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Mason K, Rogers NJ, Suturina EA, Kuprov I, Aguilar JA, Batsanov AS, Yufit DS, Parker D. PARASHIFT Probes: Solution NMR and X-ray Structural Studies of Macrocyclic Ytterbium and Yttrium Complexes. Inorg Chem 2017; 56:4028-4038. [DOI: 10.1021/acs.inorgchem.6b02291] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Kevin Mason
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
| | - Nicola J. Rogers
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
| | - Elizaveta A. Suturina
- School
of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K
| | - Ilya Kuprov
- School
of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K
| | - Juan A. Aguilar
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
| | - Andrei S. Batsanov
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
| | - Dmitry S. Yufit
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
| | - David Parker
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, U.K
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52
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Thorarinsdottir AE, Gaudette AI, Harris TD. Spin-crossover and high-spin iron(ii) complexes as chemical shift 19F magnetic resonance thermometers. Chem Sci 2017; 8:2448-2456. [PMID: 28694955 PMCID: PMC5477811 DOI: 10.1039/c6sc04287b] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2016] [Accepted: 12/20/2016] [Indexed: 12/22/2022] Open
Abstract
The potential utility of paramagnetic transition metal complexes as chemical shift 19F magnetic resonance (MR) thermometers is demonstrated. Further, spin-crossover FeII complexes are shown to provide much higher temperature sensitivity than do the high-spin analogues, owing to the variation of spin state with temperature in the former complexes. This approach is illustrated through a series of FeII complexes supported by symmetrically and asymmetrically substituted 1,4,7-triazacyclononane ligand scaffolds bearing 3-fluoro-2-picolyl derivatives as pendent groups (L x ). Variable-temperature magnetic susceptibility measurements, in conjunction with UV-vis and NMR data, show thermally-induced spin-crossover for [Fe(L1)]2+ in H2O, with T1/2 = 52(1) °C. Conversely, [Fe(L2)]2+ remains high-spin in the temperature range 4-61 °C. Variable-temperature 19F NMR spectra reveal the chemical shifts of the complexes to exhibit a linear temperature dependence, with the two peaks of the spin-crossover complex providing temperature sensitivities of +0.52(1) and +0.45(1) ppm per °C in H2O. These values represent more than two-fold higher sensitivity than that afforded by the high-spin analogue, and ca. 40-fold higher sensitivity than diamagnetic perfluorocarbon-based thermometers. Finally, these complexes exhibit excellent stability in a physiological environment, as evidenced by 19F NMR spectra collected in fetal bovine serum.
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Affiliation(s)
- Agnes E Thorarinsdottir
- Department of Chemistry , Northwestern University , 2145 Sheridan Road , Evanston , IL 60208-3113 , USA .
| | - Alexandra I Gaudette
- Department of Chemistry , 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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53
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Srivastava K, Weitz EA, Peterson KL, Marjańska M, Pierre VC. Fe- and Ln-DOTAm-F12 Are Effective Paramagnetic Fluorine Contrast Agents for MRI in Water and Blood. Inorg Chem 2017; 56:1546-1557. [PMID: 28094930 DOI: 10.1021/acs.inorgchem.6b02631] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A series of fluorinated macrocyclic complexes, M-DOTAm-F12, where M is LaIII, EuIII, GdIII, TbIII, DyIII, HoIII, ErIII, TmIII, YbIII, and FeII, was synthesized, and their potential as fluorine magnetic resonance imaging (MRI) contrast agents was evaluated. The high water solubility of these complexes and the presence of a single fluorine NMR signal, two necessary parameters for in vivo MRI, are substantial advantages over currently used organic polyfluorocarbons and other reported paramagnetic 19F probes. Importantly, the sensitivity of the paramagnetic probes on a per fluorine basis is at least 1 order of magnitude higher than that of diamagnetic organic probes. This increased sensitivity is due to a substantial-up to 100-fold-decrease in the longitudinal relaxation time (T1) of the fluorine nuclei. The shorter T1 allows for a greater number of scans to be obtained in an equivalent time frame. The sensitivity of the fluorine probes is proportional to the T2/T1 ratio. In water, the optimal metal complexes for imaging applications are those containing HoIII and FeII, and to a lesser extent TmIII and YbIII. Whereas T1 of the lanthanide complexes are little affected by blood, the T2 are notably shorter in blood than in water. The sensitivity of Ln-DOTAm-F12 complexes is lower in blood than in water, such that the most sensitive complex in water, HoIII-DOTAm-F12, could not be detected in blood. TmIII yielded the most sensitive lanthanide fluorine probe in blood. Notably, the relaxation times of the fluorine nuclei of FeII-DOTAm-F12 are similar in water and in blood. That complex has the highest T2/T1 ratio (0.57) and the lowest limit of detection (300 μM) in blood. The combination of high water solubility, single fluorine signal, and high T2/T1 of M-DOTAm-F12 facilitates the acquisition of three-dimensional magnetic resonance images.
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Affiliation(s)
- Kriti Srivastava
- Department of Chemistry and ‡Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota , Minneapolis, Minnesota 55455, United States
| | - Evan A Weitz
- Department of Chemistry and ‡Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota , Minneapolis, Minnesota 55455, United States
| | - Katie L Peterson
- Department of Chemistry and ‡Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota , Minneapolis, Minnesota 55455, United States
| | - Małgorzata Marjańska
- Department of Chemistry and ‡Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota , Minneapolis, Minnesota 55455, United States
| | - Valérie C Pierre
- Department of Chemistry and ‡Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota , Minneapolis, Minnesota 55455, United States
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54
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Gaudette AI, Thorarinsdottir AE, Harris TD. pH-Dependent spin state population and 19F NMR chemical shift via remote ligand protonation in an iron(ii) complex. Chem Commun (Camb) 2017; 53:12962-12965. [DOI: 10.1039/c7cc08158h] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
An FeII complex that features a pH-dependent spin state population and 19F chemical shift, by virtue of a variable ligand protonation state, is described.
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55
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O’Neill ES, Kolanowski JL, Bonnitcha PD, New EJ. A cobalt(ii) complex with unique paraSHIFT responses to anions. Chem Commun (Camb) 2017; 53:3571-3574. [DOI: 10.1039/c7cc00619e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
A cobalt(ii) complex can distinguish between anions by observing the paramagnetic 1H NMR shift.
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Affiliation(s)
- E. S. O’Neill
- School of Chemistry
- The University of Sydney
- Australia
| | | | - P. D. Bonnitcha
- Sydney Medical School
- Royal North Shore Hospital
- St. Leonards
- Australia
| | - E. J. New
- School of Chemistry
- The University of Sydney
- Australia
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56
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Preslar AT, Tantakitti F, Park K, Zhang S, Stupp SI, Meade TJ. (19)F Magnetic Resonance Imaging Signals from Peptide Amphiphile Nanostructures Are Strongly Affected by Their Shape. ACS NANO 2016; 10:7376-84. [PMID: 27425636 PMCID: PMC5036169 DOI: 10.1021/acsnano.6b00267] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Magnetic resonance imaging (MRI) is a noninvasive imaging modality that provides excellent spatial and temporal resolution. The most commonly used MR probes face significant challenges originating from the endogenous (1)H background signal of water. In contrast, fluorine MRI ((19)F MRI) allows quantitative probe imaging with zero background signal. Probes with high fluorine content are required for high sensitivity, suggesting nanoscale supramolecular assemblies containing (19)F probes offer a potentially useful strategy for optimum imaging as a result of improved payload. We report here on supramolecular nanostructures formed by fluorinated peptide amphiphiles containing either glutamic acid or lysine residues in their sequence. We identified molecules that form aggregates in water which transition from cylindrical to ribbon-like shape as pH increased from 4.5 to 8.0. Interestingly, we found that ribbon-like nanostructures had reduced magnetic resonance signal, whereas their cylindrical counterparts exhibited strong signals. We attribute this drastic difference to the greater mobility of fluorinated tails in the hydrophobic compartment of cylindrical nanostructures compared to lower mobility in ribbon-like assemblies. This discovery identifies a strategy to design supramolecular, self-assembling contrast agents for (19)F MRI that can spatially map physiologically relevant changes in pH using changes in morphology.
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Affiliation(s)
- Adam T. Preslar
- Departments of Chemistry, Materials Science and Engineering, Medicine, and Biomedical Engineering, and Simpson Querrey Institute for BioNanotechnology, Northwestern University, Evanston, Illinois 60208, United States
- Departments of Chemistry, Molecular Biosciences, Neurobiology and Radiology, Northwestern University, Evanston, Illinois 60208, United States
| | - Faifan Tantakitti
- Departments of Chemistry, Materials Science and Engineering, Medicine, and Biomedical Engineering, and Simpson Querrey Institute for BioNanotechnology, Northwestern University, Evanston, Illinois 60208, United States
| | - Kitae Park
- Departments of Chemistry, Molecular Biosciences, Neurobiology and Radiology, Northwestern University, Evanston, Illinois 60208, United States
| | - Shanrong Zhang
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
| | - Samuel I. Stupp
- Departments of Chemistry, Materials Science and Engineering, Medicine, and Biomedical Engineering, and Simpson Querrey Institute for BioNanotechnology, Northwestern University, Evanston, Illinois 60208, United States
- Corresponding Authors:.
| | - Thomas J. Meade
- Departments of Chemistry, Molecular Biosciences, Neurobiology and Radiology, Northwestern University, Evanston, Illinois 60208, United States
- Corresponding Authors:.
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Kenny GD, Shaw KP, Sivachelvam S, White AJ, Botnar RM, T.M. de Rosales R. A bisphosphonate for 19F-magnetic resonance imaging. J Fluor Chem 2016; 184:58-64. [PMID: 27110036 PMCID: PMC4834630 DOI: 10.1016/j.jfluchem.2016.02.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2015] [Revised: 02/20/2016] [Accepted: 02/24/2016] [Indexed: 12/15/2022]
Abstract
19F-magnetic resonance imaging (MRI) is a promising technique that may allow us to measure the concentration of exogenous fluorinated imaging probes quantitatively in vivo. Here, we describe the synthesis and characterisation of a novel geminal bisphosphonate (19F-BP) that contains chemically-equivalent fluorine atoms that show a single and narrow 19F resonance and a bisphosphonate group that may be used for labelling inorganic materials based in calcium phosphates and metal oxides. The potential of 19F-BP to provide contrast was analysed in vitro and in vivo using 19F-MRI. In vitro studies demonstrated the potential of 19F-BP as an MRI contrast agent in the millimolar concentration range with signal-to-noise ratios (SNR) comparable to previously reported fluorinated probes. The preliminary in vivo MRI study reported here allowed us to visualise the biodistribution of 19F-BP, showing uptake in the liver and in the bladder/urinary system areas. However, bone uptake was not observed. In addition, 19F-BP showed undesirable toxicity effects in mice that prevent further studies with this compound at the required concentrations for MRI contrast. This study highlights the importance of developing 19F MRI probes with the highest signal intensity achievable.
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Affiliation(s)
- Gavin D. Kenny
- Division of Imaging Sciences & Biomedical Engineering, King’s College London, St Thomas’ Hospital, London SE1 7EH, UK
| | - Karen P. Shaw
- Division of Imaging Sciences & Biomedical Engineering, King’s College London, St Thomas’ Hospital, London SE1 7EH, UK
| | - Saranja Sivachelvam
- Division of Imaging Sciences & Biomedical Engineering, King’s College London, St Thomas’ Hospital, London SE1 7EH, UK
| | - Andrew J.P. White
- Department of Chemistry, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ, UK
| | - Rene M. Botnar
- Division of Imaging Sciences & Biomedical Engineering, King’s College London, St Thomas’ Hospital, London SE1 7EH, UK
| | - Rafael T.M. de Rosales
- Division of Imaging Sciences & Biomedical Engineering, King’s College London, St Thomas’ Hospital, London SE1 7EH, UK
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Senanayake PK, Rogers NJ, Finney KLNA, Harvey P, Funk AM, Wilson JI, O'Hogain D, Maxwell R, Parker D, Blamire AM. A new paramagnetically shifted imaging probe for MRI. Magn Reson Med 2016; 77:1307-1317. [PMID: 26922918 PMCID: PMC5324534 DOI: 10.1002/mrm.26185] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Revised: 02/02/2016] [Accepted: 02/05/2016] [Indexed: 12/16/2022]
Abstract
PURPOSE To develop and characterize a new paramagnetic contrast agent for molecular imaging by MRI. METHODS A contrast agent was developed for direct MRI detection through the paramagnetically shifted proton magnetic resonances of two chemically equivalent tert-butyl reporter groups within a dysprosium(III) complex. The complex was characterized in phantoms and imaged in physiologically intact mice at 7 Tesla (T) using three-dimensional (3D) gradient echo and spectroscopic imaging (MRSI) sequences to measure spatial distribution and signal frequency. RESULTS The reporter protons reside ∼6.5 Å from the paramagnetic center, resulting in fast T1 relaxation (T1 = 8 ms) and a large paramagnetic frequency shift exceeding 60 ppm. Fast relaxation allowed short scan repetition times with high excitation flip angle, resulting in high sensitivity. The large dipolar shift allowed direct frequency selective excitation and acquisition of the dysprosium(III) complex, independent of the tissue water signal. The biokinetics of the complex were followed in vivo with a temporal resolution of 62 s following a single, low-dose intravenous injection. The lower concentration limit for detection was ∼23 μM. Through MRSI, the temperature dependence of the paramagnetic shift (0.28 ppm.K-1 ) was exploited to examine tissue temperature variation. CONCLUSIONS These data demonstrate a new MRI agent with the potential for physiological monitoring by MRI. Magn Reson Med 77:1307-1317, 2017. © 2016 The Authors Magnetic Resonance in Medicine published by Wiley Periodicals, Inc. on behalf of International Society for Magnetic Resonance in Medicine. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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Affiliation(s)
| | - Nicola J Rogers
- Dept. of Chemistry, Durham University, South Road, Durham, United Kingdom
| | | | - Peter Harvey
- Dept. of Chemistry, Durham University, South Road, Durham, United Kingdom
| | - Alexander M Funk
- Dept. of Chemistry, Durham University, South Road, Durham, United Kingdom
| | - J Ian Wilson
- Northern Institute for Cancer Research, Newcastle University, United Kingdom
| | - Dara O'Hogain
- Institute of Cellular Medicine & Newcastle MR Centre, Newcastle University, United Kingdom
| | - Ross Maxwell
- Northern Institute for Cancer Research, Newcastle University, United Kingdom
| | - David Parker
- Dept. of Chemistry, Durham University, South Road, Durham, United Kingdom
| | - Andrew M Blamire
- Institute of Cellular Medicine & Newcastle MR Centre, Newcastle University, United Kingdom
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59
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Tsitovich PB, Cox JM, Benedict JB, Morrow JR. Six-coordinate Iron(II) and Cobalt(II) paraSHIFT Agents for Measuring Temperature by Magnetic Resonance Spectroscopy. Inorg Chem 2016; 55:700-16. [PMID: 26716610 PMCID: PMC5555598 DOI: 10.1021/acs.inorgchem.5b02144] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Paramagnetic Fe(II) and Co(II) complexes are utilized as the first transition metal examples of (1)H NMR shift agents (paraSHIFT) for thermometry applications using Magnetic Resonance Spectroscopy (MRS). The coordinating ligands consist of TACN (1,4,7-triazacyclononane) and CYCLEN (1,4,7,10-tetraazacyclododecane) azamacrocycles appended with 6-methyl-2-picolyl groups, denoted as MPT and TMPC, respectively. (1)H NMR spectra of the MPT- and TMPC-based Fe(II) and Co(II) complexes demonstrate narrow and highly shifted resonances that are dispersed as broadly as 440 ppm. The six-coordinate complex cations, [M(MPT)](2+) and [M(TMPC)](2+), vary from distorted octahedral to distorted trigonal prismatic geometries, respectively, and also demonstrate that 6-methyl-2-picolyl pendents control the rigidity of these complexes. Analyses of the (1)H NMR chemical shifts, integrated intensities, line widths, the distances obtained from X-ray diffraction measurements, and longitudinal relaxation time (T1) values allow for the partial assignment of proton resonances of the [M(MPT)](2+) complexes. Nine and six equivalent methyl protons of [M(MPT)](2+) and [M(TMPC)](2+), respectively, produce 3-fold higher (1)H NMR intensities compared to other paramagnetically shifted proton resonances. Among all four complexes, the methyl proton resonances of [Fe(TMPC)](2+) and [Co(TMPC)](2+) at -49.3 ppm and -113.7 ppm (37 °C) demonstrate the greatest temperature dependent coefficients (CT) of 0.23 ppm/°C and 0.52 ppm/°C, respectively. The methyl groups of these two complexes both produce normalized values of |CT|/fwhm = 0.30 °C(-1), where fwhm is full width at half-maximum (Hz) of proton resonances. The T1 values of the highly shifted methyl protons are in the range of 0.37-2.4 ms, allowing rapid acquisition of spectroscopic data. These complexes are kinetically inert over a wide range of pH values (5.6-8.6), as well as in the presence of serum albumin and biologically relevant cations and anions. The combination of large hyperfine shifts, large temperature sensitivity, increased signal-to-noise ratio, and short T1 values suggests that these complexes, in particular the TMPC-based complexes, show promise as paraSHIFT agents for thermometry.
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Affiliation(s)
- Pavel B. Tsitovich
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, NY 14260
| | - Jordan M. Cox
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, NY 14260
| | - Jason B. Benedict
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, NY 14260
| | - Janet R. Morrow
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, NY 14260
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61
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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] [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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Černoch P, Černochová Z, Petrova S, Kaňková D, Kim JS, Vasu V, Asandei AD. Water soluble poly(styrene sulfonate)-b-poly(vinylidene fluoride)-b-poly(styrene sulfonate) triblock copolymer nanoparticles. RSC Adv 2016. [DOI: 10.1039/c6ra10241g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Water-soluble PNaSS-b-PVDF-b-PNaSS triblock copolymer.
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Affiliation(s)
- Peter Černoch
- Institute of Macromolecular Chemistry
- Academy of Sciences of the Czech Republic v.v.i
- 162 06 Prague 6
- Czech Republic
| | - Zulfiya Černochová
- Institute of Macromolecular Chemistry
- Academy of Sciences of the Czech Republic v.v.i
- 162 06 Prague 6
- Czech Republic
| | - Svetlana Petrova
- Institute of Macromolecular Chemistry
- Academy of Sciences of the Czech Republic v.v.i
- 162 06 Prague 6
- Czech Republic
| | - Dana Kaňková
- Institute of Macromolecular Chemistry
- Academy of Sciences of the Czech Republic v.v.i
- 162 06 Prague 6
- Czech Republic
| | - Joon-Sung Kim
- Institute of Materials Science
- Department of Chemistry
- University of Connecticut
- Storrs
- USA
| | - Vignesh Vasu
- Institute of Materials Science
- Department of Chemistry
- University of Connecticut
- Storrs
- USA
| | - Alexandru D. Asandei
- Institute of Materials Science
- Department of Chemistry
- University of Connecticut
- Storrs
- USA
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63
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Davies GL, Brown A, Blackburn O, Tropiano M, Faulkner S, Beer PD, Davis JJ. Ligation driven (19)F relaxation enhancement in self-assembled Ln(III) complexes. Chem Commun (Camb) 2015; 51:2918-20. [PMID: 25586055 DOI: 10.1039/c4cc09952d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Strong bidentate ligation between a fluorinated isophthalate and binuclear lanthanide-DO3A species yields a new class of (19)F NMR agent with very high nuclear relaxation rates at physiologically-relevant pH.
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Affiliation(s)
- Gemma-Louise Davies
- Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK.
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Abstract
Molecular imaging plays an important role in the era of personalized medicine, especially with recent advances in magnetic resonance (MR) probes. While the first generation of these probes focused on maximizing contrast enhancement, a second generation of probes has been developed to improve the accumulation within specific tissues or pathologies, and the newest generation of agents is also designed to report on changes in physiological status and has been termed "smart" agents. This represents a paradigm switch from the previously commercialized gadolinium and iron oxide probes to probes with new capabilities, and leads to new challenges as scanner hardware needs to be adapted for detecting these probes. In this chapter, we highlight the unique features for all five different categories of MR probes, including the emerging chemical exchange saturation transfer, (19)F, and hyperpolarized probes, and describe the key physical properties and features motivating their design. As part of this comparison, the strengths and weaknesses of each category are discussed.
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Affiliation(s)
- Michael T McMahon
- F.M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Institute, Baltimore, Maryland, USA; The Russell H. Morgan Department of Radiology and Radiological Sciences, Division of MR Research, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
| | - Kannie W Y Chan
- F.M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Institute, Baltimore, Maryland, USA; The Russell H. Morgan Department of Radiology and Radiological Sciences, Division of MR Research, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA; Cellular Imaging Section and Vascular Biology Program, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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Nepomuceno GM, Chan KM, Huynh V, Martin KS, Moore JT, O’Brien TE, Pollo LAE, Sarabia FJ, Tadeus C, Yao Z, Anderson DE, Ames JB, Shaw JT. Synthesis and Evaluation of Quinazolines as Inhibitors of the Bacterial Cell Division Protein FtsZ. ACS Med Chem Lett 2015; 6:308-12. [PMID: 25815151 DOI: 10.1021/ml500497s] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 01/07/2015] [Indexed: 02/06/2023] Open
Abstract
The bacterial cell division protein FtsZ is one of many potential targets for the development of novel antibiotics. Recently, zantrin Z3 was shown to be a cross-species inhibitor of FtsZ; however, its specific interactions with the protein are still unknown. Herein we report the synthesis of analogues that contain a more tractable core structure and an analogue with single-digit micromolar inhibition of FtsZ's GTPase activity, which represents the most potent inhibitor of Escherichia coli FtsZ reported to date. In addition, the zantrin Z3 core has been converted to two potential photo-cross-linking reagents for proteomic studies that could shed light on the molecular interactions between FtsZ and molecules related to zantrin Z3.
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Affiliation(s)
| | - Katie M. Chan
- University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Valerie Huynh
- University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Kevin S. Martin
- University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Jared T. Moore
- University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Terrence E. O’Brien
- University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Luiz A. E. Pollo
- University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Francisco J. Sarabia
- University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Clarissa Tadeus
- University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Zi Yao
- University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - David E. Anderson
- University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - James B. Ames
- University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Jared T. Shaw
- University of California, Davis, One Shields Avenue, Davis, California 95616, United States
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66
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Funk AM, Harvey P, Finney KLNA, Fox MA, Kenwright AM, Rogers NJ, Senanayake PK, Parker D. Challenging lanthanide relaxation theory: erbium and thulium complexes that show NMR relaxation rates faster than dysprosium and terbium analogues. Phys Chem Chem Phys 2015; 17:16507-11. [DOI: 10.1039/c5cp02210j] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The unususal relaxation behaviour of lanthanide complexes in solution exposes the limitations of paramagnetic relaxation theory.
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Affiliation(s)
| | - Peter Harvey
- Department of Chemistry
- Durham University
- Durham DH1 3LE
- UK
| | | | - Mark A. Fox
- Department of Chemistry
- Durham University
- Durham DH1 3LE
- UK
| | | | | | | | - David Parker
- Department of Chemistry
- Durham University
- Durham DH1 3LE
- UK
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67
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Funk AM, Finney KLNA, Harvey P, Kenwright AM, Neil ER, Rogers NJ, Kanthi Senanayake P, Parker D. Critical analysis of the limitations of Bleaney's theory of magnetic anisotropy in paramagnetic lanthanide coordination complexes. Chem Sci 2014; 6:1655-1662. [PMID: 29449916 PMCID: PMC5812375 DOI: 10.1039/c4sc03429e] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Accepted: 12/17/2014] [Indexed: 11/30/2022] Open
Abstract
The origins of the breakdown of Bleaney's theory of magnetic anisotropy are described, based on an analysis of eleven different complexes of the second half of the 4f elements that form isostructural series.
The origins of the breakdown of Bleaney's theory of magnetic anisotropy are described, based on an analysis of eleven different complexes of the second half of the 4f elements that form isostructural series. An examination of the chemical shift and relaxation rate behaviour of resonances located at least four bonds away from the paramagnetic centre was undertaken, and correlated to theoretical predictions. The key limitations relate to comparability of ligand field splitting with spin–orbit coupling, variation in the position of the principal magnetic axis between Ln complexes and the importance of multipolar terms in describing lanthanide ligand field interactions.
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Affiliation(s)
- Alexander M Funk
- Department of Chemistry , Durham University , South Road , Durham , DH1 3LE , UK .
| | | | - Peter Harvey
- Department of Chemistry , Durham University , South Road , Durham , DH1 3LE , UK .
| | - Alan M Kenwright
- Department of Chemistry , Durham University , South Road , Durham , DH1 3LE , UK .
| | - Emily R Neil
- Department of Chemistry , Durham University , South Road , Durham , DH1 3LE , UK .
| | - Nicola J Rogers
- Department of Chemistry , Durham University , South Road , Durham , DH1 3LE , UK .
| | - P Kanthi Senanayake
- Department of Chemistry , Durham University , South Road , Durham , DH1 3LE , UK .
| | - David Parker
- Department of Chemistry , Durham University , South Road , Durham , DH1 3LE , UK .
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68
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Tirotta I, Dichiarante V, Pigliacelli C, Cavallo G, Terraneo G, Bombelli FB, Metrangolo P, Resnati G. (19)F magnetic resonance imaging (MRI): from design of materials to clinical applications. Chem Rev 2014; 115:1106-29. [PMID: 25329814 DOI: 10.1021/cr500286d] [Citation(s) in RCA: 340] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Ilaria Tirotta
- Laboratory of Nanostructured Fluorinated Materials (NFMLab), Department of Chemistry, Materials, and Chemical Engineering "Giulio Natta" and ‡Fondazione Centro Europeo Nanomedicina, Politecnico di Milano , Milan 20131, Italy
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69
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de Vries A, Moonen R, Yildirim M, Langereis S, Lamerichs R, Pikkemaat JA, Baroni S, Terreno E, Nicolay K, Strijkers GJ, Grüll H. Relaxometric studies of gadolinium-functionalized perfluorocarbon nanoparticles for MR imaging. CONTRAST MEDIA & MOLECULAR IMAGING 2014; 9:83-91. [PMID: 24470297 DOI: 10.1002/cmmi.1541] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Revised: 02/23/2013] [Accepted: 03/10/2013] [Indexed: 01/17/2023]
Abstract
Fluorine MRI ((19) F MRI) is receiving an increasing attention as a viable alternative to proton-based MRI ((1) H MRI) for dedicated application in molecular imaging. The (19) F nucleus has a high gyromagnetic ratio, a 100% natural abundance and is furthermore hardly present in human tissues allowing for hot spot MR imaging. The applicability of (19) F MRI as a molecular and cellular imaging technique has been exploited, ranging from cell tracking to detection and imaging of tumors in preclinical studies. In addition to applications, developing new contrast materials with improved relaxation properties has also been a core research topic in the field, since the inherently low longitudinal relaxation rates of perfluorocarbon compounds result in relatively low imaging efficiency. Borrowed from (1) H MRI, the incorporation of lanthanides, specifically Gd(III) complexes, as signal modulating ingredients in the nanoparticle formulation has emerged as a promising approach to improvement of the fluorine signal. Three different perfluorocarbon emulsions were investigated at five different magnetic field strengths. Perfluoro-15-crown-5-ether was used as the core material and Gd(III)DOTA-DSPE, Gd(III)DOTA-C6-DSPE and Gd(III)DTPA-BSA as the relaxation altering components. While Gd(III)DOTA-DSPE and Gd(III)DOTA-C6-DSPE were favorable constructs for (1) H NMR, Gd(III)DTPA-BSA showed the strongest increase in (19F) R(1). These results show the potential of the use of paramagnetic lipids to increase (19F) R(1) at clinical field strengths (1.5-3 T). At higher field strengths (6.3-14 T), gadolinium does not lead to an increase in (19F) R(1) compared with emulsions without gadolinium, but leads to an significant increase in (19F) R(2). Our data therefore suggest that the most favorable situation for fluorine measurements is at high magnetic fields without the inclusion of gadolinium constructs.
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Affiliation(s)
- Anke de Vries
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
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70
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Wu M, Ji X, Dai W, Cao S. Copper-free direct C-H trifluoromethylation of acetanilides with sodium trifluoromethanesulfinate. J Org Chem 2014; 79:8984-9. [PMID: 25188710 DOI: 10.1021/jo501221h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A copper-free direct C-H ortho trifluoromethylation of electron-deficient 4-substituted acetanilides using Langlois reagent (NaSO2CF3) as the CF3 source in the presence of tert-butyl hydroperoxide (tBuOOH, TBHP) was developed.
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Affiliation(s)
- Mingxi Wu
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology (ECUST) , Shanghai 200237, China
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71
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Neil ER, Funk AM, Yufit DS, Parker D. Synthesis, stereocontrol and structural studies of highly luminescent chiral tris-amidepyridyl-triazacyclononane lanthanide complexes. Dalton Trans 2014; 43:5490-504. [DOI: 10.1039/c3dt53000k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
S at C gives the Δ complex; extending the chromophore gives an emission brightness of 20 mM−1 cm−1.
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Affiliation(s)
| | | | | | - David Parker
- Department of Chemistry
- Durham University
- Durham, UK
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72
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Characterisation and evaluation of paramagnetic fluorine labelled glycol chitosan conjugates for 19F and 1H magnetic resonance imaging. J Biol Inorg Chem 2013; 19:215-27. [DOI: 10.1007/s00775-013-1028-y] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Accepted: 07/22/2013] [Indexed: 12/29/2022]
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73
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Funk AM, Fries PH, Harvey P, Kenwright AM, Parker D. Experimental Measurement and Theoretical Assessment of Fast Lanthanide Electronic Relaxation in Solution with Four Series of Isostructural Complexes. J Phys Chem A 2013; 117:905-17. [DOI: 10.1021/jp311273x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Alexander M. Funk
- Department of Chemistry, Durham University, South Road, Durham
DH1 3LE, U.K
| | - Pascal H. Fries
- CEA, INAC, Service de Chimie Inorganique et Biologique (UMR_E3 CEA UJF), 38054 Grenoble, France
| | - Peter Harvey
- Department of Chemistry, Durham University, South Road, Durham
DH1 3LE, U.K
| | - Alan M. Kenwright
- Department of Chemistry, Durham University, South Road, Durham
DH1 3LE, U.K
| | - David Parker
- Department of Chemistry, Durham University, South Road, Durham
DH1 3LE, U.K
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74
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Harvey P, Blamire AM, Wilson JI, Finney KLNA, Funk AM, Senanayake PK, Parker D. Moving the goal posts: enhancing the sensitivity of PARASHIFT proton magnetic resonance imaging and spectroscopy. Chem Sci 2013. [DOI: 10.1039/c3sc51526e] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
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75
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Güden-Silber T, Klein K, Seitz M. 4,4′-Bis(trifluoromethyl)-2,2′-bipyridine – a multipurpose ligand scaffold for lanthanoid-based luminescence/19F NMR probes. Dalton Trans 2013; 42:13882-8. [PMID: 23922033 DOI: 10.1039/c3dt50842k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Tuba Güden-Silber
- Inorganic Chemistry I, Department of Chemistry and Biochemistry, Ruhr-University Bochum, 44780 Bochum, Germany.
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76
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Yu JX, Kodibagkar VD, Liu L, Zhang Z, Liu L, Magnusson J, Liu Y. 19F-MRS/1H-MRI dual-function probe for detection of β-galactosidase activity. Chem Sci 2013. [DOI: 10.1039/c3sc21099e] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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77
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Walton JW, Carr R, Evans NH, Funk AM, Kenwright AM, Parker D, Yufit DS, Botta M, De Pinto S, Wong KL. Isostructural Series of Nine-Coordinate Chiral Lanthanide Complexes Based on Triazacyclononane. Inorg Chem 2012; 51:8042-56. [DOI: 10.1021/ic300147p] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- James W. Walton
- Department of Chemistry, Durham University, South Road, Durham
DH1 3LE, U.K
| | - Rachel Carr
- Department of Chemistry, Durham University, South Road, Durham
DH1 3LE, U.K
| | - Nicholas H. Evans
- Department of Chemistry, Durham University, South Road, Durham
DH1 3LE, U.K
| | - Alexander M. Funk
- Department of Chemistry, Durham University, South Road, Durham
DH1 3LE, U.K
| | - Alan M. Kenwright
- Department of Chemistry, Durham University, South Road, Durham
DH1 3LE, U.K
| | - David Parker
- Department of Chemistry, Durham University, South Road, Durham
DH1 3LE, U.K
| | - Dmitry S. Yufit
- Department of Chemistry, Durham University, South Road, Durham
DH1 3LE, U.K
| | - Mauro Botta
- Dipartimento di
Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, “Amedeo Avogadro”
Viale Teresa Michel 11, 15121 Alessandria, Italy
| | - Sara De Pinto
- Dipartimento di
Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, “Amedeo Avogadro”
Viale Teresa Michel 11, 15121 Alessandria, Italy
| | - Ka-Leung Wong
- Department of Chemistry, Hong Kong Baptist University, Kowloon
Tong, Hong Kong
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78
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Harvey P, Chalmers KH, De Luca E, Mishra A, Parker D. Paramagnetic 19F chemical shift probes that respond selectively to calcium or citrate levels and signal ester hydrolysis. Chemistry 2012; 18:8748-57. [PMID: 22689478 DOI: 10.1002/chem.201200737] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2012] [Indexed: 11/11/2022]
Abstract
Paramagnetic magnetic resonance chemical shift probes containing a proximal CF(3) group have been characterised. Different systems have been created that report reversible changes in calcium ion concentrations in the millimolar regime, signal the presence of citrate selectively in competitive aqueous media and allow the monitoring of remote ester/amide hydrolysis in relayed, irreversible transformations. Chemical shift non-equivalence is amplified by the presence of the proximate lanthanide ion, with a mean separation between the CF(3) group and the metal ion of 6.4 Å found for a thulium complex, in an X-ray structure of the metal complex aqua adduct. The enhanced rate of longitudinal relaxation of the (19)F nucleus allows faster data acquisition.
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Affiliation(s)
- Peter Harvey
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK
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79
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Schmid F, Höltke C, Parker D, Faber C. Boosting19F MRI-SNR efficient detection of paramagnetic contrast agents using ultrafast sequences. Magn Reson Med 2012; 69:1056-62. [DOI: 10.1002/mrm.24341] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Revised: 04/24/2012] [Accepted: 04/26/2012] [Indexed: 01/26/2023]
Affiliation(s)
- Florian Schmid
- Department of Clinical Radiology; University Hospital Münster; Münster; Germany
| | - Carsten Höltke
- Department of Clinical Radiology; University Hospital Münster; Münster; Germany
| | - David Parker
- Department of Chemistry; Durham University; Durham; United Kingdom
| | - Cornelius Faber
- Department of Clinical Radiology; University Hospital Münster; Münster; Germany
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80
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Yang Y, Schühle DT, Dai G, Alford J, Caravan P. 1H chemical shift magnetic resonance imaging probes with high sensitivity for multiplex imaging. CONTRAST MEDIA & MOLECULAR IMAGING 2012; 7:276-9. [PMID: 22434641 PMCID: PMC3321363 DOI: 10.1002/cmmi.490] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Proton-based chemical shift imaging probes were encapsulated inside nano-carriers to increase the sensivitity of the reporters. Co-encapsulation with a relaxation agent results in improved sensitivity and suppresses background signals. Simultaneous imaging of different chemical shift reporters allows multiplexed detection.
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Affiliation(s)
- Yan Yang
- A.A. Martinos Center for Biomedical Imaging Massachusetts General Hospital, Harvard Medical School 149, 13th Street, Suite 2301, Charlestown, MA 02129, USA. Fax: (+1) 617-726-7422
- Zhongnan Hospital of Wuhan University, Donghu Road 169, Wuhan, Hubei Province, China
| | - Daniel T. Schühle
- A.A. Martinos Center for Biomedical Imaging Massachusetts General Hospital, Harvard Medical School 149, 13th Street, Suite 2301, Charlestown, MA 02129, USA. Fax: (+1) 617-726-7422
| | - Guangping Dai
- A.A. Martinos Center for Biomedical Imaging Massachusetts General Hospital, Harvard Medical School 149, 13th Street, Suite 2301, Charlestown, MA 02129, USA. Fax: (+1) 617-726-7422
| | - Jamu Alford
- A.A. Martinos Center for Biomedical Imaging Massachusetts General Hospital, Harvard Medical School 149, 13th Street, Suite 2301, Charlestown, MA 02129, USA. Fax: (+1) 617-726-7422
| | - Peter Caravan
- A.A. Martinos Center for Biomedical Imaging Massachusetts General Hospital, Harvard Medical School 149, 13th Street, Suite 2301, Charlestown, MA 02129, USA. Fax: (+1) 617-726-7422
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81
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Blackburn OA, Tropiano M, Sørensen TJ, Thom J, Beeby A, Bushby LM, Parker D, Natrajan LS, Faulkner S. Luminescence and upconversion from thulium(iii) species in solution. Phys Chem Chem Phys 2012; 14:13378-84. [DOI: 10.1039/c2cp42228j] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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82
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Harvey P, Kuprov I, Parker D. Lanthanide Complexes as Paramagnetic Probes for 19F Magnetic Resonance. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100894] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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83
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Jiang ZX, Feng Y, Yu YB. Fluorinated paramagnetic chelates as potential multi-chromic 19F tracer agents. Chem Commun (Camb) 2011; 47:7233-5. [PMID: 21617807 DOI: 10.1039/c1cc11150g] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A class of potential multi-chromic (19)F imaging tracers is made by pairing metal ions with a fluorinated chelator. All fluorinated metal chelates emit a single (19)F signal. Paramagnetic metal ions shifted the (19)F signal frequency and made the (19)F relaxation rates insensitive toward local chemical environment.
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Affiliation(s)
- Zhong-Xing Jiang
- Department of Pharmaceutical Sciences, University of Maryland, Baltimore, MD 21201, USA
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84
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Terreno E, Boffa C, Menchise V, Fedeli F, Carrera C, Castelli DD, Digilio G, Aime S. Gadolinium-doped LipoCEST agents: a potential novel class of dual 1H-MRI probes. Chem Commun (Camb) 2011; 47:4667-9. [PMID: 21409237 DOI: 10.1039/c1cc10172b] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel class of paramagnetic liposome-based systems acting as dual T(1) and CEST (1)H-MRI contrast agents is described. The vesicles contain a shift reagent in the aqueous core and a Gd-complex on the external surface conjugated through a biodegradable linker. As such, the probe can generate T(1) contrast only, but after the cleavage and removal of the Gd-coating, the CEST contrast is switched on.
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Affiliation(s)
- Enzo Terreno
- Department of Chemistry IFM and Molecular & Preclinical Imaging Centres, University of Torino, via Nizza 52, 10126, Torino, Italy.
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85
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Chalmers KH, Kenwright AM, Parker D, Blamire AM. 19F-lanthanide complexes with increased sensitivity for 19F-MRI: optimization of the MR acquisition. Magn Reson Med 2011; 66:931-6. [PMID: 21381109 DOI: 10.1002/mrm.22881] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2010] [Revised: 01/26/2011] [Accepted: 01/28/2011] [Indexed: 01/17/2023]
Abstract
Fluorine-19 magnetic resonance methods offer advantages for molecular or cellular imaging in vivo due to the absence of radioactivity, lack of naturally occurring background signal, and the ability to easily combine measurements with anatomical MRI. Previous studies have shown that (19) F-MRI sensitivity is limited to millimolar concentrations by slow longitudinal relaxation. In this study, a new class of macrocyclic fluorinated lanthanide complexes is investigated where relaxation rates are significantly shortened by proximity of the fluorine group to a paramagnetic lanthanide ion located within the same molecule. Longitudinal and transverse relaxation rates are field dependent and in the range 50-150 s(-1) and 70-200 s(-1), respectively, at 7 T. Relaxation rates in these complexes are a function of the molecular structure and are independent of concentration at biologically relevant levels, so can be used as criteria to optimize imaging acquisition. Phantom experiments at 7 T indicate a lower limit for detection by imaging of 20 μM.
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86
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87
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Knight JC, Edwards PG, Paisey SJ. Fluorinated contrast agents for magnetic resonance imaging; a review of recent developments. RSC Adv 2011. [DOI: 10.1039/c1ra00627d] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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88
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Chalmers KH, Botta M, Parker D. Strategies to enhance signal intensity with paramagnetic fluorine-labelled lanthanide complexes as probes for19F magnetic resonance. Dalton Trans 2011; 40:904-13. [DOI: 10.1039/c0dt01232g] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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89
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Bonnet CS, Fries PH. Paramagnetic Relaxation Enhancements in Acetate and Its Fluorine Derivatives Interacting with Gd3+: Complex Formation, Structure, and Transmetallation. Chemphyschem 2010; 11:3474-84. [DOI: 10.1002/cphc.201000448] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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90
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Regueiro-Figueroa M, Esteban-Gómez D, de Blas A, Rodríguez-Blas T, Platas-Iglesias C. Structure and Dynamics of Lanthanide(III) Complexes with an N-Alkylated do3a Ligand (H3do3a = 1,4,7,10-Tetraazacyclododecane-1,4,7-triacetic Acid): A Combined Experimental and DFT Study. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201000334] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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91
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Cho JG, Cho JH, Lee CH, Ahn SD. A Systematic Study on MR Contrast Agents for Constructing Specific Relaxation Times. JOURNAL OF THE KOREAN MAGNETIC RESONANCE SOCIETY 2010. [DOI: 10.6564/jkmrs.2010.14.1.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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