1
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Iijima K, Kaji N, Tokeshi M, Baba Y. Micro- and nanochamber array system for single enzyme assays. Sci Rep 2023; 13:13322. [PMID: 37587179 PMCID: PMC10432523 DOI: 10.1038/s41598-023-40544-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 08/12/2023] [Indexed: 08/18/2023] Open
Abstract
Arrays of small reaction containers, ranging from 624 femtoliters (10-15 L) to 270 attoliters (10-18 L), for capturing a single enzyme molecule and measuring the activity were developed along with a new reversible sealing system based on a pneumatic valve actuator made of polydimethylsiloxane (PDMS). The valve was actuated by PBS solution, effectively preventing evaporation of the solution from the micro- and nanochambers and allowing the assay to be performed over a long period of time. The hydrolysis rates of β-D-galactosidase (β-gal), kcat, were decreased according to the decrease of the chamber size, and the overall tendency seems to be symmetrically related to the specific surface area of the chambers even under the prevented condition of non-specific adsorption. The spatial localization of the protons in the chambers, which might could affect the dissociation state of the proteins, was also investigated to explain the decrease in the hydrolysis rate. The developed chamber system developed here may be useful for artificially reproducing the confined intracellular environment and molecular crowding conditions.
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Affiliation(s)
- Kazuki Iijima
- Department of Biomolecular Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
| | - Noritada Kaji
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
- Institute of Nano-Life-Systems, Institutes of Innovation for Future Society, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan.
| | - Manabu Tokeshi
- Institute of Nano-Life-Systems, Institutes of Innovation for Future Society, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-Ku, Sapporo, 060-8628, Japan
| | - Yoshinobu Baba
- Department of Biomolecular Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
- Institute of Nano-Life-Systems, Institutes of Innovation for Future Society, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
- Institute for Quantum Life Science, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, Chiba, 263-8555, Japan
- School of Pharmacy, College of Pharmacy, Kaohsiung Medical University, 100, Shih-Chuan 1st Rd., Kaohsiung, 807, Taiwan, ROC
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2
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Hashimoto K, Morisawa Y, Tortora M, Rossi B, Ozaki Y, Sato H. Attenuated Total Reflection Far-Ultraviolet (ATR-FUV) Spectroscopy is a Sensitive Tool for Investigation of Protein Adsorption. APPLIED SPECTROSCOPY 2022; 76:793-800. [PMID: 35081773 DOI: 10.1177/00037028211070835] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Attenuated total reflection far-ultraviolet (ATR-FUV) spectra in the 145-250 nm region were studied for four kinds of proteins (two α-helix-rich proteins: bovine serum albumin (BSA) and lysozyme and two β-sheet rich proteins: concanavalin A and γ-globulin) in different solutions (pure water and phosphate buffered saline, or PBS) with different concentrations. All the spectra show a band at 191 nm due to the π-π* transition of amide bonds of the proteins. The wavelength of the band does not change with their second structures, suggesting that the corresponding electronic transition mode is localized and polarized in the direction that is not affected by the difference in the peptide folding. The intensity of the 191 nm band differs with the concentration of salt in the solution, suggesting that the band intensity reflects the adsorption density of a protein on the internal reflection element (IRE) made of a sapphire glass prism. According to the intensity changes of the band at 191 nm, it is revealed that the properties in adsorption are different from one protein to another. It is assumed that there are two types of forces on the protein adsorption: one is that among the molecules and the other is that between a molecule and a substrate. The origin of force includes localized electrostatic polarity and affinity to water. The ions in the solvent give a marked effect on these forces, resulting in the difference in the response to adsorption density against the salt concentration in the solvent.
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Affiliation(s)
- Kosuke Hashimoto
- School of Biological and Environmental Sciences, 98311Kwansei Gakuin University, Hyogo, Japan
| | - Yusuke Morisawa
- School of Science and Engineering, Kindai University, Osaka, Japan
| | - Mariagrazia Tortora
- Area Science Park, Trieste, Italy
- Elettra-Sincrotrone Trieste, Trieste, Italy
| | | | - Yukihiro Ozaki
- School of Biological and Environmental Sciences, 98311Kwansei Gakuin University, Hyogo, Japan
- Toyota Physical and Chemical Research Institute, Aichi, Japan
| | - Hidetoshi Sato
- School of Biological and Environmental Sciences, 98311Kwansei Gakuin University, Hyogo, Japan
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3
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Ahoulou S, Perret E, Nedelec JM. Functionalization and Characterization of Silicon Nanowires for Sensing Applications: A Review. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:999. [PMID: 33924658 PMCID: PMC8070586 DOI: 10.3390/nano11040999] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 04/07/2021] [Accepted: 04/09/2021] [Indexed: 01/01/2023]
Abstract
Silicon nanowires are attractive materials from the point of view of their electrical properties or high surface-to-volume ratio, which makes them interesting for sensing applications. However, they can achieve a better performance by adjusting their surface properties with organic/inorganic compounds. This review gives an overview of the main techniques used to modify silicon nanowire surfaces as well as characterization techniques. A comparison was performed with the functionalization method developed, and some applications of modified silicon nanowires and their advantages on those non-modified are subsequently presented. In the final words, the future opportunities of functionalized silicon nanowires for chipless tag radio frequency identification (RFID) have been depicted.
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Affiliation(s)
- Samuel Ahoulou
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, ICCF, F-63000 Clermont-Ferrand, France
- LCIS, INP, University of Grenoble Alpes, Grenoble, F-26000 Valence, France;
| | - Etienne Perret
- LCIS, INP, University of Grenoble Alpes, Grenoble, F-26000 Valence, France;
| | - Jean-Marie Nedelec
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, ICCF, F-63000 Clermont-Ferrand, France
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4
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Salatto D, Koga YT, Bajaj Y, Huang Z, Yavitt BM, Meng Y, Carrillo JMY, Sumpter BG, Nykypanchuk D, Taniguchi T, Endoh MK, Koga T. Generalized Protein-Repellent Properties of Ultrathin Homopolymer Films. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Daniel Salatto
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Yuto T. Koga
- Department of Food Science, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York 14853, United States
| | - Yashasvi Bajaj
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Zhixing Huang
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Benjamin M. Yavitt
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Yizhi Meng
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Jan-Michael Y. Carrillo
- Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bobby G. Sumpter
- Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Dmytro Nykypanchuk
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973-5000, United States
| | - Takashi Taniguchi
- Graduate School of Engineering, Department of Chemical Engineering, Kyoto University, Katsura-Campus, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Maya K. Endoh
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Tadanori Koga
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
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5
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Ko WK, Kim SJ, Heo DN, Han IB, Kim S, Kwon IK, Sohn S. Double layers of gold nanoparticles immobilized titanium implants improve the osseointegration in rabbit models. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2019; 24:102129. [PMID: 31760162 DOI: 10.1016/j.nano.2019.102129] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 11/13/2019] [Accepted: 11/13/2019] [Indexed: 10/25/2022]
Abstract
Osseointegration is important in osteopenia and osteoporosis patients due to their low bone densities. Gold nanoparticles (GNPs) are greatly beneficial materials as osteogenic agents. The aim of this study is to investigate osseointegration between bones and double layers of GNP-immobilized titanium (Ti) implants. The physicochemical properties of the Ti surface were evaluated by scanning electron microscopy, by atomic force microscopy, by means of the contact angle using water drops, and by x-ray photoelectron spectroscopy. Osteogenic differentiation of human bone-marrow-derived mesenchymal stem cells was analyzed and showed the higher values in double layers of GNP (GNP2) groups. In addition, we performed an in vivo study using hydroxyapatite (HA) and GNP2 spine pedicle screws in ovariectomized (OVX) and SHAM rabbits. Osseointegration parameters also showed higher values in GNP2 than in HA groups. These findings suggest that implants with double layers of GNPs can be a useful alternative in osteoporotic patients.
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Affiliation(s)
- Wan-Kyu Ko
- Department of Neurosurgery, CHA Bundang Medical Center, CHA University, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea; Department of Biomedical Science, CHA University, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea
| | - Seong Jun Kim
- Department of Neurosurgery, CHA Bundang Medical Center, CHA University, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea; Department of Biomedical Science, CHA University, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea
| | - Dong Nyoung Heo
- Department of Dental Materials, School of Dentistry, Kyung Hee University, Dongdaemun-gu, Seoul, Republic of Korea
| | - In-Bo Han
- Department of Neurosurgery, CHA Bundang Medical Center, CHA University, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea
| | - Sewha Kim
- Department of Pathology, CHA Bundang Medical Center, CHA University, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea
| | - Il Keun Kwon
- Department of Dental Materials, School of Dentistry, Kyung Hee University, Dongdaemun-gu, Seoul, Republic of Korea
| | - Seil Sohn
- Department of Neurosurgery, CHA Bundang Medical Center, CHA University, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea.
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6
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You Y, Tang C, Zhang G, Jiang Z, Lv Z. Thermo‐modulated Hela cell release from an elastic and biocompatible hydrogel. J Biomed Mater Res B Appl Biomater 2018; 107:1786-1791. [DOI: 10.1002/jbm.b.34271] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 09/04/2018] [Accepted: 10/07/2018] [Indexed: 12/17/2022]
Affiliation(s)
- Yujing You
- School of Materials Science, Ningbo University of Technology 201 Fenghua Road, Ningbo, Zhejiang 315211 China
| | - Chenhao Tang
- Chang'an University Middle‐section of Nan'er Huan Road Xi'an, ShaanXi Province 710064 China
| | - Gang Zhang
- Chang'an University Middle‐section of Nan'er Huan Road Xi'an, ShaanXi Province 710064 China
| | - Zhiqiang Jiang
- School of Materials Science, Ningbo University of Technology 201 Fenghua Road, Ningbo, Zhejiang 315211 China
| | - Zhongda Lv
- School of Materials Science, Ningbo University of Technology 201 Fenghua Road, Ningbo, Zhejiang 315211 China
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7
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Film bulk acoustic resonators (FBARs) as biosensors: A review. Biosens Bioelectron 2018; 116:1-15. [DOI: 10.1016/j.bios.2018.05.028] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 05/08/2018] [Accepted: 05/16/2018] [Indexed: 01/01/2023]
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8
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Markov A, Maybeck V, Wolf N, Mayer D, Offenhäusser A, Wördenweber R. Engineering of Neuron Growth and Enhancing Cell-Chip Communication via Mixed SAMs. ACS APPLIED MATERIALS & INTERFACES 2018; 10:18507-18514. [PMID: 29763286 DOI: 10.1021/acsami.8b02948] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The interface between cells and inorganic surfaces represents one of the key elements for bioelectronics experiments and applications ranging from cell cultures and bioelectronics devices to medical implants. In the present paper, we describe a way to tailor the biocompatibility of substrates in terms of cell growth and to significantly improve cell-chip communication, and we also demonstrate the reusability of the substrates for cell experiments. All these improvements are achieved by coating the substrates or chips with a self-assembled monolayer (SAM) consisting of a mixture of organic molecules, (3-aminopropyl)-triethoxysilane and (3-glycidyloxypropyl)-trimethoxysilane. By varying the ratio of these molecules, we are able to tune the cell density and live/dead ratios of rat cortical neurons cultured directly on the mixed SAM as well as neurons cultured on protein-coated SAMs. Furthermore, the use of the SAM leads to a significant improvement in cell-chip communications. Action potential signals of up to 9.4 ± 0.6 mV (signal-to-noise ratio up to 47) are obtained for HL-1 cells on microelectrode arrays. Finally, we demonstrate that the SAMs facilitate a reusability of the samples for all cell experiments with little re-processing.
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Affiliation(s)
- Aleksandr Markov
- Institute of Complex Systems (ICS-8) , Forschungszentrum Jülich , Jülich 52425 , Germany
| | - Vanessa Maybeck
- Institute of Complex Systems (ICS-8) , Forschungszentrum Jülich , Jülich 52425 , Germany
| | - Nikolaus Wolf
- Institute of Complex Systems (ICS-8) , Forschungszentrum Jülich , Jülich 52425 , Germany
| | - Dirk Mayer
- Institute of Complex Systems (ICS-8) , Forschungszentrum Jülich , Jülich 52425 , Germany
| | - Andreas Offenhäusser
- Institute of Complex Systems (ICS-8) , Forschungszentrum Jülich , Jülich 52425 , Germany
| | - Roger Wördenweber
- Institute of Complex Systems (ICS-8) , Forschungszentrum Jülich , Jülich 52425 , Germany
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9
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Schuster B. S-Layer Protein-Based Biosensors. BIOSENSORS 2018; 8:E40. [PMID: 29641511 PMCID: PMC6023001 DOI: 10.3390/bios8020040] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 04/05/2018] [Accepted: 04/09/2018] [Indexed: 01/14/2023]
Abstract
The present paper highlights the application of bacterial surface (S-) layer proteins as versatile components for the fabrication of biosensors. One technologically relevant feature of S-layer proteins is their ability to self-assemble on many surfaces and interfaces to form a crystalline two-dimensional (2D) protein lattice. The S-layer lattice on the surface of a biosensor becomes part of the interface architecture linking the bioreceptor to the transducer interface, which may cause signal amplification. The S-layer lattice as ultrathin, highly porous structure with functional groups in a well-defined special distribution and orientation and an overall anti-fouling characteristics can significantly raise the limit in terms of variety and the ease of bioreceptor immobilization, compactness of bioreceptor molecule arrangement, sensitivity, specificity, and detection limit for many types of biosensors. The present paper discusses and summarizes examples for the successful implementation of S-layer lattices on biosensor surfaces in order to give a comprehensive overview on the application potential of these bioinspired S-layer protein-based biosensors.
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Affiliation(s)
- Bernhard Schuster
- Institute for Synthetic Bioarchitectures, Department of NanoBiotechnology, University of Natural Resources and Life Sciences, Vienna, Muthgasse 11, 1190 Vienna, Austria.
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10
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Markov A, Wolf N, Yuan X, Mayer D, Maybeck V, Offenhäusser A, Wördenweber R. Controlled Engineering of Oxide Surfaces for Bioelectronics Applications Using Organic Mixed Monolayers. ACS APPLIED MATERIALS & INTERFACES 2017; 9:29265-29272. [PMID: 28783310 DOI: 10.1021/acsami.7b08481] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Modifying the surfaces of oxides using self-assembled monolayers offers an exciting possibility to tailor their surface properties for various applications ranging from organic electronics to bioelectronics applications. The simultaneous use of different molecules in particular can extend this approach because the surface properties can be tuned via the ratio of the chosen molecules. This requires the composition and quality of the monolayers to be controlled on an organic level, that is, on the nanoscale. In this paper, we present a method of modifying the surface and surface properties of silicon oxide by growing self-assembled monolayers comprising various compositions of two different molecules, (3-aminopropyl)-triethoxysilane and (3-glycidyloxypropyl)-trimethoxysilane, by means of in situ controlled gas-phase deposition. The properties of the resulting mixed molecular monolayers (e.g., effective thickness, hydrophobicity, and surface potential) exhibit a perfect linear dependence on the composition of the molecular layer. Finally, coating the mixed layer with poly(l-lysine) proves that the density of proteins can be controlled by the composition as well. This indicates that the method might be an ideal way to optimize inorganic surfaces for bioelectronics applications.
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Affiliation(s)
- Aleksandr Markov
- Institute of Complex Systems (ICS-8), Forschungszentrum Jülich , Jülich 52425, Germany
| | - Nikolaus Wolf
- Institute of Complex Systems (ICS-8), Forschungszentrum Jülich , Jülich 52425, Germany
| | - Xiaobo Yuan
- Institute of Complex Systems (ICS-8), Forschungszentrum Jülich , Jülich 52425, Germany
| | - Dirk Mayer
- Institute of Complex Systems (ICS-8), Forschungszentrum Jülich , Jülich 52425, Germany
| | - Vanessa Maybeck
- Institute of Complex Systems (ICS-8), Forschungszentrum Jülich , Jülich 52425, Germany
| | - Andreas Offenhäusser
- Institute of Complex Systems (ICS-8), Forschungszentrum Jülich , Jülich 52425, Germany
| | - Roger Wördenweber
- Institute of Complex Systems (ICS-8), Forschungszentrum Jülich , Jülich 52425, Germany
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11
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Liu X, Cheng C, Wu J, Eda S, Guo Y. A low cost and palm-size analyzer for rapid and sensitive protein detection by AC electrokinetics capacitive sensing. Biosens Bioelectron 2017; 90:83-90. [DOI: 10.1016/j.bios.2016.10.098] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Revised: 10/28/2016] [Accepted: 10/31/2016] [Indexed: 12/11/2022]
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12
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Markov A, Greben K, Mayer D, Offenhäusser A, Wördenweber R. In Situ Analysis of the Growth and Dielectric Properties of Organic Self-Assembled Monolayers: A Way To Tailor Organic Layers for Electronic Applications. ACS APPLIED MATERIALS & INTERFACES 2016; 8:16451-16456. [PMID: 27268402 DOI: 10.1021/acsami.6b04021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Organic nanoscale science and technology relies on the control of phenomena occurring at the molecular level. This is of particular importance for the self-assembly of molecular monolayers (SAM) that can be used in various applications ranging from organic electronics to bioelectronic applications. However, the understanding of the elementary nanoscopic processes in molecular film growth is still in its infancy. Here, we developed a novel in situ and extremely sensitive detection method for the analysis of the electronic properties of molecular layer during molecular layer deposition. This low-frequency sensor (1 kHz) is employed to analyze the standard vapor deposition process of SAMs of molecules and, subsequently, it is used to optimize the growth process itself. By combining this method with an ex situ determination of the effective thickness of the resulting layers via ellipsometry, we observe a large difference of the permittivity (1 kHz) of the examined aminosilanes in the liquid state (εliquid = 5.5-8.8) and in SAMs (εSAM = 22-52, electric field in the plane of the layer). We ascribe this difference to either the different orientation and order of the molecules, the different density of molecules, or a combination of both effects. Our novel in situ analyses not only allows monitoring and optimizing the deposition of organic layers but also demonstrates the high potential of organic SAMs as organic high-k layers in electronic devices.
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Affiliation(s)
- Aleksandr Markov
- Peter Grünberg Institute (PGI-8), Forschungszentrum Jülich , Jülich 52425, Germany
| | - Kyrylo Greben
- Peter Grünberg Institute (PGI-8), Forschungszentrum Jülich , Jülich 52425, Germany
| | - Dirk Mayer
- Peter Grünberg Institute (PGI-8), Forschungszentrum Jülich , Jülich 52425, Germany
| | - Andreas Offenhäusser
- Peter Grünberg Institute (PGI-8), Forschungszentrum Jülich , Jülich 52425, Germany
| | - Roger Wördenweber
- Peter Grünberg Institute (PGI-8), Forschungszentrum Jülich , Jülich 52425, Germany
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13
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Heo DN, Ko WK, Lee HR, Lee SJ, Lee D, Um SH, Lee JH, Woo YH, Zhang LG, Lee DW, Kwon IK. Titanium dental implants surface-immobilized with gold nanoparticles as osteoinductive agents for rapid osseointegration. J Colloid Interface Sci 2016; 469:129-137. [DOI: 10.1016/j.jcis.2016.02.022] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 02/05/2016] [Accepted: 02/05/2016] [Indexed: 10/22/2022]
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14
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Xiao X, Nie G, Zhang X, Tian D, Li H. Protein Adsorption Switch Constructed by a Pillar[5]arene-Based Host-Guest Interaction. Chemistry 2015; 22:941-5. [DOI: 10.1002/chem.201504076] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2015] [Indexed: 01/10/2023]
Affiliation(s)
- Xuan Xiao
- Key Laboratory of Pesticide and Chemical Biology (CCNU); Ministry of Education; College of Chemistry; Central China Normal University; Wuhan 430079 P.R. China
| | - Guanrong Nie
- Key Laboratory of Pesticide and Chemical Biology (CCNU); Ministry of Education; College of Chemistry; Central China Normal University; Wuhan 430079 P.R. China
| | - Xiaoyan Zhang
- Key Laboratory of Pesticide and Chemical Biology (CCNU); Ministry of Education; College of Chemistry; Central China Normal University; Wuhan 430079 P.R. China
| | - Demei Tian
- Key Laboratory of Pesticide and Chemical Biology (CCNU); Ministry of Education; College of Chemistry; Central China Normal University; Wuhan 430079 P.R. China
| | - Haibing Li
- Key Laboratory of Pesticide and Chemical Biology (CCNU); Ministry of Education; College of Chemistry; Central China Normal University; Wuhan 430079 P.R. China
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15
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The development of an electrochemical immunosensor using a thiol aromatic aldehyde and PAMAM-functionalized Fe3O4@Au nanoparticles. Anal Biochem 2015; 485:66-71. [DOI: 10.1016/j.ab.2015.06.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Revised: 06/07/2015] [Accepted: 06/10/2015] [Indexed: 01/12/2023]
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16
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Kroning A, Furchner A, Aulich D, Bittrich E, Rauch S, Uhlmann P, Eichhorn KJ, Seeber M, Luzinov I, Kilbey SM, Lokitz BS, Minko S, Hinrichs K. In Situ Infrared Ellipsometry for Protein Adsorption Studies on Ultrathin Smart Polymer Brushes in Aqueous Environment. ACS APPLIED MATERIALS & INTERFACES 2015; 7:12430-12439. [PMID: 25668395 DOI: 10.1021/am5075997] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The protein-adsorbing and -repelling properties of various smart nanometer-thin polymer brushes containing poly(N-isopropylacrylamide) and poly(acrylic acid) with high potential for biosensing and biomedical applications are studied by in situ infrared-spectroscopic ellipsometry (IRSE). IRSE is a highly sensitive nondestructive technique that allows protein adsorption on polymer brushes to be investigated in an aqueous environment as external stimuli, such as temperature and pH, are varied. These changes are relevant to conditions for regulation of protein adsorption and desorption for biotechnology, biocatalysis, and bioanalytical applications. Here brushes are used as model surfaces for controlling protein adsorption of human serum albumin and human fibrinogen. The important finding of this work is that IRSE in the in situ experiments in protein solutions can distinguish between contributions of polymer brushes and proteins. The vibrational bands of the polymers provide insights into the hydration state of the brushes, whereas the protein-specific amide bands are related to changes of the protein secondary structure.
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Affiliation(s)
- Annika Kroning
- ‡Leibniz-Institut für Analytische Wissenschaften - ISAS - e. V., Schwarzschildstraße 8, 12489 Berlin, Germany
| | - Andreas Furchner
- ‡Leibniz-Institut für Analytische Wissenschaften - ISAS - e. V., Schwarzschildstraße 8, 12489 Berlin, Germany
| | - Dennis Aulich
- ‡Leibniz-Institut für Analytische Wissenschaften - ISAS - e. V., Schwarzschildstraße 8, 12489 Berlin, Germany
| | - Eva Bittrich
- §Leibniz-Institut für Polymerforschung Dresden e. V., Hohe Straße 6, 01069 Dresden, Germany
| | - Sebastian Rauch
- §Leibniz-Institut für Polymerforschung Dresden e. V., Hohe Straße 6, 01069 Dresden, Germany
| | - Petra Uhlmann
- §Leibniz-Institut für Polymerforschung Dresden e. V., Hohe Straße 6, 01069 Dresden, Germany
| | - Klaus-Jochen Eichhorn
- §Leibniz-Institut für Polymerforschung Dresden e. V., Hohe Straße 6, 01069 Dresden, Germany
| | - Michael Seeber
- ⊥School of Materials Science and Engineering Clemson University, 161 Sirrine Hall, Clemson, South Carolina 29634-0971, United States
| | - Igor Luzinov
- ⊥School of Materials Science and Engineering Clemson University, 161 Sirrine Hall, Clemson, South Carolina 29634-0971, United States
| | - S Michael Kilbey
- ∥Departments of Chemistry and of Chemical Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Bradley S Lokitz
- #Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Sergiy Minko
- ∇Department of Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Karsten Hinrichs
- ‡Leibniz-Institut für Analytische Wissenschaften - ISAS - e. V., Schwarzschildstraße 8, 12489 Berlin, Germany
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17
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Abagnale G, Steger M, Nguyen VH, Hersch N, Sechi A, Joussen S, Denecke B, Merkel R, Hoffmann B, Dreser A, Schnakenberg U, Gillner A, Wagner W. Surface topography enhances differentiation of mesenchymal stem cells towards osteogenic and adipogenic lineages. Biomaterials 2015; 61:316-26. [PMID: 26026844 DOI: 10.1016/j.biomaterials.2015.05.030] [Citation(s) in RCA: 250] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Accepted: 05/16/2015] [Indexed: 12/15/2022]
Abstract
Surface topography impacts on cell growth and differentiation, but it is not trivial to generate defined surface structures and to assess the relevance of specific topographic parameters. In this study, we have systematically compared in vitro differentiation of mesenchymal stem cells (MSCs) on a variety of groove/ridge structures. Micro- and nano-patterns were generated in polyimide using reactive ion etching or multi beam laser interference, respectively. These structures affected cell spreading and orientation of human MSCs, which was also reflected in focal adhesions morphology and size. Time-lapse demonstrated directed migration parallel to the nano-patterns. Overall, surface patterns clearly enhanced differentiation of MSCs towards specific lineages: 15 μm ridges increased adipogenic differentiation whereas 2 μm ridges enhanced osteogenic differentiation. Notably, nano-patterns with a periodicity of 650 nm increased differentiation towards both osteogenic and adipogenic lineages. However, in absence of differentiation media surface structures did neither induce differentiation, nor lineage-specific gene expression changes. Furthermore, nanostructures did not affect the YAP/TAZ complex, which is activated by substrate stiffness. Our results provide further insight into how structuring of tailored biomaterials and implant interfaces - e.g. by multi beam laser interference in sub-micrometer scale - do not induce differentiation of MSCs per se, but support their directed differentiation.
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Affiliation(s)
- Giulio Abagnale
- Helmholtz Institute for Biomedical Engineering, Stem Cell Biology and Cellular Engineering, RWTH Aachen University Medical School, Aachen, Germany
| | - Michael Steger
- Fraunhofer Institute for Laser Technology, Aachen, Germany
| | - Vu Hoa Nguyen
- Institute of Materials in Electrical Engineering 1 (IWE1), RWTH Aachen University, Aachen, Germany
| | - Nils Hersch
- Institute of Complex Systems, ICS-7: Biomechanics, Forschungszentrum Jülich GmbH, Jülich, Germany
| | - Antonio Sechi
- Institute of Biomedical Engineering, Cell Biology, RWTH Aachen University Medical School, Aachen, Germany
| | - Sylvia Joussen
- Helmholtz Institute for Biomedical Engineering, Stem Cell Biology and Cellular Engineering, RWTH Aachen University Medical School, Aachen, Germany
| | - Bernd Denecke
- Interdisciplinary Center for Clinical Research, RWTH Aachen University Medical School, Aachen, Germany
| | - Rudolf Merkel
- Institute of Complex Systems, ICS-7: Biomechanics, Forschungszentrum Jülich GmbH, Jülich, Germany
| | - Bernd Hoffmann
- Institute of Complex Systems, ICS-7: Biomechanics, Forschungszentrum Jülich GmbH, Jülich, Germany
| | - Alice Dreser
- Institute of Neuropathology, RWTH Aachen University Medical School, Aachen, Germany
| | - Uwe Schnakenberg
- Institute of Materials in Electrical Engineering 1 (IWE1), RWTH Aachen University, Aachen, Germany
| | - Arnold Gillner
- Fraunhofer Institute for Laser Technology, Aachen, Germany
| | - Wolfgang Wagner
- Helmholtz Institute for Biomedical Engineering, Stem Cell Biology and Cellular Engineering, RWTH Aachen University Medical School, Aachen, Germany.
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18
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Ingavle GC, Baillie LWJ, Zheng Y, Lis EK, Savina IN, Howell CA, Mikhalovsky SV, Sandeman SR. Affinity binding of antibodies to supermacroporous cryogel adsorbents with immobilized protein A for removal of anthrax toxin protective antigen. Biomaterials 2015; 50:140-53. [PMID: 25736504 DOI: 10.1016/j.biomaterials.2015.01.039] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 12/21/2014] [Accepted: 01/20/2015] [Indexed: 01/17/2023]
Abstract
Polymeric cryogels are efficient carriers for the immobilization of biomolecules because of their unique macroporous structure, permeability, mechanical stability and different surface chemical functionalities. The aim of the study was to demonstrate the potential use of macroporous monolithic cryogels for biotoxin removal using anthrax toxin protective antigen (PA), the central cell-binding component of the anthrax exotoxins, and covalent immobilization of monoclonal antibodies. The affinity ligand (protein A) was chemically coupled to the reactive hydroxyl and epoxy-derivatized monolithic cryogels and the binding efficiencies of protein A, monoclonal antibodies to the cryogel column were determined. Our results show differences in the binding capacity of protein A as well as monoclonal antibodies to the cryogel adsorbents caused by ligand concentrations, physical properties and morphology of surface matrices. The cytotoxicity potential of the cryogels was determined by an in vitro viability assay using V79 lung fibroblast as a model cell and the results reveal that the cryogels are non-cytotoxic. Finally, the adsorptive capacities of PA from phosphate buffered saline (PBS) were evaluated towards a non-glycosylated, plant-derived human monoclonal antibody (PANG) and a glycosylated human monoclonal antibody (Valortim(®)), both of which were covalently attached via protein A immobilization. Optimal binding capacities of 108 and 117 mg/g of antibody to the adsorbent were observed for PANG attached poly(acrylamide-allyl glycidyl ether) [poly(AAm-AGE)] and Valortim(®) attached poly(AAm-AGE) cryogels, respectively, This indicated that glycosylation status of Valortim(®) antibody could significantly increase (8%) its binding capacity relative to the PANG antibody on poly(AAm-AGE)-protien-A column (p < 0.05). The amounts of PA which remained in the solution after passing PA spiked PBS through PANG or Valortim bound poly(AAm-AGE) cryogel were significantly (p < 0.05) decreased relative to the amount of PA remained in the solution after passing through unmodified as well as protein A modified poly(AAm-AGE) cryogel columns, indicates efficient PA removal from spiked PBS over 60 min of circulation. The high adsorption capacity towards anthrax toxin PA of the cryogel adsorbents indicated potential application of these materials for treatment of Bacillus anthracis infection.
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Affiliation(s)
- Ganesh C Ingavle
- Biomaterials and Medical Devices Research Group, School of Pharmacy and Biomolecular Sciences, Huxley Building, University of Brighton, Brighton, East Sussex BN2 4GJ, UK.
| | - Les W J Baillie
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, Redwood Building, King Edward VII Avenue, Cardiff CF10 3NB, UK.
| | - Yishan Zheng
- Biomaterials and Medical Devices Research Group, School of Pharmacy and Biomolecular Sciences, Huxley Building, University of Brighton, Brighton, East Sussex BN2 4GJ, UK.
| | - Elzbieta K Lis
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, Redwood Building, King Edward VII Avenue, Cardiff CF10 3NB, UK.
| | - Irina N Savina
- Biomaterials and Medical Devices Research Group, School of Pharmacy and Biomolecular Sciences, Huxley Building, University of Brighton, Brighton, East Sussex BN2 4GJ, UK.
| | - Carol A Howell
- Biomaterials and Medical Devices Research Group, School of Pharmacy and Biomolecular Sciences, Huxley Building, University of Brighton, Brighton, East Sussex BN2 4GJ, UK.
| | - Sergey V Mikhalovsky
- Biomaterials and Medical Devices Research Group, School of Pharmacy and Biomolecular Sciences, Huxley Building, University of Brighton, Brighton, East Sussex BN2 4GJ, UK; School of Engineering, Nazarbayev University, 53 Kabanbay Batyr Ave., Astana 010000, Kazakhstan.
| | - Susan R Sandeman
- Biomaterials and Medical Devices Research Group, School of Pharmacy and Biomolecular Sciences, Huxley Building, University of Brighton, Brighton, East Sussex BN2 4GJ, UK.
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19
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Applications of hydrophobins: current state and perspectives. Appl Microbiol Biotechnol 2015; 99:1587-97. [PMID: 25564034 DOI: 10.1007/s00253-014-6319-x] [Citation(s) in RCA: 103] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Revised: 12/08/2014] [Accepted: 12/09/2014] [Indexed: 01/07/2023]
Abstract
Hydrophobins are proteins exclusively produced by filamentous fungi. They self-assemble at hydrophilic-hydrophobic interfaces into an amphipathic film. This protein film renders hydrophobic surfaces of gas bubbles, liquids, or solid materials wettable, while hydrophilic surfaces can be turned hydrophobic. These properties, among others, make hydrophobins of interest for medical and technical applications. For instance, hydrophobins can be used to disperse hydrophobic materials; to stabilize foam in food products; and to immobilize enzymes, peptides, antibodies, cells, and anorganic molecules on surfaces. At the same time, they may be used to prevent binding of molecules. Furthermore, hydrophobins have therapeutic value as immunomodulators and can been used to produce recombinant proteins.
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20
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Wilson KA, Finch CA, Anderson P, Vollmer F, Hickman JJ. Combining an optical resonance biosensor with enzyme activity kinetics to understand protein adsorption and denaturation. Biomaterials 2014; 38:86-96. [PMID: 25453976 DOI: 10.1016/j.biomaterials.2014.10.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Accepted: 10/02/2014] [Indexed: 11/30/2022]
Abstract
Understanding protein adsorption and resultant conformation changes on modified and unmodified silicon dioxide surfaces is a subject of keen interest in biosensors, microfluidic systems and for medical diagnostics. However, it has been proven difficult to investigate the kinetics of the adsorption process on these surfaces as well as understand the topic of the denaturation of proteins and its effect on enzyme activity. A highly sensitive optical whispering gallery mode (WGM) resonator was used to study a catalytic enzyme's adsorption processes on different silane modified glass substrates (plain glass control, DETA, 13 F, and SiPEG). The WGM sensor was able to obtain high resolution kinetic data of glucose oxidase (GO) adsorption with sensitivity of adsorption better than that possible with SPR. The kinetic data, in combination with a functional assay of the enzyme activity, was used to test hypotheses on adsorption mechanisms. By fitting numerical models to the WGM sensograms for protein adsorption, and by confirming numerical predictions of enzyme activity in a separate assay, we were able to identify mechanisms for GO adsorption on different alkylsilanes and infer information about the adsorption of protein on nanostructured surfaces.
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Affiliation(s)
- Kerry A Wilson
- Nanoscience Technology Center, University of Central Florida, 12424 Research Parkway, Orlando, FL 32826, USA
| | - Craig A Finch
- Nanoscience Technology Center, University of Central Florida, 12424 Research Parkway, Orlando, FL 32826, USA
| | - Phillip Anderson
- Nanoscience Technology Center, University of Central Florida, 12424 Research Parkway, Orlando, FL 32826, USA
| | - Frank Vollmer
- The Wyss & Rowland Institutes, Harvard University, 100 Edwin H. Land Blvd, Cambridge, MA 02142, USA
| | - James J Hickman
- Nanoscience Technology Center, University of Central Florida, 12424 Research Parkway, Orlando, FL 32826, USA.
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21
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Lewitus DY, Smith KL, Landers J, Neimark AV, Kohn J. Bioactive Agarose Carbon-Nanotube Composites are Capable of Manipulating Brain-Implant Interface. J Appl Polym Sci 2014; 131:10.1002/app.40297. [PMID: 25382868 PMCID: PMC4221857 DOI: 10.1002/app.40297] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Composite electrodes made of the polysaccharide agarose and carbon nanotube fibers (A-CNE) have shown potential to be applied as tissue-compatible, micro-electronic devices. In the present work, A-CNEs were functionalized using neuro-relevant proteins (laminin and alpha-melanocyte stimulating hormone) and implanted in brain tissue for 1 week (acute response) and 4 weeks (chronic response). Qualitative and quantitative analysis of neuronal and immunological responses revealed significant changes in immunological response to implanted materials depending on the type of biomolecule used. The potential to manipulate tissue response through the use of an anti-inflammatory protein, alpha-melanocyte stimulating hormone, was shown in the reduction of astroglia presence near the implant site during the glial scar formation. These results suggest that A-CNEs, which are soft, flexible, and easily made bioactive, have the ability to modify brain tissue response through surface modification as a function of the biomolecule used.
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Affiliation(s)
- Dan Y. Lewitus
- New Jersey Center for Biomaterials, Rutgers, The State University of New Jersey, 145 Bevier Rd., Piscataway, NJ 08854, USA
| | - Karen L. Smith
- Wadsworth Center, New York State Department of Health, Empire State Plaza, Albany, NY 12201, USA
| | - John Landers
- Department of Chemical and Biochemical Engineering Rutgers, State University of New Jersey, Piscataway, NJ, 08854, USA
| | - Alexander V. Neimark
- Department of Chemical and Biochemical Engineering Rutgers, State University of New Jersey, Piscataway, NJ, 08854, USA
| | - Joachim Kohn
- New Jersey Center for Biomaterials, Rutgers, The State University of New Jersey, 145 Bevier Rd., Piscataway, NJ 08854, USA
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22
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Woods DA, Bain CD. Total internal reflection spectroscopy for studying soft matter. SOFT MATTER 2014; 10:1071-1096. [PMID: 24651911 DOI: 10.1039/c3sm52817k] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Total internal reflection (TIR) spectroscopy is a widely used technique to study soft matter at interfaces. This tutorial review aims to provide researchers with an overview of the principles, experimental design and applications of TIR spectroscopy to enable them to understand how this class of techniques might be used in their research. It also highlights limitations and pitfalls of TIR techniques, which will assist readers in critically analysing the literature. Techniques covered include attenuated total reflection infrared spectroscopy (ATR-IR), TIR fluorescence, TIR Raman scattering and cavity-enhanced techniques. Other related techniques are briefly described.
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Affiliation(s)
- David A Woods
- Department of Chemistry, Durham University, South Road, Durham, UKDH1 3LE.
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23
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Hu Y, Jin J, Han Y, Yin J, Jiang W, Liang H. Study of fibrinogen adsorption on poly(ethylene glycol)-modified surfaces using a quartz crystal microbalance with dissipation and a dual polarization interferometry. RSC Adv 2014. [DOI: 10.1039/c3ra46934d] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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24
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Yadav AR, Sriram R, Carter JA, Miller BL. Comparative study of solution-phase and vapor-phase deposition of aminosilanes on silicon dioxide surfaces. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 35:283-90. [PMID: 24411379 DOI: 10.1016/j.msec.2013.11.017] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 10/03/2013] [Accepted: 11/08/2013] [Indexed: 02/06/2023]
Abstract
The uniformity of aminosilane layers typically used for the modification of hydroxyl bearing surfaces such as silicon dioxide is critical for a wide variety of applications, including biosensors. However, in spite of many studies that have been undertaken on surface silanization, there remains a paucity of easy-to-implement deposition methods reproducibly yielding smooth aminosilane monolayers. In this study, solution- and vapor-phase deposition methods for three aminoalkoxysilanes differing in the number of reactive groups (3-aminopropyl triethoxysilane (APTES), 3-aminopropyl methyl diethoxysilane (APMDES) and 3-aminopropyl dimethyl ethoxysilane (APDMES)) were assessed with the aim of identifying methods that yield highly uniform and reproducible silane layers that are resistant to minor procedural variations. Silane film quality was characterized based on measured thickness, hydrophilicity and surface roughness. Additionally, hydrolytic stability of the films was assessed via these thickness and contact angle values following desorption in water. We found that two simple solution-phase methods, an aqueous deposition of APTES and a toluene based deposition of APDMES, yielded high quality silane layers that exhibit comparable characteristics to those deposited via vapor-phase methods.
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Affiliation(s)
- Amrita R Yadav
- Department of Physics and Astronomy, University of Rochester, Rochester, NY, USA
| | - Rashmi Sriram
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, USA
| | | | - Benjamin L Miller
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, USA; Department of Dermatology, University of Rochester, Rochester, NY, USA; Department of Biophysics and Biochemistry, University of Rochester, Rochester, NY, USA.
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25
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Ehrl BN, Liebherr RB, Gorris HH. Single molecule kinetics of horseradish peroxidase exposed in large arrays of femtoliter-sized fused silica chambers. Analyst 2013; 138:4260-5. [PMID: 23752650 DOI: 10.1039/c3an00809f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Large arrays of femtoliter-sized chambers were etched into the surface of fused silica slides to enclose and observe hundreds of single horseradish peroxidase (HRP) molecules in parallel. Individual molecules of HRP oxidize the fluorogenic substrate Amplex Red to fluorescent resorufin in separate chambers, which was monitored by fluorescence microscopy. Photooxidation of Amplex Red and photobleaching of resorufin have previously limited the analysis of HRP in femtoliter arrays. We have strongly reduced these effects by optimizing the fluorescence excitation and detection scheme to yield accurate single molecule substrate turnover rates. We demonstrate the presence of long-lived kinetic states of single HRP molecules that are individually different for each molecule in the array. The large number of molecules investigated in parallel provides excellent statistics on the activity distribution in the enzyme population, which is similar to that reported for other enzymes such as β-galactosidase. We have further confirmed that the product formation of HRP in femtoliter chambers is 10-fold lower than that in the bulk solution due to the particular two-step redox reaction mechanism of HRP.
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Affiliation(s)
- Benno N Ehrl
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, D-93040 Regensburg, Germany
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26
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Ozhikandathil J, Packirisamy M. Detection of recombinant growth hormone by evanescent cascaded waveguide coupler on silica-on-silicon. JOURNAL OF BIOPHOTONICS 2013; 6:457-67. [PMID: 22829397 DOI: 10.1002/jbio.201200094] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Revised: 06/21/2012] [Accepted: 07/08/2012] [Indexed: 05/26/2023]
Abstract
An evanescent wave based biosensor is developed on the silica-on-silicon (SOS) with a cascaded waveguide coupler for the detection of recombinant growth hormone. So far, U -bends and tapered waveguides are demonstrated for increasing the penetration depth and enhancing sensitivity of the evanescent wave sensor. In this work, a monolithically integrated sensor platform containing a cascaded waveguide coupler with optical power splitters and combiners designed with S -bends and tapper waveguides is demonstrated for an enhanced detection of recombinant growth hormone. In the cascaded waveguide coupler, a large surface area to bind the antibody with increased penetration depth of evanescent wave to excite the tagged-rbST is obtained by splitting the waveguide into multiple paths using Y splitters designed with s -bends and subsequently combining them back to a single waveguide through tapered waveguide and combiners. Hence a highly sensitive fluoroimmunoassay sensor is realized. Using the 2D FDTD (Finite-difference time-domain method) simulation of waveguide with a point source in Rsoft FullWAVE, the fluorescence coupling efficiency of straight and bend section of waveguide is analyzed. The sensor is demonstrated for the detection of fluorescently-tagged recombinant growth hormone with the detection limit as low as 25 ng/ml.
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Affiliation(s)
- Jayan Ozhikandathil
- Optical Bio-Microsystems Laboratory, Department of Mechanical and Industrial Engineering, Concordia University, Montreal, Canada
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27
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Richter AG, Kuzmenko I. Using in situ X-ray reflectivity to study protein adsorption on hydrophilic and hydrophobic surfaces: benefits and limitations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:5167-5180. [PMID: 23586436 DOI: 10.1021/la3049532] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We have employed in situ X-ray reflectivity (IXRR) to study the adsorption of a variety of proteins (lysozyme, cytochrome c, myoglobin, hemoglobin, serum albumin, and immunoglobulin G) on model hydrophilic (silicon oxide) and hydrophobic surfaces (octadecyltrichlorosilane self-assembled monolayers), evaluating this recently developed technique for its applicability in the area of biomolecular studies. We report herein the highest resolution depiction of adsorbed protein films, greatly improving on the precision of previous neutron reflectivity (NR) results and previous IXRR studies. We were able to perform complete scans in 5 min or less with the maximum momentum transfer of at least 0.52 Å(-1), allowing for some time-resolved information about the evolution of the protein film structure. The three smallest proteins (lysozyme, cytochrome c, and myoglobin) were seen to deposit as fully hydrated, nondenatured molecules onto hydrophilic surfaces, with indications of particular preferential orientations. Time evolution was observed for both lysozyme and myoglobin films. The larger proteins were not observed to deposit on the hydrophilic substrates, perhaps because of contrast limitations. On hydrophobic surfaces, all proteins were seen to denature extensively in a qualitatively similar way but with a rough trend that the larger proteins resulted in lower coverage. We have generated high-resolution electron density profiles of these denatured films, including capturing the growth of a lysozyme film. Because the solution interface of these denatured films is diffuse, IXRR cannot unambiguously determine the film extent and coverage, a drawback compared to NR. X-ray radiation damage was systematically evaluated, including the controlled exposure of protein films to high-intensity X-rays and exposure of the hydrophobic surface to X-rays before adsorption. Our analysis showed that standard measuring procedures used for XRR studies may lead to altered protein films; therefore, we used modified procedures to limit the influence of X-ray damage.
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Affiliation(s)
- Andrew G Richter
- Department of Physics and Astronomy, Valparaiso University, Valparaiso, Indiana 46383, USA.
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28
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Photo-cleavable anti-fouling polymer brushes: A simple and versatile platform for multicomponent protein patterning. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.02.027] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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29
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Mujawar LH, Norde W, van Amerongen A. Spot morphology of non-contact printed protein molecules on non-porous substrates with a range of hydrophobicities. Analyst 2013; 138:518-24. [DOI: 10.1039/c2an36104c] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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30
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Yano YF. Kinetics of protein unfolding at interfaces. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:503101. [PMID: 23164927 DOI: 10.1088/0953-8984/24/50/503101] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The conformation of protein molecules is determined by a balance of various forces, including van der Waals attraction, electrostatic interaction, hydrogen bonding, and conformational entropy. When protein molecules encounter an interface, they are often adsorbed on the interface. The conformation of an adsorbed protein molecule strongly depends on the interaction between the protein and the interface. Recent time-resolved investigations have revealed that protein conformation changes during the adsorption process due to the protein-protein interaction increasing with increasing interface coverage. External conditions also affect the protein conformation. This review considers recent dynamic observations of protein adsorption at various interfaces and their implications for the kinetics of protein unfolding at interfaces.
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Affiliation(s)
- Yohko F Yano
- Department of Physics, Kinki University, Higashiosaka City, Osaka, Japan.
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31
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Bhan C, Mandlewala R, Gebregeorgis A, Raghavan D. Adsorption-desorption study of BSA conjugated silver nanoparticles (Ag/BSA NPs) on collagen immobilized substrates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:17043-17052. [PMID: 23151257 DOI: 10.1021/la303539n] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
There has been a growing interest in the use of protein conjugated nanoparticles for applications in biomedical, sensing, and advanced imaging. The objective of this study was to understand the interaction of protein conjugated silver nanoparticles (Ag/BSA NPs) with biological substrate (collagen layer). The adsorption behavior of synthesized Ag/BSA NPs on collagen immobilized silanized surface was followed by UV-vis spectroscopy by initially studying the formation of collagen layer and subsequent adsorption of Ag/BSA NPs to the immobilized layer. Surface plasmon resonance (SPR) data provided the real time profile of adsorption of Ag/BSA NPs from solution onto collagen immobilized and control substrates as well as desorption of nanoparticles from the substrates. The retention of NPs to substrate is sensitive to chemistry of the underlying substrate and on the external environment. UV-vis and atomic absorption spectrometric analysis of Ag/BSA NPs desorption performed under different pH conditions showed more NPs retained at physiological pH than the acidic and basic conditions. Nanoparticles retention on collagen immobilized substrate at physiological pH could influence properties of biological interest such as circulation lifetime and biodistribution of nanoparticles in the body.
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Affiliation(s)
- Chandra Bhan
- Polymer Group, Department of Chemistry, Howard University, Washington, DC 20059, USA
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32
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Evaluation of polydimethylsiloxane (PDMS) surface modification approaches for microfluidic applications. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.10.008] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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33
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Chen J, Wang J, Qi P, Li X, Ma B, Chen Z, Li Q, Zhao Y, Xiong K, Maitz MF, Huang N. Biocompatibility studies of poly(ethylene glycol)–modified titanium for cardiovascular devices. J BIOACT COMPAT POL 2012. [DOI: 10.1177/0883911512461108] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The rapid protein adsorption on a material surface causes blood coagulation, platelet activation, and complement system activation, which poses a risk for failure of cardiovascular devices. In this study, a chemically hydroxylated titanium surface was aminosilanized and covalently grafted with poly(ethylene glycol). The reaction conditions on the grafted quantity were studied by the respective amine and carboxyl densities. The blood compatibility of the PEGylated surfaces with different poly(ethylene glycol) densities and chain lengths was evaluated; the PEGylated surfaces with higher grafted density and longer chain length had less fibrinogen adsorption, less fibrinogen γ-chain exposed, less adherent platelets, and lower activation of the adherent platelets. In addition to the influence on blood, the longer chain PEGylated surfaces resisted, not only smooth muscle cell attachment and proliferation, but also macrophage attachment and death. This method is a good candidate for improving cardiovascular implant surfaces.
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Affiliation(s)
- Jialong Chen
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, China
- College of Stomatology, Anhui Medical University, Hefei, China
| | - Juan Wang
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, China
| | - Pengkai Qi
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, China
| | - Xin Li
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, China
| | - Baolong Ma
- School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, China
| | - Zhuoyue Chen
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, China
| | - Quanli Li
- College of Stomatology, Anhui Medical University, Hefei, China
| | - Yuancong Zhao
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, China
| | - Kaiqin Xiong
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, China
| | - Manfred F Maitz
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, China
- Max Bergmann Center of Biomaterials Dresden, Leibniz Institute of Polymer Research Dresden, Dresden, Germany
| | - Nan Huang
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, China
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Stoianov SV, Daengngam C, Borhani M, Zhang Y, Morris JR, Robinson HD. Amine-rich polyelectrolyte multilayers for patterned surface fixation of nanostructures. ACS APPLIED MATERIALS & INTERFACES 2012; 4:2348-2357. [PMID: 22475030 DOI: 10.1021/am300117f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We describe a lithographic method for directly patterning the adhesive properties of amine-rich layer-by-layer assembled polymer films, useful for positioning metal and other nanostructures. The adhesive properties of the films are sufficiently robust that the films can be patterned with standard as opposed to soft lithographic methods. We perform the patterning with a lithographically defined evaporated aluminum mask which protects selected regions of the substrate, passivating adhesion in the exposed regions with acetic anhydride. When the aluminum is removed with a HCl etch, the protected regions retain their adhesion, whereas particle adsorption is almost completely eliminated in the passivated areas, making it possible to guide adsorption to the protected areas. The high degree of adhesion comes about because of uncoordinated amine groups that pervade the film. Cycling the pH from high values to low and back causes the amines to be rearranged, rejuvenating the adhesive properties of the surface, which is the likely origin of the robustness of the adhesive properties to processing. pH adjustment also causes reversible swelling and deswelling of the film, so that the vertical position and dielectric environment of the nanostructure can be dynamically adjusted, which can be particularly beneficial for tuning the plasmonic resonances of metallic structures.
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Affiliation(s)
- Stefan V Stoianov
- Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
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Leyden MR, Messinger RJ, Schuman C, Sharf T, Remcho VT, Squires TM, Minot ED. Increasing the detection speed of an all-electronic real-time biosensor. LAB ON A CHIP 2012; 12:954-959. [PMID: 22252647 DOI: 10.1039/c2lc21020g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Biosensor response time, which depends sensitively on the transport of biomolecules to the sensor surface, is a critical concern for future biosensor applications. We have fabricated carbon nanotube field-effect transistor biosensors and quantified protein binding rates onto these nanoelectronic sensors. Using this experimental platform we test the effectiveness of a protein repellent coating designed to enhance protein flux to the all-electronic real-time biosensor. We observe a 2.5-fold increase in the initial protein flux to the sensor when upstream binding sites are blocked. Mass transport modelling is used to calculate the maximal flux enhancement that is possible with this strategy. Our results demonstrate a new methodology for characterizing nanoelectronic biosensor performance, and demonstrate a mass transport optimization strategy that is applicable to a wide range of microfluidic based biosensors.
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Affiliation(s)
- Matthew R Leyden
- Department of Physics, Oregon State University, Corvallis, OR 97331, USA
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36
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Bu Y, Wang S, Chen Q, Jin H, Lin J, Wang J. Self-assembly of osmium complexes on reduced graphene oxide: A case study toward electrochemical chiral sensing. Electrochem commun 2012. [DOI: 10.1016/j.elecom.2011.12.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022] Open
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Zhu XM, Wang YXJ, Leung KCF, Lee SF, Zhao F, Wang DW, Lai JMY, Wan C, Cheng CHK, Ahuja AT. Enhanced cellular uptake of aminosilane-coated superparamagnetic iron oxide nanoparticles in mammalian cell lines. Int J Nanomedicine 2012; 7:953-64. [PMID: 22393292 PMCID: PMC3289449 DOI: 10.2147/ijn.s28316] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Purpose To compare the cellular uptake efficiency and cytotoxicity of aminosilane (SiO2-NH2)-coated superparamagnetic iron oxide (SPIO@SiO2-NH2) nanoparticles with three other types of SPIO nanoparticles coated with SiO2 (SPIO@SiO2), dextran (SPIO@dextran), or bare SPIO in mammalian cell lines. Materials and methods Four types of monodispersed SPIO nanoparticles with a SPIO core size of 7 nm and an overall size in a range of 7–15 nm were synthesized. The mammalian cell lines of MCF-7, MDA-MB-231, HT-29, RAW264.7, L929, HepG2, PC-3, U-87 MG, and mouse mesenchymal stem cells (MSCs) were incubated with four types of SPIO nanoparticles for 24 hours in the serum-free culture medium Dulbecco’s modified Eagle’s medium (DMEM) with 4.5 μg/mL iron concentration. The cellular uptake efficiencies of SPIO nanoparticles were compared by Prussian blue staining and intracellular iron quantification. In vitro magnetic resonance imaging of MSC pellets after SPIO labeling was performed at 3 T. The effect of each SPIO nanoparticle on the cell viability of RAW 264.7 (mouse monocyte/macrophage) cells was also evaluated. Results Transmission electron microscopy demonstrated surface coating with SiO2-NH2, SiO2, and dextran prevented SPIO nanoparticle aggregation in DMEM culture medium. MCF-7, MDA-MB-231, and HT-29 cells failed to show notable iron uptake. For all the remaining six cell lines, Prussian blue staining and intracellular iron quantification demonstrated that SPIO@ SiO2-NH2 nanoparticles had the highest cellular uptake efficiency. SPIO@SiO2-NH2, bare SPIO, and SPIO@dextran nanoparticles did not affect RAW 264.7 cell viability up to 200 μg Fe/mL, while SPIO@SiO2 reduced RAW 264.7 cell viability from 10 to 200 μg Fe/mL in a dose-dependent manner. Conclusion Cellular uptake efficiency of SPIO nanoparticles depends on both the cell type and SPIO surface characteristics. Aminosilane surface coating enhanced the cellular uptake efficiency without inducing cytotoxicity in a number of cell lines.
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Affiliation(s)
- Xiao-Ming Zhu
- Department of Imaging and Interventional Radiology, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR
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Lee WC, Lim CHYX, Shi H, Tang LAL, Wang Y, Lim CT, Loh KP. Origin of enhanced stem cell growth and differentiation on graphene and graphene oxide. ACS NANO 2011; 5:7334-41. [PMID: 21793541 DOI: 10.1021/nn202190c] [Citation(s) in RCA: 663] [Impact Index Per Article: 51.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The culture of bone marrow derived mesenchymal stem cells (MSCs), as well as the control of its differentiation toward different tissue lineage, is a very important part of tissue engineering, where cells are combined with artificial scaffold to regenerate tissues. Graphene (G) and graphene oxide (GO) sheets are soft membranes with high in-plane stiffness and can potentially serve as a biocompatible, transferable, and implantable platform for stem cell culture. While the healthy proliferation of stem cells on various carbon platforms has been demonstrated, the chemical role of G and GO, if any, in guiding uncommitted stem cells toward differentiated cells is not known. Herein, we report that the strong noncovalent binding abilities of G allow it to act as a preconcentration platform for osteogenic inducers, which accelerate MSCs growing on it toward the osteogenic lineage. The molecular origin of accelerated differentation is investigated by studying the binding abilities of G and GO toward different growth agents. Interestingly, differentiation to adipocytes is greatly suppressed on G because insulin, which is a key regulator for the synthesis of fatty acids, is denatured upon π-π adsorption on G; in contrast, GO does not interfere with adipogenesis due to electrostatic binding with insulin. The different binding interactions and their subsequent influence on stem cell growth and differentiation are ascribed to different degrees of π-π stacking and electrostatic and hydrogen bonding mediated by G and GO.
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Affiliation(s)
- Wong Cheng Lee
- NUS Graduate School for Integrative Sciences and Engineering, Centre for Life Sciences #05-01, National University of Singapore, 28 Medical Drive, 117456, Singapore
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Dykstra PH, Roy V, Byrd C, Bentley WE, Ghodssi R. Microfluidic electrochemical sensor array for characterizing protein interactions with various functionalized surfaces. Anal Chem 2011; 83:5920-7. [PMID: 21688780 DOI: 10.1021/ac200835s] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present a unique microfluidic platform to allow for quick and sensitive probing of protein adsorption to various functionalized surfaces. The ability to tailor a sensor surface for a specific analyte is crucial for the successful application of portable gas and fluid sensors and is of great interest to the drug screening community. However, choosing the correct surface chemistry to successfully passivate against nonspecific binding typically requires repeated trial and error experiments. The presented device incorporates an array of integrated electrochemical sensors for fast, sensitive, label-free detection of these binding interactions. The layout of the electrodes allows for loading various surface chemistries in one direction while sensing their interactions with particular compounds in another without any cross-contamination. Impedance data is collected for three commonly used passivation compounds (mercaptohexanol, polyethylene glycol, and bovine serum albumin) and demonstrates their interaction with three commonly studied proteins in genetic and cancer research (cAMP receptor protein, tumor necrosis factor α, and tumor necrosis factor β). The ability to quickly characterize various surface interactions provides knowledge for selecting optimal functionalization for any biosensor.
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Affiliation(s)
- Peter H Dykstra
- MEMS Sensors and Actuators Laboratory (MSAL), Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland, United States.
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40
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Understanding protein adsorption phenomena at solid surfaces. Adv Colloid Interface Sci 2011; 162:87-106. [PMID: 21295764 DOI: 10.1016/j.cis.2010.12.007] [Citation(s) in RCA: 986] [Impact Index Per Article: 75.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2010] [Revised: 12/21/2010] [Accepted: 12/28/2010] [Indexed: 11/21/2022]
Abstract
Protein adsorption at solid surfaces plays a key role in many natural processes and has therefore promoted a widespread interest in many research areas. Despite considerable progress in this field there are still widely differing and even contradictive opinions on how to explain the frequently observed phenomena such as structural rearrangements, cooperative adsorption, overshooting adsorption kinetics, or protein aggregation. In this review recent achievements and new perspectives on protein adsorption processes are comprehensively discussed. The main focus is put on commonly postulated mechanistic aspects and their translation into mathematical concepts and model descriptions. Relevant experimental and computational strategies to practically approach the field of protein adsorption mechanisms and their impact on current successes are outlined.
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41
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Charlton C, Gubala V, Gandhiraman RP, Wiechecki J, Le NCH, Coyle C, Daniels S, MacCraith BD, Williams DE. TIRF microscopy as a screening method for non-specific binding on surfaces. J Colloid Interface Sci 2011; 354:405-9. [DOI: 10.1016/j.jcis.2010.10.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2010] [Revised: 10/12/2010] [Accepted: 10/13/2010] [Indexed: 11/29/2022]
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42
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Gun'ko VM, Mikhalovska LI, Tomlins PE, Mikhalovsky SV. Competitive adsorption of macromolecules and real-time dynamics of Vroman-like effects. Phys Chem Chem Phys 2011; 13:4476-85. [DOI: 10.1039/c0cp02165b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Chumbimuni-Torres KY, Coronado RE, Mfuh AM, Castro-Guerrero C, Silva MF, Negrete GR, Bizios R, Garcia CD. Adsorption of Proteins to Thin-Films of PDMS and Its Effect on the Adhesion of Human Endothelial Cells. RSC Adv 2011; 1:706-714. [PMID: 25068038 DOI: 10.1039/c1ra00198a] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This paper describes a simple and inexpensive procedure to produce thin-films of poly(dimethylsiloxane). Such films were characterized by a variety of techniques (ellipsometry, nuclear magnetic resonance, atomic force microscopy, and goniometry) and used to investigate the adsorption kinetics of three model proteins (fibrinogen, collagen type-I, and bovine serum albumin) under different conditions. The information collected from the protein adsorption studies was then used to investigate the adhesion of human dermal microvascular endothelial cells. The results of these studies suggest that these films can be used to model the surface properties of microdevices fabricated with commercial PDMS. Moreover, the paper provides guidelines to efficiently attach cells in BioMEMS devices.
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Affiliation(s)
| | - Ramon E Coronado
- Department of Biomedical Engineering, The University of Texas at San Antonio
| | - Adelphe M Mfuh
- Department of Chemistry, The University of Texas at San Antonio
| | | | - Maria Fernanda Silva
- School of Agronomic Sciences - IBAM-CONICET, National University of Cuyo, Mendoza, Argentina
| | | | - Rena Bizios
- Department of Biomedical Engineering, The University of Texas at San Antonio
| | - Carlos D Garcia
- Department of Chemistry, The University of Texas at San Antonio
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44
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Chen CS, Chang KN, Chen YH, Lee CK, Lee BYJ, Lee ASY. Development of a label-free impedance biosensor for detection of antibody-antigen interactions based on a novel conductive linker. Biosens Bioelectron 2010; 26:3072-6. [PMID: 21185166 DOI: 10.1016/j.bios.2010.11.051] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2010] [Revised: 11/28/2010] [Accepted: 11/29/2010] [Indexed: 10/18/2022]
Abstract
We developed a label-free impedance biosensor based on an innovative conductive linker for detecting antibody-antigen interactions. As the often used conventional long chain thiol is a poor conductor, it is not a suitable material for use in a faradaic biosensor. In this study, we adopted a thiophene-based conductive bio-linker to form a self-assembled monolayer and to immobilize the bio-molecules. We used cyclic voltammetry and impedance spectroscopy to verify the enhanced conductivity properties. Results showed that the electron transfer resistance of this new conductive linker was 3 orders of a magnitude lower than for a case using a conventional long chain thiol linker. With the decreased impedance (i.e. increased faradaic current), we can obtain a higher signal/noise ratio such that the detection limit is improved. Using fluorescence microscopy, we verified that our new conductive linker has a protein immobilization capability similar to a conventional long chain thiol linker. Also, using S100 proteins, we verified the protein interaction detection capability of our system. Our obtained results showed a linear dynamic range from 10 ng/ml to 10 μg/ml and a detection limit of 10 ng/ml. With our new conductive linker, an electrochemical impedance biosensor shows great potential to be used for point-of-care applications.
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Affiliation(s)
- Ching-Sung Chen
- Institute of Applied Mechanics, National Taiwan University, Taipei, Taiwan
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45
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Zareh SK, Wang YM. Single-molecule imaging of protein adsorption mechanisms to surfaces. Microsc Res Tech 2010; 74:682-7. [DOI: 10.1002/jemt.20954] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2010] [Accepted: 09/19/2010] [Indexed: 11/09/2022]
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46
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Zhang F, Sautter K, Larsen AM, Findley DA, Davis RC, Samha H, Linford MR. Chemical vapor deposition of three aminosilanes on silicon dioxide: surface characterization, stability, effects of silane concentration, and cyanine dye adsorption. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:14648-14654. [PMID: 20731334 DOI: 10.1021/la102447y] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Covalently bonded monolayers of two monofunctional aminosilanes (3-aminopropyldimethylethoxysilane, APDMES, and 3-aminopropyldiisopropylethoxysilane, APDIPES) and one trifunctional aminosilane (3-aminopropyltriethoxysilane, APTES) have been deposited on dehydrated silicon substrates by chemical vapor deposition (CVD) at 150 °C and low pressure (a few Torr) using reproducible equipment. Standard surface analytical techniques such as x-ray photoelectron spectroscopy (XPS), contact angle goniometry, spectroscopic ellipsometry, atomic force microscopy, and time-of-flight secondary ion mass spectroscopy (ToF-SIMS) have been employed to characterize the resulting films. These methods indicate that essentially constant surface coverages are obtained over a wide range of gas phase concentrations of the aminosilanes. XPS data further indicate that the N1s/Si2p ratio is higher after CVD with the trifunctional silane (APTES) compared to the monofunctional ones, with a higher N1s/Si2p ratio for APDMES compared to that for APDIPES. AFM images show an average surface roughness of 0.12- 0.15 nm among all three aminosilane films. Stability tests indicate that APDIPES films retain most of their integrity at pH 10 for several hours and are more stable than APTES or APDMES layers. The films also showed good stability against storage in the laboratory. ToF-SIMS of these samples showed expected peaks, such as CN(-), as well as CNO(-), which may arise from an interaction between monolayer amine groups and silanols. Optical absorption measurements on adsorbed cyanine dye at the surface of the aminosilane films show the formation of dimer aggregates on the surface. This is further supported by ellipsometry measurements. The concentration of dye on each surface appears to be consistent with the density of the amines.
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Affiliation(s)
- Feng Zhang
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, USA
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Nejadnik MR, Garcia CD. Staining proteins: a simple method to increase the sensitivity of ellipsometric measurements in adsorption studies. Colloids Surf B Biointerfaces 2010; 82:253-7. [PMID: 20833003 DOI: 10.1016/j.colsurfb.2010.08.021] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2010] [Accepted: 08/16/2010] [Indexed: 10/19/2022]
Abstract
This communication describes a simple way to improve the sensitivity of spectroscopic ellipsometry, when applied to monitor the adsorption of proteins to solid surfaces. The method described herein is based on the reaction of a commercially available dye (Coomassie brilliant blue G) with the adsorbed proteins and the subsequent analysis by spectroscopic ellipsometry. In order to demonstrate the potential advantages of this method, the adsorption of bovine serum albumin to an antifouling coating was also investigated. According to our results, the modification with the dye significantly affects the optical properties of the adsorbed protein layer, which can be represented using a simple optical model (Lorentz). In general, the proposed modification increases the sensitivity of the detection by 2.5 ± 0.4-fold and enables the analysis of thin layers of adsorbed protein not obtainable by conventional methods. These results particularly reveal the importance of the proposed modification for the evaluation of low adsorbing substrates and antifouling coatings.
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Affiliation(s)
- M Reza Nejadnik
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA
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48
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Farrell M, Beaudoin S. Surface forces and protein adsorption on dextran- and polyethylene glycol-modified polydimethylsiloxane. Colloids Surf B Biointerfaces 2010; 81:468-75. [PMID: 20801620 DOI: 10.1016/j.colsurfb.2010.07.059] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2009] [Revised: 07/19/2010] [Accepted: 07/20/2010] [Indexed: 10/19/2022]
Abstract
Dextran and polyethylene glycol (PEG) are often covalently bound to the surface of polydimethylsiloxane (PDMS) for the purpose of modifying its hydrophilicity and biocompatibility. In this work, the effects of the dextran and PEG on the morphology, wetting, and surface charge of the resulting surfaces were quantified and correlated with changes in the amount of fibrinogen and albumin adsorbed from aqueous solution. PDMS films were functionalized in a microwave oxygen plasma to create surface hydroxyl groups that were subsequently aminated by incubation in a (3-aminopropyl)trimethoxysilane (APTES) solution. Oxidized dextran and PEG-aldehyde were linked to the surface amines via reductive amination. This process resulted in low surface coverage of immobilized PEG in the end-on conformation and a more uniform and dense distribution of side-on immobilized dextran. The immobilized dextran reduced the contact angle of the PDMS film from 109° to 80° and neutralized the zeta potential over the pH range from 3 to 11. An atomic force microscope was used to measure the interaction force between the modified PDMS and a model hydrophobic surface (polystyrene latex) and a model hydrophilic surface (silica) in aqueous solution to show that van der Waals and hydrophobic attractive forces are the dominant forces for protein adsorption in this system. The PEG- and dextran-modified PDMS were exposed to BSA and fibrinogen to test their resistance to protein adsorption. The coatings were ineffective at reducing the adsorption of either molecule, and the dextran-modification of the PDMS caused more BSA to adsorb than in the case of the unmodified PDMS.
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Affiliation(s)
- Megan Farrell
- Department of Chemical Engineering, Purdue University, 480 Stadium Mall Dr., West Lafayette, IN 47907, United States
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49
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North SH, Lock EH, King TR, Franek JB, Walton SG, Taitt CR. Effect of physicochemical anomalies of soda-lime silicate slides on biomolecule immobilization. Anal Chem 2010; 82:406-12. [PMID: 20000446 DOI: 10.1021/ac902324r] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Glass microscope slides are considered by many as the substrate of choice for microarray manufacturing due to their amenability to various surface chemistry modifications. The use of silanes to attach various functional groups onto glass slides has provided a versatile tool for the covalent immobilization of many diverse biomolecules of interest. We recently noted a dramatic reduction in biomolecule immobilization efficiency on standard microscope slides prepared using a well-characterized silanization method. A survey of commercial soda-lime slides yielded the surprising result that slides purchased prior to 2008 had superior immobilization efficiencies when compared to those purchased after 2008. Characterization of the slides by X-ray photoelectron spectroscopy (XPS), contact angle measurements, and atomic force microscopy (AFM), revealed a significant correlation (R > 0.9) between magnesium content, surface roughness, and bioimmobilization efficiency. High performance slides had higher magnesium content and higher root-mean-square (rms) roughness (P < 0.005) than slides with lower bioimmobilization efficiencies. Although the exact mechanism of how magnesium content and surface roughness affect silane deposition has not yet been defined, we show that recent changes in the chemical and physical properties of commercial soda-lime slides affect the ability of these slides to be covalently modified.
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Affiliation(s)
- Stella H North
- Center for Bio/Molecular Science & Engineering, U.S. Naval Research Laboratory, 4555 Overlook Ave. SW, Washington, D.C. 20375, USA
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Mercey E, Obeïd P, Glaise D, Calvo-Muñoz ML, Guguen-Guillouzo C, Fouqué B. The application of 3D micropatterning of agarose substrate for cell culture and in situ comet assays. Biomaterials 2010; 31:3156-65. [PMID: 20149429 DOI: 10.1016/j.biomaterials.2010.01.020] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2009] [Accepted: 01/08/2010] [Indexed: 10/19/2022]
Abstract
We report the fabrication of a 3D micropatterned agarose substrate that enables the culture of single or multiple cells. Patterning was performed on dried agarose using deep UV irradiation leading to 6-microm-deep micropatterns of 25-70 microm in diameter. Cell adhesion was facilitated by the specific grafting of ECM (extra cellular matrix) proteins such as fibronectin into the micropatterns. We show that the pattern size induced the adhesion of one or more cells, thus allowing precise control of the cell number used in the assay, and that cells proliferated similarly as in standard culture conditions. Moreover, cell polarity appeared well preserved on this substrate, so polarized cells like hepatoma HepaRG cells might maintain their differentiation status and act as primary human hepatocytes for hepatotoxicity testing. These 3D patterned culture slides have been successfully used for in situ comet assays and there is evidence that the genotoxic effects of sub-cytotoxic concentrations of drugs could be analyzed in a large number of single HeLa cells. Coupled with the parallel-based design of the 3D micropatterning, which allows automated image analysis, these results strongly indicate that this new cell array system is suitable for high-throughput cytotoxicity and genotoxicity screening applications.
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Affiliation(s)
- Emilie Mercey
- CEA, DSV, IRTSV, Laboratoire Biopuces, Grenoble, France
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