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Panayotov IV, Végh AG, Martin M, Vladimirov B, Larroque C, Gergely C, Cuisinier FJG, Estephan E. Improving dental epithelial junction on dental implants with bioengineered peptides. Front Bioeng Biotechnol 2023; 11:1165853. [PMID: 37409165 PMCID: PMC10318435 DOI: 10.3389/fbioe.2023.1165853] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 06/12/2023] [Indexed: 07/07/2023] Open
Abstract
Introduction: The functionalization of titanium (Ti) and titanium alloys (Ti6Al4V) implant surfaces via material-specific peptides influence host/biomaterial interaction. The impact of using peptides as molecular linkers between cells and implant material to improve keratinocyte adhesion is reported. Results: The metal binding peptides (MBP-1, MBP-2) SVSVGMKPSPRP and WDPPTLKRPVSP were selected via phage display and combined with laminin-5 or E-cadherin epithelial cell specific peptides (CSP-1, CSP-2) to engineer four metal-cell specific peptides (MCSPs). Single-cell force spectroscopy and cell adhesion experiments were performed to select the most promising candidate. In vivo tests using the dental implant for rats showed that the selected bi functional peptide not only enabled stable cell adhesion on the trans-gingival part of the dental implant but also arrested the unwanted apical migration of epithelial cells. Conclusion: The results demonstrated the outstanding performance of the bioengineered peptide in improving epithelial adhesion to Ti based implants and pointed towards promising new opportunities for applications in clinical practice.
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Affiliation(s)
- Ivan V. Panayotov
- LBN, University Montpellier, Montpellier, France
- CSERD, CHU Montpellier, Montpellier, France
| | - Attila G. Végh
- Biological Research Centre, Institute of Biophysics, Eötvös Lóránd Research Network (ELKH), Szeged, Hungary
| | - Marta Martin
- L2C, University Montpellier, CNRS, Montpellier, France
| | - Boyan Vladimirov
- Department of Maxillofacial Surgery, Medical University of Plovdiv, Plovdiv, Bulgaria
| | - Christian Larroque
- Department of Nephrology, CHU Montpellier, Hôpital Lapeyronie, IRMB, University of Montpellier, INSERM U1183, Montpellier, France
| | | | | | - Elias Estephan
- LBN, University Montpellier, Montpellier, France
- Neuroscience Research Center, Faculty of Medical Sciences, Lebanese University, Beirut, Lebanon
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2
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Kruk T, Bzowska M, Hinz A, Szuwarzyński M, Szczepanowicz K. Control of Specific/Nonspecific Protein Adsorption: Functionalization of Polyelectrolyte Multilayer Films as a Potential Coating for Biosensors. MATERIALS (BASEL, SWITZERLAND) 2021; 14:7629. [PMID: 34947226 PMCID: PMC8706203 DOI: 10.3390/ma14247629] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 11/28/2021] [Accepted: 12/07/2021] [Indexed: 01/23/2023]
Abstract
Control of nonspecific/specific protein adsorption is the main goal in the design of novel biomaterials, implants, drug delivery systems, and sensors. The specific functionalization of biomaterials can be achieved by proper surface modification. One of the important strategies is covering the materials with functional coatings. Therefore, our work aimed to functionalize multilayer coating to control nonspecific/specific protein adsorption. The polyelectrolyte coating was formed using a layer-by-layer technique (LbL) with biocompatible polyelectrolytes poly-L-lysine hydrobromide (PLL) and poly-L-glutamic acid (PGA). Nonspecific protein adsorption was minimized/eliminated by pegylation of multilayer films, which was achieved by adsorption of pegylated polycations (PLL-g-PEG). The influence of poly (ethylene glycol) chain length on eliminating nonspecific protein adsorption was confirmed. Moreover, to achieve specific protein adsorption, the multilayer film was also functionalized by immobilization of antibodies via a streptavidin bridge. The functional coatings were tested, and the adsorption of the following proteins confirmed the ability to control nonspecific/specific adsorption: human serum albumin (HSA), fibrinogen (FIB), fetal bovine serum (FBS), carcinoembryonic antigen human (CEA) monitored by quartz crystal microbalance with dissipation (QCM-D). AFM imaging of unmodified and modified multilayer surfaces was also performed. Functional multilayer films are believed to have the potential as a novel platform for biotechnological applications, such as biosensors and nanocarriers for drug delivery systems.
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Affiliation(s)
- Tomasz Kruk
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, PL-30239 Krakow, Poland
| | - Monika Bzowska
- Department of Cell Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, PL-30348 Krakow, Poland; (M.B.); (A.H.)
| | - Alicja Hinz
- Department of Cell Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, PL-30348 Krakow, Poland; (M.B.); (A.H.)
| | - Michał Szuwarzyński
- Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Mickiewicza 30, PL-30059 Krakow, Poland;
| | - Krzysztof Szczepanowicz
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, PL-30239 Krakow, Poland
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Gnanasampanthan T, Beyer CD, Yu W, Karthäuser JF, Wanka R, Spöllmann S, Becker HW, Aldred N, Clare AS, Rosenhahn A. Effect of Multilayer Termination on Nonspecific Protein Adsorption and Antifouling Activity of Alginate-Based Layer-by-Layer Coatings. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:5950-5963. [PMID: 33969986 DOI: 10.1021/acs.langmuir.1c00491] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Layer-by-layer (LbL) assembly is a versatile platform for applying coatings and studying the properties of promising compounds for antifouling applications. Here, alginate-based LbL coatings were fabricated by alternating the deposition of alginic acid and chitosan or polyethylenimine to form multilayer coatings. Films were prepared with either odd or even bilayer numbers to investigate if the termination of the LbL coatings affects the physicochemical properties, resistance against the nonspecific adsorption (NSA) of proteins, and antifouling efficacy. The hydrophilic films, which were characterized using spectroscopic ellipsometry, water contact angle goniometry, ATR-FTIR spectroscopy, AFM, XPS, and SPR spectroscopy, revealed high swelling in water and strongly reduced the NSA of proteins compared to the hydrophobic reference. While the choice of the polycation was important for the protein resistance of the LbL coatings, the termination mattered less. The attachment of diatoms and settling of barnacle cypris larvae revealed good antifouling properties that were controlled by the termination and the charge density of the LbL films.
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Affiliation(s)
| | | | | | | | | | | | | | - Nick Aldred
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom
- School of Life Sciences, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, United Kingdom
| | - Anthony S Clare
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom
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4
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Zhang X, Gao X, Zhou J, Gao Z, Tang Y, Tian Z, Ning P, Xia Y. Albumin-based fluorescence resonance energy transfer nanoprobes for multileveled tumor tissue imaging and dye release imaging. Colloids Surf B Biointerfaces 2020; 199:111537. [PMID: 33385821 DOI: 10.1016/j.colsurfb.2020.111537] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2020] [Revised: 11/19/2020] [Accepted: 12/12/2020] [Indexed: 12/17/2022]
Abstract
Tumor tissue imaging and drug release imaging are both crucial for tumor imaging and image-guided drug delivery. It is urgent to develop a multileveled tumor imaging platform to realize the multiple imaging applications. In this work, we synthesized an albumin-based fluorescence resonance energy transfer (FRET) probe Cy5/7@HSA NPs containing two near-infrared cyanine dyes (CyBI5 and CyBI7) with high FRET efficiency (97 %). Excellent brightness and efficient FRET inside Cy5/7@HSA NPs enabled high-sensitive cell imaging and tumor imaging. This unique nanoprobe imaged 4T1 tumor-bearing mice with high sensitivity (TBR = 5.2) at 24 h post-injection and the dyes penetrated the tumor interior around 4 h post-injection. The release of dyes from nanoprobes was also tracked. This result shows the strong potential of this albumin-based FRET nanoprobe as multileveled tumor imaging platform for in vivo tumor imaging, drug delivery and image-guided surgery.
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Affiliation(s)
- Xianghan Zhang
- Engineering Research Center of Molecular-imaging and Neuro-imaging of Ministry of Education, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi 710026, China
| | - Xiaohan Gao
- Engineering Research Center of Molecular-imaging and Neuro-imaging of Ministry of Education, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi 710026, China
| | - Jialin Zhou
- Engineering Research Center of Molecular-imaging and Neuro-imaging of Ministry of Education, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi 710026, China
| | - Zhiqing Gao
- Engineering Research Center of Molecular-imaging and Neuro-imaging of Ministry of Education, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi 710026, China
| | - Yingdi Tang
- Engineering Research Center of Molecular-imaging and Neuro-imaging of Ministry of Education, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi 710026, China
| | - Zuhong Tian
- Institute of Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, China
| | - Pengbo Ning
- Engineering Research Center of Molecular-imaging and Neuro-imaging of Ministry of Education, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi 710026, China
| | - Yuqiong Xia
- Engineering Research Center of Molecular-imaging and Neuro-imaging of Ministry of Education, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi 710026, China.
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5
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Markovic MD, Spasojevic PM, Seslija SI, Popovic IG, Veljovic DN, Pjanovic RV, Panic VV. Casein-poly(methacrylic acid) hybrid soft networks with easy tunable properties. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.01.065] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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6
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Shutava TG, Livanovich KS, Sharamet AA. Layer-by-layer films of polysaccharides modified with polyethylene glycol and dextran. Colloids Surf B Biointerfaces 2018; 173:412-420. [PMID: 30321799 DOI: 10.1016/j.colsurfb.2018.10.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 09/07/2018] [Accepted: 10/04/2018] [Indexed: 01/18/2023]
Abstract
Layer-by-layer (LbL) films with enhanced resistance to protein adsorption were obtained on the basis of N-grafted copolymers of chitosan with polyethylene glycol (PEG) or dextran (DEX). The copolymers with the backbone molecular weight of 18 and 450 kDa, side chains of PEG of 5.0 and 0.9 kDa, DEX of 6.0 kDa and the degree of amine groups substitution χSub as high as ∼0.25 were alternated with dextran sulfate (DS) to assemble up to 10 bilayer films. The film material contains 85±5% of water with virtually no effect of the copolymer structure. By utilizing the graft copolymers and applying suitable number of copolymer/DS bilayers to the surface, the mass of adsorbed fetal bovine serum proteins was decreased by 70-85% as compared to that on unmodified chitosan/DS film. In terms of overlapping side chains on the LbL surface the copolymers of PEG and DEX are equally effective in tailoring protein-resistant materials.
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Affiliation(s)
- Tatsiana G Shutava
- Institute of Chemistry of New Materials, National Academy of Sciences of Belarus, Minsk, Belarus.
| | - Kanstantsin S Livanovich
- Institute of Chemistry of New Materials, National Academy of Sciences of Belarus, Minsk, Belarus
| | - Anastasiya A Sharamet
- Institute of Chemistry of New Materials, National Academy of Sciences of Belarus, Minsk, Belarus
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7
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Vander Straeten A, Bratek-Skicki A, Jonas AM, Fustin CA, Dupont-Gillain C. Integrating Proteins in Layer-by-Layer Assemblies Independently of their Electrical Charge. ACS NANO 2018; 12:8372-8381. [PMID: 29965727 DOI: 10.1021/acsnano.8b03710] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Layer-by-layer (LbL) assembly is an attractive method for protein immobilization at interfaces, a much wanted step for biotechnologies and biomedicine. Integrating proteins in LbL thin films is however very challenging due to their low conformational entropy, heterogeneous spatial distribution of charges, and polyampholyte nature. Protein-polyelectrolyte complexes (PPCs) are promising building blocks for LbL construction owing to their standardized charge and polyelectrolyte (PE) corona. In this work, lysozyme was complexed with poly(styrenesulfonate) (PSS) at different ionic strengths and pH values. The PPCs size and electrical properties were investigated, and the forces driving complexation were elucidated, in the light of computations of polyelectrolyte conformation, with a view to further unravel LbL construction mechanisms. Quartz crystal microbalance and atomic force microscopy were used to monitor the integration of PPCs compared to the one of bare protein molecules in LbL assemblies, and colorimetric assays were performed to determine the protein amount in the thin films. Layers built with PPCs show higher protein contents and hydration levels. Very importantly, the results also show that LbL construction with PPCs mainly relies on standard PE-PE interactions, independent of the charge state of the protein, in contrast to classical bare protein assembly with PEs. This considerably simplifies the incorporation of proteins in multilayers, which will be beneficial for biosensing, heterogeneous biocatalysis, biotechnologies, and medical applications that require active proteins at interfaces.
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Affiliation(s)
- Aurélien Vander Straeten
- Institute of Condensed Matter and Nanosciences , Université catholique de Louvain , Place Louis Pasteur, 1 bte L4.01.10 , B-1348 Louvain-la-Neuve , Belgium
| | - Anna Bratek-Skicki
- Institute of Condensed Matter and Nanosciences , Université catholique de Louvain , Place Louis Pasteur, 1 bte L4.01.10 , B-1348 Louvain-la-Neuve , Belgium
| | - Alain M Jonas
- Institute of Condensed Matter and Nanosciences , Université catholique de Louvain , Place Louis Pasteur, 1 bte L4.01.10 , B-1348 Louvain-la-Neuve , Belgium
| | - Charles-André Fustin
- Institute of Condensed Matter and Nanosciences , 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 , Université catholique de Louvain , Place Louis Pasteur, 1 bte L4.01.10 , B-1348 Louvain-la-Neuve , Belgium
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8
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Szczepanowicz K, Kruk T, Świątek W, Bouzga AM, Simon CR, Warszyński P. Poly(l-glutamic acid)-g-poly(ethylene glycol) external layer in polyelectrolyte multilayer films: Characterization and resistance to serum protein adsorption. Colloids Surf B Biointerfaces 2018; 166:295-302. [PMID: 29604572 DOI: 10.1016/j.colsurfb.2018.03.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Revised: 03/06/2018] [Accepted: 03/17/2018] [Indexed: 11/28/2022]
Abstract
Formation of protein-resistant surfaces is a major challenge in the design of novel biomaterials and an important strategy to prevent protein adsorption is the formation of protein-resistant coatings. It can be achieved by proper modification of surfaces, e.g., by immobilization of hydrophilic polymers such as poly(ethylene glycol) (PEG). An appropriate method to immobilize PEG at charged surfaces is the adsorption of copolymers with PEG chains grafted onto polyelectrolyte backbone. The growing interest in the use of polyelectrolyte multilayer coatings in biomedical applications to improve biocompatibility and/or to prepare coating with antiadhesive properties has been the main reason for these studies. Therefore the aim was to produce protein resistant polyelectrolyte multilayer films. They were formed via the layer-by-layer approach, while their pegylation by the deposition of pegylated polyanion, PGA-g-PEG, as an external layer. The influence of PEG chain length and grafting density of PGA-g-PEG copolymers on the protein antiadhesive properties of pegylated polyelectrolyte multilayer films was investigated. To monitor the formation of pegylated and non-pegylated multilayer films, adsorption of the following proteins: HSA, Fibrinogen, and FBS were measured by quartz crystal microbalance (QCM - D). We found that protein adsorption onto all pegylated polyelectrolyte multilayers was significantly reduced in comparison to non-pegylated ones. Long-term performance tests confirmed the stability and the durability of the protein resistant properties of the pegylated multilayers. Antiadhesive properties of tested surfaces pegylated by PGA-g-PEG were compared to the available data for pegylated polycation PLL-g-PEG.
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Affiliation(s)
- Krzysztof Szczepanowicz
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, PL-30239 Krakow, Poland.
| | - Tomasz Kruk
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, PL-30239 Krakow, Poland
| | - Wiktoria Świątek
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, PL-30239 Krakow, Poland
| | - Aud M Bouzga
- SINTEF Material and Chemistry, Forskningsveien 1, N-0314 Oslo, Norway
| | - Christian R Simon
- SINTEF Material and Chemistry, Forskningsveien 1, N-0314 Oslo, Norway
| | - Piotr Warszyński
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, PL-30239 Krakow, Poland
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9
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KUMOREK M, KUBIES D, RIEDEL T. Protein Interactions With Quaternized Chitosan/Heparin Multilayers. Physiol Res 2016; 65:S253-S261. [DOI: 10.33549/physiolres.933427] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Understanding the behavior of single proteins at the polyelectrolyte multilayer film/solution interface is of prime importance for the designing of bio-functionalized surface coatings. In the present paper, we study the adsorption of the model proteins, albumin and lysozyme, as well as basic fibroblast growth factor (FGF-2) on a polysaccharide multilayer film composed of quaternized chitosan and heparin. Several analytical methods were used to describe the formation of the polysaccharide film and its interactions with the proteins. Both albumin and lysozyme adsorbed on quaternized chitosan/heparin films, however this process strongly depended on the terminating polysaccharide. Protein adsorption was driven mainly by electrostatic interactions between protein and the terminal layer of the film. The effective binding of FGF-2 by the heparin-terminated film suggested that other interactions could also contribute to the adsorption process. We believe that this FGF-2-presenting polysaccharide film may serve as a biofunctional surface coating for biologically-related applications.
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Affiliation(s)
- M. KUMOREK
- Department of Bioactive Polymers, Institute of Macromolecular Chemistry of the Czech Academy of Sciences, Prague, Czech Republic
| | - D. KUBIES
- Department of Bioactive Polymers, Institute of Macromolecular Chemistry of the Czech Academy of Sciences, Prague, Czech Republic
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10
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Štajner L, Požar J, Kovačević D. Complexation between lysozyme and sodium poly(styrenesulfonate): The effect of pH, reactant concentration and titration direction. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.03.034] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Bacterial protease triggered release of biocides from microspheres with an oily core. Colloids Surf B Biointerfaces 2015; 127:200-5. [DOI: 10.1016/j.colsurfb.2015.01.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 01/13/2015] [Accepted: 01/21/2015] [Indexed: 12/17/2022]
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12
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Díez-Pascual AM, Shuttleworth PS. Layer-by-Layer Assembly of Biopolyelectrolytes onto Thermo/pH-Responsive Micro/Nano-Gels. MATERIALS (BASEL, SWITZERLAND) 2014; 7:7472-7512. [PMID: 28788259 PMCID: PMC5512647 DOI: 10.3390/ma7117472] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Revised: 11/01/2014] [Accepted: 11/14/2014] [Indexed: 01/25/2023]
Abstract
This review deals with the layer-by-layer (LbL) assembly of polyelectrolyte multilayers of biopolymers, polypeptides (i.e., poly-l-lysine/poly-l-glutamic acid) and polysaccharides (i.e., chitosan/dextran sulphate/sodium alginate), onto thermo- and/or pH-responsive micro- and nano-gels such as those based on synthetic poly(N-isopropylacrylamide) (PNIPAM) and poly(acrylic acid) (PAA) or biodegradable hyaluronic acid (HA) and dextran-hydroxyethyl methacrylate (DEX-HEMA). The synthesis of the ensembles and their characterization by way of various techniques is described. The morphology, hydrodynamic size, surface charge density, bilayer thickness, stability over time and mechanical properties of the systems are discussed. Further, the mechanisms of interaction between biopolymers and gels are analysed. Results demonstrate that the structure and properties of biocompatible multilayer films can be finely tuned by confinement onto stimuli-responsive gels, which thus provides new perspectives for biomedical applications, particularly in the controlled release of biomolecules, bio-sensors, gene delivery, tissue engineering and storage.
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Affiliation(s)
- Ana M Díez-Pascual
- Analytical Chemistry, Physical Chemistry and Chemical Engineering Department, Faculty of Biology, Environmental Sciences and Chemistry, Alcalá University, 28871 Alcalá de Henares, Madrid, Spain.
| | - Peter S Shuttleworth
- Instituto de Ciencia y Tecnología de Polímeros-Consejo Superior de Investigaciones Científicas, Juan de la Cierva 3, 28006 Madrid, Spain.
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13
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14
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Wu B, Liu G, Zhang G, Craig VSJ. Stiff chains inhibit and flexible chains promote protein adsorption to polyelectrolyte multilayers. SOFT MATTER 2014; 10:3806-3816. [PMID: 24718871 DOI: 10.1039/c4sm00413b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We tested the hypothesis that the level of protein adsorption onto polyelectrolyte multilayers (PEMs) is influenced by the chain stiffness of the polymers forming the multilayer. The implication being that by altering the chain stiffness, PEMs can be formed that promote or inhibit protein adsorption. Protein adsorption to PEMs consisting of flexible and semi-flexible polyelectrolytes was investigated. The flexible polyelectrolytes were poly(sodium 4-styrene sulfonate) (PSS) and poly(diallyldimethylammonium chloride) (PDDA) and the semi-flexible polyelectrolytes were sulfated chitosan (SC) and cationic guar gum (CGG). Polyelectrolytes were used in pairs to produce four types of polyelectrolyte multilayer films. Moreover, each of these films could be terminated with either of the polyelectrolytes resulting in protein adsorption being studied on 8 systems. Protein adsorption was investigated by optical reflectometry and quartz crystal microbalance with dissipation using bovine serum albumin as the test protein. We found that when a pair of semi-flexible polyelectrolytes was used very little protein adsorption took place, irrespective of which polyelectrolyte was used to terminate the film. When the film was formed by flexible polyelectrolytes, significant protein adsorption took place and the degree of adsorption depended strongly on which polyelectrolyte was used to terminate the film. We explain these observations by considering the conformation of the polyelectrolyte in the outermost region of the film and relate this to the flexibility of the polyelectrolyte chains employed to produce the polyelectrolyte multilayer.
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Affiliation(s)
- Bo Wu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, P. R. China.
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15
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Polypeptide multilayer self-assembly studied by ellipsometry. JOURNAL OF DRUG DELIVERY 2014; 2014:424697. [PMID: 24660065 PMCID: PMC3934801 DOI: 10.1155/2014/424697] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Revised: 12/21/2013] [Accepted: 12/31/2013] [Indexed: 12/04/2022]
Abstract
A polypeptide nanofilm made by layer-by-layer (LbL) self-assembly was built on a surface that mimics nonwoven, a material commonly used in wound dressings. Poly-L-lysine (PLL) and poly-L-glutamic acid (PLGA) are the building blocks of the nanofilm, which is intended as an enzymatically degradable lid for release of bactericides to chronic wounds. Chronic wounds often carry infection originating from bacteria such as Staphylococcus aureus and a release system triggered by the degree of infection is of interest. The dry nanofilm was studied with ellipsometry. The thickness of the nanofilm was 60% less in its dry state than in its wet state. The measurements showed that a primer was not necessary to build a stable nanofilm, which is practically important in our case because a nondegradable primer is highly unwanted in a wound care dressing. Added V8 (glutamyl endopeptidase) enzymes only showed adsorption on the nanofilm at room temperature, indicating that the PLL/PLGA “lid” may remain intact until the dressing has been filled with wound exudate at the elevated temperature typical of that of the wound.
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16
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Cho Y, Lee JB, Hong J. Controlled release of an anti-cancer drug from DNA structured nano-films. Sci Rep 2014; 4:4078. [PMID: 24518218 PMCID: PMC3921640 DOI: 10.1038/srep04078] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Accepted: 01/28/2014] [Indexed: 12/12/2022] Open
Abstract
We demonstrate the generation of systemically releasable anti-cancer drugs from multilayer nanofilms. Nanofilms designed to drug release profiles in programmable fashion are promising new and alternative way for drug delivery. For the nanofilm structure, we synthesized various unique 3-dimensional anti cancer drug incorporated DNA origami structures (hairpin, Y, and X shaped) and assembled with peptide via layer-by-layer (LbL) deposition method. The key to the successful application of these nanofilms requires a novel approach of the influence of DNA architecture for the drug release from functional nano-sized surface. Herein, we have taken first steps in building and controlling the drug incorporated DNA origami based multilayered nanostructure. Our finding highlights the novel and unique drug release character of LbL systems in serum condition taken full advantages of DNA origami structure. This multilayer thin film dramatically affects not only the release profiles but also the structure stability in protein rich serum condition.
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Affiliation(s)
- Younghyun Cho
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA 30332, USA
- These authors are equally contributed to this work
| | - Jong Bum Lee
- Department of Chemical Engineering, University of Seoul, Seoul 130-743, Republic of Korea
- These authors are equally contributed to this work
| | - Jinkee Hong
- School of Chemical Engineering and Materials Science, Chung-Ang University, Seoul 156-756, Republic of Korea
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Lee JH, Hwang HJ, Bhak G, Jang Y, Paik SR, Char K. In Situ Fibril Formation of κ-Casein by External Stimuli within Multilayer Thin Films. ACS Macro Lett 2013; 2:688-693. [PMID: 35606953 DOI: 10.1021/mz400276f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We have developed the in situ fibrillation of κ-casein, employed as amyloid precursor, within multilayer films consisting of κ-casein and poly(acrylic acid) (PAA) prepared by the layer-by-layer (LbL) deposition. The fibrillation of κ-casein within the multilayered films is strongly dependent on the extent of intermolecular interactions between κ-casein and PAA. When films constructed initially at pH 3 were heat treated at the same pH, κ-casein did not transform into fibrils. However, when the films were subjected to heat treatment at pH 5, κ-casein was transformed into fibrils within multilayer films due to weakened intermolecular interactions between κ-casein and PAA. We also noted that the multilayer film was swollen at pH 5 by the charge imbalance within the film, which we believe gives enough mobility for κ-caseins to form fibrils with adjacent κ-caseins within the multilayer. The fibrils were found to be uniformly distributed across the entire film thickness, and the aspect ratio as well as the number density of fibrils increased as a function of incubation time. The present study reveals a strategy to realize in situ nanocomposites within LbL multilayer films simply by triggering the formation of protein fibrils by controlling the intermolecular interactions between amyloid precursors and polyelectrolytes (PEs).
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Affiliation(s)
- Ji-Hye Lee
- The National Creative Research Initiative Center for Intelligent Hybrids, The WCU Program of Chemical Convergence for Energy & Environment, and ‡School of Chemical & Biological Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
| | - Hyun Joo Hwang
- The National Creative Research Initiative Center for Intelligent Hybrids, The WCU Program of Chemical Convergence for Energy & Environment, and ‡School of Chemical & Biological Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
| | - Ghibom Bhak
- The National Creative Research Initiative Center for Intelligent Hybrids, The WCU Program of Chemical Convergence for Energy & Environment, and ‡School of Chemical & Biological Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
| | - Yeongseon Jang
- The National Creative Research Initiative Center for Intelligent Hybrids, The WCU Program of Chemical Convergence for Energy & Environment, and ‡School of Chemical & Biological Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
| | - Seung R. Paik
- The National Creative Research Initiative Center for Intelligent Hybrids, The WCU Program of Chemical Convergence for Energy & Environment, and ‡School of Chemical & Biological Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
| | - Kookheon Char
- The National Creative Research Initiative Center for Intelligent Hybrids, The WCU Program of Chemical Convergence for Energy & Environment, and ‡School of Chemical & Biological Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
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18
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Costa RR, Testera AM, Arias FJ, Rodríguez-Cabello JC, Mano JF. Layer-by-layer film growth using polysaccharides and recombinant polypeptides: a combinatorial approach. J Phys Chem B 2013; 117:6839-48. [PMID: 23662646 DOI: 10.1021/jp4028518] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Nanostructured films consisting of polysaccharides and elastin-like recombinamers (ELRs) are fabricated in a layer-by-layer manner. A quartz-crystal microbalance with dissipation monitoring (QCM-D) is used to follow the buildup of hybrid films containing one polysaccharide (chitosan or alginate) and one of several ELRs that differ in terms of amino acid content, length, and biofunctionality in situ at pH 4.0 and pH 5.5. The charge density of the ingredients at each pH is determined by measuring their ζ-potential, and the thickness of a total of 36 different films containing five bilayers is estimated using the Voigt-based viscoelastic model. A comparison of the values obtained reveals that thicker films can be obtained when working at a pH close to the acidity constant of the polysaccharide used (near-pKa conditions), suggesting that the construction of such films is more favorable when based on the presence of hydrophobic interactions between ELRs and partially neutralized polysaccharides. Further analysis shows that the molecular weight of the ELRs plays only a minor role in defining the growth tendency. When taken together, these results point to the most favorable conditions for constructing nanostructured films from natural and distinct recombinant polypeptides that can be tuned to exhibit specialized biofunctionality for tissue-engineering, drug-delivery, and biotechnological applications.
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Affiliation(s)
- Rui R Costa
- University of Minho, 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Avepark, 4806-909 Caldas das Taipas, Guimarães, Portugal
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19
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Ma Y, Dong J, Bhattacharjee S, Wijeratne S, Bruening ML, Baker GL. Increased protein sorption in poly(acrylic acid)-containing films through incorporation of comb-like polymers and film adsorption at low pH and high ionic strength. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:2946-54. [PMID: 23351043 PMCID: PMC3727236 DOI: 10.1021/la305137m] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
In principle, incorporation of comb-like block copolymers in multilayer polyelectrolyte films can both increase film thickness relative to coatings containing linear polymers and provide more swollen films for increased sorption of proteins. In the absence of added salt, alternating adsorption of 5 bilayers of protonated poly(allylamine) (PAH) and comb-like poly(2-hydroxyethyl methacrylate)-graft-poly(acrylic acid) (PHEMA-g-PAA) leads to ∼2-fold thicker coatings than adsorption of PAH and linear PAA, and the difference in the thicknesses of the two coatings increases with the number of bilayers. Moreover, the (PAH/PHEMA-g-PAA)n films sorb 2- to 4-fold more protein than corresponding films prepared with linear PAA, and coatings deposited at pH 3.0 sorb more protein than coatings adsorbed at pH 5.0, 7.0, or 9.0. In fact changes in deposition pH and addition of 0.5 M NaCl to polyelectrolyte adsorption solutions alter protein sorption more dramatically than variations in the constituent polymer architecture. When deposited from 0.5 M NaCl at pH 3.0, both (PAH/PHEMA-g-PAA)5 and (PAH/PAA)5 films increase in thickness more than 400% upon adsorption of lysozyme. These films contain a high concentration of free -COOH groups, and subsequent deprotonation of these groups at neutral pH likely contributes to increased protein binding. Lysozyme sorption stabilizes these films, as without lysozyme films deposited at pH 3.0 from 0.5 M NaCl desorb at neutral pH. Films deposited at pH 9.0 from 0.5 M NaCl are more stable and also bind large amounts of lysozyme. The high binding capacities of these films make them attractive for potential applications in protein isolation or immobilization of enzymes.
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Affiliation(s)
| | | | | | - Salinda Wijeratne
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - Merlin L. Bruening
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
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20
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Gao W, Feng B, Lu X, Wang J, Qu S, Weng J. Characterization and cell behavior of titanium surfaces with PLL/DNA modification via a layer-by-layer technique. J Biomed Mater Res A 2012; 100:2176-85. [DOI: 10.1002/jbm.a.33238] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Revised: 08/19/2011] [Accepted: 08/19/2011] [Indexed: 11/11/2022]
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21
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Goli KK, Rojas OJ, Özçam AE, Genzer J. Generation of Functional Coatings on Hydrophobic Surfaces through Deposition of Denatured Proteins Followed by Grafting from Polymerization. Biomacromolecules 2012; 13:1371-82. [DOI: 10.1021/bm300075u] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kiran K. Goli
- Department of Materials
Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695-7907,
United States
| | - Orlando J. Rojas
- Department of Forest
Biomaterials, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
- Department of Forest
Products Technology, Aalto University, FI-00076 Aalto, Espoo, Finland
| | - A. Evren Özçam
- Department of Chemical
and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905,
United States
| | - Jan Genzer
- Department of Chemical
and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905,
United States
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22
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Gribova V, Auzely-Velty R, Picart C. Polyelectrolyte Multilayer Assemblies on Materials Surfaces: From Cell Adhesion to Tissue Engineering. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2012; 24:854-869. [PMID: 25076811 PMCID: PMC4112380 DOI: 10.1021/cm2032459] [Citation(s) in RCA: 231] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Controlling the bulk and surface properties of materials is a real challenge for bioengineers working in the fields of biomaterials, tissue engineering and biophysics. The layer-by-layer (LbL) deposition method, introduced 20 years ago, consists in the alternate adsorption of polyelectrolytes that self-organize on the material's surface, leading to the formation of polyelectrolyte multilayer (PEM) films.1 Because of its simplicity and versatility, the procedure has led to considerable developments of biological applications within the past 5 years. In this review, we focus our attention on the design of PEM films as surface coatings for applications in the field of physical properties that have emerged as being key points in relation to biological processes. The numerous possibilities for adjusting the chemical, physical, and mechanical properties of PEM films have fostered studies on the influence of these parameters on cellular behaviors. Importantly, PEM have emerged as a powerful tool for the immobilization of biomolecules with preserved bioactivity.
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Affiliation(s)
- Varvara Gribova
- LMGP-MINATEC, Grenoble Institute of Technology, 3 Parvis Louis Néel, 38016 Grenoble, France
- Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), affiliated with University Joseph Fourier, and member of the Institut de Chimie Moléculaire de Grenoble, France
| | - Rachel Auzely-Velty
- Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), affiliated with University Joseph Fourier, and member of the Institut de Chimie Moléculaire de Grenoble, France
| | - Catherine Picart
- LMGP-MINATEC, Grenoble Institute of Technology, 3 Parvis Louis Néel, 38016 Grenoble, France
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23
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Composite multilayer thin films morphology and their interactions with proteins as a function of polyanion structure. Macromol Res 2011. [DOI: 10.1007/s13233-011-1010-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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24
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de Villiers MM, Otto DP, Strydom SJ, Lvov YM. Introduction to nanocoatings produced by layer-by-layer (LbL) self-assembly. Adv Drug Deliv Rev 2011; 63:701-15. [PMID: 21699936 DOI: 10.1016/j.addr.2011.05.011] [Citation(s) in RCA: 225] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Revised: 04/11/2011] [Accepted: 05/16/2011] [Indexed: 10/18/2022]
Abstract
Studies on the adsorption of oppositely charged colloidal particles ultimately resulted in multilayered polyelectrolyte self-assembly. The inception of layer-by-layer constructed particles facilitated the production of multifunctional, stimuli-responsive carrier systems. An array of synthetic and natural polyelectrolytes, metal oxides and clay nanoparticles is available for the construction of multilayered nanocoats on a multitude of substrates or removable cores. Numerous substrates can be encapsulated utilizing this technique including dyes, enzymes, drugs and cells. Furthermore, the outer surface of the particles presents and ideal platform that can be functionalized with targeting molecules or catalysts. Some processing parameters determining the properties of these successive self-assembly constructs are the surface charge density, coating material concentration, rinsing and drying steps, temperature and ionic strength of the medium. Additionally, the simplicity of the layer-by-layer assembly technique and the availability of established characterization methods, render these constructs extremely versatile in applications of sensing, encapsulation and target- and trigger-responsive drug delivery.
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25
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Lavalle P, Voegel JC, Vautier D, Senger B, Schaaf P, Ball V. Dynamic aspects of films prepared by a sequential deposition of species: perspectives for smart and responsive materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:1191-221. [PMID: 21264957 DOI: 10.1002/adma.201003309] [Citation(s) in RCA: 161] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2010] [Revised: 10/26/2010] [Indexed: 05/23/2023]
Abstract
The deposition of surface coatings using a step-by-step approach from mutually interacting species allows the fabrication of so called "multilayered films". These coatings are very versatile and easy to produce in environmentally friendly conditions, mostly from aqueous solution. They find more and more applications in many hot topic areas, such as in biomaterials and nanoelectronics but also in stimuli-responsive films. We aim to review the most recent developments in such stimuli-responsive coatings based on layer-by-layer (LBL) depositions in relationship to the properties of these coatings. The most investigated stimuli are based on changes in ionic strength, temperature, exposure to light, and mechanical forces. The possibility to induce a transition from linear to exponential growth in thickness and to change the charge compensation from "intrinsic" to "extrinsic" by controlling parameters such as temperature, pH, and ionic strength are the ways to confer their responsiveness to the films. Chemical post-modifications also allow to significantly modify the film properties.
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Affiliation(s)
- Philippe Lavalle
- Institut National de la Santé et de la Recherche Médicale, Unité 977, 11 rue Humann, Strasbourg Cedex, France
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26
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Yu Q, Chen H, Zhang Y, Yuan L, Zhao T, Li X, Wang H. pH-reversible, high-capacity binding of proteins on a substrate with nanostructure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:17812-17815. [PMID: 21038872 DOI: 10.1021/la103647s] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
In this letter, a pH-switchable system for protein adsorption and release is introduced. By combining the pH sensitivity of poly(methacrylic acid) (poly(MAA) chains and the nanoeffects of 3D nanostructured silicon nanowire arrays (SiNWAs), a poly(MAA)-modified SiNWAs material showed an extremely high capacity for binding lysozyme at pH 4 (an ∼80-fold increase compared with that of smooth Si-poly(MAA)). Moreover, ∼90% of the adsorbed lysozyme was released from SiNWAs-poly(MAA) by increasing the pH from 4 to 9, without a loss of enzyme activity.
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Affiliation(s)
- Qian Yu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China
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27
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Martins GV, Merino EG, Mano JF, Alves NM. Crosslink effect and albumin adsorption onto chitosan/alginate multilayered systems: an in situ QCM-D study. Macromol Biosci 2010; 10:1444-55. [PMID: 21125694 DOI: 10.1002/mabi.201000193] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2010] [Revised: 07/13/2010] [Indexed: 12/12/2022]
Abstract
The adsorption of HSA onto CHI/ALG multilayer assemblies was assessed in situ using QCM-D. It was found that the behavior of HSA on biomaterials surface can be tuned by adjusting parameters of the polyelectrolyte system such as pH, layer number, crosslinker and polymer terminal layer. Our results confirmed the key role of electrostatic interactions during HSA adsorption, since oppositely charged surfaces were more effective in promoting protein adhesion. QCM-D data revealed that crosslinking (CHI/ALG)(5) CHI films allows HSA to become adsorbed in physiological conditions. Our results suggested that the biological potential of biopolymers and the mild conditions of the LbL technique turn these natural nanoassemblies into a suitable choice to be used as pH-sensitive coatings.
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Affiliation(s)
- Gabriela V Martins
- Department of Polymer Engineering, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal.
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28
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Silva RA, Urzúa MD, Petri DFS, Dubin PL. Protein adsorption onto polyelectrolyte layers: effects of protein hydrophobicity and charge anisotropy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:14032-14038. [PMID: 20672852 DOI: 10.1021/la102254g] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Ellipsometry was used to investigate the influence of ionic strength (I) and pH on the adsorption of bovine serum albumin (BSA) or beta-lactoglobulin (BLG) onto preabsorbed layers of two polycations: poly(diallyldimethylammonium chloride) (PDADMAC) or poly(4-vinylpyridine bromide) quaternized with linear aliphatic chains of two (QPVP-C2) or five (QPVP-C5) carbons. Comparisons among results for the three polycations reveal hydrophobic interactions, while comparisons between BSA and BLG-proteins of very similar isoelectric points (pI)-indicate the importance of protein charge anisotropy. At pH close to pI, the ionic strength dependence of the adsorbed amount of protein (Gamma) displayed maxima in the range 10 < I < 25 mM corresponding to Debye lengths close to the protein radii. Visualization of protein charge by Delphi suggested that these ionic strength conditions corresponded to suppression of long-range repulsion between polycations and protein positive domains, without diminution of short-range attraction between polycation segments and locally negative protein domains, in a manner similar to the behavior of PE-protein complexes in solution. (1-4) This description was consistent with the disappearance of the maxima at pH either above or below pI. In the former case, Gamma values decrease exponentially with I(1/2), due to screening of attractions, while in the latter case adsorption of both proteins decreased at low I due to strong repulsion. Close to or below pI both proteins adsorbed more strongly onto QPVP-C5 than onto QPVP-C2 or PDADMAC due to hydrophobic interactions with the longer alkyl group. Above pI, the adsorption was more pronounced with PDADMAC because these chains may assume more loosely bound layers due to lower linear charge density.
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Affiliation(s)
- Rubens A Silva
- Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
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29
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Effect of layer-by-layer confinement of polypeptides and polysaccharides onto thermoresponsive microgels: A comparative study. J Colloid Interface Sci 2010; 347:79-89. [DOI: 10.1016/j.jcis.2010.03.042] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Revised: 03/17/2010] [Accepted: 03/18/2010] [Indexed: 11/18/2022]
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Shen H, Watanabe J, Akashi M. Polyelectrolyte multilayers-modified polystyrene plate improves conventional immunoassay: full covering of the blocking reagent. Anal Chem 2010; 81:6923-8. [PMID: 19606875 DOI: 10.1021/ac900985x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this study, we fabricated polyelectrolyte multilayers (PEMs) on a polystyrene (PS) plate by a simple and novel alternate drop coating process (Acta Biomaterialia 2008, 4, 1255-1262), leading to the construction of a functional platform for improving conventional enzyme-linked immunosorbent assay (ELISA) systems. Poly(diallyldimethylammonium chloride) (PDDA) and poly(sodium 4-styrenesulfonate) (PSS) were used as cationic and anionic polyelectrolytes, and then positively or negatively charged surfaces were obtained on the PEMs. The PDDA/PSS PEMs on the PS plate had the following favorable characteristics. On the positive PEMs, the coverage of the blocking reagent (ovalbumin from egg white: OVA) was over 100% by electrostatic interaction between the protein and PEMs, hence, nonspecific adsorption from the secondary antibody was efficiently suppressed. Moreover, the positive PEMs showed higher sensitivity on the ELISA than the negative PEMs, including the PS plate. Regularly oscillating behavior for sensitivity (specific signal-to-noise ratio) was observed on 1-10-step assemblies. The calibration curves for antigen detection on the positive PEMs had wide range of concentration from 0.002 to 5 microg/mL, and largest change in signal as compared with the negative PEMs and the PS plate. In summary, we discovered that positive PEMs possessed excellent performance for ELISA systems, and PEMs could easily improve the immunoassay with a convenient process and diverse substrates.
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Affiliation(s)
- Heyun Shen
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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31
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Cortez C, Quinn JF, Hao X, Gudipati CS, Stenzel MH, Davis TP, Caruso F. Multilayer buildup and biofouling characteristics of PSS-b-PEG containing films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:9720-9727. [PMID: 20205461 DOI: 10.1021/la100430g] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Thin films exhibiting protein resistance are of interest in diverse areas, ranging from low fouling surfaces in biomedicine to marine applications. Herein, we report the preparation of low protein and cell binding multilayer thin films, formed by the alternate deposition of a block copolymer comprising polystyrene sulfonate and poly(poly(ethylene glycol) methyl ether acrylate) (PSS-b-PEG), and polyallylamine hydrochloride (PAH). Film buildup was followed by quartz crystal microgravimetry (QCM), which showed linear growth and a high degree of hydration of the PSS-b-PEG/PAH films. Protein adsorption studies with bovine serum albumin using QCM demonstrated that multilayer films of PSS/PAH with a terminal layer of PSS-b-PEG were up to 5-fold more protein resistant than PSS-terminated films. Protein binding was dependent on the ionic strength at which the terminal layer of PSS-b-PEG was adsorbed, as well as the pH of the protein solution. It was also possible to control the protein resistance of the films by coadsorption of the final layer with another component (PSS), which showed an increase in protein resistance as the proportion of PSS-b-PEG in the adsorption solution was increased. In addition, protein resistance could also be controlled by the location of a single PSS-b-PEG layer within a PSS/PAH film. Finally, the buildup of PSS-b-PEG/PAH films on colloidal particles was demonstrated. PSS-b-PEG-terminated particles exhibited a 6.5-fold enhancement in cell binding resistance compared with PSS-terminated particles. The stability of PSS-b-PEG films combined with their low protein and cell binding characteristics provide opportunities for the use of the films as low fouling coatings in devices and other surfaces requiring limited interaction with biological interfaces.
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Affiliation(s)
- Christina Cortez
- Centre for Nanoscience and Nanotechnology, Department of Chemical and Biomolecular Engineering, The University of Melbourne, Victoria 3010, Australia
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32
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Xie HG, Zheng JN, Li XX, Liu XD, Zhu J, Wang F, Xie WY, Ma XJ. Effect of surface morphology and charge on the amount and conformation of fibrinogen adsorbed onto alginate/chitosan microcapsules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:5587-5594. [PMID: 19919044 DOI: 10.1021/la903874g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We report the influence of surface morphology and charge of alginate/chitosan (ACA) microcapsules on both the amount of adsorbed protein and its secondary structural changes during adsorption. Variations in surface morphology and charge were controlled by varying alginate molecular weight and chitosan concentration. Plasma fibrinogen (Fgn) was chosen to model this adsorption to foreign surfaces. The surface of ACA microcapsules exhibited a granular structure after incubating calcium alginate beads with chitosan solution to form membranes. The surface roughness of ACA microcapsule membranes decreased with decreasing alginate molecular weight and chitosan concentration. Zeta potential measurements showed that there was a net negative charge on the surface of ACA microcapsules which decreased with decreasing alginate molecular weight and chitosan concentration. The increase in both surface roughness and zeta potential resulted in an increase in the amount of Fgn adsorbed. Moreover, the higher the zeta potential was, the stronger the protein-surface interaction between fibrinogen and ACA microcapsules was. More protein molecules adsorbed spread and had a greater conformational change on rougher surfaces for more surfaces being available for protein to attach.
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Affiliation(s)
- Hong G Xie
- Laboratory of Biomedical Material Engineering, Biotechnology Division, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People's Republic of China
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Park J, McShane MJ. Dual-function nanofilm coatings with diffusion control and protein resistance. ACS APPLIED MATERIALS & INTERFACES 2010; 2:991-7. [PMID: 20384292 DOI: 10.1021/am900673r] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
To date, limited examples of polyelectrolyte multilayers (PEMs) can be found that truly exploit the power of layer-by-layer nanoassembly to combine multiple functions into a complex multilayer. We demonstrate that PEMs can be designed as optimized coatings for implantable biosensors, exhibiting both diffusion control and protein resistance. PEM coatings comprising strong-weak and weak-weak pairs were evaluated, resulting in decreases in glucose diffusivity up to 5 orders of magnitude compared to water. Addition of poly(ethylene glycol) (PEG)-grafted terminal layers on the base diffusion-controlling multilayers substantially improved resistance to albumin adsorption relative to unmodified PEMs. For transport-controlling films comprising strong-weak polyelectrolyte pairs, the consistent diffusivity was observed even after exposure to protein-containing solutions, indicating minimal effects of biofouling. In contrast, the transport behavior of weak-weak polyelectrolyte pairs was susceptible to alteration by protein exposure, resulting in large variation in diffusivity, even when protein-resistant outer layers were employed.
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Affiliation(s)
- Jaebum Park
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843, USA
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34
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Fabrication of oriented poly-l-lysine/bacteriorhodopsin-embedded purple membrane multilayer structure for enhanced photoelectric response. J Colloid Interface Sci 2010; 344:150-7. [DOI: 10.1016/j.jcis.2009.12.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2009] [Revised: 12/02/2009] [Accepted: 12/03/2009] [Indexed: 11/21/2022]
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36
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Primorac E, Đapić I, Štrbe N, Kovačević D. Adsorption of bovine serum albumin on previously formed PAH/PSS multilayer: A stagnation point optical reflectometry study. Colloids Surf B Biointerfaces 2010; 76:305-10. [DOI: 10.1016/j.colsurfb.2009.11.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2009] [Revised: 10/13/2009] [Accepted: 11/12/2009] [Indexed: 11/15/2022]
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Dragan ES, Bucatariu F, Hitruc G. Sorption of Proteins onto Porous Single-Component Poly(vinyl amine) Multilayer Thin Films. Biomacromolecules 2010; 11:787-96. [DOI: 10.1021/bm9014057] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Ecaterina Stela Dragan
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41 A, RO-700487 Iasi, Romania
| | - Florin Bucatariu
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41 A, RO-700487 Iasi, Romania
| | - Gabriela Hitruc
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41 A, RO-700487 Iasi, Romania
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Boudou T, Crouzier T, Ren K, Blin G, Picart C. Multiple functionalities of polyelectrolyte multilayer films: new biomedical applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2010; 22:441-67. [PMID: 20217734 DOI: 10.1002/adma.200901327] [Citation(s) in RCA: 511] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The design of advanced functional materials with nanometer- and micrometer-scale control over their properties is of considerable interest for both fundamental and applied studies because of the many potential applications for these materials in the fields of biomedical materials, tissue engineering, and regenerative medicine. The layer-by-layer deposition technique introduced in the early 1990s by Decher, Moehwald, and Lvov is a versatile technique, which has attracted an increasing number of researchers in recent years due to its wide range of advantages for biomedical applications: ease of preparation under "mild" conditions compatible with physiological media, capability of incorporating bioactive molecules, extra-cellular matrix components and biopolymers in the films, tunable mechanical properties, and spatio-temporal control over film organization. The last few years have seen a significant increase in reports exploring the possibilities offered by diffusing molecules into films to control their internal structures or design "reservoirs," as well as control their mechanical properties. Such properties, associated with the chemical properties of films, are particularly important for designing biomedical devices that contain bioactive molecules. In this review, we highlight recent work on designing and controlling film properties at the nanometer and micrometer scales with a view to developing new biomaterial coatings, tissue engineered constructs that could mimic in vivo cellular microenvironments, and stem cell "niches."
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Affiliation(s)
- Thomas Boudou
- Grenoble-INP, LMGP-MINATEC, CNRS UMR 5628 3, Parvis Louis Néel, 38016 Grenoble, France
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Kharlampieva E, Jung CM, Kozlovskaya V, Tsukruk VV. Secondary structure of silaffin at interfaces and titania formation. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm00600a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Ting J, Haas M, Valenzuela S, Martin D. Terminating polyelectrolyte in multilayer films influences growth and morphology of adhering cells. IET Nanobiotechnol 2010; 4:77-90. [DOI: 10.1049/iet-nbt.2009.0016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Dragan ES, Bucatariu F. Cross-Linked Multilayers of Poly(vinyl amine) as a Single Component and Their Interaction with Proteins. Macromol Rapid Commun 2009; 31:317-22. [PMID: 21590909 DOI: 10.1002/marc.200900630] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2009] [Revised: 09/18/2009] [Indexed: 11/07/2022]
Abstract
Novel multilayer thin films that consist solely of cross-linked single component layers are generated by a selective cross-linking of the poly(vinyl amine) (PVAm) layers in [PVAm/poly(acrylic acid) (PAA)](n) thin films constructed either on silica particles or silicon wafers, followed by the removal of PAA. The surface topography of the (PVAm)(n) multilayer thin films, before and after the adsorption of human serum albumin (HSA), has been studied by atomic force microscopy on the freeze-dried films. The decrease of the average roughness of the film after the adsorption of HSA showed the protein was adsorbed into the (PVAm)(n) film making these films potential reservoirs for proteins.
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Affiliation(s)
- Ecaterina S Dragan
- "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41 A, 700487 Iasi, Romania.
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Yang X, Zhang H, Yuan X, Cui S. Wool keratin: A novel building block for layer-by-layer self-assembly. J Colloid Interface Sci 2009; 336:756-60. [DOI: 10.1016/j.jcis.2009.04.050] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2009] [Revised: 04/14/2009] [Accepted: 04/15/2009] [Indexed: 10/20/2022]
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Xiang Z, Sarazin P, Favis BD. Controlling Burst and Final Drug Release Times from Porous Polylactide Devices Derived from Co-continuous Polymer Blends. Biomacromolecules 2009; 10:2053-66. [DOI: 10.1021/bm8013632] [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)
- Zhenyu Xiang
- CREPEC, Department of Chemical Engineering, École Polytechnique de Montréal, P.O. Box 6079, Station Centre-ville, Montréal, (QC) Canada H3C 3A7
| | - Pierre Sarazin
- CREPEC, Department of Chemical Engineering, École Polytechnique de Montréal, P.O. Box 6079, Station Centre-ville, Montréal, (QC) Canada H3C 3A7
| | - Basil D. Favis
- CREPEC, Department of Chemical Engineering, École Polytechnique de Montréal, P.O. Box 6079, Station Centre-ville, Montréal, (QC) Canada H3C 3A7
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Saab MB, Estephan E, Cloitre T, Legros R, Cuisinier FJG, Zimányi L, Gergely C. Assembly of purple membranes on polyelectrolyte films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:5159-5167. [PMID: 19397356 DOI: 10.1021/la9002274] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The membrane protein bacteriorhodopsin in its native membrane bound form (purple membrane) was adsorbed and incorporated into polyelectrolyte multilayered films, and adsorption was in situ monitored by optical waveguide light-mode spectroscopy. The formation of a single layer or a double layer of purple membranes was observed when adsorbed on negatively or positively charged surfaces, respectively. The purple membrane patches adsorbed on the polyelectrolyte multilayers were also evidenced by atomic force microscopy images. The driving forces of the adsorption process were evaluated by varying the ionic strength of the solution as well as the purple membrane concentration. At high purple membrane concentration, interpenetrating polyelectrolyte loops might provide new binding sites for the adsorption of a second layer of purple membranes, whereas at lower concentrations only a single layer is formed. Negative surfaces do not promote a second protein layer adsorption. Driving forces other than just electrostatic ones, such as hydrophobic forces, should play a role in the polyelectrolyte/purple membrane layering. The subtle interplay of all these factors determines the formation of the polyelectrolyte/purple membrane matrix with a presumably high degree of orientation for the incorporated purple membranes, with their cytoplasmic, or extracellular side toward the bulk on negatively or positively charged polyelectrolyte, respectively. The structural stability of bacteriorhodopsin during adsorption onto the surface and incorporation into the polyelectrolyte multilayers was investigated by Fourier transform infrared spectroscopy in attenuated total reflection mode. Adsorption and incorporation of purple membranes within polyelectrolyte multilayers does not disturb the conformational majority of membrane-embedded alpha-helix structures of the protein, but may slightly alter the structure of the extramembraneous segments or their interaction with the environment. This high stability is different from the lower stability of the predominantly beta-sheet structures of numerous globular proteins when adsorbed onto surfaces.
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Affiliation(s)
- Marie-belle Saab
- Groupe d'Etude des Semi-conducteurs, UMR 5650, CNRS-Universite Montpellier II, 34095, Montpellier Cedex 5, France
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Souiri M, Mora-Ponsonnet L, Glinel K, Othmane A, Jouenne T, Duncan AC. Surface assembly on biofunctional magnetic nanobeads for the study of protein–ligand interactions. Colloids Surf B Biointerfaces 2009; 68:125-9. [DOI: 10.1016/j.colsurfb.2008.07.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2008] [Revised: 07/03/2008] [Accepted: 07/15/2008] [Indexed: 11/28/2022]
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Estephan E, Larroque C, Cuisinier FJG, Bálint Z, Gergely C. Tailoring GaN Semiconductor Surfaces with Biomolecules. J Phys Chem B 2008; 112:8799-805. [DOI: 10.1021/jp804112y] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Elias Estephan
- Groupe d’Etude des Semi-conducteurs, UMR 5650, CNRS-Université Montpellier II, 34095 Montpellier Cedex 5, France, Centre Régional de Lutte contre le Cancer Val d’Aurelle-Paul Lamarque, Université Montpellier I, 34298 Montpellier, France, EA 4203, UFR Odontologie, Université Montpellier I, 34193 Montpellier Cedex 5, France, and Institute of Biophysics, Biological Research Center of the Hungarian Academy of Sciences, 6726 Szeged, Hungary
| | - Christian Larroque
- Groupe d’Etude des Semi-conducteurs, UMR 5650, CNRS-Université Montpellier II, 34095 Montpellier Cedex 5, France, Centre Régional de Lutte contre le Cancer Val d’Aurelle-Paul Lamarque, Université Montpellier I, 34298 Montpellier, France, EA 4203, UFR Odontologie, Université Montpellier I, 34193 Montpellier Cedex 5, France, and Institute of Biophysics, Biological Research Center of the Hungarian Academy of Sciences, 6726 Szeged, Hungary
| | - Frédéric J. G. Cuisinier
- Groupe d’Etude des Semi-conducteurs, UMR 5650, CNRS-Université Montpellier II, 34095 Montpellier Cedex 5, France, Centre Régional de Lutte contre le Cancer Val d’Aurelle-Paul Lamarque, Université Montpellier I, 34298 Montpellier, France, EA 4203, UFR Odontologie, Université Montpellier I, 34193 Montpellier Cedex 5, France, and Institute of Biophysics, Biological Research Center of the Hungarian Academy of Sciences, 6726 Szeged, Hungary
| | - Zoltán Bálint
- Groupe d’Etude des Semi-conducteurs, UMR 5650, CNRS-Université Montpellier II, 34095 Montpellier Cedex 5, France, Centre Régional de Lutte contre le Cancer Val d’Aurelle-Paul Lamarque, Université Montpellier I, 34298 Montpellier, France, EA 4203, UFR Odontologie, Université Montpellier I, 34193 Montpellier Cedex 5, France, and Institute of Biophysics, Biological Research Center of the Hungarian Academy of Sciences, 6726 Szeged, Hungary
| | - Csilla Gergely
- Groupe d’Etude des Semi-conducteurs, UMR 5650, CNRS-Université Montpellier II, 34095 Montpellier Cedex 5, France, Centre Régional de Lutte contre le Cancer Val d’Aurelle-Paul Lamarque, Université Montpellier I, 34298 Montpellier, France, EA 4203, UFR Odontologie, Université Montpellier I, 34193 Montpellier Cedex 5, France, and Institute of Biophysics, Biological Research Center of the Hungarian Academy of Sciences, 6726 Szeged, Hungary
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Olugebefola SC, Kuhlman WA, Rubner MF, Mayes AM. Photopatterned nanoporosity in polyelectrolyte multilayer films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:5172-5178. [PMID: 18318557 DOI: 10.1021/la703936p] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We report on spatial control of nanoporosity in polyelectrolyte multilayer (PEM) films using photopatterning and its effects on film optical and adsorption properties. Multilayers assembled from poly(acrylic acid-ran-vinylbenzyl acrylate) (PAArVBA), a photo-cross-linking polymer, and poly(allylamine hydrochloric acid) (PAH) were patterned using ultraviolet light followed by immersion in low pH and then neutral pH solutions to induce nanoporosity in unexposed regions. Model charged small molecules rhodamine B, fluorescein, and propidium iodide and the model protein albumin exhibit increased adsorption to nanoporous regions of patterned PEM films as shown by fluorescence microscopy and radiolabeling experiments. Films assembled with alternating stacks of PAH/poly(sodium-4-styrene sulfonate) (SPS), which do not become nanoporous, and stacks of PAH/PAArVBA were patterned to create nanoporous capillary channels. Interdigitated channels demonstrated simultaneous, separate wicking of dimethyl sulfoxide-solvated fluorescein and rhodamine B. In addition, these heterostack structures exhibited patternable Bragg reflectivity of greater than 25% due to refractive index differences between the nanoporous and nonporous stacks. Finally, the PEM assembly process coupled with photo-cross-linking was used to create films with two separate stacked reflective patterns with a doubling in reflectivity where patterns overlapped. The combined adsorptive and reflective properties of these films hold promise for applications in diagnostic arrays and therapeutics delivery.
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Affiliation(s)
- Solar C Olugebefola
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Influence of assembling pH on the stability of poly(l-glutamic acid) and poly(l-lysine) multilayers against urea treatment. Colloids Surf B Biointerfaces 2008; 62:250-7. [DOI: 10.1016/j.colsurfb.2007.10.017] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2007] [Revised: 09/30/2007] [Accepted: 10/22/2007] [Indexed: 11/19/2022]
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Brunot C, Grosgogeat B, Picart C, Lagneau C, Jaffrezic-Renault N, Ponsonnet L. Response of fibroblast activity and polyelectrolyte multilayer films coating titanium. Dent Mater 2008; 24:1025-35. [PMID: 18237774 DOI: 10.1016/j.dental.2007.11.022] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2006] [Revised: 06/07/2007] [Accepted: 11/21/2007] [Indexed: 11/17/2022]
Abstract
OBJECTIVES The study of surface properties is a recent and crucial issue in the biomaterial fields applied to Odontology. The reference biomaterial in dental implantology is titanium. The principal objective is a perfect bio-integration in the oral ecosystem, both in terms of mucosal and bone tissues. The aim of this work was to optimize the tissue-titanium interface by applying polyelectrolyte multilayer films on the surface of titanium. METHODS The experimental study was undertaken on pure titanium samples. Two types of film ending with polycations or polyanions were selected. Both film types were built with a first poly(ethyleneimine) (PEI) base layer and composed either of poly(styrene sulfonate) (PSS) and poly(allylamine hydrochloride) (PAH) or of hyaluronic acid (HA) and poly(l-lysine) (PLL) layers. Final architectures were as follows: PEI-(PSS/PAH)(10), or PEI-(PSS/PAH)(10)-PSS, or chemically cross-linked PEI-(HA/PLL)(10) or PEI-(HA/PLL)(10)-HA. An analysis of the physicochemical characteristics of the surfaces was carried out by tensiometry measurements (dynamic contact angle, wettability, contact angle hysteresis) and atomic force microscopy. A biological study with human fibroblasts was followed over a 7-day culture period at days 0, 2, 4 and 7 to observe the cellular response in terms of morphology (scanning electron microscopy) and viability (Mosmann's test). RESULTS The results showed that polyelectrolyte multilayer films could be successfully deposited onto titanium as previously described for glass or composite. Fibroblast adhesion and proliferation was strongly dependent on film type. SEM observations of cells on the different films agreed with the viability cell test. Furthermore, films containing PSS/PAH generated a better cellular response than films containing cross-linked HA/PLL. CONCLUSION PSS/PAH polyelectrolyte films coating titanium could represent a new approach for oral bio-integration with great potential for clinical application in the fields of dental implantology. More particularly, the specific biofunctionalization of PSS/PAH films coating titanium could be envisioned by introducing layers of molecules that encourage the bio-integration process between the films.
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Affiliation(s)
- C Brunot
- Laboratoire des Multimatériaux et des Interfaces, UMR CNRS 5615, Université de Lyon, Université Lyon 1, Faculté d'Odontologie, Rue Guillaume Paradin, F-69372 Lyon Cedex 08, France.
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Hollmann O, Steitz R, Czeslik C. Structure and dynamics of α-lactalbumin adsorbed at a charged brush interface. Phys Chem Chem Phys 2008; 10:1448-56. [DOI: 10.1039/b716264b] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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