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Deletraz A, Zéamari K, Di Meo F, Fabre PL, Reybier K, Trouillas P, Tuccio B, Durand G. Reactivities of MeO-substituted PBN-type nitrones. NEW J CHEM 2019. [DOI: 10.1039/c9nj03805a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
MeO-derivatives of phenyl nitrones were synthesized and their electrochemical and spin-trapping properties were studied.
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Affiliation(s)
- Anaïs Deletraz
- Institut des Biomolécules Max Mousseron
- UMR 5247 CNRS-Université Montpellier-ENSCM & Avignon Université
- Equipe Chimie Bioorganique et Systèmes Amphiphiles
- Avignon 84916 Cedex 9
- France
| | - Kamal Zéamari
- Institut des Biomolécules Max Mousseron
- UMR 5247 CNRS-Université Montpellier-ENSCM & Avignon Université
- Equipe Chimie Bioorganique et Systèmes Amphiphiles
- Avignon 84916 Cedex 9
- France
| | - Florent Di Meo
- INSERM U1248 IPPRITT
- Université de Limoges
- Faculté de Médecine et Pharmacie
- France
| | | | | | - Patrick Trouillas
- INSERM U1248 IPPRITT
- Université de Limoges
- Faculté de Médecine et Pharmacie
- France
- Regional Centre of Advanced Technologies and Materials
| | - Béatrice Tuccio
- Aix-Marseille Université
- CNRS
- ICR UMR 7273
- 13397 Marseille Cedex 20
- France
| | - Grégory Durand
- Institut des Biomolécules Max Mousseron
- UMR 5247 CNRS-Université Montpellier-ENSCM & Avignon Université
- Equipe Chimie Bioorganique et Systèmes Amphiphiles
- Avignon 84916 Cedex 9
- France
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2
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Durand G, Rosselin M, Klein PA, Zéamari K, Choteau F, Tuccio B. α-Phenyl-N-cyclohexyl Nitrones: Preparation and Use as Spin-Traps. J Org Chem 2016; 82:135-142. [DOI: 10.1021/acs.joc.6b02262] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Grégory Durand
- Institut des Biomolécules Max Mousseron UMR 5247 CNRS-Université Montpellier-ENSCM & Avignon Université, Equipe Chimie Bioorganique et Systèmes Amphiphiles, 301 rue Baruch de Spinoza BP 21239, Avignon 84916 Cedex 9, France
| | - Marie Rosselin
- Institut des Biomolécules Max Mousseron UMR 5247 CNRS-Université Montpellier-ENSCM & Avignon Université, Equipe Chimie Bioorganique et Systèmes Amphiphiles, 301 rue Baruch de Spinoza BP 21239, Avignon 84916 Cedex 9, France
| | | | - Kamal Zéamari
- Institut des Biomolécules Max Mousseron UMR 5247 CNRS-Université Montpellier-ENSCM & Avignon Université, Equipe Chimie Bioorganique et Systèmes Amphiphiles, 301 rue Baruch de Spinoza BP 21239, Avignon 84916 Cedex 9, France
| | - Fanny Choteau
- Institut des Biomolécules Max Mousseron UMR 5247 CNRS-Université Montpellier-ENSCM & Avignon Université, Equipe Chimie Bioorganique et Systèmes Amphiphiles, 301 rue Baruch de Spinoza BP 21239, Avignon 84916 Cedex 9, France
| | - Béatrice Tuccio
- Aix-Marseille Université, CNRS, ICR (UMR 7273), Marseille 13397, France
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3
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Scott MJ, Billiar TR, Stoyanovsky DA. N-tert-butylmethanimine N-oxide is an efficient spin-trapping probe for EPR analysis of glutathione thiyl radical. Sci Rep 2016; 6:38773. [PMID: 27941944 PMCID: PMC5150238 DOI: 10.1038/srep38773] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Accepted: 11/10/2016] [Indexed: 12/29/2022] Open
Abstract
The electron spin resonance (EPR) spin-trapping technique allows detection of radical species with nanosecond half-lives. This technique is based on the high rates of addition of radicals to nitrones or nitroso compounds (spin traps; STs). The paramagnetic nitroxides (spin-adducts) formed as a result of reactions between STs and radical species are relatively stable compounds whose EPR spectra represent “structural fingerprints” of the parent radical species. Herein we report a novel protocol for the synthesis of N-tert-butylmethanimine N-oxide (EBN), which is the simplest nitrone containing an α-H and a tertiary α′-C atom. We present EPR spin-trapping proof that: (i) EBN is an efficient probe for the analysis of glutathione thiyl radical (GS•); (ii) β-cyclodextrins increase the kinetic stability of the spin-adduct EBN/•SG; and (iii) in aqueous solutions, EBN does not react with superoxide anion radical (O2−•) to form EBN/•OOH to any significant extent. The data presented complement previous studies within the context of synthetic accessibility to EBN and efficient spin-trapping analysis of GS•.
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Affiliation(s)
- Melanie J Scott
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Timothy R Billiar
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Detcho A Stoyanovsky
- Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
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4
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Gruber N, Piehl LL, Rubin de Celis E, Díaz JE, García MB, Stipa P, Orelli LR. Amidinoquinoxaline N-oxides as novel spin traps. RSC Adv 2015. [DOI: 10.1039/c4ra14335c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
A series of nitrones were synthesized and tested as novel spin traps. The adducts generated by CH3 addition showed remarkably persistent signals. Their EPR features and kinetics were rationalised by DFT and MP2 calculations.
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Affiliation(s)
- Nadia Gruber
- Departamento de Química Orgánica
- Facultad de Farmacia y Bioquímica
- Universidad de Buenos Aires
- CONICET
- Buenos Aires
| | - Lidia L. Piehl
- Cátedra de Física
- Departamento de Fisicomatemática
- Facultad de Farmacia y Bioquímica
- Universidad de Buenos Aires
- Buenos Aires
| | - Emilio Rubin de Celis
- Cátedra de Física
- Departamento de Fisicomatemática
- Facultad de Farmacia y Bioquímica
- Universidad de Buenos Aires
- Buenos Aires
| | - Jimena E. Díaz
- Departamento de Química Orgánica
- Facultad de Farmacia y Bioquímica
- Universidad de Buenos Aires
- CONICET
- Buenos Aires
| | - María B. García
- Departamento de Química Orgánica
- Facultad de Farmacia y Bioquímica
- Universidad de Buenos Aires
- CONICET
- Buenos Aires
| | - Pierluigi Stipa
- S.I.M.A.U. Department Chemistry Division
- Università Politecnica delle Marche
- I-60131 Ancona
- Italy
| | - Liliana R. Orelli
- Departamento de Química Orgánica
- Facultad de Farmacia y Bioquímica
- Universidad de Buenos Aires
- CONICET
- Buenos Aires
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5
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Mitsuta K. Reconsideration of the Optically Investigated Competitive Reaction between CytochromecReduction due to Superoxide and Superoxide Dismutation in the Presence of Xanthine Oxidase. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2013. [DOI: 10.1246/bcsj.20120196] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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6
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Potential implication of the chemical properties and bioactivity of nitrone spin traps for therapeutics. Future Med Chem 2012; 4:1171-207. [PMID: 22709256 DOI: 10.4155/fmc.12.74] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Nitrone therapeutics has been employed in the treatment of oxidative stress-related diseases such as neurodegeneration, cardiovascular disease and cancer. The nitrone-based compound NXY-059, which is the first drug to reach clinical trials for the treatment of acute ischemic stroke, has provided promise for the development of more robust pharmacological agents. However, the specific mechanism of nitrone bioactivity remains unclear. In this review, we present a variety of nitrone chemistry and biological activity that could be implicated for the nitrone's pharmacological activity. The chemistries of spin trapping and spin adduct reveal insights on the possible roles of nitrones for altering cellular redox status through radical scavenging or nitric oxide donation, and their biological effects are presented. An interdisciplinary approach towards the development of novel synthetic antioxidants with improved pharmacological properties encompassing theoretical, synthetic, biochemical and in vitro/in vivo studies is covered.
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Mitsuta K. Reevaluation of the Reactivity of Superoxide Radicals by Consideration of Both the Alkalinity of KO2 and the Superoxide-Scavenging Activity of Xanthine Oxidase. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2012. [DOI: 10.1246/bcsj.20110363] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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8
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Molybdenum oxide/bipyridine hybrid material {[MoO3(bipy)][MoO3(H2O)]}n as catalyst for the oxidation of secondary amines to nitrones. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.10.079] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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9
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Allouch A, Lauricella R, Tuccio B. Effect of pH on superoxide/hydroperoxyl radical trapping by nitrones: an EPR/kinetic study. Mol Phys 2010. [DOI: 10.1080/00268970701494024] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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10
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Mitsuta K. The Evaluation Theory of Free Radical Scavenging and the Application to Xanthine Oxidase. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2010. [DOI: 10.1246/bcsj.20090311] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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11
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Barriga G, Olea-Azar C, Norambuena E, Castro A, Porcal W, Gerpe A, González M, Cerecetto H. New heteroaryl nitrones with spin trap properties: Identification of a 4-furoxanyl derivative with excellent properties to be used in biological systems. Bioorg Med Chem 2009; 18:795-802. [PMID: 20031416 DOI: 10.1016/j.bmc.2009.11.053] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2009] [Revised: 11/18/2009] [Accepted: 11/21/2009] [Indexed: 11/29/2022]
Abstract
A new series of heteroaryl nitrones, 1-7, bearing furoxanyl and thiadiazolyl moieties, were evaluated for their free radical-trapping properties. The physicochemical characterization by electron paramagnetic resonance (EPR) demonstrated its capability to trap and stabilize oxygen-, carbon-, sulfur-, and nitrogen-centered free radicals. The 4-furoxanyl nitrone 3 (FxBN), alpha(Z)-(3-methylfuroxan-4-yl)-N-tert-butylnitrone, showed appropriate solubility in aqueous solution and taking into account that this physicochemical property is very important for biological applications, we studied it deeply in terms of its trapping and kinetic behaviors. For this, kinetic studies of the hydroxyl adduct decay gave rate constants k(ST) of 1.22x10(10)dm(3)mol(-1)s(-1) and half-live up to 7200s at physiological pH, without any artifactual signals. The ability of FxBN to directly traps and stabilizes superoxide free radical, with a half-life of 1620s at physiological pH, was also demonstrated. Besides, FxBN-hydroxyl and -superoxide adducts exhibited distinct and characteristic EPR spectral patterns. Finally, we confirmed the ability of FxBN to act as spin trap in a specific biological system, that is, in the free radical production of experimental anti-trypanosomatid drugs using Trypanosoma cruzi microsomes as biological system. Moreover, previous observations of low FxBN toxicity transform it in a good candidate for in vivo spin trapping.
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Affiliation(s)
- Germán Barriga
- Departamento de Química Inorgánica y Analítica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
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12
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Durand G, Choteau F, Pucci B, Villamena FA. Reactivity of superoxide radical anion and hydroperoxyl radical with alpha-phenyl-N-tert-butylnitrone (PBN) derivatives. J Phys Chem A 2009; 112:12498-509. [PMID: 18998656 DOI: 10.1021/jp804929d] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Nitrones have exhibited pharmacological activity against radical-mediated pathophysiological conditions and as analytical reagents for the identification of transient radical species by electron paramagnetic resonance (EPR) spectroscopy. In this work, competitive spin trapping, stopped-flow kinetics, and density functional theory (DFT) were employed to assess and predict the reactivity of O(2)(*-) and HO(2)(*) with various para-substituted alpha-phenyl-N-tert-butylnitrone (PBN) spin traps. Rate constants of O(2)(*-) trapping by nitrones were determined using competitive UV-vis stopped-flow method with phenol red (PR) as probe, while HO(2)(*) trapping rate constants were calculated using competition kinetics with 5,5-dimethylpyrroline N-oxide (DMPO) by employing EPR spectroscopy. The effects of the para substitution on the charge density of the nitronyl-carbon and on the free energies of nitrone reactivity with O(2)(*-) and HO(2)(*) were computationally rationalized at the PCM/B3LYP/6-31+G(d,p)//B3LYP/6-31G(d) level of theory. Theoretical and experimental data show that the rate of O(2)(*-) addition to PBN derivatives is not affected by the polar effect of the substituents. However, the reactivity of HO(2)(*) follows the Hammett equation and is increased as the substituent becomes more electron withdrawing. This supports the conclusion that the nature of HO(2)(*) addition to PBN derivatives is electrophilic, while the addition of O(2)(*-) to PBN-type compounds is only weakly electrophilic.
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Affiliation(s)
- Grégory Durand
- Laboratoire de Chimie Bioorganique et des Systèmes Moléculaires Vectoriels, Université d'Avignon et des Pays de Vaucluse, Faculté des Sciences, 33 rue Louis Pasteur, 84000 Avignon, France.
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13
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Han Y, Tuccio B, Lauricella R, Villamena FA. Improved spin trapping properties by beta-cyclodextrin-cyclic nitrone conjugate. J Org Chem 2008; 73:7108-17. [PMID: 18707169 DOI: 10.1021/jo8007176] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Spin trapping using a nitrone and electron paramagnetic resonance (EPR) spectroscopy is commonly employed in the identification of transient radicals in chemical and biological systems. There has also been a growing interest in the pharmacological activity of nitrones, and there is, therefore, a pressing need to develop nitrones with improved spin trapping properties and controlled delivery in cellular systems. The beta-cyclodextrin (beta-CD)-cyclic nitrone conjugate, 5-N-beta-cyclodextrin-carboxamide-5-methyl-1-pyrroline N-oxide (CDNMPO) was synthesized and characterized. 1-D and 2-D NMR show two stereoisomeric forms (i.e., 5S- and 5R-) for CDNMPO. Spin trapping using CDNMPO shows distinctive EPR spectra for superoxide radical anion (O2(*-)) compared to other biologically relevant free radicals. Kinetic analysis of O2(*-) adduct formation and decay using singular value decomposition and pseudoinverse deconvolution methods gave an average bimolecular rate constant of k = 58 +/- 1 M(-1) s(-1) and a maximum half-life of t(1/2) = 27.5 min at pH 7.0. Molecular modeling was used to rationalize the long-range coupling between the nitrone and the beta-CD, as well as the stability of the O2(*-) adducts. This study demonstrates how a computational approach can aid in the design of spin traps with a relatively high rate of reactivity to O2(*-), and how beta-CD can improve adduct stability via intramolecular interaction with the O2(*-) adduct.
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Affiliation(s)
- Yongbin Han
- Department of Pharmacology, The Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, Ohio 43210, USA
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14
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Han Y, Tuccio B, Lauricella R, Rockenbauer A, Zweier JL, Villamena FA. Synthesis and Spin-Trapping Properties of a New Spirolactonyl Nitrone. J Org Chem 2008; 73:2533-41. [DOI: 10.1021/jo702434u] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yongbin Han
- Department of Pharmacology and Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, and the Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, Ohio 43210, Laboratory Chimie Provence-UMR 6264, University of Provence-CNRS, Faculty of Sciences, Saint Jerome 13397 Marseille Cedex 20, France, and Chemical Research Center, Institute of Structural Chemistry, H-1025 Budapest, Pusztaszeri 59,
| | - Beatrice Tuccio
- Department of Pharmacology and Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, and the Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, Ohio 43210, Laboratory Chimie Provence-UMR 6264, University of Provence-CNRS, Faculty of Sciences, Saint Jerome 13397 Marseille Cedex 20, France, and Chemical Research Center, Institute of Structural Chemistry, H-1025 Budapest, Pusztaszeri 59,
| | - Robert Lauricella
- Department of Pharmacology and Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, and the Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, Ohio 43210, Laboratory Chimie Provence-UMR 6264, University of Provence-CNRS, Faculty of Sciences, Saint Jerome 13397 Marseille Cedex 20, France, and Chemical Research Center, Institute of Structural Chemistry, H-1025 Budapest, Pusztaszeri 59,
| | - Antal Rockenbauer
- Department of Pharmacology and Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, and the Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, Ohio 43210, Laboratory Chimie Provence-UMR 6264, University of Provence-CNRS, Faculty of Sciences, Saint Jerome 13397 Marseille Cedex 20, France, and Chemical Research Center, Institute of Structural Chemistry, H-1025 Budapest, Pusztaszeri 59,
| | - Jay L. Zweier
- Department of Pharmacology and Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, and the Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, Ohio 43210, Laboratory Chimie Provence-UMR 6264, University of Provence-CNRS, Faculty of Sciences, Saint Jerome 13397 Marseille Cedex 20, France, and Chemical Research Center, Institute of Structural Chemistry, H-1025 Budapest, Pusztaszeri 59,
| | - Frederick A. Villamena
- Department of Pharmacology and Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, and the Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, Ohio 43210, Laboratory Chimie Provence-UMR 6264, University of Provence-CNRS, Faculty of Sciences, Saint Jerome 13397 Marseille Cedex 20, France, and Chemical Research Center, Institute of Structural Chemistry, H-1025 Budapest, Pusztaszeri 59,
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15
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Astolfi P, Marini M, Stipa P. Radical Trapping Properties of 3-Aryl-2H-benzo[1,4]oxazin-4-oxides. J Org Chem 2007; 72:8677-82. [PMID: 17944517 DOI: 10.1021/jo071212i] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Paola Astolfi
- Dipartimento di Scienze e Tecnologie Chimiche, Università Politecnica delle Marche, via Brecce Bianche, I-60131 Ancona, Italy
| | - Milvia Marini
- Dipartimento di Scienze e Tecnologie Chimiche, Università Politecnica delle Marche, via Brecce Bianche, I-60131 Ancona, Italy
| | - Pierluigi Stipa
- Dipartimento di Scienze e Tecnologie Chimiche, Università Politecnica delle Marche, via Brecce Bianche, I-60131 Ancona, Italy
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16
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Swartz HM, Khan N, Khramtsov VV. Use of electron paramagnetic resonance spectroscopy to evaluate the redox state in vivo. Antioxid Redox Signal 2007; 9:1757-71. [PMID: 17678441 PMCID: PMC2702846 DOI: 10.1089/ars.2007.1718] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The aim of this article is to provide an overview of how electron paramagnetic resonance (EPR) can be used to measure redox-related parameters in vivo. The values of this approach include that the measurements are made under fully physiological conditions, and some of the measurements cannot be made by other means. Three complementary approaches are used with in vivo EPR: the rate of reduction or reactions of nitroxides, spin trapping of free radicals, and measurements of thiols. All three approaches already have produced unique and useful information. The measurement of the rate of decrease of nitroxides technically is the simplest, but difficult to interpret because the measured parameter, reduction in the intensity of the nitroxide signal, can occur by several different mechanisms. In vivo spin trapping can provide direct evidence for the occurrence of specific free radicals in vivo and reflect relative changes, but accurate absolute quantification remains challenging. The measurement of thiols in vivo also appears likely to be useful, but its development as an in vivo technique is at an early stage. It seems likely that the use of in vivo EPR to measure redox processes will become an increasingly utilized and valuable tool.
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Affiliation(s)
- Harold M Swartz
- Department of Radiology, Dartmouth Medical School, Hanover, New Hampshire 03755, USA.
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17
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Villamena FA, Xia S, Merle JK, Lauricella R, Tuccio B, Hadad CM, Zweier JL. Reactivity of superoxide radical anion with cyclic nitrones: role of intramolecular H-bond and electrostatic effects. J Am Chem Soc 2007; 129:8177-91. [PMID: 17564447 PMCID: PMC2527741 DOI: 10.1021/ja0702622] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Limitations exist among the commonly used cyclic nitrone spin traps for biological free radical detection using electron paramagnetic resonance (EPR) spectroscopy. The design of new spin traps for biological free radical detection and identification using EPR spectroscopy has been a major challenge due to the lack of systematic and rational approaches to their design. In this work, density functional theory (DFT) calculations and stopped-flow kinetics were employed to predict the reactivity of functionalized spin traps with superoxide radical anion (O2*-). Functional groups provide versatility and can potentially improve spin-trap reactivity, adduct stability, and target specificity. The effect of functional group substitution at the C-5 position of pyrroline N-oxides on spin-trap reactivity toward O2*- was computationally rationalized at the PCM/B3LYP/6-31+G(d,p)//B3LYP/6-31G(d) and PCM/mPW1K/6-31+G(d,p) levels of theory. Calculated free energies and rate constants for the reactivity of O2*- with model nitrones were found to correlate with the experimentally obtained rate constants using stopped-flow and EPR spectroscopic methods. New insights into the nucleophilic nature of O2*- addition to nitrones as well as the role of intramolecular hydrogen bonding of O2*- in facilitating this reaction are discussed. This study shows that using an N-monoalkylsubstituted amide or an ester as attached groups on the nitrone can be ideal in molecular tethering for improved spin-trapping properties and could pave the way for improved in vivo radical detection at the site of superoxide formation.
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Affiliation(s)
- Frederick A. Villamena
- Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, and the Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, Columbus, Ohio, USA 43210
| | - Shijing Xia
- Department of Chemistry, The Ohio State University, Columbus, Ohio, USA 43210
| | - John K. Merle
- Department of Chemistry, The Ohio State University, Columbus, Ohio, USA 43210
| | - Robert Lauricella
- Laboratory TRACES, JE 2421, Aix-Marseille Universite, Faculte St Jerome, 13397 Marseille cedex 20, France
| | - Beatrice Tuccio
- Laboratory TRACES, JE 2421, Aix-Marseille Universite, Faculte St Jerome, 13397 Marseille cedex 20, France
| | | | - Jay L. Zweier
- Center for Biomedical EPR Spectroscopy and Imaging, The Davis Heart and Lung Research Institute, and the Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, Columbus, Ohio, USA 43210
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18
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Shioji K, Takao M, Okuma K. Convenient Synthesis of Linear Spin Traps Containing Diphenylphosphoryl Groups. CHEM LETT 2006. [DOI: 10.1246/cl.2006.1332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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