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Berto S, Blasco S, Castellino L, Cvetkovski A, De Stefano C, Gama S, García-España E, Hermann P, Lando G, Marafante M, Meyer M, Plass W, Quinodoz L, Milea D. A tutorial on potentiometric data processing. Analysis of software for optimization of protonation constants. Anal Chim Acta 2024; 1303:342476. [PMID: 38609256 DOI: 10.1016/j.aca.2024.342476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 03/11/2024] [Accepted: 03/12/2024] [Indexed: 04/14/2024]
Abstract
Defining the distribution of the chemical species in a multicomponent system is a task of great importance with applications in many fields. To clarify the identity and the abundance of the species that can be formed by the interaction of the components of a solution, it is fundamental to know the formation constants of those species. The determination of equilibrium constants is mainly performed through the analysis of experimental data obtained by different instrumental techniques. Among them, potentiometry is the elective technique for this purpose. As such, a survey was run within the NECTAR COST Action - Network for Equilibria and Chemical Thermodynamics Advanced Research, to identify the most used software for the analysis of potentiometric data and to highlight their strengths and weaknesses. The features and the calculation processes of each software were analyzed and rationalized, and a simulated titration dataset of a hypothetic hexaprotic acid was processed by each software to compare and discuss the optimized protonation constants. Moreover, further data analysis was also carried out on the original dataset including some systematic errors from different sources, as some calibration parameters, the total analytical concentration of reagents and ionic strength variations during titrations, to evaluate their impact on the refined parameters. Results showed that differences on the protonation constants estimated by the tested software are not significant, while some of the considered systematic errors affect results. Overall, it emerged that software commonly used suffer from many limitations, highlighting the urgency of new dedicated and modern tools. In this context, some guidelines for data generation and treatment are also given.
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Affiliation(s)
- Silvia Berto
- Università di Torino, Dipartimento di Chimica, Via P. Giuria 7, 10125, Torino, Italy.
| | - Salvador Blasco
- Institute of Molecular Sciences, Departamento de Química Inorgánica, University of Valencia, C/Catedrático José Beltrán Martínez 2, 46980, Paterna, Valencia, Spain
| | - Lorenzo Castellino
- Università di Torino, Dipartimento di Chimica, Via P. Giuria 7, 10125, Torino, Italy
| | - Aleksandar Cvetkovski
- Faculty of Medical Sciences, Goce Delcev Universit, Krste Misirkov Bb, PO 201, 2000, Štip, Macedonia
| | - Concetta De Stefano
- Università degli Studi di Messina, Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, CHIBIOFARAM, V.le F. Stagno d'Alcontres, 31, 98166, Messina, Italy
| | - Sofia Gama
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10 (km 139.7), 2695-066, Bobadela LRS, Portugal
| | - Enrique García-España
- Institute of Molecular Sciences, Departamento de Química Inorgánica, University of Valencia, C/Catedrático José Beltrán Martínez 2, 46980, Paterna, Valencia, Spain
| | - Petr Hermann
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic
| | - Gabriele Lando
- Università degli Studi di Messina, Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, CHIBIOFARAM, V.le F. Stagno d'Alcontres, 31, 98166, Messina, Italy
| | - Matteo Marafante
- Università di Torino, Dipartimento di Chimica, Via P. Giuria 7, 10125, Torino, Italy
| | - Michel Meyer
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), UMR 6302, CNRS, Université de Bourgogne, 9 avenue Alain Savary, BP 47870, 21078, Dijon, Cedex, France
| | - Winfried Plass
- Institut für Anorganische und Analytische Chemie, Friedrich Schiller University Jena, Humboldtstr 8, D-07743, Jena, Germany
| | - Lauryn Quinodoz
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), UMR 6302, CNRS, Université de Bourgogne, 9 avenue Alain Savary, BP 47870, 21078, Dijon, Cedex, France; University of Applied Sciences Western Switzerland HES-SO, Haute Ecole d'Ingénierie et d'Architecture, Pérolles 80, 1700, Fribourg, Switzerland
| | - Demetrio Milea
- Università degli Studi di Messina, Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, CHIBIOFARAM, V.le F. Stagno d'Alcontres, 31, 98166, Messina, Italy
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Svítok A, Blahut J, Urbanovský P, Hermann P. Dynamics of Coordinated Phosphonate Group Directly Observed by 17O-NMR in Lanthanide(III) Complexes of a Mono(ethyl phosphonate) DOTA Analogue. Chemistry 2024:e202400970. [PMID: 38624256 DOI: 10.1002/chem.202400970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Revised: 04/15/2024] [Accepted: 04/16/2024] [Indexed: 04/17/2024]
Abstract
Biological phosphates can coordinate metal ions and their complexes are common in living systems. Dynamics of mutual oxygen atom exchange in the tetrahedral group in complexes has not been investigated. Here, we present a direct experimental proof of the exchange ("phosphonate rotation") in model Ln(III) complexes of monophosphonate H4dota analogue which alters phosphorus atom chirality of coordinated phosphonate monoester. Combination of macrocycle-based isomerism with P-based chirality leads to several diastereoisomers. The (non)-coordinated oxygens were distinguished through 17O-labelled phosphonate group and their mutual exchange was followed by various NMR techniques and DFT calculations. The process is sterically demanding and occurs through bulky bidentate (k2-PO2)- coordination. It was observed on complexes of large Ln(III) ions in twisted-square antiprism diastereoisomers. The process energy increases for smaller Ln(III) ions (298ΔG‡(exp./DFT) = 51.8/52.1 and 61.0 / 71.5 kJ mol-1 for La(III) and Eu(III), respectively). These results are helpful in design of such complexes for MRI and protein paramagnetic NMR probes. It demonstrates usefulness of 17O NMR to study solution dynamics in complexes involving phosphorus acid derivatives. The results may inspire use of this method to study dynamics of phosphoric acid derivatives (as e.g. phosphorus acid-based inhibitors of metalloenzymes) in different areas of chemistry.
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Affiliation(s)
- Adam Svítok
- Charles University, Department of Inorganic Chemistry, Hlavova 2030, 12843, Prague, CZECH REPUBLIC
| | - Jan Blahut
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences, Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, CZECH REPUBLIC
| | - Peter Urbanovský
- Charles University, Department of Inorganic Chemistry, Hlavova 2030, 12843, Prague 2, CZECH REPUBLIC
| | - Petr Hermann
- Universita Karlova, Department of Inorganic Chemistry, Hlavova 2030, 12840, Prague 2, CZECH REPUBLIC
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3
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Koucký F, Dobrovolná T, Kotek J, Císařová I, Havlíčková J, Liška A, Kubíček V, Hermann P. Transition metal complexes of the (2,2,2-trifluoroethyl)phosphinate NOTA analogue as potential contrast agents for 19F magnetic resonance imaging. Dalton Trans 2024. [PMID: 38596878 DOI: 10.1039/d4dt00507d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/11/2024]
Abstract
A new hexadentate 1,4,7-triazacyclononane-based ligand bearing three coordinating methylene-(2,2,2-trifluoroethyl)phosphinate pendant arms was synthesized and its coordination behaviour towards selected divalent (Mg2+, Ca2+, Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+) and trivalent (Cr3+, Fe3+, Co3+) transition metal ions was studied. The ligand forms stable complexes with late divalent transition metal ions (from Co2+ to Zn2+) and the complexes of these metal ions are formed above pH ∼3. A number of complexes with divalent metal ions were structurally characterized by means of single-crystal X-ray diffraction. The complex of the larger Mn2+ ion adopts a twisted trigonally antiprismatic geometry with a larger coordination cavity and smaller torsion of the pendant arms, whereas the smaller ions Ni2+, Cu2+ and Zn2+ form octahedral species with a smaller cavity and larger pendant arm torsion. In the case of the Co2+ complexes, both coordination arrangements were observed. The complexes with paramagnetic metal ions were studied from the point of view of potential utilization in 19F magnetic resonance imaging. A significant shortening of the 19F NMR longitudinal relaxation times was observed: a sub-millisecond range for complexes of Cr3+, Mn2+ and Fe3+ with symmetric electronic states (t2g3 and HS-d5), the millisecond range for the Ni2+ and Cu2+ complexes and tens of milliseconds for the Co2+ complex. Such short relaxation times are consistent with a short distance between the paramagnetic metal ion and the fluorine atoms (∼5.5-6.5 Å). Among the redox-active complexes (Mn3+/Mn2+, Fe3+/Fe2+, Co3+/Co2+, Cu2+/Cu+), the cobalt complexes show sufficient stability and a paramagnetic-diamagnetic changeover with the redox potential lying in a physiologically relevant range. Thus, the Co3+/Co2+ complex pair can be potentially used as a smart redox-responsive contrast agent for 19F MRI.
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Affiliation(s)
- Filip Koucký
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Tereza Dobrovolná
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Jan Kotek
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Ivana Císařová
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Jana Havlíčková
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Alan Liška
- Department of Molecular Electrochemistry and Catalysis, J. Heyrovský Institute of Physical Chemistry AS CR, Dolejškova 2155/3, 182 23 Prague 8, Czech Republic
| | - Vojtěch Kubíček
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Petr Hermann
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
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Price T, Wagner L, Rosecker V, Havlíčková J, Prior TJ, Kubíček V, Hermann P, Stasiuk GJ. Inorganic Chemistry of the Tripodal Picolinate Ligand Tpaa with Gallium(III) and Radiolabeling with Gallium-68. Inorg Chem 2023; 62:20769-20776. [PMID: 37793007 PMCID: PMC10731648 DOI: 10.1021/acs.inorgchem.3c02459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Indexed: 10/06/2023]
Abstract
We report here the improved synthesis of the tripodal picolinate chelator Tpaa, with an overall yield of 41% over five steps, in comparison to the previously reported 6% yield. Tpaa was investigated for its coordination chemistry with Ga(III) and radiolabeling properties with gallium-68 (68Ga). The obtained crystal structure for [Ga(Tpaa)] shows that the three picolinate arms coordinate to the Ga(III) ion, fully occupying the octahedral coordination geometry. This is supported by 1H NMR which shows that the three arms are symmetrical when coordinated to Ga(III). Assessment of the thermodynamic stability through potentiometry gives log KGa-Tpaa = 21.32, with a single species being produced across the range of pH 3.5-7.5. Tpaa achieved >99% radiochemical conversion with 68Ga under mild conditions ([Tpaa] = 6.6 μM, pH 7.4, 37 °C) with a molar activity of 3.1 GBq μmol-1. The resulting complex, [68Ga][Ga(Tpaa)], showed improved stability over the previously reported [68Ga][Ga(Dpaa)(H2O)] in a serum challenge, with 32% of [68Ga][Ga(Tpaa)] remaining intact after 30 min of incubation with fetal bovine serum.
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Affiliation(s)
- Thomas
W. Price
- Department
of Imaging Chemistry and Biology, School of Biomedical Engineering
and Imaging Sciences, King’s College
London, London SE1 7EH, United
Kingdom
| | - Laurène Wagner
- Department
of Imaging Chemistry and Biology, School of Biomedical Engineering
and Imaging Sciences, King’s College
London, London SE1 7EH, United
Kingdom
| | - Veronika Rosecker
- Department
of Imaging Chemistry and Biology, School of Biomedical Engineering
and Imaging Sciences, King’s College
London, London SE1 7EH, United
Kingdom
| | - Jana Havlíčková
- Department
of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic
| | - Timothy J. Prior
- Chemistry,
School of Natural Sciences, University of
Hull, Cottingham Road, Hull HU6 7RX, United Kingdom
| | - Vojtěch Kubíček
- Department
of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic
| | - Petr Hermann
- Department
of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic
| | - Graeme J. Stasiuk
- Department
of Imaging Chemistry and Biology, School of Biomedical Engineering
and Imaging Sciences, King’s College
London, London SE1 7EH, United
Kingdom
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Koucký F, Kotek J, Císařová I, Havlíčková J, Kubíček V, Hermann P. Transition metal complexes of cyclam with two 2,2,2-trifluoroethylphosphinate pendant arms as probes for 19F magnetic resonance imaging. Dalton Trans 2023; 52:12208-12223. [PMID: 37401675 DOI: 10.1039/d3dt01420g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/05/2023]
Abstract
A new cyclam-based ligand bearing two methylene(2,2,2-trifluoroethyl)phosphinate pendant arms was synthesized and its coordination behaviour towards selected divalent transition metal ions [Co(II), Ni(II), Cu(II), Zn(II)] was studied. The ligand was found to be very selective for the Cu(II) ion according to the common Williams-Irving trend. Complexes with all the studied metal ions were structurally characterized. The Cu(II) ion forms two isomeric complexes; the pentacoordinated isomer pc-[Cu(L)] is the kinetic product and the octahedral trans-O,O'-[Cu(L)] isomer is the final (thermodynamic) product of the complexation reaction. Other studied metal ions form octahedral cis-O,O'-[M(L)] complexes. The complexes with paramagnetic metal ions showed a significant shortening of 19F NMR longitudinal relaxation times (T1) to the millisecond range [Ni(II) and Cu(II) complexes] or tens of milliseconds [Co(II) complex] at the temperature and magnetic field relevant for 19F magnetic resonance imaging (MRI). Such a short T1 results from a short distance between the paramagnetic metal ion and the fluorine atoms (∼6.1-6.4 Å). The complexes show high kinetic inertness towards acid-assisted dissociation; in particular, the trans-O,O'-[Cu(L)] complex was found to be extremely inert with a dissociation half-time of 2.8 h in 1 M HCl at 90 °C. Together with the short relaxation time, it potentially enables in vitro/in vivo utilization of the complexes as efficient contrast agents for 19F MRI.
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Affiliation(s)
- Filip Koucký
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Jan Kotek
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Ivana Císařová
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Jana Havlíčková
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Vojtěch Kubíček
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Petr Hermann
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
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Kotková Z, Koucký F, Kotek J, Císařová I, Parker D, Hermann P. Copper(II) complexes of cyclams with N-(2,2,2-trifluoroethyl)-aminoalkyl pendant arms as potential probes for 19F magnetic resonance imaging. Dalton Trans 2023; 52:1861-1875. [PMID: 36448539 DOI: 10.1039/d2dt03360g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A series of Cu(II) complexes with cyclam-based ligands containing two N-(2,2,2-trifluoroethyl)-aminoalkyl pendant arms in 1,8-positions (L1: 1,2-ethylene spacer, L2: 1,3-propylene spacer; L3: 1,4-butylene spacer) was studied in respect to potential use as contrast agents for 19F magnetic resonance imaging (MRI). A number of structures of the complexes as well as of several organic precursors were determined by single-crystal X-ray diffraction analysis. Geometric parameters (especially distances between fluorine atoms and the central metal ion) were determined for each complex and the identity of isomeric complex species present in solution was established. The NMR longitudinal relaxation times (T1) of 19F nuclei in the ligands at clinically relevant fields and temperatures (1-2 s) were significantly shortened upon Cu(II) binding to 7-10 ms for [Cu(L1)]2+, 20-30 ms for [Cu(L2)]2+ and 20-50 ms for [Cu(L3)]2+. The trend of the relaxation time shortening is in accordance with the distance and number of chemical bonds between fluorine atoms and the Cu(II) ion. The signals show promising T2*/T1 ratios in the range 0.25-0.55, assuring their good applicability to 19F NMR/MRI. The results show that even the Cu(II) ion, with a small magnetic moment, causes significant relaxation enhancement with a long-range effect and can be considered as a highly suitable metal ion for efficient 19F MRI contrast agents.
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Affiliation(s)
- Zuzana Kotková
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Filip Koucký
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Jan Kotek
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - Ivana Císařová
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
| | - David Parker
- Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong
| | - Petr Hermann
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 42 Prague 2, Czech Republic.
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Maďar M, Koláčná L, Koucký F, Havlíčková J, Kuchár J, Kotek J, Kubíček V, Ludvík J, Hermann P. Derivatives of cyclam-1,8-diacetic acid: synthesis and complexes with divalent transition metal ions. J Organomet Chem 2023. [DOI: 10.1016/j.jorganchem.2023.122641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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8
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Urbanovsky P, Kubinec J, Kotek J, Hermann P. Scandium(III) and macrocyclic cavity of DOTA-like ligands: implications for design of chelators for scandium radioisotopes. Nucl Med Biol 2022. [DOI: 10.1016/s0969-8051(22)02225-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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9
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Price TW, Renard I, Prior TJ, Kubíček V, Benoit DM, Archibald SJ, Seymour AM, Hermann P, Stasiuk GJ. Bn2DT3A, a Chelator for 68Ga Positron Emission Tomography: Hydroxide Coordination Increases Biological Stability of [ 68Ga][Ga(Bn 2DT3A)(OH)] . Inorg Chem 2022; 61:17059-17067. [PMID: 36251390 DOI: 10.1021/acs.inorgchem.2c01992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The chelator Bn2DT3A was used to produce a novel 68Ga complex for positron emission tomography (PET). Unusually, this system is stabilized by a coordinated hydroxide in aqueous solutions above pH 5, which confers sufficient stability for it to be used for PET. Bn2DT3A complexes Ga3+ in a hexadentate manner, forming a mer-mer complex with log K([Ga(Bn2DT3A)]) = 18.25. Above pH 5, the hydroxide ion coordinates the Ga3+ ion following dissociation of a coordinated amine. Bn2DT3A radiolabeling displayed a pH-dependent speciation, with [68Ga][Ga(Bn2DT3A)(OH)]- being formed above pH 5 and efficiently radiolabeled at pH 7.4. Surprisingly, [68Ga][Ga(Bn2DT3A)(OH)]- was found to show an increased stability in vitro (for over 2 h in fetal bovine serum) compared to [68Ga][Ga(Bn2DT3A)]. The biodistribution of [68Ga][Ga(Bn2DT3A)(OH)]- in healthy rats showed rapid clearance and excretion via the kidneys, with no uptake seen in the lungs or bones.
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Affiliation(s)
- Thomas W Price
- Department of Imaging Chemistry and Biology, School of Biomedical Engineering and Imaging Sciences, King's College London, London SE1 7EH, U.K.,Department of Biomedical Sciences, University of Hull, Cottingham Road, Hull HU6 7RX, U.K.,Positron Emission Tomography Research Center, University of Hull, Cottingham Road, Hull HU6 7RX, U.K
| | - Isaline Renard
- Department of Biomedical Sciences, University of Hull, Cottingham Road, Hull HU6 7RX, U.K.,Positron Emission Tomography Research Center, University of Hull, Cottingham Road, Hull HU6 7RX, U.K
| | - Timothy J Prior
- Chemistry, University of Hull, Cottingham Road, Hull HU6 7RX, U.K
| | - Vojtěch Kubíček
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, Prague 2, Czech Republic
| | - David M Benoit
- E.A. Milne Centre for Astrophysics, Department of Physics and Mathematics, University of Hull, Cottingham Road, Hull HU6 7RX, U.K
| | - Stephen J Archibald
- Department of Biomedical Sciences, University of Hull, Cottingham Road, Hull HU6 7RX, U.K.,Positron Emission Tomography Research Center, University of Hull, Cottingham Road, Hull HU6 7RX, U.K
| | - Anne-Marie Seymour
- Department of Biomedical Sciences, University of Hull, Cottingham Road, Hull HU6 7RX, U.K
| | - Petr Hermann
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, Prague 2, Czech Republic
| | - Graeme J Stasiuk
- Department of Imaging Chemistry and Biology, School of Biomedical Engineering and Imaging Sciences, King's College London, London SE1 7EH, U.K
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10
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Pazderová L, Benešová M, Havlíčková J, Vojtíčková M, Kotek J, Lubal P, Ullrich M, Walther M, Schulze S, Neuber C, Rammelt S, Pietzsch HJ, Pietzsch J, Kubíček V, Hermann P. Cyclam with a phosphinate-bis(phosphonate) pendant arm is a bone-targeting carrier of copper radionuclides. Dalton Trans 2022; 51:9541-9555. [PMID: 35670322 DOI: 10.1039/d2dt01172g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ligands combining a bis(phosphonate) group with a macrocycle function as metal isotope carriers for radionuclide-based imaging and for treating bone metastases associated with several cancers. However, bis(phosphonate) pendant arms often slow down complex formation and decrease radiochemical yields. Nevertheless, their negative effect on complexation rates may be mitigated by using a suitable spacer between bis(phosphonate) and the macrocycle. To demonstrate the potential of bis(phosphonate) bearing macrocyclic ligands as a copper radioisotope carrier, we report the synthesis of a new cyclam derivative bearing a phosphinate-bis(phosphonate) pendant (H5te1PBP). The ligand showed a high selectivity to CuII over ZnII and NiII ions, and the bis(phosphonate) group was not coordinated in the CuII complex, strongly interacting with other metal ions in solution. The CuII complex formed quickly, in 1 s, at pH 5 and at a millimolar scale. The complexation rates significantly differed under a ligand or metal ion excess due to the formation of reaction intermediates differing in their metal-to-ligand ratio and protonation state, respectively. The CuII-te1PBP complex also showed a high resistance to acid-assisted hydrolysis (t1/2 2.7 h; 1 M HClO4, 25 °C) and was effectively adsorbed on the hydroxyapatite surface. H5te1PBP radiolabeling with [64Cu]CuCl2 was fast and efficient, with specific activities of approximately 30 GBq 64Cu per 1 μmol of ligand (pH 5.5, room temperature, 30 min). In a pilot experiment, we further demonstrated the excellent suitability of [64Cu]CuII-te1PBP for imaging active bone compartments by dedicated small animal PET/CT in healthy mice and subsequently in a rat femoral defect model, in direct comparison with [18F]fluoride. Moreover, [64Cu]CuII-te1PBP showed a higher uptake in critical bone defect regions. Therefore, our study highlights the potential of [64Cu]CuII-te1PBP as a PET radiotracer for evaluating bone healing in preclinical and clinical settings with a diagnostic value similar to that of [18F]fluoride, albeit with a longer half-life (12.7 h) than 18F (1.8 h), thereby enabling extended observation times.
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Affiliation(s)
- Lucia Pazderová
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic.
| | - Martina Benešová
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic. .,Research Group Molecular Biology of Systemic Radiotherapy, German Cancer Research Center, Im Neuenheimer Feld 223, 69120 Heidelberg, Germany
| | - Jana Havlíčková
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic.
| | - Margareta Vojtíčková
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic.
| | - Jan Kotek
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic.
| | - Přemysl Lubal
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Martin Ullrich
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiopharmaceutical Cancer Research, Bautzner Landstrasse 400, 01328 Dresden, Germany
| | - Martin Walther
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiopharmaceutical Cancer Research, Bautzner Landstrasse 400, 01328 Dresden, Germany
| | - Sabine Schulze
- Technische Universität Dresden, Faculty of Medicine, Centre for Translational Bone, Joint and Soft Tissue Research, Fetscherstrasse 74, 01307 Dresden, Germany
| | - Christin Neuber
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiopharmaceutical Cancer Research, Bautzner Landstrasse 400, 01328 Dresden, Germany
| | - Stefan Rammelt
- Technische Universität Dresden, University Hospital Carl Gustav Carus, University Center for Orthopaedics and Traumatology, Fetscherstrasse 74, 01307 Dresden, Germany
| | - Hans-Jürgen Pietzsch
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiopharmaceutical Cancer Research, Bautzner Landstrasse 400, 01328 Dresden, Germany.,Technische Universität Dresden, School of Science, Faculty of Chemistry and Food Chemistry, 01069 Dresden, Germany
| | - Jens Pietzsch
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiopharmaceutical Cancer Research, Bautzner Landstrasse 400, 01328 Dresden, Germany.,Technische Universität Dresden, School of Science, Faculty of Chemistry and Food Chemistry, 01069 Dresden, Germany
| | - Vojtěch Kubíček
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic.
| | - Petr Hermann
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic.
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11
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Enzelsberger SH, Oppelt P, Nirgianakis K, Seeber B, Drahoňovský J, Wanderer L, Krämer B, Grübling KN, Kundu S, Salehin D, Mierzwinski M, Krentel H, Hermann P, Wagner H, Shebl O, Schäfer S. Präoperative Anwendung der Enzian-Klassifikation für Endo metriose (cEnzian): Eine prospektive internationale Multicenter-Studie. Geburtshilfe Frauenheilkd 2022. [DOI: 10.1055/s-0042-1750221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
Affiliation(s)
- S-H Enzelsberger
- Department of Gynecology, Obstetrics and Gynecological Endocrinology, Kepler University Hospital, Johannes Kepler University Linz, Linz, Austria
| | - P Oppelt
- Department of Gynecology, Obstetrics and Gynecological Endocrinology, Kepler University Hospital, Johannes Kepler University Linz, Linz, Austria
| | - K Nirgianakis
- Department of Obstetrics and Gynecology, University Hospital and University of Bern, Bern, Switzerland
| | - B Seeber
- Department of Gynecologic Endocrinology and Reproductive Medicine, Medical University of Innsbruck, Innsbruck, Austria
| | - J Drahoňovský
- Institute for the Care of Mother and Child, Prague, Czech Republic
| | - L Wanderer
- Department of Gynecology and Obstetrics, Landesklinikum Melk, Melk, Austria
| | - B Krämer
- Department of Gynecology, University Hospital Tübingen, Tübingen, Germany
| | - K N Grübling
- Department of Gynecology and Obstetrics, University Hospital Carl Gustav Carus, Dresden, Germany
| | - S Kundu
- Department Gynaecology and Obstetrics, Hanover Medical School, Hannover, Germany
| | - D Salehin
- Department of Gynecology and Obstetrics, Johanniter Krankenhaus Mönchengladbach, Mönchengladbach, Germany
| | - M Mierzwinski
- Department of Gynecology and Obstetrics, St.-Johannes-Hospital, Dortmund, Germany
| | - H Krentel
- Department of Gynecology, Obstetrics and Gynecological Oncology, Bethesda Hospital, Academic Teaching Hospital, Duisburg, Germany
| | - P Hermann
- Center for Clinical Studies, Johannes Kepler University Linz, Linz, Austria
| | - H Wagner
- Center for Clinical Studies, Johannes Kepler University Linz, Linz, Austria
- Institute of Applied Statistics, Johannes Kepler University Linz, Linz, Austria
| | - O Shebl
- Department of Gynecology, Obstetrics and Gynecological Endocrinology, Kepler University Hospital, Johannes Kepler University Linz, Linz, Austria
| | - S Schäfer
- Department of Gynecology and Obstetrics, University Hospital Münster, Münster, Germany
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12
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Kubinec J, Širůčková V, Havlíčková J, Kotek J, Kubicek V, Lubal P, Hermann P. Complexes of NOTA‐monoamides with CuII ion: Structural, equilibrium and kinetic study. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jan Kubinec
- Univerzita Karlova Přírodovědecká fakulta: Univerzita Karlova Prirodovedecka fakulta Department of Inorganic Chemistry CZECH REPUBLIC
| | - Viktorie Širůčková
- Masarykova univerzita Přírodovědecká fakulta: Masarykova univerzita Prirodovedecka Fakulta Department of Chemistry CZECH REPUBLIC
| | - Jana Havlíčková
- PřF UK: Univerzita Karlova Prirodovedecka fakulta Department of Inorganic Chemistry CZECH REPUBLIC
| | - Jan Kotek
- Univerzita Karlova Prirodovedecka fakulta Department of Inorganic Chemistry CZECH REPUBLIC
| | - Vojtech Kubicek
- Charles University in Prague, Faculty of Science Department of Inorganic Chemistry Hlavova 2030 128 40 Prague 2 CZECH REPUBLIC
| | - Přemysl Lubal
- Masarykova univerzita Přírodovědecká fakulta: Masarykova univerzita Prirodovedecka Fakulta Department of Chemistry CZECH REPUBLIC
| | - Petr Hermann
- Univerzita Karlova Přírodovědecká fakulta: Univerzita Karlova Prirodovedecka fakulta Departmnet of Inorganic Chemistry CZECH REPUBLIC
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13
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Pazderová L, Kubíček V, Kotek J, Hermann P. 1,4,7‐Triazacyclononane (tacn) with
N,N
′‐bridging methylene‐bis(phosphinic acid) group and its complexes. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Lucia Pazderová
- Department of Inorganic Chemistry Faculty of Science Charles University Hlavova 8 128 40 Prague 2 Czech Republic
| | - Vojtěch Kubíček
- Department of Inorganic Chemistry Faculty of Science Charles University Hlavova 8 128 40 Prague 2 Czech Republic
| | - Jan Kotek
- Department of Inorganic Chemistry Faculty of Science Charles University Hlavova 8 128 40 Prague 2 Czech Republic
| | - Petr Hermann
- Department of Inorganic Chemistry Faculty of Science Charles University Hlavova 8 128 40 Prague 2 Czech Republic
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14
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Pazderová L, David T, Kotek J, Kubíček V, Hermann P. Complexes of cyclen side-bridged with a methylene-bis(phosphinate) group. Polyhedron 2021. [DOI: 10.1016/j.poly.2020.114994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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15
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Blahut J, Benda L, Kotek J, Pintacuda G, Hermann P. Paramagnetic Cobalt(II) Complexes with Cyclam Derivatives: Toward 19F MRI Contrast Agents. Inorg Chem 2020; 59:10071-10082. [DOI: 10.1021/acs.inorgchem.0c01216] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Jan Blahut
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 12843 Prague 2, Czech Republic
- High-Field NMR Centre, CNRS FRE2034/UCB de Lyon 1/ENS de Lyon, 5 rue de la Doua, 69100 Lyon-Villeurbanne, France
| | - Ladislav Benda
- High-Field NMR Centre, CNRS FRE2034/UCB de Lyon 1/ENS de Lyon, 5 rue de la Doua, 69100 Lyon-Villeurbanne, France
| | - Jan Kotek
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 12843 Prague 2, Czech Republic
| | - Guido Pintacuda
- High-Field NMR Centre, CNRS FRE2034/UCB de Lyon 1/ENS de Lyon, 5 rue de la Doua, 69100 Lyon-Villeurbanne, France
| | - Petr Hermann
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 12843 Prague 2, Czech Republic
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16
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Pazderová L, David T, Hlinová V, Plutnar J, Kotek J, Lubal P, Kubíček V, Hermann P. Cross-Bridged Cyclam with Phosphonate and Phosphinate Pendant Arms: Chelators for Copper Radioisotopes with Fast Complexation. Inorg Chem 2020; 59:8432-8443. [PMID: 32437603 DOI: 10.1021/acs.inorgchem.0c00856] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Cross-bridged cyclam derivatives bearing two phosphonate (H4L1), bis(phosphinate) (H4L2), or phosphinate (H2L3) pendant arms were synthesized and studied with respect to their application as copper radioisotope carriers in nuclear medicine. The ligands show high macrocycle basicity (pK1 > 14) and high Cu(II) complex stability (log K = 20-24). The complexation and dissociation kinetics of the Cu(II) complexes were studied by ultraviolet-visible spectroscopy. Phosphonate Cu(II)-H4L1 and bis(phosphinate) Cu(II)-H4L2 complexes form very quickly, reaching quantitative formation within 1 s at pH ∼6 and millimolar concentrations. Conversely, the formation of the phosphinate complex Cu(II)-H2L3 is much slower (9 min at pH ∼6) due to the low stability of the out-of-cage reaction intermediate. All studied complexes are highly kinetically inert, showing half-lives of 120, 11, and 111 h for Cu(II)-H4L1, Cu(II)-H4L2, and Cu(II)-H2L3 complexes, respectively, in 1 M HClO4 at 90 °C. The high thermodynamic stability, fast formation, and extreme kinetic inertness of Cu(II) complexes indicate that phosphonate and bis(phosphinate) derivatives are promising ligands for nuclear medicine.
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Affiliation(s)
- Lucia Pazderová
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic
| | - Tomáš David
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic
| | - Veronika Hlinová
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic
| | - Jan Plutnar
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic
| | - Jan Kotek
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic
| | - Přemysl Lubal
- Department of Chemistry, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
| | - Vojtěch Kubíček
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic
| | - Petr Hermann
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic
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Urbanovský P, Kotek J, Císařová I, Hermann P. Selective and clean synthesis of aminoalkyl- H-phosphinic acids from hypophosphorous acid by phospha-Mannich reaction. RSC Adv 2020; 10:21329-21349. [PMID: 35518776 PMCID: PMC9059144 DOI: 10.1039/d0ra03075a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Accepted: 05/15/2020] [Indexed: 12/25/2022] Open
Abstract
Aminoalkyl-H-phosphinic acids, also called aminoalkylphosphonous acids, are investigated as biologically active analogues of carboxylic amino acids and/or as valuable intermediates for synthesis of other aminoalkylphosphorus acids. Their synthesis has been mostly accomplished by phospha-Mannich reaction of a P–H precursor, an aldehyde and an amine. The reaction is rarely clean and high-yielding. Here, reaction of H3PO2 with secondary amines and formaldehyde in wet AcOH led to aminomethyl-H-phosphinic acids in nearly quantitative yields and with almost no by-products. Surprisingly, the reaction outcome depended on the basicity of the amines. Amines with pKa > 7–8 gave the desired products. For less basic amines, reductive N-methylation coupled with oxidation of H3PO2 to H3PO3 became a relevant side reaction. Primary amines reacted less clearly and amino-bis(methyl-H-phosphinic acids) were obtained only for very basic amines. Reaction yields with higher aldehydes were lower. Unique carboxylic–phosphinic–phosphonic acids as well as poly(H-phosphinic acids) derived from polyamines were obtained. Synthetic usefulness of the aminoalkyl-H-phosphinic was illustrated in P–H bond oxidation and its addition to double bonds, and in selective amine deprotection. Compounds with an ethylene-diamine fragment, e.g. most common polyazamacrocycles, are not suitable substrates. The X-ray solid-state structures of seventeen aminoalkyl-phosphinic acids were determined. In the reaction mechanism, N-hydroxyalkyl species R2NCH2OH and [R2N(CH2OH)2]+, probably stabilized as acetate esters, are suggested as the reactive intermediates. This mechanism is an alternative one to the known phospha-Mannich reaction mechanisms. The conditions can be utilized in syntheses of various aminoalkylphosphorus compounds. Acetic acid was used as a new solvent for phospha-Mannich reaction leading to clear reaction mixtures and high yields of the aminoalkylphosphonous acids (AHPA), and hydroxymethylated species were suggested as key intermediates in the reaction.![]()
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Affiliation(s)
- Peter Urbanovský
- Department of Inorganic Chemistry, Faculty of Science, Universita Karlova (Charles University) Hlavova 8/2030, 12843 Prague 2 Czech Republic +420-22195-1253 +420-22195-1263
| | - Jan Kotek
- Department of Inorganic Chemistry, Faculty of Science, Universita Karlova (Charles University) Hlavova 8/2030, 12843 Prague 2 Czech Republic +420-22195-1253 +420-22195-1263
| | - Ivana Císařová
- Department of Inorganic Chemistry, Faculty of Science, Universita Karlova (Charles University) Hlavova 8/2030, 12843 Prague 2 Czech Republic +420-22195-1253 +420-22195-1263
| | - Petr Hermann
- Department of Inorganic Chemistry, Faculty of Science, Universita Karlova (Charles University) Hlavova 8/2030, 12843 Prague 2 Czech Republic +420-22195-1253 +420-22195-1263
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18
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Urbanovský P, Kotek J, Císařová I, Hermann P. The solid-state structures and ligand cavity evaluation of lanthanide(iii) complexes of a DOTA analogue with a (dibenzylamino)methylphosphinate pendant arm. Dalton Trans 2020; 49:1555-1569. [PMID: 31932828 DOI: 10.1039/c9dt04056k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A series of lanthanide(iii) complexes of a monophosphinate analogue of H4dota, 1,4,7,10-tetraazacyclododecane-1,4,7-triacetic-10-methyl[(N,N-dibenzylamino)methyl]phosphinic acid (H4do3apDBAm = H4L1), were prepared and their solid-state structures were studied using single-crystal X-ray diffraction. In all structures, the ligand anion was octadentately coordinated to the Ln(iii) or Sc(iii) ions similarly to other DOTA-like ligands, i.e. forming parallel N4- and O4-planes. The lighter lanthanide(iii) complexes (till dysprosium) were nonacoordinated in the twisted square-antiprismatic (TSA) configuration with the apical coordination of water molecules or oxygen atoms from the neighbouring complex unit. The heavier lanthanide(iii) complexes (from terbium) were found as the "anhydrous" octacoordinated twisted square-antiprismatic (TSA') isomer. For the terbium(iii) ion, both forms were structurally characterized. The structural data of the Ln(iii)-H4L1 complexes and complexes of several related DOTA-like ligands were analysed. It clearly showed that the structural parameters for the square-antiprismatic (SA) isomers were clustered in a small range while those for the TSA/TSA' isomers were significantly more spread. The analysis also gave useful information about the influence of various pendant arms on the structure of the complexes of the DOTA-like ligands. The twist angle (torsion) of the chelate ring containing a larger phosphorus atom was similar to those of the remaining three acetate pendants. It led to a larger separation of the N4O4 planes and to smaller trans-O-Ln-O angles than the parameters found in the complexes of H4dota and its tetraamide derivatives dotam(R). It resulted in a relatively long bond between the metal ion and the coordinated water molecule. It led, together with the negative charge of the oxygen atoms forming the O4-plane, to an extremely fast water exchange rate reported for the Gd(iii)-H4L1 complex and, generally, to a fast water exchange of Gd(iii) complexes with the monophosphorus acid analogues of H4dota, H5do3ap/H4do3apR.
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Affiliation(s)
- Peter Urbanovský
- Universita Karlova (Charles University), Department of Inorganic Chemistry, Hlavova 2030, 128 43 Prague 2, Czech Republic.
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Hacaperková E, Jaroš A, Kotek J, Notni J, Straka M, Kubíček V, Hermann P. Al( iii)-NTA-fluoride: a simple model system for Al–F binding with interesting thermodynamics. Dalton Trans 2020; 49:13726-13736. [DOI: 10.1039/d0dt02644a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unsaturated AlIII complex shows a fast exchange of water molecules, hydroxide and fluoride anions in the coordination sphere, highly pH-dependent fluoride binding and release of fluorides at high pH or at high phosphate anion concentrations.
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Affiliation(s)
- Eliška Hacaperková
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague
- Czech Republic
| | - Adam Jaroš
- Institute of Organic Chemistry and Biochemistry
- AS CR
- 166 10 Prague
- Czech Republic
| | - Jan Kotek
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague
- Czech Republic
| | - Johannes Notni
- Institut für Pathologie und Pathologische Anatomie
- Technische Universität München
- 81675 München
- Germany
| | - Michal Straka
- Institute of Organic Chemistry and Biochemistry
- AS CR
- 166 10 Prague
- Czech Republic
| | - Vojtěch Kubíček
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague
- Czech Republic
| | - Petr Hermann
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague
- Czech Republic
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Joós-Kovács G, Vecsei B, Körmendi S, Gyarmathy VA, Borbély J, Hermann P. Trueness of CAD/CAM digitization with a desktop scanner - an in vitro study. BMC Oral Health 2019; 19:280. [PMID: 31830970 PMCID: PMC6909471 DOI: 10.1186/s12903-019-0976-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Accepted: 11/28/2019] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND Desktop scanners are devices for digitization of conventional impressions or gypsum casts by indirect Computer-Aided Design/Computer-Assisted Manufacturing (CAD/CAM) in dentistry. The purpose of this in vitro study was: 1, to investigate whether virtual models produced by the extraoral scanner have the same trueness as sectioned casts; and 2, to assess if digitization with an extraoral scanner influences the surface information. METHODS A polimethyl-methacrilic acid (PMMA) cast and a reference scanner (TwoCam 3D, SCAN technology A/S, Ringsted, Denmark; field of view 200 mm, resolution 0.1 mm ± 0.025 mm) were used to create the reference data in standard tessellation format (STL). According to the extraoral CAD/CAM digitization steps, impressions, mastercasts, and sectioned casts were made, and STL files were generated with the reference scanner. The pivotal point of the study was to digitalize these sectioned casts with the extraoral scanner (Straumann CARES Scan CS2 Visual 8.0 software, InstitutStraumann AG, Basel, Switzerland) and STL files were exported. Virtual caliper measurements were performed. Absolute deviations were compared using multilevel mixed-effects linear regression. Relative distortions were calculated with mean absolute errors and reference values. RESULTS Differences were observed in measurements of tooth sizes. All four prepared teeth were affected. No relationship was observed in relative deviations. Absolute differences between all the indirect digitization steps considering arch distances were: impressions, - 0.004 mm; mastercasts, 0.136 mm; sectioned casts, - 0.028 mm; and extraoral scanner, - 0.089 mm. Prepared dies on the virtual casts (extraoral scanner) were closer to each other than those on the sectioned gypsum casts. Relative deviation calculations revealed no relationship with the position of the dies in the arch. CONCLUSION The trueness of the virtual models generated by the extraoral scanner system used in this study was different from the dimensions of the sectioned casts. The digitization of gypsum casts changes both the dimensions of dies and the distances between the dies. The virtual casts had smaller distances than any distances measured at previous steps. Either bigger dies or longer distances did not result in greater distortions. We cannot, however, generalize our results to all scanners available on the market, because they might give different results.
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Affiliation(s)
- G. Joós-Kovács
- Department of Prosthodontics, Semmelweis University, Szentkirályi u. 47, Budapest, 1088 Hungary
| | - B. Vecsei
- Department of Prosthodontics, Semmelweis University, Szentkirályi u. 47, Budapest, 1088 Hungary
| | - Sz. Körmendi
- Department of Prosthodontics, Semmelweis University, Szentkirályi u. 47, Budapest, 1088 Hungary
| | - V. A. Gyarmathy
- EpiConsult LLC, 8 The Green, STE A, Dover, DE 19901 USA
- Johns Hopkins Bloomberg School of Public Health, Baltimore, MD USA
| | - J. Borbély
- Department of Prosthodontics, Semmelweis University, Szentkirályi u. 47, Budapest, 1088 Hungary
| | - P. Hermann
- Department of Prosthodontics, Semmelweis University, Szentkirályi u. 47, Budapest, 1088 Hungary
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Mantalos P, Karagrigoriou A, Střelec L, Jordanova P, Hermann P, Kiseľák J, Hudák J, Stehlík M. On improved volatility modelling by fitting skewness in ARCH models. J Appl Stat 2019; 47:1031-1063. [DOI: 10.1080/02664763.2019.1671323] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- P. Mantalos
- Department of Economics and Statistics, Linnaeus University, Vaxjo, Sweden
| | - A. Karagrigoriou
- Department of Statistics & Actuarial Financial Mathematics, University of the Aegean, Samos, Greece
| | - L. Střelec
- Department of Statistics and Operation Analysis, Mendel University, Brno, Czech Republic
| | - P. Jordanova
- Faculty of Mathematics and Informatics, Shumen University, Shumen, Bulgaria
| | - P. Hermann
- Department of Applied Statistics, Johannes Kepler University, Linz, Austria
| | - J. Kiseľák
- Department of Applied Statistics, Johannes Kepler University, Linz, Austria
- LIT – Linz Institute of Technology, Johannes Kepler University, Linz, Austria
- Institute of Mathematics, Faculty of Science, P. J. Šafárik University in Košice, Kosice, Slovakia
| | - J. Hudák
- Institute of Mathematics, Faculty of Science, P. J. Šafárik University in Košice, Kosice, Slovakia
| | - M. Stehlík
- Department of Applied Statistics, Johannes Kepler University, Linz, Austria
- LIT – Linz Institute of Technology, Johannes Kepler University, Linz, Austria
- Department of Statistics, University of Valparaíso, Valparaíso, Chile
- Statistics & Actuarial Science Department, The University of Iowa, IA, USA
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Bárta J, Hermann P, Kotek J. Coordination Behavior of 1,4-Disubstituted Cyclen Endowed with Phosphonate, Phosphonate Monoethylester, and H-Phosphinate Pendant Arms. Molecules 2019; 24:E3324. [PMID: 31547345 PMCID: PMC6767212 DOI: 10.3390/molecules24183324] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 09/06/2019] [Accepted: 09/08/2019] [Indexed: 11/17/2022] Open
Abstract
Three 1,4,7,10-tetraazacyclododecane-based ligands disubstituted in 1,4-positions with phosphonic acid, phosphonate monoethyl-ester, and H-phosphinic acid pendant arms, 1,4-H4do2p, 1,4-H2do2pOEt, and 1,4-H2Bn2do2pH, were synthesized and their coordination to selected metal ions, Mg(II), Ca(II), Mn(II), Zn(II), Cu(II), Eu(III), Gd(III), and Tb(III), was investigated. The solid-state structure of the phosphonate ligand, 1,4-H4do2p, was determined by single-crystal X-ray diffraction. Protonation constants of the ligands and stability constants of their complexes were obtained by potentiometry, and their values are comparable to those of previously studied analogous 1,7-disubstitued cyclen derivatives. The Gd(III) complex of 1,4-H4do2p is ~1 order of magnitude more stable than the Gd(III) complex of the 1,7-analogue, probably due to the disubstituted ethylenediamine-like structural motif in 1,4-H4do2p enabling more efficient wrapping of the metal ion. Stability of Gd(III)-1,4-H2do2pOEt and Gd(III)-H2Bn2do2pH complexes is low and the constants cannot be determined due to precipitation of the metal hydroxide. Protonations of the Cu(II), Zn(II), and Gd(III) complexes probably takes place on the coordinated phosphonate groups. Complexes of Mn(II) and alkali-earth metal ions are significantly less stable and are not formed in acidic solutions. Potential presence of water molecule(s) in the coordination spheres of the Mn(II) and Ln(III) complexes was studied by variable-temperature NMR experiments. The Mn(II) complexes of the ligands are not hydrated. The Gd(III)-1,4-H4do2p complex undergoes hydration equilibrium between mono- and bis-hydrated species. Presence of two-species equilibrium was confirmed by UV-Vis spectroscopy of the Eu(III)-1,4-H4do2p complex and hydration states were also determined by luminescence measurements of the Eu(III)/Tb(III)-1,4-H4do2p complexes.
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Affiliation(s)
- Jiří Bárta
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43 Prague 2, Czech Republic.
| | - Petr Hermann
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43 Prague 2, Czech Republic.
| | - Jan Kotek
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43 Prague 2, Czech Republic.
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Llorens F, Villar-Piqué A, Schmitz M, Diaz-Lucena D, Wohlhage M, Hermann P, Goebel S, Schmidt I, Glatzel M, Hauw JJ, Sikorska B, Liberski PP, Riggert J, Ferrer I, Zerr I. Plasma total prion protein as a potential biomarker for neurodegenerative dementia: diagnostic accuracy in the spectrum of prion diseases. Neuropathol Appl Neurobiol 2019; 46:240-254. [PMID: 31216593 DOI: 10.1111/nan.12573] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 06/12/2019] [Indexed: 12/11/2022]
Abstract
AIMS In the search for blood-based biomarkers of neurodegenerative diseases, we characterized the concentration of total prion protein (t-PrP) in the plasma of neurodegenerative dementias. We aimed to assess its accuracy in this differential diagnostic context. METHODS Plasma t-PrP was measured in 520 individuals including healthy controls (HC) and patients diagnosed with neurological disease control (ND), Alzheimer's disease (AD), sporadic Creutzfeldt-Jakob disease (sCJD), frontotemporal dementia (FTD), Lewy body dementia (LBD) and vascular dementia (VaD). Additionally, t-PrP was quantified in genetic prion diseases and iatrogenic CJD. The accuracy of t-PrP discriminating the diagnostic groups was evaluated and correlated with demographic, genetic and clinical data in prion diseases. Markers of blood-brain barrier impairment were investigated in sCJD brains. RESULTS Compared to HC and ND, elevated plasma t-PrP concentrations were detected in sCJD, followed by FTD, AD, VaD and LBD. In sCJD, t-PrP was associated neither with age nor sex, but with codon 129 PRNP genotype. Plasma t-PrP concentrations correlated with cerebrospinal fluid (CSF) markers of neuro-axonal damage, but not with CSF t-PrP. In genetic prion diseases, plasma t-PrP was elevated in all type of mutations investigated. In sCJD brain tissue, extravasation of immunoglobulin G and the presence of swollen astrocytic end-feet around the vessels suggested leakage of blood-brain barrier as a potential source of increased plasma t-PrP. CONCLUSIONS Plasma t-PrP is elevated in prion diseases regardless of aetiology. This pilot study opens the possibility to consider plasma t-PrP as a promising blood-based biomarker in the diagnostic of prion disease.
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Affiliation(s)
- F Llorens
- Network Center for Biomedical Research in Neurodegenerative Diseases, (CIBERNED), Institute Carlos III, Ministry of Health, Hospitalet de Llobregat, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Spain.,Department of Neurology, University Medical School, Göttingen, Germany
| | - A Villar-Piqué
- Department of Neurology, University Medical School, Göttingen, Germany
| | - M Schmitz
- Department of Neurology, University Medical School, Göttingen, Germany.,German Center for Neurodegenerative Diseases (DZNE), Göttingen, Germany
| | - D Diaz-Lucena
- Network Center for Biomedical Research in Neurodegenerative Diseases, (CIBERNED), Institute Carlos III, Ministry of Health, Hospitalet de Llobregat, Spain
| | - M Wohlhage
- Department of Neurology, University Medical School, Göttingen, Germany
| | - P Hermann
- Department of Neurology, University Medical School, Göttingen, Germany
| | - S Goebel
- Department of Neurology, University Medical School, Göttingen, Germany
| | - I Schmidt
- Department of Neurology, University Medical School, Göttingen, Germany
| | - M Glatzel
- Institute of Neuropathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - J-J Hauw
- Centre national de référence des ATNC, Paris, France
| | - B Sikorska
- Department of Molecular Pathology and Neuropathology, Medical University of Lodz, Lodz, Poland
| | - P P Liberski
- Department of Molecular Pathology and Neuropathology, Medical University of Lodz, Lodz, Poland
| | - J Riggert
- Department of Transfusion Medicine, University Medical School, Göttingen, Germany
| | - I Ferrer
- Network Center for Biomedical Research in Neurodegenerative Diseases, (CIBERNED), Institute Carlos III, Ministry of Health, Hospitalet de Llobregat, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Spain.,Department of Pathology and Experimental Therapeutics, Faculty of Medicine, University of Barcelona, Barcelona, Spain
| | - I Zerr
- Department of Neurology, University Medical School, Göttingen, Germany.,German Center for Neurodegenerative Diseases (DZNE), Göttingen, Germany
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Kubicek V, David T, Lubal P, Pietzsch HJ, Hermann P. Cross-bridged cyclams with bis (phosphinic acid) pendants for a fast Cu(II) complexation: towards efficient 64Cu labeling. Nucl Med Biol 2019. [DOI: 10.1016/s0969-8051(19)30219-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Urbanovský P, Kotek J, Carniato F, Botta M, Hermann P. Lanthanide Complexes of DO3A-(Dibenzylamino)methylphosphinate: Effect of Protonation of the Dibenzylamino Group on the Water-Exchange Rate and the Binding of Human Serum Albumin. Inorg Chem 2019; 58:5196-5210. [PMID: 30942072 DOI: 10.1021/acs.inorgchem.9b00267] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Protonation of a distant, noncoordinated group of metal-based magnetic resonance imaging contrast agents potentially changes their relaxivity. The effect of a positive charge of the drug on the human serum albumin (HSA)-drug interaction remains poorly understood as well. Accordingly, a (dibenzylamino)methylphosphinate derivative of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) was efficiently synthesized using pyridine as the solvent for a Mannich-type reaction of tBu3DO3A, formaldehyde, and Bn2NCH2PO2H2 ethyl ester. The ligand protonation and metal ion (Gd3+, Cu2+, and Zn2+) stability constants were similar to those of the parent DOTA, whereas the basicity of the side-chain amino group of the complexes (log KA = 5.8) was 1 order of magnitude lower than that of the free ligand (log KA = 6.8). The presence of one bound water molecule in both deprotonated and protonated forms of the gadolinium(III) complex was deduced from the solid-state X-ray diffraction data [gadolinium(III) and dysprosium(III)], from the square antiprism/twisted square antiprism (SA/TSA) isomer ratio along the lanthanide series, from the fluorescence data of the europium(III) complex, and from the 17O NMR measurements of the dysprosium(III) and gadolinium(III) complexes. In the gadolinium(III) complex with the deprotonated amino group, water exchange is extremely fast (τM = 6 ns at 25 °C), most likely thanks to the high abundance of the TSA isomer and to the presence of a proximate protonable group, which assists the water-exchange process. The interaction between lanthanide(III) complexes and HSA is pH-dependent, and the deprotonated form is bound much more efficaciously (∼13% and ∼70% bound complex at pH = 4 and 7, respectively). The relaxivities of the complex and its HSA adduct are also pH-dependent, and the latter is approximately 2-3 times increased at pH = 4-7. The relaxivity for the supramolecular HSA-complex adduct ( r1b) is as high as 52 mM-1 s-1 at neutral pH (at 20 MHz and 25 °C). The findings of this study stand as a proof-of-concept, showing the ability to manipulate an albumin-drug interaction, and thus the blood pool residence time of the drug, by introducing a positive charge in a side-chain amino group.
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Affiliation(s)
- Peter Urbanovský
- Department of Inorganic Chemistry , Universita Karlova (Charles University) , Hlavova 2030 , 12843 Prague 2 , Czech Republic
| | - Jan Kotek
- Department of Inorganic Chemistry , Universita Karlova (Charles University) , Hlavova 2030 , 12843 Prague 2 , Czech Republic
| | - Fabio Carniato
- Dipartimento di Scienze e Innovazione Tecnologica , Università del Piemonte Orientale "A. Avogadro" , Viale T. Michel 11 , 15121 Alessandria , Italy
| | - Mauro Botta
- Dipartimento di Scienze e Innovazione Tecnologica , Università del Piemonte Orientale "A. Avogadro" , Viale T. Michel 11 , 15121 Alessandria , Italy
| | - Petr Hermann
- Department of Inorganic Chemistry , Universita Karlova (Charles University) , Hlavova 2030 , 12843 Prague 2 , Czech Republic
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26
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Herynek V, Martinisková M, Bobrova Y, Gálisová A, Kotek J, Hermann P, Koucký F, Jirák D, Hájek M. Low-molecular-weight paramagnetic 19F contrast agents for fluorine magnetic resonance imaging. MAGMA 2018; 32:115-122. [PMID: 30498883 PMCID: PMC6514088 DOI: 10.1007/s10334-018-0721-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 11/20/2018] [Accepted: 11/21/2018] [Indexed: 12/24/2022]
Abstract
Objective 19F MRI requires biocompatible and non-toxic soluble contrast agents with high fluorine content and with suitable 19F relaxation times. Probes based on a DOTP chelate with 12 magnetically equivalent fluorine atoms (DOTP-tfe) and a lanthanide(III) ion shortening the relaxation times were prepared and tested. Methods Complexes of DOTP-tfe with trivalent paramagnetic Ce, Dy, Ho, Tm, and Yb ions were synthetized and characterized. 19F relaxation times were determined and compared to those of the La complex and of the empty ligand. In vitro and in vivo 19F MRI was performed at 4.7 T. Results 19F relaxation times strongly depended on the chelated lanthanide(III) ion. T1 ranged from 6.5 to 287 ms, T2 from 3.9 to 124.4 ms, and T2* from 1.1 to 3.1 ms. All complexes in combination with optimized sequences provided sufficient signal in vitro under conditions mimicking experiments in vivo (concentrations 1.25 mM, 15-min scanning time). As a proof of concept, two contrast agents were injected into the rat muscle; 19F MRI in vivo confirmed the in vivo applicability of the probe. Conclusion DOTP-based 19F probes showed suitable properties for in vitro and in vivo visualization and biological applications. The lanthanide(III) ions enabled us to shorten the relaxation times and to trim the probes according to the actual needs. Similar to the clinically approved Gd3+ chelates, this customized probe design ensures consistent biochemical properties and similar safety profiles.
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Affiliation(s)
- Vít Herynek
- Center for Advanced Preclinical Imaging, First Faculty of Medicine, Charles University, Salmovská 3, Prague, Czech Republic.
- MR-Unit, Department of Diagnostic and Interventional Radiology, Institute for Clinical and Experimental Medicine, Vídeňská 1958/9, Prague, Czech Republic.
| | - Marie Martinisková
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 12843, Prague 2, Czech Republic
| | - Yulia Bobrova
- Department of Low Temperature Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Prague, Czech Republic
| | - Andrea Gálisová
- MR-Unit, Department of Diagnostic and Interventional Radiology, Institute for Clinical and Experimental Medicine, Vídeňská 1958/9, Prague, Czech Republic
| | - Jan Kotek
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 12843, Prague 2, Czech Republic
| | - Petr Hermann
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 12843, Prague 2, Czech Republic
| | - Filip Koucký
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 12843, Prague 2, Czech Republic
| | - Daniel Jirák
- MR-Unit, Department of Diagnostic and Interventional Radiology, Institute for Clinical and Experimental Medicine, Vídeňská 1958/9, Prague, Czech Republic
| | - Milan Hájek
- MR-Unit, Department of Diagnostic and Interventional Radiology, Institute for Clinical and Experimental Medicine, Vídeňská 1958/9, Prague, Czech Republic
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David T, Hlinová V, Kubíček V, Bergmann R, Striese F, Berndt N, Szöllősi D, Kovács T, Máthé D, Bachmann M, Pietzsch HJ, Hermann P. Improved Conjugation, 64-Cu Radiolabeling, in Vivo Stability, and Imaging Using Nonprotected Bifunctional Macrocyclic Ligands: Bis(Phosphinate) Cyclam (BPC) Chelators. J Med Chem 2018; 61:8774-8796. [PMID: 30180567 DOI: 10.1021/acs.jmedchem.8b00932] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Bifunctional derivatives of bis(phosphinate)-bearing cyclam (BPC) chelators bearing a carboxylate, amine, isothiocyanate, azide, or cyclooctyne in the BP side chain were synthesized. Conjugations required no protection of phosphinate or ring secondary amine groups. The ring amines were not reactive (proton protected) at pH < ∼8. For isothiocyanate coupling, oligopeptide N-terminal α-amines were more suitable than alkyl amines, e.g., Lys ω-amine (p Ka ∼7.5-8.5 and ∼10-11, respectively) due to lower basicity. The Cu-64 labeling was efficient at room temperature (specific activity ∼100 GBq/μmol; 25 °C, pH 6.2, ∼100 ligand equiv, 10 min). A representative Cu-64-BPC was tested in vivo showing fast clearance and no nonspecific radioactivity deposition. The monoclonal anti-PSCA antibody 7F5 conjugates with thiocyanate BPC derivative or NODAGA were radiolabeled and studied in PC3-PSCA tumor bearing mice by PET. The radiolabeled BPC conjugate was accumulated in the prostate tumor with a low off-target uptake, unlike Cu-64-labeled NODAGA-antibody conjugate. The BPC chelators have a great potential for theranostic applications of the Cu-64/Cu-67 matched pair.
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Affiliation(s)
- Tomáš David
- Department of Inorganic Chemistry, Faculty of Science , Charles University , Hlavova 2030 , 128 40 Prague , Czech Republic.,Institute of Radiopharmaceutical Cancer Research , Helmholtz-Zentrum Dresden-Rossendorf , Bautzner Landstrasse 400 , 01328 Dresden , Germany
| | - Veronika Hlinová
- Department of Inorganic Chemistry, Faculty of Science , Charles University , Hlavova 2030 , 128 40 Prague , Czech Republic
| | - Vojtěch Kubíček
- Department of Inorganic Chemistry, Faculty of Science , Charles University , Hlavova 2030 , 128 40 Prague , Czech Republic
| | - Ralf Bergmann
- Institute of Radiopharmaceutical Cancer Research , Helmholtz-Zentrum Dresden-Rossendorf , Bautzner Landstrasse 400 , 01328 Dresden , Germany
| | - Franziska Striese
- Institute of Radiopharmaceutical Cancer Research , Helmholtz-Zentrum Dresden-Rossendorf , Bautzner Landstrasse 400 , 01328 Dresden , Germany
| | - Nicole Berndt
- Partner Site Dresden , German Cancer Consortium (DKTK) , Fetscherstrasse 74 , 01307 Dresden , Germany.,German Cancer Research Center (DKFZ) , Im Neuenheimer Feld 280 , 69120 Heidelberg , Germany
| | - Dávid Szöllősi
- Department of Biophysics and Radiation Biology , Semmelweis University , Tűzoltó utca 37-47 , H-1094 Budapest , Hungary
| | - Tibor Kovács
- Institute of Radiochemistry and Radioecology , University of Pannonia , Egyetem St. 10 , H-8200 Veszprém , Hungary.,Social Organization for Radioecological Cleanliness , P.O. Box 158, H-8200 Veszprém , Hungary
| | - Domokos Máthé
- Department of Biophysics and Radiation Biology , Semmelweis University , Tűzoltó utca 37-47 , H-1094 Budapest , Hungary
| | - Michael Bachmann
- Institute of Radiopharmaceutical Cancer Research , Helmholtz-Zentrum Dresden-Rossendorf , Bautzner Landstrasse 400 , 01328 Dresden , Germany.,Tumor Immunology, University Cancer Center (UCC) , "Carl Gustav Carus" Technische Universität Dresden , Fetscherstrasse 74 , 01307 Dresden , Germany.,National Center for Tumor Diseases (NCT) , "Carl Gustav Carus" Technische Universität Dresden , Fetscherstrasse 74 , 01307 Dresden , Germany
| | - Hans-Jürgen Pietzsch
- Institute of Radiopharmaceutical Cancer Research , Helmholtz-Zentrum Dresden-Rossendorf , Bautzner Landstrasse 400 , 01328 Dresden , Germany
| | - Petr Hermann
- Department of Inorganic Chemistry, Faculty of Science , Charles University , Hlavova 2030 , 128 40 Prague , Czech Republic
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Affiliation(s)
- Danuta Kruk
- Faculty of Mathematics and Computer Science, University of Warmia & Mazury in Olsztyn, Olsztyn, Poland
| | - Evrim Umut
- Faculty of Mathematics and Computer Science, University of Warmia & Mazury in Olsztyn, Olsztyn, Poland
| | - Elzbieta Masiewicz
- Faculty of Mathematics and Computer Science, University of Warmia & Mazury in Olsztyn, Olsztyn, Poland
| | - Petr Hermann
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Prague 2, Czech Republic
| | - Hermann Scharfetter
- Institute of Medical Engineering, Graz University of Technology, Graz, Austria
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29
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Šimeček J, Hermann P, Seidl C, Bruchertseifer F, Morgenstern A, Wester HJ, Notni J. Efficient formation of inert Bi-213 chelates by tetraphosphorus acid analogues of DOTA: towards improved alpha-therapeutics. EJNMMI Res 2018; 8:78. [PMID: 30091088 PMCID: PMC6082748 DOI: 10.1186/s13550-018-0431-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Accepted: 07/29/2018] [Indexed: 12/20/2022] Open
Abstract
Background The recently growing interest in targeted alpha-therapy (TAT) calls for improvement of the labelling chemistry of the corresponding radionuclides. 213BiIII is a short-lived alpha emitter which emits only one alpha particle in its decay chain. Hence, it might be safer in application than other respective nuclides, such as 223Ra or 225Ac, because no alpha-emitting daughters are released upon recoil. We investigated cyclen derivatives with phosphorus-containing pendant arms regarding their suitability for 213Bi labelling. Results The concentration dependency of 213Bi labelling at 25 °C and 95 °C was determined for DOTP, DOTPH, DOTPEt, and DOTPI, as well as for DOTA and CHX-A"-DTPA for comparison. The labelling efficiency of the phosphorus-containing ligands was at least comparable to CHX-A"-DTPA and exceeded that of DOTA. DOTP was most efficient, requiring chelator concentrations for labelling which were approx. two orders of magnitude lower than those required for CHX-A"-DTPA, both at 25 °C and 95 °C. The 213Bi complexes of phosphorus ligands furthermore showed a higher stability against demetallation (> 96% of intact complex after 120-min incubation in plasma were found for DOTP, DOTPH, and DOTPEt, compared to 85% for DOTA and 76% for CHX-A"-DTPA). Conclusion Cyclen derivatives bearing four N-methylenephosphonic or -phosphinic acid substituents, e.g., DOTP, are capable of complexing the alpha-emitting radionuclide 213BiIII with higher efficiency and in-vitro stability than the current gold standards DOTA and CHX-A"-DTPA.
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Affiliation(s)
- Jakub Šimeček
- Lehrstuhl für Pharmazeutische Radiochemie, Technische Universität München,, Walther-Meißner-Strasse 3, 85748, Garching, Germany.,Present address: Isotope Technologies Garching GmbH, Garching, Germany
| | - Petr Hermann
- Department of Inorganic Chemistry, Charles University, Hlavova 2030, 12843, Prague 2, Czech Republic
| | - Christof Seidl
- Department of Nuclear Medicine and Department of Obstetrics and Gynecology, Technische Universität München, Munich, Germany
| | - Frank Bruchertseifer
- European Commission, Joint Research Centre, Directorate for Nuclear Safety and Security, Karlsruhe, Germany
| | - Alfred Morgenstern
- European Commission, Joint Research Centre, Directorate for Nuclear Safety and Security, Karlsruhe, Germany
| | - Hans-Jürgen Wester
- Lehrstuhl für Pharmazeutische Radiochemie, Technische Universität München,, Walther-Meißner-Strasse 3, 85748, Garching, Germany
| | - Johannes Notni
- Lehrstuhl für Pharmazeutische Radiochemie, Technische Universität München,, Walther-Meißner-Strasse 3, 85748, Garching, Germany.
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30
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Dries M, Obermair M, Hettler S, Hermann P, Seemann K, Seifried F, Ulrich S, Fischer R, Gerthsen D. Oxide-free aC/Zr 0.65Al 0.075Cu 0.275/aC phase plates for transmission electron microscopy. Ultramicroscopy 2018; 189:39-45. [PMID: 29604501 DOI: 10.1016/j.ultramic.2018.03.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 02/22/2018] [Accepted: 03/02/2018] [Indexed: 11/28/2022]
Abstract
Thin-film phase plates (PP) have become a valuable tool for the imaging of organic objects in transmission electron microscopy (TEM). The thin film usually consists of amorphous carbon (aC), which undergoes rapid aging under intense illumination with high-energy electrons. The limited lifetime of aC film PPs calls for alternative PP materials with improved material stability. This work presents thin-film PPs fabricated from the metallic glass alloy Zr0.65Al0.075Cu0.275 (ZAC), which was identified as a promising PP material with beneficial properties, such as a large inelastic mean free path. An adverse effect of the ZAC alloy is the formation of a surface oxide layer in ambient air, which reduces the electrical conductivity and causes electrostatic charging in the electron beam. To avoid surface oxidation, the ZAC alloy is enclosed by thin aC layers. The resulting aC/ZAC/aC layer system is used to fabricate Zernike and Hilbert PPs. Phase-contrast TEM imaging is demonstrated for a sample of carbon nanotubes, which show strong contrast enhancement in PP TEM images.
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Affiliation(s)
- M Dries
- Karlsruher Institut für Technologie (KIT), Laboratorium für Elektronenmikroskopie (LEM), Engesserstraße 7, D-76131, Karlsruhe, Germany
| | - M Obermair
- Karlsruher Institut für Technologie (KIT), Laboratorium für Elektronenmikroskopie (LEM), Engesserstraße 7, D-76131, Karlsruhe, Germany.
| | - S Hettler
- Karlsruher Institut für Technologie (KIT), Laboratorium für Elektronenmikroskopie (LEM), Engesserstraße 7, D-76131, Karlsruhe, Germany
| | - P Hermann
- Karlsruher Institut für Technologie (KIT), Laboratorium für Elektronenmikroskopie (LEM), Engesserstraße 7, D-76131, Karlsruhe, Germany
| | - K Seemann
- Karlsruher Institut für Technologie (KIT), Institut für Angewandte Materialien (IAM), Hermann-von-Helmholtz-Platz 1, D-76344, Eggenstein-Leopoldshafen, Germany
| | - F Seifried
- Karlsruher Institut für Technologie (KIT), Institut für Angewandte Materialien (IAM), Hermann-von-Helmholtz-Platz 1, D-76344, Eggenstein-Leopoldshafen, Germany
| | - S Ulrich
- Karlsruher Institut für Technologie (KIT), Institut für Angewandte Materialien (IAM), Hermann-von-Helmholtz-Platz 1, D-76344, Eggenstein-Leopoldshafen, Germany
| | - R Fischer
- Karlsruher Institut für Technologie (KIT), Institut für Physikalische Chemie (IPC), Fritz-Haber-Weg 2, D-76131, Karlsruhe, Germany
| | - D Gerthsen
- Karlsruher Institut für Technologie (KIT), Laboratorium für Elektronenmikroskopie (LEM), Engesserstraße 7, D-76131, Karlsruhe, Germany
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Kubíček V, Böhmová Z, Ševčíková R, Vaněk J, Lubal P, Poláková Z, Michalicová R, Kotek J, Hermann P. NOTA Complexes with Copper(II) and Divalent Metal Ions: Kinetic and Thermodynamic Studies. Inorg Chem 2018; 57:3061-3072. [PMID: 29488748 DOI: 10.1021/acs.inorgchem.7b02929] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
H3nota derivatives are among the most studied macrocyclic ligands and are widely used for metal ion binding in biology and medicine. Despite more than 40 years of chemical research on H3nota, the comprehensive study of its solution chemistry has been overlooked. Thus, the coordination behavior of H3nota with several divalent metal ions was studied in detail with respect to its application as a chelator for copper radioisotopes in medical imaging and therapy. In the solid-state structure of the free ligand in zwitterionic form, one proton is bound in the macrocyclic cavity through a strong intramolecular hydrogen-bond system supporting the high basicity of the ring amine groups (log Ka = 13.17). The high stability of the [Cu(nota)]- complex (log KML = 23.33) results in quantitative complex formation, even at pH <1.5. The ligand is moderately selective for Cu(II) over other metal ions (e.g., log KML(Zn) = 22.32 and log KML(Ni) = 19.24). This ligand forms a more stable complex with Mg(II) than with Ca(II) and forms surprisingly stable complexes with alkali-metal ions (stability order Li(I) > Na(I) > K(I)). Thus, H3nota shows high selectivity for small metal ions. The [Cu(nota)]- complex is hexacoordinated at neutral pH, and the equatorial N2O2 interaction is strengthened by complex protonation. Detailed kinetic studies showed that the Cu(II) complex is formed quickly (millisecond time scale at cCu ≈ 0.1 mM) through an out-of-cage intermediate. Conversely, conductivity measurements revealed that the Zn(II) complex is formed much more slowly than the Cu(II) complex. The Cu(II) complex has medium kinetic inertness (τ1/2 46 s; pH 0, 25 °C) and is less resistant to acid-assisted decomplexation than Cu(II) complexes with H4dota and H4teta. Surprisingly, [Cu(nota)]- decomplexation is decelerated in the presence of Zn(II) ions due to the formation of a stable dinuclear complex. In conclusion, H3nota is a good carrier of copper radionuclides because the [Cu(nota)]- complex is predominantly formed over complexes with common impurities in radiochemical formulations, Zn(II) and Ni(II), for thermodynamic and, primarily, for kinetic reasons. Furthermore, the in vivo stability of the [Cu(nota)]- complex may be increased due to the formation of dinuclear complexes when it interacts with biometals.
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Affiliation(s)
- Vojtěch Kubíček
- Department of Inorganic Chemistry, Faculty of Science , Charles University , Hlavova 8 , 128 40 Prague 2 , Czech Republic
| | - Zuzana Böhmová
- Department of Inorganic Chemistry, Faculty of Science , Charles University , Hlavova 8 , 128 40 Prague 2 , Czech Republic
| | - Romana Ševčíková
- Department of Chemistry , Masaryk University , Kotlářská 2 , 611 37 Brno , Czech Republic
| | - Jakub Vaněk
- Department of Chemistry , Masaryk University , Kotlářská 2 , 611 37 Brno , Czech Republic.,Central European Institute of Technology (CEITEC) , Masaryk University , Kamenice 5 , 625 00 Brno , Czech Republic
| | - Přemysl Lubal
- Department of Chemistry , Masaryk University , Kotlářská 2 , 611 37 Brno , Czech Republic.,Central European Institute of Technology (CEITEC) , Masaryk University , Kamenice 5 , 625 00 Brno , Czech Republic
| | - Zuzana Poláková
- Department of Inorganic Chemistry, Faculty of Science , Charles University , Hlavova 8 , 128 40 Prague 2 , Czech Republic
| | - Romana Michalicová
- Department of Chemistry , Masaryk University , Kotlářská 2 , 611 37 Brno , Czech Republic
| | - Jan Kotek
- Department of Inorganic Chemistry, Faculty of Science , Charles University , Hlavova 8 , 128 40 Prague 2 , Czech Republic
| | - Petr Hermann
- Department of Inorganic Chemistry, Faculty of Science , Charles University , Hlavova 8 , 128 40 Prague 2 , Czech Republic
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Ševčík R, Vaněk J, Michalicová R, Lubal P, Hermann P, Santos IC, Santos I, Campello MPC. Formation and decomplexation kinetics of copper(ii) complexes with cyclen derivatives having mixed carboxylate and phosphonate pendant arms. Dalton Trans 2018; 45:12723-33. [PMID: 27460053 DOI: 10.1039/c6dt01127f] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The kinetic properties of Cu(ii) complexes of H4dota and its analogues with one (H5do3ap), two in the 1,7-position (trans-H6do2a2p), three (H7doa3p) and four (H8dotp) phosphonic acid pendant arms were investigated. The formation of a Cu(ii) complex with H4dota, trans-H6do2a2p and H8dotp at a slightly acidic pH is faster for the phosphonic acid derivatives than for H4dota, but with no simple dependence on the number of -CH2PO3H2 substituents (trans-H6do2a2p > H8dotp > H4dota; pH 4-6). Relative differences in the reactivity among the differently protonated species (HnL(x-)) of the same ligand are successively decreased with the more phosphonic acid groups in the ligand. The faster complexation is probably caused by the higher ability of phosphonates to bind the metal ion and/or to assist in the transfer of protons from the ring amine groups to the bulk water. The acid-assisted decomplexation kinetics of the complexes was followed in highly acidic solutions ([H(+)] = 0.01-5 M) and at different temperatures (15-70 °C) to determine the activation parameters of the reaction. The kinetic inertness of the Cu(ii) complexes follows the order: H4dota > H5do3ap > trans-H6do2a2p > H7doa3p > H8dotp. To obtain information on the influence of additional pendant arms, analogous data were obtained for trans-H2do2a. The ligand is less reactive than H4dota, but the kinetic inertness of its Cu(ii) complex is similar to that of the H4dota complex. As it was considered that the published thermodynamics data on the Cu(ii)-H8dotp system are probably incorrect, the system was re-investigated. It showed a very high stability for the [Cu(dotp)](6-) species and the easy formation of several Cu2L species in the presence of an excess of the metal ion. Also, the structure of the (H6doa3p)(-) anion in the solid state was determined. These experimental data demonstrate that the substitution of acetic acid pendant arms by methylphosphonic acid ones in H4dota-like ligands increases the rate of complexation but significantly decreases the kinetic inertness of the Cu(ii) complexes.
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Affiliation(s)
- R Ševčík
- Department of Chemistry, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic.
| | - J Vaněk
- Department of Chemistry, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic. and Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - R Michalicová
- Department of Chemistry, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic.
| | - P Lubal
- Department of Chemistry, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic. and Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - P Hermann
- Department of Inorganic Chemistry, Faculty of Science, Universita Karlova (Charles University), Hlavova 2030, 128 40 Prague 2, Czech Republic
| | - I C Santos
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, 2695-066 Bobadela LRS, Portugal.
| | - I Santos
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, 2695-066 Bobadela LRS, Portugal.
| | - M P C Campello
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, 2695-066 Bobadela LRS, Portugal.
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Procházková S, Kubíček V, Kotek J, Vágner A, Notni J, Hermann P. Lanthanide(iii) complexes of monophosphinate/monophosphonate DOTA-analogues: effects of the substituents on the formation rate and radiolabelling yield. Dalton Trans 2018; 47:13006-13015. [DOI: 10.1039/c8dt02608d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly acidic additional coordinating groups in the pendant arms increase the radiolabelling yield of DOTA-like complexes.
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Affiliation(s)
- Soňa Procházková
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Czech Republic
| | - Vojtěch Kubíček
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Czech Republic
| | - Jan Kotek
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Czech Republic
| | - Adrienn Vágner
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- Debrecen
- Hungary
| | - Johannes Notni
- Lehrstuhl für Pharmazeutische Radiochemie
- Technische Universität München
- D-85748 Garching
- Germany
| | - Petr Hermann
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Czech Republic
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Hlinová V, Jaroš A, David T, Císařová I, Kotek J, Kubíček V, Hermann P. Complexes of phosphonate and phosphinate derivatives of dipicolylamine. NEW J CHEM 2018. [DOI: 10.1039/c8nj00100f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Phospho(i)nate derivatives of dipicolylamine show excellent selectivity for Zn(ii) over alkaline earth metal ions.
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Affiliation(s)
- Veronika Hlinová
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague
- Czech Republic
| | - Adam Jaroš
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague
- Czech Republic
| | - Tomáš David
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague
- Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague
- Czech Republic
| | - Jan Kotek
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague
- Czech Republic
| | - Vojtěch Kubíček
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague
- Czech Republic
| | - Petr Hermann
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague
- Czech Republic
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35
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Paúrová M, David T, Císařová I, Lubal P, Hermann P, Kotek J. Optimization of the selectivity and rate of copper radioisotope complexation: formation and dissociation kinetic studies of 1,4,8-trimethylcyclam-based ligands with different coordinating pendant arms. NEW J CHEM 2018. [DOI: 10.1039/c8nj00419f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Influence of coordinating pendant arm character on selectivity and rate of copper(ii) complexation was investigated to optimize ligands for radiomedicinal use.
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Affiliation(s)
- Monika Paúrová
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Czech Republic
| | - Tomáš David
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Czech Republic
| | - Přemysl Lubal
- Department of Chemistry
- Faculty of Science
- Masaryk University
- Brno
- Czech Republic
| | - Petr Hermann
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Czech Republic
| | - Jan Kotek
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Czech Republic
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Blahut J, Bernášek K, Gálisová A, Herynek V, Císařová I, Kotek J, Lang J, Matějková S, Hermann P. Paramagnetic 19F Relaxation Enhancement in Nickel(II) Complexes of N-Trifluoroethyl Cyclam Derivatives and Cell Labeling for 19F MRI. Inorg Chem 2017; 56:13337-13348. [DOI: 10.1021/acs.inorgchem.7b02119] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Jan Blahut
- Department of Inorganic
Chemistry, Faculty of Science, Charles University (Univerzita Karlova), Hlavova 2030, 128 43 Prague 2, Czech Republic
| | - Karel Bernášek
- Department of Low
Temperature Physics, Faculty of Mathematics and Physics, Charles University (Univerzita Karlova), V Holešovičkách
2, 180 00 Prague 8, Czech Republic
| | - Andrea Gálisová
- Department of Radiodiagnostic
and Interventional Radiology, Magnetic Resonance Unit, Institute for Clinical and Experimental Medicine, Vídeňská 1958/9, 140 21 Prague 4, Czech Republic
| | - Vít Herynek
- Department of Radiodiagnostic
and Interventional Radiology, Magnetic Resonance Unit, Institute for Clinical and Experimental Medicine, Vídeňská 1958/9, 140 21 Prague 4, Czech Republic
| | - Ivana Císařová
- Department of Inorganic
Chemistry, Faculty of Science, Charles University (Univerzita Karlova), Hlavova 2030, 128 43 Prague 2, Czech Republic
| | - Jan Kotek
- Department of Inorganic
Chemistry, Faculty of Science, Charles University (Univerzita Karlova), Hlavova 2030, 128 43 Prague 2, Czech Republic
| | - Jan Lang
- Department of Low
Temperature Physics, Faculty of Mathematics and Physics, Charles University (Univerzita Karlova), V Holešovičkách
2, 180 00 Prague 8, Czech Republic
| | - Stanislava Matějková
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nám. 2, 166 10 Prague, Czech Republic
| | - Petr Hermann
- Department of Inorganic
Chemistry, Faculty of Science, Charles University (Univerzita Karlova), Hlavova 2030, 128 43 Prague 2, Czech Republic
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Végh D, Somogyi A, Bányai D, Lakatos M, Balogh M, Al-Khrasani M, Fürst S, Vizi E, Hermann P. Effects of articaine on [ 3 H]noradrenaline release from cortical and spinal cord slices prepared from normal and streptozotocin-induced diabetic rats and compared to lidocaine. Brain Res Bull 2017; 135:157-162. [DOI: 10.1016/j.brainresbull.2017.10.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 10/12/2017] [Accepted: 10/16/2017] [Indexed: 11/29/2022]
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Krchová T, Herynek V, Gálisová A, Blahut J, Hermann P, Kotek J. Eu(III) Complex with DO3A-amino-phosphonate Ligand as a Concentration-Independent pH-Responsive Contrast Agent for Magnetic Resonance Spectroscopy (MRS). Inorg Chem 2017; 56:2078-2091. [PMID: 28170242 DOI: 10.1021/acs.inorgchem.6b02749] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A new DOTA-like ligand H5do3aNP with a 2-[amino(methylphosphonic acid)]ethyl-coordinating pendant arm was prepared, and its coordinating properties were studied by NMR spectroscopy and potentiometry. The study revealed a rare slow exchange (on the 1H and 31P NMR time scale) between protonated and unprotonated complex species with a corresponding acidity constant pKA ∼ 8.0. This unusually slow time scale associated with protonation is caused by a significant geometric change from square-antiprismatic (SA) arrangement observed for protonated complex SA-[Eu(Hdo3aNP)]- to twisted-square-antiprismatic (TSA) arrangement found for deprotonated complex TSA-[Eu(do3aNP)]2-. This behavior results in simultaneous occurrence of the signals of both species in the 31P NMR spectra at approximately -118 and +70 ppm, respectively. Such an unprecedented difference in the chemical shifts between species differing by a proton is caused by a significant movement of the principal magnetic axis and by a change of phosphorus atom position in the coordination sphere of the central Eu(III) ion (i.e., by relative movement of the phosphorus atom with respect to the principal magnetic axis). It changes the sign of the paramagnetic contribution to the 31P NMR chemical shift. The properties discovered can be employed in the measurement of pH by MRS techniques as presented by proof-of-principle experiments on phantoms.
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Affiliation(s)
- Tereza Krchová
- Department of Inorganic Chemistry, Faculty of Science, Charles University , Hlavova 2030, Prague 2 128 43, Czech Republic
| | - Vít Herynek
- Department of Radiodiagnostic and Interventional Radiology, Magnetic Resonance Unit, Institute for Clinical and Experimental Medicine , Vídeňská 1958/9, Prague 4 140 21, Czech Republic
| | - Andrea Gálisová
- Department of Radiodiagnostic and Interventional Radiology, Magnetic Resonance Unit, Institute for Clinical and Experimental Medicine , Vídeňská 1958/9, Prague 4 140 21, Czech Republic
| | - Jan Blahut
- Department of Inorganic Chemistry, Faculty of Science, Charles University , Hlavova 2030, Prague 2 128 43, Czech Republic
| | - Petr Hermann
- Department of Inorganic Chemistry, Faculty of Science, Charles University , Hlavova 2030, Prague 2 128 43, Czech Republic
| | - Jan Kotek
- Department of Inorganic Chemistry, Faculty of Science, Charles University , Hlavova 2030, Prague 2 128 43, Czech Republic
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40
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Procházková S, Kubíček V, Böhmová Z, Holá K, Kotek J, Hermann P. DOTA analogues with a phosphinate-iminodiacetate pendant arm: modification of the complex formation rate with a strongly chelating pendant. Dalton Trans 2017; 46:10484-10497. [DOI: 10.1039/c7dt01797a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The formation of highly stable out-of-cage complexes slows down the transfer of the metal ion into the cavity of the macrocyclic ligand.
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Affiliation(s)
- Soňa Procházková
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague 2
- Czech Republic
| | - Vojtěch Kubíček
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague 2
- Czech Republic
| | - Zuzana Böhmová
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague 2
- Czech Republic
| | - Kateřina Holá
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague 2
- Czech Republic
| | - Jan Kotek
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague 2
- Czech Republic
| | - Petr Hermann
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague 2
- Czech Republic
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41
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Blahut J, Hermann P, Tošner Z, Platas-Iglesias C. A combined NMR and DFT study of conformational dynamics in lanthanide complexes of macrocyclic DOTA-like ligands. Phys Chem Chem Phys 2017; 19:26662-26671. [DOI: 10.1039/c7cp05296k] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A NMR study of the conformational dynamics of paramagnetic Eu3+ complexes provides parameters for isomer interconversion with unprecedented accuracy, while DFT reveals mechanistic details at the molecular level.
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Affiliation(s)
- Jan Blahut
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Prague 2
- Czech Republic
| | - Petr Hermann
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Prague 2
- Czech Republic
| | - Zdeněk Tošner
- Faculty of Science
- Charles University
- Prague 2
- Czech Republic
| | - Carlos Platas-Iglesias
- Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química
- Facultade de Ciencias
- Universidade da Coruña
- 15071 A Coruña
- Spain
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Price TW, Gallo J, Kubíček V, Böhmová Z, Prior TJ, Greenman J, Hermann P, Stasiuk GJ. Amino acid based gallium-68 chelators capable of radiolabeling at neutral pH. Dalton Trans 2017; 46:16973-16982. [DOI: 10.1039/c7dt03398b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein we show a flexible synthesis for bifunctional chelators based on amino acids that rapidly complex 68Ga under physiological conditions.
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Affiliation(s)
- Thomas W. Price
- School of Life Sciences
- Department of Biomedical Sciences
- University of Hull
- Hull
- UK
| | - Juan Gallo
- Advanced (magnetic) Theranostic Nanostructures Lab
- International Iberian Nanotechnology Laboratory
- 4715-330 Braga
- Portugal
| | - Vojtěch Kubíček
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Prague 2
- Czech Republic
| | - Zuzana Böhmová
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Prague 2
- Czech Republic
| | - Timothy J. Prior
- Chemistry
- School of Mathematical and Physical Sciences
- University of Hull
- Hull
- UK
| | - John Greenman
- School of Life Sciences
- Department of Biomedical Sciences
- University of Hull
- Hull
- UK
| | - Petr Hermann
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- Prague 2
- Czech Republic
| | - Graeme J. Stasiuk
- School of Life Sciences
- Department of Biomedical Sciences
- University of Hull
- Hull
- UK
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Hermelink A, Naumann D, Piesker J, Lasch P, Laue M, Hermann P. Towards a correlative approach for characterising single virus particles by transmission electron microscopy and nanoscale Raman spectroscopy. Analyst 2017; 142:1342-1349. [DOI: 10.1039/c6an02151d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The morphology and structure of biological nanoparticles, such as viruses, can be efficiently analysed by transmission electron microscopy (TEM).
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Affiliation(s)
- A. Hermelink
- Centre for Biological Threats and Special Pathogens – Proteomics and Spectroscopy (ZBS6)
- Robert Koch-Institute
- 13353 Berlin
- Germany
| | - D. Naumann
- Centre for Biological Threats and Special Pathogens – Proteomics and Spectroscopy (ZBS6)
- Robert Koch-Institute
- 13353 Berlin
- Germany
| | - J. Piesker
- Centre for Biological Threats and Special Pathogens – Advanced Light and Electron Microscopy (ZBS4)
- Robert Koch-Institute
- 13353 Berlin
- Germany
| | - P. Lasch
- Centre for Biological Threats and Special Pathogens – Proteomics and Spectroscopy (ZBS6)
- Robert Koch-Institute
- 13353 Berlin
- Germany
| | - M. Laue
- Centre for Biological Threats and Special Pathogens – Advanced Light and Electron Microscopy (ZBS4)
- Robert Koch-Institute
- 13353 Berlin
- Germany
| | - P. Hermann
- Centre for Biological Threats and Special Pathogens – Proteomics and Spectroscopy (ZBS6)
- Robert Koch-Institute
- 13353 Berlin
- Germany
- Physikalisch-Technische Bundesanstalt (PTB)
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Meckel M, Kubíček V, Hermann P, Miederer M, Rösch F. A DOTA based bisphosphonate with an albumin binding moiety for delayed body clearance for bone targeting. Nucl Med Biol 2016; 43:670-678. [PMID: 27560354 DOI: 10.1016/j.nucmedbio.2016.07.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2016] [Revised: 06/19/2016] [Accepted: 07/25/2016] [Indexed: 11/18/2022]
Abstract
Radiolabeled bisphosphonates are commonly used in the diagnosis and therapy of bone metastases. Blood clearance of bisphosphonates is usually fast and only 30%-50% of the injected activity is retained in the skeleton, while most of the activity is excreted by the urinary tract. A longer blood circulation may enhance accumulation of bisphosphonate compounds in bone metastases. Therefore, a chemically modified macrocyclic bisphosphonate derivative with an additional human albumin binding entity was synthesized and pharmacokinetics of its complex was evaluated. The DOTA-bisphosphonate conjugate BPAMD was compared against the novel DOTAGA-derived albumin-binding bisphosphonate DOTAGA(428-d-Lys)MBP (L1). The ligands were labeled with 68Ga(III) and were evaluated in in vitro binding studies to hydroxyapatite (HA) as well as to human serum albumin. The compounds were finally compared in in vivo PET and ex vivo organ distribution studies in small animals over 6h. Binding studies revealed a consistent affinity of both bisphosphonate tracers to HA. Small animal PET and ex vivo organ distribution studies showed longer blood retention of [68Ga]L1. [68Ga]BPAMD is initially more efficiently bound to the bone but skeletal accumulation of the modified compound and [68Ga]BPAMD equalized at 6h p.i. Ratios of femur epiphyseal plate to ordinary bone showed to be more favorable for [68Ga]L1 than for [68Ga]BPAMD due to the longer circulation time of the new tracer. Thus, the chemical modification of BPAMD toward an albumin-binding bisphosphonate, L1, resulted in a novel PET tracer which conserves advantages of both functional groups within one and the same molecule. The properties of this new diagnostic tracer are expected to be preserved in 177Lu therapeutic agent with the same ligand (a theranostic pair).
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Affiliation(s)
- Marian Meckel
- Institute of Nuclear Chemistry, Johannes-Gutenberg-University Mainz, Germany
| | - Vojtěch Kubíček
- Department of Inorganic Chemistry, Charles University, Prague, Czech Republic
| | - Petr Hermann
- Department of Inorganic Chemistry, Charles University, Prague, Czech Republic
| | | | - Frank Rösch
- Institute of Nuclear Chemistry, Johannes-Gutenberg-University Mainz, Germany
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Procházková S, Hraníček J, Kubíček V, Hermann P. Formation kinetics of europium(III) complexes of DOTA and its bis(phosphonate) bearing analogs. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.03.039] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Bergmann R, Meckel M, Kubíček V, Pietzsch J, Steinbach J, Hermann P, Rösch F. (177)Lu-labelled macrocyclic bisphosphonates for targeting bone metastasis in cancer treatment. EJNMMI Res 2016; 6:5. [PMID: 26780082 PMCID: PMC4715021 DOI: 10.1186/s13550-016-0161-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Accepted: 01/05/2016] [Indexed: 11/24/2022] Open
Abstract
Background Metastatic bone lesion is a common syndrome of many cancer diseases in an advanced state. The major symptom is severe pain, spinal cord compression, and pathological fracture, associated with an obvious morbidity. Common treatments including systemic application of bisphosphonate drugs aim on pain reduction and on improving the quality of life of the patient. Particularly, patients with multiple metastatic lesions benefit from bone-targeting therapeutic radiopharmaceuticals. Agents utilizing beta-emitting radionuclides in routine clinical praxis are, for example, [89Sr]SrCl2 and [153Sm]Sm-EDTMP. No-carrier-added (n.c.a.) 177Lu is remarkably suitable for an application in this scope. Methods Five 1,4,7,10-tetraazacyclododecane N,N′,N′′,N′′-tetra-acetic acid (DOTA)- and DO2A-based bisphosphonates, including monomeric and dimeric structures and one 1,4,7-triazacyclononane-1,4-diacetic acid (NO2A) derivative, were synthesized and labelled with n.c.a. 177Lu. Radio-TLC and high-performance liquid chromatography (HPLC) methods were successfully established for determining radiochemical yields and for quality control. Their binding to hydroxyapatite was measured in vitro. Ex vivo biodistribution experiments and dynamic in vivo single photon computed tomography (SPECT)/CT measurements were performed in healthy rats for 5 min and 1 h periods. Data on %ID/g or standard uptake value (SUV) for femur, blood, and soft-tissue organs were analyzed and compared with [177Lu]citrate. Results Radiolabelling yields for [177Lu]Lu-DOTA and [177Lu]Lu-NO2A monomeric bisphosphonate complexes were >98 % within 15 min. The dimeric macrocyclic bisphosphonates showed a decelerated labelling kinetics, reaching a plateau after 30 min of 60 to 90 % radiolabelling yields. All 177Lu-bisphosphonate complexes showed exclusive accumulation in the skeleton. Blood clearance and renal elimination were fast. SUV data (all for 1 h p.i.) in the femur ranged from 3.34 to 5.67. The bone/blood ratios were between 3.6 and 135.6, correspondingly. 177Lu-bisphosphonate dimers showed a slightly higher bone accumulation (SUVfemur = 4.48 ± 0.38 for [177Lu]Lu-DO2A(PBP)2; SUVfemur = 5.41 ± 0.46 for [177Lu]Lu-DOTA(MBP)2) but a slower blood clearance (SUVblood = 1.25 ± 0.09 for [177Lu]Lu-DO2A(PBP)2; SUVblood = 1.43 ± 0.32 for [177Lu]Lu-DOTA(MBP)2). Conclusions Lu-complexes of macrocyclic bisphosphonates might become options for the therapy of skeletal metastases in the near future, since they show high uptake in bone together with a very low soft-tissue accumulation.
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Affiliation(s)
- Ralf Bergmann
- Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
| | - Marian Meckel
- Institute of Nuclear Chemistry, Johannes Gutenberg University of Mainz, Fritz-Strassmann-Weg 2, 55128, Mainz, Germany
| | - Vojtěch Kubíček
- Faculty of Science, Department of Inorganic Chemistry, Charles University Prague, Prague, Czech Republic
| | - Jens Pietzsch
- Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
| | - Jörg Steinbach
- Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
| | - Petr Hermann
- Faculty of Science, Department of Inorganic Chemistry, Charles University Prague, Prague, Czech Republic
| | - Frank Rösch
- Institute of Nuclear Chemistry, Johannes Gutenberg University of Mainz, Fritz-Strassmann-Weg 2, 55128, Mainz, Germany.
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47
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Blahut J, Hermann P, Gálisová A, Herynek V, Císařová I, Tošner Z, Kotek J. Nickel(ii) complexes of N-CH2CF3 cyclam derivatives as contrast agents for 19F magnetic resonance imaging. Dalton Trans 2016; 45:474-8. [DOI: 10.1039/c5dt04138d] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nickel(ii) complexes of N,N′′-2,2,2-trifluoroethyl cyclam derivatives show significant 19F NMR relaxation rate enhancement useful for 19F MRI imaging.
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Affiliation(s)
- Jan Blahut
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University (Univerzita Karlova)
- 128 43 Prague 2
- Czech Republic
| | - Petr Hermann
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University (Univerzita Karlova)
- 128 43 Prague 2
- Czech Republic
| | - Andrea Gálisová
- Department of Radiodiagnostic and Interventional Radiology
- Magnetic Resonance Unit
- Institute for Clinical and Experimental Medicine
- Prague 4
- 140 21 Czech Republic
| | - Vít Herynek
- Department of Radiodiagnostic and Interventional Radiology
- Magnetic Resonance Unit
- Institute for Clinical and Experimental Medicine
- Prague 4
- 140 21 Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University (Univerzita Karlova)
- 128 43 Prague 2
- Czech Republic
| | - Zdeněk Tošner
- NMR Laboratory
- Faculty of Science
- Charles University (Univerzita Karlova)
- 128 43 Prague 2
- Czech Republic
| | - Jan Kotek
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University (Univerzita Karlova)
- 128 43 Prague 2
- Czech Republic
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48
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Kerdjoudj R, Pniok M, Alliot C, Kubíček V, Havlíčková J, Rösch F, Hermann P, Huclier-Markai S. Scandium(iii) complexes of monophosphorus acid DOTA analogues: a thermodynamic and radiolabelling study with 44Sc from cyclotron and from a 44Ti/44Sc generator. Dalton Trans 2016; 45:1398-409. [DOI: 10.1039/c5dt04084a] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The influence of the phosphonic/phosphinic acid pendant arm in DOTA derivatives on properties of their Sc3+ complexes and efficiency of their 44Sc labelling were investigated.
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Affiliation(s)
- R. Kerdjoudj
- Laboratoire Subatech
- UMR 6457
- Ecole des Mines de Nantes/CNRS/IN2P3/Université de Nantes
- F-44307 Nantes Cedex 3
- France
| | - M. Pniok
- Department of Inorganic Chemistry
- Faculty of Science
- Universita Karlova
- CZ-12843 Prague 2
- Czech Republic
| | - C. Alliot
- ARRONAX GIP
- F-44817 Nantes Cedex
- France
- CRCNA
- Inserm/CNRS/Université de Nantes
| | - V. Kubíček
- Department of Inorganic Chemistry
- Faculty of Science
- Universita Karlova
- CZ-12843 Prague 2
- Czech Republic
| | - J. Havlíčková
- Department of Inorganic Chemistry
- Faculty of Science
- Universita Karlova
- CZ-12843 Prague 2
- Czech Republic
| | - F. Rösch
- Institute of Nuclear Chemistry
- Johannes-Gutenberg-University of Mainz
- D-55128 Mainz
- Germany
| | - P. Hermann
- Department of Inorganic Chemistry
- Faculty of Science
- Universita Karlova
- CZ-12843 Prague 2
- Czech Republic
| | - S. Huclier-Markai
- Laboratoire Subatech
- UMR 6457
- Ecole des Mines de Nantes/CNRS/IN2P3/Université de Nantes
- F-44307 Nantes Cedex 3
- France
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49
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Krchová T, Gálisová A, Jirák D, Hermann P, Kotek J. Ln(iii)-complexes of a DOTA analogue with an ethylenediamine pendant arm as pH-responsive PARACEST contrast agents. Dalton Trans 2016; 45:3486-96. [DOI: 10.1039/c5dt04443j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
New contrast agents useful for pH determination (in the biologically relevant pH range) by Magnetic Resonance Imaging (MRI) using magnetization transfer ratio approach are presented.
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Affiliation(s)
- T. Krchová
- Department of Inorganic Chemistry
- Faculty of Science
- Universita Karlova (Charles University)
- 128 43 Prague 2
- Czech Republic
| | - A. Gálisová
- Department of Radiodiagnostic and Interventional Radiology
- Magnetic Resonance Unit
- Institute for Clinical and Experimental Medicine
- Prague 4
- Czech Republic
| | - D. Jirák
- Department of Radiodiagnostic and Interventional Radiology
- Magnetic Resonance Unit
- Institute for Clinical and Experimental Medicine
- Prague 4
- Czech Republic
| | - P. Hermann
- Department of Inorganic Chemistry
- Faculty of Science
- Universita Karlova (Charles University)
- 128 43 Prague 2
- Czech Republic
| | - J. Kotek
- Department of Inorganic Chemistry
- Faculty of Science
- Universita Karlova (Charles University)
- 128 43 Prague 2
- Czech Republic
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50
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David T, Kubíček V, Gutten O, Lubal P, Kotek J, Pietzsch HJ, Rulíšek L, Hermann P. Cyclam Derivatives with a Bis(phosphinate) or a Phosphinato–Phosphonate Pendant Arm: Ligands for Fast and Efficient Copper(II) Complexation for Nuclear Medical Applications. Inorg Chem 2015; 54:11751-66. [DOI: 10.1021/acs.inorgchem.5b01791] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tomáš David
- Department of Inorganic
Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 12840 Prague, Czech Republic
| | - Vojtěch Kubíček
- Department of Inorganic
Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 12840 Prague, Czech Republic
| | - Ondrej Gutten
- Institute of Organic Chemistry and Biochemistry AS CR, Flemingovo náměstí
2, 16610 Prague, Czech Republic
| | - Přemysl Lubal
- Department of Chemistry, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic
- Central
European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 62500 Brno, Czech Republic
| | - Jan Kotek
- Department of Inorganic
Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 12840 Prague, Czech Republic
| | - Hans-Jürgen Pietzsch
- Institute of Radiopharmaceutical
Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany
| | - Lubomír Rulíšek
- Institute of Organic Chemistry and Biochemistry AS CR, Flemingovo náměstí
2, 16610 Prague, Czech Republic
| | - Petr Hermann
- Department of Inorganic
Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 12840 Prague, Czech Republic
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