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Song J, Zhang Q, Li G, Zhang Y. Constructing ECM-like Structure on the Plasma Membrane via Peptide Assembly to Regulate the Cellular Response. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:8733-8747. [PMID: 35839338 DOI: 10.1021/acs.langmuir.2c00711] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
This feature article introduces the design of self-assembling peptides that serve as the basic building blocks for the construction of extracellular matrix (ECM)-like structure in the vicinity of the plasma membrane. By covalently conjugating a bioactive motif, such as membrane protein binding ligand or enzymatic responsive building block, with a self-assembling motif, especially the aromatic peptide, a self-assembling peptide that retains bioactivity is obtained. Instructed by the target membrane protein or enzyme, the bioactive peptides self-assemble into ECM-like structure exerting various stimuli to regulate the cellular response via intracellular signaling, especially mechanotransduction. By briefly summarizing the properties and applications (e.g., wound healing, controlling cell motility and cell fate) of these peptides, we intend to illustrate the basic requirements and promises of the peptide assembly as a true bottom-up approach in the construction of artificial ECM.
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Affiliation(s)
- Jiaqi Song
- Department of Biophysics, School of Basic Medical Sciences, Health Science Centre, Xi'an Jiaotong University, Shaanxi 710061, P. R. China
| | - Qizheng Zhang
- Active Soft Matter Group, CAS Songshan Lake Materials Laboratory, Dongguan 523808, China
- Department of Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR
| | - Guanying Li
- Department of Biophysics, School of Basic Medical Sciences, Health Science Centre, Xi'an Jiaotong University, Shaanxi 710061, P. R. China
| | - Ye Zhang
- Active Soft Matter Group, CAS Songshan Lake Materials Laboratory, Dongguan 523808, China
- Bioinspired Soft Matter Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa 904-0495, Japan
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2
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Mierke CT. Viscoelasticity, Like Forces, Plays a Role in Mechanotransduction. Front Cell Dev Biol 2022; 10:789841. [PMID: 35223831 PMCID: PMC8864183 DOI: 10.3389/fcell.2022.789841] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 01/11/2022] [Indexed: 12/13/2022] Open
Abstract
Viscoelasticity and its alteration in time and space has turned out to act as a key element in fundamental biological processes in living systems, such as morphogenesis and motility. Based on experimental and theoretical findings it can be proposed that viscoelasticity of cells, spheroids and tissues seems to be a collective characteristic that demands macromolecular, intracellular component and intercellular interactions. A major challenge is to couple the alterations in the macroscopic structural or material characteristics of cells, spheroids and tissues, such as cell and tissue phase transitions, to the microscopic interferences of their elements. Therefore, the biophysical technologies need to be improved, advanced and connected to classical biological assays. In this review, the viscoelastic nature of cytoskeletal, extracellular and cellular networks is presented and discussed. Viscoelasticity is conceptualized as a major contributor to cell migration and invasion and it is discussed whether it can serve as a biomarker for the cells' migratory capacity in several biological contexts. It can be hypothesized that the statistical mechanics of intra- and extracellular networks may be applied in the future as a powerful tool to explore quantitatively the biomechanical foundation of viscoelasticity over a broad range of time and length scales. Finally, the importance of the cellular viscoelasticity is illustrated in identifying and characterizing multiple disorders, such as cancer, tissue injuries, acute or chronic inflammations or fibrotic diseases.
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Affiliation(s)
- Claudia Tanja Mierke
- Faculty of Physics and Earth Science, Peter Debye Institute of Soft Matter Physics, Biological Physics Division, University of Leipzig, Leipzig, Germany
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3
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Improving the biofouling resistance of polyamide thin-film composite membrane via grafting polyacrylamide brush on the surface by in-situ atomic transfer radical polymerization. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2021.119283] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Kim KH, Kim M, Moon J, Huh J, Bang J. Bottlebrush Copolymer as Surface Neutralizer for Vertical Alignment of Block Copolymer Nanodomains in Thin Films. ACS Macro Lett 2021; 10:346-353. [PMID: 35549064 DOI: 10.1021/acsmacrolett.0c00879] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Herein we designed bottlebrush copolymers for use as a neutral additive to block copolymer (BCP) thin films in which they are segregated to the interfaces via architectural effects and produce nonpreferential interfaces to induce perpendicular orientation of BCP microdomains. Two BCP systems were employed, a conventional poly(styrene-b-methyl methacrylate) (PS-b-PMMA) with relatively low χ and similar surface energies between blocks, and a high χ poly(styrene-b-methacrylic acid) (PS-b-PMAA) with distinct surface energies. The bottlebrushes, with either short side-chains of PS-r-PMMA or PS-r-PMAA random copolymers, were synthesized via ring-opening metathesis polymerization (ROMP). Remarkably, it was observed that the top and bottom interfaces of both BCP films were enriched with bottlebrush copolymers, regardless of the surface energy difference between blocks, hence, vertically oriented microdomains were achieved for both BCP systems. This can be attributed to the screening of polymer interactions by a good solvent during the spin-casting process, allowing architectural effects to play a role in surface segregation of bottlebrush copolymers, as confirmed by contact angle measurements and time-of-flight secondary ion mass spectroscopy (TOF-SIMS). We believe that this concept can be further extended to various applications that require polymer films with functional surfaces.
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Affiliation(s)
- Ki Hyun Kim
- Department of Chemical and Biological Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Mincheol Kim
- Department of Chemical and Biological Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Junsoo Moon
- Department of Chemical and Biological Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - June Huh
- Department of Chemical and Biological Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Joona Bang
- Department of Chemical and Biological Engineering, Korea University, Seoul, 02841, Republic of Korea
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5
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Miyagi K, Mei H, Terlier T, Stein GE, Verduzco R. Analysis of Surface Segregation of Bottlebrush Polymer Additives in Thin Film Blends with Attractive Intermolecular Interactions. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00744] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Kazuma Miyagi
- Department of Applied Life Science, Faculty of Applied Biological Sciences, Gifu University, Gifu 501-1193, Japan
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, Texas 77005, United States
| | - Hao Mei
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, Texas 77005, United States
| | - Tanguy Terlier
- SIMS Lab, Shared Equipment Authority, Rice University, Houston, Texas 77005, United States
| | - Gila E. Stein
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Rafael Verduzco
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, Texas 77005, United States
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
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6
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Zhang H, Liu S, Zhang C, Fan J, Lin L, Wang C, Song Y. The mechanism of the excited-state proton transfer of Salicylaldehyde azine and 2,2'-[1,4-Phenylenebis{(E)- nitrilomethylidyne}] bisphenol: Via single or double proton transfer. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 223:117321. [PMID: 31277029 DOI: 10.1016/j.saa.2019.117321] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 06/25/2019] [Accepted: 06/25/2019] [Indexed: 06/09/2023]
Abstract
The Salicylaldehyde azine (H2SA) and 2,2'-[1,4-Phenylenebis{(E)-nitrilomethylidyne}] bisphenol (H2SPA) with double proton transfer characteristics were synthesized recently (Phys. Chem. Chem. Phys., 2018, 20, 23,762). However, the detailed theoretical interpretation of proton transfer (PT) mechanism is inadequate. In the present work, density functional theory (DFT) and time-density functional theory (TDDFT) are employed to study the proton transfer mechanism of H2SA and H2SPA in detail. Bond parameters, infrared (IR) spectra and frontier molecular orbitals (FMOs) calculated by PBE0/TZVP method indicate the strength of hydrogen bond is enhanced in S1 state, which can be visualized by the reduced density gradient (RDG) analysis. The potential energy surfaces (PESs) of H2SA and H2SPA are also constructed. The small barriers indicate that both the single proton transfer and double proton transfer of H2SA and H2SPA are more likely to occur in the S1 state. In addition, the properties of H2SA and H2SPA after chelation with Li+ have also been theoretically characterized. According to the calculated fluorescence spectra of compounds (H2SA-Li+ and H2SPA-Li+), it was found that only the planar structure of H2SA-Li+ can form metallogel, which verified the experimental results.
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Affiliation(s)
- Hui Zhang
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Songsong Liu
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Changzhe Zhang
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Jianzhong Fan
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Lili Lin
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Chuankui Wang
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Yuzhi Song
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China.
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Mei H, Laws TS, Mahalik JP, Li J, Mah AH, Terlier T, Bonnesen P, Uhrig D, Kumar R, Stein GE, Verduzco R. Entropy and Enthalpy Mediated Segregation of Bottlebrush Copolymers to Interfaces. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01801] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
| | | | - Jyoti P. Mahalik
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States
| | | | - Adeline H. Mah
- Materials Science and Engineering Program, University of Houston, Houston, Texas 77204, United States
| | | | - Peter Bonnesen
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States
| | - David Uhrig
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States
| | - Rajeev Kumar
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States
- Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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8
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Zhou S, Hokugo A, McClendon M, Zhang Z, Bakshi R, Wang L, Segovia LA, Rezzadeh K, Stupp SI, Jarrahy R. Bioactive peptide amphiphile nanofiber gels enhance burn wound healing. Burns 2019; 45:1112-1121. [DOI: 10.1016/j.burns.2018.06.008] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 06/08/2018] [Accepted: 06/16/2018] [Indexed: 12/18/2022]
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9
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Affiliation(s)
- Gila E. Stein
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Travis S. Laws
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
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10
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Santoro R, Perrucci GL, Gowran A, Pompilio G. Unchain My Heart: Integrins at the Basis of iPSC Cardiomyocyte Differentiation. Stem Cells Int 2019; 2019:8203950. [PMID: 30906328 PMCID: PMC6393933 DOI: 10.1155/2019/8203950] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 12/20/2018] [Accepted: 01/10/2019] [Indexed: 02/06/2023] Open
Abstract
The cellular response to the extracellular matrix (ECM) microenvironment mediated by integrin adhesion is of fundamental importance, in both developmental and pathological processes. In particular, mechanotransduction is of growing importance in groundbreaking cellular models such as induced pluripotent stem cells (iPSC), since this process may strongly influence cell fate and, thus, augment the precision of differentiation into specific cell types, e.g., cardiomyocytes. The decryption of the cellular machinery starting from ECM sensing to iPSC differentiation calls for new in vitro methods. Conveniently, engineered biomaterials activating controlled integrin-mediated responses through chemical, physical, and geometrical designs are key to resolving this issue and could foster clinical translation of optimized iPSC-based technology. This review introduces the main integrin-dependent mechanisms and signalling pathways involved in mechanotransduction. Special consideration is given to the integrin-iPSC linkage signalling chain in the cardiovascular field, focusing on biomaterial-based in vitro models to evaluate the relevance of this process in iPSC differentiation into cardiomyocytes.
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Affiliation(s)
- Rosaria Santoro
- Unità di Biologia Vascolare e Medicina Rigenerativa, Centro Cardiologico Monzino IRCCS, via Carlo Parea 4, Milan, Italy
| | - Gianluca Lorenzo Perrucci
- Unità di Biologia Vascolare e Medicina Rigenerativa, Centro Cardiologico Monzino IRCCS, via Carlo Parea 4, Milan, Italy
| | - Aoife Gowran
- Unità di Biologia Vascolare e Medicina Rigenerativa, Centro Cardiologico Monzino IRCCS, via Carlo Parea 4, Milan, Italy
| | - Giulio Pompilio
- Unità di Biologia Vascolare e Medicina Rigenerativa, Centro Cardiologico Monzino IRCCS, via Carlo Parea 4, Milan, Italy
- Dipartimento di Scienze Cliniche e di Comunità, Università degli Studi di Milano, via Festa del Perdono 7, Milan, Italy
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11
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Guskova O, Savchenko V, König U, Uhlmann P, Sommer JU. How do immobilised cell-adhesive Arg–Gly–Asp-containing peptides behave at the PAA brush surface? MOLECULAR SIMULATION 2018. [DOI: 10.1080/08927022.2018.1502429] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Olga Guskova
- Leibniz Institut für Polymerforschung Dresden e.V., Dresden, Germany
- Dresden Center for Computational Materials Science, Technische Universität Dresden, Dresden, Germany
| | - Vladyslav Savchenko
- Fakultät Umweltwissenschaften, Technische Universität Dresden, Dresden, Germany
| | - Ulla König
- Leibniz Institut für Polymerforschung Dresden e.V., Dresden, Germany
| | - Petra Uhlmann
- Leibniz Institut für Polymerforschung Dresden e.V., Dresden, Germany
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Jens-Uwe Sommer
- Leibniz Institut für Polymerforschung Dresden e.V., Dresden, Germany
- Dresden Center for Computational Materials Science, Technische Universität Dresden, Dresden, Germany
- Institut für Theoretische Physik, Technische Universität Dresden, Dresden, Germany
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12
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Karimi F, O'Connor AJ, Qiao GG, Heath DE. Integrin Clustering Matters: A Review of Biomaterials Functionalized with Multivalent Integrin-Binding Ligands to Improve Cell Adhesion, Migration, Differentiation, Angiogenesis, and Biomedical Device Integration. Adv Healthc Mater 2018; 7:e1701324. [PMID: 29577678 DOI: 10.1002/adhm.201701324] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 01/24/2018] [Indexed: 01/17/2023]
Abstract
Material systems that exhibit tailored interactions with cells are a cornerstone of biomaterial and tissue engineering technologies. One method of achieving these tailored interactions is to biofunctionalize materials with peptide ligands that bind integrin receptors present on the cell surface. However, cell biology research has illustrated that both integrin binding and integrin clustering are required to achieve a full adhesion response. This biophysical knowledge has motivated researchers to develop material systems biofunctionalized with nanoscale clusters of ligands that promote both integrin occupancy and clustering of the receptors. These materials have improved a wide variety of biological interactions in vitro including cell adhesion, proliferation, migration speed, gene expression, and stem cell differentiation; and improved in vivo outcomes including increased angiogenesis, tissue healing, and biomedical device integration. This review first introduces the techniques that enable the fabrication of these nanopatterned materials, describes the improved biological effects that have been achieved, and lastly discusses the current limitations of the technology and where future advances may occur. Although this technology is still in its nascency, it will undoubtedly play an important role in the future development of biomaterials and tissue engineering scaffolds for both in vitro and in vivo applications.
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Affiliation(s)
- Fatemeh Karimi
- School of Chemical and Biomedical Engineering; Particulate Fluids Processing Centre; University of Melbourne; Parkville VIC 3010 Australia
- Polymer Science Group; Department of Chemical Engineering; Particulate Fluid Processing Centre; University of Melbourne; Parkville VIC 3010 Australia
| | - Andrea J. O'Connor
- School of Chemical and Biomedical Engineering; Particulate Fluids Processing Centre; University of Melbourne; Parkville VIC 3010 Australia
| | - Greg G. Qiao
- Polymer Science Group; Department of Chemical Engineering; Particulate Fluid Processing Centre; University of Melbourne; Parkville VIC 3010 Australia
| | - Daniel E. Heath
- School of Chemical and Biomedical Engineering; Particulate Fluids Processing Centre; University of Melbourne; Parkville VIC 3010 Australia
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13
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Yang Z, Saeki D, Matsuyama H. Zwitterionic polymer modification of polyamide reverse-osmosis membranes via surface amination and atom transfer radical polymerization for anti-biofouling. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2018.01.001] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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14
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Zhang R, Liu Y, He M, Su Y, Zhao X, Elimelech M, Jiang Z. Antifouling membranes for sustainable water purification: strategies and mechanisms. Chem Soc Rev 2018; 45:5888-5924. [PMID: 27494001 DOI: 10.1039/c5cs00579e] [Citation(s) in RCA: 602] [Impact Index Per Article: 100.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
One of the greatest challenges to the sustainability of modern society is an inadequate supply of clean water. Due to its energy-saving and cost-effective features, membrane technology has become an indispensable platform technology for water purification, including seawater and brackish water desalination as well as municipal or industrial wastewater treatment. However, membrane fouling, which arises from the nonspecific interaction between membrane surface and foulants, significantly impedes the efficient application of membrane technology. Preparing antifouling membranes is a fundamental strategy to deal with pervasive fouling problems from a variety of foulants. In recent years, major advancements have been made in membrane preparation techniques and in elucidating the antifouling mechanisms of membrane processes, including ultrafiltration, nanofiltration, reverse osmosis and forward osmosis. This review will first introduce the major foulants and the principal mechanisms of membrane fouling, and then highlight the development, current status and future prospects of antifouling membranes, including antifouling strategies, preparation techniques and practical applications. In particular, the strategies and mechanisms for antifouling membranes, including passive fouling resistance and fouling release, active off-surface and on-surface strategies, will be proposed and discussed extensively.
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Affiliation(s)
- Runnan Zhang
- Key Laboratory for Green Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China. and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Yanan Liu
- Key Laboratory for Green Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China. and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Mingrui He
- Key Laboratory for Green Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China. and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Yanlei Su
- Key Laboratory for Green Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China. and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Xueting Zhao
- Key Laboratory for Green Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China. and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Menachem Elimelech
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520-8286, USA
| | - Zhongyi Jiang
- Key Laboratory for Green Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China. and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
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15
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Iturri J, Toca-Herrera JL. Characterization of Cell Scaffolds by Atomic Force Microscopy. Polymers (Basel) 2017; 9:E383. [PMID: 30971057 PMCID: PMC6418519 DOI: 10.3390/polym9080383] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2017] [Revised: 08/13/2017] [Accepted: 08/16/2017] [Indexed: 12/12/2022] Open
Abstract
This review reports on the use of the atomic force microscopy (AFM) in the investigation of cell scaffolds in recent years. It is shown how the technique is able to deliver information about the scaffold surface properties (e.g., topography), as well as about its mechanical behavior (Young's modulus, viscosity, and adhesion). In addition, this short review also points out the utilization of the atomic force microscope technique beyond its usual employment in order to investigate another type of basic questions related to materials physics, chemistry, and biology. The final section discusses in detail the novel uses that those alternative measuring modes can bring to this field in the future.
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Affiliation(s)
- Jagoba Iturri
- Institute for Biophysics, Department of NanoBiotechnology, University of Natural Resources and Life Sciences, Muthgasse 11, 1190 Wien, Austria.
| | - José L Toca-Herrera
- Institute for Biophysics, Department of NanoBiotechnology, University of Natural Resources and Life Sciences, Muthgasse 11, 1190 Wien, Austria.
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16
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Modification of electrospun poly(L-lactic acid)/polyethylenimine nanofibrous scaffolds for biomedical application. INT J POLYM MATER PO 2017. [DOI: 10.1080/00914037.2017.1320661] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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17
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Kaner P, Hu X, Thomas SW, Asatekin A. Self-Cleaning Membranes from Comb-Shaped Copolymers with Photoresponsive Side Groups. ACS APPLIED MATERIALS & INTERFACES 2017; 9:13619-13631. [PMID: 28345857 DOI: 10.1021/acsami.7b01585] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In this study, we present a novel self-cleaning, photoresponsive membrane that is capable of removing predeposited foulant layers upon changes in surface morphology in response to UV or visible light irradiation while maintaining stable pore size and water permeance. These membranes were prepared by creating thin film composite (TFC) membranes by coating a porous support membrane with a thin layer of novel comb-shaped graft copolymers at two side-chain lengths featuring polyacrylonitrile (PAN) backbones and photoreactive side chains, synthesized by atom transfer radical polymerization (ATRP). Photoregulated control over membrane properties is attained through a light-induced transition, where the side chains switch between a hydrophobic spiropyran (SP) state and a zwitterionic, hydrophilic merocyanine (MC) state. The light-induced switch between the SP and MC forms changes surface hydrophilicity and causes morphological changes on the membrane surface as evidenced by atomic force microscopy (AFM). Before any phototreatment, the as-coated membrane surface comprises mostly hydrophobic SP groups that allow the adsorption of organic solutes such as proteins the membrane surface, reducing flow rate. Once exposed to UV light, conversion of the SP groups to hydrophilic MC groups leads to the release of adsorbed molecules and the full recovery of the initial water flux. A fouled membrane in the more hydrophilic MC form is also capable of self-cleaning upon conversion to the less hydrophilic SP form by visible light irradiation. The self-cleaning behavior observed for this system, where the surface became less hydrophilic but also experienced a morphological change, demonstrates a novel mechanism that has a mechanical component in addition to the changes in hydrophilicity. It is also the first report, to our knowledge, of self-cleaning performance accompanied by a decrease in hydrophilicity.
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Affiliation(s)
- Papatya Kaner
- Department of Chemical and Biological Engineering, Tufts University , Medford, Massachusetts 02155, United States
| | - Xiaoran Hu
- Department of Chemistry, Tufts University , Medford, Massachusetts 02155, United States
| | - Samuel W Thomas
- Department of Chemistry, Tufts University , Medford, Massachusetts 02155, United States
| | - Ayse Asatekin
- Department of Chemical and Biological Engineering, Tufts University , Medford, Massachusetts 02155, United States
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18
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Karimi F, McKenzie TG, O'Connor AJ, Qiao GG, Heath DE. Nano-scale clustering of integrin-binding ligands regulates endothelial cell adhesion, migration, and endothelialization rate: novel materials for small diameter vascular graft applications. J Mater Chem B 2017; 5:5942-5953. [DOI: 10.1039/c7tb01298e] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Blood contacting devices are commonly used in today's medical landscape.
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Affiliation(s)
- Fatemeh Karimi
- School of Chemical and Biomedical Engineering
- Particulate Fluids Processing Centre
- University of Melbourne
- Melbourne
- Australia
| | - Thomas G. McKenzie
- Polymer Science Group
- Department of Chemical Engineering
- Particulate Fluids Processing Centre
- University of Melbourne
- Melbourne
| | - Andrea J. O'Connor
- School of Chemical and Biomedical Engineering
- Particulate Fluids Processing Centre
- University of Melbourne
- Melbourne
- Australia
| | - Greg G. Qiao
- Polymer Science Group
- Department of Chemical Engineering
- Particulate Fluids Processing Centre
- University of Melbourne
- Melbourne
| | - Daniel E. Heath
- School of Chemical and Biomedical Engineering
- Particulate Fluids Processing Centre
- University of Melbourne
- Melbourne
- Australia
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Korzhikov-Vlakh V, Krylova M, Sinitsyna E, Ivankova E, Averianov I, Tennikova TB. Hydrogel Layers on the Surface of Polyester-Based Materials for Improvement of Their Biointeractions and Controlled Release of Proteins. Polymers (Basel) 2016; 8:E418. [PMID: 30974696 PMCID: PMC6432385 DOI: 10.3390/polym8120418] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 11/24/2016] [Accepted: 11/28/2016] [Indexed: 12/24/2022] Open
Abstract
The modification of bioresorbable polyester surfaces in order to alter their biointeractions presents an important problem in biomedical polymer science. In this study, the covalent modification of the surface of poly(lactic acid)-based (PLA-based) films with poly(acryl amide) and sodium alginate hydrogels was performed to change the non-specific polyester interaction with proteins and cells, as well as to make possible the covalent attachment of low-molecular weight ligands and to control protein release. The effect of such modification on the film surface properties was studied. Parameters such as swelling, water contact angle, surface area, and binding capacity of low-molecular weight substances were evaluated and compared. The comparative study of adsorption of model protein (BSA) on the surface of non-modified and modified films was investigated and the protein release was evaluated. Cell viability on the surface of hydrogel-coated films was also tested. The developed approach could be applied for the modification of PLA-based scaffolds for tissue engineering and will be further studied for molecular-imprinting of biomolecules on the surface of polyester-based materials for control of biointeractions.
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Affiliation(s)
- Viktor Korzhikov-Vlakh
- Institute of Chemistry, St. Petersburg State University, Universitetskii Pr. 26, Peterhoff, 198504 St. Petersburg, Russia.
| | - Maria Krylova
- Institute of Chemistry, St. Petersburg State University, Universitetskii Pr. 26, Peterhoff, 198504 St. Petersburg, Russia.
| | - Ekaterina Sinitsyna
- Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoy Pr. 31, 199004 St. Petersburg, Russia.
| | - Elena Ivankova
- Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoy Pr. 31, 199004 St. Petersburg, Russia.
| | - Ilia Averianov
- Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoy Pr. 31, 199004 St. Petersburg, Russia.
| | - Tatiana B Tennikova
- Institute of Chemistry, St. Petersburg State University, Universitetskii Pr. 26, Peterhoff, 198504 St. Petersburg, Russia.
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Yun YR, Pham LBH, Yoo YR, Lee S, Kim HW, Jang JH. Engineering of Self-Assembled Fibronectin Matrix Protein and Its Effects on Mesenchymal Stem Cells. Int J Mol Sci 2015; 16:19645-56. [PMID: 26295389 PMCID: PMC4581317 DOI: 10.3390/ijms160819645] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Revised: 07/30/2015] [Accepted: 08/12/2015] [Indexed: 01/21/2023] Open
Abstract
Fibronectin (FN) contributes to cell adhesion, proliferation, and differentiation in various cell types. To enhance the activity of fibronectin at the sites of focal adhesion, we engineered a novel recombinant fibronectin (FNIII10) fragment connected to the peptide amphiphile sequence (PA), LLLLLLCCCGGDS. In this study, the effects of FNIII10-PA on rat mesenchymal stem cells (rMSCs) were compared with those of FNIII10. FNIII10-PA showed the prominent protein adhesion activity. In addition, FNIII10-PA showed a significantly higher effect on adhesion, proliferation, and differentiation of rMSCs than FNIII10. Taken together, the FNIII10-containing self-assembled sequence enhanced rMSCs adhesion, proliferation, and differentiation.
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Affiliation(s)
- Ye-Rang Yun
- Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan 330-714, Korea.
- Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan 330-714, Korea.
| | - Le B Hang Pham
- Department of Biochemistry, Inha University School of Medicine, Incheon 400-712, Korea.
| | - Yie-Ri Yoo
- Department of Biochemistry, Inha University School of Medicine, Incheon 400-712, Korea.
| | - Sujin Lee
- Department of Biochemistry, Inha University School of Medicine, Incheon 400-712, Korea.
| | - Hae-Won Kim
- Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan 330-714, Korea.
- Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan 330-714, Korea.
- Department of Biomaterials Science, College of Dentistry, Dankook University, Cheonan 330-714, Korea.
| | - Jun-Hyeog Jang
- Department of Biochemistry, Inha University School of Medicine, Incheon 400-712, Korea.
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Walters NJ, Gentleman E. Evolving insights in cell-matrix interactions: elucidating how non-soluble properties of the extracellular niche direct stem cell fate. Acta Biomater 2015; 11:3-16. [PMID: 25266503 PMCID: PMC5833939 DOI: 10.1016/j.actbio.2014.09.038] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Revised: 08/22/2014] [Accepted: 09/22/2014] [Indexed: 12/26/2022]
Abstract
The role of soluble messengers in directing cellular behaviours has been recognized for decades. However, many cellular processes, including adhesion, migration and stem cell differentiation, are also governed by chemical and physical interactions with non-soluble components of the extracellular matrix (ECM). Among other effects, a cell's perception of nanoscale features such as substrate topography and ligand presentation, and its ability to deform the matrix via the generation of cytoskeletal tension play fundamental roles in these cellular processes. As a result, many biomaterials-based tissue engineering and regenerative medicine strategies aim to harness the cell's perception of substrate stiffness and nanoscale features to direct particular behaviours. However, since cell-ECM interactions vary considerably between two-dimensional (2-D) and three-dimensional (3-D) models, understanding their influence over normal and pathological cell responses in 3-D systems that better mimic the in vivo microenvironment is essential to translate such insights efficiently into medical therapies. This review summarizes the key findings in these areas and discusses how insights from 2-D biomaterials are being used to examine cellular behaviours in more complex 3-D hydrogel systems, in which not only matrix stiffness, but also degradability, plays an important role, and in which defining the nanoscale ligand presentation presents an additional challenge.
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Affiliation(s)
- Nick J Walters
- Division of Biomaterials & Tissue Engineering, UCL Eastman Dental Institute, London WC1X 8LD, UK
| | - Eileen Gentleman
- Craniofacial Development & Stem Cell Biology, King's College London, London SE1 9RT, UK.
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22
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Li A, Hokugo A, Yalom A, Berns EJ, Stephanopoulos N, McClendon MT, Segovia LA, Spigelman I, Stupp SI, Jarrahy R. A bioengineered peripheral nerve construct using aligned peptide amphiphile nanofibers. Biomaterials 2014; 35:8780-8790. [PMID: 25064803 DOI: 10.1016/j.biomaterials.2014.06.049] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Accepted: 06/25/2014] [Indexed: 02/07/2023]
Abstract
Peripheral nerve injuries can result in lifelong disability. Primary coaptation is the treatment of choice when the gap between transected nerve ends is short. Long nerve gaps seen in more complex injuries often require autologous nerve grafts or nerve conduits implemented into the repair. Nerve grafts, however, cause morbidity and functional loss at donor sites, which are limited in number. Nerve conduits, in turn, lack an internal scaffold to support and guide axonal regeneration, resulting in decreased efficacy over longer nerve gap lengths. By comparison, peptide amphiphiles (PAs) are molecules that can self-assemble into nanofibers, which can be aligned to mimic the native architecture of peripheral nerve. As such, they represent a potential substrate for use in a bioengineered nerve graft substitute. To examine this, we cultured Schwann cells with bioactive PAs (RGDS-PA, IKVAV-PA) to determine their ability to attach to and proliferate within the biomaterial. Next, we devised a PA construct for use in a peripheral nerve critical sized defect model. Rat sciatic nerve defects were created and reconstructed with autologous nerve, PLGA conduits filled with various forms of aligned PAs, or left unrepaired. Motor and sensory recovery were determined and compared among groups. Our results demonstrate that Schwann cells are able to adhere to and proliferate in aligned PA gels, with greater efficacy in bioactive PAs compared to the backbone-PA alone. In vivo testing revealed recovery of motor and sensory function in animals treated with conduit/PA constructs comparable to animals treated with autologous nerve grafts. Functional recovery in conduit/PA and autologous graft groups was significantly faster than in animals treated with empty PLGA conduits. Histological examinations also demonstrated increased axonal and Schwann cell regeneration within the reconstructed nerve gap in animals treated with conduit/PA constructs. These results indicate that PA nanofibers may represent a promising biomaterial for use in bioengineered peripheral nerve repair.
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Affiliation(s)
- Andrew Li
- Division of Plastic and Reconstructive Surgery, Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles CA, 90095-6960, USA
| | - Akishige Hokugo
- Division of Plastic and Reconstructive Surgery, Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles CA, 90095-6960, USA
| | - Anisa Yalom
- Division of Plastic and Reconstructive Surgery, Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles CA, 90095-6960, USA
| | - Eric J Berns
- Institute for Bionanotechnology in Medicine, Northwestern University, Evanston, IL, 60208, USA.,Department of Biomedical Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Nicholas Stephanopoulos
- Institute for Bionanotechnology in Medicine, Northwestern University, Evanston, IL, 60208, USA
| | - Mark T McClendon
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Luis A Segovia
- Division of Plastic and Reconstructive Surgery, Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles CA, 90095-6960, USA
| | - Igor Spigelman
- Division of Oral Biology and Medicine, UCLA School of Dentistry, Los Angeles CA, 90095 USA
| | - Samuel I Stupp
- Institute for Bionanotechnology in Medicine, Northwestern University, Evanston, IL, 60208, USA.,Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA.,Department of Chemistry, Northwestern University, Evanston, IL, 60208, USA.,Department of Medicine, Northwestern University, Evanston, IL, 60208, USA
| | - Reza Jarrahy
- Division of Plastic and Reconstructive Surgery, Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles CA, 90095-6960, USA
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Hou X, Li Q, Cao A. Solvent annealing-induced microphase-separation of polystyrene-b-polylactide block copolymer aimed at preparation of ordered nanoparticles/block copolymer hybrid thin film. JOURNAL OF POLYMER RESEARCH 2014. [DOI: 10.1007/s10965-014-0491-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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24
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Yang J, Liang Y, Shi W, Lee HS, Han CC. Effects of surface wetting induced segregation on crystallization behaviors of melt-miscible poly(l-lactide)-block-poly(ethylene glycol) copolymer thin film. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.05.032] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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25
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Schmitt SK, Murphy WL, Gopalan P. Crosslinked PEG mats for peptide immobilization and stem cell adhesion. J Mater Chem B 2013; 1:1349-1360. [PMID: 32260808 DOI: 10.1039/c2tb00253a] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We have designed a lightly crosslinked PEG based copolymer coating with compositional flexibility as well as extended stability for studying human mesenchymal stem cells (hMSCs). Copolymers contain a majority of poly(ethylene glycol) methyl ether methacrylate (PEGMEMA) as a cytophobic background with poly(ethylene glycol) methacrylate (PEGMA) for peptide coupling, and less than 10% glycidyl methacrylate (GMA) for crosslinking. Copolymer thin films were crosslinked into 30 nm thick mats by either thermal treatment or ultraviolet light and were stable for 35 days in water at 37 °C. The amount of PEGMA in the copolymer was optimized to ∼11% to minimize non-specific cell-protein interactions while maximizing the amount of total bound peptides. Following the binding of RGDSP to the mat, hMSCs were seeded. The hMSC adhesion, spreading and focal adhesion complex formation were promoted in a concentration dependent manner. Mats coupled with a non-adhesive scramble (RDGSP) maintained their cytophobicity. Competitive detachment experiments further demonstrated that cell adhesion was mediated by receptor binding to the RGDSP peptide. Cell culture experiments performed at 1 and 2 weeks show that mats can still resist cell adhesion after incubation in a serum containing medium. X-ray photoelectron spectroscopy (XPS) was effectively used to quantify the average total peptide concentration as 12.6 ± 6.14 pmol cm-2. A square 2.2 mm N (1s) element map shows an average value of 17.9 pmol cm-2 of RGDSP, which correlates well with the multipoint high resolution data. The stability of the copolymer, compositional flexibility, ease of application and the ability to precisely quantify bound peptides on the mats make these materials ideal for the study of cellular processes, where stability, functionality and topography of the biointerface are relevant.
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Affiliation(s)
- Samantha K Schmitt
- Department of Material Science and Engineering, University of Wisconsin, Madison, WI 53706, USA.
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26
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Rechenmacher F, Neubauer S, Polleux J, Mas-Moruno C, De Simone M, Cavalcanti-Adam EA, Spatz JP, Fässler R, Kessler H. Functionalizing αvβ3- or α5β1-Selective Integrin Antagonists for Surface Coating: A Method To Discriminate Integrin Subtypes In Vitro. Angew Chem Int Ed Engl 2012; 52:1572-5. [DOI: 10.1002/anie.201206370] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Revised: 10/03/2012] [Indexed: 11/10/2022]
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27
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Rechenmacher F, Neubauer S, Polleux J, Mas-Moruno C, De Simone M, Cavalcanti-Adam EA, Spatz JP, Fässler R, Kessler H. Funktionalisierung αvβ3- oder α5β1-selektiver Integrinantagonisten für die Oberflächenbeschichtung: ein Hilfsmittel zur Unterscheidung von Integrinsubtypen in vitro. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201206370] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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28
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Chen D. Crystal behavior of semicrystalline polystyrene-block-poly(l-lactide) diblock copolymer in thin films with various structures. POLYM INT 2012. [DOI: 10.1002/pi.4426] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Dongju Chen
- School of Chemistry and Chemical Engineering; Liaoning Normal University; Dalian; 116029; PR China
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29
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Polyvalent display of RGD motifs on turnip yellow mosaic virus for enhanced stem cell adhesion and spreading. Acta Biomater 2012; 8:2978-85. [PMID: 22522012 DOI: 10.1016/j.actbio.2012.04.027] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Revised: 04/11/2012] [Accepted: 04/12/2012] [Indexed: 11/22/2022]
Abstract
Turnip yellow mosaic virus (TYMV) is a stable 28 nm icosahedral plant virus that can be isolated in gram quantities. In order to study the polyvalent effect of Arg-Gly-Asp (RGD) clustering on the response of bone marrow stem cells (BMSCs), an RGD motif was genetically displayed on the coat protein of the TYMV capsid. Composite films composed of either wild-type TYMV or TYMV-RGD44, in combination with poly(allylamine hydrochloride) (PAH), were fabricated by a layer-by-layer adsorption of virus and PAH. The deposition process was studied by quartz crystal microbalance, UV-visible spectroscopy and atomic force microscopy. BMSC adhesion assays showed enhanced cell adhesion and spreading on TYMV-RGD44 coated substrates compared to native TYMV. These results demonstrate the potential of TYMV as a viable scaffold for bioactive peptide display and cell culturing studies.
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Dong H, Esser-Kahn AP, Thakre PR, Patrick JF, Sottos NR, White SR, Moore JS. Chemical treatment of poly(lactic acid) fibers to enhance the rate of thermal depolymerization. ACS APPLIED MATERIALS & INTERFACES 2012; 4:503-509. [PMID: 22008224 DOI: 10.1021/am2010042] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
When heated, poly(lactic acid) (PLA) fibers depolymerize in a controlled manner, making them potentially useful as sacrificial fibers for microchannel fabrication. Catalysts that increase PLA depolymerization rates are explored and methods to incorporate them into commercially available PLA fibers by a solvent mixture impregnating technique are tested. In the present study, the most active catalysts are identified that are capable of lowering the depolymerization temperature of modified PLA fibers by ca. 100 °C as compared to unmodified ones. Lower depolymerization temperatures allow PLA fibers to be removed from a fully cured epoxy thermoset resin without causing significant thermal damage to the epoxy. For 500 μm diameter PLA fibers, the optimized treatment involves soaking the fibers for 24 h in a solvent mixture containing 60% trifluoroethanol (TFE) and 40% H(2)O dispersed with 10 wt % tin(II) oxalate and subsequent air-drying of the fibers. PLA fibers treated with this procedure are completely removed when heated to 180 °C in vacuo for 20 h. The time evolution of catalytic depolymerization of PLA fiber is investigated by gel permeation chromatography (GPC). Channels fabricated by vaporization of sacrificial components (VaSC) are subsequently characterized by scanning electron microscopy (SEM) and X-ray microtomography (Micro CT) to show the presence of residual catalysts.
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Affiliation(s)
- Hefei Dong
- Beckman Institute for Advanced Science and Technology, 405 N Mathews Avenue, University of Illinois at Urbana-Champaign, USA
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Abstract
Atom Transfer Radical Polymerization (ATRP) is an effective technique for the design and preparation of multifunctional, nanostructured materials for a variety of applications in biology and medicine. ATRP enables precise control over macromolecular structure, order, and functionality, which are important considerations for emerging biomedical designs. This article reviews recent advances in the preparation of polymer-based nanomaterials using ATRP, including polymer bioconjugates, block copolymer-based drug delivery systems, cross-linked microgels/nanogels, diagnostic and imaging platforms, tissue engineering hydrogels, and degradable polymers. It is envisioned that precise engineering at the molecular level will translate to tailored macroscopic physical properties, thus enabling control of the key elements for realized biomedical applications.
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Affiliation(s)
- Daniel J. Siegwart
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, 2 USA
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, 2 USA
| | - Jung Kwon Oh
- Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke Street West, Montreal, Quebec, Canada H4B 1R6
| | - Krzysztof Matyjaszewski
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, USA
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Wu S, Wells A, Griffith LG, Lauffenburger DA. Controlling multipotent stromal cell migration by integrating "course-graining" materials and "fine-tuning" small molecules via decision tree signal-response modeling. Biomaterials 2011; 32:7524-31. [PMID: 21782235 PMCID: PMC3156355 DOI: 10.1016/j.biomaterials.2011.06.050] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2011] [Accepted: 06/21/2011] [Indexed: 12/14/2022]
Abstract
Biomimetic scaffolds have been proposed as a means to facilitate tissue regeneration by multi-potent stromal cells (MSCs). Effective scaffold colonization requires a control of multiple MSC responses including survival, proliferation, differentiation, and migration. As MSC migration is relatively unstudied in this context, we present here a multi-level approach to its understanding and control, integratively tuning cell speed and directional persistence to achieve maximal mean free path (MFP) of migration. This approach employs data-driven computational modeling to ascertain small molecule drug treatments that can enhance MFP on a given materials substratum. Using poly(methyl methacrylate)-graft-poly(ethylene oxide) polymer surfaces tethered with epidermal growth factor (tEGF) and systematically adsorbed with fibronectin, vitronectin, or collagen-I to present hTERT-immortalized human MSCs with growth factor and extracellular matrix cues, we measured cell motility properties along with signaling activities of EGFR, ERK, Akt, and FAK on 19 different substrate conditions. Speed was consistent on collagen/tEGF substrates, but low associated directional persistence limited MFP. Decision tree modeling successfully predicted that ERK inhibition should enhance MFP on collagen/tEGF substrates by increasing persistence. Thus, we demonstrated a two-tiered approach to control MSC migration: materials-based "coarse-graining" complemented by small molecule "fine-tuning".
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Affiliation(s)
- Shan Wu
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
| | - Alan Wells
- Department of Pathology, University of Pittsburgh, Pittsburgh, PA 15213
| | - Linda G. Griffith
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
| | - Douglas A. Lauffenburger
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
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Huang Y, Ren J, Ren T, Gu S, Tan Q, Zhang L, Lv K, Pan K, Jiang X. Bone marrow stromal cells cultured on poly (lactide-co-glycolide)/nano-hydroxyapatite composites with chemical immobilization of Arg-Gly-Asp peptide and preliminary bone regeneration of mandibular defect thereof. J Biomed Mater Res A 2010; 95:993-1003. [PMID: 20872750 DOI: 10.1002/jbm.a.32922] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2007] [Revised: 05/20/2010] [Accepted: 05/21/2010] [Indexed: 11/10/2022]
Abstract
Polyethyleneimine (PEI) was used to create active groups on the poly (lactide-co-glycolide)/nano-hydroxyapatite (PLGA/NHA) surface and Arg-Gly-Asp (RGD) was grafted on the active groups and novel PLGA/NHA 2-D membranes and 3D scaffolds modified with RGD were obtained. X-ray photoelectron spectrum (XPS) results show that sulfur displays only on the modified surface. The RGD-modified PLGA/NHA materials also have much lower static water contact angle and much higher water-absorption ability, which shows that after chemical treatment, the modified materials show better hydrophilic properties. Atomic force microscope (AFM) shows that after surface modification, the surface morphology of PLGA is greatly changed. All these results indicate that RGD peptide has successfully grafted on the surface of PLGA. Rabbit bone marrow stromal cells (MSCs) were seeded in the 2D membranes and 3D scaffolds materials. The influences of the RGD on the cell attachment, growth and differentiation, and proliferation on the different materials were studied. The modified scaffolds were implanted into rabbits to observe preliminary application in regeneration of mandibular defect. The PLGA/NHA-RGD presents better results in bone regeneration in rabbit mandibular defect.
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Affiliation(s)
- Yanxia Huang
- Institute of Nano- and Biopolymeric Materials, School of Material Science and Engineering, Tongji University, Shanghai, People's Republic of China
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Mitchell EA, Chaffey BT, McCaskie AW, Lakey JH, Birch MA. Controlled spatial and conformational display of immobilised bone morphogenetic protein-2 and osteopontin signalling motifs regulates osteoblast adhesion and differentiation in vitro. BMC Biol 2010; 8:57. [PMID: 20459712 PMCID: PMC2880964 DOI: 10.1186/1741-7007-8-57] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2009] [Accepted: 05/10/2010] [Indexed: 01/08/2023] Open
Abstract
Background The interfacial molecular mechanisms that regulate mammalian cell growth and differentiation have important implications for biotechnology (production of cells and cell products) and medicine (tissue engineering, prosthetic implants, cancer and developmental biology). We demonstrate here that engineered protein motifs can be robustly displayed to mammalian cells in vitro in a highly controlled manner using a soluble protein scaffold designed to self assemble on a gold surface. Results A protein was engineered to contain a C-terminal cysteine that would allow chemisorption to gold, followed by 12 amino acids that form a water soluble coil that could switch to a hydrophobic helix in the presence of alkane thiols. Bioactive motifs from either bone morphogenetic protein-2 or osteopontin were added to this scaffold protein and when assembled on a gold surface assessed for their ability to influence cell function. Data demonstrate that osteoblast adhesion and short-term responsiveness to bone morphogenetic protein-2 is dependent on the surface density of a cell adhesive motif derived from osteopontin. Furthermore an immobilised cell interaction motif from bone morphogenetic protein supported bone formation in vitro over 28 days (in the complete absence of other osteogenic supplements). In addition, two-dimensional patterning of this ligand using a soft lithography approach resulted in the spatial control of osteogenesis. Conclusion These data describe an approach that allows the influence of immobilised protein ligands on cell behaviour to be dissected at the molecular level. This approach presents a durable surface that allows both short (hours or days) and long term (weeks) effects on cell activity to be assessed. This widely applicable approach can provide mechanistic insight into the contribution of immobilised ligands in the control of cell activity.
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Affiliation(s)
- Elizabeth A Mitchell
- Institute for Cellular Medicine, The Medical School, Newcastle University, Newcastle-upon-Tyne, NE2 4HH, UK
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35
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Lee B, Schubert R, Cheung Y, Zannier F, Wei Q, Sacchi D, Sia S. Strongly Binding Cell-Adhesive Polypeptides of Programmable Valencies. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200906482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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36
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Chung K, DeQUACH JA, Christman KL. NANOPATTERNED INTERFACES FOR CONTROLLING CELL BEHAVIOR. NANO LIFE 2010; 1:63-77. [PMID: 25383101 PMCID: PMC4221096 DOI: 10.1142/s1793984410000055] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Many studies have demonstrated that microscale changes to surface chemistry and topography affect cell adhesion, proliferation, differentiation, and gene expression. More recently, studies have begun to examine cell behavior interactions with structures on the nanoscale since in vivo, cells recognize and adhere to cell adhesion receptors that are spatially organized on this scale. These studies have been enabled through various fabrication methods, many of which were initially developed for the semiconductor industry. This review explores cell responses to a variety of controlled topographical and biochemical cues using an assortment of nanoscale fabrication methods in order to elucidate which pattern dimensions are beneficial for controlling cell adhesion and differentiation.
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Affiliation(s)
- Kevin Chung
- Department of Bioengineering, University of California, San Diego, 9500 Gilman Drive La Jolla, CA 92093-0412, USA
| | - Jessica A DeQUACH
- Department of Bioengineering, University of California, San Diego, 9500 Gilman Drive La Jolla, CA 92093-0412, USA
| | - Karen L Christman
- Department of Bioengineering, University of California, San Diego, 9500 Gilman Drive La Jolla, CA 92093-0412, USA
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38
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Lee B, Schubert R, Cheung Y, Zannier F, Wei Q, Sacchi D, Sia S. Strongly Binding Cell-Adhesive Polypeptides of Programmable Valencies. Angew Chem Int Ed Engl 2010; 49:1971-5. [DOI: 10.1002/anie.200906482] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Joralemon MJ, McRae S, Emrick T. PEGylated polymers for medicine: from conjugation to self-assembled systems. Chem Commun (Camb) 2010; 46:1377-93. [PMID: 20162127 DOI: 10.1039/b920570p] [Citation(s) in RCA: 194] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthetic polymers have transformed society in many areas of science and technology, including recent breakthroughs in medicine. Synthetic polymers now offer unique and versatile platforms for drug delivery, as they can be "bio-tailored" for applications as implants, medical devices, and injectable polymer-drug conjugates. However, while several currently used therapeutic proteins and small molecule drugs have benefited from synthetic polymers, the full potential of polymer-based drug delivery platforms has not yet been realized. This review examines both general advantages and specific cases of synthetic polymers in drug delivery, focusing on PEGylation in the context of polymer architecture, self-assembly, and conjugation techniques that show considerable effectiveness and/or potential in therapeutics.
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Affiliation(s)
- Maisie J Joralemon
- Department of Polymer Science & Engineering, University of Massachusetts, Amherst, MA 01003, USA
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40
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Třesohlavá E, Popelka Š, Machová L, Rypáček F. Modification of Polylactide Surfaces with Lactide-Ethylene Oxide Functional Block Copolymers: Accessibility of Functional Groups. Biomacromolecules 2009; 11:68-75. [DOI: 10.1021/bm900889b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Eliška Třesohlavá
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky sq. 2, Prague 6, 162 06, Czech Republic
| | - Štěpán Popelka
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky sq. 2, Prague 6, 162 06, Czech Republic
| | - Ludka Machová
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky sq. 2, Prague 6, 162 06, Czech Republic
| | - František Rypáček
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky sq. 2, Prague 6, 162 06, Czech Republic
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41
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Qian Z, Minnikanti VS, Sauer BB, Dee GT, Kampert WG, Archer LA. Surface tension of polystyrene blends: Theory and experiment. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/polb.21771] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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42
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Rasal RM, Hirt DE. Micropatterning of Covalently Attached Biotin on Poly(lactic acid) Film Surfaces. Macromol Biosci 2009; 9:989-96. [DOI: 10.1002/mabi.200800374] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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43
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Jiang Z, Wang R, Xue G. Morphology and Phase Diagram of Comb Block Copolymer Am+1(BC)m. J Phys Chem B 2009; 113:7462-7. [DOI: 10.1021/jp811281t] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhibin Jiang
- Department of Polymer Science and Engineering, State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Rong Wang
- Department of Polymer Science and Engineering, State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Gi Xue
- Department of Polymer Science and Engineering, State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
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44
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Bearinger JP, Stone G, Dugan LC, El Dasher B, Stockton C, Conway JW, Kuenzler T, Hubbell JA. Porphyrin-based photocatalytic nanolithography: a new fabrication tool for protein arrays. Mol Cell Proteomics 2009; 8:1823-31. [PMID: 19406753 DOI: 10.1074/mcp.m800585-mcp200] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Nanoarray fabrication is a multidisciplinary endeavor encompassing materials science, chemical engineering, and biology. We formed nanoarrays via a new technique, porphyrin-based photocatalytic nanolithography. The nanoarrays, with controlled features as small as 200 nm, exhibited regularly ordered patterns and may be appropriate for (a) rapid and parallel proteomics screening of immobilized biomolecules, (b) protein-protein interactions, and/or (c) biophysical and molecular biology studies involving spatially dictated ligand placement. We demonstrated protein immobilization utilizing nanoarrays fabricated via photocatalytic nanolithography on silicon substrates where the immobilized proteins are surrounded by a non-fouling polymer background.
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Affiliation(s)
- Jane P Bearinger
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
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45
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Place ES, George JH, Williams CK, Stevens MM. Synthetic polymer scaffolds for tissue engineering. Chem Soc Rev 2009; 38:1139-51. [DOI: 10.1039/b811392k] [Citation(s) in RCA: 582] [Impact Index Per Article: 38.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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46
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Baxamusa SH, Im SG, Gleason KK. Initiated and oxidative chemical vapor deposition: a scalable method for conformal and functional polymer films on real substrates. Phys Chem Chem Phys 2009; 11:5227-40. [DOI: 10.1039/b900455f] [Citation(s) in RCA: 120] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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47
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Baxamusa SH, Gleason KK. Thin Polymer Films with High Step Coverage in Microtrenches by Initiated CVD. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/cvde.200806713] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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48
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Qian Z, Minnikanti VS, Archer LA. Surface segregation of highly branched polymer additives in linear hosts. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/polb.21512] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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49
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Mikhail AS, Jones KS, Sheardown H. Dendrimer-grafted cell adhesion peptide-modified PDMS. Biotechnol Prog 2008; 24:938-44. [DOI: 10.1002/btpr.5] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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50
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Qian Z, Minnikanti VS, Sauer BB, Dee GT, Archer LA. Surface Tension of Symmetric Star Polymer Melts. Macromolecules 2008. [DOI: 10.1021/ma8002888] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhenyu Qian
- School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, and Central Research and Development, Experiment Station, DuPont, Wilmington, Delaware 19880
| | - Venkatachala S. Minnikanti
- School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, and Central Research and Development, Experiment Station, DuPont, Wilmington, Delaware 19880
| | - Bryan B. Sauer
- School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, and Central Research and Development, Experiment Station, DuPont, Wilmington, Delaware 19880
| | - Gregory T. Dee
- School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, and Central Research and Development, Experiment Station, DuPont, Wilmington, Delaware 19880
| | - Lynden A. Archer
- School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, and Central Research and Development, Experiment Station, DuPont, Wilmington, Delaware 19880
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