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Antonijević M, Avdović E, Simijonović D, Milanović Ž, Žižić M, Marković Z. Investigation of novel radical scavenging mechanisms in the alkaline environment: Green, sustainable and environmentally friendly antioxidative agent(s). THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:169307. [PMID: 38128658 DOI: 10.1016/j.scitotenv.2023.169307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 11/20/2023] [Accepted: 12/10/2023] [Indexed: 12/23/2023]
Abstract
Pharmaceutical and industrial utilization of synthetic chemicals has an immerse impact on the environment. In that sense, novel chemicals with potential for industrial application should be investigated for their behaviour in reactions with hydroxyl radical, simulating AOPs (Advanced Oxidation Processes). AOPs are known for being highly effective in wastewater management and natural water remediation. In this paper, exhaustive research on the radical scavenging activity of a newly synthesized coumarin derivative (4HCBH), as a representative of the series of coumarin-benzohydrazides with high antioxidative potential was conducted. This study took into consideration the pH value range significant for practically all living organisms (pH = 7.0-8.5). According to the experimentally obtained results, the 4HCBH showed an increase in radical scavenging activity, following the slight increase in pH values, which suggested that the formation of anionic form of 4HCBH is responsible for its antiradical activity. Further investigations led to the postulation of a novel mechanistic approach called Sequential Proton Loss Electron Transfer - Radical-Radical Coupling (SPLET-RRC), in which, by a series of steps, a new, stable compound was formed. Furthermore, it was demonstrated that the product generated through SPLET-RRC showed lower toxicity than the parent molecule.
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Affiliation(s)
- Marko Antonijević
- University of Kragujevac, Faculty of Science, Department of Chemistry, Radoja Domanovića 12, 34000 Kragujevac, Serbia; University of Kragujevac, Institute for Information Technologies, Department of Science, Jovana Cvijića bb, 34000 Kragujevac, Serbia
| | - Edina Avdović
- University of Kragujevac, Institute for Information Technologies, Department of Science, Jovana Cvijića bb, 34000 Kragujevac, Serbia
| | - Dušica Simijonović
- University of Kragujevac, Institute for Information Technologies, Department of Science, Jovana Cvijića bb, 34000 Kragujevac, Serbia
| | - Žiko Milanović
- University of Kragujevac, Institute for Information Technologies, Department of Science, Jovana Cvijića bb, 34000 Kragujevac, Serbia
| | - Milan Žižić
- University of Belgrade, Institute for Multidisciplinary Research, Life Sciences Department, Kneza Višeslava 1, 11030 Belgrade, Serbia
| | - Zoran Marković
- University of Kragujevac, Institute for Information Technologies, Department of Science, Jovana Cvijića bb, 34000 Kragujevac, Serbia; State University of Novi Pazar, Department of Natural Sciences and Mathematics, 36300 Vuka Karadžića, Novi Pazar, Serbia; University of Applied Sciences, Department of Engineering and Natural Sciences, Eberhard-Leibnitz-Straße 2, DE-06217 Merseburg, Germany.
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Santacruz W, Fiori I, de Mello R, Motheo AJ. Detection of radicals produced during electro-oxidation of atrazine using commercial DSA®-Cl 2 in methanol media: Keys to understand the process. CHEMOSPHERE 2022; 307:136157. [PMID: 36029853 DOI: 10.1016/j.chemosphere.2022.136157] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 08/17/2022] [Accepted: 08/19/2022] [Indexed: 06/15/2023]
Abstract
This work reports the radicals detected and identified during the degradation of atrazine in methanol medium in the presence and absence of different proportions of water (0%, 5%, and 10%). The determination of these radicals is an important step to understand the electrolysis processes in methanol medium and contribute to clarify the degradation mechanism. Furthermore, the parameters for the successful removal of the contaminant were optimized and the results showed that the application of the technique led to the removal of nearly 99.8% of atrazine after 1 h of electrolysis. The oxidation kinetics was found to be very fast and most of the atrazine molecule in the medium was degraded in the first hour of electrolysis. The results obtained from a thorough analysis conducted with a view to evaluating the effects of different current densities and initial pH values on atrazine degradation showed that the application of higher current densities resulted in lower energy consumption, as this led to faster removal of atrazine. Additionally, the initial pH of the solution was found to favor the formation of different species of active chlorine. The radicals formed during the electro-oxidation process were detected by electron paramagnetic resonance spectroscopy and include hydroxyl, methoxy and hydroxymethyl. The use of methanol for the degradation of pollutants is a highly promising technique and this work shows that the identification of the different radicals formed in the process can be the key to understanding the degradation mechanism.
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Affiliation(s)
- William Santacruz
- São Carlos Institute of Chemistry, University of São Paulo, P.O. Box 780, CEP 13560-970. São Carlos, SP, Brazil
| | - Isabela Fiori
- São Carlos Institute of Chemistry, University of São Paulo, P.O. Box 780, CEP 13560-970. São Carlos, SP, Brazil
| | - Rodrigo de Mello
- São Carlos Institute of Chemistry, University of São Paulo, P.O. Box 780, CEP 13560-970. São Carlos, SP, Brazil
| | - Artur J Motheo
- São Carlos Institute of Chemistry, University of São Paulo, P.O. Box 780, CEP 13560-970. São Carlos, SP, Brazil.
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3
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Brezová V, Barbieriková Z, Zalibera M, Lušpai K, Tholtová A, Dvoranová D. Titania-mediated photoinduced fluorination of nitrone spin traps in acetonitrile (an EPR study). J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.114111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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4
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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] [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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Cassien M, Mercier A, Thétiot-Laurent S, Culcasi M, Ricquebourg E, Asteian A, Herbette G, Bianchini JP, Raharivelomanana P, Pietri S. Improving the Antioxidant Properties of Calophyllum inophyllum Seed Oil from French Polynesia: Development and Biological Applications of Resinous Ethanol-Soluble Extracts. Antioxidants (Basel) 2021; 10:antiox10020199. [PMID: 33573143 PMCID: PMC7910904 DOI: 10.3390/antiox10020199] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 01/19/2021] [Accepted: 01/23/2021] [Indexed: 01/07/2023] Open
Abstract
Tamanu oil from Calophyllum inophyllum L. has long been used in traditional medicine. Ethanol extraction was found the best strategy for recovering bioactive compounds from the resin part of Tamanu oil, yielding two neutral and acidic resins fractions with high phenolics, flavonoids and pyranocoumarins concentrations. A further cascade of LPLC/HPLC separations of neutral and acidic resin fractions allowed identifying fifteen metabolites, and among them, calanolide D and 12-oxocalanolide A (both in neutral fraction) were first identified from a natural source. All these extracts, subfractions and isolated metabolites demonstrated increased free radical scavenging, antioxidant, anti-inflammatory, antimicrobial and antimycobacterial activity compared to Tamanu oil and its de-resinated lipid phase. Overall, these results could promote resinous ethanol-soluble Tamanu oil extracts as a useful multifaceted and renewable medicinal resource.
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Affiliation(s)
- Mathieu Cassien
- Aix Marseille Univ, CNRS, ICR , UMR 7273, SMBSO, 13397 Marseille , France; (M.C.); (A.M.); (S.T.-L.); (M.C.); (E.R.); (A.A.)
- Univ Polynésie Française, IFREMER, ILM, IRD, EIO UMR 241, 98702 Faa’a Tahiti, French Polynesia; (J.-P.B.); (P.R.)
- Yelen Analytics, 13820 Ensuès–la-Redonne, France
| | - Anne Mercier
- Aix Marseille Univ, CNRS, ICR , UMR 7273, SMBSO, 13397 Marseille , France; (M.C.); (A.M.); (S.T.-L.); (M.C.); (E.R.); (A.A.)
| | - Sophie Thétiot-Laurent
- Aix Marseille Univ, CNRS, ICR , UMR 7273, SMBSO, 13397 Marseille , France; (M.C.); (A.M.); (S.T.-L.); (M.C.); (E.R.); (A.A.)
| | - Marcel Culcasi
- Aix Marseille Univ, CNRS, ICR , UMR 7273, SMBSO, 13397 Marseille , France; (M.C.); (A.M.); (S.T.-L.); (M.C.); (E.R.); (A.A.)
| | - Emilie Ricquebourg
- Aix Marseille Univ, CNRS, ICR , UMR 7273, SMBSO, 13397 Marseille , France; (M.C.); (A.M.); (S.T.-L.); (M.C.); (E.R.); (A.A.)
| | - Alice Asteian
- Aix Marseille Univ, CNRS, ICR , UMR 7273, SMBSO, 13397 Marseille , France; (M.C.); (A.M.); (S.T.-L.); (M.C.); (E.R.); (A.A.)
| | - Gaëtan Herbette
- Aix Marseille Univ, CNRS, Spectropole, FSCM, 13397 Marseille, France;
| | - Jean-Pierre Bianchini
- Univ Polynésie Française, IFREMER, ILM, IRD, EIO UMR 241, 98702 Faa’a Tahiti, French Polynesia; (J.-P.B.); (P.R.)
| | - Phila Raharivelomanana
- Univ Polynésie Française, IFREMER, ILM, IRD, EIO UMR 241, 98702 Faa’a Tahiti, French Polynesia; (J.-P.B.); (P.R.)
| | - Sylvia Pietri
- Aix Marseille Univ, CNRS, ICR , UMR 7273, SMBSO, 13397 Marseille , France; (M.C.); (A.M.); (S.T.-L.); (M.C.); (E.R.); (A.A.)
- Correspondence: ; Tel.: +33-(0)4-91-28-85-79; Fax: +33-(0)4-91-28-87-58
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6
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Detection of Superoxide Radical in Adherent Living Cells by Electron Paramagnetic Resonance (EPR) Spectroscopy Using Cyclic Nitrones. Methods Mol Biol 2020. [PMID: 32857354 DOI: 10.1007/978-1-0716-0896-8_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/13/2023]
Abstract
Spin trapping with cyclic nitrones coupled to electron paramagnetic resonance (EPR) enables the detection and characterization of oxygen-derived free radicals, such as superoxide and hydroxyl radicals, in living cells. Detection is usually performed on cell suspensions introduced in glass capillaries, gas-permeable tubing, or flat cells, even when cells normally require attachment for growth. However, radical production may be influenced by cell adhesion, while enzymatic or mechanical cell harvesting may damage the cells and alter their metabolic rates. Here, we describe the detection on adherent cells attached to microscope coverslip glasses. This method preserves cell integrity, ensures near physiological conditions for naturally adherent cells, and is relatively simple to set up. Up to 12 conditions can be screened in half a day using a single batch of culture cells.
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Antonopoulou M, Ioannidis N, Kaloudis T, Triantis TM, Hiskia A. Kinetic and mechanistic investigation of water taste and odor compound 2-isopropyl-3-methoxy pyrazine degradation using UV-A/Chlorine process. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 732:138404. [PMID: 32474265 DOI: 10.1016/j.scitotenv.2020.138404] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 03/31/2020] [Accepted: 03/31/2020] [Indexed: 06/11/2023]
Abstract
The present study was launched as a continuation of global efforts to tackle problems associated with two important aesthetic characteristics, taste and odor (T&O), of drinking water. The UV-A/Chlorine process, a promising advanced oxidation process (AOP), was evaluated for the first time for the removal of 2-isopropyl-3-methoxy pyrazine (IPMP), a widely reported compound in the literature that causes unpleasant taste and odor when present in water at or below the ng L-1 level. It was found that the studied process was efficient for the removal of IPMP in both ultrapure and drinking water. The initial chlorine dosage influenced significantly the degradation efficiency under initial neutral pH values. Degradation efficiency of IPMP was slightly inhibited by using drinking water as matrix. Scavenging experiments highlighted the significant role of various reactive species (e.g. HO, ClO, Cl, Cl2-) generated during the process that have not been studied comprehensively until now. In addition, the significant role of HO was further verified by Electron paramagnetic resonance spectroscopy (EPR) experiments. Overall, the formation of diverse radicals during the UV-A/Chlorine treatment enhanced the degradation of IPMP, promoting mainly the formation of hydroxy, hydroperoxy and dealkylated derivatives. In contrast, chlorinated by-products were only identified in traces.
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Affiliation(s)
- Maria Antonopoulou
- Laboratory of Photo-Catalytic Processes and Environmental Chemistry, Institute of Nanoscience & Nanotechnology, NCSR "Demokritos", Patr. Gregoriou E & 27 Neapoleos Str, 15341 Agia Paraskevi, Athens, Greece.
| | - Nikolaos Ioannidis
- Laboratory of Molecular Magnetic and Bioinorganic Spectroscopy, Institute of Nanoscience & Nanotechnology, NCSR "Demokritos", Patr. Gregoriou E & 27 Neapoleos Str, 15341 Agia Paraskevi, Athens, Greece
| | - Triantafyllos Kaloudis
- Laboratory of Photo-Catalytic Processes and Environmental Chemistry, Institute of Nanoscience & Nanotechnology, NCSR "Demokritos", Patr. Gregoriou E & 27 Neapoleos Str, 15341 Agia Paraskevi, Athens, Greece
| | - Theodoros M Triantis
- Laboratory of Photo-Catalytic Processes and Environmental Chemistry, Institute of Nanoscience & Nanotechnology, NCSR "Demokritos", Patr. Gregoriou E & 27 Neapoleos Str, 15341 Agia Paraskevi, Athens, Greece
| | - Anastasia Hiskia
- Laboratory of Photo-Catalytic Processes and Environmental Chemistry, Institute of Nanoscience & Nanotechnology, NCSR "Demokritos", Patr. Gregoriou E & 27 Neapoleos Str, 15341 Agia Paraskevi, Athens, Greece
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8
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Gotham JP, Li R, Tipple TE, Lancaster JR, Liu T, Li Q. Quantitation of spin probe-detectable oxidants in cells using electron paramagnetic resonance spectroscopy: To probe or to trap? Free Radic Biol Med 2020; 154:84-94. [PMID: 32376456 PMCID: PMC7368495 DOI: 10.1016/j.freeradbiomed.2020.04.020] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 04/19/2020] [Accepted: 04/22/2020] [Indexed: 12/22/2022]
Abstract
Electron Paramagnetic Resonance (EPR) spectroscopy coupled with spin traps/probes enables quantitative determination of reactive nitrogen and oxygen species (RNOS). Even with numerous studies using spin probes, the methodology has not been rigorously investigated. The autoxidation of spin probes has been commonly overlooked. Using the spin probe 1-hydroxy-3-methoxycarbonyl-2,2,5,5-tetramethylpyrrolidine (CMH), the present study has tested the effects of metal chelators, temperature, and oxygen content on the autoxidation of spin probes, where an optimized condition is refined for cell studies. The apparent rate of CMH autoxidation under this condition is 7.01 ± 1.60 nM/min, indicating low sensitivity and great variation of the CMH method and that CMH autoxidation rate should be subtracted from the generation rate of CMH-detectable oxidants (simplified as oxidants below) in samples. Oxidants in RAW264.7 cells are detected at an initial rate of 4.0 ± 0.7 pmol/min/106 cells, which is not considered as the rate of basal oxidants generation because the same method has failed to detect oxidant generation from the stimulation of phorbol-12-mysirate-13-acetate (PMA, 0.1 nmol/106 cells) in cells (2.5 ± 0.9 for PMA vs. 2.1 ± 1.5 pmol/min/106 cells for dimethyl sulfoxide (DMSO)-treated cells). In contrast, the spin trap 5,5-dimethyl-1-pyrroline-N-oxide (DMPO), which exhibits minimal autoxidation, reveals differences between PMA and DMSO treatment (0.26 ± 0.09 vs. -0.06 ± 0.12 pmol/min/106 cells), which challenges previous claims that spin probes are more sensitive than spin traps. We have also found that low temperature EPR measurements of frozen samples of CMH autoxidation provide lower signal intensity and greater variation compared to RT measurements of fresh samples. The current study establishes an example for method development of RNOS detection, where experimental details are rigorously considered and tested, and raises questions on the applications of spin probes and spin traps.
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Affiliation(s)
- John P Gotham
- Science and Technology Honors College, University of Alabama at Birmingham, Birmingham, AL, 35294, USA; Division of Neonatology, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Rui Li
- Division of Neonatology, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Trent E Tipple
- Division of Neonatology, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Jack R Lancaster
- Department of Pharmacology & Chemical Biology, Medicine, and Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, 15261, USA
| | - Taiming Liu
- Department of Pediatrics, Division of Neonatology, Loma Linda University School of Medicine, Loma Linda, CA, 92354, USA
| | - Qian Li
- Division of Neonatology, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL, 35294, USA.
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Castro Marín A, Culcasi M, Cassien M, Stocker P, Thétiot-Laurent S, Robillard B, Chinnici F, Pietri S. Chitosan as an antioxidant alternative to sulphites in oenology: EPR investigation of inhibitory mechanisms. Food Chem 2019; 285:67-76. [PMID: 30797377 DOI: 10.1016/j.foodchem.2019.01.155] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 01/21/2019] [Accepted: 01/22/2019] [Indexed: 01/09/2023]
Abstract
The efficacy against oxidative degradation in model and sulphite-free white wines of two commercial, insoluble chitosans (one being approved for winemaking) were investigated by electron paramagnetic resonance (EPR). Both compounds at various doses significantly inhibited the formation of α-(4-pyridyl-1-oxide)-N-t-butylnitrone (4-POBN)-1-hydroxyethyl adducts under normal wine storage conditions. Pre-incubation with 2 g/L chitosan followed by filtration had a better effect than adding 50 mg/L sulphur dioxide to the experimental Chardonnay wine on the release of 4-POBN adducts after 6 days of incubation with 100 μM iron(II). In a relevant photooxidative system acetaldehyde formation was significantly reduced after 6 days of incubation. Parallel EPR tests were performed to assess the importance of metal chelation (iron and copper) versus direct scavenging of hydroxyl radicals on the effect of chitosan. The present data support the potentiality of using biocompatible chitosan as a healthier complement and/or alternative to sulphur dioxide against white wine oxidative spoilage.
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Affiliation(s)
- Antonio Castro Marín
- Aix Marseille Univ, CNRS, ICR, Marseille, France; Department of Agricultural and Food Sciences, University of Bologna, Bologna, Italy
| | | | | | | | | | | | - Fabio Chinnici
- Department of Agricultural and Food Sciences, University of Bologna, Bologna, Italy
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10
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Tam TLD, Xu JW. The role of fluoride in anion–π interaction with naphthalene diimide. Chem Commun (Camb) 2019; 55:6225-6228. [DOI: 10.1039/c9cc01795j] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The role of fluoride in anion–π interaction with naphthalene diimide (NDI) is dependent on the solvent used.
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Affiliation(s)
- Teck Lip Dexter Tam
- Institute of Materials Research and Engineering (IMRE)
- Agency of Science
- Technology and Research (A*STAR)
- Singapore 138634
- Singapore
| | - Jian Wei Xu
- Institute of Materials Research and Engineering (IMRE)
- Agency of Science
- Technology and Research (A*STAR)
- Singapore 138634
- Singapore
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11
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Štarha P, Trávníček Z, Herchel R, Jewula P, Dvořák Z. A potential method to improve the in vitro cytotoxicity of half-sandwich Os(ii) complexes against A2780 cells. Dalton Trans 2018; 47:5714-5724. [DOI: 10.1039/c8dt00193f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
[Os(η6-pcym)(dpa)(VP)]PF6 (1-VP), containing the histone deacetylase inhibitor valproate, shows ca. 3-fold higher in vitro cytotoxicity against the A2780 human ovarian carcinoma cells than its chlorido analogue [Os(η6-pcym)(dpa)Cl]PF6 (1-Cl).
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Affiliation(s)
- Pavel Štarha
- Department of Inorganic Chemistry & Regional Centre of Advanced Technologies and Materials
- Faculty of Science
- Palacký University in Olomouc
- 771 46 Olomouc
- Czech Republic
| | - Zdeněk Trávníček
- Department of Inorganic Chemistry & Regional Centre of Advanced Technologies and Materials
- Faculty of Science
- Palacký University in Olomouc
- 771 46 Olomouc
- Czech Republic
| | - Radovan Herchel
- Department of Inorganic Chemistry & Regional Centre of Advanced Technologies and Materials
- Faculty of Science
- Palacký University in Olomouc
- 771 46 Olomouc
- Czech Republic
| | - Pawel Jewula
- Department of Inorganic Chemistry & Regional Centre of Advanced Technologies and Materials
- Faculty of Science
- Palacký University in Olomouc
- 771 46 Olomouc
- Czech Republic
| | - Zdeněk Dvořák
- Department of Cell Biology and Genetics & Regional Centre of Advanced Technologies and Materials
- Faculty of Science
- Palacký University in Olomouc
- 783 71 Olomouc
- Czech Republic
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12
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Mousslim M, Pagano A, Andreotti N, Garrouste F, Thuault S, Peyrot V, Parat F, Luis J, Culcasi M, Thétiot-Laurent S, Pietri S, Sabatier JM, Kovacic H. Peptide screen identifies a new NADPH oxidase inhibitor: impact on cell migration and invasion. Eur J Pharmacol 2017; 794:162-172. [DOI: 10.1016/j.ejphar.2016.10.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 10/07/2016] [Accepted: 10/10/2016] [Indexed: 02/07/2023]
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A Abdel-Rahman E, Mahmoud AM, Khalifa AM, Ali SS. Physiological and pathophysiological reactive oxygen species as probed by EPR spectroscopy: the underutilized research window on muscle ageing. J Physiol 2016; 594:4591-613. [PMID: 26801204 DOI: 10.1113/jp271471] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Accepted: 12/04/2015] [Indexed: 12/18/2022] Open
Abstract
Reactive oxygen and nitrogen species (ROS and RNS) play crucial roles in triggering, mediating and regulating physiological and pathophysiological signal transduction pathways within the cell. Within the cell, ROS efflux is firmly controlled both spatially and temporally, making the study of ROS dynamics a challenging task. Different approaches have been developed for ROS assessment; however, many of these assays are not capable of direct identification or determination of subcellular localization of different ROS. Here we highlight electron paramagnetic resonance (EPR) spectroscopy as a powerful technique that is uniquely capable of addressing questions on ROS dynamics in different biological specimens and cellular compartments. Due to their critical importance in muscle functions and dysfunction, we discuss in some detail spin trapping of various ROS and focus on EPR detection of nitric oxide before highlighting how EPR can be utilized to probe biophysical characteristics of the environment surrounding a given stable radical. Despite the demonstrated ability of EPR spectroscopy to provide unique information on the identity, quantity, dynamics and environment of radical species, its applications in the field of muscle physiology, fatiguing and ageing are disproportionately infrequent. While reviewing the limited examples of successful EPR applications in muscle biology we conclude that the field would greatly benefit from more studies exploring ROS sources and kinetics by spin trapping, protein dynamics by site-directed spin labelling, and membrane dynamics and global redox changes by spin probing EPR approaches.
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Affiliation(s)
- Engy A Abdel-Rahman
- Center for Aging and Associated Diseases, Helmy Institute of Medical Sciences, Zewail City of Science and Technology, Giza, Egypt
| | - Ali M Mahmoud
- Center for Aging and Associated Diseases, Helmy Institute of Medical Sciences, Zewail City of Science and Technology, Giza, Egypt
| | - Abdulrahman M Khalifa
- Center for Aging and Associated Diseases, Helmy Institute of Medical Sciences, Zewail City of Science and Technology, Giza, Egypt
| | - Sameh S Ali
- Center for Aging and Associated Diseases, Helmy Institute of Medical Sciences, Zewail City of Science and Technology, Giza, Egypt
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Abbas K, Hardy M, Poulhès F, Karoui H, Tordo P, Ouari O, Peyrot F. Medium-throughput ESR detection of superoxide production in undetached adherent cells using cyclic nitrone spin traps. Free Radic Res 2015; 49:1122-8. [PMID: 25968949 DOI: 10.3109/10715762.2015.1045504] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Spin trapping with cyclic nitrones coupled to electron spin resonance (ESR) is recognized as a specific method of detection of oxygen free radicals in biological systems, especially in culture cells. In this case, the detection is usually performed on cell suspensions, which is however unsuitable when adhesion influences free radical production. Here, we performed ESR detection of superoxide with four spin traps (5-diethoxyphosphoryl-5-methyl-1-pyrroline N-oxide, DEPMPO; 5-diisopropoxyphosphoryl-5-methyl-1-pyrroline N-oxide, DIPPMPO; (4R*, 5R*)-5-(diisopropyloxyphosphoryl)-5-methyl-4-[({[2-(triphenylphosphonio)ethyl]carbamoyl}oxy)methyl]pyrroline N-oxide bromide, Mito-DIPPMPO; and 6-monodeoxy-6-mono-4-[(5-diisopropoxyphosphoryl-5-methyl-1-pyrroline-N-oxide)-ethylenecarbamoyl-(2,3-di-O-methyl) hexakis (2,3,6-tri-O-methyl)]-β-cyclodextrin, CD-DIPPMPO) directly on RAW 264.7 macrophages cultured on microscope coverslip glasses after phorbol 12-myristate 13-acetate (PMA) stimulation. Distinct ESR spectra were obtained with each spin trap using this method. CD-DIPPMPO, a recently published phosphorylated cyclic nitrone bearing a permethylated β-cyclodextrin moiety, was confirmed as the most specific spin trap of the superoxide radical, with exclusive detection of the superoxide adduct. ESR detection performed on cells attached to coverslips represents significant advances over other methods in terms of simplicity, speed, and measurement under near-physiological conditions. It thus opens the way for numerous applications, such as medium-throughput screening of antioxidants and reactive oxygen species (ROS)-modulating agents.
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Affiliation(s)
- K Abbas
- LCBPT, UMR 8601 CNRS - Paris Descartes University , Sorbonne Paris Cité, Paris , France
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15
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Fingerprinting of hydroxyl radical-attacked polysaccharides by N-isopropyl-2-aminoacridone labelling. Biochem J 2014; 463:225-37. [PMID: 25072268 PMCID: PMC4170706 DOI: 10.1042/bj20140678] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Hydroxyl radicals (•OH) cause non-enzymic scission of polysaccharides in diverse biological systems. Such reactions can be detrimental (e.g. causing rheumatic and arthritic diseases in mammals) or beneficial (e.g. promoting the softening of ripening fruit, and biomass saccharification). Here we present a method for documenting •OH action, based on fluorescent labelling of the oxo groups that are introduced as glycosulose residues when •OH attacks polysaccharides. The method was tested on several polysaccharides, especially pectin, after treatment with Fenton reagents. 2-Aminoacridone plus cyanoborohydride reductively aminated the oxo groups in treated polysaccharides; the product was then reacted with acetone plus cyanoborohydride, forming a stable tertiary amine with the carbohydrate linked to N-isopropyl-2-aminoacridone (pAMAC). Digestion of labelled pectin with ‘Driselase’ yielded several fluorescent products which on electrophoresis and HPLC provided a useful ‘fingerprint’ indicating •OH attack. The most diagnostic product was a disaccharide conjugate of the type pAMAC·UA-GalA (UA=unspecified uronic acid), whose UA-GalA bond was Driselase-resistant (product 2A). 2A was clearly distinguishable from GalA-GalA–pAMAC (disaccharide labelled at its reducing end), which was digestible to GalA–pAMAC. The methodology is applicable, with appropriate enzymes in place of Driselase, for detecting natural and artificial •OH attack in diverse plant, animal and microbial polysaccharides. Non-enzymic scission of polysaccharides by hydroxyl radicals (•OH) may be biologically detrimental or beneficial. We present a ‘fingerprinting’ method for detecting polysaccharides that have been •OH-attacked. The method detects the glycosulose residues introduced by •OH action.
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16
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Dvoranová D, Barbieriková Z, Brezová V. Radical intermediates in photoinduced reactions on TiO2 (an EPR spin trapping study). Molecules 2014; 19:17279-304. [PMID: 25353381 PMCID: PMC6271711 DOI: 10.3390/molecules191117279] [Citation(s) in RCA: 141] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Revised: 09/29/2014] [Accepted: 10/22/2014] [Indexed: 01/10/2023] Open
Abstract
The radical intermediates formed upon UVA irradiation of titanium dioxide suspensions in aqueous and non-aqueous environments were investigated applying the EPR spin trapping technique. The results showed that the generation of reactive species and their consecutive reactions are influenced by the solvent properties (e.g., polarity, solubility of molecular oxygen, rate constant for the reaction of hydroxyl radicals with the solvent). The formation of hydroxyl radicals, evidenced as the corresponding spin-adducts, dominated in the irradiated TiO2 aqueous suspensions. The addition of 17O-enriched water caused changes in the EPR spectra reflecting the interaction of an unpaired electron with the 17O nucleus. The photoexcitation of TiO2 in non-aqueous solvents (dimethylsulfoxide, acetonitrile, methanol and ethanol) in the presence of 5,5-dimethyl-1-pyrroline N-oxide spin trap displayed a stabilization of the superoxide radical anions generated via electron transfer reaction to molecular oxygen, and various oxygen- and carbon-centered radicals from the solvents were generated. The character and origin of the carbon-centered spin-adducts was confirmed using nitroso spin trapping agents.
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Affiliation(s)
- Dana Dvoranová
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, Bratislava SK-812 37, Slovakia
| | - Zuzana Barbieriková
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, Bratislava SK-812 37, Slovakia
| | - Vlasta Brezová
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, Bratislava SK-812 37, Slovakia.
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17
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Abbas K, Hardy M, Poulhès F, Karoui H, Tordo P, Ouari O, Peyrot F. Detection of superoxide production in stimulated and unstimulated living cells using new cyclic nitrone spin traps. Free Radic Biol Med 2014; 71:281-290. [PMID: 24662195 DOI: 10.1016/j.freeradbiomed.2014.03.019] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Revised: 03/11/2014] [Accepted: 03/17/2014] [Indexed: 10/25/2022]
Abstract
Reactive oxygen species (ROS), including superoxide anion and hydrogen peroxide (H2O2), have a diverse array of physiological and pathological effects within living cells depending on the extent, timing, and location of their production. For measuring ROS production in cells, the ESR spin trapping technique using cyclic nitrones distinguishes itself from other methods by its specificity for superoxide and hydroxyl radical. However, several drawbacks, such as the low spin trapping rate and the spontaneous and cell-enhanced decomposition of the spin adducts to ESR-silent products, limit the application of this method to biological systems. Recently, new cyclic nitrones bearing a triphenylphosphonium (Mito-DIPPMPO) or a permethylated β-cyclodextrin moiety (CD-DIPPMPO) have been synthesized and their spin adducts demonstrated increased stability in buffer. In this study, a comparison of the spin trapping efficiency of these new compounds with commonly used cyclic nitrone spin traps, i.e., 5,5-dimethyl-1-pyrroline N-oxide (DMPO), and analogs BMPO, DEPMPO, and DIPPMPO, was performed on RAW 264.7 macrophages stimulated with phorbol 12-myristate 13-acetate. Our results show that Mito-DIPPMPO and CD-DIPPMPO enable a higher detection of superoxide adduct, with a low (if any) amount of hydroxyl adduct. CD-DIPPMPO, especially, appears to be a superior spin trap for extracellular superoxide detection in living macrophages, allowing measurement of superoxide production in unstimulated cells for the first time. The main rationale put forward for this extreme sensitivity is that the extracellular localization of the spin trap prevents the reduction of the spin adducts by ascorbic acid and glutathione within cells.
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Affiliation(s)
- Kahina Abbas
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), Université Paris Descartes, Sorbonne Paris Cité, 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
| | - Fabienne Peyrot
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), Université Paris Descartes, Sorbonne Paris Cité, 75006 Paris, France; ESPE de l׳Académie de Paris, Université Paris Sorbonne, 75016 Paris, France.
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18
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Culcasi M, Casano G, Lucchesi C, Mercier A, Clément JL, Pique V, Michelet L, Krieger-Liszkay A, Robin M, Pietri S. Synthesis and Biological Characterization of New Aminophosphonates for Mitochondrial pH Determination by 31P NMR Spectroscopy. J Med Chem 2013; 56:2487-99. [DOI: 10.1021/jm301866e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Marcel Culcasi
- Aix-Marseille Université, CNRS UMR 7273, Equipe Sondes Moléculaires en Biologie et
Stress Oxydant, Institut de Chimie Radicalaire, Marseille, France
| | - Gilles Casano
- Aix-Marseille Université, CNRS UMR 7273, Equipe Sondes Moléculaires en Biologie et
Stress Oxydant, Institut de Chimie Radicalaire, Marseille, France
| | - Céline Lucchesi
- Aix-Marseille Université, CNRS UMR 7273, Equipe Sondes Moléculaires en Biologie et
Stress Oxydant, Institut de Chimie Radicalaire, Marseille, France
| | - Anne Mercier
- Aix-Marseille Université, CNRS UMR 7273, Equipe Sondes Moléculaires en Biologie et
Stress Oxydant, Institut de Chimie Radicalaire, Marseille, France
| | - Jean-Louis Clément
- Aix-Marseille Université, CNRS UMR 7273, Equipe Sondes Moléculaires en Biologie et
Stress Oxydant, Institut de Chimie Radicalaire, Marseille, France
| | - Valérie Pique
- Aix-Marseille Université, CNRS UMR 7273, Equipe Sondes Moléculaires en Biologie et
Stress Oxydant, Institut de Chimie Radicalaire, Marseille, France
| | - Laure Michelet
- CNRS UMR 8221, Institut de Biologie et de Technologie de Saclay (iBiTec-S),
CEA Saclay, Gif-sur-Yvette, France
| | - Anja Krieger-Liszkay
- CNRS UMR 8221, Institut de Biologie et de Technologie de Saclay (iBiTec-S),
CEA Saclay, Gif-sur-Yvette, France
| | - Maxime Robin
- Aix-Marseille Université, CNRS UMR 7273, Equipe Sondes Moléculaires en Biologie et
Stress Oxydant, Institut de Chimie Radicalaire, Marseille, France
| | - Sylvia Pietri
- Aix-Marseille Université, CNRS UMR 7273, Equipe Sondes Moléculaires en Biologie et
Stress Oxydant, Institut de Chimie Radicalaire, Marseille, France
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19
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Culcasi M, Benameur L, Mercier A, Lucchesi C, Rahmouni H, Asteian A, Casano G, Botta A, Kovacic H, Pietri S. EPR spin trapping evaluation of ROS production in human fibroblasts exposed to cerium oxide nanoparticles: Evidence for NADPH oxidase and mitochondrial stimulation. Chem Biol Interact 2012; 199:161-76. [DOI: 10.1016/j.cbi.2012.08.007] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Revised: 07/31/2012] [Accepted: 08/03/2012] [Indexed: 02/02/2023]
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20
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Patel A, Rohr-Udilova N, Rosenau T, Stolze K. Synthesis and characterization of 5-alkoxycarbonyl-4-hydroxymethyl-5-alkyl-pyrroline N-oxide derivatives. Bioorg Med Chem 2011; 19:7643-52. [PMID: 22094277 DOI: 10.1016/j.bmc.2011.10.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2011] [Revised: 09/12/2011] [Accepted: 10/07/2011] [Indexed: 10/16/2022]
Abstract
The syntheses, analytical properties, and spin trapping behavior of four novel EMPO derivatives, namely 5-ethoxycarbonyl-4-hydroxymethyl-5-methyl-pyrroline N-oxide (EHMPO), 5-ethoxycarbonyl-5-ethyl-4-hydroxymethyl-pyrroline N-oxide (EEHPO), 4-hydroxymethyl-5-methyl-5-propoxycarbonyl-pyrroline N-oxide (HMPPO), and 4-hydroxymethyl-5-methyl-5-iso-propoxycarbonyl-pyrroline N-oxide (HMiPPO), towards different oxygen- and carbon-centered radicals are described.
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Affiliation(s)
- Anjan Patel
- Department of Chemistry, University of Natural Resources and Life Sciences (BOKU), Muthgasse 18, A-1190 Vienna, Austria
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21
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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22
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N'guessan P, Pouyet L, Gosset G, Hamlaoui S, Seillier M, Cano CE, Seux M, Stocker P, Culcasi M, Iovanna JL, Dusetti NJ, Pietri S, Carrier A. Absence of tumor suppressor tumor protein 53-induced nuclear protein 1 (TP53INP1) sensitizes mouse thymocytes and embryonic fibroblasts to redox-driven apoptosis. Antioxid Redox Signal 2011; 15:1639-53. [PMID: 21235351 DOI: 10.1089/ars.2010.3553] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The p53-transcriptional target TP53INP1 is a potent stress-response protein promoting p53 activity. We previously showed that ectopic overexpression of TP53INP1 facilitates cell cycle arrest as well as cell death. Here we report a study investigating cell death in mice deficient for TP53INP1. Surprisingly, we found enhanced stress-induced apoptosis in TP53INP1-deficient cells. This observation is underpinned in different cell types in vivo (thymocytes) and in vitro (thymocytes and MEFs), following different types of injury inducing either p53-dependent or -independent cell death. Nevertheless, absence of TP53INP1 is unable to overcome impaired cell death of p53-deficient thymocytes. Stress-induced ROS production is enhanced in the absence of TP53INP1, and antioxidant NAC complementation abolishes increased sensitivity to apoptosis of TP53INP1-deficient cells. Furthermore, antioxidant defenses are defective in TP53INP1-deficient mice in correlation with ROS dysregulation. Finally, we show that autophagy is reduced in TP53INP1-deficient cells both at the basal level and upon stress. Altogether, these data show that impaired ROS regulation in TP53INP1-deficient cells is responsible for their sensitivity to induced apoptosis. In addition, they suggest that this sensitivity could rely on a defect of autophagy. Therefore, these data emphasize the role of TP53INP1 in protection against cell injury.
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Affiliation(s)
- Prudence N'guessan
- INSERM U624 Stress cellulaire, Case 915 Parc Scientifique de Luminy, Marseille Cedex 9, France
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23
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Dikalov SI, Kirilyuk IA, Voinov M, Grigor’ev IA. EPR detection of cellular and mitochondrial superoxide using cyclic hydroxylamines. Free Radic Res 2011; 45:417-30. [PMID: 21128732 PMCID: PMC4210377 DOI: 10.3109/10715762.2010.540242] [Citation(s) in RCA: 122] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Superoxide (O₂ⁱ⁻) has been implicated in the pathogenesis of many human diseases, but detection of the O(2)(•-) radicals in biological systems is limited due to inefficiency of O₂ⁱ⁻ spin trapping and lack of site-specific information. This work studied production of extracellular, intracellular and mitochondrial O₂ⁱ⁻ in neutrophils, cultured endothelial cells and isolated mitochondria using a new set of cationic, anionic and neutral hydroxylamine spin probes with various lipophilicity and cell permeability. Cyclic hydroxylamines rapidly react with O₂ⁱ⁻, producing stable nitroxides and allowing site-specific cO₂ⁱ⁻ detection in intracellular, extracellular and mitochondrial compartments. Negatively charged 1-hydroxy-4-phosphono-oxy-2,2,6,6-tetramethylpiperidine (PP-H) and positively charged 1-hydroxy-2,2,6,6-tetramethylpiperidin-4-yl-trimethylammonium (CAT1-H) detected only extramitochondrial O₂ⁱ⁻. Inhibition of EPR signal by SOD2 over-expression showed that mitochondria targeted mitoTEMPO-H detected intramitochondrial O₂ⁱ⁻ both in isolated mitochondria and intact cells. Both 1-hydroxy-3-carboxy-2,2,5,5-tetramethylpyrrolidine (CP-H) and 1-hydroxy-3-methoxycarbonyl-2,2,5,5-tetramethylpyrrolidine (CM-H) detected an increase in cytoplasm O₂ⁱ⁻ stimulated by PMA, but only CM-H and mitoTEMPO-H showed an increase in rotenone-induced mitochondrial O₂ⁱ⁻. These data show that a new set of hydroxylamine spin probes provide unique information about site-specific production of the O₂ⁱ⁻ radical in extracellular or intracellular compartments, cytoplasm or mitochondria.
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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] [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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25
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Yıldırım I, Karabulut B. EPR study of gamma irradiated N-methyl taurine (C3H9NO3S) and sodium hydrogen sulphate monohydrate (NaHSO3·H2O) single crystals. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 78:1023-1026. [PMID: 21242099 DOI: 10.1016/j.saa.2010.12.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2010] [Revised: 12/02/2010] [Accepted: 12/11/2010] [Indexed: 05/30/2023]
Abstract
EPR study of gamma irradiated C(3)H(9)NO(3)S and NaHSO(3).H(2)O single crystals have been carried out at room temperature. There is one site for the radicals in C(3)H(9)NO(3)S and two magnetically distinct sites for the radicals in NaHSO(3). The observed lines in the EPR spectra have been attributed to the species of SO(3)(-) and RH radicals for N-methyl taurine, and to the SO(3)(-) and OH radicals for sodium hydrogen sulfate monohydrate single crystals. The principal values of the g for SO(3)(-), the hyperfine values of RH and OH proton splitting have been calculated and discussed.
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Affiliation(s)
- Ilkay Yıldırım
- Ondokuz Mayıs University, Faculty of Art and Sciences, Department of Physics, Samsun, Turkey
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26
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Stolze K, Rohr-Udilova N, Patel A, Rosenau T. Synthesis and characterization of 5-hydroxymethyl-5-methyl-pyrroline N-oxide and its derivatives. Bioorg Med Chem 2011; 19:985-93. [PMID: 21211983 DOI: 10.1016/j.bmc.2010.11.052] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2010] [Revised: 11/17/2010] [Accepted: 11/20/2010] [Indexed: 11/24/2022]
Abstract
Synthesis and spin trapping behavior of three novel DMPO derivatives, namely 5-hydroxymethyl-5-methyl-pyrroline N-oxide (HMMPO), 5-(2-furanyl)-oxymethyl-5-methyl-pyrroline N-oxide (FMMPO), and 5-(2-pyranyl)-oxymethyl-5-methyl-pyrroline N-oxide (PMMPO) towards different oxygen- and carbon-centered radicals are described. The stabilizing effect of a series of cyclodextrins on the superoxide adducts was tested.
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Affiliation(s)
- Klaus Stolze
- Department of Biomedical Sciences, University of Veterinary Medicine Vienna, Austria.
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27
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Heyno E, Gross CM, Laureau C, Culcasi M, Pietri S, Krieger-Liszkay A. Plastid alternative oxidase (PTOX) promotes oxidative stress when overexpressed in tobacco. J Biol Chem 2009; 284:31174-80. [PMID: 19740740 PMCID: PMC2781516 DOI: 10.1074/jbc.m109.021667] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2009] [Revised: 09/01/2009] [Indexed: 11/06/2022] Open
Abstract
Photoinhibition and production of reactive oxygen species were studied in tobacco plants overexpressing the plastid terminal oxidase (PTOX). In high light, these plants was more susceptible to photoinhibition than wild-type plants. Also oxygen-evolving activity of isolated thylakoid membranes from the PTOX-overexpressing plants was more strongly inhibited in high light than in thylakoids from wild-type plants. In contrast in low light, in the PTOX overexpressor, the thylakoids were protected against photoinhibition while in wild type they were significantly damaged. The production of superoxide and hydroxyl radicals was shown by EPR spin-trapping techniques in the different samples. Superoxide and hydroxyl radical production was stimulated in the overexpressor. Two-thirds of the superoxide production was maintained in the presence of DNP-INT, an inhibitor of the cytochrome b(6)f complex. No increase of the SOD content was observed in the overexpressor compared with the wild type. We propose that superoxide is produced by PTOX in a side reaction and that PTOX can only act as a safety valve under stress conditions when the generated superoxide is detoxified by an efficient antioxidant system.
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Affiliation(s)
- Eiri Heyno
- From the Commissariat à l'Energie Atomique (CEA), iBiTecS, CNRS URA 2096, Service de Bioénergétique Biologie Structurale et Mécanisme, 91191 Gif-sur-Yvette Cedex
| | - Christine M. Gross
- From the Commissariat à l'Energie Atomique (CEA), iBiTecS, CNRS URA 2096, Service de Bioénergétique Biologie Structurale et Mécanisme, 91191 Gif-sur-Yvette Cedex
| | - Constance Laureau
- the Laboratoire d'Ecologie, Systématique et Evolution, CNRS-UMR 8079-IFR 87, Université Paris XI, 91405 Orsay Cedex, and
| | - Marcel Culcasi
- the Sondes Moléculaires en Biologie-Laboratoire Chimie Provence, CNRS UMR 6264, 13397 Marseille Cedex 20, France
| | - Sylvia Pietri
- the Sondes Moléculaires en Biologie-Laboratoire Chimie Provence, CNRS UMR 6264, 13397 Marseille Cedex 20, France
| | - Anja Krieger-Liszkay
- From the Commissariat à l'Energie Atomique (CEA), iBiTecS, CNRS URA 2096, Service de Bioénergétique Biologie Structurale et Mécanisme, 91191 Gif-sur-Yvette Cedex
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Stolze K, Rohr-Udilova N, Hofinger A, Rosenau T. Synthesis and characterization of several carbamoyl- and methylcarbamoyl-substituted EMPO derivatives. Bioorg Med Chem 2009; 17:7572-84. [DOI: 10.1016/j.bmc.2009.09.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2009] [Revised: 08/05/2009] [Accepted: 09/03/2009] [Indexed: 10/20/2022]
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Zalibera M, Rapta P, Staško A, Brindzová L, Brezová V. Thermal generation of stable spin trap adducts with super-hyperfine structure in their EPR spectra: An alternative EPR spin trapping assay for radical scavenging capacity determination in dimethylsulphoxide. Free Radic Res 2009; 43:457-69. [DOI: 10.1080/10715760902846140] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Alencar J, Gosset G, Robin M, Pique V, Culcasi M, Clément JL, Mercier A, Pietri S. Improving the stability and antioxidant properties of sesame oil: water-soluble spray-dried emulsions from new transesterified phenolic derivatives. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2009; 57:7311-7323. [PMID: 19653627 DOI: 10.1021/jf9010627] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Hydrosoluble sesame oil fatty acid transesters having enhanced antioxidant activities were synthesized in a two-step process. The key step involved the biocatalyzed (lipase from Candida antarctica) acylation of sesame oil methanolic ester with either vanillyl (VNA) or piperonyl benzylic alcohols, or 5-hydroxymethyl resorcinol (5-HMR). These substrates were selected to introduce phenolic or sesamol structurally related frameworks. The VNA and 5-HMR-derived transesters were obtained with 20-40% yields and retained the starting proportions of sesame oil linoleic, oleic, and saturated acids, these fatty acids also being the only constituents of the nonesterified fraction. The VNA-derived transester showed the best antioxidant capacity in standard assays and was processed as the unique lipid phase of spray-dried emulsions containing a high level of linoleic acid phenolic ester. These emulsions provided a high degree of protection to UV-irradiated fibroblasts, through the potential synergy between VNA antioxidant action and replenishment of damaged membranes by unsaturated fatty acids.
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Affiliation(s)
- Juliana Alencar
- Sondes Moléculaires en Biologie, Laboratoire Chimie Provence, UMR 6264 CNRS-Universités d'Aix-Marseille, av. Escadrille Normandie-Niemen, Marseille Cedex 20, France
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Lu X, Hua Z, Du G, Ma X, Cao J, Yang Z, Chen J. Scavenging of free radicals in gas-phase mainstream cigarette smoke by immobilized catalase at filter level. Free Radic Res 2009; 42:244-52. [DOI: 10.1080/10715760801911631] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Reis A, Domingues MRM, Amado FML, Manuel Oliveira M, Domingues P. Detection and characterization of cyclic hydroxylamine adducts by mass spectrometry. Free Radic Res 2009; 42:481-91. [DOI: 10.1080/10715760802112783] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Reis A, Domingues MRM, Oliveira MM, Domingues P. Identification of free radicals by spin trapping with DEPMPO and MCPIO using tandem mass spectrometry. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2009; 15:689-703. [PMID: 19940335 DOI: 10.1255/ejms.1026] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
This study evaluates the use of a pyrroline (DEPMPO) and an imidazole (MCPIO) spin trap for the detection of hydroxyl and biomolecule (a peptide and a phospholipid) free radical adducts by Electrospray Ionization Mass Spectrometry (ESI-MS). The hydroxyl and biomolecule free radical adducts were detected using a QTOF and a linear ion trap (LIT) mass spectrometers. In the presence of hydroxyl radical, the mass spectrum obtained for each of the spin traps, DEPMPO and MCPIO, showed the presence of ions that could be attributed to hydroxyl and peroxyl radicals. Further characterisation by tandem mass spectrometry (ESI-MS/MS) revealed also the presence of hydroxy-hydroxyl adducts. Based on the results here described, we show that DEPMPO is a better spin trap for free radicals trapping and detection by mass spectrometry mainly because adducts show increased signal intensity. The ESI-MS spectra obtained for DEPMPO and MCPIO in the presence of biomolecule radicals (peptide and phospholipid) show molecular ions of DEPMPO and MCPIO adducts, which were characterised by tandem mass spectrometry. Both carbon centered radicals and oxygen centered radicals were efficiently trapped by the two spin traps and analysis of QTOF-MS/MS mass spectra allowed the location of the radical position in either the peptide or in the phospholipid fatty acyl chain. However, the tandem mass spectra of MCPIO adducts were more informative than DEPMPO adducts. The LIT-MS/MS spectra only shows typical peptide and phospholipid fragmentation, which difficult the structural characterisation of the spin adduct. In this study, the DEPMPO and MCPIO adducts were identified either in the nitrone or in the hydroxylamine form, which are ESR silent forms. The results described here show that both spin traps coupled with detection by mass spectrometry are valuable tools for trapping radicals of biomolecules. Furthermore, the acquired data provide valuable information on the presence of adducts (hydroxyl and biomolecule) that are Electron Spin Resonance (ESR) silent. This is especially important considering the complexity of the radical species in biological environment and the presence of reducing compounds that convert the spin adducts to silent ESR forms.
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Affiliation(s)
- Ana Reis
- Mass Spectrometry Center, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
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Cano CE, Gommeaux J, Pietri S, Culcasi M, Garcia S, Seux M, Barelier S, Vasseur S, Spoto RP, Pébusque MJ, Dusetti NJ, Iovanna JL, Carrier A. Tumor protein 53-induced nuclear protein 1 is a major mediator of p53 antioxidant function. Cancer Res 2009; 69:219-26. [PMID: 19118006 DOI: 10.1158/0008-5472.can-08-2320] [Citation(s) in RCA: 117] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
p53 exerts its tumor suppressor function mainly through transcriptional induction of target genes involved in several processes, including cell cycle checkpoints, apoptosis, and regulation of cell redox status. p53 antioxidant function is dependent on its transcriptional activity and proceeds by sequential induction of antioxidant and proapoptotic targets. However, none of the thus far renowned p53 targets have proved able to abolish on their own the intracellular reactive oxygen species (ROS) accumulation caused by p53 deficiency, therefore pointing to the existence of other prominent and yet unknown p53 antioxidant targets. Here, we show that TP53INP1 represents such a target. Indeed, TP53INP1 transcript induction on oxidative stress is strictly dependent on p53. Mouse embryonic fibroblasts (MEF) and splenocytes derived from TP53INP1-deficient (inp1(-/-)) mice accumulate intracellular ROS, whereas overexpression of TP53INP1 in p53-deficient MEFs rescues ROS levels to those of p53-proficient cells, indicating that TP53INP1 antioxidant function is p53 independent. Furthermore, accumulation of ROS in inp1(-/-) cells on oxidant challenge is associated with decreased expression of p53 targets p21/Cdkn1a, Sesn2, TAp73, Puma, and Bax. Mutation of p53 Ser(58) (equivalent to human p53 Ser(46)) abrogates transcription of these genes, indicating that TP53INP1-mediated p53 Ser(58) phosphorylation is implicated in this process. In addition, TP53INP1 deficiency results in an antioxidant (N-acetylcysteine)-sensitive acceleration of cell proliferation. Finally, TP53INP1 deficiency increases oxidative stress-related lymphoma incidence and decreases survival of p53(+/-) mice. In conclusion, our data show that TP53INP1 is a major actor of p53-driven oxidative stress response that possesses both a p53-independent intracellular ROS regulatory function and a p53-dependent transcription regulatory function.
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Affiliation(s)
- Carla E Cano
- Institut National de la Santé et de la Recherche Médicale, U624 Stress cellulaire, 915 Parc Scientifique de Luminy, 13288 Marseille Cedex 9, France
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Spin trapping experiments with different carbamoyl-substituted EMPO derivatives. Bioorg Med Chem 2008; 16:8082-9. [DOI: 10.1016/j.bmc.2008.07.057] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2008] [Revised: 07/17/2008] [Accepted: 07/22/2008] [Indexed: 11/22/2022]
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Alencar J, Gosset G, Rahmouni H, Culcasi M, Robin M, Reynier JP, Piccerelle P, Pietri S. Development of spray- and freeze-dried high-concentration sesamol emulsions and antioxidant evaluation in fibroblasts and UV-exposed rat skin slices. Drug Dev Res 2008. [DOI: 10.1002/ddr.20251] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Bacić G, Spasojević I, Sećerov B, Mojović M. Spin-trapping of oxygen free radicals in chemical and biological systems: new traps, radicals and possibilities. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008; 69:1354-66. [PMID: 18255335 DOI: 10.1016/j.saa.2007.09.047] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2007] [Accepted: 09/17/2007] [Indexed: 05/08/2023]
Abstract
The choice of the spin-trap that is to be applied in any EPR study represents the crossroad between a comprehensive investigation and an "ordinary" quantification of production of radicals. So, the scope of our study was to compare the performance of different spin-traps for qualitative analysis of radical-generating systems, and their ability to recognize previously unnoticed radicals. In addition, we present a brief account of the difficulties involved in the detection of oxygen-centered radicals in chemical and biological systems accompanied by the rationale for using the EPR spin-trapping technique in quantitative studies of such reactive species. Certain technical aspects of EPR experiments related to efficient trapping of free radicals in biochemical systems are also discussed. As an example we present here results obtained using EPR spectroscopy and the spin-trap DEPMPO, which show that the Fenton reaction, as well as various biological systems generate a previously unappreciated hydrogen (*H) atom.
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Affiliation(s)
- Goran Bacić
- Faculty for Physical Chemistry, Studentski trg 12-16, Belgrade 11000, Serbia.
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Rockenbauer A, Clément JL, Culcasi M, Mercier A, Tordo P, Pietri S. Combined ESR and thermodynamic studies of the superoxide adduct of 5-(diethoxyphosphoryl)-5-methyl-1-pyrroline N-oxide (DEPMPO): hindered rotation around the O-O bond evidenced by two-dimensional simulation of temperature-dependent spectra. J Phys Chem A 2007; 111:4950-7. [PMID: 17518450 DOI: 10.1021/jp070679u] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Experiments were performed to elucidate the origin of the superhyperfine structure and line width alternation (LWA) seen in the ESR spectrum of the major diastereoisomer (1) of DEPMPO-OOH, the remarkably persistent superoxide adduct of 5-(diethoxyphosphoryl)-5-methyl-1-pyrroline N-oxide (DEPMPO). Using selectively deuterated DEPMPO derivatives, we demonstrated that the superhyperfine pattern can be unambiguously attributed to long-range couplings. The recording in pyridine of highly resolved spectra in a wide temperature range, combined with two-dimensional simulation, allowed us to characterize an inverted LWA in 1 and revealed a uniform line broadening in the spectrum of the minor DEPMPO-OOH diastereoisomer (2), with both effects originating from a chemical exchange between conformers. When the individual spectra of 1 presenting LWA in the fast-exchange regime were simulated, four equally good fits were obtained and this ambiguity could be resolved by using a two-dimensional simulation technique. The thermodynamic and kinetic constants of this exchange were consistent with a rotation around the O-O bond. We propose that line broadening effects in 1 and 2 result from this O-O rotation concerted with the pseudo-rotation of the pyrrolidine ring.
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Affiliation(s)
- Antal Rockenbauer
- Chemical Research Center, Institute of Structural Chemistry, H-1025 Budapest, Pusztaszeri út 59, Hungary
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Culcasi M, Muller A, Mercier A, Clément JL, Payet O, Rockenbauer A, Marchand V, Pietri S. Early specific free radical-related cytotoxicity of gas phase cigarette smoke and its paradoxical temporary inhibition by tar: An electron paramagnetic resonance study with the spin trap DEPMPO. Chem Biol Interact 2006; 164:215-31. [PMID: 17083924 DOI: 10.1016/j.cbi.2006.09.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2006] [Revised: 09/27/2006] [Accepted: 09/29/2006] [Indexed: 11/25/2022]
Abstract
Electron paramagnetic resonance (EPR) spin trapping studies demonstrated aqueous tar particulate matter (TPM) and gas phase cigarette smoke (GPCS) to behave as different sources of free radicals in cigarette smoke (CS) but their cytotoxic implications have been only assessed in CS due to its relevance to the natural smoking process. Using a sensitive spin trapping detection with 5-(diethoxyphosphoryl)-5-methyl-1-pyrroline-N-oxide (DEPMPO), this study compared the respective roles of CS- and GPCS-derived free radicals on smoke-induced cytotoxicity and lipid peroxidation of filtered and unfiltered, machine-smoked experimental and reference cigarettes yielding a wide range of TPM yields. In buffer bubbled with CS the DEPMPO/superoxide spin adduct was the major detected nitroxide. Use of appropriate control experiments with nitric oxide radical (NO*) or carbonyl sulfide, and a computer analysis of spin adduct diastereoisomery showed that the hydroxyl radical (HO*) adduct of DEPMPO seen in GPCS-bubbled was rather related to metal-catalyzed nucleophilic synthesis than to direct HO* trapping. Unexpectedly a protective effect of TPM on murine 3T3 fibroblasts was observed in early (<3h) free radical-, GPCS-induced cell death, and carbon filtering decreased free radical formation, toxicity and lipid peroxidation in three cell lines (including human epithelial lung cells) challenged with GPCS. These results highlight an acute, free radical-dependent, harmful mechanism specific to the GPCS phase, possibly involving NO* chemistry, whose physical or chemical control may be of great interest with the aim of reducing the toxicity of smoke.
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Affiliation(s)
- Marcel Culcasi
- Laboratoire Structure et Réactivité des Espèces Paramagnétiques, Sondes Moléculaires en Biologie, CNRS-UMR 6517 Universités d'Aix-Marseille I & III, Marseille, France.
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40
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Soltés L, Stankovská M, Brezová V, Schiller J, Arnhold J, Kogan G, Gemeiner P. Hyaluronan degradation by copper(II) chloride and ascorbate: rotational viscometric, EPR spin-trapping, and MALDI–TOF mass spectrometric investigations. Carbohydr Res 2006; 341:2826-34. [PMID: 17049501 DOI: 10.1016/j.carres.2006.09.019] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2006] [Revised: 09/19/2006] [Accepted: 09/25/2006] [Indexed: 11/20/2022]
Abstract
The degradation of high-molar-mass hyaluronan (HA) by copper(II) chloride and ascorbate was studied by means of rotational viscometry. It was found that even small amounts of CuCl(2) present in the oxidative system led to the pronounced degradation of HA, reflected in a rapid decrease of the dynamic viscosity of the biopolymer solution. Such degradation was induced by free radicals generated in elevated amounts in the presence of copper ions. Electron paramagnetic resonance investigations performed on a model oxidative system containing Cu(II) and ascorbic acid proved the formation of relatively stable ascorbate anion radicals resulting from the reaction of ascorbic acid with hydroxyl radicals. In this way, by scavenging the hydroxyl radicals, ascorbic acid protected HA from their degradative action. Matrix-assisted laser desorption ionization-time-of-flight (MALDI-TOF) mass spectrometry was applied to analyze the degraded HA. The results showed that only regular fragmentation of hyaluronan occurred using the mentioned oxidative system that led to the formation of HA oligomers with unaffected primary chemical structure.
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Affiliation(s)
- Ladislav Soltés
- Institute of Experimental Pharmacology, Slovak Academy of Sciences, SK-84104 Bratislava, Slovakia.
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