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Culcasi M, Delehedde C, Esgulian M, Cassien M, Chocry M, Rockenbauer A, Pietri S, Thétiot-Laurent S. New Biocompatible β-Phosphorylated Linear Nitrones Targeting Mitochondria: Protective Effect in Apoptotic Cells. Chembiochem 2023; 24:e202200749. [PMID: 36779388 DOI: 10.1002/cbic.202200749] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 02/10/2023] [Accepted: 02/13/2023] [Indexed: 02/14/2023]
Abstract
Mitochondria, an essential organelle involved in cellular respiration, energy production, and cell death, is the main cellular source of reactive oxygen species (ROS), including superoxide. Mitochondrial diseases resulting from uncontrolled/excess ROS generation are an emerging public health concern and there is current interest for specific mitochondriotropic probes to get information on in situ ROS production. As such, nitrones vectorized by the triphenylphosphonium (TPP) cation have recently drawn attention despite reported cytotoxicity. Herein, we describe the synthesis of 13 low-toxic derivatives of N-benzylidene-1-diethoxyphosphoryl-1-methylethylamine N-oxide (PPN) alkyl chain-grafted to a pyridinium, triethylammonium or berberinium lipophilic cation. These nitrones showed in vitro superoxide quenching activity and EPR/spin-trapping efficiency towards biologically relevant free radicals, including superoxide and hydroxyl radicals. Their mitochondrial penetration was confirmed by 31P NMR and anti-apoptotic properties assessed in hydrogen peroxide treated Schwann cells. Two pyridinium substituted PPNs were identified as potentially better alternatives to TPP nitrones conjugates for studies of mitochondrial oxidative damage.
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Affiliation(s)
- Marcel Culcasi
- Aix-Marseille Universite, Institut de Chimie Radicalaire, Campus St Jérôme - ICR, Avenue escadrille Normandie-Niemen, SMBSO - case 522, 13013, Marseille, FRANCE
| | - Caroline Delehedde
- Aix-Marseille Universite, Institut de Chimie Radicalaire, Campus St Jérôme - ICR, Avenue escadrille Normandie-Niemen, SMBSO - case 522, 13013, Marseille, FRANCE
| | - Mathieu Esgulian
- Aix-Marseille Universite, Institut de Chimie Radicalaire, Campus St Jérôme - ICR, Avenue escadrille Normandie-Niemen, SMBSO - case 522, 13013, Marseille, FRANCE
| | - Mathieu Cassien
- Aix-Marseille Universite, Institut de Chimie Radicalaire, Campus St Jérôme - ICR, Avenue escadrille Normandie-Niemen, SMBSO - case 522, 13013, Marseille, FRANCE
| | - Mathieu Chocry
- Aix-Marseille Universite, Institut de Chimie Radicalaire, Campus St Jérôme - ICR, Avenue escadrille Normandie-Niemen, SMBSO - case 522, 13013, Marseille, FRANCE
| | - Antal Rockenbauer
- Hungarian Academy of Sciences Research Centre for Natural Sciences: Termeszettudomanyi Kutatokozpont, Institute of Materials and Environmental Chemistry, Budapest University of Technology and Economics, 1117, Budapest, HUNGARY
| | - Sylvia Pietri
- Aix-Marseille Universite, Institut de Chimie Radicalaire, Campus St Jérôme - ICR, Avenue escadrille Normandie-Niemen, SMBSO - case 522, 13013, Marseille, FRANCE
| | - Sophie Thétiot-Laurent
- Aix-Marseille Université, Institut de Chimie Radicalaire, Campus St Jérôme - ICR, Avenue escadrille Normandie-Niemen, SMBSO - case 522, 13013, Marseille, FRANCE
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2
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Yao R, Beriashvili D, Zhang W, Li S, Safeer A, Gurinov A, Rockenbauer A, Yang Y, Song Y, Baldus M, Liu Y. Highly bioresistant, hydrophilic and rigidly linked trityl-nitroxide biradicals for cellular high-field dynamic nuclear polarization. Chem Sci 2022; 13:14157-14164. [PMID: 36540821 PMCID: PMC9728575 DOI: 10.1039/d2sc04668g] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2022] [Accepted: 11/16/2022] [Indexed: 09/23/2023] Open
Abstract
Cellular dynamic nuclear polarization (DNP) has been an effective means of overcoming the intrinsic sensitivity limitations of solid-state nuclear magnetic resonance (ssNMR) spectroscopy, thus enabling atomic-level biomolecular characterization in native environments. Achieving DNP signal enhancement relies on doping biological preparations with biradical polarizing agents (PAs). Unfortunately, PA performance within cells is often limited by their sensitivity to the reductive nature of the cellular lumen. Herein, we report the synthesis and characterization of a highly bioresistant and hydrophilic PA (StaPol-1) comprising the trityl radical OX063 ligated to a gem-diethyl pyrroline nitroxide via a rigid piperazine linker. EPR experiments in the presence of reducing agents such as ascorbate and in HeLa cell lysates demonstrate the reduction resistance of StaPol-1. High DNP enhancements seen in small molecules, proteins and cell lysates at 18.8 T confirm that StaPol-1 is an excellent PA for DNP ssNMR investigations of biomolecular systems at high magnetic fields in reductive environments.
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Affiliation(s)
- Ru Yao
- The Province and Ministry Co-sponsored Collaborative Innovation Center for Medical Epigenetics, Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University Tianjin 300070 P. R. China
| | - David Beriashvili
- NMR Spectroscopy Group, Bijvoet Center for Biomolecular Research, Utrecht University Padualaan 8 3584 CH Utrecht The Netherlands
| | - Wenxiao Zhang
- The Province and Ministry Co-sponsored Collaborative Innovation Center for Medical Epigenetics, Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University Tianjin 300070 P. R. China
| | - Shuai Li
- The Province and Ministry Co-sponsored Collaborative Innovation Center for Medical Epigenetics, Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University Tianjin 300070 P. R. China
| | - Adil Safeer
- NMR Spectroscopy Group, Bijvoet Center for Biomolecular Research, Utrecht University Padualaan 8 3584 CH Utrecht The Netherlands
| | - Andrei Gurinov
- NMR Spectroscopy Group, Bijvoet Center for Biomolecular Research, Utrecht University Padualaan 8 3584 CH Utrecht The Netherlands
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences And, Department of Physics, Budapest University of Technology and Economics Budafoki Ut 8 1111 Budapest Hungary
| | - Yin Yang
- State Key Laboratory of Elemento-organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University Tianjin 300071 China
| | - Yuguang Song
- The Province and Ministry Co-sponsored Collaborative Innovation Center for Medical Epigenetics, Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University Tianjin 300070 P. R. China
| | - Marc Baldus
- NMR Spectroscopy Group, Bijvoet Center for Biomolecular Research, Utrecht University Padualaan 8 3584 CH Utrecht The Netherlands
| | - Yangping Liu
- The Province and Ministry Co-sponsored Collaborative Innovation Center for Medical Epigenetics, Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University Tianjin 300070 P. R. China
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3
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Bailey DM, Culcasi M, Filipponi T, Brugniaux JV, Stacey BS, Marley CJ, Soria R, Rimoldi SF, Cerny D, Rexhaj E, Pratali L, Salmòn CS, Jáuregui CM, Villena M, Villafuerte F, Rockenbauer A, Pietri S, Scherrer U, Sartori C. EPR spectroscopic evidence of iron-catalysed free radical formation in chronic mountain sickness: Dietary causes and vascular consequences. Free Radic Biol Med 2022; 184:99-113. [PMID: 35398201 DOI: 10.1016/j.freeradbiomed.2022.03.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 03/24/2022] [Accepted: 03/29/2022] [Indexed: 12/12/2022]
Abstract
Chronic mountain sickness (CMS) is a high-altitude (HA) maladaptation syndrome characterised by elevated systemic oxidative-nitrosative stress (OXNOS) due to a free radical-mediated reduction in vascular nitric oxide (NO) bioavailability. To better define underlying mechanisms and vascular consequences, this study compared healthy male lowlanders (80 m, n = 10) against age/sex-matched highlanders born and bred in La Paz, Bolivia (3600 m) with (CMS+, n = 10) and without (CMS-, n = 10) CMS. Cephalic venous blood was assayed using electron paramagnetic resonance spectroscopy and reductive ozone-based chemiluminescence. Nutritional intake was assessed via dietary recall. Systemic vascular function and structure were assessed via flow-mediated dilatation, aortic pulse wave velocity and carotid intima-media thickness using duplex ultrasound and applanation tonometry. Basal systemic OXNOS was permanently elevated in highlanders (P = <0.001 vs. lowlanders) and further exaggerated in CMS+, reflected by increased hydroxyl radical spin adduct formation (P = <0.001 vs. CMS-) subsequent to liberation of free 'catalytic' iron consistent with a Fenton and/or nucleophilic addition mechanism(s). This was accompanied by elevated global protein carbonylation (P = 0.046 vs. CMS-) and corresponding reduction in plasma nitrite (P = <0.001 vs. lowlanders). Dietary intake of vitamins C and E, carotene, magnesium and retinol were lower in highlanders and especially deficient in CMS + due to reduced consumption of fruit and vegetables (P = <0.001 to 0.028 vs. lowlanders/CMS-). Systemic vascular function and structure were also impaired in highlanders (P = <0.001 to 0.040 vs. lowlanders) with more marked dysfunction observed in CMS+ (P = 0.035 to 0.043 vs. CMS-) in direct proportion to systemic OXNOS (r = -0.692 to 0.595, P = <0.001 to 0.045). Collectively, these findings suggest that lifelong exposure to iron-catalysed systemic OXNOS, compounded by a dietary deficiency of antioxidant micronutrients, likely contributes to the systemic vascular complications and increased morbidity/mortality in CMS+. TRIAL REGISTRY: ClinicalTrials.gov; No: NCT01182792; URL: www.clinicaltrials.gov.
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Affiliation(s)
- Damian M Bailey
- Neurovascular Research Laboratory, Faculty of Life Sciences and Education, University of South Wales, Wales, UK.
| | - Marcel Culcasi
- Aix Marseille Univ, CNRS, ICR, UMR, 7273, Marseille, France
| | - Teresa Filipponi
- Neurovascular Research Laboratory, Faculty of Life Sciences and Education, University of South Wales, Wales, UK
| | - Julien V Brugniaux
- Neurovascular Research Laboratory, Faculty of Life Sciences and Education, University of South Wales, Wales, UK; HP2 Laboratory, INSERM U1300, Grenoble Alpes University, Grenoble, France
| | - Benjamin S Stacey
- Neurovascular Research Laboratory, Faculty of Life Sciences and Education, University of South Wales, Wales, UK
| | - Christopher J Marley
- Neurovascular Research Laboratory, Faculty of Life Sciences and Education, University of South Wales, Wales, UK
| | - Rodrigo Soria
- Department of Cardiology and Biomedical Research, University Hospital, Bern, Switzerland
| | - Stefano F Rimoldi
- Department of Cardiology and Biomedical Research, University Hospital, Bern, Switzerland
| | - David Cerny
- Department of Cardiology and Biomedical Research, University Hospital, Bern, Switzerland
| | - Emrush Rexhaj
- Department of Cardiology and Biomedical Research, University Hospital, Bern, Switzerland
| | | | | | | | | | - Francisco Villafuerte
- Laboratorio de Fisiología Comparada, Departamento de Ciencias Biológicas y Fisiológicas, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Research Center for Natural Sciences, 1117, Budapest, Hungary
| | - Sylvia Pietri
- Aix Marseille Univ, CNRS, ICR, UMR, 7273, Marseille, France
| | - Urs Scherrer
- Department of Cardiology and Biomedical Research, University Hospital, Bern, Switzerland; Facultad de Ciencias, Departamento de Biología, Universidad de Tarapacá, Arica, Chile
| | - Claudio Sartori
- Department of Internal Medicine, University Hospital, UNIL-Lausanne, Switzerland
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Cai X, Lucini Paioni A, Adler A, Yao R, Zhang W, Beriashvili D, Safeer A, Gurinov A, Rockenbauer A, Song Y, Baldus M, Liu Y. Highly Efficient Trityl-Nitroxide Biradicals for Biomolecular High-Field Dynamic Nuclear Polarization. Chemistry 2021; 27:12758-12762. [PMID: 34181286 DOI: 10.1002/chem.202102253] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Indexed: 12/22/2022]
Abstract
Dynamic nuclear polarization (DNP) is a powerful method to enhance the sensitivity of solid-state magnetic nuclear resonance (ssNMR) spectroscopy. However, its biomolecular applications at high magnetic fields (preferably>14 T) have so far been limited by the intrinsically low efficiency of polarizing agents and sample preparation aspects. Herein, we report a new class of trityl-nitroxide biradicals, dubbed SNAPols that combine high DNP efficiency with greatly enhanced hydrophilicity. SNAPol-1, the best compound in the series, shows DNP enhancement factors at 18.8 T of more than 100 in small molecules and globular proteins and also exhibits strong DNP enhancements in membrane proteins and cellular preparations. By integrating optimal sensitivity and high resolution, we expect widespread applications of this new polarizing agent in high-field DNP/ssNMR spectroscopy, especially for complex biomolecules.
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Affiliation(s)
- Xinyi Cai
- The province and ministry co-sponsored collaborative innovation center for medical epigenetics Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics School of Pharmacy, Tianjin Medical University, Tianjin, 300070, P. R. China
| | - Alessandra Lucini Paioni
- NMR Spectroscopy group Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Agnes Adler
- NMR Spectroscopy group Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Ru Yao
- The province and ministry co-sponsored collaborative innovation center for medical epigenetics Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics School of Pharmacy, Tianjin Medical University, Tianjin, 300070, P. R. China
| | - Wenxiao Zhang
- The province and ministry co-sponsored collaborative innovation center for medical epigenetics Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics School of Pharmacy, Tianjin Medical University, Tianjin, 300070, P. R. China
| | - David Beriashvili
- NMR Spectroscopy group Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Adil Safeer
- NMR Spectroscopy group Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Andrei Gurinov
- NMR Spectroscopy group Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry Hungarian Academy of Sciences and Department of Physics, Budapest University of Technology and Economics Budafoki ut 8, 1111, Budapest, Hungary
| | - Yuguang Song
- The province and ministry co-sponsored collaborative innovation center for medical epigenetics Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics School of Pharmacy, Tianjin Medical University, Tianjin, 300070, P. R. China
| | - Marc Baldus
- NMR Spectroscopy group Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Yangping Liu
- The province and ministry co-sponsored collaborative innovation center for medical epigenetics Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics School of Pharmacy, Tianjin Medical University, Tianjin, 300070, P. R. China
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5
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Abstract
Tetrathiatriarylmethyl (trityl) radicals have been recently shown to react with biological oxidoreductants including glutathione (GSH), ascorbic acid (Asc), and superoxide anion radical (O2•-). However, how the substituents affect the reactivity of trityl radicals is still unknown. In this work, five asymmetric trityl radicals were synthesized and their reactivities with GSH, Asc, and O2•- investigated. Under aerobic conditions, GSH induces fast decays for the thioether- (TSA) and N-methyleneglycine-substituted (TGA) derivatives and slow decay for the 4-carboxyphenyl-containing one (TPA). Under anaerobic conditions, the direct reduction of these radicals by GSH also occurs with rate constants (kGSH) from 1.8 × 10-4 M-1 s-1 for TPA to 1.0 × 10-2 M-1 s-1 for TGA. Moreover, these radicals can also react with O2•- with rate constants (kSO) from 1.2 × 103 M-1 s-1 for ET-01 to 1.6 × 104 M-1 s-1 for TGA. Surprisingly, these radicals are completely inert to Asc in both aerobic and anaerobic conditions. Additionally, the substituents exert an important effect on redox potentials of these trityl radicals. This work demonstrates that the redox properties of the trityl radicals strongly depend on their substituents, and TPA with high stability toward GSH shows great potential for intracellular applications.
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Affiliation(s)
- Li Chen
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, Department of Medicinal Chemistry, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China
| | - Lanlan Wu
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, Department of Medicinal Chemistry, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China
| | - Xiaoli Tan
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, Department of Medicinal Chemistry, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1117 Budapest, Hungary.,Department of Physics, Budapest University of Technology and Economics, Budafoki ut 8, 1111 Budapest, Hungary
| | - Yuguang Song
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, Department of Medicinal Chemistry, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China
| | - Yangping Liu
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, Department of Medicinal Chemistry, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China
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Šimková L, Klíma J, Lušpai K, Malček M, Rockenbauer A. In situ simultaneous electrochemical ESR study of radicals generated from 2,2-dinitroethene-1,1-diamine (FOX-7). Intramolecular chemical exchange resulting in an alternation line-width effect. J Magn Reson 2021; 323:106895. [PMID: 33429171 DOI: 10.1016/j.jmr.2020.106895] [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] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 12/03/2020] [Accepted: 12/15/2020] [Indexed: 06/12/2023]
Abstract
The molecule of 2,2-dinitroethene-1,1-diamine (FOX-7) is one of the most interesting molecules with multiple redox centres stabilized by push-pull effect. To reveal the detailed mechanism of its electrochemical process radical intermediates formed in the course of its electrochemical reduction in organic aprotic media have been studied by in situ simultaneous electrochemical ESR measurements (SEESR). The radical generated on the second reduction step possesses an alternating line-width (AL) effect in the ESR spectra as a result of intramolecular dynamic processes in the timescale of ESR splitting constants. The spectra measured at different temperatures (230-335 K) were analysed with the help of a fitting program which includes a molecular dynamics. Observed dynamics describes well an asymmetric 2-site exchange model for the whole temperature range. With help of the optimized parameters and quantum chemical calculations this radical has been identified as 2,2-dinitroethane-1-amine-1-imine radical dianion, [(H2N)(HN)C=C(NO2)2]2-. The dynamic process responsible for the AL effect consists of mutual turning (changing of dihedral angle) of the both nitro groups, resulting in an intramolecular spin-density (electron) transfer. The dynamic parameters of the process have been established.
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Affiliation(s)
- Ludmila Šimková
- Department of Molecular Electrochemistry and Catalysis, J. Heyrovský Institute of Physical Chemistry, Academy of Sciences, Dolejškova 2155/3, CZ-18223 Prague 8, Czech Republic
| | - Jiří Klíma
- Department of Molecular Electrochemistry and Catalysis, J. Heyrovský Institute of Physical Chemistry, Academy of Sciences, Dolejškova 2155/3, CZ-18223 Prague 8, Czech Republic
| | - Karol Lušpai
- Department of Molecular Electrochemistry and Catalysis, J. Heyrovský Institute of Physical Chemistry, Academy of Sciences, Dolejškova 2155/3, CZ-18223 Prague 8, Czech Republic; Department of Physical Chemistry, Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, SK-81237 Bratislava, Slovak Republic.
| | - Michal Malček
- Department of Physical Chemistry, Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, SK-81237 Bratislava, Slovak Republic
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary; Department of Physics, Budapest University of Technology and Economics, Budafoki út 8, H-1111 Budapest, Hungary
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7
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Zhai W, Lucini Paioni A, Cai X, Narasimhan S, Medeiros-Silva J, Zhang W, Rockenbauer A, Weingarth M, Song Y, Baldus M, Liu Y. Postmodification via Thiol-Click Chemistry Yields Hydrophilic Trityl-Nitroxide Biradicals for Biomolecular High-Field Dynamic Nuclear Polarization. J Phys Chem B 2020; 124:9047-9060. [PMID: 32961049 DOI: 10.1021/acs.jpcb.0c08321] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Dynamic nuclear polarization (DNP) is a powerful method to enhance nuclear magnetic resonance (NMR) signal intensities, enabling unprecedented applications in life and material science. An ultimate goal is to expand the use of DNP-enhanced solid-state NMR to ultrahigh magnetic fields where optimal spectral resolution and sensitivity are integrated. Trityl-nitroxide (TN) biradicals have attracted significant interest in high-field DNP, but their application to complex (bio)molecules has so far been limited. Here we report a novel postmodification strategy for synthesis of hydrophilic TN biradicals in order to improve their use in biomolecular applications. Initially, three TN biradicals (referred to as NATriPols 1-3) with amino-acid linkers were synthesized. EPR studies showed that the α-position of the amino-acid linkers is an ideal modification site for these biradicals since their electron-electron magnetic interactions are marginally affected by the substituents at this position. On the basis of this finding, we synthesized NATriPol-4 with pyridine disulfide appended at the α-position. Postmodification of NATriPol-4 via thiol-click chemistry resulted in various TN biradicals including hydrophilic NATriPol-5 in a quantitative manner. Interestingly, DNP enhancements at 18.8 T of NATriPols for 13C,15N-proline in a glycerol/water matrix are inversely correlated with their hydrophobicity. Importantly, applications of hydrophilic NATriPol-5 and NATriPol-3 to biomolecules including a globular soluble protein and a membrane targeting peptide reveal significantly improved performance compared to TEMTriPol-1 and AMUPol. Our work provides an efficient approach for one-step synthesis of new polarizing agents with tunable physicochemical properties, thus expediting optimization of new biradicals for biomolecular applications at ultrahigh magnetic fields.
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Affiliation(s)
- Weixiang Zhai
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China
| | - Alessandra Lucini Paioni
- NMR Spectroscopy, Bijvoet Centre for Biomolecular Research, Utrecht University, 3584 CH Utrecht, The Netherlands
| | - Xinyi Cai
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China
| | - Siddarth Narasimhan
- NMR Spectroscopy, Bijvoet Centre for Biomolecular Research, Utrecht University, 3584 CH Utrecht, The Netherlands
| | - João Medeiros-Silva
- NMR Spectroscopy, Bijvoet Centre for Biomolecular Research, Utrecht University, 3584 CH Utrecht, The Netherlands
| | - Wenxiao Zhang
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences, and Department of Physics, Budapest University of Technology and Economics, Budafokiut 8, 1111 Budapest, Hungary
| | - Markus Weingarth
- NMR Spectroscopy, Bijvoet Centre for Biomolecular Research, Utrecht University, 3584 CH Utrecht, The Netherlands
| | - Yuguang Song
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China
| | - Marc Baldus
- NMR Spectroscopy, Bijvoet Centre for Biomolecular Research, Utrecht University, 3584 CH Utrecht, The Netherlands
| | - Yangping Liu
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China
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8
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Abstract
The host-guest interaction of nitroxide radicals with water-soluble pillar[n]arenes was studied for the first time by electron paramagnetic resonance spectroscopy and NMR spectroscopy. Our results showed that this interaction strongly depended on the 4-substituents of nitroxides and the cavity size of pillar[n]arenes. The host-guest interaction with water-soluble pillar[6]arene WP6 effectively increased the thermodynamic and kinetic stability of nitroxide radical 4-AT toward ascorbic acid, thus expanding its potential biomedical applications.
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Affiliation(s)
- Xue Wang
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P.R. China.
| | - Kaiyun Ji
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P.R. China.
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences, Department of Physics, Budapest University of Technology and Economics, Budafoki ut8, 1111 Budapest, Hungary
| | - Yangping Liu
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P.R. China.
| | - Yuguang Song
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P.R. China.
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9
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Tan X, Ji K, Wang X, Yao R, Han G, Villamena FA, Zweier JL, Song Y, Rockenbauer A, Liu Y. Discriminative Detection of Biothiols by Electron Paramagnetic Resonance Spectroscopy using a Methanethiosulfonate Trityl Probe. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201912832] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Xiaoli Tan
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and DiagnosticsSchool of PharmacyTianjin Medical University Tianjin 300070 P. R. China
| | - Kaiyun Ji
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and DiagnosticsSchool of PharmacyTianjin Medical University Tianjin 300070 P. R. China
| | - Xing Wang
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and DiagnosticsSchool of PharmacyTianjin Medical University Tianjin 300070 P. R. China
| | - Ru Yao
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and DiagnosticsSchool of PharmacyTianjin Medical University Tianjin 300070 P. R. China
| | - Guifang Han
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and DiagnosticsSchool of PharmacyTianjin Medical University Tianjin 300070 P. R. China
| | - Frederick A. Villamena
- Department of Biological Chemistry and PharmacologyCollege of MedicineThe Ohio State University Columbus OH 43210 USA
| | - Jay L. Zweier
- Center for Biomedical EPR Spectroscopy and ImagingThe Davis Heart and Lung Research Institutethe Division of Cardiovascular MedicineDepartment of Internal MedicineThe Ohio State University Columbus OH 43210 USA
| | - Yuguang Song
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and DiagnosticsSchool of PharmacyTianjin Medical University Tianjin 300070 P. R. China
| | - Antal Rockenbauer
- Institute of Materials and Environmental ChemistryResearch Centre for Natural SciencesHungarian Academy of Sciences 1117 Budapest Hungary
- Department of PhysicsBudapest University of Technology and Economics Budafoki ut 8 1111 Budapest Hungary
| | - Yangping Liu
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and DiagnosticsSchool of PharmacyTianjin Medical University Tianjin 300070 P. R. China
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10
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Tan X, Ji K, Wang X, Yao R, Han G, Villamena FA, Zweier JL, Song Y, Rockenbauer A, Liu Y. Discriminative Detection of Biothiols by Electron Paramagnetic Resonance Spectroscopy using a Methanethiosulfonate Trityl Probe. Angew Chem Int Ed Engl 2019; 59:928-934. [PMID: 31657108 DOI: 10.1002/anie.201912832] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Indexed: 12/30/2022]
Abstract
Biothiols, such as glutathione (GSH), homocysteine (Hcy), and cysteine (Cys), coexist in biological systems with diverse biological roles. Thus, analytical techniques that can detect, quantify, and distinguish between multiple biothiols are desirable but challenging. Herein, we demonstrate the simultaneous detection and quantitation of multiple biothiols, including up to three different biothiols in a single sample, using electron paramagnetic resonance (EPR) spectroscopy and a trityl-radical-based probe (MTST). We term this technique EPR thiol-trapping. MTST could trap thiols through its methanethiosulfonate group to form the corresponding disulfide conjugate with an EPR spectrum characteristic of the trapped thiol. MTST was used to investigate effects of l-buthionine sulfoximine (BSO) and pyrrolidine dithiocarbamate (PDTC) on the efflux of GSH and Cys from HepG2 cells.
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Affiliation(s)
- Xiaoli Tan
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin, 300070, P. R. China
| | - Kaiyun Ji
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin, 300070, P. R. China
| | - Xing Wang
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin, 300070, P. R. China
| | - Ru Yao
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin, 300070, P. R. China
| | - Guifang Han
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin, 300070, P. R. China
| | - Frederick A Villamena
- Department of Biological Chemistry and Pharmacology, College of Medicine, The Ohio State University, Columbus, OH, 43210, USA
| | - Jay L Zweier
- Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, the Division of Cardiovascular Medicine, Department of Internal Medicine, The Ohio State University, Columbus, OH, 43210, USA
| | - Yuguang Song
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin, 300070, P. R. China
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1117, Budapest, Hungary.,Department of Physics, Budapest University of Technology and Economics, Budafoki ut 8, 1111, Budapest, Hungary
| | - Yangping Liu
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin, 300070, P. R. China
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11
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Headley CA, Hoffman CN, Freisen JM, Han Y, Macklin JM, Zweier JL, Rockenbauer A, Kuret J, Villamena FA. Membrane-specific spin trap, 5-dodecylcarbamoyl-5-N-dodecylacetamide-1-pyroline-N-oxide (diC 12PO): theoretical, bioorthogonal fluorescence imaging and EPR studies. Org Biomol Chem 2019; 17:7694-7705. [PMID: 31328213 DOI: 10.1039/c9ob01334b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Membranous organelles are major endogenous sources of reactive oxygen and nitrogen species. When present at high levels, these species can cause macromolecular damage and disease. To better detect and scavenge free radical forms of the reactive species at their sources, we investigated whether nitrone spin traps could be selectively targeted to intracellular membranes using a bioorthogonal imaging approach. Electron paramagnetic resonance imaging demonstrated that the novel cyclic nitrone 5-dodecylcarbamoyl-5-N-dodecylacetamide-1-pyroline-N-oxide (diC12PO) could be used to target the nitrone moiety to liposomes composed of phosphatidyl choline. To test localization with authentic membranes in living cells, fluorophores were introduced via strain-promoted alkyne-nitrone cycloaddition (SPANC). Two fluorophore-conjugated alkynes were investigated: hexynamide-fluoresceine (HYA-FL) and dibenzylcyclooctyne-PEG4-5/6-sulforhodamine B (DBCO-Rhod). Computational and mass spectrometry experiments confirmed the cycloadduct formation of DBCO-Rhod (but not HYA-FL) with diC12PO in cell-free solution. Confocal microscopy of bovine aortic endothelial cells treated sequentially with diC12PO and DBCO-Rhod demonstrated clear localization of fluorescence with intracellular membranes. These results indicate that targeting of nitrone spin traps to cellular membranes is feasible, and that a bioorthogonal approach can aid the interrogation of their intracellular compartmentalization properties.
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Affiliation(s)
- Colwyn A Headley
- Department of Biological Chemistry and Pharmacology, College of Medicine, The Ohio State University, Columbus, OH 43210, USA.
| | - Claire N Hoffman
- Department of Biological Chemistry and Pharmacology, College of Medicine, The Ohio State University, Columbus, OH 43210, USA.
| | - Juliana M Freisen
- Department of Biological Chemistry and Pharmacology, College of Medicine, The Ohio State University, Columbus, OH 43210, USA.
| | - Yongbin Han
- Department of Biological Chemistry and Pharmacology, College of Medicine, The Ohio State University, Columbus, OH 43210, USA.
| | - Joseph M Macklin
- Department of Biological Chemistry and Pharmacology, College of Medicine, The Ohio State University, Columbus, OH 43210, USA.
| | - Jay L Zweier
- Davis Heart and Lung Research Institute, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, OH 43210, USA
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences, and Department of Physics, Budapest University of Technology and Economics, Budapest, Hungary
| | - Jeff Kuret
- Department of Biological Chemistry and Pharmacology, College of Medicine, The Ohio State University, Columbus, OH 43210, USA.
| | - Frederick A Villamena
- Department of Biological Chemistry and Pharmacology, College of Medicine, The Ohio State University, Columbus, OH 43210, USA.
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12
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Combes S, Tran KT, Ayhan MM, Karoui H, Rockenbauer A, Tonetto A, Monnier V, Charles L, Rosas R, Viel S, Siri D, Tordo P, Clair S, Wang R, Bardelang D, Ouari O. Triangular Regulation of Cucurbit[8]uril 1:1 Complexes. J Am Chem Soc 2019; 141:5897-5907. [PMID: 30808163 DOI: 10.1021/jacs.9b00150] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Triangular shapes have inspired scientists over time and are common in nature, such as the flower petals of oxalis triangularis, the triangular faces of tetrahedrite crystals, and the icosahedron faces of virus capsids. Supramolecular chemistry has enabled the construction of triangular assemblies, many of which possess functional features. Among these structures, cucurbiturils have been used to build supramolecular triangles, and we recently reported paramagnetic cucurbit[8]uril (CB[8]) triangles, but the reasons for their formation remain unclear. Several parameters have now been identified to explain their formation. At first sight, the radical nature of the guest was of prime importance in obtaining the triangles, and we focused on extending this concept to biradicals to get supramolecular hexaradicals. Two sodium ions were systematically observed by ESI-MS in trimer structures, and the presence of Na+ triggered or strengthened the triangulation of CB[8]/guest 1:1 complexes in solution. X-ray crystallography and molecular modeling have allowed the proposal of two plausible sites of residence for the two sodium cations. We then found that a diamagnetic guest with an H-bond acceptor function is equally good at forming CB[8] triangles. Hence, a guest molecule containing a ketone function has been precisely triangulated thanks to CB[8] and sodium cations as determined by DOSY-NMR and DLS. A binding constant for the triangulation of 1:1 to 3:3 complexes is proposed. This concept has finally been extended to the triangulation of ditopic guests toward network formation by the reticulation of CB[8] triangles using dinitroxide biradicals.
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Affiliation(s)
- Sébastien Combes
- Aix Marseille Univ , CNRS, ICR , Marseille , France.,Centre de Recherche en Cancérologie de Marseille (CRCM), CNRS UMR7258, Inserm U1068, Institut Paoli-Calmettes , Aix Marseille Univ, UM105 , 13009 Marseille , France
| | | | - Mehmet Menaf Ayhan
- Aix Marseille Univ , CNRS, ICR , Marseille , France.,Department of Chemistry , Gebze Technical University , P.K.141 , 41400 Gebze , Kocaeli , Turkey
| | - Hakim Karoui
- Aix Marseille Univ , CNRS, ICR , Marseille , France
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry , Hungarian Academy of Sciences , P.O. Box. 286, 1519 Budapest , Hungary.,Department of Physics , Budapest University of Technology and Economics , 1111 Budapest , Hungary
| | - Alain Tonetto
- Aix Marseille Univ , CNRS, Centrale Marseille, FSCM (FR1739), PRATIM , F-13397 Marseille , France
| | - Valérie Monnier
- Aix Marseille Univ , CNRS, Centrale Marseille, FSCM, Spectropole , Marseille , France
| | | | - Roselyne Rosas
- Aix Marseille Univ , CNRS, Centrale Marseille, FSCM, Spectropole , Marseille , France
| | - Stéphane Viel
- Aix Marseille Univ , CNRS, ICR , Marseille , France.,Institut Universitaire de France , F-75005 Paris , France
| | - Didier Siri
- Aix Marseille Univ , CNRS, ICR , Marseille , France
| | - Paul Tordo
- Aix Marseille Univ , CNRS, ICR , Marseille , France
| | - Sylvain Clair
- Aix Marseille Univ, University of Toulon , CNRS, IM2NP, Marseille , France
| | - Ruibing Wang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences , University of Macau , Taipa , Macau , China
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13
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Besson E, Gastaldi S, Bloch E, Zielonka J, Zielonka M, Kalyanaraman B, Aslan S, Karoui H, Rockenbauer A, Ouari O, Hardy M. Embedding cyclic nitrone in mesoporous silica particles for EPR spin trapping of superoxide and other radicals. Analyst 2019; 144:4194-4203. [DOI: 10.1039/c9an00468h] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Mesoporous silica functionalised with a cyclic spin trap enabled the identification of a wide range of radicals in organic and aqueous media, including superoxide radical anion.
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Affiliation(s)
| | | | - Emily Bloch
- Aix Marseille Univ
- CNRS
- MADIREL
- Marseille
- France
| | - Jacek Zielonka
- Department of Biophysics
- Medical College of Wisconsin
- Milwaukee
- USA
- Free Radical Research Center
| | - Monika Zielonka
- Department of Biophysics
- Medical College of Wisconsin
- Milwaukee
- USA
- Free Radical Research Center
| | - Balaraman Kalyanaraman
- Department of Biophysics
- Medical College of Wisconsin
- Milwaukee
- USA
- Free Radical Research Center
| | | | | | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- 1117 Budapest
- Hungary
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14
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Le Breton N, Longhi S, Rockenbauer A, Guigliarelli B, Marque SRA, Belle V, Martinho M. Probing the dynamic properties of two sites simultaneously in a protein–protein interaction process: a SDSL-EPR study. Phys Chem Chem Phys 2019; 21:22584-22588. [DOI: 10.1039/c9cp04660g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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
Probing two sites simultaneously in a protein–protein interaction process combining spin labels of different EPR signatures.
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Affiliation(s)
| | - S. Longhi
- Aix Marseille Univ
- CNRS
- AFMB
- Marseille
- France
| | - A. Rockenbauer
- Research Center of Natural Sciences
- Budapest University of Technology and Economics
- Budapest
- Hungary
| | | | | | - V. Belle
- Aix Marseille Univ., CNRS, BIP
- Marseille
- France
| | - M. Martinho
- Aix Marseille Univ., CNRS, BIP
- Marseille
- France
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15
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Tan X, Tao S, Liu W, Rockenbauer A, Villamena FA, Zweier JL, Song Y, Liu Y. Synthesis and Characterization of the Perthiatriarylmethyl Radical and Its Dendritic Derivatives with High Sensitivity and Selectivity to Superoxide Radical. Chemistry 2018. [DOI: 10.1002/chem.201801311] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xiaoli Tan
- Tianjin Key Laboratory on Technologies Enabling Development of; Clinical Therapeutics and Diagnostics; School of Pharmacy; Tianjin Medical University; Tianjin 300070 P.R. China
| | - Shanqing Tao
- Tianjin Key Laboratory on Technologies Enabling Development of; Clinical Therapeutics and Diagnostics; School of Pharmacy; Tianjin Medical University; Tianjin 300070 P.R. China
| | - Wenbo Liu
- Tianjin Key Laboratory on Technologies Enabling Development of; Clinical Therapeutics and Diagnostics; School of Pharmacy; Tianjin Medical University; Tianjin 300070 P.R. China
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry; Hungarian Academy of Sciences and; Department of Physics; Budapest University of Technology and Economics; Budafoki ut 8 1111 Budapest Hungary
| | - Frederick A. Villamena
- Department of Biological Chemistry and Pharmacology; College of Medicine; The Ohio State University; Columbus OH 43210 USA
| | - Jay L. Zweier
- Center for Biomedical EPR Spectroscopy and Imaging; The Davis Heart and Lung Research Institute; Division of Cardiovascular Medicine; Department of Internal Medicine; The Ohio State University; Columbus OH 43210 USA
| | - Yuguang Song
- Tianjin Key Laboratory on Technologies Enabling Development of; Clinical Therapeutics and Diagnostics; School of Pharmacy; Tianjin Medical University; Tianjin 300070 P.R. China
| | - Yangping Liu
- Tianjin Key Laboratory on Technologies Enabling Development of; Clinical Therapeutics and Diagnostics; School of Pharmacy; Tianjin Medical University; Tianjin 300070 P.R. China
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16
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Tan X, Tao S, Liu W, Rockenbauer A, Villamena FA, Zweier JL, Song Y, Liu Y. Front Cover: Synthesis and Characterization of the Perthiatriarylmethyl Radical and Its Dendritic Derivatives with High Sensitivity and Selectivity to Superoxide Radical (Chem. Eur. J. 27/2018). Chemistry 2018. [DOI: 10.1002/chem.201801310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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)
- Xiaoli Tan
- Tianjin Key Laboratory on Technologies Enabling Development of; Clinical Therapeutics and Diagnostics; School of Pharmacy; Tianjin Medical University; Tianjin 300070 P.R. China
| | - Shanqing Tao
- Tianjin Key Laboratory on Technologies Enabling Development of; Clinical Therapeutics and Diagnostics; School of Pharmacy; Tianjin Medical University; Tianjin 300070 P.R. China
| | - Wenbo Liu
- Tianjin Key Laboratory on Technologies Enabling Development of; Clinical Therapeutics and Diagnostics; School of Pharmacy; Tianjin Medical University; Tianjin 300070 P.R. China
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry; Hungarian Academy of Sciences and; Department of Physics; Budapest University of Technology and Economics; Budafoki ut 8 1111 Budapest Hungary
| | - Frederick A. Villamena
- Department of Biological Chemistry and Pharmacology; College of Medicine; The Ohio State University; Columbus OH 43210 USA
| | - Jay L. Zweier
- Center for Biomedical EPR Spectroscopy and Imaging; The Davis Heart and Lung Research Institute; Division of Cardiovascular Medicine; Department of Internal Medicine; The Ohio State University; Columbus OH 43210 USA
| | - Yuguang Song
- Tianjin Key Laboratory on Technologies Enabling Development of; Clinical Therapeutics and Diagnostics; School of Pharmacy; Tianjin Medical University; Tianjin 300070 P.R. China
| | - Yangping Liu
- Tianjin Key Laboratory on Technologies Enabling Development of; Clinical Therapeutics and Diagnostics; School of Pharmacy; Tianjin Medical University; Tianjin 300070 P.R. China
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17
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Zhai W, Feng Y, Liu H, Rockenbauer A, Mance D, Li S, Song Y, Baldus M, Liu Y. Diastereoisomers of l-proline-linked trityl-nitroxide biradicals: synthesis and effect of chiral configurations on exchange interactions. Chem Sci 2018; 9:4381-4391. [PMID: 29896379 PMCID: PMC5958346 DOI: 10.1039/c8sc00969d] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 04/05/2018] [Indexed: 01/08/2023] Open
Abstract
The chiral configuration of the two radical parts is a crucial factor controlling the exchange interactions and DNP properties of trityl-nitroxide biradicals.
The exchange (J) interaction of organic biradicals is a crucial factor controlling their physiochemical properties and potential applications and can be modulated by changing the nature of the linker. In the present work, we for the first time demonstrate the effect of chiral configurations of radical parts on the J values of trityl-nitroxide (TN) biradicals. Four diastereoisomers (TNT1, TNT2, TNL1 and TNL2) of TN biradicals were synthesized and purified by the conjugation of a racemic (R/S) nitroxide with the racemic (M/P) trityl radical vial-proline. The absolute configurations of these diastereoisomers were assigned by comparing experimental and calculated electronic circular dichroism (ECD) spectra as (M, S, S) for TNT1, (P, S, S) for TNT2, (M, S, R) for TNL1 and (P, S, R) for TNL2. Electron paramagnetic resonance (EPR) results showed that the configuration of the nitroxide part instead of the trityl part is dominant in controlling the exchange interactions and the order of the J values at room temperature is TNT1 (252 G) > TNT2 (127 G) ≫ TNL2 (33 G) > TNL1 (14 G). Moreover, the J values of TNL1/TNL2 with the S configuration in the nitroxide part vary with temperature and the polarity of solvents due to their flexible linker, whereas the J values of TNT1/TNT2 are almost insensitive to these two factors due to the rigidity of their linkers. The distinct exchange interactions between TNT1,2 and TNL1,2 in the frozen state led to strongly different high-field dynamic nuclear polarization (DNP) enhancements with ε = 7 for TNT1,2 and 40 for TNL1,2 under 800 MHz DNP conditions.
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Affiliation(s)
- Weixiang Zhai
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics , School of Pharmacy , Tianjin Medical University , Tianjin 300070 , P. R. China . ;
| | - Yalan Feng
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics , School of Pharmacy , Tianjin Medical University , Tianjin 300070 , P. R. China . ;
| | - Huiqiang Liu
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics , School of Pharmacy , Tianjin Medical University , Tianjin 300070 , P. R. China . ;
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry , Hungarian Academy of Sciences , Department of Physics , Budapest University of Technology and Economics , Budafoki ut 8 , 1111 Budapest , Hungary .
| | - Deni Mance
- NMR Spectroscopy , Bijvoet Center for Biomolecular Research , Utrecht University , 3584 CH Utrecht , The Netherlands
| | - Shaoyong Li
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics , School of Pharmacy , Tianjin Medical University , Tianjin 300070 , P. R. China . ;
| | - Yuguang Song
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics , School of Pharmacy , Tianjin Medical University , Tianjin 300070 , P. R. China . ;
| | - Marc Baldus
- NMR Spectroscopy , Bijvoet Center for Biomolecular Research , Utrecht University , 3584 CH Utrecht , The Netherlands
| | - Yangping Liu
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics , School of Pharmacy , Tianjin Medical University , Tianjin 300070 , P. R. China . ;
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18
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Tan X, Tao S, Liu W, Rockenbauer A, Villamena FA, Zweier JL, Song Y, Liu Y. Synthesis and Characterization of the Perthiatriarylmethyl Radical and Its Dendritic Derivatives with High Sensitivity and Selectivity to Superoxide Radical. Chemistry 2018; 24:6958-6967. [DOI: 10.1002/chem.201800134] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 03/03/2018] [Indexed: 01/13/2023]
Affiliation(s)
- Xiaoli Tan
- Tianjin Key Laboratory on Technologies Enabling Development of; Clinical Therapeutics and Diagnostics; School of Pharmacy; Tianjin Medical University; Tianjin 300070 P.R. China
| | - Shanqing Tao
- Tianjin Key Laboratory on Technologies Enabling Development of; Clinical Therapeutics and Diagnostics; School of Pharmacy; Tianjin Medical University; Tianjin 300070 P.R. China
| | - Wenbo Liu
- Tianjin Key Laboratory on Technologies Enabling Development of; Clinical Therapeutics and Diagnostics; School of Pharmacy; Tianjin Medical University; Tianjin 300070 P.R. China
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry; Hungarian Academy of Sciences and; Department of Physics; Budapest University of Technology and Economics; Budafoki ut 8 1111 Budapest Hungary
| | - Frederick A. Villamena
- Department of Biological Chemistry and Pharmacology; College of Medicine; The Ohio State University; Columbus OH 43210 USA
| | - Jay L. Zweier
- Center for Biomedical EPR Spectroscopy and Imaging; The Davis Heart and Lung Research Institute; Division of Cardiovascular Medicine; Department of Internal Medicine; The Ohio State University; Columbus OH 43210 USA
| | - Yuguang Song
- Tianjin Key Laboratory on Technologies Enabling Development of; Clinical Therapeutics and Diagnostics; School of Pharmacy; Tianjin Medical University; Tianjin 300070 P.R. China
| | - Yangping Liu
- Tianjin Key Laboratory on Technologies Enabling Development of; Clinical Therapeutics and Diagnostics; School of Pharmacy; Tianjin Medical University; Tianjin 300070 P.R. China
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19
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Poulhès F, Rizzato E, Bernasconi P, Rosas R, Viel S, Jicsinszky L, Rockenbauer A, Bardelang D, Siri D, Gaudel-Siri A, Karoui H, Hardy M, Ouari O. Synthesis and properties of a series of β-cyclodextrin/nitrone spin traps for improved superoxide detection. Org Biomol Chem 2018; 15:6358-6366. [PMID: 28715016 DOI: 10.1039/c7ob00961e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Three new DEPMPO-based spin traps have been designed and synthesized for improved superoxide detection, each carrying a cyclodextrin (CD) moiety but with a different alkyl chain on the phosphorus atom or with a long spacer arm. EPR spectroscopy allowed us to estimate the half-life of the superoxide spin adducts which is close to the value previously reported for CD-DEPMPO (t1/2 ≈ 50-55 min under the conditions investigated). The spectra are typical of superoxide adducts (almost no features of the HO˙ adduct that usually forms with time for other nitrone spin traps such as DMPO) and we show that at 250 μM, the new spin trap enables the reliable detection of superoxide by 1 scan at the position opposite to the corresponding spin trap without the CD moiety. The resistance of the spin adducts to a reduction process has been evaluated, and the superoxide spin adducts are sensitive to ascorbate and glutathione (GSH), but not to glutathione peroxidase/GSH, reflecting the exposed nature of the nitroxide moiety to the bulk solvent. To understand these results, 2D-ROESY NMR studies and molecular dynamics pointed to a shallow or surface self-inclusion of the nitrone spin traps and of nitroxide spin adducts presumably due to the high flexibility of the permethyl-β-CD rim.
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Affiliation(s)
- Florent Poulhès
- Aix Marseille Univ, CNRS, ICR, UMR 7273, SREP, 13013 Marseille, France
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20
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Tan X, Chen L, Song Y, Rockenbauer A, Villamena FA, Zweier JL, Liu Y. Thiol-Dependent Reduction of the Triester and Triamide Derivatives of Finland Trityl Radical Triggers O2-Dependent Superoxide Production. Chem Res Toxicol 2017; 30:1664-1672. [DOI: 10.1021/acs.chemrestox.7b00086] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Xiaoli Tan
- Tianjin
Key Laboratory on Technologies Enabling Development of Clinical Therapeutics
and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China
| | - Li Chen
- Tianjin
Key Laboratory on Technologies Enabling Development of Clinical Therapeutics
and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China
| | - Yuguang Song
- Tianjin
Key Laboratory on Technologies Enabling Development of Clinical Therapeutics
and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China
| | - Antal Rockenbauer
- Institute
of Materials and Environmental Chemistry, Hungarian Academy of Sciences,
Department of Physics, Budapest University of Technology and Economics, Budafoki ut 8, 1111 Budapest, Hungary
| | - Frederick A. Villamena
- Department
of Biological Chemistry and Pharmacology, College of Medicine, The Ohio State University, Columbus, Ohio 43210, United States
| | - Jay L. Zweier
- Center
for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung
Research Institute, The Division of Cardiovascular Medicine, Department
of Internal Medicine, The Ohio State University, Columbus, Ohio 43210, United States
| | - Yangping Liu
- Tianjin
Key Laboratory on Technologies Enabling Development of Clinical Therapeutics
and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China
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21
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Tóth EN, May NV, Rockenbauer A, Peintler G, Gyurcsik B. Exploring the boundaries of direct detection and characterization of labile isomers - a case study of copper(ii)-dipeptide systems. Dalton Trans 2017; 46:8157-8166. [PMID: 28607997 DOI: 10.1039/c7dt00884h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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
The investigation of the linkage isomers of biologically essential and kinetically labile metal complexes in aqueous solutions poses a challenge, as these microspecies cannot be separately studied. Therefore, derivatives are commonly used to initially determine the stability or spectral characteristics of at least one of the isomers. Here we directly detect the isomers, describe the metal ion coordination sphere, speciation and thermodynamic parameters by a synergistic application of temperature dependent EPR and CD spectroscopic measurements in copper(ii)-dipeptide systems including His-Gly and His-Ala ligands. The ΔH = (-23 ± 4) kJ mol-1 value of the standard enthalpy change corresponding to the peptide-type to histamine-type isomerisation equilibrium of the [CuL]+ complex was corroborated by several techniques. The preferential coordination of the side-chains was observed at lower temperatures, whereas, metal-binding of the backbone atoms became favourable upon increasing temperature. This study exemplifies the necessity of using temperature dependent multiple methodologies for a reliable description of similar systems for upstream applications.
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Affiliation(s)
- Eszter N Tóth
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary. and PhD Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, Japan
| | - Nóra V May
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1117 Budapest, Magyar tudósok körútja 2, Hungary
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1117 Budapest, Magyar tudósok körútja 2, Hungary and Department of Physics, Budapest University of Technology and Economics and MTA-BME Lendület Spintronics Research Group (PROSPIN), P.O. Box 91, H-1521 Budapest, Hungary
| | - Gábor Peintler
- Department of Physical Chemistry and Material Sciences, University of Szeged, Aradi Vértanuk tere 1, H-6720 Szeged, Hungary
| | - Béla Gyurcsik
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary.
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22
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Thétiot-Laurent S, Gosset G, Clément JL, Cassien M, Mercier A, Siri D, Gaudel-Siri A, Rockenbauer A, Culcasi M, Pietri S. New Amino-Acid-Based β-Phosphorylated Nitroxides for Probing Acidic pH in Biological Systems by EPR Spectroscopy. Chembiochem 2016; 18:300-315. [DOI: 10.1002/cbic.201600550] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Indexed: 01/06/2023]
Affiliation(s)
- Sophie Thétiot-Laurent
- Aix Marseille Univ; CNRS; ICR; UMR 7273; Avenue Escadrile Normandie Niemen 13397 Marseille France
| | - Gaëlle Gosset
- Aix Marseille Univ; CNRS; ICR; UMR 7273; Avenue Escadrile Normandie Niemen 13397 Marseille France
| | - Jean-Louis Clément
- Aix Marseille Univ; CNRS; ICR; UMR 7273; Avenue Escadrile Normandie Niemen 13397 Marseille France
| | - Mathieu Cassien
- Aix Marseille Univ; CNRS; ICR; UMR 7273; Avenue Escadrile Normandie Niemen 13397 Marseille France
| | - Anne Mercier
- Aix Marseille Univ; CNRS; ICR; UMR 7273; Avenue Escadrile Normandie Niemen 13397 Marseille France
| | - Didier Siri
- Aix Marseille Univ; CNRS; ICR; UMR 7273; Avenue Escadrile Normandie Niemen 13397 Marseille France
| | - Anouk Gaudel-Siri
- Aix Marseille Univ; CNRS; ICR; UMR 7273; Avenue Escadrile Normandie Niemen 13397 Marseille France
| | - Antal Rockenbauer
- Research Centre for Natural Sciences of the Hungarian Academy of Sciences; Institute of Materials and Environmental Chemistry; Budapest University of Technology and Economics; 1117 Budapest Hungary
| | - Marcel Culcasi
- Aix Marseille Univ; CNRS; ICR; UMR 7273; Avenue Escadrile Normandie Niemen 13397 Marseille France
| | - Sylvia Pietri
- Aix Marseille Univ; CNRS; ICR; UMR 7273; Avenue Escadrile Normandie Niemen 13397 Marseille France
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23
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Zane A, Zuo R, Villamena FA, Rockenbauer A, Digeorge Foushee AM, Flores K, Dutta PK, Nagy A. Biocompatibility and antibacterial activity of nitrogen-doped titanium dioxide nanoparticles for use in dental resin formulations. Int J Nanomedicine 2016; 11:6459-6470. [PMID: 27980404 PMCID: PMC5147409 DOI: 10.2147/ijn.s117584] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The addition of antibacterial functionality to dental resins presents an opportunity to extend their useful lifetime by reducing secondary caries caused by bacterial recolonization. In this study, the potential efficacy of nitrogen-doped titanium dioxide nanoparticles for this purpose was determined. Nitrogen doping was carried out to extend the ultraviolet absorbance into longer wavelength blue light for increased biocompatibility. Titanium dioxide nanoparticles (approximately 20-30 nm) were synthesized with and without nitrogen doping using a sol-gel method. Ultraviolet-Visible spectroscopy indicated a band of trap states, with increasing blue light absorbance as the concentration of the nitrogen dopant increased. Electron paramagnetic resonance measurements indicated the formation of superoxide and hydroxyl radicals upon particle exposure to visible light and oxygen. The particles were significantly toxic to Escherichia coli in a dose-dependent manner after a 1-hour exposure to a blue light source (480 nm). Intracellular reactive oxygen species assay demonstrated that the particles caused a stress response in human gingival epithelial cells when exposed to 1 hour of blue light, though this did not result in detectable release of cytokines. No decrease in cell viability was observed by water-soluble tetrazolium dye assay. The results show that nitrogen-doped titanium dioxide nanoparticles have antibacterial activity when exposed to blue light, and are biocompatible at these concentrations.
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Affiliation(s)
- Andrew Zane
- Biomaterials and Environmental Surveillance Department, Naval Medical Research Unit San Antonio, Joint Base San Antonio, Fort Sam Houston, San Antonio, TX
| | | | - Frederick A Villamena
- Department of Biological Chemistry and Pharmacology, Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - Antal Rockenbauer
- Research Centre for Natural Sciences of the Hungarian Academy of Sciences, Institute of Materials and Environmental Chemistry; Department of Physics, MTA-BME Condensed Matter Research Group, Budapest University of Technology and Economics, Budapest, Hungary
| | - Ann Marie Digeorge Foushee
- Biomaterials and Environmental Surveillance Department, Naval Medical Research Unit San Antonio, Joint Base San Antonio, Fort Sam Houston, San Antonio, TX
| | - Kristin Flores
- Biomaterials and Environmental Surveillance Department, Naval Medical Research Unit San Antonio, Joint Base San Antonio, Fort Sam Houston, San Antonio, TX
| | | | - Amber Nagy
- Biomaterials and Environmental Surveillance Department, Naval Medical Research Unit San Antonio, Joint Base San Antonio, Fort Sam Houston, San Antonio, TX
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24
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Sauvée C, Casano G, Abel S, Rockenbauer A, Akhmetzyanov D, Karoui H, Siri D, Aussenac F, Maas W, Weber RT, Prisner T, Rosay M, Tordo P, Ouari O. Tailoring of Polarizing Agents in the bTurea Series for Cross-Effect Dynamic Nuclear Polarization in Aqueous Media. Chemistry 2016; 22:5598-606. [PMID: 26992052 DOI: 10.1002/chem.201504693] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2015] [Indexed: 11/10/2022]
Abstract
A series of 18 nitroxide biradicals derived from bTurea has been prepared, and their enhancement factors ɛ ((1)H) in cross-effect dynamic nuclear polarization (CE DNP) NMR experiments at 9.4 and 14.1 T and 100 K in a DNP-optimized glycerol/water matrix ("DNP juice") have been studied. We observe that ɛ ((1)H) is strongly correlated with the substituents on the polarizing agents, and its trend is discussed in terms of different molecular parameters: solubility, average e-e distance, relative orientation of the nitroxide moieties, and electron spin relaxation times. We show that too short an e-e distance or too long a T1e can dramatically limit ɛ ((1)H). Our study also shows that the molecular structure of AMUPol is not optimal and its ɛ ((1)H) could be further improved through stronger interaction with the glassy matrix and a better orientation of the TEMPO moieties. A new AMUPol derivative introduced here provides a better ɛ ((1)H) than AMUPol itself (by a factor of ca. 1.2).
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Affiliation(s)
- Claire Sauvée
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397, Marseille cedex 20, France
| | - Gilles Casano
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397, Marseille cedex 20, France
| | - Sébastien Abel
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397, Marseille cedex 20, France
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences, Department of Physics, Budapest University of Technology and Economics and MTA-BME Condensed Matter Research Group, Budafoki ut 8, 1111, Budapest, Hungary
| | - Dimitry Akhmetzyanov
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue Str. 7, 60438, Frankfurt-am-Main, Germany
| | - Hakim Karoui
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397, Marseille cedex 20, France
| | - Didier Siri
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397, Marseille cedex 20, France
| | - Fabien Aussenac
- Bruker BioSpin S.A.S., 34 rue de l'industrie, 67166, Wissembourg, France
| | - Werner Maas
- Bruker BioSpin Corporation, 15 Fortune Drive, Billerica, Massachusetts, 01821, USA
| | - Ralph T Weber
- Bruker BioSpin Corporation, 15 Fortune Drive, Billerica, Massachusetts, 01821, USA
| | - Thomas Prisner
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue Str. 7, 60438, Frankfurt-am-Main, Germany
| | - Mélanie Rosay
- Bruker BioSpin Corporation, 15 Fortune Drive, Billerica, Massachusetts, 01821, USA
| | - Paul Tordo
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397, Marseille cedex 20, France.
| | - Olivier Ouari
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397, Marseille cedex 20, France.
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25
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Tan X, Song Y, Liu H, Zhong Q, Rockenbauer A, Villamena FA, Zweier JL, Liu Y. Supramolecular host-guest interaction of trityl-nitroxide biradicals with cyclodextrins: modulation of spin-spin interaction and redox sensitivity. Org Biomol Chem 2016; 14:1694-701. [PMID: 26700002 DOI: 10.1039/c5ob02450a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Supramolecular host-guest interactions of trityl-nitroxide (TN) biradicals CT02-VT, CT02-AT and CT02-GT with methyl-β-cyclodextrin (M-β-CD), hydroxypropyl-β-cyclodextrin (H-β-CD) and γ-cyclodextrin (γ-CD) were investigated by EPR spectroscopy. In the presence of cyclodextrins (i.e., γ-CD, M-β-CD and H-β-CD), host-guest complexes of CT02-VT are formed where the nitroxide and linker parts possibly interact with the cyclodextrins' cavities. Complexation with cyclodextrins leads to suppression of the intramolecular through-space spin-spin exchange coupling in CT02-VT, thus allowing the determination of the through-bond spin-spin exchange coupling which was calculated to be 1.6 G using EPR simulations. Different types of cyclodextrins have different binding affinities with CT02-VT in the order of γ-CD (95 M(-1)) > M-β-CD (70 M(-1)) > H-β-CD (32 M(-1)). In addition, the effect of the linkers in TN biradicals on the host-guest interactions was also investigated. Among the three TN biradicals studied, CT02-VT has the highest association constant with one designated cyclodextrin derivative. On the other hand, the complexes of CT02-GT (∼ 22 G) and CT02-AT (7.7-9.0 G) with cyclodextrins have much higher through-bond spin-spin exchange couplings than those of CT02-VT (1.6 G) due to the shorter linkers than those of CT02-VT. Furthermore, the stability of TN biradicals towards ascorbate was significantly enhanced after the complexation with CDs, with an almost 2-fold attenuation of the second-order rate constants for all the biradicals. Therefore, the supramolecular host-guest interactions with cyclodextrins will be an alternative method to modulate the magnitude of the spin-spin interactions and redox sensitivity of TN biradicals, and the resulting complexes are promising as highly efficient DNP polarizing agents as well as EPR redox probes.
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Affiliation(s)
- Xiaoli Tan
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China.
| | - Yuguang Song
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China.
| | - Huiqiang Liu
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China.
| | - Qinwen Zhong
- The First Affiliated Hospital, Gannan Medical University, Jiangxi 341000, P. R. China.
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences and, Department of Physics, Budapest University of Technology and Economics, Budafoki ut 8, 1111 Budapest, Hungary
| | - Frederick A Villamena
- Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, THE Division of Cardiovascular Medicine, Department of Internal Medicine, The Ohio State University, Columbus, Ohio 43210, USA. and Department of Pharmacology, College of Medicine, The Ohio State University, Columbus, Ohio 43210, USA
| | - Jay L Zweier
- Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, THE Division of Cardiovascular Medicine, Department of Internal Medicine, The Ohio State University, Columbus, Ohio 43210, USA.
| | - Yangping Liu
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China. and Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, THE Division of Cardiovascular Medicine, Department of Internal Medicine, The Ohio State University, Columbus, Ohio 43210, USA.
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26
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Ayhan MM, Karoui H, Hardy M, Rockenbauer A, Charles L, Rosas R, Udachin K, Tordo P, Bardelang D, Ouari O. Correction to "Comprehensive Synthesis of Monohydroxy-Cucurbit[n]urils (n = 5, 6, 7, 8): High Purity and High Conversions". J Am Chem Soc 2016; 138:2060. [PMID: 26839971 DOI: 10.1021/jacs.6b00188] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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27
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Ayhan MM, Casano G, Karoui H, Rockenbauer A, Monnier V, Hardy M, Tordo P, Bardelang D, Ouari O. Frontispiece: EPR Studies of the Binding Properties, Guest Dynamics, and Inner‐Space Dimensions of a Water‐Soluble Resorcinarene Capsule. Chemistry 2015. [DOI: 10.1002/chem.201584662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Mehmet Menaf Ayhan
- Aix‐Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
- Department of Chemistry, Gebze Technical University, P.K.:141, 41400 Gebze, Kocaeli (Turkey)
| | - Gilles Casano
- Aix‐Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - Hakim Karoui
- Aix‐Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences and, Department of Physics, Budapest University of Technology and Economics, Budafoki ut 8, 1111 Budapest (Hungary)
| | - Valérie Monnier
- Aix‐Marseille Université, CNRS, Spectropole, FR 1739, 13013 Marseille (France)
| | - Micaël Hardy
- Aix‐Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - Paul Tordo
- Aix‐Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - David Bardelang
- Aix‐Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - Olivier Ouari
- Aix‐Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
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28
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Ayhan MM, Casano G, Karoui H, Rockenbauer A, Monnier V, Hardy M, Tordo P, Bardelang D, Ouari O. EPR Studies of the Binding Properties, Guest Dynamics, and Inner-Space Dimensions of a Water-Soluble Resorcinarene Capsule. Chemistry 2015; 21:16404-10. [PMID: 26403999 DOI: 10.1002/chem.201502212] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Indexed: 12/11/2022]
Abstract
Nitroxide free radicals have been used to study the inner space of one of Rebek's water-soluble capsules. EPR and (1) H NMR spectroscopy, ESI-MS, and DFT calculations showed a preference for the formation of 1:2 complexes. EPR titrations allowed us to determine binding constants (Ka ) in the order of 10(7) M(-2) . EPR spectral-shape analysis provided information on the guest rotational dynamics within the capsule. The interplay between optimum hydrogen bonding upon capsule formation and steric strain for guest accommodation highlights some degree of flexibility for guest inclusion, particularly at the center of the capsule where the hydrogen bond seam can be barely distorted or slightly disturbed.
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Affiliation(s)
- Mehmet Menaf Ayhan
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France).,Department of Chemistry, Gebze Technical University, P.K.:141, 41400 Gebze, Kocaeli (Turkey)
| | - Gilles Casano
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - Hakim Karoui
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences and, Department of Physics, Budapest University of Technology and Economics, Budafoki ut 8, 1111 Budapest (Hungary)
| | - Valérie Monnier
- Aix-Marseille Université, CNRS, Spectropole, FR 1739, 13013 Marseille (France)
| | - Micaël Hardy
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - Paul Tordo
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - David Bardelang
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - Olivier Ouari
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France).
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29
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Ayhan MM, Karoui H, Hardy M, Rockenbauer A, Charles L, Rosas R, Udachin K, Tordo P, Bardelang D, Ouari O. Comprehensive Synthesis of Monohydroxy-Cucurbit[n]urils (n = 5, 6, 7, 8): High Purity and High Conversions. J Am Chem Soc 2015. [PMID: 26197228 DOI: 10.1021/jacs.5b04553] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We describe a photochemical method to introduce a single alcohol function directly on cucurbit[n]urils (n = 5, 6, 7, 8) with conversions of the order 95-100% using hydrogen peroxide and UV light. The reaction was easily scaled up to 1 g for CB[6] and CB[7]. Spin trapping of cucurbituril radicals combined with MS experiments allowed us to get insights about the reaction mechanism and characterize CB[5], CB[6], CB[7], and CB[8] monofunctional compounds. Experiments involving (18)O isotopically labeled water indicated that the mechanism was complex and showed signs of both radical and ionic intermediates. DFT calculations allowed estimating the Bond Dissociation Energies (BDEs) of each hydrogen atom type in the CB series, providing an explanation of the higher reactivity of the "equatorial" C-H position of CB[n] compounds. These results also showed that, for CB[8], direct functionalization on the cucurbituril skeleton is more difficult because one of the methylene hydrogen atoms (Hb) has its BDE lowering within the series and coming close to that of Hc, thus opening the way to other types of free radicals generated on the CB[8] skeleton leading to several side products. Yet CB[5]-(OH)1 and CB[8]-(OH)1, the first CB[8] derivative, were obtained in excellent yields thanks to the soft method presented here.
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Affiliation(s)
- Mehmet M Ayhan
- †Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France.,‡Department of Chemistry, Gebze Technical University, P.K.:141, 41400 Gebze, Kocaeli, Turkey
| | - Hakim Karoui
- †Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Micaël Hardy
- †Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Antal Rockenbauer
- § Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences, Department of Physics, Budapest University of Technology and Economics, Budafoki ut 8, 1111 Budapest, Hungary
| | - Laurence Charles
- †Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Roselyne Rosas
- ∥Aix-Marseille Université, CNRS, Spectropole, FR 1739, 13013 Marseille, France
| | - Konstantin Udachin
- ⊥National Research Council Canada, 100 Sussex Drive, Ottawa, ON K1A 0R6, Canada
| | - Paul Tordo
- †Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - David Bardelang
- †Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Olivier Ouari
- †Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
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30
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Casano G, Poulhès F, Tran TK, Ayhan MM, Karoui H, Siri D, Gaudel-Siri A, Rockenbauer A, Jeschke G, Bardelang D, Tordo P, Ouari O. High binding yet accelerated guest rotation within a cucurbit[7]uril complex. Toward paramagnetic gyroscopes and rolling nanomachines. Nanoscale 2015; 7:12143-12150. [PMID: 26123621 DOI: 10.1039/c5nr03288a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The (15-oxo-3,7,11-triazadispiro[5.1.5.3]hexadec-7-yl)oxidanyl, a bis-spiropiperidinium nitroxide derived from TEMPONE, can be included in cucurbit[7]uril to form a strong (K(a)∼ 2 × 10(5) M(-1)) CB[7]@bPTO complex. EPR and MS spectra, DFT calculations, and unparalleled increased resistance (a factor of ∼10(3)) toward ascorbic acid reduction show evidence of deep inclusion of bPTO inside CB[7]. The unusual shape of the CB[7]@bPTO EPR spectrum can be explained by an anisotropic Brownian rotational diffusion, the global tumbling of the complex being slower than rotation of bPTO around its "long molecular axis" inside CB[7]. The CB[7] (stator) with the encapsulated bPTO (rotator) behaves as a supramolecular paramagnetic rotor with increased rotational speed of the rotator that has great potential for advanced nanoscale machines requiring wheels such as cucurbiturils with virtually no friction between the wheel and the axle for optimum wheel rotation (i.e. nanopulleys and nanocars).
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Affiliation(s)
- G Casano
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille, France.
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31
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Das A, Gopalakrishnan B, Druhan LJ, Wang TY, De Pascali F, Rockenbauer A, Racoma I, Varadharaj S, Zweier JL, Cardounel AJ, Villamena FA. Reversal of SIN-1-induced eNOS dysfunction by the spin trap, DMPO, in bovine aortic endothelial cells via eNOS phosphorylation. Br J Pharmacol 2014; 171:2321-34. [PMID: 24405159 DOI: 10.1111/bph.12572] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 12/03/2013] [Accepted: 12/18/2013] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND AND PURPOSE Nitric oxide (NO) derived from eNOS is mostly responsible for the maintenance of vascular homeostasis and its decreased bioavailability is characteristic of reactive oxygen species (ROS)-induced endothelial dysfunction (ED). Because 5,5-dimethyl-1-pyrroline-N-oxide (DMPO), a commonly used spin trap, can control intracellular nitroso-redox balance by scavenging ROS and donating NO, it was employed as a cardioprotective agent against ED but the mechanism of its protection is still not clear. This study elucidated the mechanism of protection by DMPO against SIN-1-induced oxidative injury to bovine aortic endothelial cells (BAEC). EXPERIMENTAL APPROACH BAEC were treated with SIN-1, as a source of peroxynitrite anion (ONOO⁻), and then incubated with DMPO. Cytotoxicity following SIN-1 alone and cytoprotection by adding DMPO was assessed by MTT assay. Levels of ROS and NO generation from HEK293 cells transfected with wild-type and mutant eNOS cDNAs, tetrahydrobiopterin bioavailability, eNOS activity, eNOS and Akt kinase phosphorylation were measured. KEY RESULTS Post-treatment of cells with DMPO attenuated SIN-1-mediated cytotoxicity and ROS generation, restoration of NO levels via increased in eNOS activity and phospho-eNOS levels. Treatment with DMPO alone significantly increased NO levels and induced phosphorylation of eNOS Ser¹¹⁷⁹ via Akt kinase. Transfection studies with wild-type and mutant human eNOS confirmed the dual role of eNOS as a producer of superoxide anion (O₂⁻) with SIN-1 treatment, and a producer of NO in the presence of DMPO. CONCLUSION AND IMPLICATIONS Post-treatment with DMPO of oxidatively challenged cells reversed eNOS dysfunction and could have pharmacological implications in the treatment of cardiovascular diseases.
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Affiliation(s)
- Amlan Das
- Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, OH, USA
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Bardelang D, Casano G, Poulhès F, Karoui H, Filippini J, Rockenbauer A, Rosas R, Monnier V, Siri D, Gaudel-Siri A, Ouari O, Tordo P. Spin Exchange Monitoring of the Strong Positive Homotropic Allosteric Binding of a Tetraradical by a Synthetic Receptor in Water. J Am Chem Soc 2014; 136:17570-7. [DOI: 10.1021/ja509586k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- David Bardelang
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Gilles Casano
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Florent Poulhès
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Hakim Karoui
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Jessica Filippini
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Antal Rockenbauer
- Department of Physics, Budapest University of Technology and Economics and MTA-BME Condensed Matter Research Group, Budafoki ut 8, 1111 Budapest, Hungary
| | - Roselyne Rosas
- Aix-Marseille Université, CNRS, Spectropole, FR 1739, 13013 Marseille, France
| | - Valérie Monnier
- Aix-Marseille Université, CNRS, Spectropole, FR 1739, 13013 Marseille, France
| | - Didier Siri
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Anouk Gaudel-Siri
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Olivier Ouari
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Paul Tordo
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
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Hardy M, Poulhés F, Rizzato E, Rockenbauer A, Banaszak K, Karoui H, Lopez M, Zielonka J, Vasquez-Vivar J, Sethumadhavan S, Kalyanaraman B, Tordo P, Ouari O. Mitochondria-targeted spin traps: synthesis, superoxide spin trapping, and mitochondrial uptake. Chem Res Toxicol 2014; 27:1155-65. [PMID: 24890552 DOI: 10.1021/tx500032e] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Development of reliable methods and site-specific detection of free radicals is an active area of research. Here, we describe the synthesis and radical-trapping properties of new derivatives of DEPMPO and DIPPMPO, bearing a mitochondria-targeting triphenylphosphonium cationic moiety or guanidinium cationic group. All of the spin traps prepared have been observed to efficiently trap superoxide radical anions in a cell-free system. The superoxide spin adducts exhibited similar spectral properties, indicating no significant differences in the geometry of the cyclic nitroxide moieties of the spin adducts. The superoxide adduct stability was measured and observed to be highest (t1/2 = 73 min) for DIPPMPO nitrone linked to triphenylphosphonium moiety via a short carbon chain (Mito-DIPPMPO). The experimental results and DFT quantum chemical calculations indicate that the cationic property of the triphenylphosphonium group may be responsible for increased superoxide trapping efficiency and adduct stability of Mito-DIPPMPO, as compared to the DIPPMPO spin trap. The studies of uptake of the synthesized traps into isolated mitochondria indicated the importance of both cationic and lipophilic properties, with the DEPMPO nitrone linked to the triphenylphosphonium moiety via a long carbon chain (Mito10-DEPMPO) exhibiting the highest mitochondrial uptake. We conclude that, of the synthesized traps, Mito-DIPPMPO and Mito10-DEPMPO are the best candidates for potential mitochondria-specific spin traps for use in biologically relevant systems.
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Affiliation(s)
- Micael Hardy
- Aix Marseille Université , CNRS, ICR UMR 7273, 13397 Marseille, France
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Zamora PL, Rockenbauer A, Villamena FA. Radical Model of Arsenic(III) Toxicity: Theoretical and EPR Spin Trapping Studies. Chem Res Toxicol 2014; 27:765-74. [DOI: 10.1021/tx4004227] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Pedro L. Zamora
- Department
of Pharmacology, The Davis Heart and Lung Research Institute, College
of Medicine, The Ohio State University, Columbus, Ohio 43210, United States
| | - Antal Rockenbauer
- Department
of Physics, Budapest University of Technology and Economics and MTA-BME Condensed Matter Research Group, Budafoki ut 8, 1111 Budapest, Hungary
| | - Frederick A. Villamena
- Department
of Pharmacology, The Davis Heart and Lung Research Institute, College
of Medicine, The Ohio State University, Columbus, Ohio 43210, United States
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35
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Karoui H, Nsanzumuhire C, Le Moigne F, Hardy M, Siri D, Derat E, Rockenbauer A, Ouari O, Tordo P. Synthesis and spin-trapping properties of a trifluoromethyl analogue of DMPO: 5-methyl-5-trifluoromethyl-1-pyrroline N-oxide (5-TFDMPO). Chemistry 2014; 20:4064-71. [PMID: 24590621 DOI: 10.1002/chem.201303774] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Indexed: 11/05/2022]
Abstract
The 5-diethoxyphosphonyl-5-methyl-1-pyrroline N-oxide superoxide spin adduct (DEPMPO-OOH) is much more persistent (about 15 times) than the 5,5-dimethyl-1-pyrroline N-oxide superoxide spin adduct (DMPO-OOH). The diethoxyphosphonyl group is bulkier than the methyl group and its electron-withdrawing effect is much stronger. These two factors could play a role in explaining the different half-lifetimes of DMPO-OOH and DEPMPO-OOH. The trifluoromethyl and the diethoxyphosphonyl groups show similar electron-withdrawing effects but have different sizes. We have thus synthesized and studied 5-methyl-5-trifluoromethyl-1-pyrroline N-oxide (5-TFDMPO), a new trifluoromethyl analogue of DMPO, to compare its spin-trapping performance with those of DMPO and DEPMPO. 5-TFDMPO was prepared in a five-step sequence by means of the Zn/AcOH reductive cyclization of 5,5,5-trifluoro-4-methyl-4-nitropentanal, and the geometry of the molecule was estimated by using DFT calculations. The spin-trapping properties were investigated both in toluene and in aqueous buffer solutions for oxygen-, sulfur-, and carbon-centered radicals. All the spin adducts exhibit slightly different fluorine hyperfine coupling constants, thereby suggesting a hindered rotation of the trifluoromethyl group, which was confirmed by variable-temperature EPR studies and DFT calculations. In phosphate buffer at pH 7.4, the half-life of 5-TFDMPOOOH is about three times shorter than for DEPMPO-OOH and five times longer than for DMPO-OOH. Our results suggest that the stabilization of the superoxide adducts comes from a delicate balance between steric, electronic, and hydrogen-bonding effects that involve the β group, the hydroperoxyl moiety, and the nitroxide.
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Affiliation(s)
- Hakim Karoui
- Aix-Marseille Université, CNRS UMR7273, Institut de Chimie Radicalaire (ICR), Case 521, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20 (France), Fax: (+33) 491-288-758
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Bézière N, Hardy M, Poulhès F, Karoui H, Tordo P, Ouari O, Frapart YM, Rockenbauer A, Boucher JL, Mansuy D, Peyrot F. Metabolic stability of superoxide adducts derived from newly developed cyclic nitrone spin traps. Free Radic Biol Med 2014; 67:150-8. [PMID: 24161442 DOI: 10.1016/j.freeradbiomed.2013.10.812] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2013] [Revised: 09/20/2013] [Accepted: 10/16/2013] [Indexed: 11/24/2022]
Abstract
Reactive oxygen species are by-products of aerobic metabolism involved in the onset and evolution of various pathological conditions. Among them, the superoxide radical is of special interest as the origin of several damaging species such as H2O2, hydroxyl radical, or peroxynitrite (ONOO(-)). Spin trapping coupled with ESR is a method of choice to characterize these species in chemical and biological systems and the metabolic stability of the spin adducts derived from reaction of superoxide and hydroxyl radicals with nitrones is the main limit to the in vivo application of the method. Recently, new cyclic nitrones bearing a triphenylphosphonium or permethylated β-cyclodextrin moiety have been synthesized and their spin adducts demonstrated increased stability in buffer. In this article, we studied the stability of the superoxide adducts of four new cyclic nitrones in the presence of liver subcellular fractions and biologically relevant reductants using an original setup combining a stopped-flow device and an ESR spectrometer. The kinetics of disappearance of the spin adducts were analyzed using an appropriate simulation program. Our results highlight the interest of the new spin trapping agents CD-DEPMPO and CD-DIPPMPO for specific detection of superoxide with high stability of the superoxide adducts in the presence of liver microsomes.
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Affiliation(s)
- Nicolas Bézière
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), Université Paris Descartes, 75006 Paris, France
| | - Micael Hardy
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille Cedex 20, France
| | - Florent Poulhès
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille Cedex 20, France
| | - Hakim Karoui
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille Cedex 20, France
| | - Paul Tordo
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille Cedex 20, France
| | - Olivier Ouari
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille Cedex 20, France
| | - Yves-Michel Frapart
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), Université Paris Descartes, 75006 Paris, France
| | - Antal Rockenbauer
- Institute of Molecular Pharmacology, Research Centre for Natural Sciences, Budapest, Hungary
| | - Jean-Luc Boucher
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), Université Paris Descartes, 75006 Paris, France
| | - Daniel Mansuy
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), Université Paris Descartes, 75006 Paris, France
| | - Fabienne Peyrot
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), Université Paris Descartes, 75006 Paris, France; IUFM de Paris, Université Paris Sorbonne, 75016 Paris, France.
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37
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Abstract
Average geometries of the nitroxide adducts of various radicals with three substituted DEPMPO nitrones allow the prediction of a correlation between the substitution and the trapping properties.
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Affiliation(s)
- Florence Chalier
- Laboratoire SREP
- Institut de Chimie Radicalaire – UMR 7273
- CNRS and Aix-Marseille Univ. – case 521
- Centre de Saint Jérôme
- , France
| | - Jean-Louis Clément
- Laboratoire SREP
- Institut de Chimie Radicalaire – UMR 7273
- CNRS and Aix-Marseille Univ. – case 521
- Centre de Saint Jérôme
- , France
| | - Micaël Hardy
- Laboratoire SREP
- Institut de Chimie Radicalaire – UMR 7273
- CNRS and Aix-Marseille Univ. – case 521
- Centre de Saint Jérôme
- , France
| | - Paul Tordo
- Laboratoire SREP
- Institut de Chimie Radicalaire – UMR 7273
- CNRS and Aix-Marseille Univ. – case 521
- Centre de Saint Jérôme
- , France
| | - Antal Rockenbauer
- Research Centre for Natural Sciences
- Institute for Molecular Pharmacology
- H-1525 Budapest, Hungary
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38
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Du L, Huang S, Zhuang Q, Jia H, Rockenbauer A, Liu Y, Liu KJ, Liu Y. Highly sensitive free radical detection by nitrone-functionalized gold nanoparticles. Nanoscale 2014; 6:1646-1652. [PMID: 24336899 DOI: 10.1039/c3nr04559e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The detection of free radicals and related species has attracted significant attention in recent years because of their critical roles in physiological and pathological processes. Among the methods for the detection of free radicals, electron spin resonance (ESR) coupled with the use of the spin trapping technique has been an effective approach for characterization and quantification of these species due to its high specificity. However, its application in biological systems, especially in in vivo systems, has been greatly limited partially due to the low reaction rate between the currently available spin traps with biological radicals. To overcome this drawback, we herein report the first example of nitrone functionalized gold nanoparticles (Au@EMPO) as highly efficient spin traps in which the thiolated EMPO (2-(ethoxycarbonyl)-2-methyl-3,4-dihydro-2H-pyrrole 1-oxide) derivative was self-assembled on gold nanoparticles. Kinetic studies showed that Au@EMPO has a 137-fold higher reaction rate constant with ˙OH than PBN (N-tert-butyl-α-phenylnitrone). Owing to the high rate of trapping ˙OH by Au@EMPO as well as the high stability of the resulting spin adduct (t½ ∼ 56 min), Au@EMPO affords 124-fold higher sensitivity for ˙OH than EMPO. Thus, this new nanospin trap shows great potential in trapping the important radicals such as ˙OH in various biological systems and provides a novel strategy to design spin traps with much improved properties.
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Affiliation(s)
- Libo Du
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Centre for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P.R. China.
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Breton NL, Martinho M, Kabytaev K, Topin J, Mileo E, Blocquel D, Habchi J, Longhi S, Rockenbauer A, Golebiowski J, Guigliarelli B, Marque SRA, Belle V. Diversification of EPR signatures in site directed spin labeling using a β-phosphorylated nitroxide. Phys Chem Chem Phys 2014; 16:4202-9. [DOI: 10.1039/c3cp54816c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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40
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Bacher F, Enyedy ÉA, Nagy NV, Rockenbauer A, Bognár GM, Trondl R, Novak MS, Klapproth E, Kiss T, Arion VB. Copper(II) complexes with highly water-soluble L- and D-proline-thiosemicarbazone conjugates as potential inhibitors of Topoisomerase IIα. Inorg Chem 2013; 52:8895-908. [PMID: 23829568 DOI: 10.1021/ic401079w] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Two proline-thiosemicarbazone bioconjugates with excellent aqueous solubility, namely, 3-methyl-(S)-pyrrolidine-2-carboxylate-2-formylpyridine thiosemicarbazone [L-Pro-FTSC or (S)-H2L] and 3-methyl-(R)-pyrrolidine-2-carboxylate-2-formylpyridine thiosemicarbazone [D-Pro-FTSC or (R)-H2L], have been synthesized and characterized by elemental analysis, one- and two-dimensional (1)H and (13)C NMR spectroscopy, and electrospray ionization mass spectrometry. The complexation behavior of L-Pro-FTSC with copper(II) in an aqueous solution and in a 30% (w/w) dimethyl sulfoxide/water mixture has been studied via pH potentiometry, UV-vis spectrophotometry, electron paramagnetic resonance, (1)H NMR spectroscopy, and spectrofluorimetry. By the reaction of copper(II) acetate with (S)-H2L and (R)-H2L in water, the complexes [Cu(S,R)-L] and [Cu(R,S)-L] have been synthesized and comprehensively characterized. An X-ray diffraction study of [Cu(S,R)-L] showed the formation of a square-pyramidal complex, with the bioconjugate acting as a pentadentate ligand. Both copper(II) complexes displayed antiproliferative activity in CH1 ovarian carcinoma cells and inhibited Topoisomerase IIα activity in a DNA plasmid relaxation assay.
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Affiliation(s)
- Felix Bacher
- Institute of Inorganic Chemistry, University of Vienna, Währinger Strasse 42, A-1090 Vienna, Austria
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Liu Y, Villamena FA, Rockenbauer A, Song Y, Zweier JL. Structural factors controlling the spin-spin exchange coupling: EPR spectroscopic studies of highly asymmetric trityl-nitroxide biradicals. J Am Chem Soc 2013; 135:2350-6. [PMID: 23320522 DOI: 10.1021/ja311571v] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Highly asymmetric exchange-coupled biradicals, e.g., the trityl-nitroxides (TNs), possess particular magnetic properties that have opened new possibilities for their application in biophysical, physicochemical, and biological studies. In the present work, we investigated the effect of the linker length on the spin-spin coupling interaction (J) in TN biradicals using the newly synthesized biradicals CT02-GT, CT02-AT, CT02-VT, and CT02-PPT as well as the previously reported biradicals TNN14 and TN1. The results show that the magnitude of J can be easily tuned from ~4 G (conformer 1 in CT02-PPT) to >1200 G (in TNN14) by varying the linker separating the two radical moieties and changing the temperature. Computer simulations of EPR spectra were carried out to estimate J values of the TN biradicals directly. In addition to the spin-spin coupling interaction of TN biradicals, their g, hyperfine-splitting, and zero-field-splitting interactions were explored at low temperature (220 K). Our present study clearly shows that varying the spin-spin interaction as a function of linker distance and temperature provides an effective strategy for the development of new TN biradicals that can find wide applications in relevant fields.
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Affiliation(s)
- Yangping Liu
- Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, Ohio 43210, USA
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Pingret D, Durand G, Fabiano-Tixier AS, Rockenbauer A, Ginies C, Chemat F. Degradation of edible oil during food processing by ultrasound: electron paramagnetic resonance, physicochemical, and sensory appreciation. J Agric Food Chem 2012; 60:7761-8. [PMID: 22804736 DOI: 10.1021/jf301286f] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
During ultrasound processing of lipid-containing food, some off-flavors can be detected, which can incite depreciation by consumers. The impacts of ultrasound treatment on sunflower oil using two different ultrasound horns (titanium and pyrex) were evaluated. An electron paramagnetic resonance study was performed to identify and quantify the formed radicals, along with the assessment of classical physicochemical parameters such as peroxide value, acid value, anisidine value, conjugated dienes, polar compounds, water content, polymer quantification, fatty acid composition, and volatiles profile. The study shows an increase of formed radicals in sonicated oils, as well as the modification of physicochemical parameters evidencing an oxidation of treated oils.
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Affiliation(s)
- Daniella Pingret
- Sécurité et Qualité des Produits d'Origine Végétale, Université d'Avignon et des Pays de Vaucluse, INRA, UMR408, F-84000 Avignon, France
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Nash KM, Rockenbauer A, Villamena FA. Reactive nitrogen species reactivities with nitrones: theoretical and experimental studies. Chem Res Toxicol 2012; 25:1581-97. [PMID: 22775566 DOI: 10.1021/tx200526y] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Reactive nitrogen species (RNS) such as nitrogen dioxide ((•)NO(2)), peroxynitrite (ONOO(-)), and nitrosoperoxycarbonate (ONOOCO(2)(-)) are among the most damaging species present in biological systems due to their ability to cause modification of key biomolecular systems through oxidation, nitrosylation, and nitration. Nitrone spin traps are known to react with free radicals and nonradicals via electrophilic and nucleophilic addition reactions and have been employed as reagents to detect radicals using electron paramagnetic resonance (EPR) spectroscopy and as pharmacological agents against oxidative stress-mediated injury. This study examines the reactivity of cyclic nitrones such as 5,5-dimethylpyrroline N-oxide (DMPO) with (•)NO(2), ONOO(-), ONOOCO(2)(-), SNAP, and SIN-1 using EPR. The thermochemistries of nitrone reactivity with RNS and isotropic hfsc's of the addition products were also calculated at the PCM(water)/B3LYP/6-31+G**//B3LYP/6-31G* level of theory with and without explicit water molecules to rationalize the nature of the observed EPR spectra. Spin trapping of other RNS such as azide ((•)N(3)), nitrogen trioxide ((•)NO(3)), amino ((•)NH(2)) radicals and nitroxyl (HNO) were also theoretically and experimentally investigated by EPR spin trapping and mass spectrometry. This study also shows that other spin traps such as 5-carbamoyl-5-methyl-pyrroline N-oxide, 5-ethoxycarbonyl-5-methyl-pyrroline N-oxide, and 5-(diethoxyphosphoryl)-5-methyl-1-pyrroline N-oxide can react with radical and nonradical RNS, thus making spin traps suitable probes as well as antioxidants against RNS-mediated oxidative damage.
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Affiliation(s)
- Kevin M Nash
- Department of Pharmacology, College of Medicine, The Ohio State University, Columbus, OH 43210, USA
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St. Thomas C, Maldonado‐Textle H, Rockenbauer A, Korecz L, Nagy N, Guerrero‐Santos R. Synthesis of NMP/RAFT inifers and preparation of block copolymers. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.26081] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Claude St. Thomas
- Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, 25100, Saltillo, Mexico
| | | | - Antal Rockenbauer
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Pusztaszeriút 59‐67, H‐1025 Budapest, Hungary
| | - Laszlo Korecz
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Pusztaszeriút 59‐67, H‐1025 Budapest, Hungary
| | - Nora Nagy
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Pusztaszeriút 59‐67, H‐1025 Budapest, Hungary
| | - Ramiro Guerrero‐Santos
- Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, 25100, Saltillo, Mexico
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Correia I, Jakusch T, Cobbinna E, Mehtab S, Tomaz I, Nagy NV, Rockenbauer A, Pessoa JC, Kiss T. Evaluation of the binding of oxovanadium(IV) to human serum albumin. Dalton Trans 2012; 41:6477-87. [PMID: 22476413 DOI: 10.1039/c2dt12193j] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The understanding of the biotransformations of insulin mimetic vanadium complexes in human blood and its transport to target cells is an essential issue in the development of more effective drugs. We present the study of the interaction of oxovanadium(iv) with human serum albumin (HSA) by electron paramagnetic resonance (EPR), circular dichroism (CD) and visible absorption spectroscopy. Metal competition studies were done using Cu(II) and Zn(II) as metal probes. The results show that V(IV)O occupies two types of binding sites in albumin, which compete not only with each other, but also with hydrolysis of the metal ion. In one of the sites the resulting V(IV)O-HSA complex has a weak visible CD signal and its X-band EPR spectrum may be easily measured. This was assigned to amino acid side chains of the ATCUN site. The other binding site shows stronger signals in the CD in the visible range, but has a hardly measurable EPR signal; it is assigned to the multi metal binding site (MBS) of HSA. Studies with fatted and defatted albumin show the complexity of the system since conformational changes, induced by the binding of fatty acids, decrease the ability of V(IV)O to bind albumin. The possibility and importance of ternary complex formation between V(IV)O, HSA and several drug candidates - maltol (mal), picolinic acid (pic), 2-hydroxypyridine-N-oxide (hpno) and 1,2-dimethyl-3-hydroxy-4(1H)-pyridinone (dhp) was also evaluated. In the presence of maltol the CD and EPR spectra significantly change, indicating the formation of ternary VO-HSA-maltol complexes. Modeling studies with amino acids and peptides were used to propose binding modes. Based on quantitative RT EPR measurements and CD data, it was concluded that in the systems with mal, pic, hpno, and dhp (V(IV)OL(2))(n)(HSA) species form, where the maximum value for n is at least 6 (mal, pic). The degree of formation of the ternary species, corresponding to the reaction V(IV)OL(2) + HSA -->/<-- V(IV)OL(2)(HSA) is hpno > pic ≥ mal > dhp. (V(IV)OL)(n)(HSA) type complexes are detected exclusively with pic. Based on the spectroscopic studies we propose that in the (V(IV)OL(2))(n)(HSA) species the protein bounds to vanadium through the histidine side chains.
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Affiliation(s)
- Isabel Correia
- Centro de Química Estrutural, Instituto Superior Técnico, Lisbon, Portugal
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Nagy NV, Doorslaer SV, Szabó-Plánka T, Rompaey SV, Hamza A, Fülöp F, Tóth GK, Rockenbauer A. Copper(II)-Binding Ability of Stereoisomeric cis- and trans-2-Aminocyclohexanecarboxylic Acid–l-Phenylalanine Dipeptides. A Combined CW/Pulsed EPR and DFT Study. Inorg Chem 2012; 51:1386-99. [DOI: 10.1021/ic2016116] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nóra V. Nagy
- Institute of Structural Chemistry, Chemical Research Center of the Hungarian Academy of Sciences, Pusztaszeri út 59-67, H-1025 Budapest, Hungary
| | | | - Terézia Szabó-Plánka
- Department of Physical Chemistry
and Materials Sciences, University of Szeged, Aradi vértanúk tere 1, H-6720 Szeged, Hungary
| | - Senne Van Rompaey
- Department of Physics, University of Antwerp, B-2610 Wilrijk-Antwerp, Belgium
| | - Andrea Hamza
- Institute of Structural Chemistry, Chemical Research Center of the Hungarian Academy of Sciences, Pusztaszeri út 59-67, H-1025 Budapest, Hungary
| | - Ferenc Fülöp
- Institute of Pharmaceutical
Chemistry, University of Szeged, Eötvös
u. 6, H-6720 Szeged, Hungary
| | - Gábor K. Tóth
- Faculty of Medicine, University of Szeged, Dóm tér 8, H-6720
Szeged, Hungary
| | - Antal Rockenbauer
- Institute of Structural Chemistry, Chemical Research Center of the Hungarian Academy of Sciences, Pusztaszeri út 59-67, H-1025 Budapest, Hungary
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Bailey DM, Evans KA, McEneny J, Young IS, Hullin DA, James PE, Ogoh S, Ainslie PN, Lucchesi C, Rockenbauer A, Culcasi M, Pietri S. Exercise-induced oxidative-nitrosative stress is associated with impaired dynamic cerebral autoregulation and blood-brain barrier leakage. Exp Physiol 2011; 96:1196-207. [DOI: 10.1113/expphysiol.2011.060178] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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48
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Szabó-Plánka T, Moncol J, Tóth E, Gyurcsik B, Nagy NV, Vasková Z, Rockenbauer A, Valigura D. ESR and pH-potentiometric study of the mixed–ligand complex formation in the copper(II)–4-fluorosalicylic acid–N,N-diethylnicotinamide system: Structure and spectral properties of [Cu(4-fluorosalicylate)2(N,N-diethylnicotinamide)2(H2O)2] complex. Polyhedron 2011. [DOI: 10.1016/j.poly.2011.06.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Liu Y, Song Y, Rockenbauer A, Sun J, Hemann C, Villamena FA, Zweier JL. Synthesis of trityl radical-conjugated disulfide biradicals for measurement of thiol concentration. J Org Chem 2011; 76:3853-60. [PMID: 21488696 DOI: 10.1021/jo200265u] [Citation(s) in RCA: 33] [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] [Indexed: 02/05/2023]
Abstract
Measurement of thiol concentrations is of great importance for characterizing their critical role in normal metabolism and disease. Low-frequency electron paramagnetic resonance (EPR) spectroscopy and imaging, coupled with the use of exogenous paramagnetic probes, have been indispensable techniques for the in vivo measurement of various physiological parameters owing to the specificity, noninvasiveness and good depth of magnetic field penetration in animal tissues. However, in vivo detection of thiol levels by EPR spectroscopy and imaging is limited due to the need for improved probes. We report the first synthesis of trityl radical-conjugated disulfide biradicals (TSSN and TSST) as paramagnetic thiol probes. The use of trityl radicals in the construction of these biradicals greatly facilitates thiol measurement by EPR spectroscopy since trityls have extraordinary stability in living tissues with a single narrow EPR line that enables high sensitivity and resolution for in vivo EPR spectroscopy and imaging. Both biradicals exhibit broad characteristic EPR spectra at room temperature because of their intramolecular spin-spin interaction. Reaction of these biradicals with thiol compounds such as glutathione (GSH) and cysteine results in the formation of trityl monoradicals which exhibit high spectral sensitivity to oxygen. The moderately slow reaction between the biradicals and GSH (k(2) ∼ 0.3 M(-1) s(-1) for TSSN and 0.2 M(-1) s(-1) for TSST) allows for in vivo measurement of GSH concentration without altering the redox environment in biological systems. The GSH concentration in rat liver was determined to be 3.49 ± 0.14 mM by TSSN and 3.67 ± 0.24 mM by TSST, consistent with the value (3.71 ± 0.09 mM) determined by the Ellman's reagent. Thus, these trityl-based thiol probes exhibit unique properties enabling measurement of thiols in biological systems and should be of great value for monitoring redox metabolism.
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Affiliation(s)
- Yangping Liu
- Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, the Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, Ohio 43210, United States
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Gosset G, Clément JL, Culcasi M, Rockenbauer A, Pietri S. CyDEPMPOs: A class of stable cyclic DEPMPO derivatives with improved properties as mechanistic markers of stereoselective hydroxyl radical adduct formation in biological systems. Bioorg Med Chem 2011; 19:2218-30. [DOI: 10.1016/j.bmc.2011.02.040] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2010] [Revised: 02/14/2011] [Accepted: 02/18/2011] [Indexed: 11/28/2022]
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