1
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Jain K, Pandey A, Wang H, Chung T, Nemati A, Kanchanawong P, Sheetz MP, Cai H, Changede R. TiO 2 Nano-Biopatterning Reveals Optimal Ligand Presentation for Cell-Matrix Adhesion Formation. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2309284. [PMID: 38340044 PMCID: PMC11126362 DOI: 10.1002/adma.202309284] [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: 09/09/2023] [Revised: 01/31/2024] [Indexed: 02/12/2024]
Abstract
Nanoscale organization of transmembrane receptors is critical for cellular functions, enabled by the nanoscale engineering of bioligand presentation. Previously, a spatial threshold of ≤60 nm for integrin binding ligands in cell-matrix adhesion is demonstrated using monoliganded gold nanoparticles. However, the ligand geometric arrangement is limited to hexagonal arrays of monoligands, while plasmonic quenching limits further investigation by fluorescence-based high-resolution imaging. Here, these limitations are overcome with dielectric TiO2 nanopatterns, eliminating fluorescence quenching, thus enabling super-resolution fluorescence microscopy on nanopatterns. By dual-color super-resolution imaging, high precision and consistency among nanopatterns, bioligands, and integrin nanoclusters are observed, validating the high quality and integrity of both nanopattern functionalization and passivation. By screening TiO2 nanodiscs with various diameters, an increase in fibroblast cell adhesion, spreading area, and Yes-associated protein (YAP) nuclear localization on 100 nm diameter compared with smaller diameters was observed. Focal adhesion kinase is identified as the regulatory signal. These findings explore the optimal ligand presentation when the minimal requirements are sufficiently fulfilled in the heterogenous extracellular matrix network of isolated binding regions with abundant ligands. Integration of high-fidelity nano-biopatterning with super-resolution imaging allows precise quantitative studies to address early signaling events in response to receptor clustering and their nanoscale organization.
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Affiliation(s)
- Kashish Jain
- Mechanobiology Institute, National University of Singapore, Singapore, Singapore
| | - Ashish Pandey
- Tech4Health Institute and Department of Radiology, NYU Langone Health, New York, NY, USA
| | - Hao Wang
- Tech4Health Institute and Department of Radiology, NYU Langone Health, New York, NY, USA
| | - Taerin Chung
- Tech4Health Institute and Department of Radiology, NYU Langone Health, New York, NY, USA
| | - Arash Nemati
- Tech4Health Institute and Department of Radiology, NYU Langone Health, New York, NY, USA
| | - Pakorn Kanchanawong
- Mechanobiology Institute, National University of Singapore, Singapore, Singapore
- Department of Biomedical Engineering, National University of Singapore, Singapore, Singapore
| | - Michael P. Sheetz
- Mechanobiology Institute, National University of Singapore, Singapore, Singapore
- Molecular Mechanomedicine Program, Biochemistry and Molecular Biology Department, University of Texas Medical Branch, Galveston, TX, USA
| | - Haogang Cai
- Tech4Health Institute and Department of Radiology, NYU Langone Health, New York, NY, USA
- Department of Biomedical Engineering, New York University, Brooklyn, NY, USA
| | - Rishita Changede
- Mechanobiology Institute, National University of Singapore, Singapore, Singapore
- TeOra Pte. Ltd, Singapore, Singapore
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2
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Sadraddin A. Synthesis and characterization of novel thermoresponsive suspensions via physical adsorption of poly[di(ethylene glycol) methyl methacrylate] onto polystyrene microparticles. Des Monomers Polym 2023; 26:163-170. [PMID: 37181151 PMCID: PMC10173789 DOI: 10.1080/15685551.2023.2211356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 05/03/2023] [Indexed: 05/16/2023] Open
Abstract
Thermoreversible colloidal suspensions/gels have attracted recent research attention in the field of biomedical applications. In this study, a novel thermoresponsive particle suspension with thermoreversible gelation properties has been prepared for biomedical application. First, polystyrene (PS) microspheres were synthesized by dispersion polymerization and poly diethyleneglycolmethylmethacrylate (PDEGMA) polymer were synthesized via free radical polymerisation. Then, the new developed thermoresponsive suspensions were prepared via physical adsorption of a thermoresponsive polymer, poly[di (ethylene glycol) methyl methacrylate] (PDEGMA), onto the surface of polystyrene microspheres. PDEGMA acts as a steric stabilizer and induces thermoreversible gelation via chain extending and collapsing below and above its lower critical solution temperature (LCST), respectively. Scanning electron microscopy (SEM), 1H NMR spectroscopy, Gel permeation chromatography (GPC), UV-vis spectroscopy, Rheometric measurement were conducted to characterize the prepared particles, polymers and suspensions. SEM images show that monodisperse microspheres with the sizes range 1.5-3.5 μm were prepared. UV-vis measurements demonstrate thermoresponsive properties of PDEGMA. 1H NMR and GPC analysis confirms structural properties of prepared PDEGMA. Tube inversion tests demonstrated that the aqueous suspensions of the particles and polymer exhibited thermoreversible fluid-to-gel transitions. Rheological characterization revealed that the viscoelastic properties of the prepared suspension/gels can be fine tuned. This enables applications of the prepared gels as scaffolds for three-dimensional (3D) cell cultures.
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Affiliation(s)
- Azad Sadraddin
- Chemistry Department, Education College, Salahaddin University, Iraqi kurdistan, Iraq
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3
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Zhang X, Bai R, Sun Q, Zhuang Z, Zhang Y, Chen S, Han B. Bio-inspired special wettability in oral antibacterial applications. Front Bioeng Biotechnol 2022; 10:1001616. [PMID: 36110327 PMCID: PMC9468580 DOI: 10.3389/fbioe.2022.1001616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Accepted: 08/05/2022] [Indexed: 11/13/2022] Open
Abstract
Most oral diseases originate from biofilms whose formation is originated from the adhesion of salivary proteins and pioneer bacteria. Therefore, antimicrobial materials are mainly based on bactericidal methods, most of which have drug resistance and toxicity. Natural antifouling surfaces inspire new antibacterial strategies. The super wettable surfaces of lotus leaves and fish scales prompt design of biomimetic oral materials covered or mixed with super wettable materials to prevent adhesion. Bioinspired slippery surfaces come from pitcher plants, whose porous surfaces are infiltrated with lubricating liquid to form superhydrophobic surfaces to reduce the contact with liquids. It is believed that these new methods could provide promising directions for oral antimicrobial practice, improving antimicrobial efficacy.
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Affiliation(s)
- Xin Zhang
- Department of Orthodontics, School and Hospital of Stomatology, Peking University, Beijing, China
- National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Rushui Bai
- Department of Orthodontics, School and Hospital of Stomatology, Peking University, Beijing, China
- National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Qiannan Sun
- Department of Orthodontics, School and Hospital of Stomatology, Peking University, Beijing, China
- National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Zimeng Zhuang
- Department of Orthodontics, School and Hospital of Stomatology, Peking University, Beijing, China
- National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Yunfan Zhang
- Department of Orthodontics, School and Hospital of Stomatology, Peking University, Beijing, China
- National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing, China
- *Correspondence: Yunfan Zhang, ; Si Chen, ; Bing Han,
| | - Si Chen
- Department of Orthodontics, School and Hospital of Stomatology, Peking University, Beijing, China
- National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing, China
- *Correspondence: Yunfan Zhang, ; Si Chen, ; Bing Han,
| | - Bing Han
- Department of Orthodontics, School and Hospital of Stomatology, Peking University, Beijing, China
- National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing, China
- *Correspondence: Yunfan Zhang, ; Si Chen, ; Bing Han,
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4
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Jain K, Kanchanawong P, Sheetz MP, Zhou X, Cai H, Changede R. Ligand functionalization of titanium nanopattern enables the analysis of cell-ligand interactions by super-resolution microscopy. Nat Protoc 2022; 17:2275-2306. [PMID: 35896742 DOI: 10.1038/s41596-022-00717-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 04/26/2022] [Indexed: 12/19/2022]
Abstract
The spatiotemporal aspects of early signaling events during interactions between cells and their environment dictate multiple downstream outcomes. While advances in nanopatterning techniques have allowed the isolation of these signaling events, a major limitation of conventional nanopatterning methods is its dependence on gold (Au) or related materials that plasmonically quench fluorescence and, thus, are incompatible with super-resolution fluorescence microscopy. Here we describe a novel method that integrates nanopatterning with single-molecule resolution fluorescence imaging, thus enabling mechanistic dissection of molecular-scale signaling events in conjunction with nanoscale geometry manipulation. Our method exploits nanofabricated titanium (Ti) whose oxide (TiO2) is a dielectric material with no plasmonic effects. We describe the surface chemistry for decorating specific ligands such as cyclo-RGD (arginine, glycine and aspartate: a ligand for fibronectin-binding integrins) on TiO2 nanoline and nanodot substrates, and demonstrate the ability to perform dual-color super-resolution imaging on these patterns. Ti nanofabrication is similar to other metallic materials like Au, while the functionalization of TiO2 is relatively fast, safe, economical, easy to set up with commonly available reagents, and robust against environmental parameters such as humidity. Fabrication of nanopatterns takes ~2-3 d, preparation for functionalization ~1.5-2 d, and functionalization 3 h, after which cell culture and imaging experiments can be performed. We suggest that this method may facilitate the interrogation of nanoscale geometry and force at single-molecule resolution, and should find ready applications in early detection and interpretation of physiochemical signaling events at the cell membrane in the fields of cell biology, immunology, regenerative medicine, and related fields.
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Affiliation(s)
- Kashish Jain
- Mechanobiology Institute, National University of Singapore, Singapore, Singapore
| | - Pakorn Kanchanawong
- Mechanobiology Institute, National University of Singapore, Singapore, Singapore.,Department of Biomedical Engineering, National University of Singapore, Singapore, Singapore
| | - Michael P Sheetz
- Mechanobiology Institute, National University of Singapore, Singapore, Singapore.,Molecular Mechanomedicine Program, Biochemistry and Molecular Biology Department, University of Texas Medical Branch, Galveston, TX, USA
| | - Xianjing Zhou
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, USA
| | - Haogang Cai
- Tech4Health Institute and Department of Radiology, NYU Langone Health, New York, NY, USA.
| | - Rishita Changede
- Mechanobiology Institute, National University of Singapore, Singapore, Singapore. .,TeOra Pte. Ltd, Singapore, Singapore.
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5
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Ma J, Ma C, Huang X, de Araujo PHH, Goyal AK, Lu G, Feng C. Preparation and Cellular Uptake Behaviors of Uniform Fiber-like Micelles with Length Controllability and High Colloidal Stability in Aqueous Media. FUNDAMENTAL RESEARCH 2022. [DOI: 10.1016/j.fmre.2022.01.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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6
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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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7
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Polyethylene Glycol Pulsed Electrodeposition for the Development of Antifouling Coatings on Titanium. COATINGS 2020. [DOI: 10.3390/coatings10050456] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Titanium dental implants are widely used for the replacement of damaged teeth. However, bacterial infections at the interface between soft tissues and the implant can impair the functionality of the device and lead to failure. In this work, the preparation of an antifouling coating of polyethylene glycol (PEG) on titanium by pulsed electrodeposition was investigated in order to reduce Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) adhesion while maintaining human fibroblast adhesion. Different pulsed conditions were prepared and characterized by contact angle, Focused Ion Beam (FIB), Fourier Transformed Infrared Spectroscopy in the Attenuated Total Reflectance mode (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS). XPS tested fibronectin adsorption. S. aureus, E. coli and human fibroblast adhesion was tested in vitro in both mono and co-culture settings. Physicochemical characterization proved useful for confirming the presence of PEG and evaluating the efficiency of the coating methods. Fibronectin adsorption decreased for all of the conditions, but an adsorption of 20% when compared to titanium was maintained, which supported fibroblast adhesion on the surfaces. In contrast, S. aureus and E. coli attachment on coated surfaces decreased up to 90% vs. control titanium. Co-culture studies with the two bacterial strains and human fibroblasts showed the efficacy of the coatings to allow for eukaryotic cell adhesion, even in the presence of pre-adhered bacteria.
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8
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Attarde SS, Pandit SV. Anticancer potential of nanogold conjugated toxin GNP-NN-32 from Naja naja venom. J Venom Anim Toxins Incl Trop Dis 2020; 26:e20190047. [PMID: 32180805 PMCID: PMC7059613 DOI: 10.1590/1678-9199-jvatitd-2019-0047] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Background: Cancer is the second most common fatal disease in the world, behind cardiovascular disorders in the first place. It accounts for around 0.3 million deaths per year in India due to the lack of proper diagnostic facilities, prevention and treatment. Current therapeutic methods do not provide adequate protection and affect normal cells along with cancerous ones. Thus, there is a need for some alternative therapeutic strategy, preferably from natural products, which have been traditionally used for treatment of various diseases in the country. Methods: In this study, we have conjugated purified NN-32 toxin from Naja naja venom with gold nanoparticles and its anticancer potential was evaluated against human breast cancer cell lines. UV-Vis spectroscopy, dynamic light scattering, transmission electron microscopy, atomic force microscopy and zeta potential analysis were the techniques used for characterization of GNP-NN-32. Results: GNP-NN-32 showed dose- and time-dependent cytotoxicity against breast cancer cell lines (MCF-7 and MDA-MB-231). NN-32 and GNP-NN-32 induced apoptosis in both breast cancer cell lines. The results of CFSE cell proliferation study revealed that NN-32 and GNP-NN-32 arrested cell division in both MCF-7 and MDA-MB-231 cell lines resulting in inhibition of proliferation of these cancer cells. Conclusion: GNP-NN-32 showed an anticancer potential against human breast cancer cell lines. Analysis of detailed chemical characterization along with its cytotoxic property might help to perceive a new dimension of the anti-cancer potential of GNP-NN-32 that will enhance its biomedical function in near future.
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Affiliation(s)
- Saurabh S Attarde
- Evolutionary Venomics Laboratory, Centre for Ecological Sciences, Indian Institute of Science, Bangalore, Karnataka, India
| | - Sangeeta V Pandit
- Department of Zoology, Savitribai Phule Pune University, Pune, Maharashtra, India
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9
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Griffo A, Liu Y, Mahlberg R, Alakomi HL, Johansson LS, Milani R. Design and Testing of a Bending-Resistant Transparent Nanocoating for Optoacoustic Cochlear Implants. ChemistryOpen 2019; 8:1100-1108. [PMID: 31406657 PMCID: PMC6682933 DOI: 10.1002/open.201900172] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Indexed: 12/25/2022] Open
Abstract
A nanosized coating was designed to reduce fouling on the surface of a new type of cochlear implant relying on optoacoustic stimulation. This kind of device imposes novel design principles for antifouling coatings, such as optical transparency and resistance to significant constant bending. To reach this goal we deposited on poly(dimethylsiloxane) a PEO-based layer with negligible thickness compared to the curvature radius of the cochlea. Its antifouling performance was monitored upon storage by quartz crystal microbalance, and its resistance upon bending was tested by fluorescence microscopy under geometrical constraints similar to those of implantation. The coating displayed excellent antifouling features and good stability, and proved suitable for further testing in real-environment conditions.
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Affiliation(s)
- Alessandra Griffo
- VTT Technical Research Centre of Finland Ltd. P.O. Box 1000 FI-02044VTT Espoo Finland.,Department of Bioproducts and Biosystems Aalto University P.O. Box 16100 FI-00076Aalto Espoo Finland
| | - Yingying Liu
- VTT Technical Research Centre of Finland Ltd. P.O. Box 1000 FI-02044VTT Espoo Finland
| | - Riitta Mahlberg
- VTT Technical Research Centre of Finland Ltd. P.O. Box 1000 FI-02044VTT Espoo Finland
| | - Hanna-L Alakomi
- VTT Technical Research Centre of Finland Ltd. P.O. Box 1000 FI-02044VTT Espoo Finland
| | - Leena-S Johansson
- Department of Bioproducts and Biosystems Aalto University P.O. Box 16100 FI-00076Aalto Espoo Finland
| | - Roberto Milani
- VTT Technical Research Centre of Finland Ltd. P.O. Box 1000 FI-02044VTT Espoo Finland
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10
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Joh DY, Zimmers Z, Avlani M, Heggestad JT, Aydin HB, Ganson N, Kumar S, Fontes C, Achar RK, Hershfield MS, Hucknall AM, Chilkoti A. Architectural Modification of Conformal PEG-Bottlebrush Coatings Minimizes Anti-PEG Antigenicity While Preserving Stealth Properties. Adv Healthc Mater 2019; 8:e1801177. [PMID: 30908902 PMCID: PMC6819148 DOI: 10.1002/adhm.201801177] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Revised: 02/12/2019] [Indexed: 01/18/2023]
Abstract
Poly(ethylene glycol) (PEG), a linear polymer known for its "stealth" properties, is commonly used to passivate the surface of biomedical implants and devices, and it is conjugated to biologic drugs to improve their pharmacokinetics. However, its antigenicity is a growing concern. Here, the antigenicity of PEG is investigated when assembled in a poly(oligoethylene glycol) methacrylate (POEGMA) "bottlebrush" configuration on a planar surface. Using ethylene glycol (EG) repeat lengths of the POEGMA sidechains as a tunable parameter for optimization, POEGMA brushes with sidechain lengths of two and three EG repeats are identified as the optimal polymer architecture to minimize binding of anti-PEG antibodies (APAs), while retaining resistance to nonspecific binding by bovine serum albumin and cultured cells. Binding of backbone- versus endgroup-selective APAs to POEGMA brushes is further investigated, and finally the antigenicity of POEGMA coatings is assessed against APA-positive clinical plasma samples. These results are applied toward fabricating immunoassays on POEGMA surfaces with minimal reactivity toward APAs while retaining a low limit-of-detection for the analyte. Taken together, these results offer useful design concepts to reduce the antigenicity of polymer brush-based surface coatings used in applications involving human or animal matrices.
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Affiliation(s)
- Daniel Y. Joh
- Department of Biomedical Engineering, Pratt School of Engineering, Duke University, Durham NC 27708 USA
| | - Zackary Zimmers
- Department of Biomedical Engineering, Pratt School of Engineering, Duke University, Durham NC 27708 USA
| | - Manav Avlani
- Department of Biomedical Engineering, Pratt School of Engineering, Duke University, Durham NC 27708 USA
| | - Jacob T. Heggestad
- Department of Biomedical Engineering, Pratt School of Engineering, Duke University, Durham NC 27708 USA
| | - Hakan B. Aydin
- Department of Biomedical Engineering, Pratt School of Engineering, Duke University, Durham NC 27708 USA
| | - Nancy Ganson
- Department of Medicine, Division of Rheumatology, Duke University Medical Center, Durham, NC 27710 USA
| | - Shourya Kumar
- Department of Biomedical Engineering, Pratt School of Engineering, Duke University, Durham NC 27708 USA
| | - Cassio Fontes
- Department of Biomedical Engineering, Pratt School of Engineering, Duke University, Durham NC 27708 USA
| | - Rohan K. Achar
- Department of Biomedical Engineering, Pratt School of Engineering, Duke University, Durham NC 27708 USA
| | - Michael S. Hershfield
- Department of Medicine, Division of Rheumatology, Duke University Medical Center, Durham, NC 27710 USA
- Department of Biochemistry, Duke University School of Medicine, Durham NC 27710 USA
| | - Angus M. Hucknall
- Department of Biomedical Engineering, Pratt School of Engineering, Duke University, Durham NC 27708 USA
| | - Ashutosh Chilkoti
- Department of Biomedical Engineering, Pratt School of Engineering, Duke University, Durham NC 27708 USA
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11
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Hein R, Borissov A, Smith MD, Beer PD, Davis JJ. A halogen-bonding foldamer molecular film for selective reagentless anion sensing in water. Chem Commun (Camb) 2019; 55:4849-4852. [DOI: 10.1039/c9cc00335e] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A novel halogen-bonding foldamer molecular film was utilised to achieve anion sensing in pure water via non-faradaic capacitance spectroscopy.
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Affiliation(s)
- Robert Hein
- Department of Chemistry
- University of Oxford
- Oxford OX1 3QZ
- UK
| | | | | | - Paul D. Beer
- Department of Chemistry
- University of Oxford
- Oxford OX1 3QZ
- UK
| | - Jason J. Davis
- Department of Chemistry
- University of Oxford
- Oxford OX1 3QZ
- UK
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12
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Pardo-Figuerez M, Martin NRW, Player DJ, Roach P, Christie SDR, Capel AJ, Lewis MP. Controlled Arrangement of Neuronal Cells on Surfaces Functionalized with Micropatterned Polymer Brushes. ACS OMEGA 2018; 3:12383-12391. [PMID: 30411006 PMCID: PMC6217525 DOI: 10.1021/acsomega.8b01698] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 09/17/2018] [Indexed: 05/03/2023]
Abstract
Conventional in vitro cultures are useful to represent simplistic neuronal behavior; however, the lack of organization results in random neurite spreading. To overcome this problem, control over the directionality of SH-SY5Y cells was attained, utilizing photolithography to pattern the cell-repulsive anionic brush poly(potassium 3-sulfopropyl methacrylate) (PKSPMA) into tracks of 20, 40, 80, and 100 μm width. These data validate the use of PKSPMA brush coatings for a long-term culture of the SH-SY5Y cells, as well as providing a methodology by which the precise deposition of PKSPMA can be utilized to achieve a targeted control over the SH-SY5Y cells. Specifically, the PKSPMA brush patterns prevented cell attachment, allowing the SH-SY5Y cells to grow only on noncoated glass (gaps of 20, 50, 75, and 100 μm width) at different cell densities (5000, 10 000, and 15 000 cells/cm2). This research demonstrates the importance of achieving cell directionality in vitro, while these simplistic models could provide new platforms to study complex neuron-neuron interactions.
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Affiliation(s)
- Maria Pardo-Figuerez
- National
Centre for Sport and Exercise Medicine (NCSEM), School of
Sport, Exercise and Health Sciences, and Department of Chemistry, School
of Science, Loughborough University, Loughborough LE11 3TU, U.K.
| | - Neil R. W. Martin
- National
Centre for Sport and Exercise Medicine (NCSEM), School of
Sport, Exercise and Health Sciences, and Department of Chemistry, School
of Science, Loughborough University, Loughborough LE11 3TU, U.K.
| | - Darren J. Player
- National
Centre for Sport and Exercise Medicine (NCSEM), School of
Sport, Exercise and Health Sciences, and Department of Chemistry, School
of Science, Loughborough University, Loughborough LE11 3TU, U.K.
- Institute
of Orthopaedics and Musculoskeletal Science, University College London, Stanmore HA7 4LP, U.K.
| | - Paul Roach
- National
Centre for Sport and Exercise Medicine (NCSEM), School of
Sport, Exercise and Health Sciences, and Department of Chemistry, School
of Science, Loughborough University, Loughborough LE11 3TU, U.K.
| | - Steven D. R. Christie
- National
Centre for Sport and Exercise Medicine (NCSEM), School of
Sport, Exercise and Health Sciences, and Department of Chemistry, School
of Science, Loughborough University, Loughborough LE11 3TU, U.K.
| | - Andrew J. Capel
- National
Centre for Sport and Exercise Medicine (NCSEM), School of
Sport, Exercise and Health Sciences, and Department of Chemistry, School
of Science, Loughborough University, Loughborough LE11 3TU, U.K.
| | - Mark P. Lewis
- National
Centre for Sport and Exercise Medicine (NCSEM), School of
Sport, Exercise and Health Sciences, and Department of Chemistry, School
of Science, Loughborough University, Loughborough LE11 3TU, U.K.
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13
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Illés E, Szekeres M, Tóth IY, Farkas K, Földesi I, Szabó Á, Iván B, Tombácz E. PEGylation of Superparamagnetic Iron Oxide Nanoparticles with Self-Organizing Polyacrylate-PEG Brushes for Contrast Enhancement in MRI Diagnosis. NANOMATERIALS (BASEL, SWITZERLAND) 2018; 8:E776. [PMID: 30274317 PMCID: PMC6215243 DOI: 10.3390/nano8100776] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Revised: 09/24/2018] [Accepted: 09/27/2018] [Indexed: 11/19/2022]
Abstract
For biomedical applications, superparamagnetic nanoparticles (MNPs) have to be coated with a stealth layer that provides colloidal stability in biological media, long enough persistence and circulation times for reaching the expected medical aims, and anchor sites for further attachment of bioactive agents. One of such stealth molecules designed and synthesized by us, poly(polyethylene glycol methacrylate-co-acrylic acid) referred to as P(PEGMA-AA), was demonstrated to make MNPs reasonably resistant to cell internalization, and be an excellent candidate for magnetic hyperthermia treatments in addition to possessing the necessary colloidal stability under physiological conditions (Illés et al. J. Magn. Magn. Mater. 2018, 451, 710⁻720). In the present work, we elaborated on the molecular background of the formation of the P(PEGMA-AA)-coated MNPs, and of their remarkable colloidal stability and salt tolerance by using potentiometric acid⁻base titration, adsorption isotherm determination, infrared spectroscopy (FT-IR ATR), dynamic light scattering, and electrokinetic potential determination methods. The P(PEGMA-AA)@MNPs have excellent blood compatibility as demonstrated in blood sedimentation, smears, and white blood cell viability experiments. In addition, blood serum proteins formed a protein corona, protecting the particles against aggregation (found in dynamic light scattering and electrokinetic potential measurements). Our novel particles also proved to be promising candidates for MRI diagnosis, exhibiting one of the highest values of r2 relaxivity (451 mM-1s-1) found in literature.
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Affiliation(s)
- Erzsébet Illés
- Department of Physical Chemistry and Materials Science, University of Szeged, Aradi Vt. 1, H-6720 Szeged, Hungary.
| | - Márta Szekeres
- Department of Physical Chemistry and Materials Science, University of Szeged, Aradi Vt. 1, H-6720 Szeged, Hungary.
| | - Ildikó Y Tóth
- Department of Physical Chemistry and Materials Science, University of Szeged, Aradi Vt. 1, H-6720 Szeged, Hungary.
| | - Katalin Farkas
- Department of Laboratory Medicine, University of Szeged, Semmelweis u. 6, H-6720 Szeged, Hungary.
| | - Imre Földesi
- Department of Laboratory Medicine, University of Szeged, Semmelweis u. 6, H-6720 Szeged, Hungary.
| | - Ákos Szabó
- Polymer Chemistry Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, P.O. Box 286, H-1519 Budapest, Hungary.
| | - Béla Iván
- Polymer Chemistry Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, P.O. Box 286, H-1519 Budapest, Hungary.
| | - Etelka Tombácz
- Department of Food Engineering, University of Szeged, Moszkvai krt. 5-7, H-6725 Szeged, Hungary.
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14
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Cui X, Murakami T, Tamura Y, Aoki K, Hoshino Y, Miura Y. Bacterial Inhibition and Osteoblast Adhesion on Ti Alloy Surfaces Modified by Poly(PEGMA- r-Phosmer) Coating. ACS APPLIED MATERIALS & INTERFACES 2018; 10:23674-23681. [PMID: 29944334 DOI: 10.1021/acsami.8b07757] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We have synthesized and immobilized PEGMA500-Phosmer to Ti6Al4V surfaces by a simple procedure to reduce bacteria-associated infection without degrading the cell response. Adhered bacteria coverage was lessened to 1% on polymer-coated surfaces when exposed to Escherichia coli, Staphylococcus epidermidis, and Streptococcus mutans. Moreover, PEGMA500-Phosmer and homoPhosmer coatings presented better responses to MC3T3-E1 preosteoblast cells when compared with the results for PEGMA2000-Phosmer-coated and raw Ti alloy surfaces. The behavior of balancing bacterial inhibition and cell attraction of the PEGMA500-Phosmer coating was explained by the grafted phosphate groups, with an appropriate PEG brush length facilitating greater levels of calcium deposition and further fibronectin adsorption when compared with that of the raw Ti alloy surface.
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Affiliation(s)
- Xinnan Cui
- Department of Chemical Engineering, Graduate School of Engineering , Kyushu University , 744 Motooka , Nishi-ku, Fukuoka 819-0395 , Japan
| | - Tatsuya Murakami
- Center for Nano Materials and Technology , Japan Advanced Institute of Science and Technology , 1-1 Asahidai , Nomi , Ishikawa 923-1292 , Japan
| | | | | | - Yu Hoshino
- Department of Chemical Engineering, Graduate School of Engineering , Kyushu University , 744 Motooka , Nishi-ku, Fukuoka 819-0395 , Japan
| | - Yoshiko Miura
- Department of Chemical Engineering, Graduate School of Engineering , Kyushu University , 744 Motooka , Nishi-ku, Fukuoka 819-0395 , Japan
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15
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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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16
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Self-Assembled Monolayers for Dental Implants. Int J Dent 2018; 2018:4395460. [PMID: 29552036 PMCID: PMC5818935 DOI: 10.1155/2018/4395460] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Accepted: 10/26/2017] [Indexed: 02/06/2023] Open
Abstract
Implant-based therapy is a mature approach to recover the health conditions of patients affected by edentulism. Thousands of dental implants are placed each year since their introduction in the 80s. However, implantology faces challenges that require more research strategies such as new support therapies for a world population with a continuous increase of life expectancy, to control periodontal status and new bioactive surfaces for implants. The present review is focused on self-assembled monolayers (SAMs) for dental implant materials as a nanoscale-processing approach to modify titanium surfaces. SAMs represent an easy, accurate, and precise approach to modify surface properties. These are stable, well-defined, and well-organized organic structures that allow to control the chemical properties of the interface at the molecular scale. The ability to control the composition and properties of SAMs precisely through synthesis (i.e., the synthetic chemistry of organic compounds with a wide range of functional groups is well established and in general very simple, being commercially available), combined with the simple methods to pattern their functional groups on complex geometry appliances, makes them a good system for fundamental studies regarding the interaction between surfaces, proteins, and cells, as well as to engineering surfaces in order to develop new biomaterials.
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17
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Cai H, Depoil D, Muller J, Sheetz MP, Dustin ML, Wind SJ. Spatial Control of Biological Ligands on Surfaces Applied to T Cell Activation. Methods Mol Biol 2018; 1584:307-331. [PMID: 28255709 DOI: 10.1007/978-1-4939-6881-7_18] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
In this chapter, we present techniques, based on molecular-scale nanofabrication and selective self-assembly, for the presentation of biomolecules of interest (ligands, receptors, etc.) on a surface with precise spatial control and arbitrary geometry at the single-molecule level. Metallic nanodot arrays are created on glass coverslips and are then used as anchors for the immobilization of biological ligands via thiol linking chemistry. The nanodot size is controlled by both lithography and metallization. The reagent concentration in self-assembly can be adjusted to ensure single-molecule occupancy for a given dot size. The surrounding glass is backfilled by a protein-repellent layer to prevent nonspecific adsorption. Moreover, bifunctional surfaces are created, whereby a second ligand is presented on the background, which is frequently a requirement for simulating complex cellular functions involving more than one key ligand. This platform serves as a novel and powerful tool for molecular and cellular biology, e.g., to study the fundamental mechanisms of receptor-mediated signaling.
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Affiliation(s)
- Haogang Cai
- Department of Mechanical Engineering, Columbia University, New York, USA
| | - David Depoil
- Kennedy Institute of Rheumatology, NDORMS, The University of Oxford, Oxford, UK
| | - James Muller
- Department of Pathology, Skirball Institute, New York University School of Medicine, New York, USA
| | - Michael P Sheetz
- Department of Biological Sciences, Columbia University, New York, USA.,National University of Singapore, Singapore, Singapore
| | - Michael L Dustin
- Kennedy Institute of Rheumatology, NDORMS, The University of Oxford, Oxford, UK.,Department of Pathology, Skirball Institute, New York University School of Medicine, New York, USA
| | - Shalom J Wind
- Department of Applied Physics and Applied Mathematics, Columbia University, 500 W 120th St, New York, NY, 10027, USA.
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18
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Adamson K, Spain E, Prendergast U, Moran N, Forster RJ, Keyes TE. Fibrinogen Motif Discriminates Platelet and Cell Capture in Peptide-Modified Gold Micropore Arrays. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:715-725. [PMID: 29240434 DOI: 10.1021/acs.langmuir.7b03279] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Human blood platelets and SK-N-AS neuroblastoma cancer-cell capture at spontaneously adsorbed monolayers of fibrinogen-binding motifs, GRGDS (generic integrin adhesion), HHLGGAKQAGDV (exclusive to platelet integrin αIIbβ3), or octanethiol (adhesion inhibitor) at planar gold and ordered 1.6 μm diameter spherical cap gold cavity arrays were compared. In all cases, arginine/glycine/aspartic acid (RGD) promoted capture, whereas alkanethiol monolayers inhibited adhesion. Conversely only platelets adhered to alanine/glycine/aspartic acid (AGD)-modified surfaces, indicating that the AGD motif is recognized preferentially by the platelet-specific integrin, αIIbβ3. Microstructuring of the surface effectively eliminated nonspecific platelet/cell adsorption and dramatically enhanced capture compared to RGD/AGD-modified planar surfaces. In all cases, adhesion was reversible. Platelets and cells underwent morphological change on capture, the extent of which depended on the topography of the underlying substrate. This work demonstrates that both the nature of the modified interface and its underlying topography influence the capture of cancer cells and platelets. These insights may be useful in developing cell-based cancer diagnostics as well as in identifying strategies for the disruption of platelet cloaks around circulating tumor cells.
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Affiliation(s)
- Kellie Adamson
- School of Chemical Sciences, Dublin City University , Dublin 9, Ireland
| | - Elaine Spain
- School of Chemical Sciences, Dublin City University , Dublin 9, Ireland
| | - Una Prendergast
- School of Chemical Sciences, Dublin City University , Dublin 9, Ireland
| | - Niamh Moran
- Department of Molecular and Cellular Therapeutics, Royal College of Surgeons in Ireland , Dublin 2, Ireland
| | - Robert J Forster
- School of Chemical Sciences, Dublin City University , Dublin 9, Ireland
| | - Tia E Keyes
- School of Chemical Sciences, Dublin City University , Dublin 9, Ireland
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19
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Synthesis and Application of Aurophilic Poly(Cysteine) and Poly(Cysteine)-Containing Copolymers. Polymers (Basel) 2017; 9:polym9100500. [PMID: 30965803 PMCID: PMC6418574 DOI: 10.3390/polym9100500] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 10/05/2017] [Accepted: 10/07/2017] [Indexed: 12/29/2022] Open
Abstract
The redox capacity, as well as the aurophilicity of the terminal thiol side groups, in poly(Cysteine) lend a unique characteristic to this poly(amino acid) or polypeptide. There are two major application fields for this polymer: (i) biomedical applications in drug delivery and surface modification of biomedical devices and (ii) as coating for electrodes to enhance their electrochemical sensitivity. The intended application determines the synthetic route for p(Cysteine). Polymers to be used in biomedical applications are typically polymerized from the cysteine N-carboxyanhydride by a ring-opening polymerization, where the thiol group needs to be protected during the polymerization. Advances in this methodology have led to conditions under which the polymerization progresses as living polymerization, which allows for a strict control of the molecular architecture, molecular weight and polydispersity and the formation of block copolymers, which eventually could display polyphilic properties. Poly(Cysteine) used as electrode coating is typically polymerized onto the electrode by cyclic voltammetry, which actually produces a continuous, pinhole-free film on the electrode via the formation of covalent bonds between the amino group of Cysteine and the carbon of the electrode. This resulting coating is chemically very different from the well-defined poly(Cysteine) obtained by ring-opening polymerizations. Based on the structure of cysteine a significant degree of cross-linking within the coating deposited by cyclic voltammetry can be assumed. This manuscript provides a detailed discussion of the ring-opening polymerization of cysteine, a brief consideration of the role of glutathione, a key cysteine-containing tripeptide, and examples for the utilization of poly(Cysteine) and poly(Cysteine)-containing copolymers, in both, the biomedical as well as electrochemical realm.
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20
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Wassel E, Es-Souni M, Berger N, Schopf D, Dietze M, Solterbeck CH, Es-Souni M. Nanocomposite Films of Laponite/PEG-Grafted Polymers and Polymer Brushes with Nonfouling Properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:6739-6750. [PMID: 28605897 DOI: 10.1021/acs.langmuir.7b00534] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We explore the suitability of nanocomposite thin films based on laponite nanomaterial and grafted antiadhesive polymers as transparent nonfouling surfaces. For this purpose, two polymers were chosen: a linear poly(ethylene glycol) (PEG) silane, 2-[methoxy(polyethyleneoxy)propyl]-trimethoxysilane), and thermoresponsive poly(oligo ethylene glycol)-methyl ether-methacrylate (POEGMA) brushes. PEG silane was grafted on the laponite nanoparticles in solution yielding homogeneous and transparent thin films via a dip coating procedure on glass and silicon substrates. POEGMA was grafted on laponite-(3-Aminopropyl)trimethoxysilane (APTMS) nanocomposite films that were processed similarly to PEG-silane using atom transfer radical polymerization (ATRP). Film characterization with, among others, Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and atomic force microscopy (AFM) attests to successful grafting of the polymers to the laponite nanoparticles. In particular, evidence of basal plane expansion of laponite with increasing silane concentration are obtained using XRD, while patent morphological changes are revealed with AFM. The results are discussed in terms of the different grafting sites on laponite and compared with literature. While LP-PEG-silane is easily applied to a surface from a precursor solution via a dip coating procedure LP-APTMS-OEGMA requires lots more chemicals, a thorough control of reaction parameters, and longer reaction time in order to generate films with the desirable properties. We therefore also addressed the antifouling properties of the films. These were tested together with control samples of bare glass and laponite thin films for 30 days in an algae container. More tests were conducted with fibroblast cell cultures. Our preliminary results show that grafting of PEG containing polymers and polymer brushes alters the properties of the laponite films from fouling to nonfouling surfaces. As a first estimate, the adhesion of particles (diatoms, algae, etc.) to surfaces is reduced by approximately 85% in the case of LP-PEG-silane and up to 92% in the case of LP-APTMS-POEGMA, in comparison to the control surfaces. Furthermore, practically no cell adhesion on such surfaces could be observed.
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Affiliation(s)
- Ekram Wassel
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
| | - Martha Es-Souni
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
- Cell Culture Laboratory, Clinic of Dentistry, University of Kiel , 24118 Kiel, Germany
| | - Nele Berger
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
| | - Dimitri Schopf
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
| | - Matthias Dietze
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
| | - Claus-Henning Solterbeck
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
| | - Mohammed Es-Souni
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
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21
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Müller BM, Loth R, Hoffmeister PG, Zühl F, Kalbitzer L, Hacker MC, Schulz-Siegmund M. Surface modification of copolymerized films from three-armed biodegradable macromers - An analytical platform for modified tissue engineering scaffolds. Acta Biomater 2017; 51:148-160. [PMID: 28069495 DOI: 10.1016/j.actbio.2017.01.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 12/08/2016] [Accepted: 01/05/2017] [Indexed: 01/08/2023]
Abstract
The concept of macromers allows for a broad adjustment of biomaterial properties by macromer chemistry or copolymerization. Copolymerization strategies can also be used to introduce reactive sites for subsequent surface modification. Control over surface features enables adjustment of cellular reactions with regard to site and object of implantation. We designed macromer-derived polymer films which function as non-implantable analytical substrates for the investigation of surface properties of equally composed scaffolds for bone tissue engineering. To this end, a toolbox of nine different biodegradable, three-armed macromers was thermally cross-copolymerized with poly(ethylene glycol)-methacrylate (PEG-MA) to films. Subsequent activation of PEG-hydroxyl groups with succinic anhydride and N-hydroxysuccinimid allowed for covalent surface modification. We quantified the capacity to immobilize analytes of low (amino-functionalized fluorescent dye, Fcad, and RGD-peptides) and high (alkaline phosphatase, ALP) molecular weight. Fcad grafting level was controlled by macromer chemistry, content and molecular weight of PEG-MA, but also the solvent used for film synthesis. Fcad molar amount per surface area was twentyfive times higher on high-swelling compared to low-swelling films, but differences became smaller when large ALP (appr. 2:1) were employed. Similarly, small differences were observed on RGD peptide functionalized films that were investigated by cell adhesion studies. Presentation of PEG-derivatives on surfaces was visualized by atomic force microscopy (AFM) which unraveled composition-dependent domain formation influencing fluorescent dye immobilization. Surface wetting characteristics were investigated via static water contact angle. We conclude that macromer ethoxylation and lactic acid content determined film swelling, PEG domain formation and eventually efficiency of surface decoration. STATEMENT OF SIGNIFICANCE Surfaces of implantable biomaterials are the site of interaction with a host tissue. Accordingly, modifications in the composition of the surface will determine cellular response towards the material which is crucial for the success of innovations and control of tissue regeneration. We employed a macromer approach which is most flexible for the design of biomaterials with a broad spectrum of physicochemical characteristics. For ideal analytical accessibility of the material platform, we cross-copolymerized films on solid supports. Films allowed for the covalent immobilization of fluorescent labels, peptides and enzymes and thorough analytical characterization revealed that macromer hydrophilicity is the most relevant design parameter for surface analyte presentation in these materials. All analytical results were combined in a model describing PEG linker domain formation and ligand presentation.
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Affiliation(s)
- Benno M Müller
- Pharmaceutical Technology, Institute of Pharmacy, Leipzig University, Eilenburger Straße 15a, Leipzig 04317, Germany.
| | - Rudi Loth
- Pharmaceutical Technology, Institute of Pharmacy, Leipzig University, Eilenburger Straße 15a, Leipzig 04317, Germany.
| | - Peter-Georg Hoffmeister
- Pharmaceutical Technology, Institute of Pharmacy, Leipzig University, Eilenburger Straße 15a, Leipzig 04317, Germany.
| | - Friederike Zühl
- Pharmaceutical Technology, Institute of Pharmacy, Leipzig University, Eilenburger Straße 15a, Leipzig 04317, Germany.
| | - Liv Kalbitzer
- Biophysical Chemistry, Institute of Biochemistry, Leipzig University, Johannisallee 21, Leipzig 04103, Germany.
| | - Michael C Hacker
- Pharmaceutical Technology, Institute of Pharmacy, Leipzig University, Eilenburger Straße 15a, Leipzig 04317, Germany.
| | - Michaela Schulz-Siegmund
- Pharmaceutical Technology, Institute of Pharmacy, Leipzig University, Eilenburger Straße 15a, Leipzig 04317, Germany.
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22
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Bivalent kinetic binding model to surface plasmon resonance studies of antigen-antibody displacement reactions. Anal Biochem 2017; 518:110-125. [DOI: 10.1016/j.ab.2016.11.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Revised: 11/09/2016] [Accepted: 11/17/2016] [Indexed: 12/20/2022]
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23
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Richard S, Saric A, Boucher M, Slomianny C, Geffroy F, Mériaux S, Lalatonne Y, Petit PX, Motte L. Antioxidative Theranostic Iron Oxide Nanoparticles toward Brain Tumors Imaging and ROS Production. ACS Chem Biol 2016; 11:2812-2819. [PMID: 27513597 DOI: 10.1021/acschembio.6b00558] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Gliomas are the most common primary brain tumor in humans. To date, the only treatment of care consists of surgical removal of the tumor bulk, irradiation, and chemotherapy, finally resulting in a very poor prognosis due to the lack of efficiency in diagnostics. In this context, nanomedicine combining both diagnostic and magnetic resonance imaging (MRI) and therapeutic applications is a relevant strategy referred to theranostic. Magnetic nanoparticles (NP) are excellent MRI contrast agents because of their large magnetic moment, which induces high transverse relaxivity (r2) characteristic and increased susceptibility effect (T2*). NP can be also used for drug delivery by coating their surface with therapeutic molecules. Preliminary in vitro studies show the high potential of caffeic acid (CA), a natural polyphenol, as a promising anticancer drug due to its antioxidant, anti-inflammatory, and antimetastatic properties. In this study, the antioxidative properties of iron oxide NP functionalized with caffeic acid (γFe2O3@CA NP) are investigated in vitro on U87-MG brain cancer cell lines. After intravenous injection of these NP in mice bearing a U87 glioblastoma, a negative contrast enhancement was specifically observed on 11.7 T MRI images in cancerous tissue, demonstrating a passive targeting of the tumor with these nanoplatforms.
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Affiliation(s)
- Sophie Richard
- Laboratoire CSPBAT, CNRS UMR 7244 UFR SMBH, Université Paris 13 Sorbonne Paris Cité, F-93017 Bobigny, France
| | - Ana Saric
- Laboratoire de Toxicologie, Pharmacologie et Signalisation Cellulaire,
INSERM U1124, Université Paris-Descartes, Centre Universitaire des Saints-Pères, F-75270 Paris Cedex 06, France
- Division of Molecular Medicine, Rudger Boskivic Institute, Zagreb, Croatia
| | - Marianne Boucher
- Unité d’Imagerie par Résonance
Magnétique et de Spectroscopie, CEA/DRF/I2BM/NeuroSpin, F-91191 Gif-sur-Yvette, France
| | - Christian Slomianny
- Inserm, U100, Laboratoire de Physiologie Cellulaire, Université Lille 1, F-59655 Villeneuve d’Ascq, France
| | - Françoise Geffroy
- Unité d’Imagerie par Résonance
Magnétique et de Spectroscopie, CEA/DRF/I2BM/NeuroSpin, F-91191 Gif-sur-Yvette, France
| | - Sébastien Mériaux
- Unité d’Imagerie par Résonance
Magnétique et de Spectroscopie, CEA/DRF/I2BM/NeuroSpin, F-91191 Gif-sur-Yvette, France
| | - Yoann Lalatonne
- Inserm, U1148, Laboratory for Vascular Translational
Science, UFR SMBH, Université Paris 13, Sorbonne Paris Cité, F-93017 Bobigny, France
- Service de Médecine Nucléaire, Hôpital Avicenne
Assistance Publique-Hôpitaux de Paris, F-93009 Bobigny, France
| | - Patrice X. Petit
- Laboratoire de Toxicologie, Pharmacologie et Signalisation Cellulaire,
INSERM U1124, Université Paris-Descartes, Centre Universitaire des Saints-Pères, F-75270 Paris Cedex 06, France
| | - Laurence Motte
- Inserm, U1148, Laboratory for Vascular Translational
Science, UFR SMBH, Université Paris 13, Sorbonne Paris Cité, F-93017 Bobigny, France
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24
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Integrated hollow microneedle-optofluidic biosensor for therapeutic drug monitoring in sub-nanoliter volumes. Sci Rep 2016; 6:29075. [PMID: 27380889 PMCID: PMC4933911 DOI: 10.1038/srep29075] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 06/10/2016] [Indexed: 12/02/2022] Open
Abstract
Therapeutic drug monitoring (TDM) typically requires painful blood drawn from patients. We propose a painless and minimally-invasive alternative for TDM using hollow microneedles suitable to extract extremely small volumes (<1 nL) of interstitial fluid to measure drug concentrations. The inner lumen of a microneedle is functionalized to be used as a micro-reactor during sample collection to trap and bind target drug candidates during extraction, without requirements of sample transfer. An optofluidic device is integrated with this microneedle to rapidly quantify drug analytes with high sensitivity using a straightforward absorbance scheme. Vancomycin is currently detected by using volumes ranging between 50–100 μL with a limit of detection (LoD) of 1.35 μM. The proposed microneedle-optofluidic biosensor can detect vancomycin with a sample volume of 0.6 nL and a LoD of <100 nM, validating this painless point of care system with significant potential to reduce healthcare costs and patients suffering.
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Szczepanowicz K, Bzowska M, Kruk T, Karabasz A, Bereta J, Warszynski P. Pegylated polyelectrolyte nanoparticles containing paclitaxel as a promising candidate for drug carriers for passive targeting. Colloids Surf B Biointerfaces 2016; 143:463-471. [DOI: 10.1016/j.colsurfb.2016.03.064] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 03/21/2016] [Accepted: 03/22/2016] [Indexed: 10/22/2022]
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26
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Noel S, Fortier C, Murschel F, Belzil A, Gaudet G, Jolicoeur M, De Crescenzo G. Co-immobilization of adhesive peptides and VEGF within a dextran-based coating for vascular applications. Acta Biomater 2016; 37:69-82. [PMID: 27039978 DOI: 10.1016/j.actbio.2016.03.043] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Revised: 02/11/2016] [Accepted: 03/30/2016] [Indexed: 11/25/2022]
Abstract
UNLABELLED Multifunctional constructs providing a proper environment for adhesion and growth of selected cell types are needed for most tissue engineering and regenerative medicine applications. In this context, vinylsulfone (VS)-modified dextran was proposed as a matrix featuring low-fouling properties as well as multiple versatile moieties. The displayed VS groups could indeed react with thiol, amine or hydroxyl groups, be it for surface grafting, crosslinking or subsequent tethering of biomolecules. In the present study, a library of dextran-VS was produced, grafted to aminated substrates and characterized in terms of degree of VS modification (%VS), cell-repelling properties and potential for the oriented grafting of cysteine-tagged peptides. As a bioactive coating of vascular implants, ECM peptides (e.g. RGD) as well as vascular endothelial growth factor (VEGF) were co-immobilized on one of the most suitable dextran-VS coating (%VS=ca. 50% of saccharides units). Both RGD and VEGF were efficiently tethered at high densities (ca. 1nmol/cm(2) and 50fmol/cm(2), respectively), and were able to promote endothelial cell adhesion as well as proliferation. The latter was enhanced to the same extent as with soluble VEGF and proved selective to endothelial cells over smooth muscle cells. Altogether, multiple biomolecules could be efficiently incorporated into a dextran-VS construct, while maintaining their respective biological activity. STATEMENT OF SIGNIFICANCE This work addresses the need for multifunctional coatings and selective cell response inherent to many tissue engineering and regenerative medicine applications, for instance, vascular graft. More specifically, a library of dextrans was first generated through vinylsulfone (VS) modification. Thoroughly selected dextran-VS provided an ideal platform for unbiased study of cell response to covalently grafted biomolecules. Considering that processes such as healing and angiogenesis require multiple factors acting synergistically, vascular endothelial growth factor (VEGF) was then co-immobilized with the cell adhesive RGD peptide within our dextran coating through a relevant strategy featuring orientation and specificity. Altogether, both adhesive and proliferative cues could be incorporated into our construct with additive, if not synergetic, effects.
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27
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Chan JW, Huang A, Uhrich KE. Self-Assembled Amphiphilic Macromolecule Coatings: Comparison of Grafting-From and Grafting-To Approaches for Bioactive Delivery. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:5038-5047. [PMID: 27167872 DOI: 10.1021/acs.langmuir.6b00524] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Although drug-eluting stent technologies have significantly improved clinical outcomes over the past decade, substantial issues with postimplantation vessel reocclusion still remain. To combat these issues, bioactive amphiphilic macromolecules (AMs), comprised of a functional end group, a branched hydrophobic domain, and a hydrophilic poly(ethylene glycol) tail, were investigated as a therapeutic coating to reduce smooth muscle cell (SMC) proliferation and platelet adhesion. In this study, grafting-from and grafting-to approaches for AM surface functionalization were compared to determine the effects of fabrication method on bioactive delivery characteristics, including the AM loading, release, and biological activity. Grafted-from coatings were formed by stepwise synthesis of phosphonate AMs, 1pM, on the substrate, first by alkyl phosphonate coordination to stainless steel and subsequent carbodiimide coupling to conjugate the hydrophobic and hydrophilic domains. In contrast, grafted-to monolayers were assembled utilizing presynthesized 1pM in a tethering by aggregation and growth technique. Coatings formed using the grafting-from approach yielded high AM grafting density and a highly ordered layer, which corresponded to a slower release rate and sustained bioactivity over 28 days. In contrast, the grafted-to coatings yielded less dense, heterogeneous layers, which released faster and were therefore less efficacious in suppressing prolonged SMC proliferation. Both coatings significantly reduced platelet adhesion compared to an uncoated control, but similar platelet adhesion results between grafted-from and grafted-to coatings suggest that both surfaces maintained a molecular density favorable for antiplatelet activity. Overall, the grafting-from method produced uniform coatings with improved loading, release, and bioactive properties compared to the grafting-to approach, highlighting the potential of AM controlled release coatings for therapeutic delivery.
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Affiliation(s)
- Jennifer W Chan
- Department of Biomedical Engineering, Rutgers University , 599 Taylor Road, Piscataway, New Jersey 08854, United States
| | - Amy Huang
- Ernest Mario School of Pharmacy, Rutgers University , 160 Frelinghuysen Road, Piscataway, New Jersey 08854, United States
| | - Kathryn E Uhrich
- Department of Biomedical Engineering, Rutgers University , 599 Taylor Road, Piscataway, New Jersey 08854, United States
- Ernest Mario School of Pharmacy, Rutgers University , 160 Frelinghuysen Road, Piscataway, New Jersey 08854, United States
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28
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Dragneva N, Rubel O, Floriano WB. Molecular Dynamics of Fibrinogen Adsorption onto Graphene, but Not onto Poly(ethylene glycol) Surface, Increases Exposure of Recognition Sites That Trigger Immune Response. J Chem Inf Model 2016; 56:706-20. [DOI: 10.1021/acs.jcim.5b00703] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Nadiya Dragneva
- Thunder Bay Regional Research Institute, 290 Munro Street, Thunder Bay, Ontario P7A 7T1, Canada
- Biotechnology
Ph.D. Program, Faculty of Science and Environment Studies, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada
| | - Oleg Rubel
- Thunder Bay Regional Research Institute, 290 Munro Street, Thunder Bay, Ontario P7A 7T1, Canada
- Department
of Materials Science and Engineering, McMaster University, 1280 Main
Street West, Hamilton, Ontario L8S 4L8, Canada
| | - Wely B. Floriano
- Thunder Bay Regional Research Institute, 290 Munro Street, Thunder Bay, Ontario P7A 7T1, Canada
- Biotechnology
Ph.D. Program, Faculty of Science and Environment Studies, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada
- Department
of Chemistry, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada
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29
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Gurunatha KL, Marvi S, Arya G, Tao AR. Computationally Guided Assembly of Oriented Nanocubes by Modulating Grafted Polymer-Surface Interactions. NANO LETTERS 2015; 15:7377-7382. [PMID: 26457977 DOI: 10.1021/acs.nanolett.5b02748] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The bottom-up fabrication of ordered and oriented colloidal nanoparticle assemblies is critical for engineering functional nanomaterials beyond conventional polymer-particle composites. Here, we probe the influence of polymer surface ligands on the self-orientation of shaped metal nanoparticles for the formation of nanojunctions. We examine how polymer graft-surface interactions dictate Ag nanocube orientation into either edge-edge or face-face nanojunctions. Specifically, we investigate the effect of end-functionalized polymer grafts on nanocube assembly outcomes, such as interparticle angle and interparticle distance. Our assembly results can be directly mapped onto our theoretical phase diagrams for nanocube orientation, enabling correlation of experimental variables (such as graft length and metal binding strength) with computational parameters. These results represent an important step toward unifying modeling and experimental approaches to understanding nanoparticle-polymer self-assembly.
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Affiliation(s)
- Kargal L Gurunatha
- NanoEngineering Department, University of California, San Diego , 9500 Gilman Drive MC 0448, La Jolla, California 92093-0448, United States
| | - Sarrah Marvi
- NanoEngineering Department, University of California, San Diego , 9500 Gilman Drive MC 0448, La Jolla, California 92093-0448, United States
| | - Gaurav Arya
- NanoEngineering Department, University of California, San Diego , 9500 Gilman Drive MC 0448, La Jolla, California 92093-0448, United States
| | - Andrea R Tao
- NanoEngineering Department, University of California, San Diego , 9500 Gilman Drive MC 0448, La Jolla, California 92093-0448, United States
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30
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Overview of PES biocompatible/hemodialysis membranes: PES–blood interactions and modification techniques. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 56:574-92. [DOI: 10.1016/j.msec.2015.06.035] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2014] [Revised: 05/19/2015] [Accepted: 06/15/2015] [Indexed: 01/13/2023]
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31
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Biocompatible long-sustained release oil-core polyelectrolyte nanocarriers: From controlling physical state and stability to biological impact. Adv Colloid Interface Sci 2015; 222:678-91. [PMID: 25453660 DOI: 10.1016/j.cis.2014.10.005] [Citation(s) in RCA: 105] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 10/15/2014] [Accepted: 10/15/2014] [Indexed: 11/20/2022]
Abstract
It has been generally expected that the most applicable drug delivery system (DDS) should be biodegradable, biocompatible and with incidental adverse effects. Among many micellar aggregates and their mediated polymeric systems, polyelectrolyte oil-core nanocarriers have been found to successfully encapsulate hydrophobic drugs in order to target cells and avoid drug degradation and toxicity as well as to improve drug efficacy, its stability, and better intracellular penetration. This paper reviews recent developments in the formation of polyelectrolyte oil-core nanocarriers by subsequent multilayer adsorption at micellar structures, their imaging, physical state and stability, drug encapsulation and applications, in vitro release profiles and in vitro biological evaluation (cellular uptake and internalization, biocompatibility). We summarize the recent results concerning polyelectrolyte/surfactant interactions at interfaces, fundamental to understand the mechanisms of formation of stable polyelectrolyte layered structures on liquid cores. The fabrication of emulsion droplets stabilized by synergetic surfactant/polyelectrolyte complexes, properties, and potential applications of each type of polyelectrolyte oil-core nanocarriers, including stealth nanocapsules with pegylated shell, are discussed and evaluated.
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32
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Chan JW, Zhang Y, Uhrich KE. Amphiphilic Macromolecule Self-Assembled Monolayers Suppress Smooth Muscle Cell Proliferation. Bioconjug Chem 2015; 26:1359-69. [PMID: 26042535 DOI: 10.1021/acs.bioconjchem.5b00208] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A significant limitation of cardiovascular stents is restenosis, where excessive smooth muscle cell (SMC) proliferation following stent implantation causes blood vessel reocclusion. While drug-eluting stents minimize SMC proliferation through releasing cytotoxic or immunosuppressive drugs from polymer carriers, significant issues remain with delayed healing, inflammation, and hypersensitivity reactions associated with drug and polymer coatings. Amphiphilic macromolecules (AMs) comprising a sugar-based hydrophobic domain and a hydrophilic poly(ethylene glycol) tail are noncytotoxic and recently demonstrated a concentration-dependent ability to suppress SMC proliferation. In this study, we designed a series of AMs and studied their coating properties (chemical composition, thickness, grafting density, and coating uniformity) to determine the effect of headgroup chemistry on bioactive AM grafting and release properties from stainless steel substrates. One carboxyl-terminated AM (1cM) and two phosphonate- (Me-1pM and Pr-1pM) terminated AMs, with varying linker lengths preceding the hydrophobic domain, were grafted to stainless steel substrates using the tethering by aggregation and growth (T-BAG) approach. The AMs formed headgroup-dependent, yet uniform, biocompatible adlayers. Pr-1pM and 1cM demonstrated higher grafting density and an extended release from the substrate over 21 days compared to Me-1pM, which exhibited lower grafting density and complete release within 7 days. Coinciding with their release profiles, Me-1pM and 1cM coatings initially suppressed SMC proliferation in vitro, but their efficacy decreased within 7 and 14 days, respectively, while Pr-1pM coatings suppressed SMC proliferation over 21 days. Thus, AMs with phosphonate headgroups and propyl linkers are capable of sustained release from the substrate and have the ability to suppress SMC proliferation during the restenosis that occurs in the 3-4 weeks after stent implantation, demonstrating the potential for AM coatings to provide sustained delivery via desorption from coated coronary stents and other metal-based implants.
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Affiliation(s)
- Jennifer W Chan
- †Department of Biomedical Engineering, Rutgers University, 599 Taylor Road, Piscataway, New Jersey 08854, United States
| | - Yingyue Zhang
- ‡Department of Chemistry and Chemical Biology, Rutgers University, 610 Taylor Road, Piscataway, New Jersey 08854, United States
| | - Kathryn E Uhrich
- †Department of Biomedical Engineering, Rutgers University, 599 Taylor Road, Piscataway, New Jersey 08854, United States.,‡Department of Chemistry and Chemical Biology, Rutgers University, 610 Taylor Road, Piscataway, New Jersey 08854, United States
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33
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Noel S, Hachem A, Merhi Y, De Crescenzo G. Development of a Polyester Coating Combining Antithrombogenic and Cell Adhesive Properties: Influence of Sequence and Surface Density of Adhesion Peptides. Biomacromolecules 2015; 16:1682-94. [DOI: 10.1021/acs.biomac.5b00219] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Samantha Noel
- Department
of Chemical Engineering, Groupe de Recherche en Sciences et Technologies
Biomédicales, Bio-P2 Research Unit, École Polytechnique de Montréal, P.O. Box 6079, succ. Centre-Ville, Montréal (QC), Canada H3C 3A7
| | - Ahmed Hachem
- Université de Montréal, Montreal Heart Institute, 5000 Belanger Est, Montréal (QC), Canada H1T 1C8
| | - Yahye Merhi
- Université de Montréal, Montreal Heart Institute, 5000 Belanger Est, Montréal (QC), Canada H1T 1C8
| | - Gregory De Crescenzo
- Department
of Chemical Engineering, Groupe de Recherche en Sciences et Technologies
Biomédicales, Bio-P2 Research Unit, École Polytechnique de Montréal, P.O. Box 6079, succ. Centre-Ville, Montréal (QC), Canada H3C 3A7
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34
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Liu Y, Wu D, Zhang K, Yin XS, Yang WZ. Narrow-disperse highly cross-linked “living” polymer microspheres by two-stage precipitation polymerization. CHINESE JOURNAL OF POLYMER SCIENCE 2015. [DOI: 10.1007/s10118-015-1595-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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35
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Solano I, Parisse P, Gramazio F, Cavalleri O, Bracco G, Castronovo M, Casalis L, Canepa M. Spectroscopic ellipsometry meets AFM nanolithography: about hydration of bio-inert oligo(ethylene glycol)-terminated self assembled monolayers on gold. Phys Chem Chem Phys 2015; 17:28774-81. [PMID: 26445913 DOI: 10.1039/c5cp04028k] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
An accurate thickness determination provides insight into the complex vertical morphology of OEG-terminated SAMs.
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Affiliation(s)
- Ilaria Solano
- Dipartimento di Fisica
- Università di Genova and CNISM
- Genova
- Italy
| | | | | | | | | | - Matteo Castronovo
- Department of Medical and Biological Sciences – University of Udine
- Udine
- Italy
| | | | - Maurizio Canepa
- Dipartimento di Fisica
- Università di Genova and CNISM
- Genova
- Italy
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36
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Blaszykowski C, Sheikh S, Thompson M. A survey of state-of-the-art surface chemistries to minimize fouling from human and animal biofluids. Biomater Sci 2015. [DOI: 10.1039/c5bm00085h] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Fouling of artificial surfaces by biofluids is a plague Biotechnology deeply suffers from. Herein, we inventory the state-of-the-art surface chemistries developed to minimize this effect from both human and animal biosamples.
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Affiliation(s)
| | - Sonia Sheikh
- University of Toronto
- Department of Chemistry – St. George campus
- Toronto
- Canada M5S 3H6
| | - Michael Thompson
- Econous Systems Inc
- Toronto
- Canada M5S 3H6
- University of Toronto
- Department of Chemistry – St. George campus
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37
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Chong JY, Mulet X, Boyd BJ, Drummond CJ. Steric Stabilizers for Cubic Phase Lyotropic Liquid Crystal Nanodispersions (Cubosomes). ADVANCES IN PLANAR LIPID BILAYERS AND LIPOSOMES 2015. [DOI: 10.1016/bs.adplan.2014.11.001] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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38
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Schuster S, Yu W, Nega M, Chu YY, Zorn S, Zhang F, Götz F, Schreiber F. The role of serum proteins in Staphylococcus aureus adhesion to ethylene glycol coated surfaces. Int J Med Microbiol 2014; 304:949-57. [DOI: 10.1016/j.ijmm.2014.05.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 03/24/2014] [Accepted: 05/31/2014] [Indexed: 01/22/2023] Open
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39
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Vaish A, Vanderah DJ, Vierling R, Crawshaw F, Gallagher DT, Walker ML. Membrane protein resistance of oligo(ethylene oxide) self-assembled monolayers. Colloids Surf B Biointerfaces 2014; 122:552-558. [PMID: 25124834 DOI: 10.1016/j.colsurfb.2014.07.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 07/11/2014] [Accepted: 07/19/2014] [Indexed: 10/25/2022]
Abstract
As part of an effort to develop biointerfaces for structure-function studies of integral membrane proteins (IMPs) a series of oligo(ethylene oxide) self-assembled monolayers (OEO-SAMs) were evaluated for their resistance to protein adsorption (RPA) of IMPs on Au and Pt. Spectroscopic ellipsometry (SE) was used to determine SAM thicknesses and compare the RPA of HS(CH2)3O(CH2CH2O)6CH3 (1), HS(CH2)3O(CH2CH2O)6H (2), [HS(CH2)3]2CHO(CH2CH2O)6CH3 (3) and [HS(CH2)3]2CHO(CH2CH2O)6H (4), assembled from water. For both substrates, SAM thicknesses for 1 to 4 were found to be comparable indicating SAMs with similar surface coverages and OEO chain order and packing densities. Fibrinogen (Fb), a soluble plasma protein, and rhodopsin (Rd), an integral membrane G-protein coupled receptor, adsorbed to the SAMs of 1, as expected from previous reports, but not to the hydroxy-terminated SAMs of 2 and 4. The methoxy-terminated SAMs of 3 were resistant to Fb but, surprisingly, not to Rd. The stark difference between the adsorption of Rd to the SAMs of 3 and 4 clearly indicate that a hydroxy-terminus of the OEO chain is essential for high RPA of IMPs. The similar thicknesses and high RPA of the SAMs of 2 and 4 show the conditions of protein resistance (screening the underlying substrate, packing densities, SAM order, and conformational mobility of the OEO chains) defined from previous studies on Au are applicable to Pt. In addition, the SAMs of 4, exhibiting the highest resistance to Fb and Rd, were placed in contact with undiluted fetal bovine serum for 2h. Low protein adsorption (≈12.4ng/cm(2)), obtained under these more challenging conditions, denote a high potential of the SAMs of 4 for various applications requiring the suppression of non-specific protein adsorption.
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Affiliation(s)
- Amit Vaish
- National Institute of Standards and Technology (NIST) Center for Neutron Research, Gaithersburg, MD 20899, USA; Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
| | - David J Vanderah
- Biomolecular Measurement Division, Material Measurement Laboratory, NIST, Gaithersburg, MD 20899, USA; Institute for Bioscience and Biotechnology Research (IBBR), Rockville, MD 20850, USA.
| | - Ryan Vierling
- Biomolecular Measurement Division, Material Measurement Laboratory, NIST, Gaithersburg, MD 20899, USA; Institute for Bioscience and Biotechnology Research (IBBR), Rockville, MD 20850, USA
| | - Fay Crawshaw
- Biomolecular Measurement Division, Material Measurement Laboratory, NIST, Gaithersburg, MD 20899, USA; Institute for Bioscience and Biotechnology Research (IBBR), Rockville, MD 20850, USA
| | - D Travis Gallagher
- Biomolecular Measurement Division, Material Measurement Laboratory, NIST, Gaithersburg, MD 20899, USA; Institute for Bioscience and Biotechnology Research (IBBR), Rockville, MD 20850, USA
| | - Marlon L Walker
- Materials Measurement Science Division, Material Measurement Laboratory, NIST, Gaithersburg, MD 20899, USA.
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40
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Röttgermann PJF, Hertrich S, Berts I, Albert M, Segerer FJ, Moulin JF, Nickel B, Rädler JO. Cell Motility on Polyethylene Glycol Block Copolymers Correlates to Fibronectin Surface Adsorption. Macromol Biosci 2014; 14:1755-63. [DOI: 10.1002/mabi.201400246] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Revised: 08/13/2014] [Indexed: 01/27/2023]
Affiliation(s)
- Peter J. F. Röttgermann
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Samira Hertrich
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Ida Berts
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Max Albert
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Felix J. Segerer
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Jean-François Moulin
- Helmholtz Zentrum Geesthacht; Institut für Werkstoffforschung; FRM II; Lichtenbergstr. 1 85747 Garching Germany
| | - Bert Nickel
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Joachim O. Rädler
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
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41
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Zhang D, Kilian KA. Peptide microarrays for the discovery of bioactive surfaces that guide cellular processes: a single step azide-alkyne "click" chemistry approach. J Mater Chem B 2014; 2:4280-4288. [PMID: 32261566 DOI: 10.1039/c4tb00375f] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Cell behavior in vivo is guided by a complex microenvironment containing many different molecules including extracellular matrix (ECM) proteins, growth factors, and proteoglycans. Controlling the interaction between these various components at the cell-material interface will be invaluable in developing new materials for biomedical devices and tissue engineering applications. We report a single step approach to forming mixed peptide conjugated self-assembled monolayers on gold using copper-catalyzed azide-alkyne cycloaddition chemistry to study the combinatorial effects of different peptide ligands on cellular processes. We synthesized ECM adhesion peptides (YIGSR, GRGDS), a bone morphogenetic protein 7 (BMP-7) derived peptide (KPSSAPTQLN), and a heparin binding peptide (KRSR), and arrayed them, alone and in combination, onto gold coated coverslips. SAMs were characterized by X-ray photoelectron spectroscopy (XPS) and matrix-assisted laser desorption/ionization (MALDI) mass spectrometry, and arrayed peptide combinations were seen to differentially bind to adipose derived stem cells (ADSCs) and mouse embryonic fibroblasts (MEFs). We further investigated the osteogenesis of ADSCs on SAMs containing combinations of adhesion peptide and BMP-7 peptide in both standard culture and osteogenic differentiation media. We demonstrate enhanced expression of osteogenic markers Runx2 and osteopontin when ADSCs are adherent to BMP-7 derived peptide alone or in combination with ECM adhesion peptides. The platform presented here enables immobilization of multiple peptides in a single step using a commercially available microarray spotter which will prove useful in fabricating biomolecule interfaces for cell biology studies and biochemical assays.
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Affiliation(s)
- Douglas Zhang
- Department of Materials Science and Engineering, University of Illinois, Urbana-Champaign, Illinois 61801, USA.
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42
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Minner DE, Rauch P, Käs J, Naumann CA. Polymer-tethered lipid multi-bilayers: a biomembrane-mimicking cell substrate to probe cellular mechano-sensing. SOFT MATTER 2014; 10:1189-1198. [PMID: 24652490 DOI: 10.1039/c3sm52298a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Cells tiptoe through their environment forming highly localized and dynamic focal contacts. Experiments on polymeric gels of adjustable elasticity have shown that cells probe the viscoelasticity of their environment through an adaptive process of focal contact assembly/disassembly that critically affects cell adhesion, morphology, and motility. However, the specific mechanisms of this process have not yet been fully revealed. Here we report, for the first time, that fibroblast adhesion, morphology, and migration can also be controlled by altering the number of bilayers in a stack of multiple polymer-tethered lipid bilayers stabilized via maleimide-sulfhydral coupling chemistry. The observed changes in cell morphology, migration, and cytoskeletal organization in response to bilayer stacking correspond well with those previously observed on polymeric substrates of different polymer crosslinking density suggesting that variations in bilayer stacking are associated with changes in substrate viscoelasticity. This is in conceptual agreement with the existing knowledge about the structural, dynamic, and mechanical properties of polymer-lipid composite materials. Several distinct features, such as the lateral mobility of individual cell linkers and the immobilization of linker clusters, make the described substrates highly attractive tools for the study of dynamic, mechano-regulated cell linkages and cellular mechano-sensing.
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Affiliation(s)
- Daniel E Minner
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202-3274, USA.
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43
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Adamson K, Spain E, Prendergast U, Forster RJ, Moran N, Keyes TE. Ligand capture and activation of human platelets at monolayer modified gold surfaces. Biomater Sci 2014; 2:1509-1520. [DOI: 10.1039/c4bm00241e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The effect of RGD peptides, alkane and PEG in self assembled mixed monolayers on gold on platelet adhesion and activation is explored.
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Affiliation(s)
- Kellie Adamson
- School of Chemical Sciences
- Dublin City University
- Dublin 9, Ireland
- Department of Molecular and Cellular Therapeutics
- Royal College of Surgeons in Ireland
| | - Elaine Spain
- School of Chemical Sciences
- Dublin City University
- Dublin 9, Ireland
| | - Una Prendergast
- School of Chemical Sciences
- Dublin City University
- Dublin 9, Ireland
| | | | - Niamh Moran
- Department of Molecular and Cellular Therapeutics
- Royal College of Surgeons in Ireland
- Dublin 2, Ireland
| | - Tia E. Keyes
- School of Chemical Sciences
- Dublin City University
- Dublin 9, Ireland
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44
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Borozenko O, Ou C, Skene WG, Giasson S. Polystyrene-block-poly(acrylic acid) brushes grafted from silica surfaces: pH- and salt-dependent switching studies. Polym Chem 2014. [DOI: 10.1039/c3py01339a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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45
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Egea AMC, Trévisiol E, Vieu C. Direct patterning of probe proteins on an antifouling PLL-g-dextran coating for reducing the background signal of fluorescent immunoassays. Biointerphases 2013; 8:37. [DOI: 10.1186/1559-4106-8-37] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Accepted: 09/23/2013] [Indexed: 11/10/2022] Open
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46
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Chen M, Yu Q, Sun H. Novel strategies for the prevention and treatment of biofilm related infections. Int J Mol Sci 2013; 14:18488-501. [PMID: 24018891 PMCID: PMC3794791 DOI: 10.3390/ijms140918488] [Citation(s) in RCA: 233] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Revised: 08/28/2013] [Accepted: 08/30/2013] [Indexed: 02/06/2023] Open
Abstract
Biofilm formation by human bacterial pathogens on implanted medical devices causes major morbidity and mortality among patients, and leads to billions of dollars in healthcare cost. Biofilm is a complex bacterial community that is highly resistant to antibiotics and human immunity. As a result, novel therapeutic solutions other than the conventional antibiotic therapies are in urgent need. In this review, we will discuss the recent research in discovery of alternative approaches to prevent or treat biofilms. Current anti-biofilm technologies could be divided into two groups. The first group focuses on targeting the biofilm forming process of bacteria based on our understanding of the molecular mechanism of biofilm formation. Small molecules and enzymes have been developed to inhibit or disrupt biofilm formation. Another group of anti-biofilm technologies focuses on modifying the biomaterials used in medical devices to make them resistant to biofilm formation. While these novel anti-biofilm approaches are still in nascent phases of development, efforts devoted to these technologies could eventually lead to anti-biofilm therapies that are superior to the current antibiotic treatment.
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Affiliation(s)
- Meng Chen
- Nanova, Inc. Columbia, MO 65211, USA; E-Mail: or
| | - Qingsong Yu
- Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211, USA; E-Mail:
| | - Hongmin Sun
- Division of Cardiovascular Medicine, Department of Internal Medicine, University of Missouri, Columbia, MO 65212, USA
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +1-573-884-1964; Fax: +1-573-884-7743
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47
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Alluri C, Ji HF, Sit PS. Strong resistance of (tridecafluoro-1,1,2,2-tetrahydrooctyl)triethoxysilane (TTS) nanofilm to protein adsorption. Biotechnol Appl Biochem 2013; 60:494-501. [PMID: 23826851 DOI: 10.1002/bab.1136] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Accepted: 06/14/2013] [Indexed: 12/25/2022]
Abstract
In this report, the properties of fluorocarbon-containing (tridecafluoro-1,1,2,2-tetrahydrooctyl)triethoxysilane (TTS) (C14 H19 F13 O3 Si) nanofilm coated on silicon surface and its potential to resist protein adsorption were examined. Thickness and wettability of the silicon surface before and after TTS nanofilm coating were examined by ellipsometry and contact angle goniometry, respectively. The same techniques were used to examine protein layer on nonmodified and TTS-coated silicon surface. In addition, bright-field optical microscopy and fluorescence spectrophotometry were used to provide visual, qualitative description of adsorbed proteins and the specific signal of fluorescence-labeled bovine serum albumin (BSA), respectively, on bare and TTS-coated silicon surface. Single-component protein solution of four model proteins, namely BSA, human fibrinogen, bovine serum immunoglobulin G, and fibronectin, was prepared, and the adsorption responses of these four proteins on TTS nanofilm were examined, using nonmodified silicon surface as comparison. TTS substantially reduces the adsorption of all four proteins tested. Our results indicate that fluorocarbon-containing TTS, once coated on surfaces, is an effective molecule for resisting protein adsorption. This will open up potential applications, particularly for silicon-containing implant devices such as glass.
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Affiliation(s)
- Chandrakanth Alluri
- Biomedical Engineering Program, Louisiana Tech University, Ruston, LA, USA; Institute for Micromanufacturing, Louisiana Tech University, Ruston, LA, USA
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48
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Muth CA, Steinl C, Klein G, Lee-Thedieck C. Regulation of hematopoietic stem cell behavior by the nanostructured presentation of extracellular matrix components. PLoS One 2013; 8:e54778. [PMID: 23405094 PMCID: PMC3566109 DOI: 10.1371/journal.pone.0054778] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Accepted: 12/18/2012] [Indexed: 01/16/2023] Open
Abstract
Hematopoietic stem cells (HSCs) are maintained in stem cell niches, which regulate stem cell fate. Extracellular matrix (ECM) molecules, which are an essential part of these niches, can actively modulate cell functions. However, only little is known on the impact of ECM ligands on HSCs in a biomimetic environment defined on the nanometer-scale level. Here, we show that human hematopoietic stem and progenitor cell (HSPC) adhesion depends on the type of ligand, i.e., the type of ECM molecule, and the lateral, nanometer-scaled distance between the ligands (while the ligand type influenced the dependency on the latter). For small fibronectin (FN)-derived peptide ligands such as RGD and LDV the critical adhesive interligand distance for HSPCs was below 45 nm. FN-derived (FN type III 7-10) and osteopontin-derived protein domains also supported cell adhesion at greater distances. We found that the expression of the ECM protein thrombospondin-2 (THBS2) in HSPCs depends on the presence of the ligand type and its nanostructured presentation. Functionally, THBS2 proved to mediate adhesion of HSPCs. In conclusion, the present study shows that HSPCs are sensitive to the nanostructure of their microenvironment and that they are able to actively modulate their environment by secreting ECM factors.
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Affiliation(s)
- Christine Anna Muth
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems, Stuttgart, Germany
- Department of Biophysical Chemistry, University of Heidelberg, Heidelberg, Germany
| | - Carolin Steinl
- Section for Transplantation Immunology and Immunohematology, Center for Medical Research, University of Tübingen, Tübingen, Germany
| | - Gerd Klein
- Section for Transplantation Immunology and Immunohematology, Center for Medical Research, University of Tübingen, Tübingen, Germany
| | - Cornelia Lee-Thedieck
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems, Stuttgart, Germany
- Department of Biophysical Chemistry, University of Heidelberg, Heidelberg, Germany
- Institute of Functional Interfaces, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany
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49
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Boardman AK, Allison S, Sharon A, Sauer-Budge AF. Comparison of anti-fouling surface coatings for applications in bacteremia diagnostics. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2013; 5:273-280. [PMID: 25147402 PMCID: PMC4137785 DOI: 10.1039/c2ay25662b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
To accurately diagnose microbial infections in blood, it is essential to recover as many microorganisms from a sample as possible. Unfortunately, recovering such microorganisms depends significantly on their adhesion to the surfaces of diagnostic devices. Consequently, we sought to minimize the adhesion of methicillin-sensitive Staphylococcus aureus (MSSA) to the surface of polypropylene- and acrylic-based bacteria concentration devices. These devices were treated with 11 different coatings having various charges and hydrophobicities. Some coatings promoted bacterial adhesion under centrifugation, whereas others were more likely to prevent it. Experiments were run using a simple buffer system and lysed blood, both inoculated with MSSA. Under both conditions, Hydromer's 7-TS-13 and Aqua65JL were most effective at reducing bacterial adhesion.
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Affiliation(s)
- Anna K. Boardman
- Center for Manufacturing Innovation, Fraunhofer USA, Brookline, MA 02446, USA
| | - Sandra Allison
- Center for Manufacturing Innovation, Fraunhofer USA, Brookline, MA 02446, USA
| | - Andre Sharon
- Center for Manufacturing Innovation, Fraunhofer USA, Brookline, MA 02446, USA
- Department of Mechanical Engineering, Boston University, Boston, MA 02215, USA
| | - Alexis F. Sauer-Budge
- Center for Manufacturing Innovation, Fraunhofer USA, Brookline, MA 02446, USA
- Department of Biomedical Engineering, Boston University, Boston, MA 02215, USA
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50
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Gao B, Alvi Y, Rosen D, Lav M, Tao AR. Designer nanojunctions: orienting shaped nanoparticles within polymer thin-film nanocomposites. Chem Commun (Camb) 2013; 49:4382-4. [DOI: 10.1039/c2cc37158h] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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