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Fayad S, Morin P, Nehmé R. Use of chromatographic and electrophoretic tools for assaying elastase, collagenase, hyaluronidase, and tyrosinase activity. J Chromatogr A 2017; 1529:1-28. [PMID: 29132826 DOI: 10.1016/j.chroma.2017.11.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 10/20/2017] [Accepted: 11/01/2017] [Indexed: 01/01/2023]
Abstract
Elastase, collagenase, hyaluronidase and tyrosinase, are very interesting enzymes due to their direct implication in skin aging and as therapeutic hits. Different techniques can be used to study these enzymes and to evaluate the influence of effectors on their kinetics. Nowadays, analytical techniques have become frequently used tools for miniaturizing enzyme assays. The main intention of this article is to review chromatographic and electrophoretic tools that study the four enzymes above mentioned. More specifically, the use of high-performance liquid chromatography and capillary electrophoresis and their derivative techniques for monitoring these enzymes will be investigated. The advantages and limitations of these assays will also be discussed. The original use of microscale thermophoresis and thin layer chromatography in this domain will also be covered.
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Affiliation(s)
- Syntia Fayad
- Institut de Chimie Organique et Analytique (ICOA), Université d'Orléans - CNRS, UMR 7311, Orléans, France
| | - Philippe Morin
- Institut de Chimie Organique et Analytique (ICOA), Université d'Orléans - CNRS, UMR 7311, Orléans, France
| | - Reine Nehmé
- Institut de Chimie Organique et Analytique (ICOA), Université d'Orléans - CNRS, UMR 7311, Orléans, France.
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Rother S, Galiazzo VD, Kilian D, Fiebig KM, Becher J, Moeller S, Hempel U, Schnabelrauch M, Waltenberger J, Scharnweber D, Hintze V. Hyaluronan/Collagen Hydrogels with Sulfated Hyaluronan for Improved Repair of Vascularized Tissue Tune the Binding of Proteins and Promote Endothelial Cell Growth. Macromol Biosci 2017; 17. [DOI: 10.1002/mabi.201700154] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Revised: 05/29/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Sandra Rother
- Institute of Materials Science; Max Bergmann Center of Biomaterials; TU Dresden, Budapester Str. 27 01069 Dresden Germany
| | - Vanessa D. Galiazzo
- Institute of Materials Science; Max Bergmann Center of Biomaterials; TU Dresden, Budapester Str. 27 01069 Dresden Germany
| | - David Kilian
- Institute of Materials Science; Max Bergmann Center of Biomaterials; TU Dresden, Budapester Str. 27 01069 Dresden Germany
| | - Karen M. Fiebig
- Institute of Materials Science; Max Bergmann Center of Biomaterials; TU Dresden, Budapester Str. 27 01069 Dresden Germany
| | - Jana Becher
- Biomaterials Department; INNOVENT e.V.; Prüssingstr. 27B 07745 Jena Germany
| | - Stephanie Moeller
- Biomaterials Department; INNOVENT e.V.; Prüssingstr. 27B 07745 Jena Germany
| | - Ute Hempel
- Institute of Physiological Chemistry; Carl Gustav Carus Faculty of Medicine; TU Dresden; Fiedlerstraße 42 01307 Dresden Germany
| | | | - Johannes Waltenberger
- Department of Cardiovascular Medicine; University of Münster; Albert-Schweitzer-Campus 1 48149 Münster Germany
| | - Dieter Scharnweber
- Institute of Materials Science; Max Bergmann Center of Biomaterials; TU Dresden, Budapester Str. 27 01069 Dresden Germany
| | - Vera Hintze
- Institute of Materials Science; Max Bergmann Center of Biomaterials; TU Dresden, Budapester Str. 27 01069 Dresden Germany
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Syntia F, Nehmé R, Claude B, Morin P. Human neutrophil elastase inhibition studied by capillary electrophoresis with laser induced fluorescence detection and microscale thermophoresis. J Chromatogr A 2016; 1431:215-223. [PMID: 26777089 DOI: 10.1016/j.chroma.2015.12.079] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 12/22/2015] [Accepted: 12/28/2015] [Indexed: 12/13/2022]
Abstract
Capillary electrophoresis-laser induced fluorescence (CZE-LIF) and microscale thermophoresis (MST) were used for the first time to study the inhibition of human neutrophil elastase (HNE). We recently studied HNE kinetics (Km and Vmax) by developing an in-capillary CZE-LIF assay based on transverse diffusion of laminar flow profiles (TDLFP) for reactant mixing. In this work, the former assay was adapted to monitor HNE inhibition. Two natural well known HNE inhibitors from the triterpene family, ursolic acid and oleanolic acid, were tested to validate the developed assay. Since the solubility of pentacyclic triterpenes in aqueous media where the enzymatic reaction will take place is limited, the effect of DMSO and ethanol on HNE was studied using microscale thermophoresis (MST). An agglomeration of the enzyme was revealed when preparing the inhibitor in 5% (v/v) DMSO. This phenomenon did not occur in the presence of ethanol. Therefore, ethanol was used as inhibitor solvent, at a limited percentage of 20% (v/v). In these conditions and after optimization of the TDLFP approach, the repeatability (RSD on migration times and peak-areas inferior to 2.2%) of the CZE-LIF assay and the sensitivity (LOQ of few nM) were found to be satisfactory for conducting inhibition assays. IC50 values for ursolic and oleanolic acid were successfully determined. They were respectively equal to 5.62±0.10μM (r(2)=0.9807; n=3) and to 8.21±0.23μM (r(2)=0.9887; n=3). Excellent agreement was found between the results obtained by CE and those reported in literature which validates the developed method. Particularly, the CE-based assay is able to rank HNE inhibitors relative to each other. Furthermore, MST technique was used for evaluating HNE interaction with the ursolic acid. Up to 16 capillaries were automatically processed to obtain in one titration experiment the dissociation constant for the HNE-ursolic acid complex. Ki was found to be 2.72±0.66μM (n=3) which is in excellent agreement with the value determined by CE enzyme inhibition studies (Ki=2.81μM) confirming the reliability of the developed CE assay and the competitive inhibition mode of ursolic acid.
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Affiliation(s)
- Fayad Syntia
- Institut de Chimie Organique et Analytique, Université d'Orléans, CNRS FR 2708, UMR 7311, Orléans, France
| | - Reine Nehmé
- Institut de Chimie Organique et Analytique, Université d'Orléans, CNRS FR 2708, UMR 7311, Orléans, France.
| | - Bérengère Claude
- Institut de Chimie Organique et Analytique, Université d'Orléans, CNRS FR 2708, UMR 7311, Orléans, France
| | - Philippe Morin
- Institut de Chimie Organique et Analytique, Université d'Orléans, CNRS FR 2708, UMR 7311, Orléans, France
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Edwards JV, Prevost NT, French AD, Concha M, Condon BD. Kinetic and structural analysis of fluorescent peptides on cotton cellulose nanocrystals as elastase sensors. Carbohydr Polym 2015; 116:278-85. [DOI: 10.1016/j.carbpol.2014.04.067] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Revised: 04/18/2014] [Accepted: 04/20/2014] [Indexed: 11/26/2022]
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Kakizaki I, Koizumi H, Chen F, Endo M. Inhibitory effect of chondroitin sulfate oligosaccharides on bovine testicular hyaluronidase. Carbohydr Polym 2014; 121:362-71. [PMID: 25659711 DOI: 10.1016/j.carbpol.2014.11.071] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 11/21/2014] [Accepted: 11/29/2014] [Indexed: 11/26/2022]
Abstract
Hyaluronan and chondroitin sulfates are prominent components of the extracellular matrices of animal tissues; however, their functions in relation to their oligosaccharide structures have not yet been fully elucidated. The oligosaccharides of hyaluronan and chondroitin sulfate were prepared and used to investigate their effects on the hydrolysis and transglycosylation reactions of bovine testicular hyaluronidase when hyaluronan was used as a substrate. Hydrolysis and transglycosylation activities were assessed in independent reaction systems by analyzing the products by HPLC. The hydrolysis and transglycosylation reactions of bovine testicular hyaluronidase were dose-dependently inhibited by chondroitin sulfate oligosaccharides, but not by hyaluronan or chondroitin oligosaccharides. A kinetic analysis of the hydrolysis reaction using hyaluronan octasaccharide revealed that the inhibition mode by chondroitin sulfate oligosaccharides was competitive.
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Affiliation(s)
- Ikuko Kakizaki
- Department of Glycotechnology, Center for Advanced Medical Research, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki 036-8562, Japan; Department of Glycobiochemistry, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki 036-8562, Japan.
| | - Hideyo Koizumi
- Department of Glycotechnology, Center for Advanced Medical Research, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki 036-8562, Japan
| | - Fengchao Chen
- Department of Glycotechnology, Center for Advanced Medical Research, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki 036-8562, Japan
| | - Masahiko Endo
- Department of Glycobiochemistry, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki 036-8562, Japan
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Iliás A, Liliom K, Greiderer-Kleinlercher B, Reitinger S, Lepperdinger G. Unbinding of hyaluronan accelerates the enzymatic activity of bee hyaluronidase. J Biol Chem 2011; 286:35699-35707. [PMID: 21840987 DOI: 10.1074/jbc.m111.263731] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Hyaluronan (HA), a polymeric glycosaminoglycan ubiquitously present in higher animals, is hydrolyzed by hyaluronidases (HAases). Here, we used bee HAase as a model enzyme to study the HA-HAase interaction. Located in close proximity to the active center, a bulky surface loop, which appears to obstruct one end of the substrate binding groove, was found to be functionally involved in HA turnover. To better understand kinetic changes in substrate interaction, binding of high molecular weight HA to catalytically inactive HAase was monitored by means of quartz crystal microbalance technology. Replacement of the delimiting loop by a tetrapeptide interconnection increased the affinity for HA up to 100-fold, with a K(D) below 1 nm being the highest affinity among HA-binding proteins surveyed so far. The experimental data of HA-HAase interaction were further validated showing best fit to the theoretically proposed sequential two-site model. Besides the one, which had been shown previously in course of x-ray structure determination, a previously unrecognized binding site works in conjunction with an unbinding loop that facilitates liberation of hydrolyzed HA.
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Affiliation(s)
- Attila Iliás
- Extracellular Matrix Research, Institute for Biomedical Aging Research, Austrian Academy of Sciences, A-6020 Innsbruck, Austria
| | - Károly Liliom
- Institute of Enzymology, Biological Research Center, Hungarian Academy of Sciences, H-1518 Budapest, Hungary
| | - Brigitte Greiderer-Kleinlercher
- Extracellular Matrix Research, Institute for Biomedical Aging Research, Austrian Academy of Sciences, A-6020 Innsbruck, Austria
| | - Stephan Reitinger
- Extracellular Matrix Research, Institute for Biomedical Aging Research, Austrian Academy of Sciences, A-6020 Innsbruck, Austria
| | - Günter Lepperdinger
- Extracellular Matrix Research, Institute for Biomedical Aging Research, Austrian Academy of Sciences, A-6020 Innsbruck, Austria.
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Muschin T, Han S, Ishimura H, Yoshida T. Sulfated Polysaccharides as Specific Biologically Active Materials. TRENDS GLYCOSCI GLYC 2011. [DOI: 10.4052/tigg.23.292] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Ghosh P, Wu J, Shimmon S, Zannettino AC, Gronthos S, Itescu S. Pentosan polysulfate promotes proliferation and chondrogenic differentiation of adult human bone marrow-derived mesenchymal precursor cells. Arthritis Res Ther 2010; 12:R28. [PMID: 20167057 PMCID: PMC2875662 DOI: 10.1186/ar2935] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2009] [Revised: 12/11/2009] [Accepted: 02/18/2010] [Indexed: 12/28/2022] Open
Abstract
INTRODUCTION This study was undertaken to determine whether the anti-osteoarthritis drug pentosan polysulfate (PPS) influenced mesenchymal precursor cell (MPC) proliferation and differentiation. METHODS Human MPCs were maintained in monolayer, pellet or micromass cultures (MMC) for up to 10 days with PPS at concentrations of 0 to 20 microg/ml. MPC viability and proliferation was assessed using the WST-1 assay and 3H-thymidine incorporation into DNA, while apoptosis was monitored by flow cytometry. Proteoglycan (PG) biosynthesis was determined by 35SO42- incorporation and staining with Alcian blue. Proteoglycan and collagen type I and collagen type II deposition in pellet cultures was also examined by Toluidine blue and immunohistochemical staining, respectively. The production of hyaluronan (HA) by MPCs in MMC was assessed by ELISA. The relative outcome of PPS, HA, heparin or dextran sulfate (DS) on PG synthesis was compared in 5-day MMC. Gene expression of MPCs in 7-day and 10-day MMC was examined using real-time PCR. MPC differentiation was investigated by co-culturing with PPS in osteogenic or adipogenic inductive culture media for 28 days. RESULTS Significant MPC proliferation was evident by day 3 at PPS concentrations of 1 to 5 microg/ml (P < 0.01). In the presence of 1 to 10 microg/ml PPS, a 38% reduction in IL-4/IFNgamma-induced MPC apoptosis was observed. In 5-day MMC, 130% stimulation of PG synthesis occurred at 2.5 microg/ml PPS (P < 0.0001), while 5.0 microg/ml PPS achieved maximal stimulation in the 7-day and 10-day cultures (P < 0.05). HA and DS at > or = 5 microg/ml inhibited PG synthesis (P < 0.05) in 5-day MMC. Collagen type II deposition by MMC was significant at > or = 0.5 microg/ml PPS (P < 0.001 to 0.05). In MPC-PPS pellet cultures, more PG, collagen type II but less collagen type I was deposited than in controls. Real-time PCR results were consistent with the protein data. At 5 and 10 microg/ml PPS, MPC osteogenic differentiation was suppressed (P < 0.01). CONCLUSIONS This is the first study to demonstrate that PPS promotes MPC proliferation and chondrogenesis, offering new strategies for cartilage regeneration and repair in osteoarthritic joints.
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Affiliation(s)
- Peter Ghosh
- Proteobioactives Pty Ltd, 27/9 Powells Road, Brookvale, New South Wales 2100, Australia.
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Hintze V, Moeller S, Schnabelrauch M, Bierbaum S, Viola M, Worch H, Scharnweber D. Modifications of Hyaluronan Influence the Interaction with Human Bone Morphogenetic Protein-4 (hBMP-4). Biomacromolecules 2009; 10:3290-7. [DOI: 10.1021/bm9008827] [Citation(s) in RCA: 116] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vera Hintze
- Institute of Material Science, Max Bergmann Center of Biomaterials, Technische Universität Dresden, 01069 Dresden, Germany, Biomaterials Department, INNOVENT e.V., 07745 Jena, Germany, and Department of Experimental and Clinical Biomedical Sciences, Università dell’Insubria, 21100 Varese, Italy
| | - Stephanie Moeller
- Institute of Material Science, Max Bergmann Center of Biomaterials, Technische Universität Dresden, 01069 Dresden, Germany, Biomaterials Department, INNOVENT e.V., 07745 Jena, Germany, and Department of Experimental and Clinical Biomedical Sciences, Università dell’Insubria, 21100 Varese, Italy
| | - Matthias Schnabelrauch
- Institute of Material Science, Max Bergmann Center of Biomaterials, Technische Universität Dresden, 01069 Dresden, Germany, Biomaterials Department, INNOVENT e.V., 07745 Jena, Germany, and Department of Experimental and Clinical Biomedical Sciences, Università dell’Insubria, 21100 Varese, Italy
| | - Susanne Bierbaum
- Institute of Material Science, Max Bergmann Center of Biomaterials, Technische Universität Dresden, 01069 Dresden, Germany, Biomaterials Department, INNOVENT e.V., 07745 Jena, Germany, and Department of Experimental and Clinical Biomedical Sciences, Università dell’Insubria, 21100 Varese, Italy
| | - Manuela Viola
- Institute of Material Science, Max Bergmann Center of Biomaterials, Technische Universität Dresden, 01069 Dresden, Germany, Biomaterials Department, INNOVENT e.V., 07745 Jena, Germany, and Department of Experimental and Clinical Biomedical Sciences, Università dell’Insubria, 21100 Varese, Italy
| | - Hartmut Worch
- Institute of Material Science, Max Bergmann Center of Biomaterials, Technische Universität Dresden, 01069 Dresden, Germany, Biomaterials Department, INNOVENT e.V., 07745 Jena, Germany, and Department of Experimental and Clinical Biomedical Sciences, Università dell’Insubria, 21100 Varese, Italy
| | - Dieter Scharnweber
- Institute of Material Science, Max Bergmann Center of Biomaterials, Technische Universität Dresden, 01069 Dresden, Germany, Biomaterials Department, INNOVENT e.V., 07745 Jena, Germany, and Department of Experimental and Clinical Biomedical Sciences, Università dell’Insubria, 21100 Varese, Italy
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Zucker S, Schmidt CE, Dufour A, Kaplan RC, Park HI, Jiang W. ProMMP-2: TIMP-1 complexes identified in plasma of healthy individuals. Connect Tissue Res 2009; 50:223-31. [PMID: 19637058 PMCID: PMC3286656 DOI: 10.1080/03008200802626970] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Activation of MMPs in tissues is an important component of tissue injury. Based on earlier reports that (latent) proMMP-2 is incapable of forming a complex with TIMP-1, we reasoned that the identification of MMP-2:TIMP-1 complexes in blood might serve as a surrogate marker ("smoking gun") of MMP-2 activation in tissues. Using specific antibodies, we developed a sensitive and specific assay to detect MMP-2:TIMP-1 complexes. We were perplexed to find that approximate 40% of plasma specimens from healthy individuals had detectable levels of the MMP-2:TIMP-1 complexes. Employing recombinant TIMP-1 bound Sepharose beads and Western blots, we demonstrated binding between recombinant proMMP-2 and TIMP-1 proteins. Recombinant MMP-2 lacking the catalytic domain also bound to TIMP-1 coated beads. These data are consistent with TIMP-1 binding to the hemopexin or hinge domain of proMMP-2. The explanation for the presence of plasma proMMP-2:TIMP-1 complexes in selected healthy individuals remains to be determined. In contrast to our immunoassay and bead-binding experiments, proMMP-2 failed to bind to immobilized TIMP-1 employing surface plasmon resonance technology. Additional studies are needed to clarify these contrasting results.
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Affiliation(s)
- Stanley Zucker
- Department of Research, Veterans Affairs Medical Center, Northport, New York 11768, USA.
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Beattie J, Phillips K, Shand JH, Szymanowska M, Flint DJ, Allan GJ. Molecular interactions in the insulin-like growth factor (IGF) axis: a surface plasmon resonance (SPR) based biosensor study. Mol Cell Biochem 2007; 307:221-36. [PMID: 17899320 DOI: 10.1007/s11010-007-9601-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2007] [Accepted: 08/24/2007] [Indexed: 12/18/2022]
Abstract
This review describes a comprehensive analysis of a surface plasmon resonance (SPR)-based biosensor study of molecular interactions in the insulin-like growth factor (IGF) molecular axis. In this study, we focus on the interaction between the polypeptide growth factors IGF-I and IGF-II with six soluble IGF binding proteins (IGFBP 1-6), which occur naturally in various biological fluids. We have describe the conditions required for the accurate determination of kinetic rate constants for these interactions and highlight the experimental and theoretical pitfalls, which may be encountered in the early stages of such a study. We focus on IGFBP-5 and describe a site-directed mutagenesis study, which examines the contribution of various residues in the protein to high affinity interaction with IGF-I and -II. We analyse the interaction of IGFBP-5 (and IGFBP-3) with heparin and other biomolecules and describe experiments, which were designed to monitor multi-protein complex formation in this molecular axis.
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Affiliation(s)
- James Beattie
- Strathclyde Institute of Pharmacy & Biomedical Science, Royal College Building, University of Strathclyde, Glasgow, UK.
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Solanki PR, Arya SK, Nishimura Y, Iwamoto M, Malhotra BD. Cholesterol biosensor based on amino-undecanethiol self-assembled monolayer using surface plasmon resonance technique. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:7398-403. [PMID: 17523688 DOI: 10.1021/la700350x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Cholesterol oxidase has been covalently immobilized onto 11-amino-1-undecanethiol hydrochloride (AUT) self-assembled monolayer (SAM) fabricated on gold (Au) substrates using glutaraldehyde as a cross-linker. These ChOx/AUT/Au bioelectrodes characterized using contact angle (CA) measurements; electrochemical technique and atomic force microscopy (AFM) have been utilized for the estimation of cholesterol in solution using the surface plasmon resonance (SPR) technique. These biosensing electrodes exhibiting linearity from 50 to 500 mg/dL of cholesterol in solution and sensitivity of 1.23 m0/(mg dL), can be used more than 20 times and have a shelf life of about 10 weeks when stored at 4 degrees C.
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Affiliation(s)
- Pratima R Solanki
- Biomolecular Electronics and Conducting Polymer Research Group, National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi-110012, India
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Marquis J, Paillard L, Audic Y, Cosson B, Danos O, Le Bec C, Osborne H. CUG-BP1/CELF1 requires UGU-rich sequences for high-affinity binding. Biochem J 2006; 400:291-301. [PMID: 16938098 PMCID: PMC1652823 DOI: 10.1042/bj20060490] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
CUG-BP1 [CUG-binding protein 1 also called CELF (CUG-BP1 and ETR3 like factors) 1] is a human RNA-binding protein that has been implicated in the control of splicing and mRNA translation. The Xenopus homologue [EDEN-BP (embryo deadenylation element-binding protein)] is required for rapid deadenylation of certain maternal mRNAs just after fertilization. A variety of sequence elements have been described as target sites for these two proteins but their binding specificity is still controversial. Using a SELEX (systematic evolution of ligand by exponential enrichment) procedure and recombinant CUG-BP1 we selected two families of aptamers. Surface plasmon resonance and electrophoretic mobility-shift assays showed that these two families differed in their ability to bind CUG-BP1. Furthermore, the selected high-affinity aptamers form two complexes with CUG-BP1 in electrophoretic mobility assays whereas those that bind with low affinity only form one complex. The validity of the distinction between the two families of aptamers was confirmed by a functional in vivo deadenylation assay. Only those aptamers that bound CUG-BP1 with high affinity conferred deadenylation on a reporter mRNA. These high-affinity RNAs are characterized by a richness in UGU motifs. Using these binding site characteristics we identified the Xenopus maternal mRNA encoding the MAPK (mitogen-activated protein kinase) phosphatase (XCl100alpha) as a substrate for EDEN-BP. In conclusion, high-affinity CUG-BP1 binding sites are sequence elements at least 30 nucleotides in length that are enriched in combinations of U and G nucleotides and contain at least 4 UGU trinucleotide motifs. Such sequence elements are functionally competent to target an RNA for deadenylation in vivo.
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Affiliation(s)
- Julien Marquis
- *Généthon, CNRS UMR 8115, 1 bis rue de l'Internationale 91002 Evry cedex 2, France
| | - Luc Paillard
- †CNRS UMR 6061, Génétique et Développement, IFR 140 GFAS, Université de Rennes 1, Faculté de Médecine, 2 Avenue Léon Bernard, CS 34317, 35043 Rennes Cedex, France
| | - Yann Audic
- †CNRS UMR 6061, Génétique et Développement, IFR 140 GFAS, Université de Rennes 1, Faculté de Médecine, 2 Avenue Léon Bernard, CS 34317, 35043 Rennes Cedex, France
| | - Bertrand Cosson
- †CNRS UMR 6061, Génétique et Développement, IFR 140 GFAS, Université de Rennes 1, Faculté de Médecine, 2 Avenue Léon Bernard, CS 34317, 35043 Rennes Cedex, France
| | - Olivier Danos
- *Généthon, CNRS UMR 8115, 1 bis rue de l'Internationale 91002 Evry cedex 2, France
| | - Christine Le Bec
- *Généthon, CNRS UMR 8115, 1 bis rue de l'Internationale 91002 Evry cedex 2, France
| | - H. Beverley Osborne
- †CNRS UMR 6061, Génétique et Développement, IFR 140 GFAS, Université de Rennes 1, Faculté de Médecine, 2 Avenue Léon Bernard, CS 34317, 35043 Rennes Cedex, France
- To whom correspondence should be addressed (email )
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Abstract
Protein adsorption onto metal oxide surfaces is an essential aspect of the cascade of biological reactions taking place at all interfaces between implanted materials and the biological environment. The types and amounts of adsorbed proteins mediate subsequent adhesion, proliferation and differentiation of cells. Protein adsorption to surfaces of metal oxides and their kinetics are important in the formation and growth of seashells, one of the toughest natural ceramics, in modern bio-analytical devices as well as in bone and teeth implant technology. This paper describes results obtained in a feasibility study of how to use metal-oxide particles to obtain biosensors with a high turnover. The most important features of proteins are outlined describing them as purpose-built "polymers" from amino acids with specific conformations. Some key aspects of Metaloxide (MeO) surfaces in water and the influence of electrostatic and hydrophobic interaction on protein adsorption are reported. Results concerning the interaction between different proteins and MeO surfaces in water are discussed in detail. Examples of purely electrostatic interactions of proteins with MeO surfaces as well as the influence of hydrophobic interaction are elucidated. An outlook of the implications of the new insights on natural and synthetic materials will be given concerning bio-compatibility, bio-mineralization and self assembly of materials.
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16
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Affiliation(s)
- Raz Jelinek
- Department of Chemistry and Staedler Minerva Center for Mesoscopic Macromolecular Engineering, Ben Gurion University of the Negev, Beersheva 84105, Israel.
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Okumura A, Sato Y, Kyo M, Kawaguchi H. Point mutation detection with the sandwich method employing hydrogel nanospheres by the surface plasmon resonance imaging technique. Anal Biochem 2005; 339:328-37. [PMID: 15797574 DOI: 10.1016/j.ab.2005.01.017] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2004] [Indexed: 11/27/2022]
Abstract
We propose a surface modification procedure to construct DNA arrays for use in surface plasmon resonance (SPR) imaging studies for the highly sensitive detection of a K-ras point mutation, enhanced with hydrogel nanospheres. A homobifunctional alkane dithiol was adsorbed on Au film to obtain the thiol surface, and ethyleneglycol diglycidylether (EGDE) was reacted to insert the ethyleneglycol moiety, which can suppress nonspecific adsorption during SPR analysis. Then streptavidin (SA) was immobilized on EGDE using tosyl chloride activation. Biotinylated DNA ligands were bound to the SA surface via biotin-SA interaction to fabricate DNA arrays. In SPR analysis, the DNA analyte was exposed on the DNA array and hybridized with the immobilized DNA probes. Subsequently, the hydrogel nanospheres conjugated with DNA probes were bound to the DNA analytes in a sandwich configuration. The DNA-carrying nanospheres led to SPR signal enhancement and enabled us to discriminate a K-ras point mutation in the SPR difference image. The application of DNA-carrying hydrogel nanospheres for SPR imaging assays was a promising technique for high throughput and precise detection of point mutations.
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Affiliation(s)
- Aya Okumura
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
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Abstract
In the year 2003 there was a 17% increase in the number of publications citing work performed using optical biosensor technology compared with the previous year. We collated the 962 total papers for 2003, identified the geographical regions where the work was performed, highlighted the instrument types on which it was carried out, and segregated the papers by biological system. In this overview, we spotlight 13 papers that should be on everyone's 'must read' list for 2003 and provide examples of how to identify and interpret high-quality biosensor data. Although we still find that the literature is replete with poorly performed experiments, over-interpreted results and a general lack of understanding of data analysis, we are optimistic that these shortcomings will be addressed as biosensor technology continues to mature.
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Affiliation(s)
- Rebecca L Rich
- Center for Biomolecular Interaction Analysis, University of Utah, Salt Lake City, UT 84132, USA
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Rezwan K, Meier LP, Rezwan M, Vörös J, Textor M, Gauckler LJ. Bovine serum albumin adsorption onto colloidal Al2O3 particles: a new model based on zeta potential and UV-vis measurements. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:10055-10061. [PMID: 15518493 DOI: 10.1021/la048459k] [Citation(s) in RCA: 217] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We investigated the adsorption of bovine serum albumin (BSA) on colloidal Al2O3 particles in an aqueous environment. Changes in the zeta potential of the Al2O3 particles upon the adsorption of BSA were measured using an electro-acoustic technique. The mass of protein adsorbed was determined by using UV-vis spectroscopy. The change of the isoelectric point of the Al2O3 powder-protein suspension was found to be a function of adsorbed protein mass. It was shown that approximately one monolayer of BSA was needed to fully mask the surface and to compromise the charge of Al2O3. From titration experiments it follows that about 30-36% of the negatively charged groups of the protein form bonds with the protonated and charged Al2O3 surface. On the basis of our observations we introduced a new adsorption model for BSA on Al2O3 particles.
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Affiliation(s)
- Kurosch Rezwan
- Nonmetallic Inorganic Materials, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich.
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