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Montaño-Machado V, Chevallier P, Mantovani D, Pauthe E. On the potential for fibronectin/phosphorylcholine coatings on PTFE substrates to jointly modulate endothelial cell adhesion and hemocompatibility properties. BIOMATTER 2015; 5:e979679. [PMID: 25785369 PMCID: PMC4581125 DOI: 10.4161/21592535.2014.979679] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The use of biomolecules as coatings on biomaterials is recognized to constitute a promising approach to modulate the biological response of the host. In this work, we propose a coating composed by 2 biomolecules susceptible to provide complementary properties for cardiovascular applications: fibronectin (FN) to enhance endothelialization, and phosphorylcholine (PRC) for its non thrombogenic properties. Polytetrafluoroethylene (PTFE) was selected as model substrate mainly because it is largely used in cardiovascular applications. Two approaches were investigated: 1) a sequential adsorption of the 2 biomolecules and 2) an adsorption of the protein followed by the grafting of phosphorylcholine via chemical activation. All coatings were characterized by immunofluorescence staining, X-Ray Photoelectron Spectroscopy and Scanning Electron Microscopy analyses. Assays with endothelial cells showed improvement on cell adhesion, spreading and metabolic activity on FN-PRC coatings compared with the uncoated PTFE. Platelets adhesion and activation were both reduced on the coated surfaces when compared with uncoated PTFE. Moreover, clotting time tests exhibited better hemocompatibility properties of the surfaces after a sequential adsorption of FN and PRC. In conclusion, FN-PRC coating improves cell adhesion and non-thrombogenic properties, thus revealing a certain potential for the development of this combined deposition strategy in cardiovascular applications.
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Affiliation(s)
- Vanessa Montaño-Machado
- a Laboratory for Biomaterials & Bioengineering (CRC-I); Department of Min-Met-Materials Engineering & CHU de Quebec Research Center; Laval University ; Quebec City , Canada
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Son S, Kim G, Singha K, Park S, Ree M, Kim WJ. Artificial cell membrane-mimicking nanostructure facilitates efficient gene delivery through fusogenic interaction with the plasma membrane of living cells. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2011; 7:2991-2997. [PMID: 21901821 DOI: 10.1002/smll.201100232] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Revised: 05/18/2011] [Indexed: 05/31/2023]
Affiliation(s)
- Sejin Son
- Department of Chemistry, BK School of Molecular Science, Polymer Research Institute, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Pohang 790-784, South Korea
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Ishihara K, Takai M. Bioinspired interface for nanobiodevices based on phospholipid polymer chemistry. J R Soc Interface 2009; 6 Suppl 3:S279-91. [PMID: 19324688 PMCID: PMC2690090 DOI: 10.1098/rsif.2008.0335] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
This review paper describes novel biointerfaces for nanobiodevices. Biocompatible and non-biofouling surfaces are designed largely based on cell membrane structure, and the preparation and functioning of the bioinspired interface are evaluated and compared between living and artificial systems. A molecular assembly of polymers with a phospholipid polar group has been developed as the platform of the interface. At the surface, protein adsorption is effectively reduced and the subsequent bioreactions are suppressed. Through this platform, biomolecules with a high affinity to the specific molecules are introduced under mild conditions. The activity of the biomolecules is retained even after immobilization. This bioinspired interface is adapted to construct bionanodevices, that is, microfluidic chips and nanoparticles for capturing target molecules and cells. The interface functions well and has a very high efficiency for biorecognition. This bioinspired interface is a promising universal platform that integrates various fields of science and has useful applications.
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Affiliation(s)
- Kazuhiko Ishihara
- Department of Materials Engineering, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
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4
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Kristensen EME, Nederberg F, Rensmo H, Bowden T, Hilborn J, Siegbahn H. Photoelectron spectroscopy studies of the functionalization of a silicon surface with a phosphorylcholine-terminated polymer grafted onto (3-aminopropyl)trimethoxysilane. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:9651-7. [PMID: 17073492 DOI: 10.1021/la060586o] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The structure of a biomimetic phosphorylcholine (PC)-functionalized poly(trimethylene carbonate) (PC-PTMC-PC), linked to a silicon substrate through an aminolysis reaction at 120 degrees C with (3-aminopropyl)trimethoxysilane (APTMS), was studied using photoelectron spectroscopy. Two chemical states were found for the unreacted APTMS amine, a neutral state and a protonated state, where the protonated amine on average was situated closer to the silicon substrate than the neutral amine. The experiments also indicated the presence of a third chemical state, where amines interact with unreacted silanol groups. The PTMC chains of the grafted films were found to consist of only 2-3 repeat units, with the grafted chains enriched in the zwitterionic end group, suggesting that these groups are attracted to the surface. This was further supported by the experiments showing that the PC groups were situated deeper within the film.
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Affiliation(s)
- Emma M E Kristensen
- Department of Physics, Box 530, and Department of Materials Chemistry, Polymer Chemistry, Box 538, Uppsala University, SE-751 21 Uppsala, Sweden.
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Jordan SW, Faucher KM, Caves JM, Apkarian RP, Rele SS, Sun XL, Hanson SR, Chaikof EL. Fabrication of a phospholipid membrane-mimetic film on the luminal surface of an ePTFE vascular graft. Biomaterials 2006; 27:3473-81. [PMID: 16516285 DOI: 10.1016/j.biomaterials.2006.01.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2005] [Accepted: 01/03/2006] [Indexed: 10/25/2022]
Abstract
A stabilized, membrane-mimetic film was produced on the luminal surface of an ePTFE vascular graft by in situ photopolymerization of an acrylate functonalized phospholipid using a fiber optic diffusing probe. The phospholipid monomer was synthesized, prepared as unilamellar vesicles, and fused onto close-packed octadecyl chains that were components of an amphiphilic terpolymer anchored onto the polyelectrolyte multilayer (PEM) by electrostatic interactions. Scanning electron microscopy (SEM) confirmed that gelatin impregnation of the graft followed by the subsequent biomimetic film coating filled in the fibril and node structure of the luminal surface of the ePTFE graft and was smooth. The lipid film displayed an initial advancing contact angle of 44 degrees , which increased to 55 degrees after being subjected to a wall shear rate of 500s(-1) for 24h at 37 degrees C in phosphate buffered saline (PBS). Fourier transform (FT-IR) spectroscopy was used to characterize the stages of biomimetic film assembly and confirmed the stability of the film under shear flow conditions. In vivo assessment using a baboon femoral arteriovenous shunt model demonstrated minimal platelet and fibrinogen deposition over a 1-h blood-contacting period. The results of this study confirm the versatility of a biomimetic film coating system by successfully transferring the methodology previously developed for planar substrates to the luminal surface of an ePTFE vascular graft.
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Affiliation(s)
- Sumanas W Jordan
- Department of Surgery and Biomedical Engineering, Emory University, 1639 Pierce Drive, Room 5105, Atlanta, GA 30322, USA
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Yaseen M, Wang Y, Su TJ, Lu JR. Surface adsorption of zwitterionic surfactants: n-alkyl phosphocholines characterised by surface tensiometry and neutron reflection. J Colloid Interface Sci 2005; 288:361-70. [PMID: 15927600 DOI: 10.1016/j.jcis.2005.03.024] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2005] [Revised: 03/06/2005] [Accepted: 03/11/2005] [Indexed: 10/25/2022]
Abstract
The surface adsorption of n-dodecyl phosphocholine (C12PC) has been characterised by a combined measurement of surface tension and neutron reflectivity. The critical micellar concentration (CMC) was found to be 0.91 mM at 25 degrees C in pure water. At the CMC, the limiting area per molecule (A(cmc)) was found to be 52+/-3 A2 and the surface tension (gamma(cmc)) to be ca. 40.0+/-0.5 mN/m. The parallel study of chain isomer n-hexadecyl phosphocholine (C16PC) showed a decrease of the CMC to 0.012 mM and a drop of gamma(cmc) to 38.1+/-0.5 mN/m. However, A(cmc) for C16PC was found to be 54+/-3 A2, showing that increase in alkyl chain length by four methylene groups has little effect on A(cmc). The almost constant A(cmc) suggested that the limiting area per molecule was determined by the bulky PC head group. It was further found that the surface tension and related key physical parameters did not vary much with temperature, salt addition, solution pH or any combination of these, thus showing that surface adsorption and solution aggregation from PC surfactants is largely similar to the zwitterionic betaine surfactants and is distinctly different from ionic and non-ionic surfactants. The thickness of the adsorbed monolayers measured from both dC12hPC and dC16hPC was found to be 20-22 A at the CMC from neutron reflectivity. Neither A(cmc) nor layer thickness varied with alkyl chain length, indicating that as the alkyl chain length became longer it was further tilted away from the surface normal direction and the layer packing density increased. It was also observed that the thickness of the layer varied little with surfactant concentration, indicating that the average conformational orientation of the alkyl chain remained unchanged against varying surface coverage.
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Affiliation(s)
- M Yaseen
- Biological Physics Group, School of Physics and Astronomy, University of Manchester, P.O. Box 88, Sackville Street, Manchester M60 1QD, UK
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7
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Iwasaki Y, Ishihara K. Phosphorylcholine-containing polymers for biomedical applications. Anal Bioanal Chem 2004; 381:534-46. [PMID: 15723256 DOI: 10.1007/s00216-004-2805-9] [Citation(s) in RCA: 236] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2004] [Revised: 08/02/2004] [Accepted: 08/06/2004] [Indexed: 12/19/2022]
Affiliation(s)
- Yasuhiko Iwasaki
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-surugadai, Chiyoda-ku, Tokyo 101-0062, Japan.
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Wilson DJ, Rhodes NP, Williams RL. Surface modification of a segmented polyetherurethane using a low-powered gas plasma and its influence on the activation of the coagulation system. Biomaterials 2003; 24:5069-81. [PMID: 14568423 DOI: 10.1016/s0142-9612(03)00423-x] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A medical grade segmented polyetherurethane (PEU) was treated with a low-powered gas plasma using O(2), Ar, N(2) and NH(3) as the treatment gases. Changes in the surface functional group chemistry were studied using X-ray photoelectron spectroscopy. The wettability of the surfaces was examined using dynamic contact angle measurements and the surface morphology was evaluated using atomic force microscopy. The influence of the surface modification to the polyurethane on the blood response to the polyetherurethane was investigated by measuring changes in the activation of the contact phase activation of the intrinsic coagulation cascade. The data demonstrate that the plasma treatment process caused surface modifications to the PEU that in all cases increased the polar nature of the surfaces. O(2) and Ar plasmas resulted in the incorporation of oxygen-containing groups that remained present following storage in an aqueous environment. N(2) and NH(3) plasmas resulted in the incorporation of nitrogen-containing groups but these were replaced with oxygen-containing groups following storage in the aqueous environment. In all plasma treatments there was a lowering of contact phase activation compared to the untreated surface, the N(2) and NH(3) treatments dramatically so.
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Affiliation(s)
- D J Wilson
- Department of Clinical Engineering, University of Liverpool, Duncan Building Daulby Street, Liverpool L69 3GA, UK
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Matsuda T, Nagase J, Ghoda A, Hirano Y, Kidoaki S, Nakayama Y. Phosphorylcholine-endcapped oligomer and block co-oligomer and surface biological reactivity. Biomaterials 2003; 24:4517-27. [PMID: 12922161 DOI: 10.1016/s0142-9612(03)00344-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Phosphorylcholine (PC)-endcapped oligomer and block co-oligomer were prepared by employing a photoiniferter-based quasi-living polymerization technique. The designed oligomer had a PC polar head group attached to an alkylene chain at one end of the molecule and an oligo(styrene) (oligoST) segment at the other end. In the co-oligomer, an oligo(N,N-dimethylacrylamide) (oligoDMAAm) segment was inserted between both ends of the oligomer mentioned above. Surface coating of these amphiphilic substances, using an appropriate coating procedure, resulted in a very hydrophilic characteristic, suggesting that the oligoST anchored on the substrate and the PC polar head group was exposed to or located on the outer coating layer. Non-cell adhesivity in serum-containing medium was observed, while slightly reduced protein adsorption was observed. Thus, PC-endcapped oligomer and block co-oligomer appear to function as a biocompatible coating.
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Affiliation(s)
- Takehisa Matsuda
- National Cardiovascular Center Research Institute, Department of Bioengineering, 5-7-1, Fujishiro-dai, Suita, Osaka 565-8565, Japan.
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Ma Y, Tang Y, Billingham NC, Armes SP, Lewis AL, Lloyd AW, Salvage JP. Well-Defined Biocompatible Block Copolymers via Atom Transfer Radical Polymerization of 2-Methacryloyloxyethyl Phosphorylcholine in Protic Media. Macromolecules 2003. [DOI: 10.1021/ma021762c] [Citation(s) in RCA: 187] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | | | - Andrew L. Lewis
- Biocompatibles, Chapman House, Farnham Business Park, Weydon Lane, Farnham, Surrey GU9 8QL, UK
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11
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Vermette P, Meagher L. Interactions of phospholipid- and poly(ethylene glycol)-modified surfaces with biological systems: relation to physico-chemical properties and mechanisms. Colloids Surf B Biointerfaces 2003. [DOI: 10.1016/s0927-7765(02)00160-1] [Citation(s) in RCA: 191] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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12
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Phosphorylcholine-based polymers and their use in the prevention of biofouling. Colloids Surf B Biointerfaces 2000; 18:261-275. [PMID: 10915948 DOI: 10.1016/s0927-7765(99)00152-6] [Citation(s) in RCA: 348] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This article provides an overview of work carried out on the synthesis and non-fouling properties of phosphorylcholine (PC)-containing polymers. The concept of biomimicry is outlined and the major classes of synthetic PC-based materials described. Studies on the interaction of these materials with various proteins are collated and the mechanism for their protein-resistant nature is discussed. Similarly, cellular interactions are also reviewed, with ex-vivo and in-vivo clinical data provided to demonstrate the usefulness of these materials for improving the properties of medical devices.
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Orban JM, Faucher KM, Dluhy RA, Chaikof EL. Cytomimetic Biomaterials. 4. In-Situ Photopolymerization of Phospholipids on an Alkylated Surface. Macromolecules 2000. [DOI: 10.1021/ma9915780] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Janine M. Orban
- Departments of Surgery and Bioengineering, Emory University School of Medicine, Atlanta, Georgia 30322, School of Chemical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30320, and Department of Chemsitry, University of Georgia, Athens, Georgia
| | - Keith M. Faucher
- Departments of Surgery and Bioengineering, Emory University School of Medicine, Atlanta, Georgia 30322, School of Chemical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30320, and Department of Chemsitry, University of Georgia, Athens, Georgia
| | - Richard A. Dluhy
- Departments of Surgery and Bioengineering, Emory University School of Medicine, Atlanta, Georgia 30322, School of Chemical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30320, and Department of Chemsitry, University of Georgia, Athens, Georgia
| | - Elliot L. Chaikof
- Departments of Surgery and Bioengineering, Emory University School of Medicine, Atlanta, Georgia 30322, School of Chemical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30320, and Department of Chemsitry, University of Georgia, Athens, Georgia
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14
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Chon JH, Marra KG, Chaikof EL. Cytomimetic biomaterials. 3. Preparation and transport studies of an alginate/amphiphilic copolymer/polymerized phospholipid film. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 1999; 10:95-107. [PMID: 10091925 DOI: 10.1163/156856299x00306] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The significance of molecular design methodologies based upon membrane-mimetic systems lies in the ability to engineer robust materials of varying geometry with a high degree of reproducibility and molecular control over surface order and chemistry. However, non-covalently associated assemblies, in and of themselves, are often insufficiently robust for many applications. We have previously reported the in situ polymerization of a single phospholipid monolayer on a self-assembled film of octadecyltrichrolosilane (OTS) on glass, as well as the polymerization of phospholipids on an amphiphilic, dialkyl-containing terpolymer bound to a gold-coated silicon wafer. We now report the polymerization of a phospholipid monolayer assembly onto an alkylated hydrogel substrate with significant alteration in both surface chemistry and mass transport properties at the hydrogel-water interface. A general platform is thereby created for enhancing the control of either the local delivery of specific macromolecules or the immunoisolation barrier for many cell based therapies.
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Affiliation(s)
- J H Chon
- Department of Surgery, Emory University School of Medicine, Atlanta, GA 30322, USA
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15
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Marra KG, Winger TM, Hanson SR, Chaikof EL. Cytomimetic Biomaterials. 1. In-Situ Polymerization of Phospholipids on an Alkylated Surface. Macromolecules 1997. [DOI: 10.1021/ma970481f] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kacey Gribbin Marra
- Department of Surgery, Emory University School of Medicine, Atlanta, Georgia 30322, and School of Chemical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30320
| | - Theodore M. Winger
- Department of Surgery, Emory University School of Medicine, Atlanta, Georgia 30322, and School of Chemical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30320
| | - Stephen R. Hanson
- Department of Surgery, Emory University School of Medicine, Atlanta, Georgia 30322, and School of Chemical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30320
| | - Elliot L. Chaikof
- Department of Surgery, Emory University School of Medicine, Atlanta, Georgia 30322, and School of Chemical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30320
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Gref R, Minamitake Y, Peracchia MT, Domb A, Trubetskoy V, Torchilin V, Langer R. Poly(ethylene glycol)-coated nanospheres: potential carriers for intravenous drug administration. PHARMACEUTICAL BIOTECHNOLOGY 1997; 10:167-98. [PMID: 9160372 DOI: 10.1007/0-306-46803-4_6] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- R Gref
- Laboratoire de Chimie-Physique Macromoléculaire (URA CNRS 494), ENSIC, Nancy, France
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Abstract
Consideration of biomaterials for blood-contacting applications should take into account blood-biomaterial interactions, factors influencing the blood response and evaluation procedures. Examination of blood-biomaterial interactions indicates that relevant features are protein adsorption, platelet reactions, intrinsic coagulation, fibrinolytic activity, erythrocytes, leucocytes and complement activation. Factors influencing the blood response to a biomaterial in clinical application are the biomaterial structure, the presence of an antithrombotic agent, the patient status as determined by the disease and drug therapy, and the nature of the application. Evaluation options for biomaterials are clinical, in vivo, ex vivo and in vitro, with ex vivo and in vitro procedures relevant for biomaterial development.
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Affiliation(s)
- J M Courtney
- Bioengineering Unit, University of Strathclyde, Glasgow, UK
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18
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Abstract
Occlusion of chest drainage tubes by thrombus is not uncommon after open heart operations. It has been suggested that by coating the tube with phosphatidylcholine (PC), the most prominent phospholipid in the erythrocytes outer membrane, it may be possible to overcome the blood-material interaction responsible for thrombus formation. To test this hypothesis 102 patients (75 males; mean age, 57 +/- 10 years) were randomly allocated to receive either PC-coated or noncoated 32F chest drainage tubes. Preoperative status, type and length of operation, and duration of drainage were similar in the two groups as was postoperative blood loss. Patients receiving PC-coated tubes, however, had less residual blood clot in the tube after removal (0.7 +/- 0.1 versus 3.1 +/- 0.3 g; p < 0.001), a reduced incidence of pericardial effusions (17.6% versus 41.2%; p < 0.01), fewer postoperative supraventricular arrhythmias (2 of 51 versus 10 of 51; p < 0.002), and a shorter hospital stay (8.4 +/- 0.3 versus 9.7 +/- 0.5 days; p < 0.05). Late cardiac tamponade developed in 2 patients in the noncoated group 6 and 10 days postoperatively, which required reexploration. The data show that PC-coated chest drainage tubes are less susceptible to occlusion by thrombus and their use is associated with a significant reduction in postoperative morbidity.
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Affiliation(s)
- S Hunter
- Department of Cardiac Surgery, University of Sheffield, United Kingdom
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Hall B, Bird RR, Kojima M, Chapman D. Biomembranes as models for polymer surfaces. V. Thrombelastographic studies of polymeric lipids and polyesters. Biomaterials 1989; 10:219-24. [PMID: 2525934 DOI: 10.1016/0142-9612(89)90096-3] [Citation(s) in RCA: 64] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Our approach to the design of haemocompatible biomaterials is based upon the concept that coating a polymer or metal surface with phosphatidylcholine polar groups (corresponding to the major phospholipid of the human erythrocyte outer cell membrane) will improve their haemocompatibility. We have examined the effect on blood coagulation of a number of substrates: those normally used in prosthetic devices such as polyethylene terephthalate (Dacron), expanded polytetrafluoroethylene, silicone and new polymers which contain the phosphatidylcholine head group (phosphorylcholine). The effect on coagulation of blood exposed to these substrates was determined by the technique of material thrombelastography, a relatively new method for the in vitro screening of biomaterial thrombogenicity. The results obtained with Dacron, polytetrafluoroethylene and silicone are compared with those obtained with a phospholipid-dipalmitoyl-phosphatidylcholine, a polymerized phospholipid-diacetylenicphosphatidylcholine, and a range of recently synthesized polyesters, each of which contains the phosphorylcholine polar head group.
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Affiliation(s)
- B Hall
- Department of Protein and Molecular Biology, Royal Free Hospital School of Medicine, University of London, UK
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Kallury KM, Ghaemmaghami V, Krull U, Thompson M, Davies MC. Immobilization of phospholipids on silicon, platinum, indium/tin oxide and gold surfaces with characterization by x-ray photoelectron spectroscopy and time-of-flight secondary-ion mass spectrometry. Anal Chim Acta 1989. [DOI: 10.1016/s0003-2670(00)84626-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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