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Nascimento ATD, Mendes AX, Duchi S, Duc D, Aguilar LC, Quigley AF, Kapsa RMI, Nisbet DR, Stoddart PR, Silva SM, Moulton SE. Wired for Success: Probing the Effect of Tissue-Engineered Neural Interface Substrates on Cell Viability. ACS Biomater Sci Eng 2024; 10:3775-3791. [PMID: 38722625 DOI: 10.1021/acsbiomaterials.4c00111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/15/2024]
Abstract
This study investigates the electrochemical behavior of GelMA-based hydrogels and their interactions with PC12 neural cells under electrical stimulation in the presence of conducting substrates. Focusing on indium tin oxide (ITO), platinum, and gold mylar substrates supporting conductive scaffolds composed of hydrogel, graphene oxide, and gold nanorods, we explored how the substrate materials affect scaffold conductivity and cell viability. We examined the impact of an optimized electrical stimulation protocol on the PC12 cell viability. According to our findings, substrate selection significantly influences conductive hydrogel behavior, affecting cell viability and proliferation as a result. In particular, the ITO substrates were found to provide the best support for cell viability with an average of at least three times higher metabolic activity compared to platinum and gold mylar substrates over a 7 day stimulation period. The study offers new insights into substrate selection as a platform for neural cell stimulation and underscores the critical role of substrate materials in optimizing the efficacy of neural interfaces for biomedical applications. In addition to extending existing work, this study provides a robust platform for future explorations aimed at tailoring the full potential of tissue-engineered neural interfaces.
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Affiliation(s)
- Adriana Teixeira do Nascimento
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Alexandre X Mendes
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Serena Duchi
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- Department of Surgery, University of Melbourne, St Vincent's Hospital, Melbourne, Victoria 3065, Australia
| | - Daniela Duc
- School of Pharmacy and Pharmaceutical Sciences, College of Biomedical and Life Sciences, Cardiff University, Cardiff CF10 3NB, United Kingdom
| | - Lilith C Aguilar
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- The Graeme Clark Institute, The University of Melbourne, Melbourne, Victoria 3010, Australia
- Department of Biomedical Engineering, Faculty of Engineering and Information Technology, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Anita F Quigley
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia
- Department of Medicine, University of Melbourne, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Robert M I Kapsa
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia
- Department of Medicine, University of Melbourne, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - David R Nisbet
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- The Graeme Clark Institute, The University of Melbourne, Melbourne, Victoria 3010, Australia
- Department of Biomedical Engineering, Faculty of Engineering and Information Technology, The University of Melbourne, Melbourne, Victoria 3010, Australia
- Melbourne Medical School, Faculty of Medicine, Dentistry and Health Science, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Paul R Stoddart
- School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Saimon M Silva
- Department of Chemistry and Biochemistry, La Trobe Institute for Molecular Science, The Biomedical and Environmental Sensor Technology Research Centre, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Simon E Moulton
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- Iverson Health Innovation Research Institute, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
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Wahab O, Kang M, Meloni GN, Daviddi E, Unwin PR. Nanoscale Visualization of Electrochemical Activity at Indium Tin Oxide Electrodes. Anal Chem 2022; 94:4729-4736. [PMID: 35255211 PMCID: PMC9007413 DOI: 10.1021/acs.analchem.1c05168] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 02/11/2022] [Indexed: 01/08/2023]
Abstract
Indium tin oxide (ITO) is a popular electrode choice, with diverse applications in (photo)electrocatalysis, organic photovoltaics, spectroelectrochemistry and sensing, and as a support for cell biology studies. Although ITO surfaces exhibit heterogeneous local electrical conductivity, little is known as to how this translates to electrochemistry at the same scale. This work investigates nanoscale electrochemistry at ITO electrodes using high-resolution scanning electrochemical cell microscopy (SECCM). The nominally fast outer-sphere one-electron oxidation of 1,1'-ferrocenedimethanol (FcDM) is used as an electron transfer (ET) kinetic marker to reveal the charge transfer properties of the ITO/electrolyte interface. SECCM measures spatially resolved linear sweep voltammetry at an array of points across the ITO surface, with the topography measured synchronously. Presentation of SECCM data as current maps as a function of potential reveals that, while the entire surface of ITO is electroactive, the ET activity is highly spatially heterogeneous. Kinetic parameters (standard rate constant, k0, and transfer coefficient, α) for FcDM0/+ are assigned from 7200 measurements at sites across the ITO surface using finite element method modeling. Differences of 3 orders of magnitude in k0 are revealed, and the average k0 is about 20 times larger than that measured at the macroscale. This is attributed to macroscale ET being largely limited by lateral conductivity of the ITO electrode under electrochemical operation, rather than ET kinetics at the ITO/electrolyte interface, as measured by SECCM. This study further demonstrates the considerable power of SECCM for direct nanoscale characterization of electrochemical processes at complex electrode surfaces.
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Affiliation(s)
- Oluwasegun
J. Wahab
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Minkyung Kang
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, United Kingdom
- Institute
for Frontier Materials Deakin University, Burwood, Victoria 3125, Australia
| | - Gabriel N. Meloni
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Enrico Daviddi
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Patrick R. Unwin
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, United Kingdom
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3
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Catalysis on Nanostructured Indium Tin Oxide Surface for Fast and Inexpensive Probing of Antibodies during Pandemics. Catalysts 2021. [DOI: 10.3390/catal11020191] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has become a global threat to human health and the economy. Society needs inexpensive, fast, and accurate quantitative diagnostic tools. Here, we report a new approach using a solid-state biosensor to measure antibodies, which does not require functionalization, unlike conventional biosensors. A nanostructured semiconductor surface with catalytic properties was used as a transducer for rapid immobilization and measurement of the antibody. The transducer response was based on solid-state electronics properties. The changes on the surface of the semiconductor induced changes in the direct current (DC) surface resistivity. This was a result of a catalytic chemical reaction on that surface. This new low-cost approach reduced the response time of the measurement significantly, and it required only a very small amount of sample on the microliter scale.
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Moon SH, Cho YW, Shim HE, Choi JH, Jung CH, Hwang IT, Kang SW. Electrically stimulable indium tin oxide plate for long-term in vitro cardiomyocyte culture. Biomater Res 2020; 24:10. [PMID: 32514370 PMCID: PMC7251917 DOI: 10.1186/s40824-020-00189-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Accepted: 05/10/2020] [Indexed: 12/16/2022] Open
Abstract
Background We investigated whether electrical stimulation via indium tin oxide (ITO) could enhance the in vitro culture of neonatal rat ventricular myocytes (NRVMs), which are important in vitro models for studying the mechanisms underlying many aspects of cardiology. Methods Cardiomyocytes were obtained from 1-day-old neonatal rat heart ventricles. To evaluate function of NRVMs cultured on ITO with electrical stimulation, the cell viability, change of cell morphology, immunochemistry using cardiac-specific antibodies, and gene expression were tested. Results Defined sarcomeric structure, cell enlargement, and increased distribution of NRVMs appeared in the presence of electrical stimulation. These characteristics were absent in NRVMs cultured under standard culture conditions. In addition, the expression levels of cardiomyocyte-specific and ion channel markers were higher in NRVMs seeded on ITO-coated dishes than in the control group at 14 days after seeding. ITO-coated dishes could effectively provide electrical cues to support the in vitro culture of NRVMs. Conclusions These results provide supporting evidence that electrical stimulation via ITO can be effectively used to maintain culture and enhance function of cardiomyocytes in vitro.
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Affiliation(s)
- Sung-Hwan Moon
- Department of Medical Science, School of Medicine, Konkuk University, Seoul, South Korea
| | - Young-Woo Cho
- Drug Safety and Toxicity Evaluation Team, New Drug Development Center, Osong Medical Innovation Foundation, Cheongju-Si, Chungbuk South Korea
| | - Hye-Eun Shim
- Research Group for Biomimetic Advanced Technology, Korea Institute of Toxicology, Daejeon, South Korea
| | - Jae-Hak Choi
- Department of Polymer Science and Engineering, Chungnam National University, Daejeon, South Korea
| | - Chan-Hee Jung
- Research Division for Industry and Environment, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeonbuk, South Korea
| | - In-Tae Hwang
- Research Division for Industry and Environment, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeonbuk, South Korea
| | - Sun-Woong Kang
- Research Group for Biomimetic Advanced Technology, Korea Institute of Toxicology, Daejeon, South Korea.,Department of Human and Environmental Toxicology, University of Science and Technology, Daejeon, South Korea
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Rima XY, Walters N, Nguyen LTH, Reátegui E. Surface engineering within a microchannel for hydrodynamic and self-assembled cell patterning. BIOMICROFLUIDICS 2020; 14:014104. [PMID: 31933714 PMCID: PMC6941948 DOI: 10.1063/1.5126608] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 12/18/2019] [Indexed: 05/27/2023]
Abstract
The applications of cell patterning are widespread due to the high-throughput testing and different resolutions offered by these platforms. Cell patterning has aided in deconvoluting in vivo experiments to better characterize cellular mechanisms and increase therapeutic output. Here, we present a technique for engineering an artificial surface via surface chemistry to form large-scale arrays of cells within a microchannel by employing microstamping. By changing the approach in surface chemistry, H1568 cells were patterned hydrodynamically using immunoaffinity, and neutrophils were patterned through self-assembly via chemotaxis. The high patterning efficiencies (93% for hydrodynamic patterning and 68% for self-assembled patterning) and the lack of secondary adhesion demonstrate the reproducibility of the platform. The interaction between H1568 and neutrophils was visualized and quantified to determine the capability of the platform to encourage cell-cell interaction. With the introduction of H1568 cells into the self-assembled patterning platform, a significant hindrance in the neutrophils' ability to swarm was observed, indicating the important roles of inflammatory mediators within the nonsmall cell lung cancer tumor microenvironment.
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Affiliation(s)
- Xilal Y. Rima
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, USA
| | - Nicole Walters
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, USA
| | - Luong T. H. Nguyen
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, USA
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Luan S, Hao R, Wei Y, Chen D, Fan B, Dong F, Guo W, Wang J, Chen J. A microfabricated 96-well wound-healing assay. Cytometry A 2017; 91:1192-1199. [PMID: 29156109 DOI: 10.1002/cyto.a.23286] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 10/23/2017] [Accepted: 11/01/2017] [Indexed: 01/09/2023]
Abstract
This article presents a microfabricated 96-well wound-healing assay enabling high-throughput measurement of cellular migration capabilities. Within each well, the middle area is the wound region, made of microfabricated gold surface with self-assembled PEG repellent for cell seeding. After the formation of a cellular confluent monolayer around the wound region, collagen solution was applied to form three-dimensional matrix to cover the PEG surface, initiating the wound-healing process. By interpreting the numbers of migrated cells into the wound regions as a function of specific stimuli with different concentrations, EC50 (half-maximal effective concentration) was obtained. Using H1299 as a model, values of EC50 were quantified as 8% and 160 ng/ml for fetal bovine serum and CXCL12, respectively. In addition, the values of EC50 were demonstrated not to be affected by variations in compositions of extracellular matrix and geometries of wounds, which can thus be regarded as an intrinsic marker. Furthermore, the migration capabilities of a second cell type (HeLa) were characterized by the developed wound-healing assay, producing EC50 of 2% when fetal bovine serum was used as the stimuli. These results validated the proposed high-throughput wound-healing assay, which may function as an enabling tool in studying cellular capabilities of migration and invasion. © 2017 International Society for Advancement of Cytometry.
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Affiliation(s)
- Shaoliang Luan
- Department of Vascular Surgery, Clinical Division of Surgery, Chinese PLA General Hospital, Beijing 100853, People's Republic of China
| | - Rui Hao
- State Key Laboratory of Transducer Technology, Institute of Electronics of the Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Univesity of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Yuanchen Wei
- State Key Laboratory of Transducer Technology, Institute of Electronics of the Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Deyong Chen
- State Key Laboratory of Transducer Technology, Institute of Electronics of the Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Univesity of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Beiyuan Fan
- State Key Laboratory of Transducer Technology, Institute of Electronics of the Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Univesity of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Fengliang Dong
- CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, People's Republic of China
| | - Wei Guo
- Department of Vascular Surgery, Clinical Division of Surgery, Chinese PLA General Hospital, Beijing 100853, People's Republic of China
| | - Junbo Wang
- State Key Laboratory of Transducer Technology, Institute of Electronics of the Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Univesity of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Jian Chen
- State Key Laboratory of Transducer Technology, Institute of Electronics of the Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Univesity of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
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8
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Okano K, Hsu HY, Li YK, Masuhara H. In situ patterning and controlling living cells by utilizing femtosecond laser. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2016. [DOI: 10.1016/j.jphotochemrev.2016.07.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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9
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Marędziak M, Tomaszewski K, Polinceusz P, Lewandowski D, Marycz K. Static magnetic field enhances the viability and proliferation rate of adipose tissue-derived mesenchymal stem cells potentially through activation of the phosphoinositide 3-kinase/Akt (PI3K/Akt) pathway. Electromagn Biol Med 2016; 36:45-54. [PMID: 27367918 DOI: 10.3109/15368378.2016.1149860] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The aim of this work was to investigate the effects of 0.5T static magnetic field (sMF) on the viability and proliferation rate of human adipose-derived mesenchymal stromal stem cells (hASCs) via activation of the phosphoinositide 3-kinase/Akt (PI3K/Akt) signaling pathway. In a 7-d culture we examined cell growth kinetic and population doubling time (PDT). We also examined cell morphology and the cellular senescence markers level. Exposure to sMF enhanced the viability of these cells. However, the effect was blocked by treating the cells with LY294002, a P13K inhibitor. We compared this effect by Western Blot analysis of Akt protein expression. We also examined whether the cell response on sMF stimulation is dependent on integrin engagement and we measured integrin gene expression. Our results suggest that stimulation using sMF is a viable method to improve hASC viability. sMF is involved in mechanisms associated with controlling cell proliferative potential signaling events.
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Affiliation(s)
- Monika Marędziak
- a Faculty of Veterinary Medicine , University of Environmental and Life Sciences , Wrocław , Poland.,b Faculty of Biology , University of Environmental and Life Sciences , Wrocław , Poland
| | - Krzysztof Tomaszewski
- c Department of Anatomy , Jagiellonian University Medical College , Krakow , Poland.,d Department of Orthopaedics and Trauma Surgery , 5th Military Clinical Hospital and Polyclinic , Krakow , Poland
| | - Paulina Polinceusz
- e Faculty of Biotechnology , Laboratory of Cytobiochemistry, University of Wroclaw , Wrocław , Poland
| | - Daniel Lewandowski
- f Institute of Materials Science and Applied Mechanics, Wroclaw University of Technology , Wrocław , Poland
| | - Krzysztof Marycz
- b Faculty of Biology , University of Environmental and Life Sciences , Wrocław , Poland
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Yao F, Hu H, Xu S, Huo R, Zhao Z, Zhang F, Xu F. Preparation and regulating cell adhesion of anion-exchangeable layered double hydroxide micropatterned arrays. ACS APPLIED MATERIALS & INTERFACES 2015; 7:3882-3887. [PMID: 25654314 DOI: 10.1021/acsami.5b00145] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We describe a reliable preparation of MgAl-layered double hydroxide (MgAl-LDH) micropatterned arrays on gold substrate by combining SO3(-)-terminated self-assembly monolayer and photolithography. The synthesis route is readily extended to prepare LDH arrays on the SO3(-)-terminated polymer-bonded glass substrate amenable for cell imaging. The anion-exchangeable MgAl-LDH micropattern can act both as bioadhesive region for selective cell adhesion and as nanocarrier for drug molecules to regulate cell behaviors. Quantitative analysis of cell adhesion shows that selective HepG2 cell adhesion and spreading are promoted by the micropatterned MgAl-LDH, and also suppressed by methotrexate drug released from the LDH interlayer galleries.
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Affiliation(s)
- Feng Yao
- State Key Laboratory of Chemical Resource Engineering, §Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, College of Materials Science & Engineering, and ⊥Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology , Beijing 100029, China
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11
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Hotchen CE, Maybury IJ, Nelson GW, Foord JS, Holdway P, Marken F. Amplified electron transfer at poly-ethylene-glycol (PEG) grafted electrodes. Phys Chem Chem Phys 2015; 17:11260-8. [DOI: 10.1039/c5cp01244a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Electron transfer at pegylated electrode surfaces is suppressed for Fe(CN)63−/4− and then recovered in the presence of ferrocene-dimethanol.
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Affiliation(s)
| | | | - Geoffrey W. Nelson
- Imperial College London
- Department of Materials
- Royal School of Mines
- London
- UK
| | - John S. Foord
- Chemistry Research Laboratories
- Oxford University
- Oxford OX1 3TA
- UK
| | - Philip Holdway
- Department of Materials
- Oxford University
- Begbroke Science Park
- Oxford OX5 1PF
- UK
| | - Frank Marken
- Department of Chemistry
- University of Bath
- Bath BA2 7AY
- UK
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12
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Gang A, Gabernet G, Renner LD, Baraban L, Cuniberti G. A simple two-step silane-based (bio-) receptor molecule immobilization without additional binding site passivation. RSC Adv 2015. [DOI: 10.1039/c5ra04469c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Immobilizing (bio-) receptor molecules via 3-(triethoxysilyl)propylsuccinic anhydride makes subsequent binding site blocking dispensable, while maintaining receptor specificity for target analytes.
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Affiliation(s)
- A. Gang
- Institute for Materials Science and Max Bergmann Center of Biomaterials TU Dresden
- 01062 Dresden
- Germany
- Center for Advancing Electronics Dresden
- TU Dresden
| | - G. Gabernet
- Institute for Materials Science and Max Bergmann Center of Biomaterials TU Dresden
- 01062 Dresden
- Germany
| | - L. D. Renner
- Institute for Materials Science and Max Bergmann Center of Biomaterials TU Dresden
- 01062 Dresden
- Germany
- Leibniz Institute of Polymer Research Dresden and the Max-Bergmann Center of Biomaterials
- 01069 Dresden
| | - L. Baraban
- Institute for Materials Science and Max Bergmann Center of Biomaterials TU Dresden
- 01062 Dresden
- Germany
| | - G. Cuniberti
- Institute for Materials Science and Max Bergmann Center of Biomaterials TU Dresden
- 01062 Dresden
- Germany
- Center for Advancing Electronics Dresden
- TU Dresden
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Seto H, Kamba S, Kondo T, Hasegawa M, Nashima S, Ehara Y, Ogawa Y, Hoshino Y, Miura Y. Metal mesh device sensor immobilized with a trimethoxysilane-containing glycopolymer for label-free detection of proteins and bacteria. ACS APPLIED MATERIALS & INTERFACES 2014; 6:13234-13241. [PMID: 25014128 DOI: 10.1021/am503003v] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Biosensors for the detection of proteins and bacteria have been developed using glycopolymer-immobilized metal mesh devices. The trimethoxysilane-containing glycopolymer was immobilized onto a metal mesh device using the silane coupling reaction. The surface shape and transmittance properties of the original metal mesh device were maintained following the immobilization of the glycopolymer. The mannose-binding protein (concanavalin A) could be detected at concentrations in the range of 10(-9) to 10(-6) mol L(-1) using the glycopolymer-immobilized metal mesh device sensor, whereas another protein (bovine serum albumin) was not detected. A detection limit of 1 ng mm(-2) was achieved for the amount of adsorbed concanavalin A. The glycopolymer-immobilized metal mesh device sensor could also detect bacteria as well as protein. The mannose-binding strain of Escherichia coli was specifically detected by the glycopolymer-immobilized metal mesh device sensor. The glycopolymer-immobilized metal mesh device could therefore be used as a label-free biosensor showing high levels of selectivity and sensitivity toward proteins and bacteria.
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Affiliation(s)
- Hirokazu Seto
- Graduate School of Engineering, Kyushu University , 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
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Clausmeyer J, Schuhmann W, Plumeré N. Electrochemical patterning as a tool for fabricating biomolecule microarrays. Trends Analyt Chem 2014. [DOI: 10.1016/j.trac.2014.03.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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15
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Modification of silicon oxide surfaces by monolayers of an oligoethylene glycol-terminated perfluoroalkyl silane. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.02.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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16
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Kemmerling S, Arnold SA, Bircher BA, Sauter N, Escobedo C, Dernick G, Hierlemann A, Stahlberg H, Braun T. Single-cell lysis for visual analysis by electron microscopy. J Struct Biol 2013; 183:467-473. [PMID: 23816812 DOI: 10.1016/j.jsb.2013.06.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 06/20/2013] [Accepted: 06/24/2013] [Indexed: 01/22/2023]
Abstract
The stochastic nature of biological systems makes the study of individual cells a necessity in systems biology. Yet, handling and disruption of single cells and the analysis of the relatively low concentrations of their protein components still challenges available techniques. Transmission electron microscopy (TEM) allows for the analysis of proteins at the single-molecule level. Here, we present a system for single-cell lysis under light microscopy observation, followed by rapid uptake of the cell lysate. Eukaryotic cells were grown on conductively coated glass slides and observed by light microscopy. A custom-designed microcapillary electrode was used to target and lyse individual cells with electrical pulses. Nanoliter volumes were subsequently aspirated into the microcapillary and dispensed onto an electron microscopy grid for TEM inspection. We show, that the cell lysis and preparation method conserves protein structures well and is suitable for visual analysis by TEM.
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Affiliation(s)
- Simon Kemmerling
- Center for Cellular Imaging and Nano Analytics (C-CINA), Biozentrum, University of Basel, Basel, Switzerland
| | - Stefan A Arnold
- Center for Cellular Imaging and Nano Analytics (C-CINA), Biozentrum, University of Basel, Basel, Switzerland
| | - Benjamin A Bircher
- Center for Cellular Imaging and Nano Analytics (C-CINA), Biozentrum, University of Basel, Basel, Switzerland
| | - Nora Sauter
- Center for Cellular Imaging and Nano Analytics (C-CINA), Biozentrum, University of Basel, Basel, Switzerland
| | - Carlos Escobedo
- Bio Engineering Laboratory (BEL), Department of Biosystems Science and Engineering (D-BSSE), ETH Zurich, Basel, Switzerland
| | - Gregor Dernick
- Discovery Technologies, Pharma Research and Early Development (pRED), F. Hoffmann-La Roche AG, Basel, Switzerland
| | - Andreas Hierlemann
- Bio Engineering Laboratory (BEL), Department of Biosystems Science and Engineering (D-BSSE), ETH Zurich, Basel, Switzerland
| | - Henning Stahlberg
- Center for Cellular Imaging and Nano Analytics (C-CINA), Biozentrum, University of Basel, Basel, Switzerland
| | - Thomas Braun
- Center for Cellular Imaging and Nano Analytics (C-CINA), Biozentrum, University of Basel, Basel, Switzerland.
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17
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Local control of protein binding and cell adhesion by patterned organic thin films. Anal Bioanal Chem 2013; 405:3673-91. [DOI: 10.1007/s00216-013-6748-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2012] [Revised: 01/08/2013] [Accepted: 01/14/2013] [Indexed: 12/18/2022]
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18
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Micrometer and Nanometer Scale Photopatterning of Proteins on Glass Surfaces by Photo-degradation of Films Formed from Oligo(Ethylene Glycol) Terminated Silanes. Biointerphases 2012; 7:54. [DOI: 10.1007/s13758-012-0054-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Accepted: 08/10/2012] [Indexed: 11/25/2022] Open
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19
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Underhill GH, Peter G, Chen CS, Bhatia SN. Bioengineering Methods for Analysis of Cells In Vitro. Annu Rev Cell Dev Biol 2012; 28:385-410. [DOI: 10.1146/annurev-cellbio-101011-155709] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | - Galie Peter
- Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Christopher S. Chen
- Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Sangeeta N. Bhatia
- Division of Health Sciences and Technology,
- Department of Electrical Engineering and Computer Science,
- The Howard Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139;
- Division of Medicine, Brigham and Women's Hospital, Boston, Massachusetts 02115
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20
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Seto H, Takara M, Yamashita C, Murakami T, Hasegawa T, Hoshino Y, Miura Y. Surface modification of siliceous materials using maleimidation and various functional polymers synthesized by reversible addition-fragmentation chain transfer polymerization. ACS APPLIED MATERIALS & INTERFACES 2012; 4:5125-5133. [PMID: 23013607 DOI: 10.1021/am301637q] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A novel surface modification method was investigated. The surface of siliceous materials was modified using polystyrene, poly(acrylic acid), poly(N-isopropylacrylamide), and poly(p-acrylamidophenyl-α-mannoside) synthesized by reversible addition-fragmentation chain transfer polymerization. Thiol-terminated polymers were obtained by reduction of the thiocarbonate group using sodium borohydride. The polymers were immobilized on the surface via the thiol-ene click reaction, known as the Michael addition reaction. Immobilization of the polymers on the maleimidated surface was confirmed by X-ray photoelectron spectroscopy, infrared spectroscopy, and contact angle measurements. The polymer-immobilized surfaces were observed by atomic force microscopy, and the thickness of the polymer layers was determined by ellipsometry. The thickness of the polymer immobilized by the maleimide-thiol reaction was less than that formed by spin coating, except for polystyrene. Moreover, the polymer-immobilized surfaces were relatively smooth with a roughness of less than 1 nm. The amounts of amine, maleimide, and polymer immobilized on the surface were determined by quartz crystal microbalance measurements. The area occupied by the amine-containing silane coupling reagent was significantly less than the theoretical value, suggesting that a multilayer of the silane coupling reagent was formed on the surface. The polymer with low molecular weight had the tendency to efficiently immobilize on the maleimidated surface. When poly(p-acrylamidophenyl-α-mannoside)-immobilized surfaces were used as a platform for protein microarrays, strong interactions were detected with the mannose-binding lectin concanavalin A. The specificity of poly(p-acrylamidophenyl-α-mannoside)-immobilized surfaces for concanavalin A was compared with poly-l-lysine-coated surfaces. The poly-l-lysine-coated surfaces nonspecifically adsorbed both concanavalin A and bovine serum albumin, while the poly(p-acrylamidophenyl-α-mannoside)-immobilized surface preferentially adsorbed concanavalin A. Moreover, the poly(p-acrylamidophenyl-α-mannoside)-immobilized surface was applied to micropatterning with photolithography. When the micropattern was formed on the poly(p-acrylamidophenyl-α-mannoside)-spin-coated surface by irradiation with ultraviolet light, the pattern of the masking design was not observed on the surface adsorbed with fluorophore-labeled concanavalin A using a fluorescent microscope because of elution of poly(p-acrylamidophenyl-α-mannoside) from the surface. In contrast, fluorophore-labeled concanavalin A was only adsorbed on the shaded region of the poly(p-acrylamidophenyl-α-mannoside)-immobilized surface, resulting in a distinctive fluorescent pattern. The surface modification method using maleimidation and reversible addition-fragmentation chain transfer polymerization can be used for preparing platforms for microarrays and micropatterning of proteins.
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Affiliation(s)
- Hirokazu Seto
- Department of Chemical Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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21
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Li Y, Giesbers M, Gerth M, Zuilhof H. Generic top-functionalization of patterned antifouling zwitterionic polymers on indium tin oxide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:12509-12517. [PMID: 22888834 DOI: 10.1021/la3022563] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
This paper presents a novel surface engineering approach that combines photochemical grafting and surface-initiated atom transfer radical polymerization (SI-ATRP) to attach zwitterionic polymer brushes onto indium tin oxide (ITO) substrates. The photochemically grafted hydroxyl-terminated organic layer serves as an excellent platform for initiator attachment, and the zwitterionic polymer generated via subsequent SI-ATRP exhibits very good antifouling properties. Patterned polymer coatings can be obtained when the surface with covalently attached initiator was subjected to photomasked UV-irradiation, in which the C-Br bond that is present in the initiator was broken upon exposure to UV light. A further, highly versatile top-functionalization of the zwitterionic polymer brush was achieved by a strain-promoted alkyne-azide cycloaddition, without compromising its antifouling property. The attached bioligand (here: biotin) enables the specific immobilization of target proteins in a spatially confined fashion, pointing to future applications of this approach in the design of micropatterned sensing platforms on ITO substrates.
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Affiliation(s)
- Yan Li
- Laboratory of Organic Chemistry, Wageningen University, Wageningen, The Netherlands
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22
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Li Y, Zuilhof H. Photochemical grafting and patterning of organic monolayers on indium tin oxide substrates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:5350-5359. [PMID: 22324432 DOI: 10.1021/la204980f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Covalently attached organic layers on indium tin oxide (ITO) surfaces were prepared by the photochemical grafting with 1-alkenes. The surface modification was monitored with static water contact angle, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) measurements. Hydrophobic methyl-terminated ITO surfaces can be obtained via the grafting of tetradec-1-ene, whereas the attachment of ω-functionalized 1-alkenes leads to functionalized ITO surfaces. The use of a C≡C-Ge(CH(3))(3) terminus allows for facile tagging of the surface with an azido group via a one-pot deprotection/click reaction, resulting in bio/electronically active interfaces. The combination of nonaggressive chemicals (alkenes), mild reaction conditions (room temperature), and a light-induced grafting that facilitates the direct patterning of organic layers makes this simple approach highly promising for the development of ITO-based (bio)electronic devices.
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Affiliation(s)
- Yan Li
- Laboratory of Organic Chemistry, Wageningen University, Dreijenplein 8, 6703 HB Wageningen, The Netherlands
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23
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Bogojevic D, Chamberlain MD, Barbulovic-Nad I, Wheeler AR. A digital microfluidic method for multiplexed cell-based apoptosis assays. LAB ON A CHIP 2012; 12:627-34. [PMID: 22159547 DOI: 10.1039/c2lc20893h] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Digital microfluidics (DMF), a fluid-handling technique in which picolitre-microlitre droplets are manipulated electrostatically on an array of electrodes, has recently become popular for applications in chemistry and biology. DMF devices are reconfigurable, have no moving parts, and are compatible with conventional high-throughput screening infrastructure (e.g., multiwell plate readers). For these and other reasons, digital microfluidics has been touted as being a potentially useful new tool for applications in multiplexed screening. Here, we introduce the first digital microfluidic platform used to implement parallel-scale cell-based assays. A fluorogenic apoptosis assay for caspase-3 activity was chosen as a model system because of the popularity of apoptosis as a target for anti-cancer drug discovery research. Dose-response profiles of caspase-3 activity as a function of staurosporine concentration were generated using both the digital microfluidic method and conventional techniques (i.e., pipetting, aspiration, and 96-well plates.) As expected, the digital microfluidic method had a 33-fold reduction in reagent consumption relative to the conventional technique. Although both types of methods used the same detector (a benchtop multiwell plate reader), the data generated by the digital microfluidic method had lower detection limits and greater dynamic range because apoptotic cells were much less likely to de-laminate when exposed to droplet manipulation by DMF relative to pipetting/aspiration in multiwell plates. We propose that the techniques described here represent an important milestone in the development of digital microfluidics as a useful tool for parallel cell-based screening and other applications.
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Affiliation(s)
- Dario Bogojevic
- Institute for Biomaterials and Biomedical Engineering, University of Toronto, 164 College St., Toronto, ON M5S 3G9, Canada
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24
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Seto H, Ogata Y, Murakami T, Hoshino Y, Miura Y. Selective protein separation using siliceous materials with a trimethoxysilane-containing glycopolymer. ACS APPLIED MATERIALS & INTERFACES 2012; 4:411-7. [PMID: 22148732 DOI: 10.1021/am2014713] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A copolymer with α-D-mannose (Man) and trimethoxysilane (TMS) units was synthesized for immobilization on siliceous matrices such as a sensor cell and membrane. Immobilization of the trimethoxysilane-containing copolymer on the matrices was readily performed by incubation at high heat. The recognition of lectin by poly(Man-r-TMS) was evaluated by measurement with a quartz crystal microbalance (QCM) and adsorption on an affinity membrane, QCM results showed that the mannose-binding protein, concanavalin A, was specifically bound on a poly(Man-r-TMS)-immobilized cell with a higher binding constant than bovine serum albumin. The amount of concanavalin A adsorbed during permeation through a poly(Man-r-TMS)-immobilized membrane was higher than that through an unmodified membrane. Moreover, the concanavalin A adsorbed onto the poly(Man-r-TMS)-immobilized membrane was recoverable by permeation of a mannose derivative at high concentration.
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Affiliation(s)
- Hirokazu Seto
- Department of Chemical Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan
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25
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Szili EJ, Al-Bataineh SA, Ruschitzka P, Desmet G, Priest C, Griesser HJ, Voelcker NH, Harding FJ, Steele DA, Short RD. Microplasma arrays: a new approach for maskless and localized patterning of materials surfaces. RSC Adv 2012. [DOI: 10.1039/c2ra21504g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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26
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Shah SS, Kim M, Foster E, Vu T, Patel D, Chen LJ, Verkhoturov SV, Schweikert E, Tae G, Revzin A. Electrochemical release of hepatocyte-on-hydrogel microstructures from ITO substrates. Anal Bioanal Chem 2011; 402:1847-56. [DOI: 10.1007/s00216-011-5613-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2011] [Revised: 11/23/2011] [Accepted: 11/24/2011] [Indexed: 01/09/2023]
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27
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Au AY, Hasenwinkel JM, Frondoza CG. Micropatterned agarose scaffolds covalently modified with collagen for culture of normal and neoplastic hepatocytes. J Biomed Mater Res A 2011; 100:342-52. [DOI: 10.1002/jbm.a.33277] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2011] [Accepted: 09/12/2011] [Indexed: 11/08/2022]
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28
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Chen LJ, Seo JH, Eller MJ, Verkhoturov SV, Shah SS, Revzin A, Schweikert EA. Quantitative label-free characterization of avidin-biotin assemblies on silanized glass. Anal Chem 2011; 83:7173-8. [PMID: 21842883 PMCID: PMC3186069 DOI: 10.1021/ac2016085] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this study, a time-of-flight secondary ion mass spectrometer TOF-SIMS, operating in the event-by-event bombardment/detection mode was used to characterize avidin-biotin assemblies on silane-modified glass substrates. SIMS was used to analyze several variants of the biointerface, including avidin physically adsorbed on a monofunctional acryl silane surface and covalently attached on monofunctional (amine terminated) and bifunctional (amine and acryl terminated) silanes. The goal of these studies was to determine density of avidin and biotin layers chemically or physically adsorbed on silanized glass substrate. An individual impact of a C(60) projectile used in this study creates a hemispherical crater (∼10 nm in diameter) and emits large numbers of secondary ions from the same nanovolume. Thus, a single impact enables one to unfold distinct secondary ions that span the thickness of the assembled film. This method was used to monitor the presence of glass, silane, and protein ions and to estimate the thickness and density of the avidin layer. In addition, we employed the double coincidence mass spectrometry approach to identify ions coemitted from a specific stratum of the biointerface. This approach was used to determine density of biotin and avidin immobilization while eliminating interferences from isobaric ions that originated from other constituents on the surface. Overall, novel TOF-SIMS quantitative approaches employed here were useful for examining complex biointerfaces and determining both lateral and in depth composition of the film.
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Affiliation(s)
- Li-Jung Chen
- Department of Chemistry, Texas A&M University, College Station, TX, USA
| | - Jeong Hyun Seo
- Department of Biomedical Engineering, University of California, Davis, CA, USA
| | - Michael J. Eller
- Department of Chemistry, Texas A&M University, College Station, TX, USA
| | | | - Sunny S. Shah
- Department of Biomedical Engineering, University of California, Davis, CA, USA
| | - Alexander Revzin
- Department of Biomedical Engineering, University of California, Davis, CA, USA
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29
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Hardelauf H, Sisnaiske J, Taghipour-Anvari AA, Jacob P, Drabiniok E, Marggraf U, Frimat JP, Hengstler JG, Neyer A, van Thriel C, West J. High fidelity neuronal networks formed by plasma masking with a bilayer membrane: analysis of neurodegenerative and neuroprotective processes. LAB ON A CHIP 2011; 11:2763-71. [PMID: 21709920 DOI: 10.1039/c1lc20257j] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Spatially defined neuronal networks have great potential to be used in a wide spectrum of neurobiology assays. We present an original technique for the precise and reproducible formation of neuronal networks. A PDMS membrane comprising through-holes aligned with interconnecting microchannels was used during oxygen plasma etching to dry mask a protein rejecting poly(ethylene glycol) (PEG) adlayer. Patterns were faithfully replicated to produce an oxidized interconnected array pattern which supported protein adsorption. Differentiated human SH-SY5Y neuron-like cells adhered to the array nodes with the micron-scale interconnecting tracks guiding neurite outgrowth to produce neuronal connections and establish a network. A 2.0 μm track width was optimal for high-level network formation and node compliance. These spatially standardized neuronal networks were used to analyse the dynamics of acrylamide-induced neurite degeneration and the protective effects of co-treatment with calpeptin or brain derived neurotrophic factor (BDNF).
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Affiliation(s)
- Heike Hardelauf
- Leibniz Institut für Analytische Wissenschaften-ISAS-e.V., Otto-Hahn-Str. 6b, 44227 Dortmund, Germany
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30
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Electrochemical desorption of self-assembled monolayers and its applications in surface chemistry and cell biology. J Electroanal Chem (Lausanne) 2011. [DOI: 10.1016/j.jelechem.2010.11.008] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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31
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Chen LJ, Shah SS, Silangcruz J, Eller MJ, Verkhoturov SV, Revzin A, Schweikert EA. Characterization and Quantification of Nanoparticle-Antibody Conjugates on Cells Using C(60) ToF SIMS in the Event-By-Event Bombardment/Detection Mode. INTERNATIONAL JOURNAL OF MASS SPECTROMETRY 2011; 303:97-102. [PMID: 21691427 PMCID: PMC3117593 DOI: 10.1016/j.ijms.2011.01.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Cluster C(60) ToF-SIMS (time-of-flight secondary ion mass spectrometry) operated in the event-by-event bombardment-detection method has been applied to: a) quantify the binding density of Au nanoparticles (AuNPs)-antiCD4 conjugates on the cell surface; b) identify the binding sites between AuNPs and antibody. Briefly, our method consists of recording the secondary ions, SIs, individually emitted from a single C(60) (1,2+) impact. From the cumulative mass spectral data we selected events where a specific SI was detected. The selected records revealed the SIs co-ejected from the nanovolume impacted by an individual C(60) with an emission area of ~ 10nm in diameter as an emission depth of 5-10 nm. The fractional coverage is obtained as the ratio of the effective number of projectile impacts on a specified sampling area (N(e)) to the total number of impacts (N(0)). In the negative ion mass spectrum, the palmitate (C(16)H(31)O(2) (-)) and oletate (C(18)H(33)O(2) (-)) fatty acid ions present signals from lipid membrane of the cells. The signals at m/z 197 (Au(-)) and 223 (AuCN(-)) originate from the AuNPs labeled antibodies (antiCD4) bound to the cell surface antigens. The characteristic amino acid ions validate the presence of antiCD4. A coincidence mass spectrum extracted with ion at m/z 223 (AuCN(-)) reveals the presence of cysteine at m/z 120, documenting the closeness of cysteine and the AuNP. Their proximity suggests that the binding site for AuNP on the antibody is the sulfur-terminal cysteine. The fractional coverage of membrane lipid was determined to be ~23% of the cell surfaces while the AuNPs was found to be ~21%. The novel method can be implemented on smaller size NPs, it should thus be applicable for studies on size dependent binding of NP-antibody conjugates.
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Affiliation(s)
- Li-Jung Chen
- Department of Chemistry, Texas A&M University, College Station, TX, USA
| | - Sunny S. Shah
- Department of Biomedical Engineering, University of California, Davis, CA, USA
| | - Jaime Silangcruz
- Department of Biomedical Engineering, University of California, Davis, CA, USA
| | - Michael J. Eller
- Department of Chemistry, Texas A&M University, College Station, TX, USA
| | | | - Alexander Revzin
- Department of Biomedical Engineering, University of California, Davis, CA, USA
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32
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Diethert A, Ecker K, Peykova Y, Willenbacher N, Müller-Buschbaum P. Tailoring the near-surface composition profiles of pressure-sensitive adhesive films and the resulting mechanical properties. ACS APPLIED MATERIALS & INTERFACES 2011; 3:2012-2021. [PMID: 21604786 DOI: 10.1021/am200254m] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We present a possibility of tailoring the near-surface composition profiles of pressure sensitive adhesive (PSA) films by an exposure to atmospheres of different relative humidities (RHs). The statistical copolymer P(EHA-stat-20MMA) with a majority of ethylhexylacrylate (EHA) and a minority of methylmethacrylate (MMA), being cast from a toluene based solution, is chosen as a model system. The near-surface composition profile is probed with X-ray reflectivity. All probed samples show an enrichment of PMMA at the sample surface; however, the near-surface PMMA content strongly increases with increasing RH. The influence of the RH on the composition profile is present down to a depth of 50 nm. Therefore the surface tensions being derived from contact angle measurements do not show any measurable humidity dependence. In contrast, in a mechanical tack test with a smooth punch surface, a strong influence is probed. This observation can be explained by considering the integrated PMMA content over an appropriate near-surface region and the resulting impact on the cavitation process.
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Affiliation(s)
- Alexander Diethert
- Technische Universität München, Physik-Department E13, Lehrstuhl für Funktionelle Materialien, James-Franck-Strasse 1, 85747 Garching, Germany
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33
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Surface-grafted block copolymer brushes with continuous composition gradients of poly(poly(ethylene glycol)-monomethacrylate) and poly(N-isopropylacrylamide). Sci China Chem 2011. [DOI: 10.1007/s11426-010-4192-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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34
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Pan T, Wang W. From cleanroom to desktop: emerging micro-nanofabrication technology for biomedical applications. Ann Biomed Eng 2011; 39:600-20. [PMID: 21161384 PMCID: PMC3033514 DOI: 10.1007/s10439-010-0218-9] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2010] [Accepted: 11/20/2010] [Indexed: 12/14/2022]
Abstract
This review is motivated by the growing demand for low-cost, easy-to-use, compact-size yet powerful micro-nanofabrication technology to address emerging challenges of fundamental biology and translational medicine in regular laboratory settings. Recent advancements in the field benefit considerably from rapidly expanding material selections, ranging from inorganics to organics and from nanoparticles to self-assembled molecules. Meanwhile a great number of novel methodologies, employing off-the-shelf consumer electronics, intriguing interfacial phenomena, bottom-up self-assembly principles, etc., have been implemented to transit micro-nanofabrication from a cleanroom environment to a desktop setup. Furthermore, the latest application of micro-nanofabrication to emerging biomedical research will be presented in detail, which includes point-of-care diagnostics, on-chip cell culture as well as bio-manipulation. While significant progresses have been made in the rapidly growing field, both apparent and unrevealed roadblocks will need to be addressed in the future. We conclude this review by offering our perspectives on the current technical challenges and future research opportunities.
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Affiliation(s)
- Tingrui Pan
- Micro-Nano Innovations (MiNI) Laboratory, Department of Biomedical Engineering, University of California, Davis, CA, USA.
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35
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Zhao S, Chen A, Revzin A, Pan T. Stereomask lithography (SML): a universal multi-object micro-patterning technique for biological applications. LAB ON A CHIP 2011; 11:224-30. [PMID: 21113523 DOI: 10.1039/c0lc00275e] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The advent of biological micro-patterning techniques has given new impetus to many areas of biological research, including quantitative biochemical analysis, tissue engineering, biosensing, and regenerative medicine. Derived from photolithography or soft lithography, current bio-patterning approaches have yet to completely address the needs of out-of-cleanroom, universal applicability, high feature resolution, as well as multi-object placement, though many have shown great promise to precisely pattern one specific biomaterial. In this paper, we present a novel versatile biological lithography technique to achieve integrated multi-object patterning with high feature resolution and high adaptability to various biomaterials, referred to as stereomask lithography (SML). Successive patterning of multiple objects is enabled by using unique three-dimensional masks (i.e., the stereomasks), which lay out current micropatterns while protecting pre-existing biological features on the substrate. Furthermore, high-precision reversible alignment among multiple bio-objects is achieved by adopting a peg-in-hole design between the substrate and stereomasks. We demonstrate that the SML technique is capable of constructing a complex biological microenvironment with various bio-functional components at the single-cell resolution, which to the best of our knowledge has not been realized before.
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Affiliation(s)
- Siwei Zhao
- Micro-Nano Innovations (MiNI) Laboratory, Department of Biomedical Engineering, University of California, Davis, CA, USA
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36
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Joddar B, Ito Y. Biological modifications of materials surfaces with proteins for regenerative medicine. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10984g] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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37
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Electrochemically switchable platform for the micro-patterning and release of heterotypic cell sheets. Biomed Microdevices 2010; 13:221-30. [DOI: 10.1007/s10544-010-9487-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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38
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Photoactive SAM surface for control of cell attachment. J Colloid Interface Sci 2010; 348:71-9. [DOI: 10.1016/j.jcis.2010.04.032] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2010] [Revised: 04/10/2010] [Accepted: 04/13/2010] [Indexed: 12/13/2022]
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39
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Herzer N, Hoeppener S, Schubert US. Fabrication of patterned silane based self-assembled monolayers by photolithography and surface reactions on silicon-oxide substrates. Chem Commun (Camb) 2010; 46:5634-52. [DOI: 10.1039/c0cc00674b] [Citation(s) in RCA: 129] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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