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Semak V, Eichhorn T, Weiss R, Weber V. Polyzwitterionic Coating of Porous Adsorbents for Therapeutic Apheresis. J Funct Biomater 2022; 13:jfb13040216. [PMID: 36412857 PMCID: PMC9680258 DOI: 10.3390/jfb13040216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 10/27/2022] [Accepted: 10/28/2022] [Indexed: 11/06/2022] Open
Abstract
Adsorbents for whole blood apheresis need to be highly blood compatible to minimize the activation of blood cells on the biomaterial surface. Here, we developed blood-compatible matrices by surface modification with polyzwitterionic polysulfobetainic and polycarboxybetainic coatings. Photoreactive zwitterionic terpolymers were synthesized by free-radical polymerization of zwitterionic, photoreactive, and fluorescent monomers. Upon UV irradiation, the terpolymers were photodeposited and mutually crosslinked on the surface of hydrophobic polystyrene-co-divinylbenzene and hydrophilic polyacrylamide-co-polyacrylate (DALI) beads. Fluorescent microscopy revealed coatings with an average thickness of 5 µm, which were limited to the bead surface. Blood compatibility was assessed based on polymer-induced hemolysis, coagulation parameters, and in vitro tests. The maintenance of the adsorption capacity after coating was studied in human whole blood with cytokines for polystyrene beads (remained capacity 25-67%) and with low-density lipoprotein (remained capacity 80%) for polyacrylate beads. Coating enhanced the blood compatibility of hydrophobic, but not of hydrophilic adsorbents. The most prominent effect was observed on coagulation parameters (e.g., PT, aPTT, TT, and protein C) and neutrophil count. Polycarboxybetaine with a charge spacer of five carbons was the most promising polyzwitterion for the coating of adsorbents for whole blood apheresis.
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Ebeyer-Masotta M, Eichhorn T, Weiss R, Semak V, Lauková L, Fischer MB, Weber V. Heparin-Functionalized Adsorbents Eliminate Central Effectors of Immunothrombosis, including Platelet Factor 4, High-Mobility Group Box 1 Protein and Histones. Int J Mol Sci 2022; 23:ijms23031823. [PMID: 35163743 PMCID: PMC8836755 DOI: 10.3390/ijms23031823] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 01/31/2022] [Accepted: 02/01/2022] [Indexed: 12/20/2022] Open
Abstract
Inflammation and thrombosis are closely intertwined in numerous disorders, including ischemic events and sepsis, as well as coronavirus disease 2019 (COVID-19). Thrombotic complications are markers of disease severity in both sepsis and COVID-19 and are associated with multiorgan failure and increased mortality. Immunothrombosis is driven by the complement/tissue factor/neutrophil axis, as well as by activated platelets, which can trigger the release of neutrophil extracellular traps (NETs) and release further effectors of immunothrombosis, including platelet factor 4 (PF4/CXCL4) and high-mobility box 1 protein (HMGB1). Many of the central effectors of deregulated immunothrombosis, including activated platelets and platelet-derived extracellular vesicles (pEVs) expressing PF4, soluble PF4, HMGB1, histones, as well as histone-decorated NETs, are positively charged and thus bind to heparin. Here, we provide evidence that adsorbents functionalized with endpoint-attached heparin efficiently deplete activated platelets, pEVs, PF4, HMGB1 and histones/nucleosomes. We propose that this elimination of central effectors of immunothrombosis, rather than direct binding of pathogens, could be of clinical relevance for mitigating thrombotic complications in sepsis or COVID-19 using heparin-functionalized adsorbents.
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Affiliation(s)
- Marie Ebeyer-Masotta
- Center for Biomedical Technology, Department for Biomedical Research, Danube University Krems, 3500 Krems, Austria; (M.E.-M.); (T.E.); (R.W.); (V.S.); (L.L.); (M.B.F.)
| | - Tanja Eichhorn
- Center for Biomedical Technology, Department for Biomedical Research, Danube University Krems, 3500 Krems, Austria; (M.E.-M.); (T.E.); (R.W.); (V.S.); (L.L.); (M.B.F.)
| | - René Weiss
- Center for Biomedical Technology, Department for Biomedical Research, Danube University Krems, 3500 Krems, Austria; (M.E.-M.); (T.E.); (R.W.); (V.S.); (L.L.); (M.B.F.)
| | - Vladislav Semak
- Center for Biomedical Technology, Department for Biomedical Research, Danube University Krems, 3500 Krems, Austria; (M.E.-M.); (T.E.); (R.W.); (V.S.); (L.L.); (M.B.F.)
| | - Lucia Lauková
- Center for Biomedical Technology, Department for Biomedical Research, Danube University Krems, 3500 Krems, Austria; (M.E.-M.); (T.E.); (R.W.); (V.S.); (L.L.); (M.B.F.)
| | - Michael B. Fischer
- Center for Biomedical Technology, Department for Biomedical Research, Danube University Krems, 3500 Krems, Austria; (M.E.-M.); (T.E.); (R.W.); (V.S.); (L.L.); (M.B.F.)
- Clinic for Blood Group Serology and Transfusion Medicine, Medical University of Vienna, 1090 Vienna, Austria
| | - Viktoria Weber
- Center for Biomedical Technology, Department for Biomedical Research, Danube University Krems, 3500 Krems, Austria; (M.E.-M.); (T.E.); (R.W.); (V.S.); (L.L.); (M.B.F.)
- Correspondence: ; Tel.: +43-2732-893-2601
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George SK, Lauková L, Weiss R, Semak V, Fendl B, Weiss VU, Steinberger S, Allmaier G, Tripisciano C, Weber V. Comparative Analysis of Platelet-Derived Extracellular Vesicles Using Flow Cytometry and Nanoparticle Tracking Analysis. Int J Mol Sci 2021; 22:ijms22083839. [PMID: 33917210 PMCID: PMC8068037 DOI: 10.3390/ijms22083839] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 04/01/2021] [Accepted: 04/03/2021] [Indexed: 01/08/2023] Open
Abstract
Growing interest in extracellular vesicles (EVs) has prompted the advancements of protocols for improved EV characterization. As a high-throughput, multi-parameter, and single particle technique, flow cytometry is widely used for EV characterization. The comparison of data on EV concentration, however, is hindered by the lack of standardization between different protocols and instruments. Here, we quantified EV counts of platelet-derived EVs, using two flow cytometers (Gallios and CytoFLEX LX) and nanoparticle tracking analysis (NTA). Phosphatidylserine-exposing EVs were identified by labelling with lactadherin (LA). Calibration with silica-based fluorescent beads showed detection limits of 300 nm and 150 nm for Gallios and CytoFLEX LX, respectively. Accordingly, CytoFLEX LX yielded 40-fold higher EV counts and 13-fold higher counts of LA+CD41+ EVs compared to Gallios. NTA in fluorescence mode (F-NTA) demonstrated that only 9.5% of all vesicles detected in scatter mode exposed phosphatidylserine, resulting in good agreement of LA+ EVs for CytoFLEX LX and F-NTA. Since certain functional characteristics, such as the exposure of pro-coagulant phosphatidylserine, are not equally displayed across the entire EV size range, our study highlights the necessity of indicating the size range of EVs detected with a given approach along with the EV concentration to support the comparability between different studies.
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Affiliation(s)
- Sobha Karuthedom George
- Center for Biomedical Technology, Department for Biomedical Research, Danube University Krems, 3500 Krems, Austria; (S.K.G.); (L.L.); (R.W.); (V.S.); (B.F.); (C.T.)
| | - Lucia Lauková
- Center for Biomedical Technology, Department for Biomedical Research, Danube University Krems, 3500 Krems, Austria; (S.K.G.); (L.L.); (R.W.); (V.S.); (B.F.); (C.T.)
| | - René Weiss
- Center for Biomedical Technology, Department for Biomedical Research, Danube University Krems, 3500 Krems, Austria; (S.K.G.); (L.L.); (R.W.); (V.S.); (B.F.); (C.T.)
| | - Vladislav Semak
- Center for Biomedical Technology, Department for Biomedical Research, Danube University Krems, 3500 Krems, Austria; (S.K.G.); (L.L.); (R.W.); (V.S.); (B.F.); (C.T.)
| | - Birgit Fendl
- Center for Biomedical Technology, Department for Biomedical Research, Danube University Krems, 3500 Krems, Austria; (S.K.G.); (L.L.); (R.W.); (V.S.); (B.F.); (C.T.)
| | - Victor U. Weiss
- Institute of Chemical Technologies and Analytics, TU Wien, 1060 Vienna, Austria; (V.U.W.); (S.S.); (G.A.)
| | - Stephanie Steinberger
- Institute of Chemical Technologies and Analytics, TU Wien, 1060 Vienna, Austria; (V.U.W.); (S.S.); (G.A.)
| | - Günter Allmaier
- Institute of Chemical Technologies and Analytics, TU Wien, 1060 Vienna, Austria; (V.U.W.); (S.S.); (G.A.)
| | - Carla Tripisciano
- Center for Biomedical Technology, Department for Biomedical Research, Danube University Krems, 3500 Krems, Austria; (S.K.G.); (L.L.); (R.W.); (V.S.); (B.F.); (C.T.)
| | - Viktoria Weber
- Center for Biomedical Technology, Department for Biomedical Research, Danube University Krems, 3500 Krems, Austria; (S.K.G.); (L.L.); (R.W.); (V.S.); (B.F.); (C.T.)
- Correspondence: ; Tel.: +43-2732-893-2632
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Abstract
Background: Lipoprotein apheresis is an important therapeutic option in
homozygous familial hypercholesterolemia, progressive
atherosclerosis, or when depletion of lipoprotein(a) is
indicated. It is generally regarded as safe, but drops in
platelet counts as well as sporadic episodes of thrombocytopenia
have been reported. We assessed the influence of platelet
desialylation, which may be induced by endogenous or
pathogen-derived neuraminidases, on platelet adhesion to
polyacrylate-based adsorbents for whole blood lipoprotein
apheresis. Methods: Medical grade platelet concentrates were incubated with
neuraminidase in vitro and were circulated over adsorbent
columns downscaled from clinical application. Results: Cleavage of terminal sialic residues resulted in platelet
activation with significantly elevated expression of platelet
factor 4 (PF4) and in enhanced platelet adhesion to the
adsorbent, accompanied by a pronounced drop in platelet counts
in the column flow-through. Conclusion: Alterations in endogenous neuraminidase activity or exogenous
(pathogen-derived) neuraminidase may trigger enhanced platelet
adhesion in whole blood lipoprotein apheresis.
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Affiliation(s)
- Lucia Lauková
- Department for Biomedical
Research, Center for Biomedical Technology, Danube University Krems, Krems,
Austria
| | - René Weiss
- Department for Biomedical
Research, Christian Doppler Laboratory for Innovative Therapy Approaches in
Sepsis, Danube University Krems, Krems, Austria
| | - Vladislav Semak
- Department for Biomedical
Research, Center for Biomedical Technology, Danube University Krems, Krems,
Austria
| | - Viktoria Weber
- Department for Biomedical
Research, Christian Doppler Laboratory for Innovative Therapy Approaches in
Sepsis, Danube University Krems, Krems, Austria
- Viktoria Weber, Department for
Biomedical Research, Christian Doppler Laboratory for Innovative
Therapy Approaches in Sepsis, Danube University Krems, Dr. Karl
Dorrek-Straße 30, Krems 3500, Austria.
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Hrobárik P, Hrobáriková V, Semak V, Kasák P, Rakovský E, Polyzos I, Fakis M, Persephonis P. Quadrupolar Benzobisthiazole-Cored Arylamines as Highly Efficient Two-Photon Absorbing Fluorophores. Org Lett 2014; 16:6358-61. [DOI: 10.1021/ol503137p] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Peter Hrobárik
- Institute
of Chemistry, Technical University of Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany
| | - Veronika Hrobáriková
- Institute
of Chemistry, Technical University of Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany
| | - Vladislav Semak
- Institute
of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
- Polymer
Institute, Slovak Academy of Sciences, Dúbravská cesta 9, SK-84541 Bratislava, Slovakia
| | - Peter Kasák
- Center
for Advanced Materials, Qatar University, P.O. Box 2713, Doha, Qatar
| | - Erik Rakovský
- Department
of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, SK-84215 Bratislava, Slovakia
| | - Ioannis Polyzos
- Department
of Physics, University of Patras, GR-26504 Patras, Greece
| | - Mihalis Fakis
- Department
of Physics, University of Patras, GR-26504 Patras, Greece
| | - Peter Persephonis
- Department
of Physics, University of Patras, GR-26504 Patras, Greece
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Lacík I, Stach M, Kasák P, Semak V, Uhelská L, Chovancová A, Reinhold G, Kilz P, Delaittre G, Charleux B, Chaduc I, D'Agosto F, Lansalot M, Gaborieau M, Castignolles P, Gilbert RG, Szablan Z, Barner-Kowollik C, Hesse P, Buback M. SEC Analysis of Poly(Acrylic Acid) and Poly(Methacrylic Acid). MACROMOL CHEM PHYS 2014. [DOI: 10.1002/macp.201400339] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Igor Lacík
- Polymer Institute of the Slovak Academy of Sciences; Dúbravska cesta 9 845 41 Bratislava 45 Slovakia
| | - Marek Stach
- Polymer Institute of the Slovak Academy of Sciences; Dúbravska cesta 9 845 41 Bratislava 45 Slovakia
| | - Peter Kasák
- Polymer Institute of the Slovak Academy of Sciences; Dúbravska cesta 9 845 41 Bratislava 45 Slovakia
| | - Vladislav Semak
- Polymer Institute of the Slovak Academy of Sciences; Dúbravska cesta 9 845 41 Bratislava 45 Slovakia
| | - Lucia Uhelská
- Polymer Institute of the Slovak Academy of Sciences; Dúbravska cesta 9 845 41 Bratislava 45 Slovakia
| | - Anna Chovancová
- Polymer Institute of the Slovak Academy of Sciences; Dúbravska cesta 9 845 41 Bratislava 45 Slovakia
| | - Günter Reinhold
- PSS Polymer Standards Service GmbH; In der Dalheimer Wiese 5 D-55120 Mainz Germany
| | - Peter Kilz
- PSS Polymer Standards Service GmbH; In der Dalheimer Wiese 5 D-55120 Mainz Germany
| | - Guillaume Delaittre
- UPMC Univ. Paris 6, Sorbonne Universités and CNRS; Laboratoire de Chimie des Polymères, UMR 7610; 3 rue Galilée 94200 Ivry France
| | - Bernadette Charleux
- UPMC Univ. Paris 6, Sorbonne Universités and CNRS; Laboratoire de Chimie des Polymères, UMR 7610; 3 rue Galilée 94200 Ivry France
| | - Isabelle Chaduc
- Université de Lyon, Univ Lyon 1, CPE Lyon, CNRS, UMR 5265, C2P2 (Chemistry, Catalysis, Polymers and Processes), Team LCPP; Bat 308F, 43 Bd du 11 Novembre 1918, BP 2077 69616 Villeurbanne France
| | - Franck D'Agosto
- Université de Lyon, Univ Lyon 1, CPE Lyon, CNRS, UMR 5265, C2P2 (Chemistry, Catalysis, Polymers and Processes), Team LCPP; Bat 308F, 43 Bd du 11 Novembre 1918, BP 2077 69616 Villeurbanne France
| | - Muriel Lansalot
- Université de Lyon, Univ Lyon 1, CPE Lyon, CNRS, UMR 5265, C2P2 (Chemistry, Catalysis, Polymers and Processes), Team LCPP; Bat 308F, 43 Bd du 11 Novembre 1918, BP 2077 69616 Villeurbanne France
| | - Marianne Gaborieau
- University of Sydney; School of Chemistry; Key Centre for Polymers and Colloids; Sydney NSW 2006 Australia
- University of Western Sydney; School of Science and Health; Australian Centre for Research on Separation Science; Molecular Medicine Research Group; Locked Bag 1797 Penrith NSW 2751 Australia
| | - Patrice Castignolles
- University of Sydney; School of Chemistry; Key Centre for Polymers and Colloids; Sydney NSW 2006 Australia
- University of Western Sydney; School of Science and Health; Australian Centre for Research on Separation Science; Molecular Medicine Research Group; Locked Bag 1797 Penrith NSW 2751 Australia
| | - Robert G. Gilbert
- The University of Queensland; Centre for Nutrition and Food Sciences; Queensland Alliance for Agriculture and Food Innovation; Brisbane QLD 4072 Australia
- Tongji School of Pharmacy; Huazhong University of Science and Technology; Wuhan Hubei 430030 China
| | - Zachary Szablan
- Centre for Advanced Macromolecular Design; School of Chemical Engineering and Industrial Chemistry; The University of New South Wales (UNSW); Sydney NSW 2052 Australia
| | - Christopher Barner-Kowollik
- Centre for Advanced Macromolecular Design; School of Chemical Engineering and Industrial Chemistry; The University of New South Wales (UNSW); Sydney NSW 2052 Australia
| | - Pascal Hesse
- Institute of Physical Chemistry; University of Goettingen; Tammannstraße 6 37077 Goettingen Germany
| | - Michael Buback
- Institute of Physical Chemistry; University of Goettingen; Tammannstraße 6 37077 Goettingen Germany
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Aso E, Semakova J, Joda L, Semak V, Halbaut L, Calpena A, Escolano C, Perales JC, Ferrer I. Triheptanoin supplementation to ketogenic diet curbs cognitive impairment in APP/PS1 mice used as a model of familial Alzheimer's disease. Curr Alzheimer Res 2013; 10:290-7. [PMID: 23131121 DOI: 10.2174/15672050112099990128] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2012] [Revised: 10/30/2012] [Accepted: 11/01/2012] [Indexed: 11/22/2022]
Abstract
Diets containing a high proportion of fat with respect to protein plus carbohydrates are capable of inducing ketone body production in the liver, which provides an energetic alternative to glucose. Some ketogenic diets have been tested as therapeutic strategies for treating metabolic disorders related to a deficiency in glucose-driven ATP generation. However, ketone bodies are not capable of providing extra tricarboxylic acid cycle intermediates, limiting the anabolic capacity of the cell. Therefore, it is reasonable to hypothesize that supplementing a ketogenic diet with anaplerotic compounds such as triheptanoin may improve ketogenic diet effectiveness. The present study tests this hypothesis in APP/PS1 (APPswe/PS1dE9) transgenic mice, used as a model of familial Alzheimer's disease because impaired energy supply to neurons has been linked to this neurodegenerative process. Triheptanoin supplementation to a ketogenic diet for three months and starting at the age of three months reduces the memory impairment of APP/PS1 mice at the age of 6 months. The Aβ production and deposition were not significantly altered by the ketogenic diet, supplemented or not by triheptanoin. However, mice fed with triheptanoin-rich ketogenic diet have shown decreased astroglial response in the vicinity of Aβ plaques and decreased expression of the pro-inflammatory cytokine interferon-γ in astrocytes. These findings correlate with transcriptional up-regulation of the ROS detoxifying mechanisms Sirt1 and Pparg, thus linking triheptanoin with improved mitochondrial status. Present findings support the concept that ketogenic diets supplemented with anaplerotic compounds can be considered potential therapeutic strategies at early stages of Alzheimer's disease.
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Affiliation(s)
- Ester Aso
- Institut de Neuropatologia, Servei d'Anatomia Patològica, IDIBELL-Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Spain
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8
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Bertok T, Klukova L, Sediva A, Kasak P, Semak V, Micusik M, Omastova M, Chovanová L, Vlček M, Imrich R, Vikartovska A, Tkac J. Ultrasensitive impedimetric lectin biosensors with efficient antifouling properties applied in glycoprofiling of human serum samples. Anal Chem 2013; 85:7324-32. [PMID: 23808876 PMCID: PMC4881809 DOI: 10.1021/ac401281t] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Ultrasensitive impedimetric lectin biosensors recognizing different glycan entities on serum glycoproteins were constructed. Lectins were immobilized on a novel mixed self-assembled monolayer containing 11-mercaptoundecanoic acid for covalent immobilization of lectins and betaine terminated thiol to resist nonspecific interactions. Construction of biosensors based on Concanavalin A (Con A), Sambucus nigra agglutinin type I (SNA), and Ricinus communis agglutinin (RCA) on polycrystalline gold electrodes was optimized and characterized with a battery of tools including electrochemical impedance spectroscopy, various electrochemical techniques, quartz crystal microbalance (QCM), Fourier transform infrared (FT-IR) spectroscopy, atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS) and compared with a protein/lectin microarray. The lectin biosensors were able to detect glycoproteins from 1 fM (Con A), 10 fM (Ricinus communis agglutinin (RCA), or 100 fM (SNA) with a linear range spanning 6 (SNA), 7 (RCA), or 8 (Con A) orders of magnitude. Furthermore, a detection limit for the Con A biosensor down to 1 aM was achieved in a sandwich configuration. A nonspecific binding of proteins for the Con A biosensor was only 6.1% (probed with an oxidized invertase) of the signal toward its analyte invertase and a negligible nonspecific interaction of the Con A biosensor was observed in diluted human sera (1000×), as well. The performance of the lectin biosensors was finally tested by glycoprofiling of human serum samples from healthy individuals and those having rheumatoid arthritis, which resulted in a distinct glycan pattern between these two groups.
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Affiliation(s)
- Tomas Bertok
- Department of Glycobiotechnology, Institute of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovak Republic
| | - Ludmila Klukova
- Department of Glycobiotechnology, Institute of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovak Republic
| | - Alena Sediva
- Department of Glycobiotechnology, Institute of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovak Republic
| | - Peter Kasak
- Center for Advanced Materials, Qatar University, P.O.Box 2713, Doha, Qatar
| | - Vladislav Semak
- Department of Composite Materials, Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41, Bratislava, Slovak Republic
| | - Matej Micusik
- Department of Composite Materials, Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41, Bratislava, Slovak Republic
| | - Maria Omastova
- Department of Composite Materials, Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41, Bratislava, Slovak Republic
| | - Lucia Chovanová
- Laboratory of Human Endocrinology, Institute of Experimental Endocrinology, Slovak Academy of Sciences, Vlárska 3, 833 06, Bratislava, Slovak Republic
| | - Miroslav Vlček
- Laboratory of Human Endocrinology, Institute of Experimental Endocrinology, Slovak Academy of Sciences, Vlárska 3, 833 06, Bratislava, Slovak Republic
| | - Richard Imrich
- Laboratory of Human Endocrinology, Institute of Experimental Endocrinology, Slovak Academy of Sciences, Vlárska 3, 833 06, Bratislava, Slovak Republic
| | - Alica Vikartovska
- Department of Glycobiotechnology, Institute of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovak Republic
| | - Jan Tkac
- Department of Glycobiotechnology, Institute of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovak Republic
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9
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Amat M, Semak V, Escolano C, Molins E, Bosch J. Enantioselective, protecting group-free synthesis of 1S-ethyl-4-substituted quinolizidines. Org Biomol Chem 2012; 10:6866-75. [PMID: 22837110 DOI: 10.1039/c2ob25392e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A practical enantioselective protecting group-free four-step route to the key quinolizidinone 6 from phenylglycinol-derived bicyclic lactam 1 is reported. The Grignard addition reaction to 6 takes place stereoselectively to give 1-ethyl-4-substituted quinolizidines 4-epi-207I and 7-9. Following a similar synthetic sequence, 9a-epi-6 is also accessed. However, the addition of Grignard reagents to 9a-epi-6 proceeds in a non-stereoselective manner. In order to gain insight into the different stereochemical outcome in the two series, theoretical calculations on the iminium salts A and B have been performed. The study concludes that the addition of the hydride, which is the step that determines the configuration of the final products, occurs in a stereoelectronic controlled manner. The theoretical study is in agreement with the experimental results.
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Affiliation(s)
- Mercedes Amat
- Laboratory of Organic Chemistry, Faculty of Pharmacy, Institute of Biomedicine (IBUB), University of Barcelona, 08028 Barcelona, Spain.
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10
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Semak V, Metcalf TA, Endoma-Arias MAA, Mach P, Hudlicky T. Toluene dioxygenase mediated oxidation of halogen-substituted benzoate esters. Org Biomol Chem 2012; 10:4407-16. [PMID: 22562668 DOI: 10.1039/c2ob25202c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of ortho-, meta-, and para- halogen-substituted methyl benzoate esters was subjected to enzymatic dihydroxylation via the whole-cell fermentation with E. coli JM109 (pDTG601A). Only ortho-substituted benzoates were metabolized. Methyl 2-fluorobenzoate yielded one diol regioselectively whereas methyl 2-chloro-, methyl 2-bromo- and methyl 2-iodobenzoates each yielded a mixture of regioisomers. Absolute stereochemistry was determined for all new metabolites. Computational analysis of these results and a possible rationale for the regioselectivity of the enzymatic dihydroxylation is advanced.
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Affiliation(s)
- Vladislav Semak
- Department of Chemistry, Brock University, 500 Glenridge Ave, St. Catharines, ON, Canada L2S 3A1
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11
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Semak V, Semakova J, Halbaut L, Aso E, Ferrer I, Calpena A, Escolano C, Perales JC. Synthesis of triheptanoin and formulation as a solid diet for rodents. EUR J LIPID SCI TECH 2012. [DOI: 10.1002/ejlt.201100425] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Arróniz C, Gil-González A, Semak V, Escolano C, Bosch J, Amat M. Cooperative Catalysis for the First Asymmetric Formal [3+2] Cycloaddition Reaction of Isocyanoacetates to α,β-Unsaturated Ketones. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100409] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Hudlicky JR, Werner L, Semak V, Simionescu R, Hudlicky T. Dauben–Michno oxidative transposition of allylic cyanohydrins — Enantiomeric switch of (–)-carvone to (+)-carvone*Based on the 2010 Bader Award Lecture. CAN J CHEM 2011. [DOI: 10.1139/v11-026] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Allylic cyanohydrins were subjected to Dauben–Michno oxidation at low temperatures to provide β-cyanoenones in good to excellent yields. The potential of this oxidative transposition as a means of an enantiomeric switch of enones containing a latent plane of symmetry was tested by conversion of (–)-carvone to its enantiomer.
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Affiliation(s)
- Jason R. Hudlicky
- Department of Chemistry and Centre for Biotechnology, Brock University, 500 Glenridge Avenue, St. Catharines, ON L2S 3A1, Canada
| | - Lukas Werner
- Department of Chemistry and Centre for Biotechnology, Brock University, 500 Glenridge Avenue, St. Catharines, ON L2S 3A1, Canada
| | - Vladislav Semak
- Department of Chemistry and Centre for Biotechnology, Brock University, 500 Glenridge Avenue, St. Catharines, ON L2S 3A1, Canada
| | - Razvan Simionescu
- Department of Chemistry and Centre for Biotechnology, Brock University, 500 Glenridge Avenue, St. Catharines, ON L2S 3A1, Canada
| | - Tomas Hudlicky
- Department of Chemistry and Centre for Biotechnology, Brock University, 500 Glenridge Avenue, St. Catharines, ON L2S 3A1, Canada
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Semak V, Escolano C, Arróniz C, Bosch J, Amat M. A practical procedure for the removal of the phenylethanol moiety from phenylglycinol-derived lactams. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.09.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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