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Farkas E, Dóra Kovács K, Szekacs I, Peter B, Lagzi I, Kitahata H, Suematsu NJ, Horvath R. Kinetic monitoring of molecular interactions during surfactant-driven self-propelled droplet motion by high spatial resolution waveguide sensing. J Colloid Interface Sci 2024; 677:352-364. [PMID: 39151228 DOI: 10.1016/j.jcis.2024.07.236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 07/29/2024] [Accepted: 07/30/2024] [Indexed: 08/19/2024]
Abstract
HYPOTHESIS Self-driven actions, like motion, are fundamental characteristics of life. Today, intense research focuses on the kinetics of droplet motion. Quantifying macroscopic motion and exploring the underlying mechanisms are crucial in self-structuring and self-healing materials, advancements in soft robotics, innovations in self-cleaning environmental processes, and progress within the pharmaceutical industry. Usually, the driving forces inducing macroscopic motion act at the molecular scale, making their real-time and high-resolution investigation challenging. Label-free surface sensitive measurements with high lateral resolution could in situ measure both molecular-scale interactions and microscopic motion. EXPERIMENTS We employ surface-sensitive label-free sensors to investigate the kinetic changes in a self-assembled monolayer of the trimethyl(octadecyl)azanium chloride surfactant on a substrate surface during the self-propelled motion of nitrobenzene droplets. The adsorption-desorption of the surfactant at various concentrations, its removal due to the moving organic droplet, and rebuilding mechanisms at droplet-visited areas are all investigated with excellent time, spatial, and surface mass density resolution. FINDINGS We discovered concentration dependent velocity fluctuations, estimated the adsorbed amount of surfactant molecules, and revealed multilayer coverage at high concentrations. The desorption rate of surfactant (18.4 s-1) during the microscopic motion of oil droplets was determined by in situ differentiating between droplet visited and non-visited areas.
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Affiliation(s)
- Eniko Farkas
- Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, HUN-REN Centre for Energy Research, 1121 Budapest, Hungary
| | - Kinga Dóra Kovács
- Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, HUN-REN Centre for Energy Research, 1121 Budapest, Hungary; Department of Biological Physics, Eötvös Loránd University, 1117 Budapest, Hungary
| | - Inna Szekacs
- Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, HUN-REN Centre for Energy Research, 1121 Budapest, Hungary
| | - Beatrix Peter
- Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, HUN-REN Centre for Energy Research, 1121 Budapest, Hungary
| | - István Lagzi
- Department of Physics, Institute of Physics, Budapest University of Technology and Economics, Muegyetem rkp. 3, 1111 Budapest, Hungary; HUN-REN-BME Condensed Matter Physics Research Group, Budapest University of Technology and Economics, Muegyetem rkp. 3, 1111 Budapest, Hungary
| | - Hiroyuki Kitahata
- Graduate School of Science, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba 263-8522, Japan
| | - Nobuhiko J Suematsu
- Meiji Institute of Advanced Study of Mathematical Sciences (MIMS), Meiji University, 4-21-1 Nakano, Tokyo 164-8525, Japan; Graduate School of Advanced Mathematical Sciences, Meiji University, 4-21-1 Nakano, Tokyo 164-8525, Japan.
| | - Robert Horvath
- Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, HUN-REN Centre for Energy Research, 1121 Budapest, Hungary; Nanobiosensorics Laboratory, Institute of Biophysics, HUN-REN Biological Research Centre, Szeged, Hungary.
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Farkas E, Tarr R, Gerecsei T, Saftics A, Kovács KD, Stercz B, Domokos J, Peter B, Kurunczi S, Szekacs I, Bonyár A, Bányai A, Fürjes P, Ruszkai-Szaniszló S, Varga M, Szabó B, Ostorházi E, Szabó D, Horvath R. Development and In-Depth Characterization of Bacteria Repellent and Bacteria Adhesive Antibody-Coated Surfaces Using Optical Waveguide Biosensing. BIOSENSORS 2022; 12:bios12020056. [PMID: 35200317 PMCID: PMC8869200 DOI: 10.3390/bios12020056] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Revised: 01/07/2022] [Accepted: 01/13/2022] [Indexed: 05/10/2023]
Abstract
Bacteria repellent surfaces and antibody-based coatings for bacterial assays have shown a growing demand in the field of biosensors, and have crucial importance in the design of biomedical devices. However, in-depth investigations and comparisons of possible solutions are still missing. The optical waveguide lightmode spectroscopy (OWLS) technique offers label-free, non-invasive, in situ characterization of protein and bacterial adsorption. Moreover, it has excellent flexibility for testing various surface coatings. Here, we describe an OWLS-based method supporting the development of bacteria repellent surfaces and characterize the layer structures and affinities of different antibody-based coatings for bacterial assays. In order to test nonspecific binding blocking agents against bacteria, OWLS chips were coated with bovine serum albumin (BSA), I-block, PAcrAM-g-(PMOXA, NH2, Si), (PAcrAM-P) and PLL-g-PEG (PP) (with different coating temperatures), and subsequent Escherichia coli adhesion was monitored. We found that the best performing blocking agents could inhibit bacterial adhesion from samples with bacteria concentrations of up to 107 cells/mL. Various immobilization methods were applied to graft a wide range of selected antibodies onto the biosensor's surface. Simple physisorption, Mix&Go (AnteoBind) (MG) films, covalently immobilized protein A and avidin-biotin based surface chemistries were all fabricated and tested. The surface adsorbed mass densities of deposited antibodies were determined, and the biosensor;s kinetic data were evaluated to divine the possible orientations of the bacteria-capturing antibodies and determine the rate constants and footprints of the binding events. The development of affinity layers was supported by enzyme-linked immunosorbent assay (ELISA) measurements in order to test the bacteria binding capabilities of the antibodies. The best performance in the biosensor measurements was achieved by employing a polyclonal antibody in combination with protein A-based immobilization and PAcrAM-P blocking of nonspecific binding. Using this setting, a surface sensitivity of 70 cells/mm2 was demonstrated.
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Affiliation(s)
- Eniko Farkas
- Centre for Energy Research, Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, 1121 Budapest, Hungary; (E.F.); (R.T.); (T.G.); (A.S.); (K.D.K.); (B.P.); (S.K.); (I.S.)
| | - Robert Tarr
- Centre for Energy Research, Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, 1121 Budapest, Hungary; (E.F.); (R.T.); (T.G.); (A.S.); (K.D.K.); (B.P.); (S.K.); (I.S.)
- Department of Electronics Technology, Faculty of Electrical Engineering and Informatics, Budapest University of Technology and Economics, 1111 Budapest, Hungary;
| | - Tamás Gerecsei
- Centre for Energy Research, Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, 1121 Budapest, Hungary; (E.F.); (R.T.); (T.G.); (A.S.); (K.D.K.); (B.P.); (S.K.); (I.S.)
- Department of Biological Physics, Eötvös Loránd University, 1117 Budapest, Hungary
| | - Andras Saftics
- Centre for Energy Research, Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, 1121 Budapest, Hungary; (E.F.); (R.T.); (T.G.); (A.S.); (K.D.K.); (B.P.); (S.K.); (I.S.)
| | - Kinga Dóra Kovács
- Centre for Energy Research, Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, 1121 Budapest, Hungary; (E.F.); (R.T.); (T.G.); (A.S.); (K.D.K.); (B.P.); (S.K.); (I.S.)
- Department of Biological Physics, Eötvös Loránd University, 1117 Budapest, Hungary
| | - Balazs Stercz
- Institute of Medical Microbiology, Semmelweis University, 1089 Budapest, Hungary; (B.S.); (J.D.); (E.O.); (D.S.)
| | - Judit Domokos
- Institute of Medical Microbiology, Semmelweis University, 1089 Budapest, Hungary; (B.S.); (J.D.); (E.O.); (D.S.)
| | - Beatrix Peter
- Centre for Energy Research, Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, 1121 Budapest, Hungary; (E.F.); (R.T.); (T.G.); (A.S.); (K.D.K.); (B.P.); (S.K.); (I.S.)
| | - Sandor Kurunczi
- Centre for Energy Research, Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, 1121 Budapest, Hungary; (E.F.); (R.T.); (T.G.); (A.S.); (K.D.K.); (B.P.); (S.K.); (I.S.)
| | - Inna Szekacs
- Centre for Energy Research, Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, 1121 Budapest, Hungary; (E.F.); (R.T.); (T.G.); (A.S.); (K.D.K.); (B.P.); (S.K.); (I.S.)
| | - Attila Bonyár
- Department of Electronics Technology, Faculty of Electrical Engineering and Informatics, Budapest University of Technology and Economics, 1111 Budapest, Hungary;
| | - Anita Bányai
- Centre for Energy Research, Microsystems Lab, Institute of Technical Physics and Materials Science, 1121 Budapest, Hungary; (A.B.); (P.F.)
| | - Péter Fürjes
- Centre for Energy Research, Microsystems Lab, Institute of Technical Physics and Materials Science, 1121 Budapest, Hungary; (A.B.); (P.F.)
| | | | - Máté Varga
- 77 Elektronika Ltd., 1116 Budapest, Hungary; (S.R.-S.); (M.V.); (B.S.)
| | - Barnabás Szabó
- 77 Elektronika Ltd., 1116 Budapest, Hungary; (S.R.-S.); (M.V.); (B.S.)
| | - Eszter Ostorházi
- Institute of Medical Microbiology, Semmelweis University, 1089 Budapest, Hungary; (B.S.); (J.D.); (E.O.); (D.S.)
| | - Dóra Szabó
- Institute of Medical Microbiology, Semmelweis University, 1089 Budapest, Hungary; (B.S.); (J.D.); (E.O.); (D.S.)
| | - Robert Horvath
- Centre for Energy Research, Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, 1121 Budapest, Hungary; (E.F.); (R.T.); (T.G.); (A.S.); (K.D.K.); (B.P.); (S.K.); (I.S.)
- Correspondence:
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Saftics A, Kurunczi S, Peter B, Szekacs I, Ramsden JJ, Horvath R. Data evaluation for surface-sensitive label-free methods to obtain real-time kinetic and structural information of thin films: A practical review with related software packages. Adv Colloid Interface Sci 2021; 294:102431. [PMID: 34330074 DOI: 10.1016/j.cis.2021.102431] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 04/16/2021] [Accepted: 04/18/2021] [Indexed: 02/07/2023]
Abstract
Interfacial layers are important in a wide range of applications in biomedicine, biosensing, analytical chemistry and the maritime industries. Given the growing number of applications, analysis of such layers and understanding their behavior is becoming crucial. Label-free surface sensitive methods are excellent for monitoring the formation kinetics, structure and its evolution of thin layers, even at the nanoscale. In this paper, we review existing and commercially available label-free techniques and demonstrate how the experimentally obtained data can be utilized to extract kinetic and structural information during and after formation, and any subsequent adsorption/desorption processes. We outline techniques, some traditional and some novel, based on the principles of optical and mechanical transduction. Our special focus is the current possibilities of combining label-free methods, which is a powerful approach to extend the range of detected and deduced parameters. We summarize the most important theoretical considerations for obtaining reliable information from measurements taking place in liquid environments and, hence, with layers in a hydrated state. A thorough treamtmaent of the various kinetic and structural quantities obtained from evaluation of the raw label-free data are provided. Such quantities include layer thickness, refractive index, optical anisotropy (and molecular orientation derived therefrom), degree of hydration, viscoelasticity, as well as association and dissociation rate constants and occupied area of subsequently adsorbed species. To demonstrate the effect of variations in model conditions on the observed data, simulations of kinetic curves at various model settings are also included. Based on our own extensive experience with optical waveguide lightmode spectroscopy (OWLS) and the quartz crystal microbalance (QCM), we have developed dedicated software packages for data analysis, which are made available to the scientific community alongside this paper.
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Jankovics H, Kovacs B, Saftics A, Gerecsei T, Tóth É, Szekacs I, Vonderviszt F, Horvath R. Grating-coupled interferometry reveals binding kinetics and affinities of Ni ions to genetically engineered protein layers. Sci Rep 2020; 10:22253. [PMID: 33335217 PMCID: PMC7746762 DOI: 10.1038/s41598-020-79226-w] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Accepted: 12/03/2020] [Indexed: 12/18/2022] Open
Abstract
Reliable measurement of the binding kinetics of low molecular weight analytes to their targets is still a challenging task. Often, the introduction of labels is simply impossible in such measurements, and the application of label-free methods is the only reliable choice. By measuring the binding kinetics of Ni(II) ions to genetically modified flagellin layers, we demonstrate that: (1) Grating-Coupled Interferometry (GCI) is well suited to resolve the binding of ions, even at very low protein immobilization levels; (2) it supplies high quality kinetic data from which the number and strength of available binding sites can be determined, and (3) the rate constants of the binding events can also be obtained with high accuracy. Experiments were performed using a flagellin variant incorporating the C-terminal domain of the nickel-responsive transcription factor NikR. GCI results were compared to affinity data from titration calorimetry. We found that besides the low-affinity binding sites characterized by a micromolar dissociation constant (Kd), tetrameric FliC-NikRC molecules possess high-affinity binding sites with Kd values in the nanomolar range. GCI enabled us to obtain real-time kinetic data for the specific binding of an analyte with molar mass as low as 59 Da, even at signals lower than 1 pg/mm2.
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Affiliation(s)
- Hajnalka Jankovics
- Bio-Nanosystems Laboratory, Research Institute of Biomolecular and Chemical Engineering, University of Pannonia, Egyetem u. 10, Veszprém, Hungary
| | - Boglarka Kovacs
- Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, Centre for Energy Research, Konkoly-Thege Miklós út 29-33, Budapest, Hungary
| | - Andras Saftics
- Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, Centre for Energy Research, Konkoly-Thege Miklós út 29-33, Budapest, Hungary
| | - Tamas Gerecsei
- Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, Centre for Energy Research, Konkoly-Thege Miklós út 29-33, Budapest, Hungary
| | - Éva Tóth
- Bio-Nanosystems Laboratory, Research Institute of Biomolecular and Chemical Engineering, University of Pannonia, Egyetem u. 10, Veszprém, Hungary
| | - Inna Szekacs
- Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, Centre for Energy Research, Konkoly-Thege Miklós út 29-33, Budapest, Hungary
| | - Ferenc Vonderviszt
- Bio-Nanosystems Laboratory, Research Institute of Biomolecular and Chemical Engineering, University of Pannonia, Egyetem u. 10, Veszprém, Hungary
- Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, Centre for Energy Research, Konkoly-Thege Miklós út 29-33, Budapest, Hungary
| | - Robert Horvath
- Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, Centre for Energy Research, Konkoly-Thege Miklós út 29-33, Budapest, Hungary.
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Gauglitz G. Critical assessment of relevant methods in the field of biosensors with direct optical detection based on fibers and waveguides using plasmonic, resonance, and interference effects. Anal Bioanal Chem 2020; 412:3317-3349. [PMID: 32313998 PMCID: PMC7214504 DOI: 10.1007/s00216-020-02581-0] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 02/28/2020] [Accepted: 03/04/2020] [Indexed: 12/16/2022]
Abstract
Direct optical detection has proven to be a highly interesting tool in biomolecular interaction analysis to be used in drug discovery, ligand/receptor interactions, environmental analysis, clinical diagnostics, screening of large data volumes in immunology, cancer therapy, or personalized medicine. In this review, the fundamental optical principles and applications are reviewed. Devices are based on concepts such as refractometry, evanescent field, waveguides modes, reflectometry, resonance and/or interference. They are realized in ring resonators; prism couplers; surface plasmon resonance; resonant mirror; Bragg grating; grating couplers; photonic crystals, Mach-Zehnder, Young, Hartman interferometers; backscattering; ellipsometry; or reflectance interferometry. The physical theories of various optical principles have already been reviewed in detail elsewhere and are therefore only cited. This review provides an overall survey on the application of these methods in direct optical biosensing. The "historical" development of the main principles is given to understand the various, and sometimes only slightly modified variations published as "new" methods or the use of a new acronym and commercialization by different companies. Improvement of optics is only one way to increase the quality of biosensors. Additional essential aspects are the surface modification of transducers, immobilization strategies, selection of recognition elements, the influence of non-specific interaction, selectivity, and sensitivity. Furthermore, papers use for reporting minimal amounts of detectable analyte terms such as value of mass, moles, grams, or mol/L which are difficult to compare. Both these essential aspects (i.e., biochemistry and the presentation of LOD values) can be discussed only in brief (but references are provided) in order to prevent the paper from becoming too long. The review will concentrate on a comparison of the optical methods, their application, and the resulting bioanalytical quality.
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Affiliation(s)
- Günter Gauglitz
- Institute of Physical and Theoretical Chemistry, Eberhard Karls Universität, Auf der Morgenstelle 18, 72076, Tübingen, Germany.
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Debreczeni ML, Szekacs I, Kovacs B, Saftics A, Kurunczi S, Gál P, Dobó J, Cervenak L, Horvath R. Human primary endothelial label-free biochip assay reveals unpredicted functions of plasma serine proteases. Sci Rep 2020; 10:3303. [PMID: 32094469 PMCID: PMC7039951 DOI: 10.1038/s41598-020-60158-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 02/07/2020] [Indexed: 11/09/2022] Open
Abstract
Tissue-on-a-chip technologies are more and more important in the investigation of cellular function and in the development of novel drugs by allowing the direct screening of substances on human cells. Constituting the inner lining of vessel walls, endothelial cells are the key players in various physiological processes, moreover, they are the first to be exposed to most drugs currently used. However, to date, there is still no appropriate technology for the label-free, real-time and high-throughput monitoring of endothelial function. To this end, we developed an optical biosensor-based endothelial label-free biochip (EnLaB) assay that meets all the above requirements. Using our EnLaB platform, we screened a set of plasma serine proteases as possible endothelial cell activators, and first identified the endothelial cell activating function of three important serine proteases - namely kallikrein, C1r and mannan-binding lectin-associated serine-protease 2 (MASP-2) - and verified these results in well-established functional assays. EnLaB proved to be an effective tool for revealing novel cellular mechanisms as well as for the high-throughput screening of various compounds on endothelial cells.
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Affiliation(s)
| | - Inna Szekacs
- Nanobiosensorics Momentum Group, Institute of Technical Physics and Materials Science, Centre for Energy Research, Konkoly-Thege M. út 29-33, H-1120, Budapest, Hungary
| | - Boglarka Kovacs
- Nanobiosensorics Momentum Group, Institute of Technical Physics and Materials Science, Centre for Energy Research, Konkoly-Thege M. út 29-33, H-1120, Budapest, Hungary
| | - Andras Saftics
- Nanobiosensorics Momentum Group, Institute of Technical Physics and Materials Science, Centre for Energy Research, Konkoly-Thege M. út 29-33, H-1120, Budapest, Hungary
| | - Sándor Kurunczi
- Nanobiosensorics Momentum Group, Institute of Technical Physics and Materials Science, Centre for Energy Research, Konkoly-Thege M. út 29-33, H-1120, Budapest, Hungary
| | - Péter Gál
- Institute of Enzymology, Research Centre for Natural Sciences, H-1113, Budapest, Hungary
| | - József Dobó
- Institute of Enzymology, Research Centre for Natural Sciences, H-1113, Budapest, Hungary
| | - László Cervenak
- 3rd Department of Internal Medicine, Semmelweis University, Budapest, Hungary.
| | - Robert Horvath
- 3rd Department of Internal Medicine, Semmelweis University, Budapest, Hungary.
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Adhesion force measurements on functionalized microbeads: An in-depth comparison of computer controlled micropipette and fluidic force microscopy. J Colloid Interface Sci 2019; 555:245-253. [DOI: 10.1016/j.jcis.2019.07.102] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 07/29/2019] [Accepted: 07/30/2019] [Indexed: 01/01/2023]
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Scherr TF, Markwalter CF, Bauer WS, Gasperino D, Wright DW, Haselton FR. Application of mass transfer theory to biomarker capture by surface functionalized magnetic beads in microcentrifuge tubes. Adv Colloid Interface Sci 2017; 246:275-288. [PMID: 28595937 DOI: 10.1016/j.cis.2017.02.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 02/15/2017] [Accepted: 02/15/2017] [Indexed: 12/11/2022]
Abstract
In many diagnostic assays, specific biomarker extraction and purification from a patient sample is performed in microcentrifuge tubes using surface-functionalized magnetic beads. Although assay binding times are known to be highly dependent on sample viscosity, sample volume, capture reagent, and fluid mixing, the theoretical mass transport framework that has been developed and validated in engineering has yet to be applied in this context. In this work, we adapt this existing framework for simultaneous mass transfer and surface reaction and apply it to the binding of biomarkers in clinical samples to surface-functionalized magnetic beads. We discuss the fundamental fluid dynamics of vortex mixing within microcentrifuge tubes as well as describe how particles and biomolecules interact with the fluid. The model is solved over a wide range of parameters, and we present scenarios when a simplified analytical expression would be most accurate. Next, we review of some relevant techniques for model parameter estimation. Finally, we apply the mass transfer theory to practical use-case scenarios of immediate use to clinicians and assay developers. Throughout, we highlight where further characterization is necessary to bridge the gap between theory and practical application.
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Peter B, Farkas E, Forgacs E, Saftics A, Kovacs B, Kurunczi S, Szekacs I, Csampai A, Bosze S, Horvath R. Green tea polyphenol tailors cell adhesivity of RGD displaying surfaces: multicomponent models monitored optically. Sci Rep 2017; 7:42220. [PMID: 28186133 PMCID: PMC5301484 DOI: 10.1038/srep42220] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 01/03/2017] [Indexed: 01/17/2023] Open
Abstract
The interaction of the anti-adhesive coating, poly(L-lysine)-graft-poly(ethylene glycol) (PLL-g-PEG) and its Arg-Gly-Asp (RGD) functionalized form, PLL-g-PEG-RGD, with the green tea polyphenol, epigallocatechin-gallate (EGCg) was in situ monitored. After, the kinetics of cellular adhesion on the EGCg exposed coatings were recorded in real-time. The employed plate-based waveguide biosensor is applicable to monitor small molecule binding and sensitive to sub-nanometer scale changes in cell membrane position and cell mass distribution; while detecting the signals of thousands of adhering cells. The combination of this remarkable sensitivity and throughput opens up new avenues in testing complicated models of cell-surface interactions. The systematic studies revealed that, despite the reported excellent antifouling properties of the coatings, EGCg strongly interacted with them, and affected their cell adhesivity in a concentration dependent manner. Moreover, the differences between the effects of the fresh and oxidized EGCg solutions were first demonstrated. Using a semiempirical quantumchemical method we showed that EGCg binds to the PEG chains of PLL-g-PEG-RGD and effectively blocks the RGD sites by hydrogen bonds. The calculations supported the experimental finding that the binding is stronger for the oxidative products. Our work lead to a new model of polyphenol action on cell adhesion ligand accessibility and matrix rigidity.
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Affiliation(s)
- Beatrix Peter
- Doctoral School of Molecular and Nanotechnologies, Faculty of Information Technology, University of Pannonia, H-8200 Egyetem u. 10, Veszprém, Hungary
- Nanobiosensorics Group, Hungarian Academy of Sciences, Research Centre for Natural Sciences, Institute for Technical Physics and Materials Science, Konkoly-Thege u, 29-33, H-1120 Budapest, Hungary
| | - Eniko Farkas
- Nanobiosensorics Group, Hungarian Academy of Sciences, Research Centre for Natural Sciences, Institute for Technical Physics and Materials Science, Konkoly-Thege u, 29-33, H-1120 Budapest, Hungary
- Chemical Engineering and Material Science Doctoral School, University of Pannonia, H-8200 Egyetem u, 10, Veszprém, Hungary
| | - Eniko Forgacs
- Nanobiosensorics Group, Hungarian Academy of Sciences, Research Centre for Natural Sciences, Institute for Technical Physics and Materials Science, Konkoly-Thege u, 29-33, H-1120 Budapest, Hungary
| | - Andras Saftics
- Nanobiosensorics Group, Hungarian Academy of Sciences, Research Centre for Natural Sciences, Institute for Technical Physics and Materials Science, Konkoly-Thege u, 29-33, H-1120 Budapest, Hungary
- George Olah Doctoral School, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, Budapest 1111, Hungary
| | - Boglarka Kovacs
- Nanobiosensorics Group, Hungarian Academy of Sciences, Research Centre for Natural Sciences, Institute for Technical Physics and Materials Science, Konkoly-Thege u, 29-33, H-1120 Budapest, Hungary
- Chemical Engineering and Material Science Doctoral School, University of Pannonia, H-8200 Egyetem u, 10, Veszprém, Hungary
| | - Sandor Kurunczi
- Nanobiosensorics Group, Hungarian Academy of Sciences, Research Centre for Natural Sciences, Institute for Technical Physics and Materials Science, Konkoly-Thege u, 29-33, H-1120 Budapest, Hungary
| | - Inna Szekacs
- Nanobiosensorics Group, Hungarian Academy of Sciences, Research Centre for Natural Sciences, Institute for Technical Physics and Materials Science, Konkoly-Thege u, 29-33, H-1120 Budapest, Hungary
| | - Antal Csampai
- Institute of Chemistry, Eötvös Loránd University, Budapest 112, POB 32, H-1518, Hungary
| | - Szilvia Bosze
- MTA-ELTE Research Group of Peptide Chemistry, Hungarian Academy of Sciences, Eötvös Loránd University, Budapest 112, POB 32, H-1518, Hungary
| | - Robert Horvath
- Nanobiosensorics Group, Hungarian Academy of Sciences, Research Centre for Natural Sciences, Institute for Technical Physics and Materials Science, Konkoly-Thege u, 29-33, H-1120 Budapest, Hungary
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Surface rearrangement of adsorbed EGCG–mucin complexes on hydrophilic surfaces. Int J Biol Macromol 2017; 95:704-712. [DOI: 10.1016/j.ijbiomac.2016.11.108] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Revised: 11/29/2016] [Accepted: 11/29/2016] [Indexed: 12/13/2022]
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Saftics A, Kurunczi S, Szekrényes Z, Kamarás K, Khánh NQ, Sulyok A, Bſsze S, Horvath R. Fabrication and characterization of ultrathin dextran layers: Time dependent nanostructure in aqueous environments revealed by OWLS. Colloids Surf B Biointerfaces 2016; 146:861-70. [DOI: 10.1016/j.colsurfb.2016.06.057] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 06/24/2016] [Accepted: 06/27/2016] [Indexed: 11/30/2022]
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Kovacs B, Patko D, Szekacs I, Orgovan N, Kurunczi S, Sulyok A, Khanh NQ, Toth B, Vonderviszt F, Horvath R. Flagellin based biomimetic coatings: From cell-repellent surfaces to highly adhesive coatings. Acta Biomater 2016; 42:66-76. [PMID: 27381523 DOI: 10.1016/j.actbio.2016.07.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2016] [Revised: 06/28/2016] [Accepted: 07/01/2016] [Indexed: 10/21/2022]
Abstract
UNLABELLED Biomimetic coatings with cell-adhesion-regulating functionalities are intensively researched today. For example, cell-based biosensing for drug development, biomedical implants, and tissue engineering require that the surface adhesion of living cells is well controlled. Recently, we have shown that the bacterial flagellar protein, flagellin, adsorbs through its terminal segments to hydrophobic surfaces, forming an oriented monolayer and exposing its variable D3 domain to the solution. Here, we hypothesized that this nanostructured layer is highly cell-repellent since it mimics the surface of the flagellar filaments. Moreover, we proposed flagellin as a carrier molecule to display the cell-adhesive RGD (Arg-Gly-Asp) peptide sequence and induce cell adhesion on the coated surface. The D3 domain of flagellin was replaced with one or more RGD motifs linked by various oligopeptides modulating flexibility and accessibility of the inserted segment. The obtained flagellin variants were applied to create surface coatings inducing cell adhesion and spreading to different levels, while wild-type flagellin was shown to form a surface layer with strong anti-adhesive properties. As reference surfaces synthetic polymers were applied which have anti-adhesive (PLL-g-PEG poly(l-lysine)-graft-poly(ethylene glycol)) or adhesion inducing properties (RGD-functionalized PLL-g-PEG). Quantitative adhesion data was obtained by employing optical biochips and microscopy. Cell-adhesion-regulating coatings can be simply formed on hydrophobic surfaces by using the developed flagellin-based constructs. The developed novel RGD-displaying flagellin variants can be easily obtained by bacterial production and can serve as alternatives to create cell-adhesion-regulating biomimetic coatings. STATEMENT OF SIGNIFICANCE In the present work, we show for the first time that.
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Burlachenko J, Kruglenko I, Snopok B, Persaud K. Sample handling for electronic nose technology: State of the art and future trends. Trends Analyt Chem 2016. [DOI: 10.1016/j.trac.2016.06.007] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Adhesion kinetics of human primary monocytes, dendritic cells, and macrophages: Dynamic cell adhesion measurements with a label-free optical biosensor and their comparison with end-point assays. Biointerphases 2016; 11:031001. [DOI: 10.1116/1.4954789] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Farkas E, Srankó D, Kerner Z, Setner B, Szewczuk Z, Malinka W, Horvath R, Szyrwiel Ł, Pap JS. Self-assembled, nanostructured coatings for water oxidation by alternating deposition of Cu-branched peptide electrocatalysts and polyelectrolytes. Chem Sci 2016; 7:5249-5259. [PMID: 30155174 PMCID: PMC6020527 DOI: 10.1039/c6sc00595k] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2016] [Accepted: 04/19/2016] [Indexed: 01/19/2023] Open
Abstract
This work demonstrates the heterogenization of homogeneous water oxidation electrocatalysts in surface coatings produced by combining the substances with a suitable polyelectrolyte.
This work demonstrates the heterogenization of homogeneous water oxidation electrocatalysts in surface coatings produced by combining the substances with a suitable polyelectrolyte. The electrocatalysts i.e. Cu(ii)-branched peptide complexes involving a 2,3-l-diaminopropionic acid junction unit are heterogenized by building composite layers on indium-tin-oxide (ITO) electrode surface. Alternating deposition of the peptide complexes and poly(l-lysine) or poly(allylamine hydrochloride) were carried out in the presence of phosphate in a pH range of 7.5–10.5. Discussion of the results is divided to (1) characteristics of composite layer buildup and (2) electrocatalytic water oxidation and accompanying changes of these layers. For (1), optical waveguide lightmode spectroscopy (OWLS) has been applied to reveal the layer-by-layer formation of a Cu-ligand/polyelectrolyte/phosphate coating. The fabricated structures had a nanoporous topography (atomic force microscopy). As for (2), electrochemistry employing coated ITO substrates indicated improved water oxidation electrocatalysis vs. neat ITO and dependence of this improvement on the presence or absence of a histidine ligand in the deposited Cu(ii)-complexes equally, as observed in homogeneous systems. Electrochemical OWLS revealed changes in the coatings in operando, upon alternating positive–zero–positive etc. polarization: after some initial loss of the coating mass steady-state electrolysis was sustained by a compact and stable layer. According to X-ray photoelectron spectroscopy Cu remains in an N-donor ligand environment after electrolysis.
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Affiliation(s)
- Enikő Farkas
- Nanobiosensorics Group , MTA Centre for Energy Research - MFA , H-1121 Budapest , Hungary . .,Doctoral School of Molecular- and Nanotechnologies , Faculty of Information Technology , University of Pannonia , Egyetem u. 10 , H-8200 Veszprém , Hungary
| | - Dávid Srankó
- Surface Chemistry and Catalysis Department , MTA Centre for Energy Research , Konkoly Thege str. 29-33 , H-1121 Budapest , Hungary .
| | - Zsolt Kerner
- Surface Chemistry and Catalysis Department , MTA Centre for Energy Research , Konkoly Thege str. 29-33 , H-1121 Budapest , Hungary .
| | - Bartosz Setner
- Faculty of Chemistry , Univ. of Wrocław , ul. F. Joliot-Curie 14 , 50-383 Wrocław , Poland
| | - Zbigniew Szewczuk
- Faculty of Chemistry , Univ. of Wrocław , ul. F. Joliot-Curie 14 , 50-383 Wrocław , Poland
| | - Wiesław Malinka
- Dept of Chemistry of Drugs , Wrocław Medical Univ. , ul. Borowska 211 , 50-552 Wrocław , Poland .
| | - Robert Horvath
- Nanobiosensorics Group , MTA Centre for Energy Research - MFA , H-1121 Budapest , Hungary .
| | - Łukasz Szyrwiel
- Dept of Chemistry of Drugs , Wrocław Medical Univ. , ul. Borowska 211 , 50-552 Wrocław , Poland . .,CNRS/UPPA , LCABIE , UMR5254 , Helioparc, 2, av. Pr. Angot, Pau , F-64053 , France
| | - József S Pap
- Surface Chemistry and Catalysis Department , MTA Centre for Energy Research , Konkoly Thege str. 29-33 , H-1121 Budapest , Hungary .
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Farkas E, Patko D, Khanh NQ, Toth E, Vonderviszt F, Horvath R. Self-assembly and structure of flagellin–polyelectrolyte composite layers: polyelectrolyte induced flagellar filament formation during the alternating deposition process. RSC Adv 2016. [DOI: 10.1039/c6ra19010c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
This study first reveals a new type of linearly growing polyelectrolyte multilayer buildup mechanism, when one of the components (PAH) induces the self-assembly of the oppositely charged component (flagellin), creating a filamentous nanostructured coating.
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Affiliation(s)
- Eniko Farkas
- Nanobiosensorics Laboratory
- Institute for Technical Physics and Materials Science
- MTA EK MFA
- Budapest
- Hungary
| | - Daniel Patko
- Nanobiosensorics Laboratory
- Institute for Technical Physics and Materials Science
- MTA EK MFA
- Budapest
- Hungary
| | - Nguyen Quoc Khanh
- MEMS Laboratory
- Institute for Technical Physics and Materials Science
- Microtechnology Group
- MTA EK MFA
- Budapest
| | - Eva Toth
- Doctoral School of Molecular and Nanotechnologies
- Faculty of Information Technology
- University of Pannonia
- Hungary
- Bio-Nanosystems Laboratory
| | - Ferenc Vonderviszt
- Nanobiosensorics Laboratory
- Institute for Technical Physics and Materials Science
- MTA EK MFA
- Budapest
- Hungary
| | - Robert Horvath
- Nanobiosensorics Laboratory
- Institute for Technical Physics and Materials Science
- MTA EK MFA
- Budapest
- Hungary
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Mondal K, Sharma A. Recent advances in electrospun metal-oxide nanofiber based interfaces for electrochemical biosensing. RSC Adv 2016. [DOI: 10.1039/c6ra21477k] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Synthesis of various electrospun metal-oxide nanofibers and their application towards electrochemical enzymatic and enzyme-free biosensor platforms has been critically discussed.
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Affiliation(s)
- Kunal Mondal
- Department of Chemical and Biomolecular Engineering
- North Carolina State University
- Raleigh
- USA
| | - Ashutosh Sharma
- Department of Chemical Engineering
- Indian Institute of Technology Kanpur
- Kanpur-208016
- India
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Peter B, Kurunczi S, Patko D, Lagzi I, Kowalczyk B, Rácz Z, Grzybowski BA, Horvath R. Label-free in situ optical monitoring of the adsorption of oppositely charged metal nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:13478-13482. [PMID: 25361404 DOI: 10.1021/la5029405] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The mechanism of alternating deposition of oppositely charged gold nanoparticles (AuNPs) was investigated by optical waveguide lightmode spectroscopy (OWLS). OWLS allows monitoring of the kinetics of layer-by-layer (LbL) adsorption of positively and negatively charged nanoparticles in real time without using any labels so that the dynamics of layer formation can be revealed. Positively charged NPs that are already deposited on a negatively charged glass substrate strongly facilitate the adsorption of the negatively charged particles. The morphology of the adsorbed layer was also investigated with atomic force microscopy (AFM). AFM revealed that the interaction between oppositely charged particles results in the formation of NP clusters with sizes varying between 100 and 6000 NPs. The cluster size distribution is found to be an exponentially decaying function, and we propose a simple theory to explain this finding.
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Affiliation(s)
- Beatrix Peter
- Doctoral School of Molecular- and Nanotechnology, University of Pannonia , H-8201 Veszprém, Hungary
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Single cell adhesion assay using computer controlled micropipette. PLoS One 2014; 9:e111450. [PMID: 25343359 PMCID: PMC4208850 DOI: 10.1371/journal.pone.0111450] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Accepted: 09/04/2014] [Indexed: 01/20/2023] Open
Abstract
Cell adhesion is a fundamental phenomenon vital for all multicellular organisms. Recognition of and adhesion to specific macromolecules is a crucial task of leukocytes to initiate the immune response. To gain statistically reliable information of cell adhesion, large numbers of cells should be measured. However, direct measurement of the adhesion force of single cells is still challenging and today’s techniques typically have an extremely low throughput (5–10 cells per day). Here, we introduce a computer controlled micropipette mounted onto a normal inverted microscope for probing single cell interactions with specific macromolecules. We calculated the estimated hydrodynamic lifting force acting on target cells by the numerical simulation of the flow at the micropipette tip. The adhesion force of surface attached cells could be accurately probed by repeating the pick-up process with increasing vacuum applied in the pipette positioned above the cell under investigation. Using the introduced methodology hundreds of cells adhered to specific macromolecules were measured one by one in a relatively short period of time (∼30 min). We blocked nonspecific cell adhesion by the protein non-adhesive PLL-g-PEG polymer. We found that human primary monocytes are less adherent to fibrinogen than their in vitro differentiated descendants: macrophages and dendritic cells, the latter producing the highest average adhesion force. Validation of the here introduced method was achieved by the hydrostatic step-pressure micropipette manipulation technique. Additionally the result was reinforced in standard microfluidic shear stress channels. Nevertheless, automated micropipette gave higher sensitivity and less side-effect than the shear stress channel. Using our technique, the probed single cells can be easily picked up and further investigated by other techniques; a definite advantage of the computer controlled micropipette. Our experiments revealed the existence of a sub-population of strongly fibrinogen adherent cells appearing in macrophages and highly represented in dendritic cells, but not observed in monocytes.
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Nador J, Orgovan N, Fried M, Petrik P, Sulyok A, Ramsden JJ, Korosi L, Horvath R. Enhanced protein adsorption and cellular adhesion using transparent titanate nanotube thin films made by a simple and inexpensive room temperature process: Application to optical biochips. Colloids Surf B Biointerfaces 2014; 122:491-497. [DOI: 10.1016/j.colsurfb.2014.07.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 06/24/2014] [Accepted: 07/12/2014] [Indexed: 10/25/2022]
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