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Abstract
Nuclear medicine is composed of two complementary areas, imaging and therapy. Positron emission tomography (PET) and single-photon imaging, including single-photon emission computed tomography (SPECT), comprise the imaging component of nuclear medicine. These areas are distinct in that they exploit different nuclear decay processes and also different imaging technologies. In PET, images are created from the 511 keV photons produced when the positron emitted by a radionuclide encounters an electron and is annihilated. In contrast, in single-photon imaging, images are created from the γ rays (and occasionally X-rays) directly emitted by the nucleus. Therapeutic nuclear medicine uses particulate radiation such as Auger or conversion electrons or β- or α particles. All three of these technologies are linked by the requirement that the radionuclide must be attached to a suitable vector that can deliver it to its target. It is imperative that the radionuclide remain attached to the vector before it is delivered to its target as well as after it reaches its target or else the resulting image (or therapeutic outcome) will not reflect the biological process of interest. Radiochemistry is at the core of this process, and radiometals offer radiopharmaceutical chemists a tremendous range of options with which to accomplish these goals. They also offer a wide range of options in terms of radionuclide half-lives and emission properties, providing the ability to carefully match the decay properties with the desired outcome. This Review provides an overview of some of the ways this can be accomplished as well as several historical examples of some of the limitations of earlier metalloradiopharmaceuticals and the ways that new technologies, primarily related to radionuclide production, have provided solutions to these problems.
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Affiliation(s)
- Eszter Boros
- Department of Chemistry , Stony Brook University , Stony Brook , New York 11794 , United States
| | - Alan B Packard
- Division of Nuclear Medicine and Molecular Imaging, Department of Radiology , Boston Children's Hospital , Boston , Massachusetts 02115 , United States.,Harvard Medical School , Boston , Massachusetts 02115 , United States
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Eberle RP, Hari Y, Schürch S. Specific Interactions of Antitumor Metallocenes with Deoxydinucleoside Monophosphates. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2017; 28:1901-1909. [PMID: 28500584 DOI: 10.1007/s13361-017-1697-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 04/13/2017] [Accepted: 04/24/2017] [Indexed: 06/07/2023]
Abstract
Bent metallocenes Cp2MCl2 (M = Ti, V, Nb, Mo) are known to exhibit cytotoxic activity against a variety of cancer types. Though the mechanism of action is not fully understood yet, the accumulation of the metal ions in the nucleus points towards DNA as one of the primary targets. A set of eight deoxydinucleoside monophosphates was used to study the adduct yields with metallocenes and cisplatin. The binding affinities are reflected by the relative intensities of the adducts and were found to follow the order of Pt > V > Ti > Mo (no adducts were detected with Nb). High-resolution tandem mass spectrometry was applied to locate the binding patterns in the deoxydinucleoside monophosphates. Whereas cisplatin binds to the soft nitrogen atoms in the purine nucleobases, the metallocenes additionally interact with the hard phosphate oxygen, which is in good agreement with the hard and soft (Lewis) acids and bases (HSAB) concept. However, the binding specificities were found to be unique for each metallocene. The hard Lewis acids titanium and vanadium predominantly bind to the deprotonated phosphate oxygen, whereas molybdenum, an intermediate Lewis acid, preferentially interacts with the nucleobases. Nucleobases comprise alternative binding sites for titanium and vanadium, presumably oxygen atoms for the first and nitrogen atoms for the latter. In summary, the intrinsic binding behavior of the different metallodrugs is reflected by the gas-phase dissociation of the adducts. Consequently, MS/MS can provide insights into therapeutically relevant interactions between metallodrugs and their cellular targets. Graphical Abstract ᅟ.
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Affiliation(s)
- Rahel P Eberle
- Department of Chemistry and Biochemistry, University of Bern, Bern, Switzerland
| | - Yvonne Hari
- Department of Chemistry and Biochemistry, University of Bern, Bern, Switzerland
| | - Stefan Schürch
- Department of Chemistry and Biochemistry, University of Bern, Bern, Switzerland.
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Bortoluzzi M, Bresciani G, Marchetti F, Pampaloni G, Zacchini S. MoCl5 as an effective chlorinating agent towards α-amino acids: synthesis of α-ammonium-acylchloride salts and α-amino-acylchloride complexes. Dalton Trans 2015; 44:10030-7. [PMID: 25948387 DOI: 10.1039/c5dt01002k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The reactivity of MoCl5 with α-amino acids was investigated for the first time by choosing CH2Cl2 as the reaction medium. The interaction of MoCl5 with l-proline proceeded with Cl/O interchange and led to the formation of [NH2(CH2)3CHC(O)Cl][MoOCl4], 1, in 63% yield. The reactions of MoCl5 with l-phenylalanine, sarcosine, N,N-dimethylglycine and N,N-dimethyl-l-phenylalanine afforded the α-amino-acylchloride complexes MoOCl3[O[double bond, length as m-dash]C(Cl)CH(R)N(R')(R'')] (R = CH2Ph, R' = R'' = H, 2a; R = R' = H, R'' = Me, 2b; R = H, R' = R'' = Me, 2c R = CH2Ph, R' = R'' = Me, 2d), in ca. 70% yields. According to DFT studies, 2a,d are mononuclear Mo(v) octahedral complexes bearing a N,O-coordinated α-amino-acylchloride ligand. The presumed species formed during the first stages of the MoCl5/l-phenylalanine interaction were DFT-elucidated, thus the calculated Gibbs free energy profile for the multi-step reaction of MoCl5 with l-phenylalanine was traced. [NH3CH(CH2Ph)C(O)Cl][MoOCl4], 3, acting as an intermediate in the course of the formation of 2a, was isolated by combination of [NH3CH(CH2Ph)C(O)Cl][Cl] with MoOCl3.
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Affiliation(s)
- Marco Bortoluzzi
- Ca' Foscari University of Venezia, Dipartimento di Scienze Molecolari e Nanosistemi, Dorsoduro 2137, I-30123 Venezia, Italy
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Bortoluzzi M, Marchetti F, Murrali MG, Pampaloni G, Zacchini S. The chlorinating behaviour of WCl6 towards α-aminoacids. Dalton Trans 2015; 44:8729-38. [DOI: 10.1039/c5dt00518c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
WCl6 behaves as a selective chlorinating agent towards the carboxylic function of primary and secondary α-aminoacids. The initial formation of α-ammonium acylchloride salts may be followed by HCl elimination and, in the case of l-proline derived species, a clean cyclization reaction.
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Affiliation(s)
- Marco Bortoluzzi
- University of Venezia Ca’ Foscari
- Dipartimento di Scienze Molecolari e Nanosistemi
- I-30123 Venezia
- Italy
| | - Fabio Marchetti
- University of Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56124 Pisa
- Italy
| | - Maria Grazia Murrali
- University of Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56124 Pisa
- Italy
| | - Guido Pampaloni
- University of Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56124 Pisa
- Italy
| | - Stefano Zacchini
- University of Bologna
- Dipartimento di Chimica Industriale “Toso Montanari”
- I-40136 Bologna
- Italy
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Synthesis and biological evaluation of achiral indole-substituted titanocene dichloride derivatives. INTERNATIONAL JOURNAL OF MEDICINAL CHEMISTRY 2012; 2012:905981. [PMID: 25954531 PMCID: PMC4412094 DOI: 10.1155/2012/905981] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Revised: 03/15/2012] [Accepted: 03/15/2012] [Indexed: 11/17/2022]
Abstract
Six new titanocene compounds have been isolated and characterised. These compounds were synthesised from their fulvene precursors using Super Hydride (LiBEt3H) followed by transmetallation with titanium tetrachloride to yield the corresponding titanocene dichloride derivatives. These complexes are bis-[((1-methyl-3-diethylaminomethyl)indol-2-yl)methylcyclopentadienyl] titanium (IV) dichloride (5a), bis-[((5-methoxy-1-methyl,3-diethylaminomethyl)indol-2-yl)methylcyclopentadienyl] titanium (IV) dichloride (5b), bis-[((1-methyl,3-diethylaminomethyl)indol-4-yl)methylcyclopentadienyl] titanium (IV) dichloride (5c), bis-[((5-bromo-1-methyl)indol-3-yl)methylcyclopentadienyl] titanium (IV) dichloride (5d), bis-[((5-chloro-1-methyl)indol-3-yl)methylcyclopentadienyl] titanium (IV) dichloride (5e), and bis-[((5-fluoro-1-methyl)indol-3-yl)methylcyclopentadienyl] titanium (IV) dichloride (5f). All six titanocenes 5a–5f were tested for their cytotoxicity through MTT-based in vitro tests on CAKI-1 cell lines using DMSO and Soluphor P as solubilising agents in order to determine their IC50 values. Titanocenes 5a–5f were found to have IC50 values of 10 (±2), 21 (±3), 29 (±4), 140 (±6), and 450 (±10) μM when tested using DMSO.
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Morales A, Santana A, Althoff G, Melendez E. Host-Guest Interactions between Calixarenes and Cp(2)NbCl(2). J Organomet Chem 2011; 696:2519-2527. [PMID: 21709809 PMCID: PMC3119540 DOI: 10.1016/j.jorganchem.2011.03.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The possible inclusion complexes of Cp(2)NbCl(2) into calixarenes hosts have been investigated. The existence of a true inclusion complex in the solid state was confirmed by a combination of NMR, ab-initio calculations, thermogravimetric analysis, FTIR, Raman and PXRD. Ab-initio calculations, (1)H NMR solution and solid state (13)C CP MAS NMR results demonstrated that p-sulfonic calix[6]arene does form an inclusion complex with Cp(2)NbCl(2). Raman spectroscopy showed, for the inclusion compound of p-sulfonic calix[6]arene-Cp(2)NbCl(2), a band between 500-850 cm(-1) characteristic of Nb-O vibration. This result suggests that Nb(V) may engage in coordination with the oxygen of the sulfonate group, as part of the host-guest interaction. However, it is important to mention that the niobocene dichloride (Cp(2)NbCl(2)) dissolves in water and undergoes oxidation and hydrolysis processes to yield Cp(2)NbCl(2)(OH) species. For that reason this band does not exclude that the Nb-O band belongs to Cp(2)NbCl(2)(OH). Solid State (13)C CP MAS NMR and solution (1)H NMR spectroscopies together with ab-initio results showed that Cp(2)NbCl(2) is included in the p-sulfonic calix[6]arene cavity, with both Cp rings inside the cavity. In contrast, the solution (1)H NMR results demonstrated that calix[6]arene does not form inclusion complex with Cp(2)NbCl(2) in CDCl(3) solution. Cp(2)NbCl(2) is not included in the calix[6]arene cavity, possibly due to the lack of sulfonate heads which promote Nb-O interactions and assist the inclusion of Cp(2)NbCl(2) into the cavity.
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Affiliation(s)
- Alexis Morales
- Department of Chemistry, University of Puerto Rico, Mayagüez, PR 00681
| | - Alberto Santana
- Department of Chemistry, University of Puerto Rico, Mayagüez, PR 00681
| | - Gerhard Althoff
- Bruker BioSpin GmbH, Silberstreifen, 76287 Rheinstetten Germany
| | - Enrique Melendez
- Department of Chemistry, University of Puerto Rico, Mayagüez, PR 00681
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Li JL, Gao ZW, Sun P, Gao LX, Tikkanen W. Ethanol catalyzed synthesis of titanocene aryl carboxylate complexes and crystal structure of (η5-C5H5)2Ti(2-OH-5-S–O2CC6H3)2. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2010.12.037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Affiliation(s)
- Gilles Gasser
- Institute of Inorganic Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
- Chair of Inorganic Chemistry I, Bioinorganic Chemistry, Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstrasse 150, 44801 Bochum, Germany
| | - Ingo Ott
- Institute of Pharmaceutical Chemistry, Technische Universität Braunschweig, Beethovenstrasse 55, 38106 Braunschweig, Germany
| | - Nils Metzler-Nolte
- Chair of Inorganic Chemistry I, Bioinorganic Chemistry, Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstrasse 150, 44801 Bochum, Germany
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Niobium uptake and release by bacterial ferric ion binding protein. Bioinorg Chem Appl 2010:307578. [PMID: 20445753 PMCID: PMC2860717 DOI: 10.1155/2010/307578] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2010] [Accepted: 02/11/2010] [Indexed: 11/28/2022] Open
Abstract
Ferric ion binding proteins (Fbps) transport FeIII across the periplasm and are vital for the virulence of many Gram negative bacteria. Iron(III) is tightly bound in a hinged binding cleft with octahedral coordination geometry involving binding to protein side chains (including tyrosinate residues) together with a synergistic anion such as phosphate. Niobium compounds are of interest for their potential biological activity, which has been little explored. We have studied the binding of cyclopentadienyl and nitrilotriacetato NbV complexes to the Fbp from Neisseria gonorrhoeae by UV-vis spectroscopy, chromatography, ICP-OES, mass spectrometry, and Nb K-edge X-ray absorption spectroscopy. These data suggest that NbV binds strongly to Fbp and that a dinuclear NbV centre can be readily accommodated in the interdomain binding cleft. The possibility of designing niobium-based antibiotics which block iron uptake by pathogenic bacteria is discussed.
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Pereira CCL, Diogo CV, Burgeiro A, Oliveira PJ, Marques MPM, Braga SS, Paz FAA, Pillinger M, Gonçalves IS. Complex Formation between Heptakis(2,6-di-O-methyl)-β-cyclodextrin and Cyclopentadienyl Molybdenum(II) Dicarbonyl Complexes: Structural Studies and Cytotoxicity Evaluations. Organometallics 2008. [DOI: 10.1021/om800413w] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Cláudia C. L. Pereira
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| | - Cátia V. Diogo
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| | - Ana Burgeiro
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| | - Paulo J. Oliveira
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| | - Maria Paula M. Marques
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| | - Susana S. Braga
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| | - Filipe A. Almeida Paz
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| | - Martyn Pillinger
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
| | - Isabel S. Gonçalves
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Center for Neuroscience and Cell Biology, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal, and Department of Biochemistry, Faculty of Science and Technology, University of Coimbra, Apartado 3126, 3001-401 Coimbra, Portugal
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11
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Buck DP, Abeysinghe PM, Cullinane C, Day AI, Collins JG, Harding MM. Inclusion complexes of the antitumour metallocenes Cp2MCl2 (M = Mo, Ti) with cucurbit[n]urils. Dalton Trans 2008:2328-34. [PMID: 18414758 DOI: 10.1039/b718322d] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Damian P Buck
- School of Physical, Environmental and Mathematical Sciences, University College, Australian Defence Force Academy, Canberra, ACT 2600, Australia
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12
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Pereira CCL, Nolasco M, Braga SS, Paz FAA, Ribeiro-Claro P, Pillinger M, Gonçalves IS. A Combined Theoretical−Experimental Study of the Inclusion of Niobocene Dichloride in Native and Permethylated β-Cyclodextrins. Organometallics 2007. [DOI: 10.1021/om7003749] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
| | - Mariela Nolasco
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Susana S. Braga
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | | | - Paulo Ribeiro-Claro
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Martyn Pillinger
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Isabel S. Gonçalves
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
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Breno KL, Ahmed TJ, Pluth MD, Balzarek C, Tyler DR. Organometallic chemistry in aqueous solution: Reactions catalyzed by water-soluble molybdocenes. Coord Chem Rev 2006. [DOI: 10.1016/j.ccr.2005.12.001] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Waern JB, Harris HH, Lai B, Cai Z, Harding MM, Dillon CT. Intracellular mapping of the distribution of metals derived from the antitumor metallocenes. J Biol Inorg Chem 2005; 10:443-52. [PMID: 15906108 DOI: 10.1007/s00775-005-0649-1] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2004] [Accepted: 04/11/2005] [Indexed: 10/25/2022]
Abstract
The intracellular distribution of transition metals in V79 Chinese hamster lung cells treated with subtoxic doses of the organometallic anticancer complexes Cp(2)MCl(2), where Cp is eta (5) -cyclopentadienyl and M is Mo, Nb, Ti, or V, has been studied by synchrotron-based X-ray fluorescence (XRF). While significantly higher concentrations of Mo and Nb were found in treated cells compared with control cells, distinct differences in the cellular distribution of each metal were observed. Analysis of thin sections of cells was consistent with some localization of Mo in the nucleus. Studies with a noncytotoxic thiol derivative of molybdocene dichloride showed an uneven distribution of Mo in the cells. For comparison, the low levels of Ti and V in cells treated with the more toxic titanocene and vanadocene complexes, respectively, resulted in metal concentrations at the detection limit of XRF. The results agree with independent chemical studies that have concluded that the biological chemistry of each of the metallocene dihalides is unique.
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Affiliation(s)
- Jenny B Waern
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
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16
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Waern JB, Harding MM. Coordination chemistry of the antitumor metallocene molybdocene dichloride with biological ligands. Inorg Chem 2004; 43:206-13. [PMID: 14704069 DOI: 10.1021/ic034892q] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The relative affinity of molybdocene dichloride (Cp(2)MoCl(2)) for the thiol, amino, carboxylate, phosphate(O) and heterocyclic(N) donor ligands present in amino acids and nucleotides, has been studied in aqueous solutions at pH 2-7, using (1)H, (13)C and (31)P NMR spectroscopy. Molybdocene dichloride forms the highly water soluble, air-stable complexes Cp(2)Mo(Cys)(2) and Cp(2)Mo(GS)(2) with cysteine and glutathione respectively, via coordination of the deprotonated thiol groups. While coordination to the imidazole nitrogen in histidine was observed, no evidence for coordination of the amino or carboxylate groups in the amino acids cysteine, histidine, alanine or lysine to Cp(2)MoCl(2) was detected. Competition experiments with dAMP, ribose monophosphate and histidine showed preferential coordination to the cysteine thiol over the phosphate(O) and heterocyclic(N) groups. Cp(2)Mo(Cys)(2) is stable in the presence of excess dAMP or ribose monophosphate and Cys displaces coordinated histidine, dAMP or ribose monophosphate to give Cp(2)Mo(Cys)(2). These results provide further evidence against interaction with DNA as the key interaction that is related to the antitumor activity of molybdocene dichloride. The implications of these results for the biological activity of the antitumor metallocene and the likely species formed in vivo are discussed.
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Affiliation(s)
- Jenny B Waern
- School of Chemistry, The University of Sydney, NSW 2006, Australia
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Meng X, Yang P, Chen H. Study of the coordination of amino acids with metals using [trans-en2Os(eta2-H2)L]2+ as a 1H NMR probe. J Inorg Biochem 2002; 92:28-36. [PMID: 12230985 DOI: 10.1016/s0162-0134(02)00482-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This is a study of the interaction of 23 kinds of amino acids, peptides and their analogues with Os((II)) at different pD values. Experiments show that in acidic conditions, the carboxyl group in amino acids can coordinate with Os((II)), and there exists H-D coupling of the dihydrogen of the probe with D2O in strongly acidic conditions, N does not coordinate with Os((II)); In alkaline conditions, the carboxyl group can coordinate with Os, and the coordinating species have trans and cis isomers, and the trans isomer can convert to cis with time; N of -NH2- in alpha-amino group can coordinate with Os((II)) while that in gamma-amino-n-butyric acid cannot do that. Since the target of some anti tumor agents are nucleic acids and proteins, we demonstrate a competitive mode to study how the anti tumor complex Me2SnCl2 binds to amino acid Ala, and the minimum binding amount and formation constant of the metal anti tumor metal complexes binding with amino acid are also obtained.
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Affiliation(s)
- Xiangli Meng
- Institute of Molecular Science, Shanxi University, Taiyuan, PR China
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Abstract
The ability of antitumor active metallocenes Cp2MCl2, (M=Ti, V, Mo, Nb) and the biologically inactive derivative (MeCp)2TiCl2, to inhibit the relaxation of supercoiled plasmid DNA pBR322 by human topoisomerase II has been studied by gel electrophoresis. All metallocenes inhibit the enzyme with maximum inhibition observed at 2.0 mM (Cp2TiCl2), 3.0 mM (Cp2MoCl2), 0.2 mM (Cp2NbCl2), 0.25 mM (Cp2VCl2) and 2.0 mM (MeCpTiCl2). The implications for the mechanism of antitumor activity of the metallocene dihalides are discussed.
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Affiliation(s)
- G Mokdsi
- School of Chemistry, University of Sydney, NSW, Australia
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19
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Balzarek C, Weakley TJR, Tyler DR. C−H Bond Activation in Aqueous Solution: Kinetics and Mechanism of H/D Exchange in Alcohols Catalyzed by Molybdocenes. J Am Chem Soc 2000. [DOI: 10.1021/ja001535v] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christoph Balzarek
- Contribution from the Department of Chemistry, University of Oregon, Eugene, Oregon 97403
| | - Timothy J. R. Weakley
- Contribution from the Department of Chemistry, University of Oregon, Eugene, Oregon 97403
| | - David R. Tyler
- Contribution from the Department of Chemistry, University of Oregon, Eugene, Oregon 97403
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Affiliation(s)
- A Y Louie
- Department of Biology, Biological Imaging Center, Beckman Institute, California Institute of Technology, Pasadena, California 91125
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Abstract
Inorganic complexes have long been utilized for many therapeutic purposes. They were used or tried, perhaps because of the general notion that inorganic compounds (e.g., metal complexes) are toxic and a controlled use of such a compound may suppress some biological process. In this review, we briefly outline the properties of several selected groups of inorganic complexes and how they can affect biological systems and contribute to human pathologies.
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Affiliation(s)
- R Bakhtiar
- Department of Chemistry and Chemical Biology, Stevens Institute of Technology, Castle Point on Hudson, Hoboken, New Jersey 07030, USA
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24
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Harding MM, Mokdsi G, Mackay JP, Prodigalidad M, Lucas SW. Interactions of the Antitumor Agent Molybdocene Dichloride with Oligonucleotides. Inorg Chem 1998. [DOI: 10.1021/ic971205k] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Margaret M. Harding
- School of Chemistry and Department of Biochemistry, University of Sydney, NSW 2006, Australia
| | - George Mokdsi
- School of Chemistry and Department of Biochemistry, University of Sydney, NSW 2006, Australia
| | - Joel P. Mackay
- School of Chemistry and Department of Biochemistry, University of Sydney, NSW 2006, Australia
| | - Michael Prodigalidad
- School of Chemistry and Department of Biochemistry, University of Sydney, NSW 2006, Australia
| | - Sallyanne Wright Lucas
- School of Chemistry and Department of Biochemistry, University of Sydney, NSW 2006, Australia
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