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McCarthy E, Thomas J, Oppenheimer R, Rickard JJS, Goldberg P. Collagen-Electrohydrodynamic Hierarchical Lithography for Biomimetic Photonic Micro-Nanomaterials. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2402565. [PMID: 38923716 DOI: 10.1002/smll.202402565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2024] [Revised: 05/27/2024] [Indexed: 06/28/2024]
Abstract
Biologically engineered nanomaterials give rise to unique and intriguing properties, which are not available in nature. The full-realization of such has been hindered by the lack of robust and straightforward techniques to produce the required architectures. Here a new bottomup bionano-engineering route is developed to construct nanomaterials using a guided assembly of collagen building blocks, establishing a lithographic process for three-dimensional collagen-based hierarchical micronano-architectures. By introducing optimized hybrid electro-hydrodynamic micronano-lithography exploiting collagen molecules as biological building blocks to self-assemble into a complex variety of structures, quasi-ordered mimics of metamaterials-like are constructed. The tailor-designed engineered apparatus generates the underlying substrates with vertical orientation of collagen at controlled speeds. Templating these hierarchical structures into inorganic materials allows the replication of their network into periodic metal micronano-assemblies. These generate substrates with interesting optical properties, suggesting that size-and-orientation dependent nanofilaments with varying degree of lateral order yield distinctly coloured structures with characteristic optical spectra correlated with observed colours, which varying diameters and interspacing, are attributable to coherent scattering by different periodicity of each fibrous micronano-structure. The artificial mimics display similar optical characteristics to the natural butterfly wing's structure, known to exhibit extraordinary electromagnetic properties, driving future applications in cloaking, super-lenses, photovoltaics and photodetectors.
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Affiliation(s)
- Emma McCarthy
- School of Chemical Engineering, Advanced Nanomaterials Structures and Applications Laboratories, College of Engineering and Physical Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
- CMR Surgical, Business Park, Milton Road, Cambridge, CB24 9NG, UK
| | - Jarrod Thomas
- School of Chemical Engineering, Advanced Nanomaterials Structures and Applications Laboratories, College of Engineering and Physical Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Roni Oppenheimer
- School of Chemical Engineering, Advanced Nanomaterials Structures and Applications Laboratories, College of Engineering and Physical Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Jonathan J S Rickard
- School of Chemical Engineering, Advanced Nanomaterials Structures and Applications Laboratories, College of Engineering and Physical Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
- Department of Physics, Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK
| | - Pola Goldberg
- School of Chemical Engineering, Advanced Nanomaterials Structures and Applications Laboratories, College of Engineering and Physical Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
- Healthcare Technologies Institute, Institute of Translational Medicine, Mindelsohn Way, Birmingham, B15 2TH, UK
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2
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Bertolini S, Delcorte A. Molecular Dynamics Simulations of Soft and Reactive Landing of Proteins Desorbed by Argon Cluster Bombardment. J Phys Chem B 2024; 128:6716-6729. [PMID: 38975731 DOI: 10.1021/acs.jpcb.4c01698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/09/2024]
Abstract
Reactive molecular dynamics (MD) simulations were conducted to investigate the soft and reactive landing of hyperthermal velocity proteins transferred to a vacuum using large argon clusters. Experimentally, the interaction of argon cluster ion beams (Ar1000-5000+) with a target biofilm was previously used in such a manner to transfer lysozymes onto a collector with the retention of their bioactivity, paving the way to a new solvent-free method for complex biosurface nanofabrication. However, the experiments did not give access to a microscopic view of the interactions needed for their full understanding, which can be provided by the MD model. Our reactive force field simulations clarify the landing mechanisms of the lysozymes and their fragments on collectors with different natures (gold- and hydrogen-terminated graphite). The results highlight the conditions of soft and reactive landing on rigid surfaces, the effects of the protein structure, energy, and incidence angle before landing, and the adhesion forces with the collector substrate. Many of the obtained results can be generalized to other soft and reactive landing approaches used for biomolecules such as electrospray ionization and matrix-assisted laser desorption ionization.
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Affiliation(s)
- Samuel Bertolini
- Institute of Condensed Matter and Nanoscience, Université catholique de Louvain, 1 Place Louis Pasteur, 1348 Louvain-la-Neuve, Belgium
| | - Arnaud Delcorte
- Institute of Condensed Matter and Nanoscience, Université catholique de Louvain, 1 Place Louis Pasteur, 1348 Louvain-la-Neuve, Belgium
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3
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Delmez V, Tomasetti B, Daphnis T, Poleunis C, Lauzin C, Dupont-Gillain C, Delcorte A. Gas Cluster Ion Beams as a Versatile Soft-Landing Tool for the Controlled Construction of Thin (Bio)Films. ACS APPLIED BIO MATERIALS 2022; 5:3180-3192. [PMID: 35801397 DOI: 10.1021/acsabm.2c00169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Surface biofunctionalization with proteins is the key to many biomedical applications. In this study, a solvent-free method for the controlled construction of protein thin films is reported. Using large argon gas cluster ion beams, proteins are sputtered from a target (a pool of pure proteins), and collected on a chosen substrate, being nearly any solid material. Time-of-flight secondary ion mass spectrometry (ToF-SIMS) revealed the presence of intact protein molecules on the collectors. Furthermore, lowering the energy per atom in the cluster projectiles down to 1 eV/atom allowed more than 60% of bradykinin molecules to be transferred intact. This protein deposition method offers a precise control of the film thickness as the transferred protein quantity is proportional to the argon clusters ion dose reached for the transfer. This major feature enables building protein films from (sub)mono- to multilayers, without upper limitation of the thickness. A procedure was developed to measure the film thickness in situ the ToF-SIMS instrument. The versatility and potential of this soft-landing alternative for further applications is demonstrated on the one hand by building a protein thin film at the surface of paper, a substrate hardly compatible with solution-based adsorption methods. On the other hand, the possibility to achieve alternated multilayer buildup is demonstrated with the construction of a bilayer composed of bradykinin and Irganox, with the two layers well separated. These results lay the first stone toward original and complex multilayers that could previously not be considered with solution-based adsorption methods, and this regardless of the substrate nature.
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Affiliation(s)
- Vincent Delmez
- Institute of Condensed Matter and Nanosciences - Bio & Soft Matter, Université catholique de Louvain, Place Louis Pasteur, 1 bte L4.01.10, B-1348 Louvain-la-Neuve, Belgium
| | - Benjamin Tomasetti
- Institute of Condensed Matter and Nanosciences - Bio & Soft Matter, Université catholique de Louvain, Place Louis Pasteur, 1 bte L4.01.10, B-1348 Louvain-la-Neuve, Belgium
| | - Thomas Daphnis
- Institute of Condensed Matter and Nanosciences - Bio & Soft Matter, Université catholique de Louvain, Place Louis Pasteur, 1 bte L4.01.10, B-1348 Louvain-la-Neuve, Belgium
| | - Claude Poleunis
- Institute of Condensed Matter and Nanosciences - Bio & Soft Matter, Université catholique de Louvain, Place Louis Pasteur, 1 bte L4.01.10, B-1348 Louvain-la-Neuve, Belgium
| | - Clément Lauzin
- Institute of Condensed Matter and Nanosciences - Bio & Soft Matter, Université catholique de Louvain, Place Louis Pasteur, 1 bte L4.01.10, B-1348 Louvain-la-Neuve, Belgium
| | - Christine Dupont-Gillain
- Institute of Condensed Matter and Nanosciences - Bio & Soft Matter, Université catholique de Louvain, Place Louis Pasteur, 1 bte L4.01.10, B-1348 Louvain-la-Neuve, Belgium
| | - Arnaud Delcorte
- Institute of Condensed Matter and Nanosciences - Bio & Soft Matter, Université catholique de Louvain, Place Louis Pasteur, 1 bte L4.01.10, B-1348 Louvain-la-Neuve, Belgium
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4
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Delmez V, Degand H, Poleunis C, Moshkunov K, Chundak M, Dupont-Gillain C, Delcorte A. Deposition of Intact and Active Proteins In Vacuo Using Large Argon Cluster Ion Beams. J Phys Chem Lett 2021; 12:952-957. [PMID: 33443416 DOI: 10.1021/acs.jpclett.0c02510] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Providing inert materials with a biochemical function, for example using proteins, is a cornerstone technology underlying many applications. However, the controlled construction of protein thin films remains a major challenge. Here, an innovative solvent-free approach for protein deposition is reported, using lysozyme as a model. By diverting a time-of-flight secondary ion mass spectrometer (ToF-SIMS) from its standard analytical function, large argon clusters were used to achieve protein transfer. A target consisting of a pool of proteins was bombarded with 10 keV Ar5000+ ions, and the ejected proteins were collected on a silicon wafer. The ellipsoidal deposition pattern was evidenced by ToF-SIMS analysis, while SDS-PAGE electrophoresis confirmed the presence of intact lysozyme on the collector. Finally, enzymatic activity assays demonstrated the preservation of the three-dimensional structure of the transferred proteins. These results pave the way to well-controlled protein deposition using ion beams and to the investigation of more complex multilayer architectures.
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Affiliation(s)
- Vincent Delmez
- Institute of Condensed Matter and Nanosciences-Bio & Soft Matter, Université catholique de Louvain, Place Louis Pasteur, 1 bte L4.01.10, B-1348 Louvain-la-Neuve, Belgium
| | - Hervé Degand
- Institute of Biomolecular Science and Technology, Group of Molecular Physiology, Université catholique de Louvain, Croix du Sud 4-5, B-1348 Louvain-la-Neuve, Belgium
| | - Claude Poleunis
- Institute of Condensed Matter and Nanosciences-Bio & Soft Matter, Université catholique de Louvain, Place Louis Pasteur, 1 bte L4.01.10, B-1348 Louvain-la-Neuve, Belgium
| | - Konstantin Moshkunov
- Institute of Condensed Matter and Nanosciences-Bio & Soft Matter, Université catholique de Louvain, Place Louis Pasteur, 1 bte L4.01.10, B-1348 Louvain-la-Neuve, Belgium
| | - Mykhailo Chundak
- Institute of Condensed Matter and Nanosciences-Bio & Soft Matter, Université catholique de Louvain, Place Louis Pasteur, 1 bte L4.01.10, B-1348 Louvain-la-Neuve, Belgium
| | - Christine Dupont-Gillain
- Institute of Condensed Matter and Nanosciences-Bio & Soft Matter, Université catholique de Louvain, Place Louis Pasteur, 1 bte L4.01.10, B-1348 Louvain-la-Neuve, Belgium
| | - Arnaud Delcorte
- Institute of Condensed Matter and Nanosciences-Bio & Soft Matter, Université catholique de Louvain, Place Louis Pasteur, 1 bte L4.01.10, B-1348 Louvain-la-Neuve, Belgium
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5
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Zhao X, Zuo X, Zhong J, Wang B, Li S, Xiao Y, Yuan J. Heparin-Modified Amniotic Membrane Combined With Growth Factors for Promoting Corneal Wound Healing After Alkali Burn. Front Bioeng Biotechnol 2020; 8:599800. [PMID: 33330430 PMCID: PMC7719686 DOI: 10.3389/fbioe.2020.599800] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 10/27/2020] [Indexed: 12/13/2022] Open
Abstract
Ocular chemical burns are potentially blinding ocular injuries and require urgent management. Amniotic membrane (AM) transplantation is an effective surgical treatment, one of the reasons is because AM is a rich source of growth factors that can promote epithelialization and wound healing. However, growth factors will be gradually lost and insufficient after preparation process and long-time storage, leading to unsatisfactory therapeutic effects. Herein, we present a modified AM (AM-HEP) for the supplement and sustained release of growth factor by surface grafting heparin for treatment of ocular chemical burns. Heparin grafting rate and stability, microstructure, physical property, and sustained release of epithelial growth factor (EGF) of AM-HEP were characterized. Biocompatibility and ability to promote corneal epithelial cell growth and migration were evaluated and compared with a biological amnion, which is available on the market in vitro. The therapeutic effects of AM-HEP combined with EGF (AM-HEP@EGF) in vivo had been evaluated in a model of mouse corneal alkali burn. The results indicated that heparin was introduced into AM and maintain stability over 3 weeks at 37°C. The modification process of AM-HEP did not affect microstructure and physical property after comparing with non-modified AM. EGF could be combined quickly and effectively with AM-HEP; the sustained release could last for more than 14 days. AM-HEP@EGF could significantly promote corneal epithelial cell growth and migration, compared with non-modified AM and control group. Faster corneal epithelialization was observed with the transplantation of AM-HEP@EGF in vivo, compared with the untreated control group. The corneas in the AM-HEP@EGF group have less inflammation and were more transparent than those in the control group. The results from in vitro and in vivo experiments demonstrated that AM-HEP@EGF could significantly enhance the therapeutic effects. Taken together, AM-HEP@EGF is exhibited to be a potent clinical application in corneal alkali burns through accelerating corneal epithelial wound healing.
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Affiliation(s)
| | | | | | | | | | | | - Jin Yuan
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
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6
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Lin J, Shi Y, Men Y, Wang X, Ye J, Zhang C. Mechanical Roles in Formation of Oriented Collagen Fibers. TISSUE ENGINEERING PART B-REVIEWS 2020; 26:116-128. [PMID: 31801418 DOI: 10.1089/ten.teb.2019.0243] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Collagen is a structural protein that is widely present in vertebrates, being usually distributed in tissues in the form of fibers. In living organisms, fibers are organized in different orientations in various tissues. As the structural base in connective tissue and load-bearing tissue, the orientation of collagen fibers plays an extremely important role in the mechanical properties and physiological and biochemical functions. The study on mechanics role in formation of oriented collagen fibers enables us to understand how discrete cells use limited molecular materials to create tissues with different structures, thereby promoting our understanding of the mechanism of tissue formation from scratch, from invisible to tangible. However, the current understanding of the mechanism of fiber orientation is still insufficient. In addition, existing fabrication methods of oriented fibers are varied and involve interdisciplinary study, and the achievements of each experiment are favorable to the construction and improvement of the fiber orientation theory. To this end, this review focuses on the preparation methods of oriented fibers and proposes a model explaining the formation process of oriented fibers in tendons based on the existing fiber theory. Impact statement As the structural base in connective tissue and load-bearing tissue, the orientation of collagen fibers plays an extremely important role in the mechanical properties and physiological and biochemical functions. However, the current understanding of the mechanism of fiber orientation is still insufficient, which is greatly responsible for the challenge of functional tissue repair and regeneration. Understanding the mechanism of fiber orientation can promote the successful application of fiber orientation scaffolds in tissue repair and regeneration, as well as providing an insight for the mechanism of tissue histomorphology.
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Affiliation(s)
- Jiexiang Lin
- Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, National Demonstration Center for Experimental Mechanical and Electrical Engineering Education, School of Mechanical Engineering, Tianjin University of Technology, Tianjin, P.R. China
| | - Yanping Shi
- Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, National Demonstration Center for Experimental Mechanical and Electrical Engineering Education, School of Mechanical Engineering, Tianjin University of Technology, Tianjin, P.R. China
| | - Yutao Men
- Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, National Demonstration Center for Experimental Mechanical and Electrical Engineering Education, School of Mechanical Engineering, Tianjin University of Technology, Tianjin, P.R. China
| | - Xin Wang
- Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, National Demonstration Center for Experimental Mechanical and Electrical Engineering Education, School of Mechanical Engineering, Tianjin University of Technology, Tianjin, P.R. China
| | - Jinduo Ye
- Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, National Demonstration Center for Experimental Mechanical and Electrical Engineering Education, School of Mechanical Engineering, Tianjin University of Technology, Tianjin, P.R. China
| | - Chunqiu Zhang
- Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, National Demonstration Center for Experimental Mechanical and Electrical Engineering Education, School of Mechanical Engineering, Tianjin University of Technology, Tianjin, P.R. China
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7
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Yang W, Li L, Su G, Zhang Z, Cao Y, Li X, Shi Y, Zhang Q. A collagen telopeptide binding peptide shows potential in aiding collagen bundle formation and fibril orientation. Biomater Sci 2017. [DOI: 10.1039/c6bm00574h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A double-armed CTBP-PEG-CTBP derivative of a collagen telopeptide binding peptide (CTBP), shows potential in aiding collagen bundle formation and fibril orientation by interacting with fibrils.
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Affiliation(s)
- Wenyu Yang
- The Key Laboratory of Biomedical Material of Tianjin
- Institute of Biomedical Engineering
- Chinese Academy of Medical Sciences
- Peking Union Medical College
- Tianjin
| | - Lin Li
- The Key Laboratory of Biomedical Material of Tianjin
- Institute of Biomedical Engineering
- Chinese Academy of Medical Sciences
- Peking Union Medical College
- Tianjin
| | - Guanghao Su
- The Key Laboratory of Biomedical Material of Tianjin
- Institute of Biomedical Engineering
- Chinese Academy of Medical Sciences
- Peking Union Medical College
- Tianjin
| | - Zhe Zhang
- The Key Laboratory of Biomedical Material of Tianjin
- Institute of Biomedical Engineering
- Chinese Academy of Medical Sciences
- Peking Union Medical College
- Tianjin
| | - Yiting Cao
- The Key Laboratory of Biomedical Material of Tianjin
- Institute of Biomedical Engineering
- Chinese Academy of Medical Sciences
- Peking Union Medical College
- Tianjin
| | - Xuemin Li
- The Key Laboratory of Biomedical Material of Tianjin
- Institute of Biomedical Engineering
- Chinese Academy of Medical Sciences
- Peking Union Medical College
- Tianjin
| | - Yanping Shi
- School of Chemistry and Chemical Engineering
- Tianjin University of Technology
- Tianjin
- PR China
| | - Qiqing Zhang
- The Key Laboratory of Biomedical Material of Tianjin
- Institute of Biomedical Engineering
- Chinese Academy of Medical Sciences
- Peking Union Medical College
- Tianjin
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Ramakrishnan S, Subramaniam S, Stewart AF, Grundmeier G, Keller A. Regular Nanoscale Protein Patterns via Directed Adsorption through Self-Assembled DNA Origami Masks. ACS APPLIED MATERIALS & INTERFACES 2016; 8:31239-31247. [PMID: 27779405 DOI: 10.1021/acsami.6b10535] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
DNA origami has become a widely used method for synthesizing well-defined nanostructures with promising applications in various areas of nanotechnology, biophysics, and medicine. Recently, the possibility to transfer the shape of single DNA origami nanostructures into different materials via molecular lithography approaches has received growing interest due to the great structural control provided by the DNA origami technique. Here, we use ordered monolayers of DNA origami nanostructures with internal cavities on mica surfaces as molecular lithography masks for the fabrication of regular protein patterns over large surface areas. Exposure of the masked sample surface to negatively charged proteins results in the directed adsorption of the proteins onto the exposed surface areas in the holes of the mask. By controlling the buffer and adsorption conditions, the protein coverage of the exposed areas can be varied from single proteins to densely packed monolayers. To demonstrate the versatility of this approach, regular nanopatterns of four different proteins are fabricated: the single-strand annealing proteins Redβ and Sak, the iron-storage protein ferritin, and the blood protein bovine serum albumin (BSA). We furthermore demonstrate the desorption of the DNA origami mask after directed protein adsorption, which may enable the fabrication of hierarchical patterns composed of different protein species. Because selectivity in adsorption is achieved by electrostatic interactions between the proteins and the exposed surface areas, this approach may enable also the large-scale patterning of other charged molecular species or even nanoparticles.
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Affiliation(s)
- Saminathan Ramakrishnan
- Technical and Macromolecular Chemistry, Paderborn University , Warburger Strasse 100, 33098 Paderborn, Germany
| | - Sivaraman Subramaniam
- Department of Genomics, Biotechnology Center, Technische Universität Dresden , Tatzberg 47-51, 01307 Dresden, Germany
| | - A Francis Stewart
- Department of Genomics, Biotechnology Center, Technische Universität Dresden , Tatzberg 47-51, 01307 Dresden, Germany
| | - Guido Grundmeier
- Technical and Macromolecular Chemistry, Paderborn University , Warburger Strasse 100, 33098 Paderborn, Germany
| | - Adrian Keller
- Technical and Macromolecular Chemistry, Paderborn University , Warburger Strasse 100, 33098 Paderborn, Germany
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9
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Hariya T, Tanaka Y, Yokokura S, Nakazawa T. Transparent, resilient human amniotic membrane laminates for corneal transplantation. Biomaterials 2016; 101:76-85. [DOI: 10.1016/j.biomaterials.2016.05.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Accepted: 05/24/2016] [Indexed: 10/21/2022]
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10
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Marín-Pareja N, Cantini M, González-García C, Salvagni E, Salmerón-Sánchez M, Ginebra MP. Different Organization of Type I Collagen Immobilized on Silanized and Nonsilanized Titanium Surfaces Affects Fibroblast Adhesion and Fibronectin Secretion. ACS APPLIED MATERIALS & INTERFACES 2015; 7:20667-20677. [PMID: 26322620 DOI: 10.1021/acsami.5b05420] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Silanization has emerged in recent years as a way to obtain a stronger and more stable attachment of biomolecules to metallic substrates. However, its impact on protein conformation, a key aspect that influences cell response, has hardly been studied. In this work, we analyzed by atomic force microscopy (AFM) the distribution and conformation of type I collagen on plasma-treated surfaces before and after silanization. Subsequently, we investigated the effect of the different collagen conformations on fibroblasts adhesion and fibronectin secretion by immunofluorescence analyses. Two different organosilanes were used on plasma-treated titanium surfaces, either 3-chloropropyl-triethoxy-silane (CPTES) or 3-glycidyloxypropyl-triethoxy-silane (GPTES). The properties and amount of the adsorbed collagen were assessed by contact angle, X-ray photoelectron spectroscopy, optical waveguide lightmode spectroscopy, and AFM. AFM studies revealed different conformations of type I collagen depending on the silane employed. Collagen was organized in fibrillar networks over very hydrophilic (plasma treated titanium) or hydrophobic (silanized with CPTES) surfaces, the latter forming little globules with a beads-on-a-string appearance, whereas over surfaces presenting an intermediate hydrophobic character (silanized with GPTES), collagen was organized into clusters with a size increasing at higher protein concentration in solution. Cell response was strongly affected by collagen conformation, especially at low collagen density. The samples exhibiting collagen organized in globular clusters (GPTES-functionalized samples) favored a faster and better fibroblast adhesion as well as better cell spreading, focal adhesions formation, and more pronounced fibronectin fibrillogenesis. In contrast, when a certain protein concentration was reached at the material surface, the effect of collagen conformation was masked, and similar fibroblast response was observed in all samples.
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Affiliation(s)
- Nathalia Marín-Pareja
- Biomaterials, Biomechanics, and Tissue Engineering Group, Department of Materials Science and Metallurgy, Universitat Politècnica de Catalunya. BarcelonaTech (UPC) , Av. Diagonal 647, 08028 Barcelona, Spain
| | - Marco Cantini
- Division of Biomedical Engineering, School of Engineering, University of Glasgow , Glasgow G12 8LT, U.K
| | - Cristina González-García
- Division of Biomedical Engineering, School of Engineering, University of Glasgow , Glasgow G12 8LT, U.K
| | - Emiliano Salvagni
- Biomaterials, Biomechanics, and Tissue Engineering Group, Department of Materials Science and Metallurgy, Universitat Politècnica de Catalunya. BarcelonaTech (UPC) , Av. Diagonal 647, 08028 Barcelona, Spain
| | - Manuel Salmerón-Sánchez
- Division of Biomedical Engineering, School of Engineering, University of Glasgow , Glasgow G12 8LT, U.K
| | - Maria-Pau Ginebra
- Biomaterials, Biomechanics, and Tissue Engineering Group, Department of Materials Science and Metallurgy, Universitat Politècnica de Catalunya. BarcelonaTech (UPC) , Av. Diagonal 647, 08028 Barcelona, Spain
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11
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Li H, Gong B, Qian CJ, Luo MB. Critical adsorption of a flexible polymer on a stripe-patterned surface. SOFT MATTER 2015; 11:3222-3231. [PMID: 25765551 DOI: 10.1039/c5sm00426h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The adsorption and dynamics of a polymer chain on a stripe-patterned surface composed of periodical attractive and neutral stripes are studied by using Monte Carlo simulation. The critical adsorption temperature Tc and pattern-recognition temperature Tr are estimated from the desorption probability, surface contact number, and bridge number. A phase diagram presenting three polymer states, including a desorbed state above Tc, a multi-stripe adsorbed state at an intermediate temperature Tr < T < Tc, and a single-stripe adsorbed state below Tr, is provided for infinitely long chains. Normal diffusion is always observed for a polymer in the direction parallel to the stripe even at low temperature. But in the direction perpendicular to the stripe, the polymer can freely diffuse above Tc, whereas the polymer is confined to one attractive stripe below Tr. However, the adsorbed polymer can hop from one attractive stripe to another at the intermediate temperature Tr < T < Tc.
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Affiliation(s)
- Hong Li
- Department of Physics, Wenzhou University, Wenzhou 325035, China.
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12
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Rudisill SG, DiVito MD, Hubel A, Stein A. In vitro collagen fibril alignment via incorporation of nanocrystalline cellulose. Acta Biomater 2015; 12:122-128. [PMID: 25449923 DOI: 10.1016/j.actbio.2014.10.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Revised: 09/25/2014] [Accepted: 10/19/2014] [Indexed: 12/29/2022]
Abstract
This study demonstrates a method for producing ordered collagen fibrils on a similar length scale to those in the cornea, using a one-pot liquid-phase synthesis. The alignment persists throughout samples on the mm scale. The addition of nanocrystalline cellulose (NCC), a biocompatible and widely available material, to collagen prior to gelation causes the fibrils to align and achieve a narrow size distribution (36±8nm). The effects of NCC loading in the composites on microstructure, transparency and biocompatibility are studied by scanning electron microscopy, ultraviolet-visible spectroscopy and cell growth experiments. A 2% loading of NCC increases the transparency of collagen while producing an ordered microstructure. A mechanism is proposed for the ordering behavior on the basis of enhanced hydrogen bonding during collagen gel formation.
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13
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Understanding and controlling type I collagen adsorption and assembly at interfaces, and application to cell engineering. Colloids Surf B Biointerfaces 2014; 124:87-96. [DOI: 10.1016/j.colsurfb.2014.08.029] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Revised: 08/21/2014] [Accepted: 08/22/2014] [Indexed: 02/01/2023]
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14
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Janson IA, Kong YP, Putnam AJ. Nanotopographic substrates of poly (methyl methacrylate) do not strongly influence the osteogenic phenotype of mesenchymal stem cells in vitro. PLoS One 2014; 9:e90719. [PMID: 24594848 PMCID: PMC3940926 DOI: 10.1371/journal.pone.0090719] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Accepted: 02/04/2014] [Indexed: 11/19/2022] Open
Abstract
The chemical, mechanical, and topographical features of the extracellular matrix (ECM) have all been documented to influence cell adhesion, gene expression, migration, proliferation, and differentiation. Topography plays a key role in the architecture and functionality of various tissues in vivo, thus raising the possibility that topographic cues can be instructive when incorporated into biomaterials for regenerative applications. In the literature, there are discrepancies regarding the potential roles of nanotopography to enhance the osteogenic phenotype of mesenchymal stem cells (MSC). In this study, we used thin film substrates of poly(methyl methacrylate) (PMMA) with nanoscale gratings to investigate the influence of nanotopography on the osteogenic phenotype of MSCs, focusing in particular on their ability to produce mineral similar to native bone. Topography influenced focal adhesion size and MSC alignment, and enhanced MSC proliferation after 14 days of culture. However, the osteogenic phenotype was minimally influenced by surface topography. Specifically, alkaline phosphatase (ALP) expression was not increased on nanotopographic films, nor was calcium deposition improved after 21 days in culture. Ca: P ratios were similar to native mouse bone on films with gratings of 415 nm width and 200 nm depth (G415) and 303 nm width and 190 nm depth (G303). Notably, all surfaces had Ca∶P ratios significantly lower than G415 films. Collectively, these data suggest that, PMMA films with nanogratings are poor drivers of an osteogenic phenotype.
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Affiliation(s)
- Isaac A. Janson
- Department of Material Science and Engineering, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Yen P. Kong
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Andrew J. Putnam
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, United States of America
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15
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Rich H, Odlyha M, Cheema U, Mudera V, Bozec L. Effects of photochemical riboflavin-mediated crosslinks on the physical properties of collagen constructs and fibrils. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2014; 25:11-21. [PMID: 24006048 PMCID: PMC3890585 DOI: 10.1007/s10856-013-5038-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Accepted: 08/27/2013] [Indexed: 05/27/2023]
Abstract
The use of collagen scaffold in tissue engineering is on the rise, as modifications to mechanical properties are becoming more effective in strengthening constructs whilst preserving the natural biocompatibility. The combined technique of plastic compression and cross-linking is known to increase the mechanical strength of the collagen construct. Here, a modified protocol for engineering these collagen constructs is used to bring together a plastic compression method, combined with controlled photochemical crosslinking using riboflavin as a photoinitiator. In order to ascertain the effects of the photochemical crosslinking approach and the impact of the crosslinks created upon the properties of the engineered collagen constructs, the constructs were characterized both at the macroscale and at the fibrillar level. The resulting constructs were found to have a 2.5 fold increase in their Young's modulus, reaching a value of 650 ± 73 kPa when compared to non-crosslinked control collagen constructs. This value is not yet comparable to that of native tendon, but it proves that combining a crosslinking methodology to collagen tissue engineering may offer a new approach to create stronger, biomimetic constructs. A notable outcome of crosslinking collagen with riboflavin is the collagen's greater affinity for water; it was demonstrated that riboflavin crosslinked collagen retains water for a longer period of time compared to non-cross-linked control samples. The affinity of the cross-linked collagen to water also resulted in an increase of individual collagen fibrils' cross-sectional area as function of the crosslinking. These changes in water affinity and fibril morphology induced by the process of crosslinking could indicate that the crosslinked chains created during the photochemical crosslinking process may act as intermolecular hydrophilic nanosprings. These intermolecular nanosprings would be responsible for a change in the fibril morphology to accommodate variable volume of water within the fibril.
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Affiliation(s)
- Harvey Rich
- Division of Surgery and Interventional Science, UCL Tissue Repair and Engineering Centre, Institute of Orthopaedics and Musculoskeletal Science, University College London, London, UK
| | - Marianne Odlyha
- Department of Biological Sciences Birkbeck, Institute of Structural and Molecular Biology, University of London, London, UK
| | - Umber Cheema
- Division of Surgery and Interventional Science, UCL Tissue Repair and Engineering Centre, Institute of Orthopaedics and Musculoskeletal Science, University College London, London, UK
| | - Vivek Mudera
- Division of Surgery and Interventional Science, UCL Tissue Repair and Engineering Centre, Institute of Orthopaedics and Musculoskeletal Science, University College London, London, UK
| | - Laurent Bozec
- Biomaterials and Tissue Engineering, Eastman Dental Institute, University College London, London, UK
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16
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Rostgaard KR, Frederiksen RS, Liu YCC, Berthing T, Madsen MH, Holm J, Nygård J, Martinez KL. Vertical nanowire arrays as a versatile platform for protein detection and analysis. NANOSCALE 2013; 5:10226-35. [PMID: 24062006 DOI: 10.1039/c3nr03113f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Protein microarrays are valuable tools for protein assays. Reducing spot sizes from micro- to nano-scale facilitates miniaturization of platforms and consequently decreased material consumption, but faces inherent challenges in the reduction of fluorescent signals and compatibility with complex solutions. Here we show that vertical arrays of nanowires (NWs) can overcome several bottlenecks of using nanoarrays for extraction and analysis of proteins. The high aspect ratio of the NWs results in a large surface area available for protein immobilization and renders passivation of the surface between the NWs unnecessary. Fluorescence detection of proteins allows quantitative measurements and spatial resolution, enabling us to track individual NWs through several analytical steps, thereby allowing multiplexed detection of different proteins immobilized on different regions of the NW array. We use NW arrays for on-chip extraction, detection and functional analysis of proteins on a nano-scale platform that holds great promise for performing protein analysis on minute amounts of material. The demonstration made here on highly ordered arrays of indium arsenide (InAs) NWs is generic and can be extended to many high aspect ratio nanostructures.
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Affiliation(s)
- Katrine R Rostgaard
- Bio-Nanotechnology and Nanomedicine Laboratory, Department of Chemistry & Nano-Science Center, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark.
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17
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Yaari A, Posen Y, Shoseyov O. Liquid Crystalline Human Recombinant Collagen: The Challenge and the Opportunity. Tissue Eng Part A 2013; 19:1502-6. [DOI: 10.1089/ten.tea.2012.0335] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Affiliation(s)
- Amit Yaari
- The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, the Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Israel
- CollPlant Ltd., Ness-Ziona, Israel
| | | | - Oded Shoseyov
- The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, the Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Israel
- CollPlant Ltd., Ness-Ziona, Israel
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18
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Gallyamov MO, Tartsch B, Börner HG, Matyjaszewski K, Khokhlov AR, Möller M. Spreading and Dewetting of Single Bottle-Brush Macromolecules on Nanofacetted SrTiO3
Substrate as Induced by Different Vapours. MACROMOL CHEM PHYS 2013. [DOI: 10.1002/macp.201200666] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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19
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Denning D, Abu-Rub MT, Zeugolis DI, Habelitz S, Pandit A, Fertala A, Rodriguez BJ. Electromechanical properties of dried tendon and isoelectrically focused collagen hydrogels. Acta Biomater 2012; 8:3073-9. [PMID: 22522132 DOI: 10.1016/j.actbio.2012.04.017] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Revised: 03/16/2012] [Accepted: 04/10/2012] [Indexed: 11/17/2022]
Abstract
Assembling artificial collagenous tissues with structural, functional, and mechanical properties which mimic natural tissues is of vital importance for many tissue engineering applications. While the electro-mechanical properties of collagen are thought to play a role in, for example, bone formation and remodeling, this functional property has not been adequately addressed in engineered tissues. Here the electro-mechanical properties of rat tail tendon are compared with those of dried isoelectrically focused collagen hydrogels using piezoresponse force microscopy under ambient conditions. In both the natural tissue and the engineered hydrogel D-periodic type I collagen fibrils are observed, which exhibit shear piezoelectricity. While both tissues also exhibit fibrils with parallel orientations, Fourier transform analysis has revealed that the degree of parallel alignment of the fibrils in the tendon is three times that of the dried hydrogel. The results obtained demonstrate that isoelectrically focused collagen has similar structural and electro-mechanical properties to that of tendon, which is relevant for tissue engineering applications.
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Affiliation(s)
- D Denning
- Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin 4, Ireland
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20
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Taraballi F, Wang S, Li J, Lee FYY, Venkatraman SS, Birch WR, Teoh SH, Boey FYC, Ng KW. Understanding the nano-topography changes and cellular influences resulting from the surface adsorption of human hair keratins. Adv Healthc Mater 2012. [PMID: 23184785 DOI: 10.1002/adhm.201200043] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Recent interest in the use of human hair keratins as a biomaterial has grown, fuelled by improvements in keratin extraction methods and better understanding of keratin bioactivity. The use of keratins as a bioactive coating for in vitro cell culture studies is an attractive proposition. In this light, the surface adsorption of human hair keratins onto tissue culture polystyrene surfaces has been investigated. Keratin density, nano-topography and hydrophobicity of keratin coated surfaces were characterized. To understand the cellular influence of these coated surfaces, murine L929 fibroblasts were cultured on them and evaluated for cytotoxicity, proliferation, metabolic activity and detachment behaviors compared to collagen type 1 coated surfaces. Keratins were deposited up to a density of 650 ng/cm(2) when a coating concentration of 80 μg/ml or higher was used. The surface features formed by adsorbed keratins also changed in a coating concentration dependent manner. These surfaces improved L929 mouse fibroblast adhesion and proliferation in comparison to uncoated and collagen type 1 coated tissue culture polystyrene. Furthermore, the expression of fibronectin was accelerated on surfaces coated with solutions of higher keratin concentrations. These results suggest that human hair keratins can be used as a viable surface coating material to enhance substrate compliance for culturing cells.
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Affiliation(s)
- Francesca Taraballi
- School of Materials Science & Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
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21
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Dekeyser CM, Buron CC, Derclaye SR, Jonas AM, Marchand-Brynaert J, Rouxhet PG. Degradation of bare and silanized silicon wafer surfaces by constituents of biological fluids. J Colloid Interface Sci 2012; 378:77-82. [PMID: 22560491 DOI: 10.1016/j.jcis.2012.04.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Revised: 04/10/2012] [Accepted: 04/11/2012] [Indexed: 11/29/2022]
Abstract
The 24 h stability of bare silicon wafers as such or silanized with CH(3)O-(CH(2)-CH(2)-O)(n)-C(3)H(6)-trichlorosilane (n=6-9) was investigated in water, NaCl, phosphate and carbonate solutions, and in phosphate buffered saline (PBS) at 37 °C (close to biological conditions regarding temperature, high ionic strength, and pH). The resulting surfaces were analyzed using ellipsometry, X-ray Reflectometry (XRR), X-ray Photoelectron Spectroscopy (XPS), and Atomic Force Microscopy (AFM). Incubation of the silanized wafers in phosphate solution and PBS provokes a detachment of the silane layer. This is due to a hydrolysis of Si-O bonds which is favored by the action of phosphate, also responsible for a corrosion of non-silanized wafers. The surface alteration (detachment of silane layer and corrosion of the non-silanized wafer) is also important with carbonate solution, due to a higher pH (8.3). The protection of the silicon oxide layer brought by silane against the action of the salts is noticeable for phosphate but not for carbonate.
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Affiliation(s)
- C M Dekeyser
- Université catholique de Louvain, Institute of Condensed Matter and Nanosciences, Louvain-la-Neuve, Belgium
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22
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23
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Zuyderhoff EM, Dupont-Gillain CC. Nano-organized collagen layers obtained by adsorption on phase-separated polymer thin films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:2007-2014. [PMID: 22149629 DOI: 10.1021/la203842q] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The organization of adsorbed type I collagen layers was examined on a series of polystyrene (PS)/poly(methyl methacrylate) (PMMA) heterogeneous surfaces obtained by phase separation in thin films. These thin films were prepared by spin coating from solutions in either dioxane or toluene of PS and PMMA in different proportions. Their morphology was unraveled combining the information coming from X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and water contact angle measurements. Substrates with PMMA inclusions in a PS matrix and, conversely, substrates with PS inclusions in a PMMA matrix were prepared, the inclusions being either under the form of pits or islands, with diameters in the submicrometer range. The organization of collagen layers obtained by adsorption on these surfaces was then investigated. On pure PMMA, the layer was quite smooth with assemblies of a few collagen molecules, while bigger assemblies were found on pure PS. On the heterogeneous surfaces, it appeared clearly that the diameter and length of collagen assemblies was modulated by the size and surface coverage of the PS domains. If the PS domains, either surrounding or surrounded by the PMMA phase, were above 600 nm wide, a heterogeneous distribution of collagen was found, in agreement with observations made on pure polymers. Otherwise, fibrils could be formed, that were longer compared to those observed on pure polymers. Additionally, the surface nitrogen content determined by XPS, which is linked to the protein adsorbed amount, increased roughly linearly with the PS surface fraction, whatever the size of PS domains, suggesting that adsorbed collagen amount on heterogeneous PS/PMMA surfaces is a combination of that observed on the pure polymers. This work thus shows that PS/PMMA surface heterogeneities can govern collagen organization. This opens the way to a better control of collagen supramolecular organization at interfaces, which could in turn allow cell-material interactions to be tailored.
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Affiliation(s)
- Emilienne M Zuyderhoff
- Université Catholique de Louvain (UCL), Institute of Condensed Matter and Nanosciences (IMCN), Division Bio & Soft Matter (BSMA), Croix du Sud 1(L7.04.01), B-1348 Louvain-la-Neuve, Belgium
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24
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Fenoglio I, Fubini B, Ghibaudi EM, Turci F. Multiple aspects of the interaction of biomacromolecules with inorganic surfaces. Adv Drug Deliv Rev 2011; 63:1186-209. [PMID: 21871508 DOI: 10.1016/j.addr.2011.08.001] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Revised: 07/01/2011] [Accepted: 08/02/2011] [Indexed: 12/19/2022]
Abstract
The understanding of the mechanisms involved in the interaction of biological systems with inorganic materials is of interest in both fundamental and applied disciplines. The adsorption of proteins modulates the formation of biofilms onto surfaces, a process important in infections associated to medical implants, in dental caries, in environmental technologies. The interaction with biomacromolecules is crucial to determine the beneficial/adverse response of cells to foreign inorganic materials as implants, engineered or accidentally produced inorganic nanoparticles. A detailed knowledge of the surface/biological fluids interface processes is needed for the design of new biocompatible materials. Researchers involved in the different disciplines face up with similar difficulties in describing and predicting phenomena occurring at the interface between solid phases and biological fluids. This review represents an attempt to integrate the knowledge from different research areas by focussing on the search for determinants driving the interaction of inorganic surfaces with biological matter.
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25
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Tanaka Y, Baba K, Duncan TJ, Kubota A, Asahi T, Quantock AJ, Yamato M, Okano T, Nishida K. Transparent, tough collagen laminates prepared by oriented flow casting, multi-cyclic vitrification and chemical cross-linking. Biomaterials 2011; 32:3358-66. [DOI: 10.1016/j.biomaterials.2010.11.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2010] [Accepted: 11/06/2010] [Indexed: 10/18/2022]
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26
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Zhao L, Xiang R, Zhang L, Wu C, Ma R, An Y, Shi L. Micellization of copolymers via noncovalent interaction with TPPS and aggregation of TPPS. Sci China Chem 2011. [DOI: 10.1007/s11426-010-4202-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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27
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Kim DH, Lee H, Lee YK, Nam JM, Levchenko A. Biomimetic nanopatterns as enabling tools for analysis and control of live cells. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2010; 22:4551-4566. [PMID: 20803528 DOI: 10.1002/adma.201000468] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
It is becoming increasingly evident that cell biology research can be considerably advanced through the use of bioengineered tools enabled by nanoscale technologies. Recent advances in nanopatterning techniques pave the way for engineering biomaterial surfaces that control cellular interactions from the nano- to the microscale, allowing more precise quantitative experimentation capturing multi-scale aspects of complex tissue physiology in vitro. The spatially and temporally controlled display of extracellular signaling cues on nanopatterned surfaces (e. g., cues in the form of chemical ligands, controlled stiffness, texture, etc.) that can now be achieved on biologically relevant length scales is particularly attractive enabling experimental platform for investigating fundamental mechanisms of adhesion-mediated cell signaling. Here, we present an overview of bio-nanopatterning methods, with the particular focus on the recent advances on the use of nanofabrication techniques as enabling tools for studying the effects of cell adhesion and signaling on cell function. We also highlight the impact of nanoscale engineering in controlling cell-material interfaces, which can have profound implications for future development of tissue engineering and regenerative medicine.
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Affiliation(s)
- Deok-Ho Kim
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
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28
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Herzer N, Hoeppener S, Schubert US. Fabrication of patterned silane based self-assembled monolayers by photolithography and surface reactions on silicon-oxide substrates. Chem Commun (Camb) 2010; 46:5634-52. [DOI: 10.1039/c0cc00674b] [Citation(s) in RCA: 129] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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29
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Monroe MR, Li Y, Ajinkya SB, Gower LB, Douglas EP. Directed collagen patterning on gold-coated silicon substrates via micro-contact printing. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2009. [DOI: 10.1016/j.msec.2009.06.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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30
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Kumar MR, Merschrod EF, Poduska KM. Correlating mechanical properties with aggregation processes in electrochemically fabricated collagen membranes. Biomacromolecules 2009; 10:1970-5. [PMID: 19453165 DOI: 10.1021/bm900379g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We show that mechanical stiffness is a useful metric for characterizing complex collagen assemblies, providing insight about aggregation products and pathways in collagen-based materials. This study focuses on mechanically robust collagenous membranes produced by an electrochemical synthesis process. Changing the duration of the applied electric field, or adjusting the electrolyte composition (by adding Ca(2+), K(+), or Na(+) or by changing pH), produces membranes with a range of Young's moduli as determined from force-displacement measurements with an atomic force microscope. The structural organization, characterized by UV-visible spectroscopy, Raman spectroscopy, optical microscopy, and atomic force microscopy, correlates with the mechanical stiffness. These data provide insights into the relative importance of different aggregation pathways enabled by our multiparameter electrochemically induced collagen assembly process.
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Affiliation(s)
- M Ramesh Kumar
- Department of Chemistry, Memorial University of Newfoundland, St. John's, NL, A1B 3X7, Canada
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31
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Lau KHA, Bang J, Hawker CJ, Kim DH, Knoll W. Modulation of Protein−Surface Interactions on Nanopatterned Polymer Films. Biomacromolecules 2009; 10:1061-6. [DOI: 10.1021/bm801158x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. H. Aaron Lau
- Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany, Department of Chemical and Biological Engineering, Korea University, Seoul 136-701, Republic of Korea, Materials Research Laboratory, University of California at Santa Barbara, Santa Barbara, California 93106, and Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Joona Bang
- Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany, Department of Chemical and Biological Engineering, Korea University, Seoul 136-701, Republic of Korea, Materials Research Laboratory, University of California at Santa Barbara, Santa Barbara, California 93106, and Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Craig J. Hawker
- Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany, Department of Chemical and Biological Engineering, Korea University, Seoul 136-701, Republic of Korea, Materials Research Laboratory, University of California at Santa Barbara, Santa Barbara, California 93106, and Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Dong Ha Kim
- Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany, Department of Chemical and Biological Engineering, Korea University, Seoul 136-701, Republic of Korea, Materials Research Laboratory, University of California at Santa Barbara, Santa Barbara, California 93106, and Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Wolfgang Knoll
- Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany, Department of Chemical and Biological Engineering, Korea University, Seoul 136-701, Republic of Korea, Materials Research Laboratory, University of California at Santa Barbara, Santa Barbara, California 93106, and Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Republic of Korea
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32
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Kim DC, Kang DJ. Molecular Recognition and Specific Interactions for Biosensing Applications. SENSORS (BASEL, SWITZERLAND) 2008; 8:6605-6641. [PMID: 27873889 PMCID: PMC3707470 DOI: 10.3390/s8106605] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2008] [Revised: 10/16/2008] [Accepted: 10/20/2008] [Indexed: 11/24/2022]
Abstract
Molecular recognition and specific interactions are reliable and versatile routes for site-specific and well-oriented immobilization of functional biomolecules on surfaces. The control of surface properties via the molecular recognition and specific interactions at the nanoscale is a key element for the nanofabrication of biosensors with high sensitivity and specificity. This review intends to provide a comprehensive understanding of the molecular recognition- and specific interaction-mediated biosensor fabrication routes that leads to biosensors with well-ordered and controlled structures on both nanopatterned surfaces and nanomaterials. Herein self-assembly of the biomolecules via the molecular recognition and specific interactions on nanoscaled surfaces as well as nanofabrication techniques of the biomolecules for biosensor architecture are discussed. We also describe the detection of molecular recognition- and specific interaction-mediated molecular binding as well as advantages of nanoscale detection.
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Affiliation(s)
- Dong Chung Kim
- BK 21 Physics Research Division, Institute of Basic Science, SKKU Advanced Institute of Nanotechnology, Center for Nanotubes and Nanostructured Composites, Sungkyunkwan University, Suwon 440-746, Korea.
| | - Dae Joon Kang
- BK 21 Physics Research Division, Institute of Basic Science, SKKU Advanced Institute of Nanotechnology, Center for Nanotubes and Nanostructured Composites, Sungkyunkwan University, Suwon 440-746, Korea.
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33
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Al Sunaidi A. Molecular Simulation of the Adsorption of Rod/Coil Blends on Nano-Patterned Surfaces. MACROMOL THEOR SIMUL 2008. [DOI: 10.1002/mats.200800007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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34
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Kobayashi Y, Sakai M, Ueda A, Maruyama K, Saiki T, Suzuki K. Writing and reading methodology for biochips with sub-100-nm chemical patterns based on near-field scanning optical microscopy. ANAL SCI 2008; 24:571-6. [PMID: 18469460 DOI: 10.2116/analsci.24.571] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This paper demonstrates a writing and reading methodology, which allows both to create and to detect sub-100-nm carboxyl-terminated patterns on light-transmissive quartz substrates by the same instrumental system. Such a technique, capable of creating carboxyl-terminated nanopatterns, offers several benefits for the miniaturization of biochips, since the carboxyl-terminated nanopatterns allow the easy immobilization of biomolecules by amide bond formation. As a consequence, increasingly miniaturized biochips require suitable analytical methods for the detection of nanopatterns. In our approach, carboxyl-terminated nanopatterns of down to 80 nm width were created using a photolabile silane coupling agent and a UV laser coupled to a near-field scanning optical microscope (NSOM). The same NSOM system was then used in a next step to detect the fabricated carboxyl-terminated nanopatterns after modification with a fluorescent label. Furthermore, as a first step towards biochip applications, the successful immobilization of several biomolecules, such as streptavidin, IgG and DNA on carboxyl-terminated nanopatterns was demonstrated. We have shown that our approach has the potential to lead to a new bioanalytical method, which enables one to write and to read biochips on a sub-100-nm scale by the same system.
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Affiliation(s)
- Yasuhiro Kobayashi
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Yokohama, Japan
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35
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Oligo(ethylene glycol) monolayers by silanization of silicon wafers: Real nature and stability. J Colloid Interface Sci 2008; 324:118-26. [DOI: 10.1016/j.jcis.2008.05.002] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2007] [Revised: 05/01/2008] [Accepted: 05/01/2008] [Indexed: 11/21/2022]
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36
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Cheng X, Gurkan UA, Dehen CJ, Tate MP, Hillhouse HW, Simpson GJ, Akkus O. An electrochemical fabrication process for the assembly of anisotropically oriented collagen bundles. Biomaterials 2008; 29:3278-88. [DOI: 10.1016/j.biomaterials.2008.04.028] [Citation(s) in RCA: 191] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2008] [Accepted: 04/14/2008] [Indexed: 02/05/2023]
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37
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Heyen AJJV, Buron CC, Tianshi Q, Bauer R, Jonas AM, Müllen K, De Schryver FC, De Feyter S. Guiding the self-assembly of a second-generation polyphenylene dendrimer into well-defined patterns. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2008; 4:1160-1167. [PMID: 18651629 DOI: 10.1002/smll.200701009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A second-generation polyphenylene dendrimer 1 is shown to self-assemble into nanofibers. To guide the formation of the dendrimer fibers into well-defined patterns, 1H,1H,2H,2H-perfluorodecyltrichlorosilane is grafted in the gas phase onto a silicon substrate. De-wetting of the solution on the nanopatterned surface results in the formation of a nanostructured template, into which fiber growth subsequently occurs under the constraints set by the de-wetted morphology.
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Affiliation(s)
- An J J Ver Heyen
- K.U. Leuven, Department of Chemistry, Division of Molecular and Nanomaterials, and Institute for Nanoscale Physics and Chemistry, Celestijnenlaan 200F, 3001 Heverlee, Belgium
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38
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Chen Q, Xu S, Li R, Liang X, Liu H. Network structure of collagen layers absorbed on LB film. J Colloid Interface Sci 2007; 316:1-9. [PMID: 17727873 DOI: 10.1016/j.jcis.2007.07.059] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2007] [Revised: 07/19/2007] [Accepted: 07/19/2007] [Indexed: 10/23/2022]
Abstract
Elucidating the assembly mechanism of the collagen at interfaces is important. In this work, the structures of type I collagen molecules adsorbed on bare mica and on LB films of propanediyl-bis(dimethyloctadecylammonium bromide) transferred onto mica at zero surface pressure was characterized by AFM. On mica, the granular morphologies randomly distributed as elongated structures were observed, which were resulted from the interlacement of the adsorbed collagen molecules. On the LB films, the topographical evolution of the adsorbed collagen layers upon the increasing adsorption time was investigated. After 30 s, the collagen assembled into network-like structure composed of the interwoven fibrils, called as the first adlayer, which was attributed to its adsorption on the LB film by means of a limited number of contact points followed by the lateral association. One minute later, the second adlayer was observed on the top of the first adlayer. Up to 5 min, collagen layers, formed by inter-twisted fibrils, were observed. Under the same conditions after 1 min adsorption on LB film, the AFM image of the layer obtained in the diluted hydrochloric acid solution is analogous to the result of the sample dried in air, indicating that it is the LB film that leads to the formation of the network structure of collagen and the formation of the network structures of collagen layers is tentatively ascribed to the self-assembly of type I collagen molecules on LB film, not to the dewetting of the collagen solution during drying.
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Affiliation(s)
- Qibin Chen
- Lab for Advanced Material and Department of Chemistry, East China University of Science and Technology, Shanghai 200237, China
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39
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Buron CC, Callegari V, Nysten B, Jonas AM. Resistance of poly(ethylene oxide)-silane monolayers to the growth of polyelectrolyte multilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:9667-73. [PMID: 17691828 DOI: 10.1021/la701055y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The ability of poly(ethylene oxide)-silane (PEO-silane) monolayers grafted onto silicon surfaces to resist the growth of polyelectrolyte multilayers under various pH conditions is assessed for different pairs of polyelectrolytes of varying molar mass. For acidic conditions (pH 3), the PEO-silane monolayers exhibit good polyelectrolyte repellency provided the polyelectrolytes bear no moieties that are able to form hydrogen bonds with the ether groups of the PEO chains. At basic pH, PEO-silane monolayers undergo substantial hydrolysis leading to the formation of negatively charged defects in the monolayers, which then play the role of adsorption sites for the polycation. Once the polycation is adsorbed, multilayer growth ensues. Because this is defect-driven growth, the multilayer is not continuous and is made of blobs or an open network of adsorbed strands. For such conditions, the molar mass of the polyelectrolyte plays a key role, with polyelectrolyte chains of larger molar mass adsorbing on a larger number of defects, resulting in stronger anchoring of the polyelectrolyte complex on the surfaces and faster subsequent growth of the multilayer. For polyelectrolytes of sufficiently low molar mass at pH 9, the growth of the multilayer can nevertheless be prevented for as much as five cycles of deposition.
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Affiliation(s)
- Cédric C Buron
- Unité de Chimie et de Physique des Hauts Polymères (POLY), Université Catholique de Louvain, Croix du Sud 1, B-1348 Louvain-la-Neuve, Belgium (EU)
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40
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Mendes PM, Yeung CL, Preece JA. Bio-nanopatterning of Surfaces. NANOSCALE RESEARCH LETTERS 2007; 2:373-84. [PMID: 21794192 PMCID: PMC3246385 DOI: 10.1007/s11671-007-9083-3] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2007] [Accepted: 07/19/2007] [Indexed: 05/21/2023]
Abstract
Bio-nanopatterning of surfaces is a very active interdisciplinary field of research at the interface between biotechnology and nanotechnology. Precise patterning of biomolecules on surfaces with nanometre resolution has great potential in many medical and biological applications ranging from molecular diagnostics to advanced platforms for fundamental studies of molecular and cell biology. Bio-nanopatterning technology has advanced at a rapid pace in the last few years with a variety of patterning methodologies being developed for immobilising biomolecules such as DNA, peptides, proteins and viruses at the nanoscale on a broad range of substrates. In this review, the status of research and development are described, with particular focus on the recent advances on the use of nanolithographic techniques as tools for biomolecule immobilisation at the nanoscale. Present strengths and weaknesses, as well future challenges on the different nanolithographic bio-nanopatterning approaches are discussed.
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Affiliation(s)
- Paula M Mendes
- Department of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
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41
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Hung AM, Stupp SI. Simultaneous self-assembly, orientation, and patterning of peptide-amphiphile nanofibers by soft lithography. NANO LETTERS 2007; 7:1165-71. [PMID: 17447823 DOI: 10.1021/nl062835z] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Self-assembled nanofibers of peptide-amphiphile molecules have been of great interest because of their bioactivity both in vitro and in vivo. In this work, we demonstrate the simultaneous self-assembly, alignment, and patterning of these nanofibers over large areas by a novel technique termed sonication-assisted solution embossing. In this soft lithographic technique, the nanostructures self-assemble by solvent evaporation while under the influence of ultrasonic agitation and confinement within the topographical features of an elastomeric stamp. The nanofibers orient parallel to the channels as they assemble out of solution, yielding bundles of aligned nanofibers on the substrate after the stamp is removed. Alignment is likely a result of steric confinement and possibly a transition to a lyotropic liquid crystalline phase as solvent evaporates. This technique is not limited to uniaxial alignment and is shown to be able to guide nanofibers around turns. Alignment of nanostructures by this method introduces the possibility of controlling macroscale cellular behavior or material properties by tuning the directionality of interactions at the nanoscale.
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Affiliation(s)
- Albert M Hung
- Department of Materials Science and Engineering,Northwestern University, 2220 Campus Drive, Evanston, Illinois 60208-3108, USA
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42
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AlSunaidi A. Adsorption of Semiflexible Chains on Nanostriped Surfaces: Monte Carlo Simulations. MACROMOL THEOR SIMUL 2007. [DOI: 10.1002/mats.200600058] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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43
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Christman KL, Enriquez-Rios VD, Maynard HD. Nanopatterning proteins and peptides. SOFT MATTER 2006; 2:928-939. [PMID: 32680180 DOI: 10.1039/b611000b] [Citation(s) in RCA: 130] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A variety of techniques have been developed to site-specifically immobilize biomolecules onto surfaces with resolutions below one micron. The ability to pattern proteins and peptides in particular has great potential for applications in biosensors, biomaterials, and tissue engineering. For example, immobilizing proteins at the nanoscale could lead to the development of diagnostic protein nanoarrays, while patterning peptides could lead to greater control over the cell/biomaterial interface. This review discusses the methods that have been reported for patterning proteins and peptides with submicron and nanometer resolutions.
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Affiliation(s)
- Karen L Christman
- Department of Chemistry and Biochemistry, 607 Charles E. Young Drive East, Los Angles, CA 90095-1569 and California NanoSystems Institute, University of California Los Angeles, 6722 Boelter Hall, Los Angles, CA 90095-7151.
| | - Vanessa D Enriquez-Rios
- Department of Chemistry and Biochemistry, 607 Charles E. Young Drive East, Los Angles, CA 90095-1569
| | - Heather D Maynard
- Department of Chemistry and Biochemistry, 607 Charles E. Young Drive East, Los Angles, CA 90095-1569 and California NanoSystems Institute, University of California Los Angeles, 6722 Boelter Hall, Los Angles, CA 90095-7151.
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44
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Rozkiewicz DI, Kraan Y, Werten MWT, de Wolf FA, Subramaniam V, Ravoo BJ, Reinhoudt DN. Covalent Microcontact Printing of Proteins for Cell Patterning. Chemistry 2006; 12:6290-7. [PMID: 16741908 DOI: 10.1002/chem.200501554] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We describe a straightforward approach to the covalent immobilization of cytophilic proteins by microcontact printing, which can be used to pattern cells on substrates. Cytophilic proteins are printed in micropatterns on reactive self-assembled monolayers by using imine chemistry. An aldehyde-terminated monolayer on glass or on gold was obtained by the reaction between an amino-terminated monolayer and terephthaldialdehyde. The aldehyde monolayer was employed as a substrate for the direct microcontact printing of bioengineered, collagen-like proteins by using an oxidized poly(dimethylsiloxane) (PDMS) stamp. After immobilization of the proteins into adhesive "islands", the remaining areas were blocked with amino-poly(ethylene glycol), which forms a layer that is resistant to cell adhesion. Human malignant carcinoma (HeLa) cells were seeded and incubated onto the patterned substrate. It was found that these cells adhere to and spread selectively on the protein islands, and avoid the poly(ethylene glycol) (PEG) zones. These findings illustrate the importance of microcontact printing as a method for positioning proteins at surfaces and demonstrate the scope of controlled surface chemistry to direct cell adhesion.
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Affiliation(s)
- Dorota I Rozkiewicz
- Laboratory of Supramolecular Chemistry and Technology, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
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45
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Agheli H, Malmström J, Larsson EM, Textor M, Sutherland DS. Large area protein nanopatterning for biological applications. NANO LETTERS 2006; 6:1165-71. [PMID: 16771574 DOI: 10.1021/nl060403i] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Large area nanopatterns of functional proteins are demonstrated. A new approach to analyze atomic force microscopy height histograms is used to quantify protein and antibody binding to nanoscale patches. Arrays of nanopatches, each containing less than 40 laminin molecules, are shown to be highly functional binding close to 1 monoclonal anti-laminin IgG (site by IKVAV sequence) or 3-4 polyclonal anti-laminin IgG's per surface bound laminin. Complementary quartz crystal microbalance measurements indicate higher functionality at nanopatches than on homogeneous surfaces.
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Affiliation(s)
- H Agheli
- Department of Applied Physics, Chalmers University of Technology, S-41296 Göteborg, Sweden
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46
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Baralia GG, Pallandre A, Nysten B, Jonas AM. Nanopatterned self-assembled monolayers. NANOTECHNOLOGY 2006; 17:1160-1165. [PMID: 21727398 DOI: 10.1088/0957-4484/17/4/053] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We report on the fabrication of chemically nanopatterned gold surfaces by combining electron-beam lithography with gas and liquid phase thiolization. The line-edge roughness of the patterns is ∼4 nm, corresponding to a limiting feature size in the range of 15 nm. Indications for a lower packing density of the self-assembled monolayers grown in the nanofeatures are given, and evidences for the bleeding of thiols along the grain boundaries of the gold substrate are displayed. A comparison is provided between nanopatterned thiol and silane monolayers on gold and on silicon wafers, respectively. The line-edge roughnesses are shown to be close to each other for these two systems, indicating that the limiting step is currently the lithography step, suggesting possible improvement of the resolution. The advantages and drawbacks of thiol versus silane monolayers are finally discussed with respect to the formation of chemically nanopatterned surfaces.
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Affiliation(s)
- Gabriel G Baralia
- Unité de Physique et de Chimie des Hauts Polymères (POLY) and Research Center on Micro- and Nanoscopic Materials and Electronic Devices (CeRMiN), Université Catholique de Louvain, Place Croix du Sud, 1, B-1348 Louvain-la-Neuve, Belgium
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