1
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Xu LC, Siedlecki CA. Surface Texturing and Combinatorial Approaches to Improve Biocompatibility of Implanted Biomaterials. FRONTIERS IN PHYSICS 2022; 10:994438. [PMID: 38250242 PMCID: PMC10798815 DOI: 10.3389/fphy.2022.994438] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Abstract
Biomaterial associated microbial infection and blood thrombosis are two of the barriers that inhibit the successful use of implantable medical devices in modern healthcare. Modification of surface topography is a promising approach to combat microbial infection and thrombosis without altering bulk material properties necessary for device function and without contributing to bacterial antibiotic resistance. Similarly, the use of other antimicrobial techniques such as grafting poly(ethylene glycol) (PEG) and nitric oxide (NO) release also improve the biocompatibility of biomaterials. In this review, we discuss the development of surface texturing techniques utilizing ordered submicron-size pillars for controlling bacterial adhesion and biofilm formation, and we present combinatorial approaches utilizing surface texturing in combination with poly(ethylene glycol) (PEG) grafting and NO release to improve the biocompatibility of biomaterials. The manuscript also discusses efforts towards understanding the molecular mechanisms of bacterial adhesion responses to the surface texturing and NO releasing biomaterials, focusing on experimental aspects of the approach.
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Affiliation(s)
- Li-Chong Xu
- Department of Surgery, The Pennsylvania State University, College of Medicine, Hershey, PA 17033
| | - Christopher A. Siedlecki
- Department of Surgery, The Pennsylvania State University, College of Medicine, Hershey, PA 17033
- Department of Biomedical Engineering, The Pennsylvania State University, College of Medicine, Hershey, PA 17033
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Wang XT, Deng X, Zhang TD, Zhang J, Chen LL, Wang YF, Cao X, Zhang YZ, Zheng X, Yin DC. A Versatile Hydrophilic and Antifouling Coating Based on Dopamine Modified Four-Arm Polyethylene Glycol by One-Step Synthesis Method. ACS Macro Lett 2022; 11:805-812. [PMID: 35666550 DOI: 10.1021/acsmacrolett.2c00277] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A versatile hydrophilic and antifouling coating was designed and prepared based on catechol-modified four-arm polyethylene glycol. The dopamine (DA) molecules were grafted onto the end of the four-arm polyethylene glycol carboxyl (4A-PEG-COOH) through the amidation reaction, which was proven by 1H NMR and FTIR analysis, assisting the strong adhesion of PEG on the surface of various types of materials, including metallic, inorganic, and polymeric materials. The reduction of the water contact angle and the bacteria-repellent and protein-repellent effects indicated that the coating had good hydrophilicity and antifouling performance. Raman spectroscopy analysis demonstrated the affinity between the polymeric surface and water, which further confirmed the hydrophilicity of the coating. Finally, in vitro cytotoxicity assay demonstrated good biocompatibility of the coating layer.
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Affiliation(s)
- Xue-Ting Wang
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an 710072, China
| | - Xudong Deng
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an 710072, China
| | - Tuo-Di Zhang
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an 710072, China.,Research Center of Clinical Medicine, Affiliated Hospital of Nantong University, Nantong 226001, China
| | - Jie Zhang
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an 710072, China
| | - Liang-Liang Chen
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an 710072, China
| | - Yi-Fan Wang
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China
| | - Xin Cao
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China
| | - Yao-Zhong Zhang
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China
| | - Xing Zheng
- State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China
| | - Da-Chuan Yin
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an 710072, China
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3
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High density star poly HEMA containing bis-indole rich dendrimer inner core for integrated anti-fouling and anti-bacterial coating applications. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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4
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Ammann KR, Hossainy SFA, Hossainy S, Slepian MJ. Hemocompatibility of polymers for use in vascular endoluminal implants. J Appl Polym Sci 2021. [DOI: 10.1002/app.51277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Kaitlyn R. Ammann
- Department of Medicine College of Medicine, University of Arizona Tucson Arizona USA
- Sarver Heart Center, Arizona Health Sciences Center University of Arizona Tucson Arizona USA
| | - Syed F. A. Hossainy
- Department of Bioengineering College of Engineering, University of California Berkeley Berkeley California USA
| | - Sahir Hossainy
- Sarver Heart Center, Arizona Health Sciences Center University of Arizona Tucson Arizona USA
| | - Marvin J. Slepian
- Department of Medicine College of Medicine, University of Arizona Tucson Arizona USA
- Sarver Heart Center, Arizona Health Sciences Center University of Arizona Tucson Arizona USA
- Department of Biomedical Engineering College of Engineering, University of Arizona Tucson Arizona USA
- Department of Materials Science and Engineering College of Engineering, University of Arizona Tucson Arizona USA
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5
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Hasan MT, Gonzalez R, Chipara M, Materon L, Parsons J, Alcoutlabi M. Antibacterial activities of centrifugally spun polyethylene oxide/silver composite nanofibers. POLYM ADVAN TECHNOL 2021. [DOI: 10.1002/pat.5261] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Md Toukir Hasan
- Mechanical Engineering Department University of Texas Rio Grande Valley Edinburg Texas USA
| | - Ramiro Gonzalez
- Mechanical Engineering Department University of Texas Rio Grande Valley Edinburg Texas USA
| | - Mircea Chipara
- Physics and Astronomy Department University of Texas Rio Grande Valley Edinburg Texas USA
| | - Luis Materon
- Department of Biology University of Texas Rio Grande Valley Edinburg Texas USA
| | - Jason Parsons
- Department of Chemistry University of Texas Rio Grande Valley Edinburg Texas USA
| | - Mataz Alcoutlabi
- Mechanical Engineering Department University of Texas Rio Grande Valley Edinburg Texas USA
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6
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Oh HJ, Aboian MS, Yi MYJ, Maslyn JA, Loo WS, Jiang X, Parkinson DY, Wilson MW, Moore T, Yee CR, Robbins GR, Barth FM, DeSimone JM, Hetts SW, Balsara NP. 3D Printed Absorber for Capturing Chemotherapy Drugs before They Spread through the Body. ACS CENTRAL SCIENCE 2019; 5:419-427. [PMID: 30937369 PMCID: PMC6439445 DOI: 10.1021/acscentsci.8b00700] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Indexed: 05/05/2023]
Abstract
Despite efforts to develop increasingly targeted and personalized cancer therapeutics, dosing of drugs in cancer chemotherapy is limited by systemic toxic side effects. We have designed, built, and deployed porous absorbers for capturing chemotherapy drugs from the bloodstream after these drugs have had their effect on a tumor, but before they are released into the body where they can cause hazardous side effects. The support structure of the absorbers was built using 3D printing technology. This structure was coated with a nanostructured block copolymer with outer blocks that anchor the polymer chains to the 3D printed support structure and a middle block that has an affinity for the drug. The middle block is polystyrenesulfonate which binds to doxorubicin, a widely used and effective chemotherapy drug with significant toxic side effects. The absorbers are designed for deployment during chemotherapy using minimally invasive image-guided endovascular surgical procedures. We show that the introduction of the absorbers into the blood of swine models enables the capture of 64 ± 6% of the administered drug (doxorubicin) without any immediate adverse effects. Problems related to blood clots, vein wall dissection, and other biocompatibility issues were not observed. This development represents a significant step forward in minimizing toxic side effects of chemotherapy.
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Affiliation(s)
- Hee Jeung Oh
- Department
of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States
| | - Mariam S. Aboian
- Department
of Radiology, School of Medicine, University
of California, San Francisco, California 94110, United States
| | - Michael Y. J. Yi
- Department
of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States
| | - Jacqueline A. Maslyn
- Department
of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States
- Energy Storage and Distributed
Resources Division, Joint Center for Energy Storage Research
(JCESR), Materials Sciences Division, Advanced Light Source Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Whitney S. Loo
- Department
of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States
| | - Xi Jiang
- Energy Storage and Distributed
Resources Division, Joint Center for Energy Storage Research
(JCESR), Materials Sciences Division, Advanced Light Source Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Dilworth Y. Parkinson
- Energy Storage and Distributed
Resources Division, Joint Center for Energy Storage Research
(JCESR), Materials Sciences Division, Advanced Light Source Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Mark W. Wilson
- Department
of Radiology, School of Medicine, University
of California, San Francisco, California 94110, United States
| | - Terilyn Moore
- Department
of Radiology, School of Medicine, University
of California, San Francisco, California 94110, United States
| | - Colin R. Yee
- Department
of Radiology, School of Medicine, University
of California, San Francisco, California 94110, United States
| | - Gregory R. Robbins
- Carbon,
Inc., 1089 Mills Way, Redwood City, California 94063, United States
| | - Florian M. Barth
- Carbon,
Inc., 1089 Mills Way, Redwood City, California 94063, United States
| | - Joseph M. DeSimone
- Carbon,
Inc., 1089 Mills Way, Redwood City, California 94063, United States
- Department
of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, United States
- Department
of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Steven W. Hetts
- Department
of Radiology, School of Medicine, University
of California, San Francisco, California 94110, United States
| | - Nitash P. Balsara
- Department
of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States
- Energy Storage and Distributed
Resources Division, Joint Center for Energy Storage Research
(JCESR), Materials Sciences Division, Advanced Light Source Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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Berri N, Fares J, Fares Y. Polyethylene Oxide and Silicon-Substituted Hydroxyapatite Composite: A Biomaterial for Hard Tissue Engineering in Orthopedic and Spine Surgery. Adv Biomed Res 2018; 7:117. [PMID: 30211130 PMCID: PMC6124219 DOI: 10.4103/abr.abr_206_17] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND Tissue engineering and biomaterials have made it possible to innovate bone treatments for orthopedic and spine problems. The aim of this study is to develop a novel polyethylene oxide (PEO)/silicon-substituted hydroxyapatite (Si-HA) composite to be used as a scaffold for hard tissue engineering in orthopedic and spine procedures. MATERIALS AND METHODS The composite was fabricated through the electrospinning technique. The applied voltage (5 kV) and PEO concentration (5%) were fixed. Processing parameters such as the flow rates (20 μl/min and 50 μl/min), distances from capillary tube to the collector (130 mm and 180 mm), spinning time (10 min and 20 min), and concentration of Si-HA (0.2% and 0.6%) were explored to find the optimum conditions to produce fine composite fibers. RESULTS Scanning electron microscope images showed that 5% PEO, 5% PEO/0.2% Si-HA, and 5% PEO/0.6% Si-HA fibers were successively produced. Flow rates and working distances showed significant influence on the morphology of the polymeric and composite fibers. A high flow rate (50 μl/min) and a larger working distance (180 mm) resulted in larger fibers. The comparison between the mean fiber diameter of 5% PEO/0.2% Si-HA and 5% PEO/0.6% Si-HA showed to be significantly different. As the Si-HA concentration increased, certain fibers were having particles of Si-HA that were not properly integrated into the polymer matrix. CONCLUSIONS Synthesis of a novel biomaterial for hard tissue scaffold through electrospinning was successful. In general, PEO/Si-HA fibers produced have the desired characteristics to mimic the extracellular matrix of bone.
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Affiliation(s)
- Nael Berri
- From the Department of Mechanical Engineering, University College London, London, UK
- Neuroscience Research Center, Faculty of Medicine, Lebanese University, Beirut, Lebanon
| | - Jawad Fares
- Neuroscience Research Center, Faculty of Medicine, Lebanese University, Beirut, Lebanon
- Department of Neurosurgery, Faculty of Medicine, Lebanese University, Beirut, Lebanon
- Department of Neurological Surgery, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Youssef Fares
- Neuroscience Research Center, Faculty of Medicine, Lebanese University, Beirut, Lebanon
- Department of Neurosurgery, Faculty of Medicine, Lebanese University, Beirut, Lebanon
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8
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Ban C, Jo M, Lim S, Choi YJ. Control of the gastrointestinal digestion of solid lipid nanoparticles using PEGylated emulsifiers. Food Chem 2018; 239:442-452. [DOI: 10.1016/j.foodchem.2017.06.137] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Revised: 05/22/2017] [Accepted: 06/26/2017] [Indexed: 11/28/2022]
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9
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Biocompatibility of hydrogel-based scaffolds for tissue engineering applications. Biotechnol Adv 2017; 35:530-544. [DOI: 10.1016/j.biotechadv.2017.05.006] [Citation(s) in RCA: 407] [Impact Index Per Article: 58.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Revised: 05/08/2017] [Accepted: 05/22/2017] [Indexed: 12/15/2022]
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10
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Horiguchi Y, Nakayama N, Kanayama N, Nagasaki Y. Sulfobetaine-terminated PEG improves the qualities of an immunosensing surface. Biomater Sci 2016; 2:819-26. [PMID: 26827755 DOI: 10.1039/c3bm60212e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Poly(ethylene glycol) (PEG) possessing a sulfobetaine (SB) moiety at one end and a pentaethylenehexamine (N6) at the other end (SB-PEG-N6) was newly synthesized as a blocking agent for immunosensing surfaces. The N6 moiety strongly coordinates on gold surfaces, facilitating the tethering of the PEG chain to the sensor chip surface, and leaves the SB moiety free. Non-specific adsorption of bovine serum albumin (BSA) was analyzed on the SB-PEG-N6 tethered surface and compared with the methoxy-PEG-N6 (M-PEG-N6) tethered surface using a surface plasmon resonance (SPR) sensor. Non-specific BSA adsorption decreased with decreasing PEG chain length on the SB-PEG tethered chain surface. Non-specific adsorption of BSA decreased as ionic strength increased on SB-PEG-N6 surfaces; this phenomenon was completely opposite to that observed with an M-PEG-N6 tethered chain surface. The results show that SB moieties located close to the gold surface perform well with regard to protein rejection. Actually, low-molecular weight alkane thiol SB (SB-SH) showed minimum BSA adsorption. To evaluate protein recognition efficacy on a PEGylated surface, an antibody (IgG) immobilized surface was then constructed on a gold sensor chip using SB-PEG-N6 as the blocking agent. The specific protein recognition efficacy of SB-PEG-N6/IgG co-immobilized surfaces was higher than that obtained using SB-SH/IgG co-immobilized surfaces. We conclude that SB-terminated PEG exhibits the optimal qualities of a blocking agent, as it possesses both high suppression efficacy of nonspecific protein adsorption and specific protein recognition ability.
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Affiliation(s)
- Yukichi Horiguchi
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
| | - Naoki Nakayama
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
| | - Naoki Kanayama
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
| | - Yukio Nagasaki
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan and Master's School of Medical Sciences, University of Tsukuba, Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan and Satellite Laboratory of International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute of Materials Science (NIMS), Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan.
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11
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Zhou T, Zhao X, Liu L, Liu P. Preparation of biodegradable PEGylated pH/reduction dual-stimuli responsive nanohydrogels for controlled release of an anti-cancer drug. NANOSCALE 2015; 7:12051-12060. [PMID: 26118938 DOI: 10.1039/c5nr00758e] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A facile and efficient method was developed to prepare the monodisperse biodegradable PEGylated pH and reduction dual-stimuli sensitive poly[methacrylic acid-co-poly(ethylene glycol) methyl ether methacrylate-co-N,N-bis(acryloyl)cystamine] (PMPB) nanohydrogels with dried particle size below 200 nm via one-step distillation precipitation polymerization as a drug delivery system (DDS) for the controlled release of a wide-spectrum anti-cancer drug, doxorubicin hydrochloride (DOX). Under normal physiological media, the nanohydrogels possessed high drug encapsulation efficiency (more than 96%) within 48 h and exhibited good stability with a trifle premature drug release. However, rapid DOX release was achieved at lower pH or in the presence of reductive reagent glutathione (GSH) with a cumulative release of more than 85% within 30 h. Furthermore, the nanohydrogels manifested nontoxicity on HepG2 cells at a concentration of 10 μg mL(-1) or lower. Based on the excellent characteristics of the nanohydrogels, such as low toxicity, impressive biodegradability, sharp dual responsiveness, adequate drug loading capacity and a high drug encapsulation efficiency, they were supposed to have potential application in the area of cancer therapy.
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Affiliation(s)
- Tingting Zhou
- State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.
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12
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ANDO T. Star Polymers for Biomedical Applications. KOBUNSHI RONBUNSHU 2015. [DOI: 10.1295/koron.2015-0009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Tsuyoshi ANDO
- Graduate School of Materials Science, Nara Institute of Science and Technology
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13
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Xu LC, Bauer JW, Siedlecki CA. Proteins, platelets, and blood coagulation at biomaterial interfaces. Colloids Surf B Biointerfaces 2014; 124:49-68. [PMID: 25448722 PMCID: PMC5001692 DOI: 10.1016/j.colsurfb.2014.09.040] [Citation(s) in RCA: 248] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 09/15/2014] [Accepted: 09/18/2014] [Indexed: 12/24/2022]
Abstract
Blood coagulation and platelet adhesion remain major impediments to the use of biomaterials in implantable medical devices. There is still significant controversy and question in the field regarding the role that surfaces play in this process. This manuscript addresses this topic area and reports on state of the art in the field. Particular emphasis is placed on the subject of surface engineering and surface measurements that allow for control and observation of surface-mediated biological responses in blood and test solutions. Appropriate use of surface texturing and chemical patterning methodologies allow for reduction of both blood coagulation and platelet adhesion, and new methods of surface interrogation at high resolution allow for measurement of the relevant biological factors.
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Affiliation(s)
- Li-Chong Xu
- Department of Surgery, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States
| | - James W Bauer
- Department of Bioengineering, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States
| | - Christopher A Siedlecki
- Department of Surgery, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States; Department of Bioengineering, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States.
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14
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Totani M, Ando T, Terada K, Terashima T, Kim IY, Ohtsuki C, Xi C, Kuroda K, Tanihara M. Utilization of star-shaped polymer architecture in the creation of high-density polymer brush coatings for the prevention of platelet and bacteria adhesion. Biomater Sci 2014; 2:1172-1185. [PMID: 25485105 PMCID: PMC4251873 DOI: 10.1039/c4bm00034j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We demonstrate utilization of star-shaped polymers as high-density polymer brush coatings and their effectiveness to inhibit the adhesion of platelets and bacteria. Star polymers consisting of poly(2-hydroxyethyl methacrylate) (PHEMA) and/or poly(methyl methacrylate) (PMMA), were synthesized using living radical polymerization with a ruthenium catalyst. The polymer coatings were prepared by simple drop casting of the polymer solution onto poly(ethylene terephthalate) (PET) surfaces and then dried. Among the star polymers prepared in this study, the PHEMA star polymer (star-PHEMA) and the PHEMA/PMMA (mol. ratio of 71/29) heteroarm star polymer (star-H71M29) coatings showed the highest percentage of inhibition against platelet adhesion (78-88% relative to noncoated PET surface) and Escherichia coli (94-97%). These coatings also showed anti-adhesion activity against platelets after incubation in Dulbecco's phosphate buffered saline or surfactant solution for 7 days. In addition, the PMMA component of the star polymers increased the scratch resistance of the coating. These results indicate that the star-polymer architecture provides high polymer chain density on PET surfaces to prevent adhesion of platelets and bacteria, as well as coating stability and physical durability to prevent exposure of bare PET surfaces. The star polymers provide a simple and effective approach to preparing anti-adhesion polymer coatings on biomedical materials against the adhesion of platelets and bacteria.
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Affiliation(s)
- Masayasu Totani
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0192, Japan
| | - Tsuyoshi Ando
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0192, Japan
| | - Kayo Terada
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0192, Japan
| | - Takaya Terashima
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Ill Yong Kim
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Naogya 464-8603, Japan
| | - Chikara Ohtsuki
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Naogya 464-8603, Japan
| | - Chuanwu Xi
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Kenichi Kuroda
- Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Masao Tanihara
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0192, Japan
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15
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Modeling of cancer metastasis and drug resistance via biomimetic nano-cilia and microfluidics. Biomaterials 2014; 35:1562-71. [DOI: 10.1016/j.biomaterials.2013.11.008] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Accepted: 11/02/2013] [Indexed: 01/17/2023]
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16
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Silvestri B, Guarnieri D, Luciani G, Costantini A, Netti PA, Branda F. Fluorescent (rhodamine), folate decorated and doxorubicin charged, PEGylated nanoparticles synthesis. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:1697-1704. [PMID: 22484837 DOI: 10.1007/s10856-012-4634-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Accepted: 03/26/2012] [Indexed: 05/31/2023]
Abstract
PEGylated silica nanoparticles, giving very stable aqueous sols, were successfully functionalised with rhodamine, one of the more stable fluorophore; they were also decorated with the targeting agent folic acid (FA) and charged with the well known drug doxorubicin. Rhodamine functionalization required a modification of the synthesis route of the nanoparticles (NP). Functionalization with FA required activation with 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride. Folate decorated NP were easily charged with doxorubicin. The experimental results proved the successfulness of the functionalization. The bond to the NP does not reduce the therapeutic efficacy of the drug. The calculated encapsulation efficiency (32 %) was only a little lower than the value (47 %) reported for the very popular PEGylated PLGA NP.
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Affiliation(s)
- B Silvestri
- Department of Materials and Production Engineering, University of Naples Federico II, 80125, Naples, Italy.
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17
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Yamashita S, Fukushima H, Niidome Y, Mori T, Katayama Y, Niidome T. Controlled-release system mediated by a retro Diels-Alder reaction induced by the photothermal effect of gold nanorods. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:14621-14626. [PMID: 21988322 DOI: 10.1021/la2036746] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Controlled-release systems that respond to external stimuli have received great interest for use in medical treatments such as for drug delivery to specific sites. Gold nanorods have an absorption band at the near-infrared region and convert the absorbed light energy into heat, which is known as a "photothermal effect". Therefore, gold nanorods are expected to act not only as an on-demand thermal converter for photothermal therapy but also as a controller of a drug-release system capable of responding to the near-infrared light irradiation. In this study, to construct a controlled-release system that responds to near-infrared light irradiation, we modified gold nanorods with polyethylene glycol (PEG) through Diels-Alder cycloadducts. When the modified gold nanorods were irradiated by near-infrared light, the PEG chains were released from the gold nanorods because of the retro Diels-Alder reaction induced by the photothermal effect. As a result of the PEG release, the gold nanorods formed aggregates. This type of controlled-release system coupled with the aggregate formation of the gold nanorods triggered by near-infrared light could be expanded to applications of gold nanorods in medical fields such as drug and photothermal therapy.
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Affiliation(s)
- Shuji Yamashita
- Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan
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Ovsianikov A, Malinauskas M, Schlie S, Chichkov B, Gittard S, Narayan R, Löbler M, Sternberg K, Schmitz KP, Haverich A. Three-dimensional laser micro- and nano-structuring of acrylated poly(ethylene glycol) materials and evaluation of their cytoxicity for tissue engineering applications. Acta Biomater 2011; 7:967-74. [PMID: 20977947 DOI: 10.1016/j.actbio.2010.10.023] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2010] [Revised: 10/18/2010] [Accepted: 10/20/2010] [Indexed: 12/14/2022]
Abstract
The natural cell environment is characterized by complex three-dimensional structures, which contain features at multiple length scales. Many in vitro studies of cell behavior in three dimensions rely on the availability of artificial scaffolds with controlled three-dimensional topologies. In this paper, we demonstrate fabrication of three-dimensional scaffolds for tissue engineering out of poly(ethylene glycol) diacrylate (PEGda) materials by means of two-photon polymerization (2PP). This laser nanostructuring approach offers unique possibilities for rapid manufacturing of three-dimensional structures with arbitrary geometries. The spatial resolution dependence on the applied irradiation parameters is investigated for two PEGda formulations, which are characterized by molecular weights of 302 and 742. We demonstrate that minimum feature sizes of 200nm are obtained in both materials. In addition, an extensive study of the cytotoxicity of the material formulations with respect to photoinitiator type and photoinitiator concentration is undertaken. Aqueous extracts from photopolymerized PEGda samples indicate the presence of water-soluble molecules, which are toxic to fibroblasts. It is shown that sample aging in aqueous medium reduces the cytotoxicity of these extracts; this mechanism provides a route for biomedical applications of structures generated by 2PP microfabrication and photopolymerization technologies in general. Finally, a fully biocompatible combination of PEGda and a photoinitiator is identified. Fabrication of reproducible scaffold structures is very important for systematic investigation of cellular processes in three dimensions and for better understanding of in vitro tissue formation. The results of this work suggest that 2PP may be used to polymerize poly(ethylene glycol)-based materials into three-dimensional structures with well-defined geometries that mimic the physical and biological properties of native cell environments.
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Affiliation(s)
- A Ovsianikov
- Laser Zentrum Hannover, Hollerithallee 8, Hannover, Germany.
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Yeh PY, Kizhakkedathu JN, Chiao M. A Novel Method to Attenuate Protein Adsorption Using Combinations of Polyethylene Glycol (PEG) Grafts and Piezoelectric Actuation. J Nanotechnol Eng Med 2010. [DOI: 10.1115/1.4002532] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
An antifouling treatment based on the combined effects of grafted polyethylene glycol (PEG) polymers and the application of vibration is reported. A gold-coated lead zirconate titanate piezoelectric composite was grafted with PEG used as a model substrate. The PEG grafted surfaces were thoroughly characterized by attenuated total reflectance-Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. In vitro protein adsorption onto PEG coated surfaces was studied with and without the application of vibration. Bovine serum albumin (BSA) adsorption onto PEG grafted surfaces followed a similar pattern as reported in literature. However, when piezoelectric vibration was applied on the PEG grafted surface, BSA desorption was observed. At very low graft densities, the vibration significantly reduced the BSA adsorption compared with high PEG graft densities. Theoretical calculations showed that the thickness of PEG layer on the surface was affecting vibration induced protein desorption.
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Affiliation(s)
- Po-Ying Yeh
- Department of Mechanical Engineering, University of British Columbia, Vancouver, BC, V6T1Z4, Canada
| | - Jayachandran N. Kizhakkedathu
- Department of Chemistry and Department of Pathology and Laboratory Medicine, Centre for Blood Research, University of British Columbia, Vancouver, BC, V6T1Z4, Canada
| | - Mu Chiao
- Department of Mechanical Engineering, University of British Columbia, Vancouver, BC, V6T1Z4, Canada
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Bamford CH, Al-Lamee KG, Middleton IP, Paprotny J, Carr R. Chemical Modification of Polymers Intended to Increase Blood Compatibility. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19900991109] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Gittard SD, Ovsianikov A, Chichkov BN, Doraiswamy A, Narayan RJ. Two-photon polymerization of microneedles for transdermal drug delivery. Expert Opin Drug Deliv 2010; 7:513-33. [PMID: 20205601 DOI: 10.1517/17425241003628171] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
IMPORTANCE OF THE FIELD Microneedles are small-scale devices that are finding use for transdermal delivery of protein-based pharmacologic agents and nucleic acid-based pharmacologic agents; however, microneedles prepared using conventional microelectronics-based technologies have several shortcomings, which have limited translation of these devices into widespread clinical use. AREAS COVERED IN THIS REVIEW Two-photon polymerization is a laser-based rapid prototyping technique that has been used recently for direct fabrication of hollow microneedles with a wide variety of geometries. In addition, an indirect rapid prototyping method that involves two-photon polymerization and polydimethyl siloxane micromolding has been used for fabrication of solid microneedles with exceptional mechanical properties. WHAT THE READER WILL GAIN In this review, the use of two-photon polymerization for fabricating in-plane and out-of-plane hollow microneedle arrays is described. The use of two-photon polymerization-micromolding for fabrication of solid microneedles is also reviewed. In addition, fabrication of microneedles with antimicrobial properties is discussed; antimicrobial microneedles may reduce the risk of infection associated with the formation of channels through the stratum corneum. TAKE HOME MESSAGE It is anticipated that the use of two-photon polymerization as well as two-photon polymerization-micromolding for fabrication of microneedles and other microstructured drug delivery devices will increase over the coming years.
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Affiliation(s)
- Shaun D Gittard
- University of North Carolina Chapel Hill and North Carolina State University, Joint Department of Biomedical Engineering, CB 7115, 2147 Burlington Labs, Raleigh, NC 27695, USA
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Gittard SD, Ovsianikov A, Akar H, Chichkov B, Monteiro-Riviere NA, Stafslien S, Chisholm B, Shin CC, Shih CM, Lin SJ, Su YY, Narayan RJ. Two Photon Polymerization-Micromolding of Polyethylene Glycol-Gentamicin Sulfate Microneedles. ADVANCED ENGINEERING MATERIALS 2010; 12:B77-B82. [PMID: 21037972 PMCID: PMC2964836 DOI: 10.1002/adem.200980012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The use of microneedles for transdermal drug delivery is limited due to the risk of infection associated with formation of channels through the stratum corneum layer of the epidermis. The risk of infection associated with use of microneedles may be reduced by imparting these devices with antimicrobial properties. In this study, a photopolymerization-micromolding technique was used to fabricate microneedle arrays from a photosensitive material containing polyethylene glycol 600 diacrylate, gentamicin sulfate, and a photoinitiator. Scanning electron microscopy indicated that the photopolymerization-micromolding process produced microneedle arrays that exhibited good microneedle-to-microneedle uniformity. An agar plating assay revealed that microneedles fabricated with polyethylene glycol 600 diacrylate containing 2 mg mL(-1) gentamicin sulfate inhibited growth of Staphylococcus aureus bacteria. Scanning electron microscopy revealed no platelet aggregation on the surfaces of platelet rich plasma-exposed undoped polyethylene glycol 600 diacrylate microneedles and gentamicin-doped polyethylene glycol 600 diacrylate microneedles. These efforts will enable wider adoption of microneedles for transdermal delivery of pharmacologic agents.
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Affiliation(s)
- Shaun D Gittard
- Joint Department of Biomedical Engineering, University of North Carolina, and North Carolina State University, Chapel Hill, Raleigh, NC 27599-7115, USA
| | - Aleksandr Ovsianikov
- Department of Nanotechnology, Laser Zentrum Hannover, Hollerithalle 8, 30419 Hannover, Germany
| | - Hasan Akar
- Department of Nanotechnology, Laser Zentrum Hannover, Hollerithalle 8, 30419 Hannover, Germany
| | - Boris Chichkov
- Department of Nanotechnology, Laser Zentrum Hannover, Hollerithalle 8, 30419 Hannover, Germany
| | - Nancy A Monteiro-Riviere
- Joint Department of Biomedical Engineering, University of North Carolina, and North Carolina State University, Chapel Hill, Raleigh, NC 27599-7115, USA; Center for Chemical Toxicology Research and Pharmacokinetics, North Carolina State University, Raleigh, NC 27695, USA
| | - Shane Stafslien
- Center for Nanoscale Science and Engineering, North Dakota, State University, 1805 Research Park Drive, Fargo, ND, 58102, USA
| | - Bret Chisholm
- Center for Nanoscale Science and Engineering, North Dakota, State University, 1805 Research Park Drive, Fargo, ND, 58102, USA
| | - Chun-Che Shin
- Institute of Clinical Medicine, School of Medicine, National Yang-Ming University, Taipei 112, Taiwan; Division of Cardiovascular Surgery, Taipei Veterans General Hospital, Taipei 112, Taiwan; Cardiovascular Research Center, National Yang-Ming University, Taipei 112, Taiwan
| | - Chun-Ming Shih
- Graduate Institute of Medical Sciences, School of Medicine, Taipei Medical University, Taipei 110, Taiwan
| | - Shing-Jong Lin
- Institute of Clinical Medicine, School of Medicine, National Yang-Ming University, Taipei 112, Taiwan; Cardiovascular Research Center, National Yang-Ming University, Taipei 112, Taiwan; Division of Cardiology, Taipei Veterans General Hospital, Taipei 112, Taiwan
| | - Yea-Yang Su
- Institute of Clinical Medicine, School of Medicine, National Yang-Ming University, Taipei 112, Taiwan
| | - Roger J Narayan
- Joint Department of Biomedical Engineering, University of North Carolina, and North Carolina State University, Chapel Hill, Raleigh, NC 27599-7115, USA
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Abstract
Infections in the setting of orthopaedic hardware remain a serious complication. Traditional treatment modalities rely on antibiotic-loaded biomaterials and/or prolonged intravenous therapy, both of which suffer major limitations. We hypothesized a derivatized form of the glycopeptide antibiotic vancomycin could be covalently attached to a Ti-6Al-4V implant alloy to form a bactericidal surface capable of killing bacteria relevant to orthopaedic infections. First, a polymerizable poly(ethylene glycol)-acrylate derivative of vancomycin was synthesized. This monomer was characterized by liquid chromatography, 1H NMR spectroscopy, and MIC and MBC determination. The monomer was subsequently photochemically polymerized to implant grade Ti-6Al-4V alloy. The coating was bactericidal against Staphylococcus epidermidis through initial release of unattached antibiotic species followed by continued surface-contact-mediated bacterial killing by covalently tethered vancomycin. Through this surface-contact mechanism, the number of colony forming units dropped by ca. fivefold from an initial inoculum of 1 x 10(6) cfu/mL over 4 hours and by ca. 100-fold with respect to nonbactericidal control surfaces. An inoculum of 1 x 10(4) cfu/mL was reduced to undetectable levels over 17 hours. This coating method allows a loading dose several thousand times larger than that achieved with monolayer vancomycin coupling approaches and holds promise for the treatment of orthopaedic infections.
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Affiliation(s)
- McKinley C Lawson
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80309, USA
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Kidoaki S, Matsuda T. Shape-engineered fibroblasts: cell elasticity and actin cytoskeletal features characterized by fluorescence and atomic force microscopy. J Biomed Mater Res A 2007; 81:803-10. [PMID: 17226810 DOI: 10.1002/jbm.a.31114] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The regulation of cell shape, which determines cell behaviors including adhesion, spreading, migration, and proliferation in an engineered artificial extracellular milieu, is an important task in tissue engineering and in development of functional biomaterials. To deepen the understandings of shape-dependent cell mechanics, the cell elasticity and structural features of the actin cytoskeleton (CSK) were characterized for shape-engineered fibroblasts; round and spindle-shaped cells cultured on photolithographically microprocessed surfaces, employing the cellular microindentation tests and fluorescence observation of actin CSK by the combination of atomic force microscopy (AFM) and fluorescence microscopy (FM). The relationships among cell elasticity, the structural features of actin CSK, and engineered cell shape were analyzed and compared with those of control cells that had been cultured on nonprocessed surfaces (termed naturally extended cells). Results showed that the spindle-shaped cells with sparse or no apical stress fibers (ASFs) exhibited similar stiffness to that of the naturally extended cells with dense ASFs. The elasticity of spindle-shaped cells was affected only slightly by the stress fiber (SF) density, which is in marked contrast to the significant correlation shown between cell elasticity and SF density in naturally extended cells. This result implies that the elasticity of regionally restricted adhesion-surface-induced shape-engineered cells, particularly of highly elongated cells, is affected predominantly by cell shape rather than by structural features of SFs.
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Affiliation(s)
- Satoru Kidoaki
- Division of Biomedical Engineering, Graduate School of Medicine, Kyushu University, Fukuoka 812-8582, Japan
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25
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Brétagnol F, Lejeune M, Papadopoulou-Bouraoui A, Hasiwa M, Rauscher H, Ceccone G, Colpo P, Rossi F. Fouling and non-fouling surfaces produced by plasma polymerization of ethylene oxide monomer. Acta Biomater 2006; 2:165-72. [PMID: 16701874 DOI: 10.1016/j.actbio.2005.11.002] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2005] [Revised: 11/07/2005] [Accepted: 11/10/2005] [Indexed: 11/17/2022]
Abstract
This paper presents the results of plasma polymerization using diethylene glycol dimethyl ether as a precursor in a capacitively coupled radio frequency system. The chemical structure of the coatings was characterized using several analysis techniques (X-ray photoelectron spectroscopy, Fourier transform-infrared spectroscopy, ellipsometry), while the biological response of these coatings has been tested by protein adsorption and cell culture experiments. The modulation of the input plasma power controls the concentration of polyethylene oxide groups in the coatings and allows the production of films with opposite protein and cell repellent properties. The study of the stability of these coatings in different media (water, acetone, phosphate-buffered saline) reveals that these films could be involved in classical lift-off processes for the production of patterned surfaces.
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Affiliation(s)
- Frédéric Brétagnol
- Institute for Health and Consumer Protection (IHCP), Joint Research Centre, European Commission, IHCP, TP 203, I-21020 Ispra (VA), Italy.
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26
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Protein resistant surfaces: Comparison of acrylate graft polymers bearing oligo-ethylene oxide and phosphorylcholine side chains. Biointerphases 2006; 1:50. [DOI: 10.1116/1.2187495] [Citation(s) in RCA: 133] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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27
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Inoue Y, Watanabe J, Ishihara K. Dynamic motion of phosphorylcholine groups at the surface of poly(2-methacryloyloxyethyl phosphorylcholine–random–2,2,2-trifluoroethyl methacrylate). J Colloid Interface Sci 2004; 274:465-71. [PMID: 15144818 DOI: 10.1016/j.jcis.2004.02.067] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2003] [Accepted: 02/25/2004] [Indexed: 10/26/2022]
Abstract
A series of novel random copolymers composed of hydrophilic and hydrophobic monomer units have been synthesized by a conventional radical polymerization method. As the hydrophilic monomer unit, 2-methacryloyloxyethyl phosphorylcholine (MPC) was selected because the MPC polymers are well known for their excellent bio- and blood compatibilities. The semifluorinated monomer, 2,2,2-trifluoroethyl methacrylate (TFEMA), was used as the hydrophobic monomer. The surface analysis of the copolymer by X-ray photoelectron spectroscopy, dynamic contact angle measurement, and zeta-potential measurement showed that the TFEMA unit was concentrated at the outermost surface in the dry state. The dynamic reorientation of the MPC unit occurred in the wet state because the MPC unit had a strong hydrophilic character. As a result, the monomer unit composition on the surface became almost the same as that in the bulk. Nevertheless, the properties of the surface were hydrophilic in spite of the MPC unit composition of the bulk. In particular, the amount of protein adsorbed on the surface was dramatically reduced when the MPC unit mole fraction was 0.2.
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Affiliation(s)
- Yuuki Inoue
- Department of Materials Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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28
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Hyeong Kwon O, Kikuchi A, Yamato M, Okano T. Accelerated cell sheet recovery by co-grafting of PEG with PIPAAm onto porous cell culture membranes. Biomaterials 2003; 24:1223-32. [PMID: 12527263 DOI: 10.1016/s0142-9612(02)00469-6] [Citation(s) in RCA: 125] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Fabrication of functional tissue constructs from designed three-dimensional structures of cells using the layered method of cultured cell sheets could prove to be an attractive approach to tissue engineering. Rapid recovery of cell sheets is considered to be important as a basic technology for practical assembly of tissue-mimicking structures. To accelerate required culture substrate hydrophilic/hydrophobic functional changes according to the hydrated/dehydrated structural changes in response to culture temperature alteration, poly(N-isopropylacrylamide) (PIPAAm) was grafted with poly(ethylene glycol) (PEG) onto porous culture membranes by electron beam irradiation. Analyses by attenuated total reflection-Fourier transform infrared and electron spectroscopy for chemical analysis revealed that PIPAAm and PEG were successfully grafted to surfaces of porous membranes. PIPAAm-grafted porous membranes (PIPAAm-PM) were compared with porous membranes co-grafted with various amounts of PEG and PIPAAm (PIPAAm(PEG)-PM) for cell sheet detachment experiments. Approximately 35min incubation at 20 degrees C was required to completely detach cell sheets from PIPAAm-PM in a static condition, while only 19min to detach cell sheets from PIPAAm(PEG0.5%)-PM, which is co-grafted with PIPAAm and 0.5wt% of PEG. With porous membranes, water molecules were accessed by the PIPAAm molecules grafted on the surfaces from both underneath and peripheral to the attached cell sheet, resulting in more rapid hydration of grafted PIPAAm molecules and detachment of cell sheet than that for nonporous tissue culture polystyrene (TCPS) dish. With PIPAAm(PEG)-PMs, grafted PEG chains should accelerate the diffusion of water molecules to PIPAAm grafts, showing more rapid detachment of cell sheet compare to PIPAAm-PMs.
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Affiliation(s)
- Oh Hyeong Kwon
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, 8-1 Kawadacho, Shinjuku, 162-8666, Tokyo, Japan
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Shen M, Pan YV, Wagner MS, Hauch KD, Castner DG, Ratner BD, Horbett TA. Inhibition of monocyte adhesion and fibrinogen adsorption on glow discharge plasma deposited tetraethylene glycol dimethyl ether. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2002; 12:961-78. [PMID: 11787523 DOI: 10.1163/156856201753252507] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Monocytes and macrophages play important roles in host responses to implanted biomedical devices. Monocyte and macrophage interactions with biomaterial surfaces are thought to be mediated by adsorbed adhesive proteins such as fibrinogen and fibronectin. Non-fouling surfaces that minimize protein adsorption may therefore minimize monocyte adhesion, activation, and the foreign body response. Radio-frequency glow discharge plasma deposition (RF-GDPD) of tetraethylene glycol dimethyl ether (tetraglyme) was used to produce polyethylene oxide (PEO)-like coatings on a fluorinated ethylene-propylene (FEP) surface. Electron spectroscopy for chemical analysis (ESCA) and static time of flight secondary ion mass spectrometry (ToF-SIMS) were used to characterize the surface chemistry of tetraglyme coating. Fibrinogen adsorption to the tetraglyme surface was measured with 125I-labeled fibrinogen and ToF-SIMS. Adsorption of fibrinogen to plasma deposited tetraglyme was less than 10 ng cm(-2), a 20-fold decrease compared to untreated FEP or tissue culture polystyrene (TCPS). Monocyte adhesion to plasma deposited tetraglyme was significantly lower than adhesion to FEP or TCPS. In addition, when the surfaces were preadsorbed with fibrinogen, fibronectin, or blood plasma, monocyte adhesion to plasma deposited tetraglyme after 2 h or 1 day was much lower than adhesion to FEP. RF-GDPD tetraglyme coating provides a promising approach to make non-fouling biomaterials that can inhibit non-specific material-host interactions and reduce the foreign body response.
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Affiliation(s)
- M Shen
- Department of Bioengineering, University of Washington, Seattle 98195-1750, USA
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Deschamps AA, Grijpma DW, Feijen J. Poly(ethylene oxide)/poly(butylene terephthalate) segmented block copolymers: the effect of copolymer composition on physical properties and degradation behavior. POLYMER 2001. [DOI: 10.1016/s0032-3861(01)00453-0] [Citation(s) in RCA: 99] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Guo S, Shen L, Feng L. Surface characterization of blood compatible amphiphilic graft copolymers having uniform poly(ethylene oxide) side chains. POLYMER 2001. [DOI: 10.1016/s0032-3861(00)00472-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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32
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Alcantar NA, Aydil ES, Israelachvili JN. Polyethylene glycol-coated biocompatible surfaces. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2000; 51:343-51. [PMID: 10880075 DOI: 10.1002/1097-4636(20000905)51:3<343::aid-jbm7>3.0.co;2-d] [Citation(s) in RCA: 367] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Surfaces covered with polyethylene glycol (PEG; HO-(CH(2)-CH(2)-O)(n)-H) have been shown to be biocompatible because PEG's properties yield nonimmunogenicity, nonantigenicity, and protein rejection. To produce a biocompatible surface coating, we have developed a method for grafting PEG onto activated silica films. We first deposited an amorphous silica film by plasma-enhanced chemical vapor deposition from SiH(4) and O(2) gases, which provided the flexibility to coat diverse materials with different chemistries and shapes. The silica films were activated by exposure to water plasma, increasing the number of silanol groups (Si-OH) on their surface. The surface silanol groups were then chemically reacted with the hydroxyl end of PEG to form an ester bond, Si-O-C, and to cover the surface with PEG. The surface reactions were monitored using attenuated total reflection Fourier transform infrared spectroscopy. The vibrational absorption bands of the C-O and -CH(2) bonds increased with time and saturated, indicating that PEG was adsorbed to saturation coverage on the surface. Simultaneously, the Si-OH absorption band decreased, showing that the surface silanols reacted with PEG and were depleted. The PEG-covered surfaces were physically characterized by atomic force microscopy, Auger electron spectroscopy, ellipsometry, and contact angle measurements. These characterization techniques provided additional evidence for the existence of chemically bonded PEG on the surfaces. Efficacy of protein rejection on PEG-covered surfaces was studied through measurements of the fluorescence intensity of Texas red-labeled bovine serum albumin brought in contact with such surfaces in solution. Significantly less protein adsorption was observed on surfaces covered with PEG compared to uncovered surfaces.
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Affiliation(s)
- N A Alcantar
- Chemical Engineering Department and Materials Department, University of California, Santa Barbara, California 93106, USA
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33
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Uchida K, Yamato M, Ito E, Kwon OH, Kikuchi A, Sakai K, Okano T. Two different types of nonthrombogenic surfaces: PEG suppresses platelet adhesion ATP-independently but HEMA-St block copolymer requires ATP consumption of platelets to prevent adhesion. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2000; 50:585-90. [PMID: 10756317 DOI: 10.1002/(sici)1097-4636(20000615)50:4<585::aid-jbm14>3.0.co;2-b] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Poly(ethylene glycol) (PEG) and a hydrophobic-hydrophilic microdomain structured block copolymer comprising poly(2-hydroxyethyl methacrylate) and polystyrene (HEMA-St) have been reported to show good blood compatibility owing to inhibition of platelet activation. By using a computer-assisted novel technique to analyze platelet behavior on the surfaces, we found two different mechanisms to prevent platelet adhesion. Platelets were prevented from adhesion and spreading on the microdomain surface and retained cell movement for a long time. The platelet movement velocity was not significantly different between PEG-grafted surfaces and HEMA-St block copolymer-cast surfaces. However, platelet motion was qualitatively different. Platelets on HEMA-St block copolymer-cast surfaces moved with rolling, spinning, and vibrating, whereas platelet movement was limited to oscillatory vibration on PEG-grafted surfaces. When platelets were treated with NaN(3), an adenosine triphosphate (ATP) synthesis inhibitor, before contacting the surfaces, platelets movement velocity was decreased only on HEMA-St block copolymer-cast surfaces. Such an inhibitory effect was hardly observed with platelets on PEG-grafted surfaces. We propose two different mechanisms to prevent platelet adhesion onto surfaces. One is ATP-independent as observed with PEG, and the other is ATP-dependent for HEMA-St block copolymer, where platelets consume ATP to prevent adhesion.
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Affiliation(s)
- K Uchida
- Department of Applied Chemistry, Faculty of Science and Technology, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
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Uchida K, Sakai K, Ito E, Kwon OH, Kikuchi A, Yamato M, Okano T. Temperature-dependent modulation of blood platelet movement and morphology on poly(N-isopropylacrylamide)-grafted surfaces. Biomaterials 2000; 21:923-9. [PMID: 10735469 DOI: 10.1016/s0142-9612(99)00260-4] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Poly(N-isopropylacrylamide) (PIPAAm) exhibits a reversible, temperature-dependent soluble/insoluble transition at its lower critical solution temperature (LCST) of 32 degrees C in aqueous media. The temperature-responsive PIPAAm was grafted onto tissue culture polystyrene (TCPS) dish surfaces by electron beam irradiation. Blood platelet behaviors on PIPAAm-grafted surface were examined by computerized image analysis and scanning electron microscopy. Platelet behaviors on this surface were dramatically dependent upon temperature, but those on poly(ethylene glycol)(PEG)-grafted or polystyrene remained unchanged. Below the 32 degrees C (LCST), platelets on PIPAAm-grafted surfaces retained a rounded shape and an oscillating vibratory microbrownian motion for extended times, similarly to those on PEG-grafted surfaces. Above the LCST, platelets readily adhered, spread and developed characteristic pseudopodia on PIPAAm-grafted surface similarly to those on TCPS. An ATP synthesis inhibitor failed to hinder prevention of platelet adhesion onto PIPAAm-grafted surface (below the LCST) suggesting that the preventive mechanism is ATP-independent similarly to that of PEG-grafted surfaces. These results correlate platelet surface activation state with the hydration and structure of polymer surfaces, and demonstrate the ability to modulate such reactions by a small temperature change in situ.
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Affiliation(s)
- K Uchida
- Department of Applied Chemistry, Faculty of Science and Technology, Waseda University, Tokyo, Japan
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Kamath KR, Park K. Surface modification of polymeric biomaterials by albumin grafting using h-irradiation. JOURNAL OF APPLIED BIOMATERIALS : AN OFFICIAL JOURNAL OF THE SOCIETY FOR BIOMATERIALS 1999; 5:163-73. [PMID: 10147177 DOI: 10.1002/jab.770050210] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Polymeric biomaterial surfaces were modified by albumin grafting to improve their blood compatibility. Albumin molecules were functionalized by introducing double bonds using glycidyl acrylate. The functionalized albumin was covalently attached to various biomaterial surfaces such as polypropylene, polycarbonate, and poly(vinyl chloride) by h-irradiation. Surface-induced platelet adhesion and thrombus formation on the albumin-grafted surfaces was examined using computer-enhanced video microscopy and scanning electron microscopy. The amount of the grafted albumin was dependent on the h-irradiation dose and the concentration of albumin used for adsorption. The grafted albumin molecules remained on the surface even after exposure to blood for prolonged time periods. This approach was used to graft albumin to polymeric materials of an oxygenator. The albumin grafting resulted in a substantial improvement in blood compatibility as compared to control oxygenators. The covalent grafting of functionalized albumin by h-irradiation obviates the need for premodification of chemically inert polymer surfaces. It is useful for albumin grafting to various biomaterial surfaces.
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Affiliation(s)
- K R Kamath
- Purdue University, School of Pharmacy, West Lafayette, Indiana
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37
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Yoshino N, Yamauchi T, Kondo Y, Kawase T, Teranaka T. Plaque-controlling surface modifier containing fluorocarbon chain. REACT FUNCT POLYM 1998. [DOI: 10.1016/s1381-5148(97)00114-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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38
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Sofia SJ, Merrill EW. Grafting of PEO to polymer surfaces using electron beam irradiation. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1998; 40:153-63. [PMID: 9511110 DOI: 10.1002/(sici)1097-4636(199804)40:1<153::aid-jbm18>3.0.co;2-p] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A new method was developed for binding poly-(ethylene oxide) (PEO) to polymer surfaces that involves the use of electron beam irradiation in two steps. In the first, methacrylic acid was grafted and polymerized to a polymer surface, changing it from hydrophobic to hydrophilic. Exposure of this surface to aqueous PEO solutions resulted in strong hydrogen bonding of the PEO, which was covalently grafted in a second radiation step. The PEO grafts were stable; they could not be removed with extensive washing with water, soaking in basic solution, or gentle mechanical scraping. Both monolayers and multilayers of PEO were formed. The density of the monolayers were found to have little dependence on the molecular weight or concentration of the PEO solution; multilayers could be controlled by varying the viscosity of the PEO solution and the method of application. The PEO-grafted monolayers were tested for their ability to prevent protein adsorption of cytochrome-c, albumin, and fibronectin. Monolayers of star PEO were the most effective, at best showing a 60% decrease in adsorption from untreated controls. One million molecular wight linear PEO monolayers were almost as effective as star monolayers, and 35,000 g/mol linear PEO was bound too closely to the surface, owing to its small size, to have much impact in preventing protein adsorption. The reason for the continued protein adsorption was believed to be due to a close grafting of the PEO to the surface, as well as the grafted methacrylic acid chains being long enough to extend through the PEO monolayer, thus being accessible on the surface.
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Affiliation(s)
- S J Sofia
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge 02139, USA
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39
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Iwasaki Y, Mikami A, Kurita K, Yui N, Ishihara K, Nakabayashi N. Reduction of surface-induced platelet activation on phospholipid polymer. ACTA ACUST UNITED AC 1997. [DOI: 10.1002/(sici)1097-4636(19970915)36:4%3c508::aid-jbm8%3e3.0.co;2-i] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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40
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Iwasaki Y, Mikami A, Kurita K, Yui N, Ishihara K, Nakabayashi N. Reduction of surface-induced platelet activation on phospholipid polymer. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1997; 36:508-15. [PMID: 9294766 DOI: 10.1002/(sici)1097-4636(19970915)36:4<508::aid-jbm8>3.0.co;2-i] [Citation(s) in RCA: 77] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
omega-Methacryloyloxyalkyl phosphorylcholine (MA-PC) polymers which have been synthesized with attention to the surface structure of a biomembrane show excellent blood compatibility, i.e., resistance to protein adsorption and blood cell adhesion. To clarify the stability of platelets in contact with the MAPC polymer surfaces, cytoplasmic free calcium concentration ([Ca2+],) in the platelets was measured. A platelet suspension was passed through a column packed with various polymer beads after treatment with plasma, and the [Ca2+]i in the platelets eluted from the column was measured. The [Ca2+]i in contact with the MAPC polymers, i.e., poly[2-methacryloyloxyethyl phosphorylcholine-co-nbutyl methacrylate (BMA)] (PMEB) and poly(6-methacryloyloxyhexyl phosphorylcholine-co-BMA) (PMHB), was less than that in contact with poly(BMA). However, poly(10-methacryloyloxydecyl phosphorylcholine-co-BMA) (PMDB) was not effective in suppressing the increase in [Ca2+]i, and thus was at the same level as in the poly(BMA). This result indicated that platelets in contact with PMEB or PMHB were less activated compared with those in contact with PMDB and poly(BMA). Moreover, the state of the platelets adhered to these polymer surfaces, both morphologically and immunologically, was examined. Scanning electron microscopic observation of the polymer surface after contact with a platelet suspension revealed that many platelets adhered and changed their shape on the poly(BMA). The numbers of adhetent platelets were reduced on all MAPC polymer surface. The relative amount of alpha-granule membrane glycoprotein (GMP-140) which appears on the cell membrane by activation of platelets on the PMEB surfaces was less than that on poly(BMA) and poly(2-hydroxyethyl methacrylate). These results suggest that PMEB and PMHB suppressed not only platelet adhesion but also activation of the platelets in contact with these surface.
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Affiliation(s)
- Y Iwasaki
- Institute for Medical and Dental Engineering, Tokyo Medical and Dental University, Japan
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41
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Yoshino N, Teranaka T. Synthesis of silane coupling agents containing fluorocarbon chain and applications to dentistry: plaque-controlling surface modifiers. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 1997; 8:623-53. [PMID: 9241585 DOI: 10.1163/156856297x00218] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Silane coupling agents containing a fluorocarbon chain were prepared in high yields. It was found that silanes can be useful modifiers of the surfaces of glass, metals, and resin composites for dental use. The silane coupling agent CF3(CF2)9CH2CH2Si(OCH3)3 was the best modifier of these surfaces in terms of water and oil repellency. Colorants and experimental bacterial plaque detached much more easily from, and adhered less well to, surfaces modified with this silane coupling agent compared with unmodified surfaces. The surfaces of four teeth of a denture were modified with this silane coupling agent by spreading the agent on the surfaces with a small brush followed by brief drying with a hair drier. The modified tooth surfaces of the denture, which was worn for four months in a heavy smoker's oral cavity, were more stain-resistant than the unmodified tooth surfaces. It is expected that silane coupling agents containing a fluorocarbon chain will be surface modifiers for enhancement of oral health.
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Affiliation(s)
- N Yoshino
- Department of Industrial Chemistry, Faculty of Engineering, Science University of Tokyo, Japan
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42
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Iwasaki Y, Fujiike A, Kurita K, Ishihara K, Nakabayashi N. Protein adsorption and platelet adhesion on polymer surfaces having phospholipid polar group connected with oxyethylene chain. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 1997; 8:91-102. [PMID: 8957706 DOI: 10.1163/156856296x00174] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We evaluated the blood compatibility of various amphiphilic polymers, that is, n-butyl methacrylate (BMA) copolymers with methacrylates having a phosphorylcholine (PC), hydroxy (OH) or methoxy (MeO) group as an end polar group in the oxyethylene side chain. The amount of proteins adsorbed on the PC-polymer from human plasma was smaller than that on not only the poly(2-hydroxyethyl methacrylate) and poly(methyl methacrylate) but also the OH-polymer and MeO-polymer. The PC group could weaken the interaction between plasma proteins and polymer surfaces. The amount of adsorbed proteins on the PC-polymer decreased with an increase in the mole fraction of the PC units in the polymers. We could observe an effect of the oxyethylene chain length (n is the number of repeating units of oxyethylene) on protein adsorption between n = 2 and n = 3. The platelet adhesion on these polymer surfaces was evaluated using rabbit platelet-rich plasma. On the polymers without the PC group, that is, poly(BMA), OH-polymer, and MeO-polymer, many platelets adhered and a considerable shape change in the adherent platelets occurred. On the other hand, the PC-polymers could effectively suppress platelet adhesion. The platelet adhesion behavior on the polymers was strongly dependent on the adsorbed proteins. Platelet adhesion was completely inhibited on all of the PC-polymers studied having a 0.3 PC unit mole fraction. However, it was observed that the oxyethylene chains on the PC-polymers with a 0.1 PC unit mole fraction affected platelet adhesion.
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Affiliation(s)
- Y Iwasaki
- Institute for Medical and Dental Engineering, Tokyo Medical and Dental University, Japan
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43
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Lan PN, Corneillie S, Schacht E, Davies M, Shard A. Synthesis and characterization of segmented polyurethanes based on amphiphilic polyether diols. Biomaterials 1996; 17:2273-80. [PMID: 8968523 DOI: 10.1016/0142-9612(96)00056-7] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Segmented polyurethanes (SPUs) based on polyethylene glycol (PEG), polypropylene glycol (PPG) and a series of Pluronics with different ethylene oxide/propylene oxide ratios (EO/PO) and molecular weights were prepared. Different diisocyanates were used for making SPUs: 4,4-diphenylmethane diisocyanate (MDI), 4,4-dicyclohexylmethane diisocyanate (MDCI), hexamethylene diisocyanate (HMDI) and isophorone diisocyanate (IPDI). 1,4-Butane diol (BD) and ethylene diamine (ED) were used as chain extenders. The polymers obtained were characterized by infrared spectroscopy (IR), nuclear magnetic resonance (NMR) and differential scanning calorimetry (DSC). The microphase morphology (phase separation and phase mixing) is discussed in more detail.
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Affiliation(s)
- P N Lan
- University of Gent, Department of Organic Chemistry, Belgium
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44
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Hsiue GH, Lee SD, Chang PC. Surface modification of silicone rubber membrane by plasma induced graft copolymerization as artificial cornea. Artif Organs 1996; 20:1196-207. [PMID: 8908330 DOI: 10.1111/j.1525-1594.1996.tb00661.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
In this study a highly biocompatible polymer membrane was prepared by surface modification. An artificial cornea was also developed for clinical applications. Silicone rubber (SR) membrane was grafted with hydrophilic monomers such as 2-hydroxyethyl methacrylate (HEMA) and acrylic acid by plasma induced grafted polymerization. Surface properties of the SR were characterized using secondary ions mass spectra, Fourier transform infrared/attenuated total reflection, and element spectra for chemical analysis. The corneal epithelial (CE) cell was cultured in vitro, and penetrating keratoplasty of albino rabbit cornea (in vivo) was performed to evaluate biological properties of modified SR membranes. The ability of the CE cell to attach onto various SR membranes was observed by inverted microscopy. The proliferation of CE cell was conducted in approximately 96 h. Experimental results indicated that the attachment and growth of CE onto SR-g-pHEMA (75 micrograms/ cm2) is enhanced. The morphologies of an attached CE cell are similar to those of a primary CE cell. In the in vivo study, the depth of anterior chamber was maintained 2 weeks after penetrating keratoplasty was performed with a SR grafted with pHEMA (210 micrograms/cm2). This phenomenon displayed a high biocompatibility of modified SR membrane with the CE cell. Furthermore, results in this study provide a valuable reference for application of the modified SR for an artificial cornea.
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Affiliation(s)
- G H Hsiue
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
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45
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Matsuda T, Sugawara T. Control of cell adhesion, migration, and orientation on photochemically microprocessed surfaces. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1996; 32:165-73. [PMID: 8884491 DOI: 10.1002/(sici)1097-4636(199610)32:2<165::aid-jbm3>3.0.co;2-r] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Using surface-photochemistry-driven microprocessing, striped patterns of cell-adhesive and nonadhesive domains were prepared on tissue-culture dishes. The width of striped patterns ranged from 20 to 130 microns. When endothelial cells were cultured on such dimensionally well-defined surfaces, cells adhered, migrated, and proliferated only on cell-adhesive domains. Migration potentials such as tracks of moving cells and migration rates were determined using a time-lapse video recording apparatus under a phase-contrast microscope and a computer-assisted image analyzer. The migration track in the direction of the width of the stripe-pattern was limited to the size of the width, and effective migratory distance over 400 min of observation was considerably reduced, to almost half that for a nontreated surface, whereas migratory rate was not changed by surface processing, irrespective of the stripe-pattern width. After a 2-day culture, oriented patterned cellular sheets were obtained. Cells were elongated and aligned along the axis of the striped pattern. The degrees of orientation and elongation were enhanced with a decrease of the line width. At the narrowest surface domain, cells only migrated back and forth, and eventually they became highly elongated and oriented along the axis of the domain. These results indicated that the adhesion area, migrating direction, and orientation of cells can be controlled by this method with micron-order precision. This method provides quantitative information on the kinetics of the migration process and the morphogenesis of the microprocessed surface.
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Affiliation(s)
- T Matsuda
- Department of Bioengineering, National Cardiovascular Center Research Institute, Osaka, Japan
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46
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Matsuda T, Sugawara T. Synthesis of Multifunctional, Nonionic Vinyl Polymers and Their 13C Spin-Lattice Relaxation Times in Deuterium Oxide Solutions. Macromolecules 1996. [DOI: 10.1021/ma9510653] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takehisa Matsuda
- Department of Bioengineering, National Cardiovascular Center Research Institute, 5-7-1 Fujishirodai, Suita, Osaka 565, Japan
| | - Takashi Sugawara
- Department of Bioengineering, National Cardiovascular Center Research Institute, 5-7-1 Fujishirodai, Suita, Osaka 565, Japan
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47
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Kamath KR, Danilich MJ, Marchant RE, Park K. Platelet interactions with plasma-polymerized ethylene oxide and N-vinyl-2-pyrrolidone films and linear poly(ethylene oxide) layer. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 1996; 7:977-88. [PMID: 8858486 DOI: 10.1163/156856296x00381] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Dimethyldichlorosilane (DDS)-treated glass (DDS-glass) was modified with either poly(ethylene oxide) (PEO) films or poly(N-vinyl-2-pyrrolidone) (PNVP) films by plasma polymerization. The thickness of the plasma polymerized films was varied between 40 and 700 nm. The results showed that the hydrophilic plasma polymerized PEO and PNVP films on DDS-glass did not prevent platelet adhesion and activation. The film thickness had only marginal influence on the prevention of platelet activation. In contrast, platelet adhesion was prevented on DDS-glass absorbed with a PEO-containing block copolymer (Pluronic F-108 surfactant) even at a calculated thickness of the PEO layer of less than 40 nm. This study shows that surface hydrophilization is not sufficient for prevention of platelet adhesion and activation. The contrasting results in platelet adhesion between cross-linked plasma polymers and linear PEO-containing block copolymers may be explained qualitatively by a steric repulsion mechanism that is achieved by the conformational freedom of the linear PEO chains interacting with water.
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Affiliation(s)
- K R Kamath
- Purdue University, School of Pharmacy, West Lafayette, IN 47907, USA
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48
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Hsiue GH, Lee SD, Chang PC. Platelet adhesion and cellular interaction with poly(ethylene oxide) immobilized onto silicone rubber membrane surfaces. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 1996; 7:839-55. [PMID: 8836831 DOI: 10.1163/156856296x00020] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Cellular interaction and platelet adsorption were investigated on poly(ethylene oxide) (PEO) immobilized silicone rubber membrane (SR) which has polyacrylic acid grafts on the surfaces. Polyacrylic acid (PAA) had been introduced to the SR surface after Ar plasma treatment of SR surfaces to introduce peroxide groups. Surface characterizations were made using ATR-FTIR, ESCA, SEM, and contact angle measurements. Experimental results obtained by ESCA high resolution curve fitting spectra indicated that the amount of bisamino PEO of different molecular weights immobilized onto SR surfaces were similar, which showed that the influence of the length of molecular chains (-C-C-O-) on the reactivity of terminal amino group is negligible. The wettability of modified SR surfaces increased with an increase in PEO molecular weight. Biological studies such as corneal epithelial cell culture and blood platelet adhesion were performed to understand the biocompatibility of modified SR surfaces. Biological studies using corneal epithelial cells showed that cell migration, attachment and proliferation onto PEO-20000 immobilized SR surface were suppressed, whereas these biological activities on PEO-600 were enhanced. Another study on platelet adhesion revealed that many platelets attached to PEO-600 immobilized SR, while platelet deposition was rarely observed on SR grafted with PEO-3350. The effects of different PEO molecular chains on biological response were discussed.
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Affiliation(s)
- G H Hsiue
- Department of Chemical Engineering National Tsing Hua University, Hsinchu, Taiwan, ROC
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49
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Matsuda T, Sugawara T. Development of surface photochemical modification method for micropatterning of cultured cells. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1995; 29:749-56. [PMID: 7593012 DOI: 10.1002/jbm.820290611] [Citation(s) in RCA: 102] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
This article reports the development of micropatterning technology of cultured cells by precise surface regional modification via photochemical fixation of phenyl azido-derivatized polymers on polymer surfaces. Photoreactive polymers prepared in this study included poly(N,N-dimethylacrylamide-co-3-azidostyrene), bis-4-azidobenzamide-polyethylene glycol, and poly(styrene-co-3-azidostyrene). The photochemical fixation of these photoreactive polymers consisted of three steps: 1) coating of a photoreactive polymer on a material surface, 2) ultraviolet irradiation through a photomask, and 3) removal of nonreacted polymer by a solvent. Electron spectroscopy for chemical analysis and water contact angle measurement were employed for surface characterization. Two different types of regionally modified surfaces were prepared; one was a hydrophilic polymer regionally fixed on a tissue culture dish and the other was a hydrophobic polymer regionally fixed on poly(vinyl alcohol) (PVA). Photochemical surface microfabrication permits mu-order dimensional precision, which was verified by the micropatterned tissue formation of bovine aorta endothelial cells (ECs) when ECs were seeded on these surfaces. ECs adhered, spread, and confluently proliferated only on uncoated tissue culture dish surfaces or hydrophobic regions on PVA. Thus, the regionally differentiated cell adhesional regions were created by photochemically driven surface microprocessing.
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Affiliation(s)
- T Matsuda
- Department of Bioengineering, National Cardiovascular Center Research Institute, Osaka, Japan
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50
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Harper GR, Davis SS, Davies MC, Norman ME, Tadros TF, Taylor DC, Irving MP, Waters JA, Watts JF. Influence of surface coverage with poly(ethylene oxide) on attachment of sterically stabilized microspheres to rat Kupffer cells in vitro. Biomaterials 1995; 16:427-39. [PMID: 7654869 DOI: 10.1016/0142-9612(95)98815-v] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The attachment to rat Kupffer cells of polymeric microspheres, sterically stabilized with different amounts of pendant poly(ethylene oxide) (PEO), was assessed in vitro. Four types of copolymer polystyrene (PS) microspheres were synthesized by variation of four possible monomer ratios that included styrene, methoxy-PEO-methacrylate (750 and 2000 mol. wt PEO) and allylurea. This produced poly(styrene-(methoxy-PEO)methacrylate) microspheres with hydrophilic side-groups of either urea (PS-U-PEO) and/or mixed molecular weight (750/2000 mol. wt) PEO (PS-U-M-PEO, PS-M-PEO), or single molecular weight (2000) PEO (PS-PEO) at their surfaces. The hypothesis was tested that increasing the total content of PEO comprising the steric barrier reduces attachment to cell surfaces. Attachment of PEO microspheres bearing the urea spacer and/or mixed molecular weight PEO was found to be intermediate between charge stabilized control PS and PEO (2000 mol. wt) bearing particles. Post-adsorption of different Poloxamer (PEO-poly(propylene oxide)-PEO) surfactants to the microspheres further decreased attachment. Significant negative linear correlations between surface PEO content, measured by electron spectroscopy for chemical analysis (ESCA), and attachment to Kupffer cells were demonstrated. Decreases in attachment also resulted with all graft PEO particles bearing adsorbed sodium dodecyl sulphate (SDS), whilst the attachment of SDS-treated PS control particles increased. It is proposed that trains of adsorbed graft PEO are displaced by the SDS to increase the effective fraction of graft PEO within the steric layer. Overall, increasing the amount of hydrophilic PEO in the steric layer, from graft and adsorbed sources, reduces the attachment of these particles to Kupffer cells in vitro.
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Affiliation(s)
- G R Harper
- Department of Pharmaceutical Sciences, Nottingham University, UK
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