polyurethane biomaterials: Surface microphase restructuring, protein activity and platelet adhesion. Acta Biomater 2010; 6:1938-47. [PMID: 19948255 DOI: 10.1016/j.actbio.2009.11.031] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2009] [Revised: 10/19/2009] [Accepted: 11/23/2009] [Indexed: 11/26/2022]
Abstract
Microphase separation is a central feature of segmented polyurethane biomaterials and contributes to the biological response to these materials. In this study we utilized atomic force microscopy (AFM) to study the dynamic restructuring of three polyurethanes having soft segment chemistries of interest in biomedical applications. For each of the materials we followed the changes in near surface mechanical properties during hydration, as well as fibrinogen activity and platelet adhesion on these surfaces. Both AFM phase imaging and force mode analysis demonstrated that these polyurethane biomaterials underwent reorientation and rearrangement resulting in a net enrichment of hard domains at the surface. Fibrinogen activity and platelet adhesion on the polyurethane surfaces were found to decrease with increasing hydration time. The findings suggest that water-induced enrichment of hydrophilic hard domains at the surface changes the local surface physical and chemical properties in a way that influences the conformation of fibrinogen, changing the availability of the platelet-binding sites in the protein. This work demonstrates that the hydrated polyurethane biomaterial interface is a complex and dynamic environment where the surface chemistry is changing, altering the activity of fibrinogen and affecting blood platelet adhesion.
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Chien HW, Wu SP, Kuo WH, Wang MJ, Lee C, Lai JY, Tsai WB. Modulation of hemocompatibility of polysulfone by polyelectrolyte multilayer films. Colloids Surf B Biointerfaces 2010; 77:270-8. [DOI: 10.1016/j.colsurfb.2010.02.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2009] [Revised: 01/30/2010] [Accepted: 02/03/2010] [Indexed: 11/17/2022]
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Sivaraman B, Latour RA. The adherence of platelets to adsorbed albumin by receptor-mediated recognition of binding sites exposed by adsorption-induced unfolding. Biomaterials 2009; 31:1036-44. [PMID: 19864017 DOI: 10.1016/j.biomaterials.2009.10.017] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2009] [Accepted: 10/08/2009] [Indexed: 11/27/2022]
Abstract
Although albumin (Alb) is the most abundant plasma protein, it is considered to be non-adhesive to platelets, as it lacks any known amino acid sequences for binding platelet receptors. Recent studies have suggested that platelets adhere to adsorbed Alb by mechanisms linked to its conformational state. To definitively address this issue we used circular dichroism (CD) spectropolarimetry to characterize the conformation of Alb adsorbed on a broad range of surface chemistries from a wide range of Alb solution concentrations, with platelet adhesion examined using a lactate dehydrogenase (LDH) assay and scanning electron microscopy (SEM). Our results prove that platelets bind to adsorbed Alb through receptor-mediated processes, with binding sites in Alb exposed and/or formed by adsorption-induced protein unfolding. Most importantly, beyond a critical degree of unfolding, the platelet adhesion levels correlated strongly with the adsorption-induced unfolding in Alb. The blockage of Arg-Gly-Asp (RGD) specific platelet receptors using an Arg-Gly-Asp-Ser (RGDS) peptide led to significant inhibition of platelet adhesion to adsorbed Alb, with the extent of inhibition and morphology of adherent platelets being similar for both Alb and Fg. Chemical neutralization of arginine (Arg) residues in the adsorbed Alb layer inhibited platelet-Alb interactions significantly, indicating that Arg residues play a prominent role in mediating platelet adhesion to Alb. These results provide deeper insight into the molecular mechanisms that mediate the interactions of platelets with adsorbed proteins, and how to control these interactions to improve the blood compatibility of biomaterials for cardiovascular applications.
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Affiliation(s)
- Balakrishnan Sivaraman
- Department of Bioengineering, 501 Rhodes Engineering Center, Clemson University, Clemson, SC 29634, USA
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Smith JR, Cicerone MT, Meuse CW. Measuring hydrogen-deuterium exchange in protein monolayers. SURF INTERFACE ANAL 2009. [DOI: 10.1002/sia.3108] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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46
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Zhang M, Horbett TA. Tetraglyme coatings reduce fibrinogen and von Willebrand factor adsorption and platelet adhesion under both static and flow conditions. J Biomed Mater Res A 2009; 89:791-803. [PMID: 18496865 DOI: 10.1002/jbm.a.32085] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Previous studies have showed that radio-frequency plasma deposited tetraglyme coatings greatly reduced fibrinogen adsorption (Gamma(Fg)) from highly diluted plasmas (0.1 and 1%) and subsequent platelet adhesion under static conditions. In this study, the protein resistant properties of tetraglyme were re-examined with high-concentration plasma, and subsequent platelet adhesion was measured under both static and flow conditions. The resistance of tetraglyme to vWf adsorption (Gamma(vWf)) and the role of vWf in platelet adhesion under flow were also investigated. Gamma(Fg) and Gamma(vWf) were measured with (125)I radiolabeled proteins. Flow studies were done at shear rates of 50 or 500 s(-1) by passing a platelet/red cell suspension through a GlycoTech flow chamber. When adsorbed from a series of increasing plasma concentrations, the adsorption of both proteins to tetraglyme increased steadily, and did not show a peak at intermediate dilutions, i.e., there was no Vroman effect. When plasma concentration was less than 10%, the tetraglyme surface was highly nonfouling, exhibiting ultralow Gamma(Fg) (less than 5 ng/cm(2)) and extremely low platelet adhesion under both static and flow conditions. However, when the adsorption was done from 100% plasma, Gamma(Fg) was much higher ( approximately 85 ng/cm(2)), indicating that tetraglyme surface may not be sufficiently protein-resistant in the physiological environment. To correlate platelet adhesion under flow with Gamma(Fg) and Gamma(vWf), a series of tetraglyme surfaces varying in ether content and protein adsorption was created by varying deposition power. On these surfaces, platelet adhesion at low shear rate depended only on the amount of Gamma(Fg), but under high shear, both Gamma(Fg) and Gamma(vWf) affected platelet adhesion. In particular, it was found that Gamma(vWf) must be reduced to less than 0.4 ng/cm(2) to achieve ultra low platelet adhesion under high shear.
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Affiliation(s)
- Min Zhang
- Department of Bioengineering, University of Washington, Seattle, 98195, USA
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Agnihotri A, Soman P, Siedlecki CA. AFM measurements of interactions between the platelet integrin receptor GPIIbIIIa and fibrinogen. Colloids Surf B Biointerfaces 2009; 71:138-47. [DOI: 10.1016/j.colsurfb.2009.01.019] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2008] [Revised: 01/24/2009] [Accepted: 01/25/2009] [Indexed: 11/16/2022]
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Smith JR, Cicerone MT, Meuse CW. Tertiary structure changes in albumin upon surface adsorption observed via fourier transform infrared spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:4571-4578. [PMID: 19366224 DOI: 10.1021/la802955w] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A nondestructive Fourier transform infrared (FTIR) spectroscopy assay, amenable to exploring a wide range of proteins and polymers, is used to measure changes in the tertiary structure of bovine serum albumin (BSA) adsorbed to three surfaces: gold, polystyrene (PS), and poly(D,L-lactic acid) (PDLLA). Tertiary structural analysis is important because typical secondary structural analysis (FTIR and CD) is not always sensitive enough to distinguish between the sometimes subtle protein structural changes caused by adsorption. The polymers are spin-coated onto a gold surface, exposed to protein, and then immersed in a deuterated buffer solution to probe the protein's tertiary structure before the sample is removed from its aqueous environment. Infrared band intensities, related to the exchange of amide hydrogen for deuterium (HDX), as a function of the immersion time in deuterated buffer, are used to determine the extent of amide solvent exposure. Analysis of the results in terms of a single exponential decay shows that enough amides undergo a measurable amount of exchange in 60 min to quantify relative changes in BSA solvent exposure on different surfaces. In addition, substantial fractions undergo HDX at a rate too fast or too slow to be followed with our experimental protocol. The proportions of these quickly and slowly exchanging amide groups also provide information about relative changes in the BSA structure on different surfaces. Adsorption was found to increase the extent of HDX over that observed for BSA in solution, consistent with surface-induced unfolding and a loss of tertiary structure. Changes in HDX were found to be more sensitive to which surface was absorbing the protein than the typical FTIR secondary structural analysis obtained from fitting the amide I band. HDX was greatest for BSA adsorbed to the surface of PDLLA and least in the case of BSA adsorbed to gold, which indicates the greatest and least degree of unfolding, respectively.
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Affiliation(s)
- Jack R Smith
- Polymers Division, Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8543, USA
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Gristina R, D'Aloia E, Senesi GS, Milella A, Nardulli M, Sardella E, Favia P, d'Agostino R. Increasing cell adhesion on plasma deposited fluorocarbon coatings by changing the surface topography. J Biomed Mater Res B Appl Biomater 2009; 88:139-49. [DOI: 10.1002/jbm.b.31160] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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50
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Zhang Z, Zhang M, Chen S, Horbett TA, Ratner BD, Jiang S. Blood compatibility of surfaces with superlow protein adsorption. Biomaterials 2008; 29:4285-91. [DOI: 10.1016/j.biomaterials.2008.07.039] [Citation(s) in RCA: 393] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2008] [Accepted: 07/28/2008] [Indexed: 11/16/2022]
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