1
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Jain K, Pandey A, Wang H, Chung T, Nemati A, Kanchanawong P, Sheetz MP, Cai H, Changede R. TiO 2 Nano-Biopatterning Reveals Optimal Ligand Presentation for Cell-Matrix Adhesion Formation. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2309284. [PMID: 38340044 PMCID: PMC11126362 DOI: 10.1002/adma.202309284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Revised: 01/31/2024] [Indexed: 02/12/2024]
Abstract
Nanoscale organization of transmembrane receptors is critical for cellular functions, enabled by the nanoscale engineering of bioligand presentation. Previously, a spatial threshold of ≤60 nm for integrin binding ligands in cell-matrix adhesion is demonstrated using monoliganded gold nanoparticles. However, the ligand geometric arrangement is limited to hexagonal arrays of monoligands, while plasmonic quenching limits further investigation by fluorescence-based high-resolution imaging. Here, these limitations are overcome with dielectric TiO2 nanopatterns, eliminating fluorescence quenching, thus enabling super-resolution fluorescence microscopy on nanopatterns. By dual-color super-resolution imaging, high precision and consistency among nanopatterns, bioligands, and integrin nanoclusters are observed, validating the high quality and integrity of both nanopattern functionalization and passivation. By screening TiO2 nanodiscs with various diameters, an increase in fibroblast cell adhesion, spreading area, and Yes-associated protein (YAP) nuclear localization on 100 nm diameter compared with smaller diameters was observed. Focal adhesion kinase is identified as the regulatory signal. These findings explore the optimal ligand presentation when the minimal requirements are sufficiently fulfilled in the heterogenous extracellular matrix network of isolated binding regions with abundant ligands. Integration of high-fidelity nano-biopatterning with super-resolution imaging allows precise quantitative studies to address early signaling events in response to receptor clustering and their nanoscale organization.
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Affiliation(s)
- Kashish Jain
- Mechanobiology Institute, National University of Singapore, Singapore, Singapore
| | - Ashish Pandey
- Tech4Health Institute and Department of Radiology, NYU Langone Health, New York, NY, USA
| | - Hao Wang
- Tech4Health Institute and Department of Radiology, NYU Langone Health, New York, NY, USA
| | - Taerin Chung
- Tech4Health Institute and Department of Radiology, NYU Langone Health, New York, NY, USA
| | - Arash Nemati
- Tech4Health Institute and Department of Radiology, NYU Langone Health, New York, NY, USA
| | - Pakorn Kanchanawong
- Mechanobiology Institute, National University of Singapore, Singapore, Singapore
- Department of Biomedical Engineering, National University of Singapore, Singapore, Singapore
| | - Michael P. Sheetz
- Mechanobiology Institute, National University of Singapore, Singapore, Singapore
- Molecular Mechanomedicine Program, Biochemistry and Molecular Biology Department, University of Texas Medical Branch, Galveston, TX, USA
| | - Haogang Cai
- Tech4Health Institute and Department of Radiology, NYU Langone Health, New York, NY, USA
- Department of Biomedical Engineering, New York University, Brooklyn, NY, USA
| | - Rishita Changede
- Mechanobiology Institute, National University of Singapore, Singapore, Singapore
- TeOra Pte. Ltd, Singapore, Singapore
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2
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Ma VPY, Hu Y, Kellner AV, Brockman JM, Velusamy A, Blanchard AT, Evavold BD, Alon R, Salaita K. The magnitude of LFA-1/ICAM-1 forces fine-tune TCR-triggered T cell activation. SCIENCE ADVANCES 2022; 8:eabg4485. [PMID: 35213231 PMCID: PMC8880789 DOI: 10.1126/sciadv.abg4485] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Accepted: 12/15/2021] [Indexed: 05/15/2023]
Abstract
T cells defend against cancer and viral infections by rapidly scanning the surface of target cells seeking specific peptide antigens. This key process in adaptive immunity is sparked upon T cell receptor (TCR) binding of antigens within cell-cell junctions stabilized by integrin (LFA-1)/intercellular adhesion molecule-1 (ICAM-1) complexes. A long-standing question in this area is whether the forces transmitted through the LFA-1/ICAM-1 complex tune T cell signaling. Here, we use spectrally encoded DNA tension probes to reveal the first maps of LFA-1 and TCR forces generated by the T cell cytoskeleton upon antigen recognition. DNA probes that control the magnitude of LFA-1 force show that F>12 pN potentiates antigen-dependent T cell activation by enhancing T cell-substrate engagement. LFA-1/ICAM-1 mechanical events with F>12 pN also enhance the discriminatory power of the TCR when presented with near cognate antigens. Overall, our results show that T cells integrate multiple channels of mechanical information through different ligand-receptor pairs to tune function.
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Affiliation(s)
| | - Yuesong Hu
- Department of Chemistry, Emory University, Atlanta, GA 30322, USA
| | - Anna V. Kellner
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Emory University, Atlanta, GA 30332, USA
| | - Joshua M. Brockman
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Emory University, Atlanta, GA 30332, USA
| | - Arventh Velusamy
- Department of Chemistry, Emory University, Atlanta, GA 30322, USA
| | - Aaron T. Blanchard
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Emory University, Atlanta, GA 30332, USA
| | - Brian D. Evavold
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT 84112, USA
| | - Ronen Alon
- Department of Immunology, The Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Khalid Salaita
- Department of Chemistry, Emory University, Atlanta, GA 30322, USA
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Emory University, Atlanta, GA 30332, USA
- Winship Cancer Institute, Emory University, Atlanta, GA 30322, USA
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3
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Urban P, Pritzl SD, Ober MF, Dirscherl CF, Pernpeintner C, Konrad DB, Frank JA, Trauner D, Nickel B, Lohmueller T. A Lipid Photoswitch Controls Fluidity in Supported Bilayer Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:2629-2634. [PMID: 32069411 DOI: 10.1021/acs.langmuir.9b02942] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Supported lipid bilayer (SLB) membranes are key elements to mimic membrane interfaces on a planar surface. Here, we demonstrate that azobenzene photolipids (azo-PC) form fluid, homogeneous SLBs. Diffusion properties of azo-PC within SLBs were probed by fluorescence microscopy and fluorescence recovery after photobleaching. At ambient conditions, we find that the trans-to-cis isomerization causes an increase of the diffusion constant by a factor of two. Simultaneous excitation with two wavelengths and variable intensities furthermore allows to adjust the diffusion constant D continuously. X-ray reflectometry and small-angle scattering measurements reveal that membrane photoisomerization results in a bilayer thickness reduction of ∼0.4 nm (or 10%). While thermally induced back-switching is not observed, we find that the trans bilayer fluidity is increasing with higher temperatures. This change in diffusion constant is accompanied by a red-shift in the absorption spectra. Based on these results, we suggest that the reduced diffusivity of trans-azo-PC is controlled by intermolecular interactions that also give rise to H-aggregate formation in bilayer membranes.
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Affiliation(s)
- Patrick Urban
- Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstrasse 10, 80539 Munich, Germany
| | - Stefanie D Pritzl
- Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstrasse 10, 80539 Munich, Germany
| | - Martina F Ober
- Faculty of Physics and CeNS, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 Munich, Germany
| | - Christina F Dirscherl
- Faculty of Physics and CeNS, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 Munich, Germany
| | - Carla Pernpeintner
- Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstrasse 10, 80539 Munich, Germany
| | - David B Konrad
- Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
| | - James A Frank
- Vollum Institute, Oregon Health & Science University, 3181 S.W. Sam Jackson Park Road, Portland, Oregon 97239, United States
| | - Dirk Trauner
- Department of Chemistry, New York University, Silver Center, 100 Washington Square East, Room 712, New York, New York 10003, United States
- Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
| | - Bert Nickel
- Faculty of Physics and CeNS, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 Munich, Germany
| | - Theobald Lohmueller
- Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstrasse 10, 80539 Munich, Germany
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4
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Abstract
A wide range of cell–microenvironmental interactions are mediated by membrane-localized receptors that bind ligands present on another cell or the extracellular matrix. This situation introduces a number of physical effects including spatial organization of receptor–ligand complexes and development of mechanical forces in cells. Unlike traditional experimental approaches, hybrid live cell–supported lipid bilayer (SLB) systems, wherein a live cell interacts with a synthetic substrate supported membrane, allow interrogation of these aspects of receptor signaling. The SLB system directly offers facile control over the identity, density, and mobility of ligands used for engaging cellular receptors. Further, application of various nano- and micropatterning techniques allows for spatial patterning of ligands. In this review, we describe the hybrid live cell–SLB system and its application in uncovering a range of spatial and mechanical aspects of receptor signaling. We highlight the T cell immunological synapse, junctions formed between EphA2- and ephrinA1-expressing cells, and adhesions formed by cadherin and integrin receptors.
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Affiliation(s)
- Kabir H. Biswas
- NTU Institute for Health Technologies, Nanyang Technological University, Singapore 637553
| | - Jay T. Groves
- Department of Chemistry, University of California, Berkeley, California 94720, USA
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5
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Su SA, Xie Y, Zhang Y, Xi Y, Cheng J, Xiang M. Essential roles of EphrinB2 in mammalian heart: from development to diseases. Cell Commun Signal 2019; 17:29. [PMID: 30909943 PMCID: PMC6434800 DOI: 10.1186/s12964-019-0337-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Accepted: 03/11/2019] [Indexed: 12/11/2022] Open
Abstract
EphrinB2, a membrane-tethered ligand preferentially binding to its receptor EphB4, is ubiquitously expressed in all mammals. Through the particular bidirectional signaling, EphrinB2 plays a critical role during the development of cardiovascular system, postnatal angiogenesis physiologically and pathologically, and cardiac remodeling after injuries as an emerging role. This review highlights the pivotal involvement of EphrinB2 in heart, from developmental cardiogenesis to pathological cardiac remodeling process. Further potential translational therapies will be discussed in targeting EphrinB2 signaling, to better understand the prevention and treatment of cardiovascular diseases.
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Affiliation(s)
- Sheng-An Su
- Department of Cardiology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, 310009, China
| | - Yao Xie
- Department of Cardiology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, 310009, China
| | - Yuhao Zhang
- Department of Cardiology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, 310009, China
| | - Yutao Xi
- Texas Heart Institute, Houston, 77030, USA.
| | - Jie Cheng
- Texas Heart Institute, Houston, 77030, USA
| | - Meixiang Xiang
- Department of Cardiology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, 310009, China.
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6
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Buchegger B, Kreutzer J, Axmann M, Mayr S, Wollhofen R, Plochberger B, Jacak J, Klar TA. Proteins on Supported Lipid Bilayers Diffusing around Proteins Fixed on Acrylate Anchors. Anal Chem 2018; 90:12372-12376. [PMID: 30350628 PMCID: PMC6222595 DOI: 10.1021/acs.analchem.8b02588] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Accepted: 10/16/2018] [Indexed: 01/04/2023]
Abstract
Mobility of proteins and lipids plays a major role in physiological processes. Platforms which were developed to study protein interaction between immobilized and mobile proteins suffer from shortcomings such as fluorescence quenching or complicated fabrication methods. Here we report a versatile platform comprising immobilized histidine-tagged proteins and biotinylated proteins in a mobile phase. Importantly, multiphoton photolithography was used for easy and fast fabrication of the platform and allows, in principle, extension of its application to three dimensions. The platform, which is made up of functionalized polymer structures embedded in a mobile lipid bilayer, shows low background fluorescence and allows for mobility of arbitrary proteins.
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Affiliation(s)
- Bianca Buchegger
- Institute
of Applied Physics, Johannes Kepler University
Linz, Altenberger Straße 69, 4040 Linz, Austria
| | - Johannes Kreutzer
- Institute
of Applied Physics, Johannes Kepler University
Linz, Altenberger Straße 69, 4040 Linz, Austria
| | - Markus Axmann
- Institute
of Medical Chemistry, Center for Pathobiochemistry and Genetics, Medical University of Vienna, Währinger Straße 10, 1090 Vienna, Austria
| | - Sandra Mayr
- School
of Medical Engineering and Applied Social Sciences, University of Applied Sciences Upper Austria, Garnisonstraße 21, 4020 Linz, Austria
| | - Richard Wollhofen
- Institute
of Applied Physics, Johannes Kepler University
Linz, Altenberger Straße 69, 4040 Linz, Austria
| | - Birgit Plochberger
- School
of Medical Engineering and Applied Social Sciences, University of Applied Sciences Upper Austria, Garnisonstraße 21, 4020 Linz, Austria
| | - Jaroslaw Jacak
- Institute
of Applied Physics, Johannes Kepler University
Linz, Altenberger Straße 69, 4040 Linz, Austria
- School
of Medical Engineering and Applied Social Sciences, University of Applied Sciences Upper Austria, Garnisonstraße 21, 4020 Linz, Austria
| | - Thomas A. Klar
- Institute
of Applied Physics, Johannes Kepler University
Linz, Altenberger Straße 69, 4040 Linz, Austria
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7
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Cai H, Muller J, Depoil D, Mayya V, Sheetz MP, Dustin ML, Wind SJ. Full control of ligand positioning reveals spatial thresholds for T cell receptor triggering. NATURE NANOTECHNOLOGY 2018; 13:610-617. [PMID: 29713075 PMCID: PMC6035778 DOI: 10.1038/s41565-018-0113-3] [Citation(s) in RCA: 104] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 03/07/2018] [Indexed: 05/18/2023]
Abstract
Elucidating the rules for receptor triggering in cell-cell and cell-matrix contacts requires precise control of ligand positioning in three dimensions. Here, we use the T cell receptor (TCR) as a model and subject T cells to different geometric arrangements of ligands, using a nanofabricated single-molecule array platform. This comprises monovalent TCR ligands anchored to lithographically patterned nanoparticle clusters surrounded by mobile adhesion molecules on a supported lipid bilayer. The TCR ligand could be co-planar with the supported lipid bilayer (2D), excluding the CD45 transmembrane tyrosine phosphatase, or elevated by 10 nm on solid nanopedestals (3D), allowing closer access of CD45 to engaged TCR. The two configurations resulted in different T cell responses, depending on the lateral spacing between the ligands. These results identify the important contributions of lateral and axial components of ligand positioning and create a more complete foundation for receptor engineering for immunotherapy.
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Affiliation(s)
- Haogang Cai
- Department of Mechanical Engineering, Columbia University, New York, NY, USA
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL, USA
| | - James Muller
- Skirball Institute of Biomolecular Medicine, New York University School of Medicine, New York, NY, USA
| | - David Depoil
- The Kennedy Institute of Rheumatology, Nuffield Department of Orthopedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - Viveka Mayya
- The Kennedy Institute of Rheumatology, Nuffield Department of Orthopedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - Michael P Sheetz
- Mechanobiology Institute of Singapore, National University of Singapore, Singapore, Singapore
- Department of Biological Sciences, Columbia University, New York, NY, USA
| | - Michael L Dustin
- Skirball Institute of Biomolecular Medicine, New York University School of Medicine, New York, NY, USA.
- The Kennedy Institute of Rheumatology, Nuffield Department of Orthopedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK.
| | - Shalom J Wind
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, USA.
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8
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Koçer G, Jonkheijm P. About Chemical Strategies to Fabricate Cell-Instructive Biointerfaces with Static and Dynamic Complexity. Adv Healthc Mater 2018; 7:e1701192. [PMID: 29717821 DOI: 10.1002/adhm.201701192] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2017] [Revised: 02/12/2018] [Indexed: 12/21/2022]
Abstract
Properly functioning cell-instructive biointerfaces are critical for healthy integration of biomedical devices in the body and serve as decisive tools for the advancement of our understanding of fundamental cell biological phenomena. Studies are reviewed that use covalent chemistries to fabricate cell-instructive biointerfaces. These types of biointerfaces typically result in a static presentation of predefined cell-instructive cues. Chemically defined, but dynamic cell-instructive biointerfaces introduce spatiotemporal control over cell-instructive cues and present another type of biointerface, which promises a more biomimetic way to guide cell behavior. Therefore, strategies that offer control over the lateral sorting of ligands, the availability and molecular structure of bioactive ligands, and strategies that offer the ability to induce physical, chemical and mechanical changes in situ are reviewed. Specific attention is paid to state-of-the-art studies on dynamic, cell-instructive 3D materials. Future work is expected to further deepen our understanding of molecular and cellular biological processes investigating cell-type specific responses and the translational steps toward targeted in vivo applications.
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Affiliation(s)
- Gülistan Koçer
- TechMed Centre and MESA Institute for Nanotechnology; University of Twente; 7500 AE Enschede The Netherlands
- Institute of Biomaterials and Biomedical Engineering; University of Toronto; Toronto M5S 3G9 Ontario Canada
| | - Pascal Jonkheijm
- TechMed Centre and MESA Institute for Nanotechnology; University of Twente; 7500 AE Enschede The Netherlands
- Institute of Biomaterials and Biomedical Engineering; University of Toronto; Toronto M5S 3G9 Ontario Canada
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9
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Tunable cell-surface mimetics as engineered cell substrates. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:2076-2093. [PMID: 29935145 DOI: 10.1016/j.bbamem.2018.06.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 05/18/2018] [Accepted: 06/08/2018] [Indexed: 12/21/2022]
Abstract
Most recent breakthroughs in understanding cell adhesion, cell migration, and cellular mechanosensitivity have been made possible by the development of engineered cell substrates of well-defined surface properties. Traditionally, these substrates mimic the extracellular matrix (ECM) environment by the use of ligand-functionalized polymeric gels of adjustable stiffness. However, such ECM mimetics are limited in their ability to replicate the rich dynamics found at cell-cell contacts. This review focuses on the application of cell surface mimetics, which are better suited for the analysis of cell adhesion, cell migration, and cellular mechanosensitivity across cell-cell interfaces. Functionalized supported lipid bilayer systems were first introduced as biomembrane-mimicking substrates to study processes of adhesion maturation during adhesion of functionalized vesicles (cell-free assay) and plated cells. However, while able to capture adhesion processes, the fluid lipid bilayer of such a relatively simple planar model membrane prevents adhering cells from transducing contractile forces to the underlying solid, making studies of cell migration and cellular mechanosensitivity largely impractical. Therefore, the main focus of this review is on polymer-tethered lipid bilayer architectures as biomembrane-mimicking cell substrate. Unlike supported lipid bilayers, these polymer-lipid composite materials enable the free assembly of linkers into linker clusters at cellular contacts without hindering cell spreading and migration and allow the controlled regulation of mechanical properties, enabling studies of cellular mechanosensitivity. The various polymer-tethered lipid bilayer architectures and their complementary properties as cell substrates are discussed.
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10
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Cai H, Depoil D, Muller J, Sheetz MP, Dustin ML, Wind SJ. Spatial Control of Biological Ligands on Surfaces Applied to T Cell Activation. Methods Mol Biol 2018; 1584:307-331. [PMID: 28255709 DOI: 10.1007/978-1-4939-6881-7_18] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
In this chapter, we present techniques, based on molecular-scale nanofabrication and selective self-assembly, for the presentation of biomolecules of interest (ligands, receptors, etc.) on a surface with precise spatial control and arbitrary geometry at the single-molecule level. Metallic nanodot arrays are created on glass coverslips and are then used as anchors for the immobilization of biological ligands via thiol linking chemistry. The nanodot size is controlled by both lithography and metallization. The reagent concentration in self-assembly can be adjusted to ensure single-molecule occupancy for a given dot size. The surrounding glass is backfilled by a protein-repellent layer to prevent nonspecific adsorption. Moreover, bifunctional surfaces are created, whereby a second ligand is presented on the background, which is frequently a requirement for simulating complex cellular functions involving more than one key ligand. This platform serves as a novel and powerful tool for molecular and cellular biology, e.g., to study the fundamental mechanisms of receptor-mediated signaling.
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Affiliation(s)
- Haogang Cai
- Department of Mechanical Engineering, Columbia University, New York, USA
| | - David Depoil
- Kennedy Institute of Rheumatology, NDORMS, The University of Oxford, Oxford, UK
| | - James Muller
- Department of Pathology, Skirball Institute, New York University School of Medicine, New York, USA
| | - Michael P Sheetz
- Department of Biological Sciences, Columbia University, New York, USA.,National University of Singapore, Singapore, Singapore
| | - Michael L Dustin
- Kennedy Institute of Rheumatology, NDORMS, The University of Oxford, Oxford, UK.,Department of Pathology, Skirball Institute, New York University School of Medicine, New York, USA
| | - Shalom J Wind
- Department of Applied Physics and Applied Mathematics, Columbia University, 500 W 120th St, New York, NY, 10027, USA.
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11
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Glazier R, Salaita K. Supported lipid bilayer platforms to probe cell mechanobiology. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2017; 1859:1465-1482. [PMID: 28502789 PMCID: PMC5531615 DOI: 10.1016/j.bbamem.2017.05.005] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 05/09/2017] [Accepted: 05/09/2017] [Indexed: 12/15/2022]
Abstract
Mammalian and bacterial cells sense and exert mechanical forces through the process of mechanotransduction, which interconverts biochemical and physical signals. This is especially important in contact-dependent signaling, where ligand-receptor binding occurs at cell-cell or cell-ECM junctions. By virtue of occurring within these specialized junctions, receptors engaged in contact-dependent signaling undergo oligomerization and coupling with the cytoskeleton as part of their signaling mechanisms. While our ability to measure and map biochemical signaling within cell junctions has advanced over the past decades, physical cues remain difficult to map in space and time. Recently, supported lipid bilayer (SLB) technologies have emerged as a flexible platform to mimic and perturb cell-cell and cell-ECM junctions, allowing one to study membrane receptor mechanotransduction. Changing the lipid composition and underlying substrate tunes bilayer fluidity, and lipid and ligand micro- and nano-patterning spatially control positioning and clustering of receptors. Patterning metal gridlines within SLBs confines lipid mobility and introduces mechanical resistance. Here we review fundamental SLB mechanics and how SLBs can be engineered as tunable cell substrates for mechanotransduction studies. Finally, we highlight the impact of this work in understanding the biophysical mechanisms of cell adhesion. This article is part of a Special Issue entitled: Interactions between membrane receptors in cellular membranes edited by Kalina Hristova.
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Affiliation(s)
- Roxanne Glazier
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, and Emory University, Atlanta, GA 30322, United States
| | - Khalid Salaita
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, and Emory University, Atlanta, GA 30322, United States; Department of Chemistry, Emory University, Atlanta, GA 30322, United States..
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12
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Blachon F, Harb F, Munteanu B, Piednoir A, Fulcrand R, Charitat T, Fragneto G, Pierre-Louis O, Tinland B, Rieu JP. Nanoroughness Strongly Impacts Lipid Mobility in Supported Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:2444-2453. [PMID: 28219008 DOI: 10.1021/acs.langmuir.6b03276] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In vivo lipid membranes interact with rough supramolecular structures such as protein clusters and fibrils. How these features whose size ranges from a few nanometers to a few tens of nanometers impact lipid and protein mobility is still being investigated. Here, we study supported phospholipid bilayers, a unique biomimetic model, deposited on etched surfaces bearing nanometric corrugations. The surface roughness and mean curvature are carefully characterized by AFM imaging using ultrasharp tips. Neutron specular reflectivity supplements this surface characterization and indicates that the bilayers follow the large-scale corrugations of the substrate. We measure the lateral mobility of lipids in both the fluid and gel phases by fluorescence recovery after patterned photobleaching. Although the mobility is independent of the roughness in the gel phase, it exhibits a 5-fold decrease in the fluid phase when the roughness increases from 0.2 to 10 nm. These results are interpreted with a two-phase model allowing for a strong decrease in the lipid mobility in highly curved or defect-induced gel-like nanoscale regions. This suggests a strong link between membrane curvature and fluidity, which is a key property for various cell functions such as signaling and adhesion.
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Affiliation(s)
- Florence Blachon
- Université Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
| | - Frédéric Harb
- Doctoral School for Science and Technology, Platform for Research in NanoSciences and Nanotechnology, Campus Pierre Gemayel, Lebanese University , Fanar-Metn BP 90239 Beirut, Lebanon
| | - Bogdan Munteanu
- CNRS, INSA de Lyon, LaMCoS, UMR5259, Université de Lyon , 69621 Lyon, France
| | - Agnès Piednoir
- Université Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
| | - Rémy Fulcrand
- Université Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
| | - Thierry Charitat
- Université de Strasbourg, Institut Charles Sadron , UPR22, CNRS, 67034 Strasbourg Cedex 2, France
| | - Giovanna Fragneto
- Institut Laue-Langevin , 71 Avenue des Martyrs, F-38042 Grenoble, France
| | - Olivier Pierre-Louis
- Université Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
| | - Bernard Tinland
- CINaM-CNRS, Aix-Marseille Université , UMR7325, 13288 Marseille, France
| | - Jean-Paul Rieu
- Université Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
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13
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Sayin M, Dahint R. Formation of charge-nanopatterned templates with flexible geometry via layer by layer deposition of polyelectrolytes for directed self-assembly of gold nanoparticles. NANOTECHNOLOGY 2017; 28:135303. [PMID: 28167811 DOI: 10.1088/1361-6528/aa5ec3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Nanostructure formation via self-assembly processes offers a fast and cost-effective approach to generate surface patterns on large lateral scale. In particular, if the high precision of lithographic techniques is not required, a situation typical of many biotechnological and biomedical applications, it may be considered as the method of choice as it does not require any sophisticated instrumentation. However, in many cases the variety and complexity of the surface structures accessible with a single self-assembly based technique is limited. Here, we report on a new approach which combines two different self-assembly strategies, colloidal lithography and layer-by-layer deposition of polyelectrolytes, in order to significantly expand the spectrum of accessible patterns. In particular, flat and donut-like charge-patterned templates have been generated, which facilitate subsequent deposition of gold nanoparticles in dot, grid, ring, out-of-ring and circular patch structures. Potential applications are e.g. in the fields of biofunctional interfaces with well-defined lateral dimensions, optical devices with tuned properties, and controlled three-dimensional material growth.
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Affiliation(s)
- Mustafa Sayin
- Applied Physical Chemistry, Heidelberg University, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany
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14
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Delcassian D, Sattler S, Dunlop IE. T cell immunoengineering with advanced biomaterials. Integr Biol (Camb) 2017; 9:211-222. [PMID: 28252135 PMCID: PMC6034443 DOI: 10.1039/c6ib00233a] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2016] [Accepted: 02/15/2017] [Indexed: 12/25/2022]
Abstract
Recent advances in biomaterials design offer the potential to actively control immune cell activation and behaviour. Many human diseases, such as infections, cancer, and autoimmune disorders, are partly mediated by inappropriate or insufficient activation of the immune system. T cells play a central role in the host immune response to these diseases, and so constitute a promising cell type for manipulation. In vivo, T cells are stimulated by antigen presenting cells (APC), therefore to design immunoengineering biomaterials that control T cell behaviour, artificial interfaces that mimic the natural APC-T cell interaction are required. This review draws together research in the design and fabrication of such biomaterial interfaces, and highlights efforts to elucidate key parameters in T cell activation, such as substrate mechanical properties and spatial organization of receptors, illustrating how they can be manipulated by bioengineering approaches to alter T cell function.
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Affiliation(s)
- Derfogail Delcassian
- School of Pharmacy, University of Nottingham, NG7 2RD, UK. and Koch Institute for Integrative Cancer Research, MIT, Massachusetts, 02139, USA
| | - Susanne Sattler
- Imperial College London National Heart and Lung Institute, Du Cane Road, W12 0NN, London, UK
| | - Iain E Dunlop
- Department of Materials, Imperial College London, SW7 2AZ, UK.
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15
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Koçer G, Jonkheijm P. Guiding hMSC Adhesion and Differentiation on Supported Lipid Bilayers. Adv Healthc Mater 2017; 6. [PMID: 27893196 DOI: 10.1002/adhm.201600862] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 10/25/2016] [Indexed: 11/11/2022]
Abstract
Mesenchymal stem cells (MSCs) are intensively investigated for regenerative medicine applications due to their ease of isolation and multilineage differentiation capacity. Hence, designing instructive microenvironments to guide MSC behavior is important for the generation of smart interfaces to enhance biomaterial performance in guiding desired tissue formation. Supported lipid bilayers (SLBs) as cell membrane mimetics can be employed as biological interfaces with easily tunable characteristics such as biospecificity, mobility, and density of predesigned ligand molecules. Arg-Gly-Asp (RGD) ligand functionalized SLBs are explored for guiding human MSC (hMSC) adhesion and differentiation by studying the effect of changes in ligand density and mobility. Cellular and molecular analyses show that adhesion occurs through specific interactions with RGD ligands where the extent is positively correlated to changes in ligand density. Furthermore, cell area is significantly regulated by ligand density on ligand-mobile SLBs when compared to ligand-immobile SLBs. Finally, the osteogenic differentiation capacity of hMSCs is positively correlated to ligand density on ligand-mobile SLBs indicating that regulation of cell spreading is linked to cell differentiation capacity. These results demonstrate that hMSC behavior can be directed on SLBs by molecular design and presents SLBs as versatile platforms for future engineering of smart biomaterial coatings.
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Affiliation(s)
- Gülistan Koçer
- Bioinspired Molecular Engineering Laboratory; MIRA Institute for Biomedical Technology; Technical Medicine and Molecular Nanofabrication Group; MESA+ Institute for Nanotechnology; University of Twente; 7500 AE Enschede The Netherlands
| | - Pascal Jonkheijm
- Bioinspired Molecular Engineering Laboratory; MIRA Institute for Biomedical Technology; Technical Medicine and Molecular Nanofabrication Group; MESA+ Institute for Nanotechnology; University of Twente; 7500 AE Enschede The Netherlands
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16
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17
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Li W, Chung JK, Lee YK, Groves JT. Graphene-Templated Supported Lipid Bilayer Nanochannels. NANO LETTERS 2016; 16:5022-6. [PMID: 27362914 DOI: 10.1021/acs.nanolett.6b01798] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The use of patterned substrates to impose geometrical restriction on the lateral mobility of molecules in supported lipid membranes has found widespread utility in studies of cell membranes. Here, we template-pattern supported lipid membranes with nanopatterned graphene. We utilize focused ion beam milling to pattern graphene on its growth substrate, then transfer the patterned graphene to fresh glass substrates for subsequent supported membrane formation. We observe that graphene functions as an excellent lateral diffusion barrier for supported lipid bilayers. Additionally, the observed diffusion dynamics of lipids in nanoscale graphene channels reveal extremely low boundary effects, a common problem with other materials. We suggest this is attributable to the ultimate thinness of graphene.
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Affiliation(s)
- Wan Li
- Department of Chemistry, University of California , Berkeley, California 94720, United States
| | - Jean K Chung
- Department of Chemistry, University of California , Berkeley, California 94720, United States
| | - Young Kwang Lee
- Department of Chemistry, University of California , Berkeley, California 94720, United States
| | - Jay T Groves
- Department of Chemistry, University of California , Berkeley, California 94720, United States
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18
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Cai H, Wolfenson H, Depoil D, Dustin ML, Sheetz MP, Wind SJ. Molecular Occupancy of Nanodot Arrays. ACS NANO 2016; 10:4173-83. [PMID: 26966946 PMCID: PMC5337305 DOI: 10.1021/acsnano.5b07425] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Single-molecule nanodot arrays, in which a biomolecule of choice (protein, nucleic acid, etc.) is bound to a metallic nanoparticle on a solid substrate, are becoming an increasingly important tool in the study of biomolecular and cellular interactions. We have developed an on-chip measurement protocol to monitor and control the molecular occupancy of nanodots. Arrays of widely spaced nanodots and nanodot clusters were fabricated on glass surfaces by nanolithography and functionalized with fluorescently labeled proteins. The molecular occupancy was determined by monitoring individual fluorophore bleaching events, while accounting for fluorescence quenching effects. We found that the occupancy can be interpreted as a packing problem, and depends on nanodot size and binding ligand concentration, where the latter is easily adjusted to compensate the flexibility of dimension control in nanofabrication. The results are scalable with nanodot cluster size, extending to large area close packed arrays. As an example, the nanoarray platform was used to probe the geometric requirement of T-cell activation at the single-molecule level.
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Affiliation(s)
- Haogang Cai
- Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States
| | - Haguy Wolfenson
- Department of Biological Sciences, Columbia University, New York, New York 10027, United States
| | - David Depoil
- The Kennedy Institute of Rheumatology, University of Oxford, Oxford, OX3 7FY, United Kingdom
| | - Michael L. Dustin
- The Kennedy Institute of Rheumatology, University of Oxford, Oxford, OX3 7FY, United Kingdom
| | - Michael P. Sheetz
- Department of Biological Sciences, Columbia University, New York, New York 10027, United States
| | - Shalom J. Wind
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States
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19
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Li MY, Sui M, Pandey P, Zhang QZ, Kunwar S, Salamo GJ, Lee J. Precise control of configuration, size and density of self-assembled Au nanostructures on 4H-SiC (0001) by systematic variation of deposition amount, annealing temperature and duration. CrystEngComm 2016. [DOI: 10.1039/c5ce02439k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hexagonal Au nano-crystals, round dome-shaped droplets and irregular nano-mounds were fabricated on GaN (0001) based on the combinational effects of thermal dewetting and surface free energy minimization.
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Affiliation(s)
- Ming-Yu Li
- College of Electronics and Information
- Kwangwoon University
- Nowon-gu, South Korea
| | - Mao Sui
- College of Electronics and Information
- Kwangwoon University
- Nowon-gu, South Korea
| | - Puran Pandey
- College of Electronics and Information
- Kwangwoon University
- Nowon-gu, South Korea
| | - Quan-zhen Zhang
- College of Electronics and Information
- Kwangwoon University
- Nowon-gu, South Korea
| | - Sundar Kunwar
- College of Electronics and Information
- Kwangwoon University
- Nowon-gu, South Korea
| | - Gregory. J. Salamo
- Institute of Nanoscale Science and Engineering
- University of Arkansas
- Fayetteville, USA
| | - Jihoon Lee
- College of Electronics and Information
- Kwangwoon University
- Nowon-gu, South Korea
- Institute of Nanoscale Science and Engineering
- University of Arkansas
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20
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van Weerd J, Karperien M, Jonkheijm P. Supported Lipid Bilayers for the Generation of Dynamic Cell-Material Interfaces. Adv Healthc Mater 2015; 4:2743-79. [PMID: 26573989 DOI: 10.1002/adhm.201500398] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Revised: 08/03/2015] [Indexed: 12/13/2022]
Abstract
Supported lipid bilayers (SLB) offer unique possibilities for studying cellular membranes and have been used as a synthetic architecture to interact with cells. Here, the state-of-the-art in SLB-based technology is presented. The fabrication, analysis, characteristics and modification of SLBs are described in great detail. Numerous strategies to form SLBs on different substrates, and the means to patteren them, are described. The use of SLBs as model membranes for the study of membrane organization and membrane processes in vitro is highlighted. In addition, the use of SLBs as a substratum for cell analysis is presented, with discrimination between cell-cell and cell-extracellular matrix (ECM) mimicry. The study is concluded with a discussion of the potential for in vivo applications of SLBs.
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Affiliation(s)
- Jasper van Weerd
- Bioinspired Molecular Engineering; University of Twente; PO Box 217 7500 AE Enschede The Netherlands
- Dept. of Developmental BioEngineering; MIRA Institute for Biomedical Technology and Technical Medicine; University of Twente; PO Box 217 7500 AE Enschede The Netherlands
- Molecular Nanofabrication Group, MESA+; University of Twente; Enschede 7500 AE The Netherlands
| | - Marcel Karperien
- Dept. of Developmental BioEngineering; MIRA Institute for Biomedical Technology and Technical Medicine; University of Twente; PO Box 217 7500 AE Enschede The Netherlands
| | - Pascal Jonkheijm
- Bioinspired Molecular Engineering; University of Twente; PO Box 217 7500 AE Enschede The Netherlands
- Molecular Nanofabrication Group, MESA+; University of Twente; Enschede 7500 AE The Netherlands
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21
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Abstract
INTRODUCTION The past decade has witnessed tremendous progress in surface micropatterning techniques for generating arrays of various types of biomolecules. Multiplexed protein micropatterning has tremendous potential for drug discovery providing versatile means for high throughput assays required for target and lead identification as well as diagnostics and functional screening for personalized medicine. However, ensuring the functional integrity of proteins on surfaces has remained challenging, in particular in the case of membrane proteins, the most important class of drug targets. Yet, generic strategies to control functional organization of proteins into micropatterns are emerging. AREAS COVERED This review includes an overview introducing the most common approaches for surface modification and functional protein immobilization. The authors present the key photo and soft lithography techniques with respect to compatibility with functional protein micropatterning and multiplexing capabilities. In the second part, the authors present the key applications of protein micropatterning techniques in drug discovery with a focus on membrane protein interactions and cellular signaling. EXPERT OPINION With the growing importance of target discovery as well as protein-based therapeutics and personalized medicine, the application of protein arrays can play a fundamental role in drug discovery. Yet, important technical breakthroughs are still required for broad application of these approaches, which will include in vitro "copying" of proteins from cDNA arrays into micropatterns, direct protein capturing from single cells as well as protein microarrays in living cells.
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Affiliation(s)
- Changjiang You
- a Department of Biology, Division of Biophysics , University of Osnabrück , Osnabrück 49076 , Germany
| | - Jacob Piehler
- a Department of Biology, Division of Biophysics , University of Osnabrück , Osnabrück 49076 , Germany
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22
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Zhang L, Christensen SM, Bendix PM, Bhatia VK, Loft S, Stamou D. Interferometric Detection of Single Gold Nanoparticles Calibrated against TEM Size Distributions. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:3550-3555. [PMID: 25824101 DOI: 10.1002/smll.201403498] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Revised: 03/02/2015] [Indexed: 06/04/2023]
Abstract
Single nanoparticle analysis: An interferometric optical approach calibrates sizes of gold nanoparticles (AuNPs) from the interference intensities by calibrating their interferometric signals against the corresponding transmission electron microscopy measurements. This method is used to investigate whether size affects the diffusion behavior of AuNPs conjugated to supported lipid bilayer membranes and to multiplex the simultaneous detection of three different AuNP labels.
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Affiliation(s)
- Lixue Zhang
- Bio-Nanotechnology Laboratory, Department of Chemistry Nano-Science Center, Lundbeck Foundation Center Biomembranes in Nanomedicine, University of Copenhagen, 2100, Copenhagen, Denmark
| | - Sune M Christensen
- Bio-Nanotechnology Laboratory, Department of Chemistry Nano-Science Center, Lundbeck Foundation Center Biomembranes in Nanomedicine, University of Copenhagen, 2100, Copenhagen, Denmark
| | - Poul Martin Bendix
- Bio-Nanotechnology Laboratory, Department of Chemistry Nano-Science Center, Lundbeck Foundation Center Biomembranes in Nanomedicine, University of Copenhagen, 2100, Copenhagen, Denmark
| | - Vikram Kjøller Bhatia
- Bio-Nanotechnology Laboratory, Department of Chemistry Nano-Science Center, Lundbeck Foundation Center Biomembranes in Nanomedicine, University of Copenhagen, 2100, Copenhagen, Denmark
| | - Steffen Loft
- Institute of Public Health Department of Environmental Health, University of Copenhagen, 2100, Copenhagen, Denmark
| | - Dimitrios Stamou
- Bio-Nanotechnology Laboratory, Department of Chemistry Nano-Science Center, Lundbeck Foundation Center Biomembranes in Nanomedicine, University of Copenhagen, 2100, Copenhagen, Denmark
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23
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Abstract
The current study deals with the self-assembly of phospholipids on flat supports using the Martini coarse grain model.
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Affiliation(s)
- Anil R. Mhashal
- Physical Chemistry Division
- National Chemical Laboratory
- Pune
- India
| | - Sudip Roy
- Physical Chemistry Division
- National Chemical Laboratory
- Pune
- India
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24
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Oh Y, Son T, Kim SY, Lee W, Yang H, Choi JR, Shin JS, Kim D. Surface plasmon-enhanced nanoscopy of intracellular cytoskeletal actin filaments using random nanodot arrays. OPTICS EXPRESS 2014; 22:27695-27706. [PMID: 25401913 DOI: 10.1364/oe.22.027695] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The feasibility of super-resolution microscopy has been investigated based on random localization of surface plasmon using blocked random nanodot arrays. The resolution is mainly determined by the size of localized fields in the range of 100-150 nm. The concept was validated by imaging FITC-conjugated phalloidin that binds to cellular actin filaments. The experimental results confirm improved resolution in reconstructed images. Effect of far-field registration on image reconstruction was also analyzed. Correlation between reconstructed images was maintained to be above 81% after registration. Nanodot arrays are synthesized by temperature-annealing without sophisticated lithography and thus can be mass-produced in an extremely large substrate. The results suggest a super-resolution imaging technique that can be accessible and available in large amounts.
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25
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Abstract
The erythropoietin-producing hepatocellular carcinoma (Eph) receptor tyrosine kinase family plays important roles in developmental processes, adult tissue homeostasis, and various diseases. Interaction with Eph receptor-interacting protein (ephrin) ligands on the surface of neighboring cells triggers Eph receptor kinase-dependent signaling. The ephrins can also transmit signals, leading to bidirectional cell contact-dependent communication. Moreover, Eph receptors and ephrins can function independently of each other through interplay with other signaling systems. Given their involvement in many pathological conditions ranging from neurological disorders to cancer and viral infections, Eph receptors and ephrins are increasingly recognized as attractive therapeutic targets, and various strategies are being explored to modulate their expression and function. Eph receptor/ephrin upregulation in cancer cells, the angiogenic vasculature, and injured or diseased tissues also offer opportunities for Eph/ephrin-based targeted drug delivery and imaging. Thus, despite the challenges presented by the complex biology of the Eph receptor/ephrin system, exciting possibilities exist for therapies exploiting these molecules.
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Affiliation(s)
- Antonio Barquilla
- Cancer Center, Sanford-Burnham Medical Research Institute, La Jolla, California 92037; ,
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26
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Spatial control of membrane receptor function using ligand nanocalipers. Nat Methods 2014; 11:841-6. [DOI: 10.1038/nmeth.3025] [Citation(s) in RCA: 181] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Accepted: 05/20/2014] [Indexed: 12/20/2022]
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27
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Basit H, Lopez SG, Keyes TE. Fluorescence correlation and lifetime correlation spectroscopy applied to the study of supported lipid bilayer models of the cell membrane. Methods 2014; 68:286-99. [DOI: 10.1016/j.ymeth.2014.02.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Revised: 01/21/2014] [Accepted: 02/06/2014] [Indexed: 10/25/2022] Open
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28
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Caculitan N, Kai H, Liu EY, Fay N, Yu Y, Lohmüller T, O’Donoghue G, Groves JT. Size-based chromatography of signaling clusters in a living cell membrane. NANO LETTERS 2014; 14:2293-8. [PMID: 24655064 PMCID: PMC4025576 DOI: 10.1021/nl404514e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Revised: 03/13/2014] [Indexed: 05/05/2023]
Abstract
Here we introduce a form of chromatography that can be imposed on the membrane of a living cell. A cell-cell signaling interaction is reconstituted in a hybrid live cell-supported membrane junction. The chromatographic material consists of a hexagonally ordered array of gold nanoparticles (nanodot array), which is fabricated onto the underlying substrate. While individual membrane components move freely throughout the array, the movement of larger assemblies is impeded if they exceed the physical dimensions of the array. This tactile approach to probing membrane structures in living cells reveals organizational aspects of the membrane environment unobservable by other techniques.
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Affiliation(s)
- Niña
G. Caculitan
- Howard
Hughes Medical Institute, Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Hiroyuki Kai
- Howard
Hughes Medical Institute, Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Eulanca Y. Liu
- Howard
Hughes Medical Institute, Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Nicole Fay
- Howard
Hughes Medical Institute, Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Yan Yu
- Howard
Hughes Medical Institute, Department of Chemistry, University of California, Berkeley, California 94720, United States
- Physical
Biosciences and Materials Sciences Divisions, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Theobald Lohmüller
- Howard
Hughes Medical Institute, Department of Chemistry, University of California, Berkeley, California 94720, United States
- Physical
Biosciences and Materials Sciences Divisions, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Geoff
P. O’Donoghue
- Howard
Hughes Medical Institute, Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Jay T. Groves
- Howard
Hughes Medical Institute, Department of Chemistry, University of California, Berkeley, California 94720, United States
- Physical
Biosciences and Materials Sciences Divisions, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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29
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Wang X, Berger R, Ramos JI, Wang T, Koynov K, Liu G, Butt HJ, Wu S. Nanopatterns of polymer brushes for understanding protein adsorption on the nanoscale. RSC Adv 2014. [DOI: 10.1039/c4ra07623k] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Nanopatterns of polymer brushes enable us to directly image protein adsorption/desorption processes on the polymer brushes by atomic force microscopy (AFM).
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Affiliation(s)
- Xiaowen Wang
- Max Planck Institute for Polymer Research
- 55128 Mainz, Germany
- Hefei National Laboratory for Physical Sciences at the Microscale
- Department of Chemical Physics
- University of Science and Technology of China
| | - Rüdiger Berger
- Max Planck Institute for Polymer Research
- 55128 Mainz, Germany
| | | | - Tao Wang
- Hefei National Laboratory for Physical Sciences at the Microscale
- Department of Chemical Physics
- University of Science and Technology of China
- Hefei 230026, P. R. China
| | - Kaloian Koynov
- Max Planck Institute for Polymer Research
- 55128 Mainz, Germany
| | - Guangming Liu
- Hefei National Laboratory for Physical Sciences at the Microscale
- Department of Chemical Physics
- University of Science and Technology of China
- Hefei 230026, P. R. China
| | | | - Si Wu
- Max Planck Institute for Polymer Research
- 55128 Mainz, Germany
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30
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Lohmüller T, Xu Q, Groves JT. Nanoscale obstacle arrays frustrate transport of EphA2-Ephrin-A1 clusters in cancer cell lines. NANO LETTERS 2013; 13:3059-64. [PMID: 23668885 PMCID: PMC4007685 DOI: 10.1021/nl400874v] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Juxtacrine signaling interactions between the EphA2 receptor tyrosine kinase and its ephrin-A1 ligand contribute to healthy tissue maintenance and misregulation of this system is observed in at least 40% of human breast cancer. Hybrid live cell-supported membrane experiments in which membrane-linked ephrin-A1 displayed in supported membranes interacts with EphA2 in living cells have revealed large scale clustering of EphA2/ephrin-A1 complexes as well as their lateral transport across the cell surface during triggering. Here, we utilize 100 nm spaced hexagonally ordered arrays of gold nanodots embedded within supported membranes to present defined obstacles to the movement and assembly of EphA2 clusters. By functionalizing both the supported membrane and the nanodots with ephrin-A1, we perform a type of affinity chromatography on EphA2 signaling clusters in live cell membranes. Analysis of 10 different breast cancer cell lines reveals that EphA2 transport is most frustrated by nanodot arrays in the most diseased cell lines. These observations suggest that strong physical association among EphA2 receptors, as well as their assembly into larger clusters, correlates with and may contribute to the pathological misregulation of the EphA2/ephrin-A1 pathway in breast cancer.
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Affiliation(s)
- Theobald Lohmüller
- Department of Chemistry, Howard Hughes Medical Institute, University of California, Berkeley, California 94720
- Physical Biosciences and Materials Sciences Divisions, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Qian Xu
- Biophysics Graduate Group, University of California, Berkeley, California 94720
- Physical Biosciences and Materials Sciences Divisions, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Jay T. Groves
- Department of Chemistry, Howard Hughes Medical Institute, University of California, Berkeley, California 94720
- Biophysics Graduate Group, University of California, Berkeley, California 94720
- Physical Biosciences and Materials Sciences Divisions, Lawrence Berkeley National Laboratory, Berkeley, California 94720
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31
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Pi F, Dillard P, Limozin L, Charrier A, Sengupta K. Nanometric protein-patch arrays on glass and polydimethylsiloxane for cell adhesion studies. NANO LETTERS 2013; 13:3372-8. [PMID: 23808889 DOI: 10.1021/nl401696m] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
We present a simple cost-effective benchtop protocol to functionalize glass and polydimethylsiloxane (PDMS) with nanometric protein patches for cell adhesion studies. Evaporation masks, covering macroscopic areas on glass, were made using improved strategies for self-assembly of colloidal microbeads which then served as templates for creating the protein patch arrays via the intermediate steps of organo-aminosilane deposition and polyethylene-glycol grafting. The diameter of the patches could be varied down to about 80 nm. The glass substrates were used for advanced optical imaging of T-lymphocytes to explore adhesion by reflection interference contrast microscopy and the possible colocalization of T-cell receptor microclusters and the activating protein patches by total internal reflection fluorescence microscopy. The selectively functionalized glass could also serve as template for transferring the protein nanopatches to the surface of a soft elastomer. We demonstrated successful reverse contact printing onto the surface of thin layers of PDMS with stiffness ranging from 30 KPa to 3 MPa.
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Affiliation(s)
- Fuwei Pi
- Aix-Marseille Université , CNRS, CINaM UMR 7325, 13288 Marseille, France
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32
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Stender AS, Marchuk K, Liu C, Sander S, Meyer MW, Smith EA, Neupane B, Wang G, Li J, Cheng JX, Huang B, Fang N. Single cell optical imaging and spectroscopy. Chem Rev 2013; 113:2469-527. [PMID: 23410134 PMCID: PMC3624028 DOI: 10.1021/cr300336e] [Citation(s) in RCA: 166] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Anthony S. Stender
- Department of Chemistry, Iowa State University and Ames Laboratory, U. S. Department of Energy, Ames, IA 50011, USA
| | - Kyle Marchuk
- Department of Chemistry, Iowa State University and Ames Laboratory, U. S. Department of Energy, Ames, IA 50011, USA
| | - Chang Liu
- Department of Chemistry, Iowa State University and Ames Laboratory, U. S. Department of Energy, Ames, IA 50011, USA
| | - Suzanne Sander
- Department of Chemistry, Iowa State University and Ames Laboratory, U. S. Department of Energy, Ames, IA 50011, USA
| | - Matthew W. Meyer
- Department of Chemistry, Iowa State University and Ames Laboratory, U. S. Department of Energy, Ames, IA 50011, USA
| | - Emily A. Smith
- Department of Chemistry, Iowa State University and Ames Laboratory, U. S. Department of Energy, Ames, IA 50011, USA
| | - Bhanu Neupane
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695, USA
| | - Gufeng Wang
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695, USA
| | - Junjie Li
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907
| | - Ji-Xin Cheng
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907
| | - Bo Huang
- Department of Pharmaceutical Chemistry and Department of Biochemistry and Biophysics, University of California, San Francisco, CA 94158
| | - Ning Fang
- Department of Chemistry, Iowa State University and Ames Laboratory, U. S. Department of Energy, Ames, IA 50011, USA
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Abstract
It is increasingly recognized that cell signaling, as a chemical process, must be considered at the local, micrometer scale. Micro- and nanofabrication techniques provide access to these dimensions, with the potential to capture and manipulate the spatial complexity of intracellular signaling in experimental models. This review focuses on recent advances in adapting surface engineering for use with biomolecular systems that interface with cell signaling, particularly with respect to surfaces that interact with multiple receptor systems on individual cells. The utility of this conceptual and experimental approach is demonstrated in the context of epithelial cells and T lymphocytes, two systems whose ability to perform their physiological function is dramatically impacted by the convergence and balance of multiple signaling pathways.
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Affiliation(s)
- L.C. Kam
- Deparment of Biomedical Engineering, Columbia University, New York, NY 10027
| | - K. Shen
- Center for Engineering in Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114;
| | - M.L. Dustin
- Molecular Pathogenesis Program, Skirball Institute of Biomolecular Medicine, New York University School of Medicine, New York, NY 10016;
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Dahlin AB, Wittenberg NJ, Höök F, Oh SH. Promises and Challenges of Nanoplasmonic Devices for Refractometric Biosensing. NANOPHOTONICS 2013; 2:83-101. [PMID: 24159429 PMCID: PMC3804425 DOI: 10.1515/nanoph-2012-0026] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Optical biosensors based on surface plasmon resonance (SPR) in metallic thin films are currently standard tools for measuring molecular binding kinetics and affinities - an important task for biophysical studies and pharmaceutical development. Motivated by recent progress in the design and fabrication of metallic nanostructures, such as nanoparticles or nanoholes of various shapes, researchers have been pursuing a new generation of biosensors harnessing tailored plasmonic effects in these engineered nanostructures. Nanoplasmonic devices, while demanding nanofabrication, offer tunability with respect to sensor dimension and physical properties, thereby enabling novel biological interfacing opportunities and extreme miniaturization. Here we provide an integrated overview of refractometric biosensing with nanoplasmonic devices and highlight some recent examples of nanoplasmonic sensors capable of unique functions that are difficult to accomplish with conventional SPR. For example, since the local field strength and spatial distribution can be readily tuned by varying the shape and arrangement of nanostructures, biomolecular interactions can be controlled to occur in regions of high field strength. This may improve signal-to-noise and also enable sensing a small number of molecules. Furthermore, the nanoscale plasmonic sensor elements may, in combination with nanofabrication and materials-selective surface-modifications, make it possible to merge affinity biosensing with nanofluidic liquid handling.
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Affiliation(s)
- Andreas B. Dahlin
- Chalmers University of Technology, Division of Bionanophotonics, Department of Applied Physics, Fysikgränd 3, 41296, Göteborg, Sweden
| | - Nathan J. Wittenberg
- Department of Electrical and Computer Engineering, Laboratory of Nanostructures and Biosensing, University of Minnesota, Twin Cities, 200 Union St. S.E., Minneapolis, MN 55455, U.S.A
| | - Fredrik Höök
- Chalmers University of Technology, Division of Bionanophotonics, Department of Applied Physics, Fysikgränd 3, 41296, Göteborg, Sweden
| | - Sang-Hyun Oh
- Department of Electrical and Computer Engineering, Laboratory of Nanostructures and Biosensing, University of Minnesota, Twin Cities, 200 Union St. S.E., Minneapolis, MN 55455, U.S.A
- Department of Biophysics and Chemical Biology, Seoul National University, Seoul 151-747, Korea
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35
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Wiesbauer M, Wollhofen R, Vasic B, Schilcher K, Jacak J, Klar TA. Nano-anchors with single protein capacity produced with STED lithography. NANO LETTERS 2013; 13:5672-8. [PMID: 24111646 DOI: 10.1021/nl4033523] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Acrylate nanoanchors of subdiffraction-limited diameter are written with optical stimulated emission depletion (STED) lithography. After incubation, 98% of all nanoanchors are loaded quickly with fluorescently labeled antibodies. Controlling the size of the nanoanchors allows for limiting the number of the antibodies. Direct stochastic optical reconstruction microscopy (dSTORM) imaging, statistical distribution of fluorescence, quantitative fluorescence readout, and single molecule blinking consistently prove that 80% of the nanoanchors with a 65 nm diameter are carrying only one antibody each, which are functional as confirmed with live erythrocytes.
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36
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Saxton MJ. Wanted: a positive control for anomalous subdiffusion. Biophys J 2012; 103:2411-22. [PMID: 23260043 DOI: 10.1016/j.bpj.2012.10.038] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Revised: 09/23/2012] [Accepted: 10/10/2012] [Indexed: 11/25/2022] Open
Abstract
Anomalous subdiffusion in cells and model systems is an active area of research. The main questions are whether diffusion is anomalous or normal, and if it is anomalous, its mechanism. The subject is controversial, especially the hypothesis that crowding causes anomalous subdiffusion. Anomalous subdiffusion measurements would be strengthened by an experimental standard, particularly one able to cross-calibrate the different types of measurements. Criteria for a calibration standard are proposed. First, diffusion must be anomalous over the length and timescales of the different measurements. The length-scale is fundamental; the time scale can be adjusted through the viscosity of the medium. Second, the standard must be theoretically well understood, with a known anomalous subdiffusion exponent, ideally readily tunable. Third, the standard must be simple, reproducible, and independently characterizable (by, for example, electron microscopy for nanostructures). Candidate experimental standards are evaluated, including obstructed lipid bilayers; aqueous systems obstructed by nanopillars; a continuum percolation system in which a prescribed fraction of randomly chosen obstacles in a regular array is ablated; single-file diffusion in pores; transient anomalous subdiffusion due to binding of particles in arrays such as transcription factors in randomized DNA arrays; and computer-generated physical trajectories.
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Affiliation(s)
- Michael J Saxton
- Department of Biochemistry and Molecular Medicine, University of California at Davis, Davis, California, USA.
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37
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Jung HR, Choi JC, Cho W, Doh J. Microfabricated platforms to modulate and monitor T cell synapse assembly. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2012; 5:67-74. [DOI: 10.1002/wnan.1182] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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38
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Lohmüller T, Iversen L, Schmidt M, Rhodes C, Tu HL, Lin WC, Groves JT. Single molecule tracking on supported membranes with arrays of optical nanoantennas. NANO LETTERS 2012; 12:1717-21. [PMID: 22352856 PMCID: PMC3626319 DOI: 10.1021/nl300294b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2012] [Revised: 02/15/2012] [Indexed: 05/16/2023]
Abstract
Coupling of the localized surface plasmons between two closely apposed gold nanoparticles (nanoantenna) can cause strong enhancements of fluorescence or Raman signal intensity from molecules in the plasmonic "hot-spot". Harnessing these properties for practical applications is challenging due to the need to fabricate gold particle arrays with well-defined nanometer spacing and a means of delivering functional molecules to the hot-spot. We report fabrication of billions of plasmon-coupled nanostructures on a single substrate by a combination of colloid lithography and plasma processing. Controlled spacing of the nanoantenna gaps is achieved by taking advantage of the fact that polystyrene particles melt together at their contact point during plasma processing. The resulting polymer thread shadows a gap of well-defined spacing between each pair of gold triangles in the final array. Confocal surface-enhanced Raman spectroscopy imaging confirms the array is functionally uniform. Furthermore, a fully intact supported membrane can be formed on the intervening substrate by vesicle fusion. Trajectories of freely diffusing individual proteins are traced as they sequentially pass through, and are enhanced by, multiple gaps. The nanoantenna array thus enables enhanced observation of a fluid membrane system without static entrapment of the molecules.
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Affiliation(s)
- T. Lohmüller
- Howard Hughes Medical Institute,
Department of Chemistry, University of California, Berkeley, California 94720, United States
- Physical Biosciences and Materials
Sciences Divisions, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
| | - L. Iversen
- Howard Hughes Medical Institute,
Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - M. Schmidt
- Energy Biosciences Institute, University of California, Berkeley, California 94720,
United States
| | - C. Rhodes
- Howard Hughes Medical Institute,
Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - H.-L. Tu
- Howard Hughes Medical Institute,
Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - W.-C. Lin
- Howard Hughes Medical Institute,
Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - J. T. Groves
- Howard Hughes Medical Institute,
Department of Chemistry, University of California, Berkeley, California 94720, United States
- Physical Biosciences and Materials
Sciences Divisions, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
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39
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Narui Y, Salaita KS. Dip-pen nanolithography of optically transparent cationic polymers to manipulate spatial organization of proteolipid membranes. Chem Sci 2012. [DOI: 10.1039/c1sc00475a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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