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Mészáros JP, Kovács H, Spengler G, Kovács F, Frank É, Enyedy ÉA. A comparative study on the metal complexes of an anticancer estradiol-hydroxamate conjugate and salicylhydroxamic acid. J Inorg Biochem 2023; 244:112223. [PMID: 37084580 DOI: 10.1016/j.jinorgbio.2023.112223] [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: 03/02/2023] [Revised: 04/03/2023] [Accepted: 04/10/2023] [Indexed: 04/23/2023]
Abstract
Hydroxamic acids bearing an (O,O) donor set are well-known metal-chelating compounds with diverse biological activities including anticancer activity. Since steroid conjugation with a pharmacophoric moiety may have the potential to improve this effect, a salicylhydroxamic acid-estradiol hybrid molecule (E2HA) was synthesized. Only minimal effect of the conjugation on the proton dissociation constants was observed in comparison to salicylhydroxamic acid (SHA). The complexation with essential metal ions (iron, copper) was characterized, since E2HA may exert its cytotoxicity through the binding of these ions in cells. UV-visible spectrophotometric and pH-potentiometric titrations revealed the formation of high-stability complexes, while the Fe(III) preference over Fe(II) was proved by cyclic voltammetry and spectroelectrochemical measurements. Complex formation with half-sandwich Rh(III)(η5-Cp*) and Ru(II)(η6-p-cymene) organometallic cations was also studied as it may improve the anticancer effect and the pharmacokinetic profile of the ligand. At equimolar concentration the speciation is complicated because of the presence of mononuclear and binuclear complexes. The complexes readily react with small molecules e.g. glutathione, 1-methylimidazole and nucleosides, having major effect on solution speciation, namely mixed-ligand complex formation and ligand displacement occur. These processes serve as models for the interactions with biomolecules in the body. E2HA exerted moderate anticancer activity (IC50 = 25-59 μM) in the tested three human cancer cell lines (Colo205, Colo320 and MCF-7), while being non-toxic on non-cancerous MRC-5 cells. Meanwhile, SHA was inactive in the same cells. Complexation with half-sandwich Rh(III) and Ru(II) cations had only a minor improvement on the cytotoxic effect of E2HA.
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Affiliation(s)
- János P Mészáros
- MTA-SZTE Lendület Functional Metal Complexes Research Group, Department of Inorganic and Analytical Chemistry, Interdisciplinary Excellence Centre, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary
| | - Hilda Kovács
- MTA-SZTE Lendület Functional Metal Complexes Research Group, Department of Inorganic and Analytical Chemistry, Interdisciplinary Excellence Centre, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary
| | - Gabriella Spengler
- MTA-SZTE Lendület Functional Metal Complexes Research Group, Department of Inorganic and Analytical Chemistry, Interdisciplinary Excellence Centre, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary; Department of Medical Microbiology, Albert Szent-Györgyi Health Center and Albert Szent-Györgyi Medical School, University of Szeged, Semmelweis u. 6, H-6725 Szeged, Hungary
| | - Ferenc Kovács
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
| | - Éva Frank
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
| | - Éva A Enyedy
- MTA-SZTE Lendület Functional Metal Complexes Research Group, Department of Inorganic and Analytical Chemistry, Interdisciplinary Excellence Centre, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary.
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Udvardy A, Joó F, Kathó Á. Synthesis and catalytic applications of Ru(II)-phosphaurotropine complexes with the use of simple water-soluble Ru(II)-precursors. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.213871] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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3
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Bazemore JG, Padgett CW, Quillian B. Preparation of a dicationic, p-cymene ruthenium(II) dimer, [( p-cymene)Ru(µ-Cl)(P{OCH 2} 3CEt)] 22+: structure, characterization and reactivity. J COORD CHEM 2021. [DOI: 10.1080/00958972.2021.1880005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Joseph G. Bazemore
- Department of Chemistry and Biochemistry, Georgia Southern University, Savannah, GA, USA
| | - Clifford W. Padgett
- Department of Chemistry and Biochemistry, Georgia Southern University, Savannah, GA, USA
| | - Brandon Quillian
- Department of Chemistry and Biochemistry, Georgia Southern University, Savannah, GA, USA
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Nagy I, Farkas E, Kasparkova J, Kostrhunova H, Brabec V, Buglyó P. Synthesis and characterization of (Ru(II), Co(III)) heterobimetallic complexes formed with a 1,10-phenanthroline based hydroxamic acid conjugate. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121265] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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5
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Dömötör O, Enyedy ÉA. Binding mechanisms of half-sandwich Rh(III) and Ru(II) arene complexes on human serum albumin: a comparative study. J Biol Inorg Chem 2019; 24:703-719. [PMID: 31300922 PMCID: PMC6682546 DOI: 10.1007/s00775-019-01683-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Accepted: 06/27/2019] [Indexed: 02/05/2023]
Abstract
Abstract Various half-sandwich ruthenium(II) arene complexes and rhodium(III) arene complexes have been intensively investigated due to their prominent anticancer activity. The interaction of the organometallic complexes of Ru(η6-p-cymene) and Rh(η5-C5Me5) with human serum albumin (HSA) was studied in detail by a combination of various methods such as ultrafiltration, capillary electrophoresis, 1H NMR spectroscopy, fluorometry and UV–visible spectrophotometry in the presence of 100 mM chloride ions. Binding characteristics of the organometallic ions and their complexes with deferiprone, 2-picolinic acid, maltol, 6-methyl-2-picolinic acid and 2-quinaldic acid were evaluated. Kinetic aspects and reversibility of the albumin binding are also discussed. The effect of low-molecular-mass blood components on the protein binding was studied in addition to the interaction of organorhodium complexes with cell culture medium components. The organometallic ions were found to bind to HSA to a high extent via a coordination bond. Release of the bound metal ions was kinetically hindered and could not be induced by the denaturation of the protein. Binding of the Ru(η6-p-cymene) triaqua cation was much slower (ca. 24 h) compared to the rhodium congener (few min), while their complexes interacted with the protein relatively fast (1–2 h). The studied complexes were bound to HSA coordinatively. The highly stable and kinetically inert 2-picolinate Ru(η6-p-cymene) complex bound in an associative manner preserving its original entity, while lower stability complexes decomposed partly or completely upon binding to HSA. Fast, non-specific and high-affinity binding of the complexes on HSA highlights their coordinative interaction with various types of proteins possibly decreasing effective drug concentration. Graphic abstract ![]()
Electronic supplementary material The online version of this article (10.1007/s00775-019-01683-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Orsolya Dömötör
- Department of Inorganic and Analytical Chemistry, Interdisciplinary Excellence Centre, University of Szeged, Dóm tér 7, 6720, Szeged, Hungary.
| | - Éva A Enyedy
- Department of Inorganic and Analytical Chemistry, Interdisciplinary Excellence Centre, University of Szeged, Dóm tér 7, 6720, Szeged, Hungary.
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Deacon-Price C, Romano D, Riedel T, Dyson PJ, Blom B. Synthesis, characterisation and cytotoxicity studies of ruthenium arene complexes bearing trichlorogermyl ligands. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.09.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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7
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Ozsváth A, Farkas E, Diószegi R, Buglyó P. Versatility and trends in the interaction between Pd(ii) and peptide hydroxamic acids. NEW J CHEM 2019. [DOI: 10.1039/c9nj00296k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interaction between di- and tripeptide hydroxamic acids and Pd(ii) (as a Pt(ii) model but with faster ligand exchange reactions) was studied in aqueous solution in the presence of chloride ions by pH-potentiometric and NMR methods revealing ligand-dependent competition between the coordinative and hydrolytic processes.
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Affiliation(s)
- András Ozsváth
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- H-4032 Debrecen, Egyetem tér 1
- Hungary
| | - Etelka Farkas
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- H-4032 Debrecen, Egyetem tér 1
- Hungary
| | - Róbert Diószegi
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- H-4032 Debrecen, Egyetem tér 1
- Hungary
| | - Péter Buglyó
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- H-4032 Debrecen, Egyetem tér 1
- Hungary
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Mészáros JP, Dömötör O, Hackl CM, Roller A, Keppler BK, Kandioller W, Enyedy ÉA. Structural and solution equilibrium studies on half-sandwich organorhodium complexes of (N,N) donor bidentate ligands. NEW J CHEM 2018. [DOI: 10.1039/c8nj01681j] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Characterization, solution stability, chloride affinity and crystal structures of [Rh(η5-C5Me5)(N^N)(H2O)]2+ complexes and their correlation analysis.
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Affiliation(s)
- János P. Mészáros
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
| | - Orsolya Dömötör
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
| | - Carmen M. Hackl
- Institute of Inorganic Chemistry
- Faculty of Chemistry
- University of Vienna
- A-1090 Vienna
- Austria
| | - Alexander Roller
- Institute of Inorganic Chemistry
- Faculty of Chemistry
- University of Vienna
- A-1090 Vienna
- Austria
| | - Bernhard K. Keppler
- Institute of Inorganic Chemistry
- Faculty of Chemistry
- University of Vienna
- A-1090 Vienna
- Austria
| | - Wolfgang Kandioller
- Institute of Inorganic Chemistry
- Faculty of Chemistry
- University of Vienna
- A-1090 Vienna
- Austria
| | - Éva A. Enyedy
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
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Parajdi-Losonczi PL, Buglyó P, Skakalova H, Kasparkova J, Lihi N, Farkas E. Half-sandwich type rhodium(iii)–aminohydroxamate complexes: the role of the position of the amino group in metal ion binding. NEW J CHEM 2018. [DOI: 10.1039/c7nj04711h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Relative order of the pH-dependent conditional stability of the hydroxamate type (O,O) and (Namino,Nhydroxamato) chelates determines the coordination modes in the various mono- and dinuclear complexes of [(η5-Cp*)RhIII(H2O)3]2+ with α-, β- and γ-aminohydroxamic acids.
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Affiliation(s)
| | - Péter Buglyó
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- H-4032 Debrecen
- Hungary
| | - Hana Skakalova
- Department of Biophysics
- Faculty of Science
- Palacky University
- 77146 Olomouc
- Czech Republic
| | - Jana Kasparkova
- Department of Biophysics
- Faculty of Science
- Palacky University
- 77146 Olomouc
- Czech Republic
| | - Norbert Lihi
- MTA-DE Redox and Homogeneous Catalytic Reaction Mechanisms Research Group
- University of Debrecen
- H-4032 Debrecen
- Hungary
| | - Etelka Farkas
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- H-4032 Debrecen
- Hungary
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10
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Synthesis of polymeric bismuth chlorido hydroxamato complexes; X-ray crystal structure and antibacterial activity of a novel Bi(III) salicylhydroxamato complex. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2016.09.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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11
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Dömötör O, Pape VFS, May NV, Szakács G, Enyedy ÉA. Comparative solution equilibrium studies of antitumor ruthenium(η6-p-cymene) and rhodium(η5-C5Me5) complexes of 8-hydroxyquinolines. Dalton Trans 2017; 46:4382-4396. [DOI: 10.1039/c7dt00439g] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Solution stability, chloride ion affinity and multidrug resistance selectivity of half-sandwich Rh(η5-C5Me5) and Ru(η6-p-cymene) complexes of 8-hydroxyquinolines.
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Affiliation(s)
- Orsolya Dömötör
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
- MTA-SZTE Bioinorganic Chemistry Research Group
| | - Veronika F. S. Pape
- Institute of Enzymology
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- H-1117 Budapest
- Hungary
| | - Nóra V. May
- Research Centre for Natural Sciences Hungarian Academy of Sciences
- H-1117 Budapest
- Hungary
| | - Gergely Szakács
- Institute of Enzymology
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- H-1117 Budapest
- Hungary
| | - Éva A. Enyedy
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
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Seršen S, Šket P, Plavec J, Turel I. Interactions of two cytotoxic organoruthenium(II) complexes with G-quadruplex. J Inorg Biochem 2016; 160:70-7. [DOI: 10.1016/j.jinorgbio.2015.11.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 10/06/2015] [Accepted: 11/10/2015] [Indexed: 01/05/2023]
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13
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[(η(6)-p-cymene)Ru(H2O)3](2+) binding capability of aminohydroxamates - A solution and solid state study. J Inorg Biochem 2016; 160:236-45. [PMID: 26971623 DOI: 10.1016/j.jinorgbio.2016.02.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Revised: 02/11/2016] [Accepted: 02/25/2016] [Indexed: 01/06/2023]
Abstract
Complex forming capabilities of [(η(6)-p-cymene)Ru(H2O)3](2+) with aminohydroxamates (2-amino-N-hydroxyacetamide (α-alahaH), 3-amino-N-hydroxypropanamide (β-alahaH) and 4-amino-N-hydroxybutanamide (γ-abhaH)) having the primary amino group in different chelatable position to the hydroxamic function were studied by pH-potentiometry, NMR and MS methods. Formation of stable [O,O] and mixed [O,O][N,N] chelated mono- and dinuclear species is detected in partially slow with α-alahaH and β-alahaH or in fast processes with γ-abhaH and the formation constants of the complexes present in aqueous solution are reported. Synthesis, spectral (NMR, IR) and ESI mass spectrometric characterization of novel dinuclear α-alaninehydroximato complexes containing the half-sandwich type Ru(II) core is described. The crystal and molecular structure of [{(η(6)-p-cymene)Ru}2(μ(2)-α-alahaH-1)(H2O)Br]Br∙H2O (1) and [{(η(6)-p-cymene)Ru}2(μ(2)-α-alahaH-1)(H2O)Cl]BF4∙H2O (2) was determined by single crystal X-ray diffraction method. In the complexes one half-sandwich core is coordinated by a hydroxamate [O,O] chelate while the other one by [Namino,Nhydroxamate] fashion of the bridging ligand. In both cases the remaining coordination sites of one of the Ru cores are taken by a halide ion whiles the other one by a water molecule. Reaction of 2 with 9-methylguanine indicates the N7 coordination of this simple DNA model. Complexes 1 and 2 were tested for their in vitro cytotoxicity using human-derived cancer cell lines (A2780, MCF-7, SKOV-3, HCT-116, HeLa) and showed no anti-proliferative activity in the micromolar concentration range.
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Tirfoin R, Chamoreau LM, Li Y, Fleury B, Lisnard L, Journaux Y. Synthesis, structure and magnetic properties of phenylhydroxamate-based coordination clusters. Dalton Trans 2014; 43:16805-17. [PMID: 25287754 DOI: 10.1039/c4dt02405b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The strategic recombination of preformed coordination clusters in the presence of polymodal bridging ligands has successfully led to the characterisation of five new compounds of structural and magnetic interest. Indeed using the dinuclear complex [M2(H2O)(piv)4(Hpiv)4] (M = Co, Ni; Hpiv = pivalic acid) as starting material and reacting it with phenylhydroxamic acid (H2pha) has yielded the four tetrametallic coordination clusters [Co4(Hpha)2(piv)6(Hpiv)4] (1), [Ni4(Hpha)2(piv)6(Hpiv)2(DMF)2] (2), [Co4(Hpha)2(piv)6(EtOH)2(H2O)2] (3), [Ni4(Hpha)2(piv)6(EtOH)2(H2O)2] (4) and the hexanuclear complex [Co6(Hpha)4(piv)8(EtOH)2]·EtOH (5). All the compounds have been structurally characterised revealing a particular binding mode for the hydroxamate ligand. The study of their magnetic properties has been performed and the modelling of these properties has been done using the appropriate hamiltonians for each compound. The experimental data and their modelling show non-zero spin ground states for compounds 4 and 5.
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Affiliation(s)
- Rémi Tirfoin
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8232, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France.
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Hüse D, Bíró L, Patalenszki J, Bényei AC, Buglyó P. Complex Formation between [(η6-p-cymene)Ru(H2O)3]2+and Hydroxycarboxylates or their Sulfur Analogues - The Role of Thiolate Groups in Metal Ion Binding. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402559] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Sija É, Hartinger CG, Keppler BK, Kiss T, Enyedy ÉA. Solution equilibrium studies of anticancer ruthenium(II)-η6-p-cymene complexes of pyridinecarboxylic acids. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.08.057] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Bíró L, Balogh E, Buglyó P. Interaction between [Ru(η6-p-cym)(H2O)3]2+ and dl-serine or dl-isoserine: The role of the side chain alcoholic OH group in metal ion binding. J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2012.11.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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18
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Enyedy ÉA, Bognár GM, Kiss T, Hanif M, Hartinger CG. Solution equilibrium studies on anticancer ruthenium(II)–η6-p-cymene complexes of 3-hydroxy-2(1H)-pyridones. J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2012.10.042] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Solution equilibria of anticancer ruthenium(II)-(η(6)-p-cymene)-hydroxy(thio)pyr(id)one complexes: impact of sulfur vs. oxygen donor systems on the speciation and bioactivity. J Inorg Biochem 2013; 127:161-8. [PMID: 23721887 DOI: 10.1016/j.jinorgbio.2013.05.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Revised: 03/01/2013] [Accepted: 05/01/2013] [Indexed: 11/23/2022]
Abstract
Stoichiometry and stability of antitumor ruthenium(II)-η(6)-p-cymene complexes of bidentate (O,O) hydroxypyrone and (O,S) hydroxythiopyr(id)one type ligands were determined by pH-potentiometry, (1)H NMR spectroscopy and UV-Vis spectrophotometry in aqueous solution and in dependence of chloride ion concentration. Formation of mono-ligand complexes with moderate stability was found in the case of the hydroxypyrone ligands (ethyl maltol and allomaltol) predominating at the physiological pH range. These complexes decompose to the dinuclear tri-hydroxido bridged species [{Ru(II)(η(6)-p-cymene)}2(OH)3](+) and to the metal-free ligand at basic pH values. In addition, formation of a hydroxido [Ru(II)(η(6)-p-cymene)(L)(OH)] species was found. The hydroxythiopyr(id)one ligands (thiomaltol, thioallomaltol, 3-hydroxy-1,2-dimethyl-thiopyridone) form complexes of significantly higher stability compared with the hydroxypyrones; their complexes are biologically more active, the simultaneous bi- and monodentate coordination of the ligands in the bis complexes (ML2 and ML2H) was also demonstrated. In the case of thiomaltol, formation of tris complexes is also likely at high pH. The replacement of the chlorido by the aqua ligand in the [Ru(II)(η(6)-p-cymene)(L)(Cl)] species was monitored, which is an important activation step in the course of the mode of action of the complexes, facilitating binding to biological targets.
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Bíró L, Godó AJ, Bihari Z, Garribba E, Buglyó P. Tuning the Hydrolytic Properties of Half-Sandwich-Type Organometallic Cations in Aqueous Solution. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201201527] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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21
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Synthesis, characterization, electrochemical behavior and in vitro protein tyrosine kinase inhibitory activity of the cymene-halogenobenzohydroxamato [Ru(η6-cymene)(bha)Cl] complexes. J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2012.12.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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22
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Kurzwernhart A, Kandioller W, Enyedy ÉA, Novak M, Jakupec MA, Keppler BK, Hartinger CG. 3-Hydroxyflavones vs. 3-hydroxyquinolinones: structure–activity relationships and stability studies on RuII(arene) anticancer complexes with biologically active ligands. Dalton Trans 2013; 42:6193-202. [DOI: 10.1039/c2dt32206d] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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23
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Bíró L, Hüse D, Bényei AC, Buglyó P. Interaction of [Ru(η6-p-cym)(H2O)3]2+ with citrate and tricarballate ions in aqueous solution; X-ray crystal structure of novel half-sandwich Ru(II)-citrato complexes. J Inorg Biochem 2012; 116:116-25. [DOI: 10.1016/j.jinorgbio.2012.07.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2012] [Revised: 07/23/2012] [Accepted: 07/31/2012] [Indexed: 10/28/2022]
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24
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Coniglio A, Bassetti M, García‐Garrido SE, Gimeno J. Dimerization of Terminal Arylalkynes in Aqueous Medium by Ruthenium and Acid Promoted (RAP) Catalysis: Acetate‐ Assisted (
sp
)C(
sp
2
)C Bond Formation. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201100600] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Alessandra Coniglio
- Istituto CNR di Metodologie Chimiche, Sezione Meccanismi di Reazione, and Dipartimento di Chimica, Università “La Sapienza”, P. le Aldo Moro 5, I‐00185 Roma, Italy, Fax: (+39)‐06‐490‐421; phone: (+39)‐06‐499‐13769
| | - Mauro Bassetti
- Istituto CNR di Metodologie Chimiche, Sezione Meccanismi di Reazione, and Dipartimento di Chimica, Università “La Sapienza”, P. le Aldo Moro 5, I‐00185 Roma, Italy, Fax: (+39)‐06‐490‐421; phone: (+39)‐06‐499‐13769
| | - Sergio E. García‐Garrido
- Departamento de Química Orgánica e Inorgánica, Instituto de Química Organometálica “Enrique Moles” (Unidad Asociada al C.S.I.C.), Universidad de Oviedo, C/Julían Clavería 8, E‐33071 Oviedo, Principado de Asturias, Spain, Fax: (+34)‐985‐103‐446; phone: (+34)‐985‐103‐461
| | - José Gimeno
- Departamento de Química Orgánica e Inorgánica, Instituto de Química Organometálica “Enrique Moles” (Unidad Asociada al C.S.I.C.), Universidad de Oviedo, C/Julían Clavería 8, E‐33071 Oviedo, Principado de Asturias, Spain, Fax: (+34)‐985‐103‐446; phone: (+34)‐985‐103‐461
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Godó AJ, Bényei AC, Duff B, Egan DA, Buglyó P. Synthesis and X-ray diffraction structures of novel half-sandwich Os(ii)-and Ru(ii)-hydroxamate complexes. RSC Adv 2012. [DOI: 10.1039/c1ra00998b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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Synthesis and solution behaviour of stable mono-, di- and trinuclear Pd(II) complexes of 2,5-pyridinedihydroxamic acid: X-ray crystal structure of a novel Pd(II) hydroxamato complex. Inorganica Chim Acta 2012. [DOI: 10.1016/j.ica.2011.09.050] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Bíró L, Farkas E, Buglyó P. Hydrolytic behaviour and chloride ion binding capability of [Ru(η6-p-cym)(H2O)3]2+: a solution equilibrium study. Dalton Trans 2011; 41:285-91. [PMID: 22051630 DOI: 10.1039/c1dt11405k] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydrolysis of an organometallic cation, [Ru(η(6)-p-cym)(H(2)O)(3)](2+) (p-cym = 1-isopropyl-4-methylbenzene), in the presence of 0.20 M KNO(3) or KCl as supporting electrolyte was studied in detail with the combined use of pH-potentiometry, (1)H-NMR, UV-VIS and ESI-TOF-MS. Stoichiometry and stability constants of chlorido, hydroxido and mixed chlorido-hydroxido complexes formed in aqueous solution have been determined. At pH < 4.0 where hydrolysis of [Ru(η(6)-p-cym)(H(2)O)(3)](2+) is negligible with increasing chloride ion concentration two chlorido complexes, [Ru(η(6)-p-cym)(H(2)O)(2)Cl](+) and [{Ru(η(6)-p-cym)}(2)(μ(2)-Cl)(3)](+), are detectable. At pH > 5.0, in chloride ion free samples the exclusive formation of [{Ru(η(6)-p-cym)}(2)(μ(2)-OH)(3)](+) is found. However, if chloride ion is present (in the range 0-3.50 M) novel mixed chlorido-hydroxido species, [{Ru(η(6)-p-cym)}(2)(μ(2)-OH)(2)(μ(2)-Cl)](+) and [{Ru(η(6)-p-cym)}(2)(μ(2)-OH)(μ(2)-Cl)(2)](+) can also be identified at pH > 4.0. The results obtained in this study may help in rationalizing the solution behaviour of half-sandwich [Ru(η(6)-p-cym)(XY)Z] type complexes which, after dissociation of both the monodentate Z and the chelating XY, are capable of yielding the free aqua species [Ru(η(6)-p-cym)(H(2)O)(3)](2+). Our results demonstrate that different chloride ion concentrations can influence the speciation in the acidic pH range but at biologically relevant conditions (pH = 7.4, c(Cl(-)) = 0.16 M) and at c(M) = 1 μM [{Ru(η(6)-p-cym)}(2)(μ(2)-OH)(3)](+) is predominant in the absence of any coordinating ligands.
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Affiliation(s)
- Linda Bíró
- Department of Inorganic and Analytical Chemistry, University of Debrecen, H-4010, Debrecen, Hungary
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Griffith DM, Szőcs B, Keogh T, Suponitsky KY, Farkas E, Buglyó P, Marmion CJ. Suberoylanilide hydroxamic acid, a potent histone deacetylase inhibitor; its X-ray crystal structure and solid state and solution studies of its Zn(II), Ni(II), Cu(II) and Fe(III) complexes. J Inorg Biochem 2011; 105:763-9. [DOI: 10.1016/j.jinorgbio.2011.03.003] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2010] [Revised: 03/09/2011] [Accepted: 03/10/2011] [Indexed: 01/24/2023]
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Bíró L, Farkas E, Buglyó P. Complex formation between Ru(η(6)-p-cym)(H2O)3]2+ and (O,O) donor ligands with biological relevance in aqueous solution. Dalton Trans 2010; 39:10272-8. [PMID: 20922244 DOI: 10.1039/c0dt00469c] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interaction between [Ru(η(6)-p-cym)(H(2)O)(3)](2+) and (O,O) type chelators with different basicity of the donor atoms was studied using combined pH-potentiometric, (1)H-NMR and ESI-TOF-MS techniques. The studied nine ligands are building blocks of reported complexes with antitumor activity or may model (O,O) donor serum components capable of interacting with the administered half-sandwich ruthenium(II) type drug. Composition and stability constants of the [Ru(η(6)-p-cym)(O,O)Y] type species (Y: H(2)O or OH(-)) were determined (T = 25.0 °C; I = 0.20 M (KCl)) and the metal ion binding strengths of the ligands are discussed. It was found that ligands with two low basicity O donors (oxalic and cyclobutane-1,1-dicarboxylic acid) bind the metal ion at acidic conditions but are not able to prevent the hydrolysis at physiologically relevant conditions. Ligands with one low and one high basicity O donor (lactic and salicylic acid) are weak binders for Ru(η(6)-p-cym)(H(2)O)(3)](2+). Pyrone or pyridinone based ligands are capable of binding the metal ion over a wide pH range and no hydrolysis product is detectable at pH = 7.4. The obtained speciation models may help in the rationalization of the biological activity of such complexes and provide a deeper insight into the solution behaviour of half-sandwich Ru(II) complexes with potential anticancer activity.
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Affiliation(s)
- Linda Bíró
- Department of Inorganic and Analytical Chemistry, University of Debrecen, H-4010, Debrecen, Hungary
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