1
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Dong Y, Zhao J, Wu L, Chen Y. Cu(II)-induced magnetic resonance tuning and enhanced magnetic relaxation switching immunosensor for sensitive detection of chlorpyrifos and Salmonella. Food Chem 2024; 446:138847. [PMID: 38422644 DOI: 10.1016/j.foodchem.2024.138847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 02/19/2024] [Accepted: 02/21/2024] [Indexed: 03/02/2024]
Abstract
Magnetic relaxation switching (MRS) biosensors have been recognized as useful analytical tools for a range of targets; however, traditional MRS biosensors are limited by the "prozone effect", resulting in a narrow linear range and low sensitivity. Herein, we proposed a paramagnetic Cu2+-induced magnetic resonance tuning (MRET) strategy, based on which Cu2+ ions and magnetic nanoparticles (MNPs) were adopted to construct a Cu-MNP-mediated MRS (Cu-M-MRS) immunosensor with Cu2+ ions acting as a quencher and MNPs as an enhancer. An Fe3O4@polydopamine-secondary antibody conjugate was prepared and used to correlate the amount of Cu2+ ions to the target concentration through an immunoassay. Based on the immunoreaction, the Cu-M-MRS immunosensor enabled the sensitive detection of chlorpyrifos (0.05 ng/mL, a 77-fold enhancement in sensitivity compared with the traditional MRS immunosensor) and Salmonella (50 CFU/mL). The proposed MRET strategy effectively improved the sensitivity and accuracy of the MRS immunosensor, offering a promising and versatile platform for food safety detection.
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Affiliation(s)
- Yongzhen Dong
- State Key Laboratory of Marine Food Processing and Safety Control, Dalian Polytechnic University, Dalian 116034, Liaoning, China; Academy of Food Interdisciplinary Science, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, Liaoning, China
| | - Junpeng Zhao
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei, China
| | - Long Wu
- School of Food Science and Engineering, Key Laboratory of Tropical and Vegetables Quality and Safety for State Market Regulation, Hainan University, Haikou 570228, China
| | - Yiping Chen
- State Key Laboratory of Marine Food Processing and Safety Control, Dalian Polytechnic University, Dalian 116034, Liaoning, China; Academy of Food Interdisciplinary Science, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, Liaoning, China.
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2
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Guo X, Zhang L, Hu J, Szilágyi B, Yu M, Chen S, Tircsó G, Zhou X, Tao J. Improving the potential of paraCEST through magnetic-coupling induced line sharpening. Chem Sci 2023; 14:14157-14165. [PMID: 38098703 PMCID: PMC10717539 DOI: 10.1039/d3sc04770a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Accepted: 11/17/2023] [Indexed: 12/17/2023] Open
Abstract
Magnetic coupling between paramagnetic centers is a crucial phenomenon in the design of efficient MRI contrast agents. In this study, we investigate the paraCEST properties and magnetic coupling effects of a novel homodinuclear Ni(ii) complex, 1, containing a Robson type macrocyclic ligand. A thorough analysis of the complex's electronic and magnetic properties revealed that the magnetic coupling effect reduces the transverse relaxation rate and enhances the sharpness of the proton resonances, leading to enhanced CEST efficiency. This novel mechanism, which we coined "magnetic-coupling induced line sharpening" (MILS), can be crucial for optimizing the performance of paramagnetic metal complexes in paraCEST imaging. Moreover, magnetic coupling plays a critical role in the relaxation properties of homodinuclear complexes. Our study not only paves the way for the creation of advanced paraCEST agents with enhanced CEST capabilities and sensitivity but also provides valuable guidance for the design of other MRI contrast agents utilizing dinuclear metal complexes.
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Affiliation(s)
- Xin Guo
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology Beijing 102488 China
| | - Lei Zhang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics Wuhan 430071 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Jiesheng Hu
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology Beijing 102488 China
| | - Balázs Szilágyi
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen Egyetem tér 1 H-4032 Debrecen Hungary
- Doctoral School of Chemistry, University of Debrecen Egyetem tér 1 H-4032 Debrecen Hungary
| | - Meng Yu
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology Beijing 102488 China
| | - Shizhen Chen
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics Wuhan 430071 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Gyula Tircsó
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen Egyetem tér 1 H-4032 Debrecen Hungary
| | - Xin Zhou
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics Wuhan 430071 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Jun Tao
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology Beijing 102488 China
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3
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Pradhan RN, Irrera P, Romdhane F, Panda SK, Longo DL, Torres J, Kremer C, Assaiya A, Kumar J, Singh AK. Di-Pyridine-Containing Macrocyclic Triamide Fe(II) and Ni(II) Complexes as ParaCEST Agents. Inorg Chem 2022; 61:16650-16663. [PMID: 36205705 DOI: 10.1021/acs.inorgchem.2c02242] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Fe(II) and Ni(II) paraCEST contrast agents containing the di-pyridine macrocyclic ligand 2,2',2″-(3,7,10-triaza-1,5(2,6)-dipyridinacycloundecaphane-3,7,10-triyl)triacetamide (DETA) are reported here. Both [Fe(DETA)]2+ and [Ni(DETA)]2+ complexes were structurally characterized. Crystallographic data revealed the seven-coordinated distorted pentagonal bipyramidal geometry of the [Fe(DETA)]·(BF4)2·MeCN complex with five coordinated nitrogen atoms from the macrocyclic ring and two coordinated oxygen atoms from two amide pendant arms. The [Ni(DETA)]·Cl2·2H2O complex was six-coordinated in nature with a distorted octahedral geometry. Four coordinated nitrogen atoms were from the macrocyclic ring, and two coordinated oxygen atoms were from two amide pendant arms. [Fe(DETA)]2+ exhibited well-resolved sharp proton resonances, whereas very broad proton resonances were observed in the case of [Ni(DETA)]2+ due to the long electronic relaxation times. The CEST peaks for the [Fe(DETA)]2+ complex showed one highly downfield-shifted and intense peak at 84 ppm with another shifted but less intense peak at 28 ppm with good CEST contrast efficiency at body temperature, whereas [Ni(DETA)]2+ showed only one highly shifted intense peak at 78 ppm from the bulk water protons. Potentiometric titrations were performed to determine the protonation constants of the ligand and the thermodynamic stability constant of the [M(DETA)]2+ (M = Fe, Co, Ni, Cu, Zn) species at 25.0 °C and I = 0.15 mol·L-1 NaClO4. Metal exchange studies confirmed the stability of the complexes in acidic medium in the presence of physiologically relevant anions and an equimolar concentration of Zn(II) ions.
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Affiliation(s)
- Rabindra N Pradhan
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar752050, India
| | - Pietro Irrera
- University of Campania "Luigi Vanvitelli", Caserta81100, Italy
| | - Feriel Romdhane
- Institute of Biostructures and Bioimaging (IBB), National Research Council of Italy (CNR), Torino10126, Italy
| | - Suvam Kumar Panda
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar752050, India
| | - Dario Livio Longo
- Institute of Biostructures and Bioimaging (IBB), National Research Council of Italy (CNR), Torino10126, Italy
| | - Julia Torres
- Área Química Inorgánica, Departamento Estrella Campos, Facultad de Química, Universidad de la República, Montevideo11800, Uruguay
| | - Carlos Kremer
- Área Química Inorgánica, Departamento Estrella Campos, Facultad de Química, Universidad de la República, Montevideo11800, Uruguay
| | - Anshul Assaiya
- National Centre for Cell Science, NCCS Complex, Pune University Campus, Ganeshkhind, Pune411 007, India
| | - Janesh Kumar
- National Centre for Cell Science, NCCS Complex, Pune University Campus, Ganeshkhind, Pune411 007, India
| | - Akhilesh K Singh
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar752050, India
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4
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Morrow JR, Raymond JJ, Chowdhury MSI, Sahoo PR. Redox-Responsive MRI Probes Based on First-Row Transition-Metal Complexes. Inorg Chem 2022; 61:14487-14499. [PMID: 36067522 DOI: 10.1021/acs.inorgchem.2c02197] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The presence of multiple oxidation and spin states of first-row transition-metal complexes facilitates the development of switchable MRI probes. Redox-responsive probes capitalize on a change in the magnetic properties of the different oxidation states of the paramagnetic metal ion center upon exposure to biological oxidants and reductants. Transition-metal complexes that are useful for MRI can be categorized according to whether they accelerate water proton relaxation (T1 or T2 agents), induce paramagnetic shifts of 1H or 19F resonances (paraSHIFT agents), or are chemical exchange saturation transfer (CEST) agents. The various oxidation state couples and their properties as MRI probes are summarized with a focus on Co(II)/Co(III) or Fe(II)/Fe(III) complexes as small molecules or as liposomal agents. Solution studies of these MRI probes are reviewed with an emphasis on redox changes upon treatment with oxidants or with enzymes that are physiologically important in inflammation and disease. Finally, we outline the challenges of developing these probes further for in vivo MRI applications.
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Affiliation(s)
- Janet R Morrow
- Department of Chemistry, University at Buffalo, the State University of New York, Amherst, New York 14260, United States
| | - Jaclyn J Raymond
- Department of Chemistry, University at Buffalo, the State University of New York, Amherst, New York 14260, United States
| | - Md Saiful I Chowdhury
- Department of Chemistry, University at Buffalo, the State University of New York, Amherst, New York 14260, United States
| | - Priya Ranjan Sahoo
- Department of Chemistry, University at Buffalo, the State University of New York, Amherst, New York 14260, United States
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5
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Pérez-Lourido P, Madarasi E, Antal F, Esteban-Gómez D, Wang G, Angelovski G, Platas-Iglesias C, Tircsó G, Valencia L. Stable and inert macrocyclic cobalt(II) and nickel(II) complexes with paraCEST response. Dalton Trans 2022; 51:1580-1593. [PMID: 34991150 DOI: 10.1039/d1dt03217h] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
We report the synthesis of the macrocyclic ligands 3,9-PC2AMH (2,2'-(3,6,9-triaza-1(2,6)-pyridinacyclodecaphane-3,9-diyl)diacetamide) and 3,9-PC2AMtBu (2,2'-(3,6,9-triaza-1(2,6)-pyridinacyclodecaphane-3,9-diyl)bis(N-tert-butyl)acetamide) which contain a pyclen platform functionalized with acetamide or tert-butylacetamide pendant arms at positions 3 and 9 of the macrocyclic unit. The corresponding Co(II) and Ni(II) complexes were prepared, isolated and characterised as potential paramagnetic chemical exchange saturation transfer (paraCEST) agents. The X-ray structures of the Ni(II) complexes reveal six-coordination of the ligands to the metal ion. The Co(II) complex with 3,9-PC2AMtBu shows a similar six-coordinate structure in the solid state, while the Co(II) complex with 3,9-PC2AMH contains a seven-coordinate metal ion, seventh coordination being completed by the presence of an inner-sphere water molecule. The structure of the Co(II) complexes was investigated using 1H NMR spectroscopy and computational methods. The complexes present a seven-coordinate structure in solution, as demonstrated by the analysis of the paramagnetic shifts using density functional theory. Ligand protonation constants and stability constants of the complexes with 3,9-PC2AMH were determined using potentiometric titrations (I = 0,15 M NaCl). The Co(II) complex was found to be more stable than the Ni(II) analogue (log KCoL = 14.46(5) and log KNiL = 13.15(3)). However, the Ni(II) and Co(II) complexes display similar rate constants characterizing the proton-assisted dissociation mechanism. The presence of highly shifted 1H NMR signals due to the amide protons in slow exchange with bulk water results in sizeable CEST signals, which are observed at +67 and +15 ppm for the Co(II) complex with 3,9-PC2AMH and +42 and +7 ppm for the Ni(II) analogue at 25 °C.
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Affiliation(s)
- Paulo Pérez-Lourido
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidade de Vigo, As Lagoas, Marcosende, 36310 Pontevedra, Spain.
| | - Enikő Madarasi
- Doctoral School of Chemistry, Faculty of Science and Technology, University of Debrecen, H-4010, Debrecen, Egyetem tér 1, Hungary
| | - Fanni Antal
- Doctoral School of Chemistry, Faculty of Science and Technology, University of Debrecen, H-4010, Debrecen, Egyetem tér 1, Hungary
| | - David Esteban-Gómez
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Gaoji Wang
- MR Neuroimaging Agents, Max Planck Institute for Biological Cybernetics, 72076 Tübingen, Germany
| | - Goran Angelovski
- MR Neuroimaging Agents, Max Planck Institute for Biological Cybernetics, 72076 Tübingen, Germany.,Laboratory of Molecular and Cellular Neuroimaging, International Center for Primate Brain Research (ICPBR), Center for Excellence in Brain Science and Intelligence Technology (CEBSIT), Chinese Academy of Sciences (CAS), 20031 Shanghai, PR China
| | - Carlos Platas-Iglesias
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Gyula Tircsó
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, H-4010, Debrecen, Egyetem tér 1, Hungary
| | - Laura Valencia
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidade de Vigo, As Lagoas, Marcosende, 36310 Pontevedra, Spain.
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6
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Castro G, Wang G, Gambino T, Esteban-Gómez D, Valencia L, Angelovski G, Platas-Iglesias C, Pérez-Lourido P. Lanthanide(III) Complexes Based on an 18-Membered Macrocycle Containing Acetamide Pendants. Structural Characterization and paraCEST Properties. Inorg Chem 2021; 60:1902-1914. [PMID: 33471999 PMCID: PMC8929667 DOI: 10.1021/acs.inorgchem.0c03385] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report a detailed investigation of the coordination properties of macrocyclic lanthanide complexes containing a 3,6,10,13-tetraaza-1,8(2,6)-dipyridinacyclotetradecaphane scaffold functionalized with four acetamide pendant arms. The X-ray structures of the complexes with the large Ln3+ ions (La and Sm) display 12- and 10-coordinated metal ions, where the coordination sphere is fulfilled by the six N atoms of the macrocycle, the four O atoms of the acetamide pendants, and a bidentate nitrate anion in the La3+ complex. The analogous Yb3+ complex presents, however, a 9-coordinated metal ion because one of the acetamide pendant arms remains uncoordinated. 1H NMR studies indicate that the 10-coordinated form is present in solution throughout the lanthanide series from La to Tb, while the smaller lanthanides form 9-coordinated species. 1H and 89Y NMR studies confirm the presence of this structural change because the two species are present in solution. Analysis of the 1H chemical shifts observed for the Tb3+ complex confirms its D2 symmetry in aqueous solution and evidences a highly rhombic magnetic susceptibility tensor. The acetamide resonances of the Pr3+ and Tb3+ complexes provided sizable paraCEST effects, as demonstrated by the corresponding Z-spectra recorded at different temperatures and studies on tube phantoms recorded at 22 °C.
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Affiliation(s)
- Goretti Castro
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidade de Vigo, As Lagoas, Marcosende, 36310 Pontevedra, Spain
| | - Gaoji Wang
- MR Neuroimaging Agents, Max Planck Institute for Biological Cybernetics, 72076 Tübingen, Germany
| | - Tanja Gambino
- MR Neuroimaging Agents, Max Planck Institute for Biological Cybernetics, 72076 Tübingen, Germany
| | - David Esteban-Gómez
- Centro de Investigacións Científicas Avanzadas and Departamento de Química, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Laura Valencia
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidade de Vigo, As Lagoas, Marcosende, 36310 Pontevedra, Spain
| | - Goran Angelovski
- MR Neuroimaging Agents, Max Planck Institute for Biological Cybernetics, 72076 Tübingen, Germany.,Laboratory of Molecular and Cellular Neuroimaging, International Center for Primate Brain Research, Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, 20031 Shanghai, P. R. China
| | - Carlos Platas-Iglesias
- Centro de Investigacións Científicas Avanzadas and Departamento de Química, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Paulo Pérez-Lourido
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidade de Vigo, As Lagoas, Marcosende, 36310 Pontevedra, Spain
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7
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Rodríguez-Rodríguez A, Zaiss M, Esteban-Gómez D, Angelovski G, Platas-Iglesias C. Paramagnetic chemical exchange saturation transfer agents and their perspectives for application in magnetic resonance imaging. INT REV PHYS CHEM 2020. [DOI: 10.1080/0144235x.2020.1823167] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Aurora Rodríguez-Rodríguez
- Departamento de Química, Facultade de Ciencias & Centro de Investigacións Científicas Avanzadas (CICA), Universidade da Coruña, 15071 A Coruña, Spain
| | - Moritz Zaiss
- Department of Neuroradiology, University Clinic Erlangen, Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - David Esteban-Gómez
- Departamento de Química, Facultade de Ciencias & Centro de Investigacións Científicas Avanzadas (CICA), Universidade da Coruña, 15071 A Coruña, Spain
| | - Goran Angelovski
- MR Neuroimaging Agents, Max Planck Institute for Biological Cybernetics, Tübingen, Germany
- Lab of Molecular and Cellular Neuroimaging, International Center for Primate Brain Research (ICPBR), Center for Excellence in Brain Science and Intelligence Technology (CEBSIT), Chinese Academy of Science (CAS), Shanghai, P.R. China
| | - Carlos Platas-Iglesias
- Departamento de Química, Facultade de Ciencias & Centro de Investigacións Científicas Avanzadas (CICA), Universidade da Coruña, 15071 A Coruña, Spain
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8
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Abozeid SM, Asik D, Sokolow GE, Lovell JF, Nazarenko AY, Morrow JR. Co II Complexes as Liposomal CEST Agents. Angew Chem Int Ed Engl 2020; 59:12093-12097. [PMID: 32330368 PMCID: PMC7502271 DOI: 10.1002/anie.202003479] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Indexed: 12/23/2022]
Abstract
Three paramagnetic CoII macrocyclic complexes containing 2-hydroxypropyl pendant groups, 1,1',1'',1'''-(1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetrayl)tetrakis- (propan-2-ol) ([Co(L1)]2+ , 1,1'-(4,11-dibenzyl-1,4,8,11-tetraazacyclotetradecane-1,8-diyl)bis(propan-2-ol) ([Co(L2)]2+ ), and 1,1'-(4,11-dibenzyl-1,4,8,11-tetraazacyclotetradecane-1,8-diyl)bis(octadecan-2-ol) ([Co(L3)]2+ ) were synthesized to prepare transition metal liposomal chemical exchange saturation transfer (lipoCEST) agents. In solution, ([Co(L1)]2+ ) forms two isomers as shown by 1 H NMR spectroscopy. X-ray crystallographic studies show one isomer with 1,8-pendants in cis-configuration and a second isomer with 1,4-pendants in trans-configuration. The [Co(L2)]2+ complex has 1,8-pendants in a cis-configuration. Remarkably, the paramagnetic-induced shift of water 1 H NMR resonances in the presence of the [Co(L1)]2+ complex is as large as that observed for one of the most effective LnIII water proton shift agents. Incorporation of [Co(L1)]2+ into the liposome aqueous core, followed by dialysis against a solution of 300 mOsm L-1 produces a CEST peak at 3.5 ppm. Incorporation of the amphiphilic [Co(L3)]2+ complex into the liposome bilayer produces a more highly shifted CEST peak at -13 ppm. Taken together, these data demonstrate the feasibility of preparing CoII lipoCEST agents.
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Affiliation(s)
- Samira M. Abozeid
- Department of Chemistry, University at Buffalo, the State University of New York, Amherst, NY 14260, United States
| | - Didar Asik
- Department of Chemistry, University at Buffalo, the State University of New York, Amherst, NY 14260, United States
| | - Gregory E. Sokolow
- Department of Chemistry, University at Buffalo, the State University of New York, Amherst, NY 14260, United States
| | - Jonathan F. Lovell
- Department of Biomedical Engineering, University at Buffalo, the State University of New York, Amherst, NY 14260, United States
| | - Alexander Y. Nazarenko
- Chemistry Department, SUNY College at Buffalo, 1300 Elmwood Avenue, Buffalo, NY 14222, United States
| | - Janet R. Morrow
- Department of Chemistry, University at Buffalo, the State University of New York, Amherst, NY 14260, United States
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9
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Abozeid SM, Asik D, Sokolow GE, Lovell JF, Nazarenko AY, Morrow JR. Co
II
Complexes as Liposomal CEST Agents. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202003479] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Samira M. Abozeid
- Department of Chemistry University at Buffalo, The State University of New York Amherst NY 14260 USA
| | - Didar Asik
- Department of Chemistry University at Buffalo, The State University of New York Amherst NY 14260 USA
| | - Gregory E. Sokolow
- Department of Chemistry University at Buffalo, The State University of New York Amherst NY 14260 USA
| | - Jonathan F. Lovell
- Department of Biomedical Engineering University at Buffalo The State University of New York Amherst NY 14260 USA
| | | | - Janet R. Morrow
- Department of Chemistry University at Buffalo, The State University of New York Amherst NY 14260 USA
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10
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Gupta A, Caravan P, Price WS, Platas-Iglesias C, Gale EM. Applications for Transition-Metal Chemistry in Contrast-Enhanced Magnetic Resonance Imaging. Inorg Chem 2020; 59:6648-6678. [PMID: 32367714 DOI: 10.1021/acs.inorgchem.0c00510] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Contrast-enhanced magnetic resonance imaging (MRI) is an indispensable tool for diagnostic medicine. However, safety concerns related to gadolinium in commercial MRI contrast agents have emerged in recent years. For patients suffering from severe renal impairment, there is an important unmet medical need to perform contrast-enhanced MRI without gadolinium. There are also concerns over the long-term effects of retained gadolinium within the general patient population. Demand for gadolinium-free MRI contrast agents is driving a new wave of inorganic chemistry innovation as researchers explore paramagnetic transition-metal complexes as potential alternatives. Furthermore, advances in personalized care making use of molecular-level information have motivated inorganic chemists to develop MRI contrast agents that can detect pathologic changes at the molecular level. Recent studies have highlighted how reaction-based modulation of transition-metal paramagnetism offers a highly effective mechanism to achieve MRI contrast enhancement that is specific to biochemical processes. This Viewpoint highlights how recent advances in transition-metal chemistry are leading the way for a new generation of MRI contrast agents.
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Affiliation(s)
- Abhishek Gupta
- Nanoscale Organisation and Dynamics Group, School of Science and Health, Western Sydney University, Penrith, New South Wales 2751, Australia.,Ingham Institute of Applied Medical Research, Liverpool, New South Wales 2170, Australia
| | | | - William S Price
- Nanoscale Organisation and Dynamics Group, School of Science and Health, Western Sydney University, Penrith, New South Wales 2751, Australia.,Ingham Institute of Applied Medical Research, Liverpool, New South Wales 2170, Australia
| | - Carlos Platas-Iglesias
- Centro de Investigacións Científicas Avanzadas and Departamento de Química, Facultade de Ciencias, Universidade da Coruña, A Coruña, Galicia 15071, Spain
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11
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Álvarez-Miguel L, Álvarez-Miguel I, Martín-Álvarez JM, Álvarez CM, Rogez G, García-Rodríguez R, Miguel D. Copper complexes for the promotion of iminopyridine ligands derived from β-alanine and self-aldol additions: relaxivity and cytotoxic properties. Dalton Trans 2019; 48:17544-17555. [PMID: 31748774 DOI: 10.1039/c9dt03822a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
In the study presented herein, we explore the ability of copper complexes with coordinated pyridine-2-carboxaldehyde (pyca) or 2-acetylpyridine (acepy) ligands to promote the addition of amines (Schiff condensation) and other nucleophiles such as alcohols (hemiacetal formation). Distinct reactivity patterns are observed: unlike pyca complexes, acepy copper complexes can promote self-aldol addition. The introduction of a flexible chain via Schiff condensation with β-alanine allows the possibility of chelate ring ring-opening processes mediated by pH. Further derivatization of the complex [CuCl(py-2-C(H)[double bond, length as m-dash]NCH2CH2COO)] is possible by replacing its chloride ligand with different pseudohalogens (N3-, NCO- and NCS-). In addition to the change in their magnetism, which correlates with their solid-state structures, more unexpected effects in their cytotoxicity and relaxitivities are observed, which determines their possibility to be used as MRI contrast agents. The replacement of a chloride by another pseudohalogen, although a simple strategy, can be used to critically change the cytotoxicity of the Schiff base copper(ii) complex and its selectivity towards specific cell lines.
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Affiliation(s)
- Lucía Álvarez-Miguel
- GIR MIOMET-IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belen 7, E-47011 Valladolid, Spain.
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12
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Scepaniak JJ, Kang EB, John M, Kaminsky W, Dechert S, Meyer F. Non‐Macrocyclic Schiff Base Complexes of Iron(II) as ParaCEST Agents for MRI. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201801565] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Jeremiah J. Scepaniak
- Institut für Anorganische Chemie Georg‐August‐Universität Göttingen Tammannstrasse 4 37077 Göttingen Germany
- Department of Chemistry Drexel University 32 S. 32nd St. Disque Hall 506 19104 Philadelphia PA USA
| | - Eun Byoung Kang
- Department of Chemistry Drexel University 32 S. 32nd St. Disque Hall 506 19104 Philadelphia PA USA
| | - Michael John
- Institut für Anorganische Chemie Georg‐August‐Universität Göttingen Tammannstrasse 4 37077 Göttingen Germany
| | - Werner Kaminsky
- Department of Chemistry University of Washington Box 351700 98195‐1700 Seattle WA USA
| | - Sebastian Dechert
- Institut für Anorganische Chemie Georg‐August‐Universität Göttingen Tammannstrasse 4 37077 Göttingen Germany
| | - Franc Meyer
- Institut für Anorganische Chemie Georg‐August‐Universität Göttingen Tammannstrasse 4 37077 Göttingen Germany
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13
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Du K, Thorarinsdottir AE, Harris TD. Selective Binding and Quantitation of Calcium with a Cobalt-Based Magnetic Resonance Probe. J Am Chem Soc 2019; 141:7163-7172. [PMID: 30946580 DOI: 10.1021/jacs.9b02661] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
We report a cobalt-based paramagnetic chemical exchange saturation transfer (PARACEST) magnetic resonance (MR) probe that is able to selectively bind and quantitate the concentration of Ca2+ ions under physiological conditions. The parent LCo complex features CEST-active carboxamide groups and an uncoordinated crown ether moiety in close proximity to a high-spin pseudo-octahedral CoII center. Addition of Na+, Mg2+, K+, and Ca2+ leads to binding of these metal ions within the crown ether. Single-crystal X-ray diffraction and solid-state magnetic measurements reveal the presence of a cation-specific coordination environment and magnetic anisotropy of CoII, with axial zero-field splitting parameters for the Na+- and Ca2+-bound complexes differing by over 90%. Owing to these differences, solution-based measurements under physiological conditions indicate reversible binding of Na+ and Ca2+ to give well-separated CEST peaks at 69 and 80 ppm for [LCoNa]+ and [LCoCa]2+, respectively. Dissociation constants for different cation-bound complexes of LCo, as determined by 1H NMR spectroscopy, demonstrate high selectivity toward Ca2+. This finding, in conjunction with the large excess of Na+ in physiological environments, minimizes interference from related cations, such as Mg2+ and K+. Finally, variable-[Ca2+] CEST spectra establish the ratio between the CEST peak intensities for the Ca2+- and Na+-bound probes (CEST80 ppm/CEST69 ppm) as a measure of [Ca2+], providing the first example of a ratiometric quantitation of Ca2+ concentration using PARACEST. Taken together, these results demonstrate the ability of transition metal PARACEST probes to afford a concentration-independent measure of [Ca2+] and provide a new approach for designing MR probes for cation sensing.
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Affiliation(s)
- Kang Du
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208-3113 , United States
| | - Agnes E Thorarinsdottir
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208-3113 , United States
| | - T David Harris
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208-3113 , United States
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14
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Greenfield TJ, Julve M, Doyle RP. Exploring the biological, catalytic, and magnetic properties of transition metal coordination complexes incorporating pyrophosphate. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2018.12.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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15
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Corbin BA, Pollard AC, Allen MJ, Pagel MD. Summary of Imaging in 2020: Visualizing the Future of Healthcare with MR Imaging. Mol Imaging Biol 2019; 21:193-199. [PMID: 30680525 PMCID: PMC6450763 DOI: 10.1007/s11307-019-01315-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The Imaging in 2020 meeting convenes biannually to discuss innovations in medical imaging. The 2018 meeting, titled "Visualizing the Future of Healthcare with MR Imaging," sought to encourage discussions of the future goals of MRI research, feature important discoveries, and foster scientific discourse between scientists from a variety of fields of expertise. Here, we highlight presented research and resulting discussions of the meeting.
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Affiliation(s)
- Brooke A Corbin
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI, USA
| | - Alyssa C Pollard
- Department of Chemistry, Rice University, 6100 S Main Street, Houston, TX, USA
- Department of Cancer Systems Imaging, The University of Texas MD Anderson Cancer Center, 1881 East Road, Houston, TX, USA
| | - Matthew J Allen
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI, USA.
| | - Mark D Pagel
- Department of Chemistry, Rice University, 6100 S Main Street, Houston, TX, USA.
- Department of Cancer Systems Imaging, The University of Texas MD Anderson Cancer Center, 1881 East Road, Houston, TX, USA.
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16
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Wahsner J, Gale EM, Rodríguez-Rodríguez A, Caravan P. Chemistry of MRI Contrast Agents: Current Challenges and New Frontiers. Chem Rev 2019; 119:957-1057. [PMID: 30350585 PMCID: PMC6516866 DOI: 10.1021/acs.chemrev.8b00363] [Citation(s) in RCA: 849] [Impact Index Per Article: 169.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Tens of millions of contrast-enhanced magnetic resonance imaging (MRI) exams are performed annually around the world. The contrast agents, which improve diagnostic accuracy, are almost exclusively small, hydrophilic gadolinium(III) based chelates. In recent years concerns have arisen surrounding the long-term safety of these compounds, and this has spurred research into alternatives. There has also been a push to develop new molecularly targeted contrast agents or agents that can sense pathological changes in the local environment. This comprehensive review describes the state of the art of clinically approved contrast agents, their mechanism of action, and factors influencing their safety. From there we describe different mechanisms of generating MR image contrast such as relaxation, chemical exchange saturation transfer, and direct detection and the types of molecules that are effective for these purposes. Next we describe efforts to make safer contrast agents either by increasing relaxivity, increasing resistance to metal ion release, or by moving to gadolinium(III)-free alternatives. Finally we survey approaches to make contrast agents more specific for pathology either by direct biochemical targeting or by the design of responsive or activatable contrast agents.
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Affiliation(s)
- Jessica Wahsner
- Athinoula A. Martinos Center for Biomedical Imaging and the Institute for Innovation in Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA 02129, USA
| | - Eric M. Gale
- Athinoula A. Martinos Center for Biomedical Imaging and the Institute for Innovation in Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA 02129, USA
| | - Aurora Rodríguez-Rodríguez
- Athinoula A. Martinos Center for Biomedical Imaging and the Institute for Innovation in Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA 02129, USA
| | - Peter Caravan
- Athinoula A. Martinos Center for Biomedical Imaging and the Institute for Innovation in Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA 02129, USA
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17
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Thorarinsdottir AE, Tatro SM, Harris TD. Electronic Effects of Ligand Substitution in a Family of CoII2 PARACEST pH Probes. Inorg Chem 2018; 57:11252-11263. [DOI: 10.1021/acs.inorgchem.8b01896] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
| | - Scott M. Tatro
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - T. David Harris
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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18
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Dastrù W, Menchise V, Ferrauto G, Fabretto S, Carrera C, Terreno E, Aime S, Castelli DD. Modulation of the Prototropic Exchange Rate in pH-Responsive Yb-HPDO3A Derivatives as ParaCEST Agents. ChemistrySelect 2018. [DOI: 10.1002/slct.201800283] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Walter Dastrù
- Department of Molecular Biotechnology and Health Sciences; Molecular Imaging Center; University of Torino; Via Nizza 52 10126 Torino Italy
| | - Valeria Menchise
- Istituto di Biostrutture e Bioimmagini; Consiglio Nazionale delle Ricerche; via Mezzocannone 16 80134 Napoli Italy
| | - Giuseppe Ferrauto
- Department of Molecular Biotechnology and Health Sciences; Molecular Imaging Center; University of Torino; Via Nizza 52 10126 Torino Italy
| | - Serena Fabretto
- Department of Molecular Biotechnology and Health Sciences; Molecular Imaging Center; University of Torino; Via Nizza 52 10126 Torino Italy
| | - Carla Carrera
- Department of Molecular Biotechnology and Health Sciences; Molecular Imaging Center; University of Torino; Via Nizza 52 10126 Torino Italy
| | - Enzo Terreno
- Department of Molecular Biotechnology and Health Sciences; Molecular Imaging Center; University of Torino; Via Nizza 52 10126 Torino Italy
| | - Silvio Aime
- Department of Molecular Biotechnology and Health Sciences; Molecular Imaging Center; University of Torino; Via Nizza 52 10126 Torino Italy
| | - Daniela Delli Castelli
- Department of Molecular Biotechnology and Health Sciences; Molecular Imaging Center; University of Torino; Via Nizza 52 10126 Torino Italy
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19
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Lilley LM, Du K, Krzyaniak MD, Parigi G, Luchinat C, Harris TD, Meade TJ. Effect of Magnetic Coupling on Water Proton Relaxivity in a Series of Transition Metal Gd III Complexes. Inorg Chem 2018; 57:5810-5819. [PMID: 29714477 DOI: 10.1021/acs.inorgchem.8b00120] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A fundamental challenge in the design of bioresponsive (or bioactivated) GdIII-based magnetic resonance (MR) imaging probes is the considerable background signal present in the "preactivated" state that arises from outer-sphere relaxation processes. When sufficient concentrations of a bioresponsive agent are present (i.e., a detectable signal in the image), the inner- and outer-sphere contributions to r1 may be misinterpreted to conclude that the agent has been activated, when it has not. Of the several parameters that determine the observed MR signal of an agent, only the electron relaxation time ( T1e) impacts both the inner- and outer-sphere relaxation. Therefore, strategies to minimize this background signal must be developed to create a near zero-background (or truly "off" state) of the agent. Here, we demonstrate that intramolecular magnetic exchange coupling when GdIII is coupled to a paramagnetic transition metal provides a means to overcome the contribution of second- and outer-sphere contributions to the observed relaxivity. We have prepared a series of complexes with the general formula LMLn(μ-O2CCH3)(O2CCH3)2 (M = Co, Cu, Zn). Solid-state magnetic susceptibility measurements reveal significant magnetic coupling between GdIII and the transition metal ion. Nuclear magnetic relaxation dispersion (NMRD) analysis confirms that the observed differences in relaxivity are associated with the modulation of T1e at GdIII. These results clearly demonstrate that magnetic exchange coupling between GdIII and a transition metal ion can provide a significant decrease in T1e (and therefore the relaxivity of GdIII). This design strategy is being exploited to prepare new generations of preclinical bioresponsive MR imaging probes with near zero-background.
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Affiliation(s)
| | | | | | - Giacomo Parigi
- Department of Chemistry and Magnetic Resonance Center (CERM) , University of Florence , Via L. Sacconi 6 , 50019 Sesto Fiorentino , Italy
| | - Claudio Luchinat
- Department of Chemistry and Magnetic Resonance Center (CERM) , University of Florence , Via L. Sacconi 6 , 50019 Sesto Fiorentino , Italy
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20
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Abozeid SM, Snyder EM, Tittiris TY, Steuerwald CM, Nazarenko AY, Morrow JR. Inner-Sphere and Outer-Sphere Water Interactions in Co(II) paraCEST Agents. Inorg Chem 2018; 57:2085-2095. [DOI: 10.1021/acs.inorgchem.7b02977] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Samira M. Abozeid
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, New York 14260, United States
| | - Eric M. Snyder
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, New York 14260, United States
| | - Timothy Y. Tittiris
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, New York 14260, United States
| | - Charles M. Steuerwald
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, New York 14260, United States
| | - Alexander Y. Nazarenko
- Chemistry Department, SUNY College at Buffalo, 1300 Elmwood Avenue, Buffalo, New York 14222, United States
| | - Janet R. Morrow
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, New York 14260, United States
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21
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Thorarinsdottir AE, Du K, Collins JHP, Harris TD. Ratiometric pH Imaging with a CoII2 MRI Probe via CEST Effects of Opposing pH Dependences. J Am Chem Soc 2017; 139:15836-15847. [DOI: 10.1021/jacs.7b08574] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
| | - Kang Du
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - James H. P. Collins
- Advanced
Magnetic Resonance Imaging and Spectroscopy Facility, University of Florida, Gainesville, Florida 32611, United States
| | - T. David Harris
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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22
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Singh J, Rustagi V, Zhang S, Sherry AD, Udugamasooriya DG. On-bead combinatorial synthesis and imaging of europium(III)-based paraCEST agents aids in identification of chemical features that enhance CEST sensitivity. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2017; 55:747-753. [PMID: 28220538 PMCID: PMC5501467 DOI: 10.1002/mrc.4588] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Revised: 02/15/2017] [Accepted: 02/16/2017] [Indexed: 05/08/2023]
Abstract
The rate of water exchange between the inner sphere of a paramagnetic ion and bulk water is an important parameter in determining the magnitude of the chemical exchange saturation transfer signal from paramagnetic CEST agents (paraCEST). This is governed by various geometric, steric and ligand field factors created by macrocyclic ligands surrounding the paramagnetic metal ion. Our previous on-bead combinatorial studies of di-peptoid-europium(III)-1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA)-tetraamide complexes revealed that negatively charged groups in the immediate vicinity of the metal center strongly enhances the CEST signal. Here, we report a solid phase synthesis and on-bead imaging of 76 new DOTA derivatives that are developed by coupling with a single residue onto each of the three arms of a DOTA-tetraamide scaffold attached to resin beads. This single residue predominantly carries negatively charged groups blended with various physico-chemical characteristics. We found that non-bulky negatively charged groups are best suited at the immediate vicinity of the metal ion, while positive, bulky and halogen containing moieties suppress the CEST signal. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- Jaspal Singh
- Department of Pharmacological and Pharmaceutical Sciences, University of Houston, 3455 Cullen Blvd, Houston, TX, 77204-5037, USA
| | - Vineeta Rustagi
- Department of Pharmacological and Pharmaceutical Sciences, University of Houston, 3455 Cullen Blvd, Houston, TX, 77204-5037, USA
| | - Shanrong Zhang
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, 75390-8568, USA
| | - A Dean Sherry
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, 75390-8568, USA
- Department of Chemistry, University of Texas at Dallas, 800 West Campbell Rd, Richardson, TX, 75083-3021, USA
| | - D Gomika Udugamasooriya
- Department of Pharmacological and Pharmaceutical Sciences, University of Houston, 3455 Cullen Blvd, Houston, TX, 77204-5037, USA
- Department of Cancer Systems Imaging, MD Anderson Cancer Center, 1881 East Road, Houston, TX, 77030-4009, USA
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23
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Affiliation(s)
- Janet R. Morrow
- Department of Chemistry, University at Buffalo, The State University of New York, Amherst, New York 14260, United States
| | - Éva Tóth
- Centre de Biophysique
Moléculaire, CNRS UPR 4301, Université d’Orléans, Rue Charles Sadron, 45071 Orléans 2, France
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24
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Du K, Waters EA, Harris TD. Ratiometric quantitation of redox status with a molecular Fe 2 magnetic resonance probe. Chem Sci 2017; 8:4424-4430. [PMID: 28979760 PMCID: PMC5580376 DOI: 10.1039/c7sc00562h] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 04/10/2017] [Indexed: 12/12/2022] Open
Abstract
We demonstrate the ability of a molecular Fe2 complex to enable magnetic resonance (MR)-based ratiometric quantitation of redox status, namely through redox-dependent paramagnetic chemical exchange saturation transfer (PARACEST). Metalation of a tetra(carboxamide) ligand with FeII and/or FeIII in the presence of etidronate ion affords analogous FeII2, FeIIFeIII, and FeIII2 complexes. Both FeII2 and FeIIFeIII complexes give highly-shifted, sharp, and non-overlapping NMR spectra, with multiple resonances for each complex corresponding to exchangeable carboxamide protons. These protons can be selectively irradiated to give CEST peaks at 74 and 83 ppm vs. H2O for the FeIIFeIII complex and at 29, 40 and 68 ppm for the FeII2 complex. The CEST spectra obtained from a series of samples containing mixtures of FeII2 and FeIIFeIII are correlated with independently-determined open-circuit potentials to construct a Nernstian calibration curve of potential vs. CEST peak intensity ratio. In addition, averaged intensities of phantom images collected on a 9.4 T MRI scanner show analogous Nernstian behavior. Finally, both the FeII2 and FeIIFeIII forms of the complex are stable to millimolar concentrations of H2PO4-/HPO42-, CO32-, SO42-, CH3COO-, and Ca2+ ions, and the FeIII2 form is air-stable in aqueous buffer and shows >80% viability in melanoma cells at millimolar concentration. The stability suggests the possible application of this or related complexes for in vivo studies. To our knowledge, this concentration-independent method based on a single Fe2 probe provides the first example of MR-based ratiometric quantitation of redox environment.
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Affiliation(s)
- Kang Du
- Department of Chemistry , Northwestern University , 2145 Sheridan Road , Evanston , IL 60208-3113 , USA .
| | - Emily A Waters
- Center for Advanced Molecular Imaging , Northwestern University , 2145 Sheridan Road , Evanston , IL 60208-3113 , USA
| | - T David Harris
- Department of Chemistry , Northwestern University , 2145 Sheridan Road , Evanston , IL 60208-3113 , USA .
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25
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Xie D, Kim S, Kohli V, Banerjee A, Yu M, Enriquez JS, Luci JJ, Que EL. Hypoxia-Responsive 19F MRI Probes with Improved Redox Properties and Biocompatibility. Inorg Chem 2017; 56:6429-6437. [PMID: 28537705 DOI: 10.1021/acs.inorgchem.7b00500] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
19F magnetic resonance imaging (MRI), an emerging modality in biomedical imaging, has shown promise for in vitro and in vivo preclinical studies. Here we present a series of fluorinated Cu(II)ATSM derivatives for potential use as 19F magnetic resonance agents for sensing cellular hypoxia. The synthesized complexes feature a hypoxia-targeting Cu2+ coordination core, nine equivalent fluorine atoms connected via a variable-length poly(ethylene glycol) linker. Introduction of the fluorine moiety maintains the planar coordination geometry of the Cu2+ center, while the linker length modulates the Cu2+/+ reduction potential, 19F NMR relaxation properties, and lipophilicity. In particular, the 19F NMR relaxation properties were quantitatively evaluated by the Solomon-Bloembergen model, revealing a regular pattern of relaxation enhancement tuned by the distance between Cu2+ and F atoms. Finally, the potential utility of these complexes for sensing reductive environments was demonstrated using both 19F MR phantom imaging and 19F NMR, including experiments in intact live cells.
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Affiliation(s)
- Da Xie
- Department of Chemistry, The University of Texas at Austin , 105 E. 24th Street Stop A5300, Austin, Texas 78712, United States
| | - Seyong Kim
- Department of Chemistry, The University of Texas at Austin , 105 E. 24th Street Stop A5300, Austin, Texas 78712, United States
| | - Vikraant Kohli
- Department of Chemistry, The University of Texas at Austin , 105 E. 24th Street Stop A5300, Austin, Texas 78712, United States
| | - Arnab Banerjee
- Department of Chemistry, The University of Texas at Austin , 105 E. 24th Street Stop A5300, Austin, Texas 78712, United States
| | - Meng Yu
- Department of Chemistry, The University of Texas at Austin , 105 E. 24th Street Stop A5300, Austin, Texas 78712, United States
| | - José S Enriquez
- Department of Chemistry, The University of Texas at Austin , 105 E. 24th Street Stop A5300, Austin, Texas 78712, United States
| | - Jeffrey J Luci
- Department of Neuroscience, The University of Texas at Austin , Austin, Texas 78712, United States.,Imaging Research Center, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Emily L Que
- Department of Chemistry, The University of Texas at Austin , 105 E. 24th Street Stop A5300, Austin, Texas 78712, United States
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26
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Song B, Zhong Y, Wang H, Su Y, He Y. One-dimensional silicon nanoshuttles simultaneously featuring fluorescent and magnetic properties. Chem Commun (Camb) 2017; 53:6957-6960. [DOI: 10.1039/c7cc02964k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorescent and magnetic one-dimensional silicon nanoshuttles are prepared in situ through a metal ions-assisted microwave synthetic strategy.
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Affiliation(s)
- Bin Song
- Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices
- Institute of Functional Nano & Soft Materials (FUNSOM), and Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC)
- Soochow University
- Suzhou
- China
| | - Yiling Zhong
- Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices
- Institute of Functional Nano & Soft Materials (FUNSOM), and Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC)
- Soochow University
- Suzhou
- China
| | - Houyu Wang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices
- Institute of Functional Nano & Soft Materials (FUNSOM), and Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC)
- Soochow University
- Suzhou
- China
| | - Yuanyuan Su
- Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices
- Institute of Functional Nano & Soft Materials (FUNSOM), and Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC)
- Soochow University
- Suzhou
- China
| | - Yao He
- Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices
- Institute of Functional Nano & Soft Materials (FUNSOM), and Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC)
- Soochow University
- Suzhou
- China
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