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Lanza V, Vecchio G. New Glycosalen-Manganese(III) Complexes and RCA 120 Hybrid Systems as Superoxide Dismutase/Catalase Mimetics. Biomimetics (Basel) 2023; 8:447. [PMID: 37754198 PMCID: PMC10527547 DOI: 10.3390/biomimetics8050447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 09/17/2023] [Accepted: 09/19/2023] [Indexed: 09/28/2023] Open
Abstract
Reactive oxygen species are implicated in several human diseases, including neurodegenerative disorders, cardiovascular dysfunction, inflammation, hereditary diseases, and ageing. MnIII-salen complexes are superoxide dismutase (SOD) and catalase (CAT) mimetics, which have shown beneficial effects in various models for oxidative stress. These properties make them well-suited as potential therapeutic agents for oxidative stress diseases. Here, we report the synthesis of the novel glycoconjugates of salen complex, EUK-108, with glucose and galactose. We found that the complexes showed a SOD-like activity higher than EUK-108, as well as peroxidase and catalase activities. We also investigated the conjugate activities in the presence of Ricinus communis agglutinin (RCA120) lectin. The hybrid protein-galactose-EUK-108 system showed an increased SOD-like activity similar to the native SOD1.
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Affiliation(s)
- Valeria Lanza
- Istituto di Cristallografia, Consiglio Nazionale delle Ricerche, Via Gaifami 18, 95125 Catania, Italy;
| | - Graziella Vecchio
- Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
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Structural elucidation of a Mn(III) derivative anchored with a tetradentate Schiff base precursor: in vitro cytotoxicity study. CHEMICAL PAPERS 2023. [DOI: 10.1007/s11696-022-02599-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
AbstractA new mononuclear Mn(III) derivative, [Mn(L)(H2O)2]ClO4 (1) was obtained by reacting manganese perchlorate with the tetradentate Schiff base precursor, H2L, [where H2L=C6H3(OMe)(OH)CH=N(CH2)3N=CH(OH)(OMe)C6H3] and characterized by various spectral techniques. Single crystal X-ray diffraction analysis revealed that in 1, the central Mn atom is hexa-coordinated via the NNOO donor sites of the Schiff base precursor and two water molecules, yielding a distorted octahedral geometry. Also, the EPR spectra of 1 were recorded at the solid state by varying the temperature (from 90 to 300 K) as well as in different organic solvents; DMSO, MeOH and a mixture CH2Cl2/toluene; the results obtained agree with the geometrical environment around the metal. The cytotoxic activity of the Mn(III) derivative was evaluated against normal and cancer cell lines. The derivative exhibited comparatively better cytotoxic activity against MCF-7 cells compared to SiHa and fibroblast cells.
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Inertness of Superoxide Dismutase Mimics Mn(II) Complexes Based on an Open-Chain Ligand, Bioactivity, and Detection in Intestinal Epithelial Cells. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:3858122. [PMID: 35401918 PMCID: PMC8993562 DOI: 10.1155/2022/3858122] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 01/03/2022] [Accepted: 01/29/2022] [Indexed: 12/22/2022]
Abstract
Oxidative stress is known to play a major role in the pathogenesis of inflammatory bowel diseases (IBDs), and, in particular, superoxide dismutase (SODs) defenses were shown to be weakened in patients suffering from IBDs. SOD mimics, also called SOD mimetics, as low-molecular-weight complexes reproducing the activity of SOD, constitute promising antioxidant catalytic metallodrugs in the context of IBDs. A Mn(II) complex SOD mimic (Mn1) based on an open-chain diaminoethane ligand exerting antioxidant and anti-inflammatory effects on an intestinal epithelial cellular model was shown to experience metal exchanges between the manganese center and metal ions present in the biological environment (such as Zn(II)) to some degrees. As the resulting complexes (mainly Zn(II)) were shown to be inactive, improving the kinetic inertness of Mn(II) complexes based on open-chain ligands is key to improve their bioactivity in a cellular context. We report here the study of three new Mn(II) complexes resulting from Mn1 functionalization with a cyclohexyl and/or a propyl group meant to limit, respectively, (a) metal exchanges and (b) deprotonation of an amine from the 1,2-diaminoethane central scaffold. The new manganese-based SOD mimics display a higher intrinsic SOD activity and also improved kinetic inertness in metal ion exchange processes (with Zn(II), Cu(II), Ni(II), and Co(II)). They were shown to provide anti-inflammatory and antioxidant effects in cells at lower doses than Mn1 (down to 10 μM). This improvement was due to their higher inertness against metal-assisted dissociation and not to different cellular overall accumulations. Based on its higher inertness, the SOD mimic containing both the propyl and the cyclohexyl moieties was suitable for intracellular detection and quantification by mass spectrometry, quantification, that was achieved by using a 13C-labeled Co-based analog of the SOD mimics as an external heavy standard.
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Evaluation of the compounds commonly known as superoxide dismutase and catalase mimics in cellular models. J Inorg Biochem 2021; 219:111431. [PMID: 33798828 DOI: 10.1016/j.jinorgbio.2021.111431] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 03/15/2021] [Accepted: 03/15/2021] [Indexed: 12/15/2022]
Abstract
Oxidative stress that results from an imbalance between the concentrations of reactive species (RS) and antioxidant defenses is associated with many pathologies. Superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase are among the key enzymes that maintain the low nanomolar physiological concentrations of superoxide and hydrogen peroxide. The increase in the levels of these species and their progeny could have deleterious effects. In this context, chemists have developed SOD and CAT mimics to supplement them when cells are overwhelmed with oxidative stress. However, the beneficial activity of such molecules in cells depends not only on their intrinsic catalytic activities but also on their stability in biological context, their cell penetration and their cellular localization. We have employed cellular assays to characterize several compounds that possess SOD and CAT activities and have been frequently used in cellular and animal models. We used cellular assays that address SOD and CAT activities of the compounds. Finally, we determined the effect of compounds on the suppression of the inflammation in HT29-MD2 cells challenged by lipopolysaccharide. When the assay requires penetration inside cells, the SOD mimics Mn(III) meso-tetrakis(N-(2'-n-butoxyethyl)pyridinium-2-yl)porphyrin (MnTnBuOE-2-PyP5+) and Mn(II) dichloro[(4aR,13aR,17aR,21aR)-1,2,3,4,4a,5,6,12,13,13a,14,15,16,17,17a,18,19,20,21,21a-eicosahydro-11,7-nitrilo-7Hdibenzo[b,h] [1,4, 7,10] tetraazacycloheptadecine-κN5,κN13,κN18,κN21,κN22] (Imisopasem manganese, M40403, CG4419) were found efficacious at 10 μM, while Mn(II) chloro N-(phenolato)-N,N'-bis[2-(N-methyl-imidazolyl)methyl]-ethane-1,2-diamine (Mn1) requires an incubation at 100 μM. This study thus demonstrates that MnTnBuOE-2-PyP5+, M40403 and Mn1 were efficacious in suppressing inflammatory response in HT29-MD2 cells and such action appears to be related to their ability to enter the cells and modulate reactive oxygen species (ROS) levels.
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Shaghaghi Z, Bikas R, Tajdar H, Kozakiewicz A. Iron(III) complexes with N2O2-donor salophen and azide ligands: Crystal structure, experimental and theoretical studies. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128431] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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6
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Patel AK, Jadeja R, Roy H, Patel R, Patel S, Butcher R. Pseudo-tetrahedral copper(II) complex derived from N'-[(2E,3Z)-4-hydroxy-4-phenylbut-3-en-2-ylidene]acetohydrazide: Synthesis, molecular structure, quantum chemical investigations, antioxidant and antiproliferative properties. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.03.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Dauchy M, Ferreira M, Leblond J, Bricout H, Tilloy S, Smith GS, Monflier E. New water-soluble Schiff base ligands based on β-cyclodextrin for aqueous biphasic hydroformylation reaction. PURE APPL CHEM 2018. [DOI: 10.1515/pac-2017-1205] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Abstract
The synthesis of water-soluble rhodium(I) salicylaldiminato and salicylhydrazonic complexes has been achieved employing two preparative routes. Schiff base condensation between 6A-deoxy-6A-amino-β-CD or 6A-deoxy-6A-hydrazino-β-CD and 5-sodiosulfonato-2-hydroxybenzaldehyde (sulfonated salicylaldehyde) (1) or 5-sodiosulfonato-3-tert-butyl-2-hydroxybenzaldehyde (sulfonated
t
Bu-salicylaldehyde) (2) led to the formation of the corresponding imine or hydrazone ligands (3, 4, 5 and 6). Reaction of [Rh(COD)2
+BF4
−] with these new ligands in an alkaline solution formed the corresponding rhodium complexes quantitatively. These rhodium(I) complexes could also be prepared in one-pot by mixing, in stoichiometric proportions, the modified β-CDs with the sulfonated salicylaldehyde and with the rhodium precursor in an alkaline solution at room temperature. These rhodium complexes were applied as catalysts in the aqueous biphasic hydroformylation of 1-decene as a model reaction.
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Affiliation(s)
- Maxime Dauchy
- Univ. Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181, Unité de Catalyse et de Chimie du Solide (UCCS) , F-62300 Lens , France
| | - Michel Ferreira
- Univ. Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181, Unité de Catalyse et de Chimie du Solide (UCCS) , F-62300 Lens , France
| | - Jérôme Leblond
- Univ. Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181, Unité de Catalyse et de Chimie du Solide (UCCS) , F-62300 Lens , France
| | - Hervé Bricout
- Univ. Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181, Unité de Catalyse et de Chimie du Solide (UCCS) , F-62300 Lens , France
| | - Sébastien Tilloy
- Univ. Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181, Unité de Catalyse et de Chimie du Solide (UCCS) , F-62300 Lens , France
| | - Gregory S. Smith
- Department of Chemistry , University of Cape Town, Private Bag X3 , Rondebosch 7701, Cape Town , South Africa
| | - Eric Monflier
- Univ. Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181, Unité de Catalyse et de Chimie du Solide (UCCS) , F-62300 Lens , France
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9
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Erxleben A. Transition metal salen complexes in bioinorganic and medicinal chemistry. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.06.060] [Citation(s) in RCA: 91] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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10
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Patel RN, Singh Y, Singh YP, Patel AK, Patel N, Singh R, Butcher RJ, Jasinski JP, Colacio E, Palacios MA. Varying structural motifs, unusual X-band electron paramagnetic spectra, DFT studies and superoxide dismutase enzymatic activity of copper(ii) complexes with N′-[(E)-phenyl(pyridin-2-yl)methylidene]benzohydrazide. NEW J CHEM 2018. [DOI: 10.1039/c7nj04182a] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A diverse set of new copper(ii) complexes synthesized as possible models for antioxidant superoxide dismutase mimics.
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Affiliation(s)
- Ram N. Patel
- Department of Chemistry
- A.P.S. University
- Rewa
- India
| | | | | | | | - Neetu Patel
- Department of Chemistry
- A.P.S. University
- Rewa
- India
| | - Rita Singh
- Department of Physics
- Govt. Model Science College
- Rewa
- India
| | - Raymond J. Butcher
- Department of Inorganic & Structural Chemistry
- Howard University
- Washington
- USA
| | | | - Enrique Colacio
- Departamento de Quimica Inorganica
- Universidad de Granada
- Granada
- Spain
| | - Maria A. Palacios
- Departamento de Quimica Inorganica
- Universidad de Granada
- Granada
- Spain
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11
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Mathieu E, Bernard AS, Delsuc N, Quévrain E, Gazzah G, Lai B, Chain F, Langella P, Bachelet M, Masliah J, Seksik P, Policar C. A Cell-Penetrant Manganese Superoxide Dismutase (MnSOD) Mimic Is Able To Complement MnSOD and Exerts an Antiinflammatory Effect on Cellular and Animal Models of Inflammatory Bowel Diseases. Inorg Chem 2017; 56:2545-2555. [PMID: 28198622 DOI: 10.1021/acs.inorgchem.6b02695] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Inorganic complexes are increasingly used for biological and medicinal applications, and the question of the cell penetration and distribution of metallodrugs is key to understanding their biological activity. Oxidative stress is known to be involved in inflammation and in inflammatory bowel diseases for which antioxidative defenses are weakened. We report here the study of the manganese complex Mn1 mimicking superoxide dismutase (SOD), a protein involved in cell protection against oxidative stress, using an approach in inorganic cellular chemistry combining the investigation of Mn1 intracellular speciation using mass spectrometry and of its quantification and distribution using electron paramagnetic resonance and spatially resolved X-ray fluorescence with evaluation of its biological activity. More precisely, we have looked for and found the MS signature of Mn1 in cell lysates and quantified the overall manganese content. Intestinal epithelial cells activated by bacterial lipopolysaccharide were taken as a cellular model of oxidative stress and inflammation. DNBS-induced colitis in mice was used to investigate Mn1 activity in vivo. Mn1 exerts an intracellular antiinflammatory activity, remains at least partially coordinated, with diffuse distribution over the whole cell, and functionally complements mitochondrial MnSOD.
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Affiliation(s)
- Emilie Mathieu
- Département de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Univ Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France
| | - Anne-Sophie Bernard
- Département de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Univ Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France
| | - Nicolas Delsuc
- Département de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Univ Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France
| | - Elodie Quévrain
- Département de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Univ Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France
| | - Géraldine Gazzah
- Département de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Univ Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France
| | - Barry Lai
- X-ray Science Division, Argonne National Laboratory (ANL) , Argonne, Illinois 60439, United States
| | - Florian Chain
- Commensal and Probiotics-Host Interactions Laboratory, Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, F-78350 Jouy-en-Josas, France
| | - Philippe Langella
- Commensal and Probiotics-Host Interactions Laboratory, Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, F-78350 Jouy-en-Josas, France
| | - Maria Bachelet
- Sorbonne Universites, UPMC Univ Paris 06 - Département de Chimie, Ecole Normale Superieure, PSL Research University - CNRS, INSERM, APHP, INRA, Laboratoire des Biomolecules (LBM), 27 rue de Chaligny, 75012 Paris, France.,Commensal and Probiotics-Host Interactions Laboratory, Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, F-78350 Jouy-en-Josas, France
| | - Joelle Masliah
- Département de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Univ Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France.,Sorbonne Universites, UPMC Univ Paris 06 - Département de Chimie, Ecole Normale Superieure, PSL Research University - CNRS, INSERM, APHP, INRA, Laboratoire des Biomolecules (LBM), 27 rue de Chaligny, 75012 Paris, France
| | - Philippe Seksik
- Sorbonne Universites, UPMC Univ Paris 06 - Département de Chimie, Ecole Normale Superieure, PSL Research University - CNRS, INSERM, APHP, INRA, Laboratoire des Biomolecules (LBM), 27 rue de Chaligny, 75012 Paris, France.,Commensal and Probiotics-Host Interactions Laboratory, Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, F-78350 Jouy-en-Josas, France
| | - Clotilde Policar
- Département de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Univ Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France
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12
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Singh Y, Patel RN, Singh YP, Patel AK, Patel N, Singh R, Butcher RJ, Jasinski JP, Colacio E, Palacios MA. Unprecedented tetranuclear complexes with “weighing balance shaped” topology: single crystal structures, unusual EPR spectra, magnetic properties and antioxidant activity. Dalton Trans 2017; 46:11860-11874. [DOI: 10.1039/c7dt02595e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Two new copper(ii) complexes have been synthesized and characterized by single crystal X-ray diffraction.
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Affiliation(s)
- Yogendra Singh
- Department of Chemistry
- A.P.S. University
- Rewa (M.P.)
- India
| | - Ram N. Patel
- Department of Chemistry
- A.P.S. University
- Rewa (M.P.)
- India
| | | | - Abhay K. Patel
- Department of Chemistry
- A.P.S. University
- Rewa (M.P.)
- India
| | - Neetu Patel
- Department of Chemistry
- A.P.S. University
- Rewa (M.P.)
- India
| | - Rita Singh
- Department of Physics
- Govt. Model Science college
- Rewa (M.P.)
- India
| | - Raymond J. Butcher
- Department of Inorganic & Structural Chemistry
- Howard University
- Washington DC
- USA
| | | | - Enrique Colacio
- Departamento de QuimicaInorganica
- Universidad de Granada
- Granada
- Spain
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13
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14
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Canabarro CM, Ceolin J, Siqueira JD, Iglesias BA, Manzoni de Oliveira G, Back DF, Campos PT. Evaluation of the Antioxidant Activity of Copper(II) Complexes containing Tris-(hydroxymethyl)aminomethane (TRIS) Units. Z Anorg Allg Chem 2016. [DOI: 10.1002/zaac.201600214] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Cibele M. Canabarro
- Laboratório de Materiais Inorgânicos; Department of Chemistry; Federal University of Santa Maria, UFSM; ZIP CODE 97115-900 Santa Maria, RS Brazil
| | - Joice Ceolin
- Laboratório de Materiais Inorgânicos; Department of Chemistry; Federal University of Santa Maria, UFSM; ZIP CODE 97115-900 Santa Maria, RS Brazil
| | - Josiéli D. Siqueira
- Laboratório de Materiais Inorgânicos; Department of Chemistry; Federal University of Santa Maria, UFSM; ZIP CODE 97115-900 Santa Maria, RS Brazil
| | - Bernardo A. Iglesias
- Laboratório de Materiais Inorgânicos; Department of Chemistry; Federal University of Santa Maria, UFSM; ZIP CODE 97115-900 Santa Maria, RS Brazil
| | - Gelson Manzoni de Oliveira
- Laboratório de Materiais Inorgânicos; Department of Chemistry; Federal University of Santa Maria, UFSM; ZIP CODE 97115-900 Santa Maria, RS Brazil
| | - Davi F. Back
- Laboratório de Materiais Inorgânicos; Department of Chemistry; Federal University of Santa Maria, UFSM; ZIP CODE 97115-900 Santa Maria, RS Brazil
| | - Patrick T. Campos
- Instituto Federal Sul-Rio-Grandense (IFSul); Campus Pelotas, RS Brazil
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Importance of ground state stabilization in the oxovanadium(IV)-salophen mediated reactions of phenylsulfinylacetic acids by hydrogen peroxide – Non-linear Hammett correlation. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.06.038] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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16
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Ebani PR, Fontana LA, Campos PT, Rosso EF, Piquini PC, Iglesias BA, Back DF. New manganese(II) and nickel(II) coordination compounds with N,O-polydentate ligands obtained from pyridoxal and tripodal units. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.05.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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17
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Sabaté F, Gavara R, Giannicchi I, Bosque R, Cort AD, Rodríguez L. Ternary assemblies comprising metal–salophen complexes and 4,4′-bipyridine. NEW J CHEM 2016. [DOI: 10.1039/c5nj03210e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The formation of ternary species containing zinc or uranyl–salophen complexes has been explored and analyzed in this work.
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Affiliation(s)
- Ferran Sabaté
- Departament de Química Inorgànica
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - Raquel Gavara
- Departament de Química Inorgànica
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - Ilaria Giannicchi
- Dipartimento di Chimica and IMC-CNR Sezione Meccanismi di Reazione
- Università La Sapienza
- 00185 Roma
- Italy
| | - Ramon Bosque
- Departament de Química Inorgànica
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - Antonella Dalla Cort
- Dipartimento di Chimica and IMC-CNR Sezione Meccanismi di Reazione
- Università La Sapienza
- 00185 Roma
- Italy
| | - Laura Rodríguez
- Departament de Química Inorgànica
- Universitat de Barcelona
- 08028 Barcelona
- Spain
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18
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Signorella S, Daier V, Ledesma G, Palopoli C, Back DF, Lang ES, Kopp CR, Ebani P, Pereira MB, Giacomelli C, Piquini PC. Synthesis, structure and SOD activity of Mn complexes with symmetric Schiff base ligands derived from pyridoxal. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.09.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Shivakumar L, Shivaprasad K, Revanasiddappa HD. SODs, DNA binding and cleavage studies of new Mn(III) complexes with 2-((3-(benzyloxy)pyridin-2-ylimino)methyl)phenol. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 107:203-12. [PMID: 23429055 DOI: 10.1016/j.saa.2013.01.025] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Revised: 01/08/2013] [Accepted: 01/10/2013] [Indexed: 05/20/2023]
Abstract
Newly synthesized ligand [2-((3-(benzyloxy)pyridin-2-ylimino)methyl)phenol] (Bpmp) react with manganese(II) to form mononuclear complexes [Mn(phen)(Bpmp)(CH3COO)(H2O)]·4H2O (1), (phen=1,10-phenanthroline) and [Mn(Bpmp)2(CH3COO)(H2O)]·5H2O (2). These complexes were characterized by elemental analysis, IR, (1)H NMR, Mass, UV-vis spectral studies. Molar conductance and thermogravimetric analysis of these complexes were also recorded. The in vitro SOD mimic activity of Mn(III) complexes were carried out and obtained with good result. The DNA-binding properties of the complexes 1 and 2 were investigated by UV-spectroscopy, fluorescence spectroscopy and viscosity measurements. The spectral results suggest that the complexes 1 and 2 can bind to Calf thymus DNA by intercalation mode. The cleavage properties of these complexes with super coiled pUC19 have been studied using the gel electrophoresis method, wherein both complexes 1 and 2 displayed chemical nuclease activity in the absence and presence of H2O2 via an oxidative mechanism. All the complexes inhibit the growth of both Gram positive and Gram negative bacteria to competent level. The MIC was determined by microtiter method.
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Affiliation(s)
- L Shivakumar
- Department of Chemistry, University of Mysore, Manasagangotri, Mysore 570 006, Karnataka, India
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Fluoride-Triggered ESPT in the Binding with Sal(oph)en. J Fluoresc 2012; 22:1231-6. [DOI: 10.1007/s10895-012-1063-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Accepted: 05/03/2012] [Indexed: 11/25/2022]
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Dehkordi MN, Bordbar AK, Lincoln P, Mirkhani V. Spectroscopic study on the interaction of ct-DNA with manganese Salen complex containing triphenyl phosphonium groups. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 90:50-54. [PMID: 22306451 DOI: 10.1016/j.saa.2012.01.015] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2011] [Revised: 12/08/2011] [Accepted: 01/08/2012] [Indexed: 05/31/2023]
Abstract
The DNA binding properties of a bulky and hydrophobic Schiff base complex of manganese(III) [N,N'-bis(5-(triphenyl phosphonium methyl)salicylidene)-1,2-ethylene diamine chloride Mn(III) acetate] was examined by spectroscopic techniques. UV-vis titration data indicate both hypo and hyperchromic effect with addition of DNA to complex. A competitive binding study showed that the enhanced emission intensity of ethidium bromide (EB) in the presence of DNA was quenched by adding Mn Salen complex. This finding indicates that Mn Salen complex displaces EB from its binding site in DNA. Helix melting studies indicate improvement in the helix stability, and an increase in the melting temperature. The analysis of CD spectra represents the structural changes in DNA due to the binding of Mn Salen complex. The binding constant has been calculated using absorbance and fluorescence data. The results also represent that the binding process proceeds by strong electrostatic and hydrophobic interactions.
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23
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Pap JS, Kripli B, Váradi T, Giorgi M, Kaizer J, Speier G. Comparison of the SOD-like activity of hexacoordinate Mn(II), Fe(II) and Ni(II) complexes having isoindoline-based ligands. J Inorg Biochem 2011; 105:911-8. [DOI: 10.1016/j.jinorgbio.2011.01.016] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2010] [Revised: 01/11/2011] [Accepted: 01/31/2011] [Indexed: 11/29/2022]
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24
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A new method for the quantification of superoxide dismutase mimics with an allopurinol–xanthine oxidase–lucigenin enhanced system. J Biol Inorg Chem 2011; 16:753-61. [DOI: 10.1007/s00775-011-0777-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2010] [Accepted: 03/24/2011] [Indexed: 10/18/2022]
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25
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Iranzo O. Manganese complexes displaying superoxide dismutase activity: A balance between different factors. Bioorg Chem 2011; 39:73-87. [DOI: 10.1016/j.bioorg.2011.02.001] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2010] [Revised: 02/14/2011] [Accepted: 02/14/2011] [Indexed: 01/05/2023]
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26
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A novel artificial superoxide dismutase: Non-covalent conjugation of albumin with a MnIII salophen type complex. Eur J Med Chem 2011; 46:961-5. [DOI: 10.1016/j.ejmech.2010.12.023] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2010] [Revised: 12/10/2010] [Accepted: 12/21/2010] [Indexed: 12/11/2022]
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27
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Synthesis and kinetic evaluation of a trifunctional enzyme mimic with a dimanganese active centre. J Inorg Biochem 2011; 105:283-8. [DOI: 10.1016/j.jinorgbio.2010.09.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2010] [Revised: 09/08/2010] [Accepted: 09/09/2010] [Indexed: 11/22/2022]
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28
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Oliveri V, Puglisi A, Vecchio G. New conjugates of β-cyclodextrin with manganese(iii) salophen and porphyrin complexes as antioxidant systems. Dalton Trans 2011; 40:2913-9. [DOI: 10.1039/c0dt01480j] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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29
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Deunf E, Zaborova E, Guieu S, Blériot Y, Verpeaux JN, Buriez O, Sollogoub M, Amatore C. Synthesis and Electrochemical Study of an Original Copper(II)-Capped Salen-Cyclodextrin Complex. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.200901208] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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30
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Li R, Huang F, Jiang X, Liu M, Song Y, Liu H, Zhang J. Catalase-like catalytic reaction of the dinuclear manganese–salen complex. J COORD CHEM 2010. [DOI: 10.1080/00958972.2010.483611] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Rong Li
- a Department of Pharmaceutical Sciences , School of Pharmacy, State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology , Shanghai 200237, P.R. China
| | - Fuping Huang
- b Department of Chemistry , Nankai University , Tianjin 300071, P.R. China
| | - Xiaojun Jiang
- a Department of Pharmaceutical Sciences , School of Pharmacy, State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology , Shanghai 200237, P.R. China
| | - Mingyuan Liu
- a Department of Pharmaceutical Sciences , School of Pharmacy, State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology , Shanghai 200237, P.R. China
| | - Yanying Song
- a Department of Pharmaceutical Sciences , School of Pharmacy, State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology , Shanghai 200237, P.R. China
| | - Hui Liu
- a Department of Pharmaceutical Sciences , School of Pharmacy, State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology , Shanghai 200237, P.R. China
| | - Jingyan Zhang
- a Department of Pharmaceutical Sciences , School of Pharmacy, State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology , Shanghai 200237, P.R. China
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31
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Kaczmarek MT, Kubicki M, Mondry A, Janicki R, Radecka-Paryzek W. Self-Assembled Lanthanide Salicylaldimines with a Unique Coordination Mode. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.200901083] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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32
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Montazerozohori M, Fradombe LZ. Aerobic Oxidation of Some Arylthiols Catalyzed by a New Manganese (III) Schiff-Base Complex. PHOSPHORUS SULFUR 2010. [DOI: 10.1080/10426500902839830] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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33
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Dalla Cort A, De Bernardin P, Forte G, Yafteh Mihan F. Metal–salophen-based receptors for anions. Chem Soc Rev 2010; 39:3863-74. [DOI: 10.1039/b926222a] [Citation(s) in RCA: 122] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Eckshtain M, Zilbermann I, Mahammed A, Saltsman I, Okun Z, Maimon E, Cohen H, Meyerstein D, Gross Z. Superoxide dismutase activity of corrole metal complexes. Dalton Trans 2009:7879-82. [PMID: 19771348 DOI: 10.1039/b911278b] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first report regarding SOD activity of metallocorroles, investigated via the combination of the cytochrome C assay, pulse radiolysis, and electrochemistry, is used for identifying the main criteria needed for achieving good performance, as well as for elucidating mechanistic aspects of their action.
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Affiliation(s)
- Meital Eckshtain
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, 32000, Israel
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35
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Self-assembled synthesis, characterization and antimicrobial activity of zinc(II) salicylaldimine complexes. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2009.02.012] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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36
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Bellia F, La Mendola D, Pedone C, Rizzarelli E, Saviano M, Vecchio G. Selectively functionalized cyclodextrins and their metal complexes. Chem Soc Rev 2009; 38:2756-81. [PMID: 19690752 DOI: 10.1039/b718436k] [Citation(s) in RCA: 120] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cyclodextrins (CDs) are cyclic oligomers of alpha-1,4-linked D-glucopyranose. Due to their unique structure, marked by a chiral and hydrophobic cavity, CDs have been extensively used as chiral selectors and drug delivery systems. The functionalization both improve the CD applications and widen their use in many other fields, such as molecular recognition and enzyme mimicking. Moreover, the functionalization highly increases the metal binding properties of the CDs. This critical review is a report of recent applications concerning the CD derivatives and their metal complexes. The metal ion assists the host-guest interaction often increasing the properties of CDs to act as chiral receptors. Furthermore, it can act as a catalytic center in the mimicking of metalloenzymes based on functionalized CDs (164 references).
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Affiliation(s)
- Francesco Bellia
- Dipartimento di Scienze Chimiche, University of Catania, viale A. Doria 6, 95125, Catania, Italy
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37
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MONTAZEROZOHORI M, NASR-ESFAHANI M, AKHLAGHI P. Catalytic Oxidative Decarboxylation of Some Benzylcarboxylic Acid Derivatives by a New Iron(III) Schiff Base Complex. CHINESE J CHEM 2009. [DOI: 10.1002/cjoc.200990143] [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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38
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Lanza V, Vecchio G. New conjugates of superoxide dismutase/catalase mimetics with cyclodestrins. J Inorg Biochem 2009; 103:381-8. [DOI: 10.1016/j.jinorgbio.2008.11.017] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2008] [Revised: 11/21/2008] [Accepted: 11/24/2008] [Indexed: 10/21/2022]
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39
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Kasuno M, Hayano M, Fujiwara M, Matsushita T. Effects of chloride ions on electrochemical reactions of manganese(III) complexes. Polyhedron 2009. [DOI: 10.1016/j.poly.2008.10.073] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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40
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Radecka-Paryzek W. Self-assembly in Schiff base lanthanide complexes — From supramolecular dimers to coordination polymers. CAN J CHEM 2009. [DOI: 10.1139/v08-109] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
A review is given of the latest contribution of the author’s research group to the coordination chemistry of Schiff base polyaza macrocycles and acyclic salicylaldimines. Focus is placed on the effectiveness of lanthanides in supramolecular self-assembly of the components leading to the formation of compounds with unusual properties and structures.Key words: Schiff base macrocycles, salicylaldimines, lanthanides, self-assembly, template synthesis.
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41
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Park W, Lim D. Effect of the oligo(ethylene glycol) group on the antioxidant activity of manganese salen complexes. Bioorg Med Chem Lett 2008; 19:614-7. [PMID: 19124240 DOI: 10.1016/j.bmcl.2008.12.063] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2008] [Revised: 11/15/2008] [Accepted: 12/16/2008] [Indexed: 01/08/2023]
Abstract
The synthesis and antioxidant activity of oligo(ethylene glycol)-modified manganese salen complexes are reported. Their SOD activities were similar and 2- to 3-fold more potent than the standard compound EUK-134. Their catalase-like activity was lower than that of EUK-134 in the initial conversion rate; however, some analogs exhibited a better catalytic turnover number.
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Affiliation(s)
- Wonchoul Park
- Department of Chemistry, Sejong University, Kwang-Jin Ku, Kunja-Dong, 98, Seoul 143-747, Republic of Korea
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42
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Cisnetti F, Lefèvre AS, Guillot R, Lambert F, Blain G, Anxolabéhère-Mallart E, Policar C. A New Pentadentate Ligand Forms Both a Di- and a Mononuclear MnII Complex: Electrochemical, Spectroscopic and Superoxide Dismutase Activity Studies. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200601236] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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43
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Puglisi A, Purrello R, Rizzarelli E, Sortino S, Vecchio G. Spectroscopic and self-association behavior of a porphyrin-β-cyclodextrin conjugate. NEW J CHEM 2007. [DOI: 10.1039/b703680a] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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44
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45
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Wang Y, Gao JQ, Zheng CH, Xu DH, Liang WQ. Biodegradable and complexed microspheres used for sustained delivery and activity protection of SOD. J Biomed Mater Res B Appl Biomater 2006; 79:74-8. [PMID: 16506185 DOI: 10.1002/jbm.b.30513] [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: 11/09/2022]
Abstract
To develop a new protein delivery system for superoxide dismutase (SOD), biodegradable materials like poly(DL-lactide-co-glycolide) (PLGA), alginate, and chitosan were used for preparing PLGA microspheres and alginate-chitosan microspheres, which were used for encapsulating protein. Alginate-chitosan microspheres showed much higher entrapment efficiency (91.08% +/- 1.28%) than that of PLGA microspheres (36.42% +/- 1.81%). In vitro release study showed that SOD presented a sustained release character in the preparation of these biodegradable materials. After 15 days, 43.72% +/- 0.43% of protein was released from alginate-chitosan microspheres, while there was 62.96% +/- 3.95% of protein release from PLGA microspheres. However, alginate-chitosan demonstrated that it was a better material to control the burst release of protein from microspheres. Furthermore, SOD activity in microspheres was evaluated, and the results showed that microspheres protected the activity of protein to some extent. Finally, PLGA-alginate-chitosan complex microspheres were constructed and the release character in vitro demonstrated that this preparation could not only prolong the release of drug but also decrease the burst release.
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Affiliation(s)
- Ye Wang
- Institute of Pharmaceutics, Zhejiang University, Hangzhou 310031, China
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46
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Bermejo MR, Fernández MI, González-Noya AM, Maneiro M, Pedrido R, Rodríguez MJ, García-Monteagudo JC, Donnadieu B. Novel peroxidase mimics: μ-Aqua manganese–Schiff base dimers. J Inorg Biochem 2006; 100:1470-8. [PMID: 16790277 DOI: 10.1016/j.jinorgbio.2006.04.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2005] [Revised: 04/04/2006] [Accepted: 04/06/2006] [Indexed: 11/26/2022]
Abstract
The interaction of manganese(II) carboxylate salts [Mn(O(2)CR)(2), where R=ethane, pentane] with H(2)L(1) [N,N'-bis(3-methoxy-2-hydroxybenzaldehyde)-1,2-phenylenediamine] and H(2)L(2) [N,N'-bis(3-ethoxy-2-hydroxybenzaldehyde)-1,2-phenylenediamine] was studied. MnL(1)(O(2)CEt)(H(2)O) (1), MnL(1)(O(2)CPe(n))(H(2)O) (2), MnL(2)(O(2)CEt)(H(2)O)(2) (3) and MnL(2)(O(2)CPe(n))(H(2)O)(2) (4) were isolated and thoroughly characterised by elemental analysis, FAB mass spectrometry, infrared and (1)H NMR spectroscopy, magnetic susceptibility measurements, molar conductivities, and cyclic and normal pulse voltammetry. Compounds 1 and 2 were crystallographically characterised revealing a tetragonally elongated octahedral geometry for the manganese coordination sphere and also a dimeric nature through mu-aqua bridges. Complexes 1-4 behave as efficient peroxidase mimics in the presence of the water-soluble trap ABTS, probably due to their ease to coordinate the substrate molecule. A correlation between rhombicity of the complexes and peroxidase activity has also been established.
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Affiliation(s)
- Manuel R Bermejo
- Departamento de Química Inorgánica, Facultade de Química, Universidade de Santiago de Compostela, Avda. das Ciencias, s/n, Santiago de Compostela, Galicia E-15782, Spain.
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47
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Bahramian B, Mirkhani V, Tangestaninejad S, Moghadam M. Catalytic epoxidation of olefins and hydroxylation of alkanes with sodium periodate by water-soluble manganese(III)salen. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcata.2005.07.044] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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48
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Cucinotta V, Giuffrida A, Maccarrone G, Messina M, Puglisi A, Rizzarelli E, Vecchio G. Coordination properties of 3-functionalized β-cyclodextrins. Thermodynamic stereoselectivity of copper(ii) complexes of the A,B-diamino derivative and its exploitation in LECE. Dalton Trans 2005:2731-6. [PMID: 16075113 DOI: 10.1039/b506080j] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The bis-amino AB derivative of beta-cyclodextrin on the secondary rim was synthesised and spectroscopically characterised by different techniques. Its binary systems both with protons and copper(II) were thermodynamically characterised by pH-metric potentiometry. In addition the ternary systems with each of the enantiomers of tryptophan and alanine were investigated. A thermodynamic stereoselectivity was observed for the tryptophan enantiomers and this was exploited to separate them by capillary electrophoresis through a ligand exchange mechanism (LECE). LECE separation of racemates of phenylalanine and tyrosine was also obtained.
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Affiliation(s)
- Vincenzo Cucinotta
- Department of Chemical Sciences, University of Catania, viale A. Doria 6, 95125, Catania, Italy
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