1
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Kaster MA, Caldwell MA, Meade TJ. Development of Ln(III) Derivatives as 19F Parashift Probes. Inorg Chem 2024; 63:9877-9887. [PMID: 38748735 DOI: 10.1021/acs.inorgchem.4c00652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2024]
Abstract
19F parashift probes with paramagnetically shifted reporter nuclei provide attractive platforms to develop molecular imaging probes. These probes enable ratiometric detection of molecular disease markers using a direct detection technique. Here, we describe a series of trivalent lanthanide (Ln(III)) complexes that are structural analogues of the clinically approved MR contrast agent (CA) ProHance to obtain LnL 19F parashift probes. We evaluated trans-gadolinium paramagnetic lanthanides compared to diamagnetic YL for 19F chemical shift and relaxation rate enhancement. The paramagnetic contribution to chemical shift (δPCS) for paramagnetic LnL exhibited either shifts to lower frequency (δPCS < 0 for TbL, DyL, and HoL) or shifts to higher frequency (δPCS > 0 for ErL, TmL, and YbL) compared to YL 19F spectroscopic signal. Zero-echo time pulse sequences achieved 56-fold sensitivity enhancement for DyL over YL, while developing probe-specific pulse sequences with fast delay times and acquisition times achieved 0.6-fold enhancement in limit of detection for DyL. DyL provides an attractive platform to develop 19F parashift probes for ratiometric detection of enzymatic activity.
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Affiliation(s)
- Megan A Kaster
- Departments of Chemistry, Molecular Biosciences, Neurobiology and Radiology, Northwestern University, 2145 N. Sheridan Road, Evanston, Illinois 60208, United States
| | - Michael A Caldwell
- Departments of Chemistry, Molecular Biosciences, Neurobiology and Radiology, Northwestern University, 2145 N. Sheridan Road, Evanston, Illinois 60208, United States
| | - Thomas J Meade
- Departments of Chemistry, Molecular Biosciences, Neurobiology and Radiology, Northwestern University, 2145 N. Sheridan Road, Evanston, Illinois 60208, United States
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2
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Kadakia RT, Ryan RT, Cooke DJ, Que EL. An Fe complex for 19F magnetic resonance-based reversible redox sensing and multicolor imaging. Chem Sci 2023; 14:5099-5105. [PMID: 37206407 PMCID: PMC10189869 DOI: 10.1039/d2sc05222a] [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: 09/19/2022] [Accepted: 04/14/2023] [Indexed: 05/21/2023] Open
Abstract
We report a first-in-class responsive, pentafluorosulfanyl (-SF5)-tagged 19F MRI agent capable of reversibly detecting reducing environments via an FeII/III redox couple. In the FeIII form, the agent displays no 19F MR signal due to paramagnetic relaxation enhancement-induced signal broadening; however, upon rapid reduction to FeII with one equivalent of cysteine, the agent displays a robust 19F signal. Successive oxidation and reduction studies validate the reversibility of the agent. The -SF5 tag in this agent enables 'multicolor imaging' in conjunction with sensors containing alternative fluorinated tags and this was demonstrated via simultaneous monitoring of the 19F MR signal of this -SF5 agent and a hypoxia-responsive agent containing a -CF3 group.
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Affiliation(s)
- Rahul T Kadakia
- Department of Chemistry, University of Texas at Austin 105 E 24th St. Stop A5300 Austin TX 78712 USA
| | - Raphael T Ryan
- Department of Chemistry, University of Texas at Austin 105 E 24th St. Stop A5300 Austin TX 78712 USA
| | - Daniel J Cooke
- Department of Chemistry, University of Texas at Austin 105 E 24th St. Stop A5300 Austin TX 78712 USA
| | - Emily L Que
- Department of Chemistry, University of Texas at Austin 105 E 24th St. Stop A5300 Austin TX 78712 USA
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3
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Tirukoti ND, Avram L, Haris T, Lerner B, Diskin-Posner Y, Allouche-Arnon H, Bar-Shir A. Fast Ion-Chelate Dissociation Rate for In Vivo MRI of Labile Zinc with Frequency-Specific Encodability. J Am Chem Soc 2021; 143:11751-11758. [PMID: 34297566 PMCID: PMC8397314 DOI: 10.1021/jacs.1c05376] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
![]()
Fast ion-chelate
dissociation rates and weak ion-chelate affinities
are desired kinetic and thermodynamic features for imaging probes
to allow reversible binding and to prevent deviation from basal ionic
levels. Nevertheless, such properties often result in poor readouts
upon ion binding, frequently result in low ion specificity, and do
not allow the detection of a wide range of concentrations. Herein,
we show the design, synthesis, characterization, and implementation
of a Zn2+-probe developed for MRI that possesses reversible
Zn2+-binding properties with a rapid dissociation rate
(koff = 845 ± 35 s–1) for the detection of a wide range of biologically relevant concentrations.
Benefiting from the implementation of chemical exchange saturation
transfer (CEST), which is here applied in the 19F-MRI framework
in an approach termed ion CEST (iCEST), we demonstrate the ability
to map labile Zn2+ with spectrally resolved specificity
and with no interference from competitive cations. Relying on fast koff rates for enhanced signal amplification,
the use of iCEST allowed the designed fluorinated chelate to experience
weak Zn2+-binding affinity (Kd at the mM range), but without compromising high cationic specificity,
which is demonstrated here for mapping the distribution of labile
Zn2+ in the hippocampal tissue of a live mouse. This strategy
for accelerating ion-chelate koff rates
for the enhancement of MRI signal amplifications without affecting
ion specificity could open new avenues for the design of additional
probes for other metal ions beyond zinc.
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Affiliation(s)
- Nishanth D Tirukoti
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Liat Avram
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Talia Haris
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Benjamin Lerner
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Yael Diskin-Posner
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Hyla Allouche-Arnon
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Amnon Bar-Shir
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 7610001, Israel
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4
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The Design of Abnormal Microenvironment Responsive MRI Nanoprobe and Its Application. Int J Mol Sci 2021; 22:ijms22105147. [PMID: 34067989 PMCID: PMC8152268 DOI: 10.3390/ijms22105147] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 05/06/2021] [Accepted: 05/11/2021] [Indexed: 02/07/2023] Open
Abstract
Magnetic resonance imaging (MRI) is often used to diagnose diseases due to its high spatial, temporal and soft tissue resolution. Frequently, probes or contrast agents are used to enhance the contrast in MRI to improve diagnostic accuracy. With the development of molecular imaging techniques, molecular MRI can be used to obtain 3D anatomical structure, physiology, pathology, and other relevant information regarding the lesion, which can provide an important reference for the accurate diagnosis and treatment of the disease in the early stages. Among existing contrast agents, smart or activatable nanoprobes can respond to selective stimuli, such as proving the presence of acidic pH, active enzymes, or reducing environments. The recently developed environment-responsive or smart MRI nanoprobes can specifically target cells based on differences in the cellular environment and improve the contrast between diseased tissues and normal tissues. Here, we review the design and application of these environment-responsive MRI nanoprobes.
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5
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Modo M. 19F Magnetic Resonance Imaging and Spectroscopy in Neuroscience. Neuroscience 2021; 474:37-50. [PMID: 33766776 DOI: 10.1016/j.neuroscience.2021.03.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 03/11/2021] [Accepted: 03/12/2021] [Indexed: 12/23/2022]
Abstract
1H magnetic resonance imaging (MRI) has established itself as a key diagnostic technique, affording the visualization of brain anatomy, blood flow, activity and connectivity. The detection of other atoms (e.g. 19F, 23Na, 31P), so called hetero-nuclear MRI and spectroscopy (MRS), provides investigative avenues that complement and extend the richness of information that can be gained from 1H MRI. Especially 19F MRI is increasingly emerging as a multi-nuclear (1H/19F) technique that can be exploited to visualize cell migration and trafficking. The lack of a 19F background signal in the brain affords an unequivocal detection suitable for quantification. Fluorine-based contrast material can be engineered as nanoemulsions, nanocapsules, or nanoparticles to label cells in vitro or in vivo. Fluorinated blood substitutes, typically nanoemulsions, can also carry oxygen and serve as a theranostic in poorly perfused brain regions. Brain tissue concentrations of fluorinated pharmaceuticals, including inhalation anesthetics (e.g. isoflurane) and anti-depressants (e.g. fluoxetine), can also be measured using MRS. However, the low signal from these compounds provides a challenge for imaging. Further methodological advances that accelerate signal acquisition (e.g. compressed sensing, cryogenic coils) are required to expand the applications of 19F MR imaging to, for instance, determine the regional pharmacokinetics of novel fluorine-based drugs. Improvements in 19F signal detection and localization, combined with the development of novel sensitive probes, will increase the utility of these multi-nuclear studies. These advances will provide new insights into cellular and molecular processes involved in neurodegenerative disease, as well as the mode of action of pharmaceutical compounds.
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Affiliation(s)
- Michel Modo
- Department of Radiology, University of Pittsburgh, Pittsburgh, PA, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA.
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6
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Bonnet CS, Tóth É. Metal-based environment-sensitive MRI contrast agents. Curr Opin Chem Biol 2021; 61:154-169. [PMID: 33706246 DOI: 10.1016/j.cbpa.2021.01.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 01/07/2021] [Accepted: 01/31/2021] [Indexed: 12/30/2022]
Abstract
Interactions of paramagnetic metal complexes with their biological environment can modulate their magnetic resonance imaging (MRI) contrast-enhancing properties in different ways, and this has been widely exploited to create responsive probes that can provide biochemical information. We survey progress in two rapidly growing areas: the MRI detection of biologically important metal ions, such as calcium, zinc, and copper, and the use of transition metal complexes as smart MRI agents. In both fields, new imaging technologies, which take advantage of other nuclei (19F) and/or paramagnetic contact shift effects, emerge beyond classical, relaxation-based applications. Most importantly, in vivo imaging is gaining ground, and the promise of molecular MRI is becoming reality, at least for preclinical research.
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Affiliation(s)
- Célia S Bonnet
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Rue Charles Sadron, Orléans, 45071, France
| | - Éva Tóth
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Rue Charles Sadron, Orléans, 45071, France.
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Wu T, Li A, Chen K, Peng X, Zhang J, Jiang M, Chen S, Zheng X, Zhou X, Jiang ZX. Perfluoro- tert-butanol: a cornerstone for high performance fluorine-19 magnetic resonance imaging. Chem Commun (Camb) 2021; 57:7743-7757. [PMID: 34286714 DOI: 10.1039/d1cc02133h] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
As a versatile quantification and tracking technology, 19F magnetic resonance imaging (19F MRI) provides quantitative "hot-spot" images without ionizing radiation, tissue depth limit, and background interference. However, the lack of suitable imaging agents severely hampers its clinical application. First, because the 19F signals are solely originated from imaging agents, the relatively low sensitivity of MRI technology requires high local 19F concentrations to generate images, which are often beyond the reach of many 19F MRI agents. Second, the peculiar physicochemical properties of many fluorinated compounds usually lead to low 19F signal intensity, tedious formulation, severe organ retention, etc. Therefore, the development of 19F MRI agents with high sensitivity and with suitable physicochemical and biological properties is of great importance. To this end, perfluoro-tert-butanol (PFTB), containing nine equivalent 19F and a modifiable hydroxyl group, has outperformed most perfluorocarbons as a valuable building block for high performance 19F MRI agents. Herein, we summarize the development and application of PFTB-based 19F MRI agents and analyze the strategies to improve their sensitivity and physicochemical and biological properties. In the context of PFC-based 19F MRI agents, we also discuss the challenges and prospects of PFTB-based 19F MRI agents.
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Affiliation(s)
- Tingjuan Wu
- Group of Lead Compound, Department of Pharmacy, Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China.
| | - Anfeng Li
- Group of Lead Compound, Department of Pharmacy, Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China.
| | - Kexin Chen
- Group of Lead Compound, Department of Pharmacy, Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China.
| | - Xingxing Peng
- Group of Lead Compound, Department of Pharmacy, Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China.
| | - Jing Zhang
- Hubei Province Engineering and Technology Research Center for Fluorinated Pharmaceuticals, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China.
| | - Mou Jiang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovative Academy of Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, Wuhan 430071, 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, Innovative Academy of Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, Wuhan 430071, China.
| | - Xing Zheng
- Group of Lead Compound, Department of Pharmacy, Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China.
| | - 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, Innovative Academy of Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, Wuhan 430071, China.
| | - Zhong-Xing Jiang
- Group of Lead Compound, Department of Pharmacy, Hunan Provincial Key Laboratory of Tumor Microenvironment Responsive Drug Research, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China. and Hubei Province Engineering and Technology Research Center for Fluorinated Pharmaceuticals, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China.
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8
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Malikidogo KP, Martin H, Bonnet CS. From Zn(II) to Cu(II) Detection by MRI Using Metal-Based Probes: Current Progress and Challenges. Pharmaceuticals (Basel) 2020; 13:E436. [PMID: 33266014 PMCID: PMC7760112 DOI: 10.3390/ph13120436] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 11/24/2020] [Accepted: 11/27/2020] [Indexed: 01/02/2023] Open
Abstract
Zinc and copper are essential cations involved in numerous biological processes, and variations in their concentrations can cause diseases such as neurodegenerative diseases, diabetes and cancers. Hence, detection and quantification of these cations are of utmost importance for the early diagnosis of disease. Magnetic resonance imaging (MRI) responsive contrast agents (mainly Lanthanide(+III) complexes), relying on a change in the state of the MRI active part upon interaction with the cation of interest, e.g., switch ON/OFF or vice versa, have been successfully utilized to detect Zn2+ and are now being developed to detect Cu2+. These paramagnetic probes mainly exploit the relaxation-based properties (T1-based contrast agents), but also the paramagnetic induced hyperfine shift properties (paraCEST and parashift probes) of the contrast agents. The challenges encountered going from Zn2+ to Cu2+ detection will be stressed and discussed herein, mainly involving the selectivity of the probes for the cation to detect and their responsivity at physiologically relevant concentrations. Depending on the response mechanism, the use of fast-field cycling MRI seems promising to increase the detection field while keeping a good response. In vivo applications of cation responsive MRI probes are only in their infancy and the recent developments will be described, along with the associated quantification problems. In the case of relaxation agents, the presence of another method of local quantification, e.g., synchrotron X-Ray fluorescence, single-photon emission computed tomography (SPECT) or positron emission tomography (PET) techniques, or 19F MRI is required, each of which has its own advantages and disadvantages.
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Affiliation(s)
| | | | - Célia S. Bonnet
- Centre de Biophysique Moléculaire, Université d’Orléans, Rue Charles Sadron, F-45071 Orléans 2, France; (K.P.M.); (H.M.)
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9
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Dal Poggetto G, Soares JV, Tormena CF. Selective Nuclear Magnetic Resonance Experiments for Sign-Sensitive Determination of Heteronuclear Couplings: Expanding the Analysis of Crude Reaction Mixtures. Anal Chem 2020; 92:14047-14053. [PMID: 32924438 PMCID: PMC7660590 DOI: 10.1021/acs.analchem.0c02976] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
State-of-the-art nuclear magnetic resonance (NMR) selective experiments are capable of directly analyzing crude reaction mixtures. A new experiment named HD-HAPPY-FESTA yields ultrahigh-resolution total correlation subspectra, which are suitable for sign-sensitive determination of heteronuclear couplings, as demonstrated here by measuring the sign and magnitude for proton-fluorine couplings (JHF) from major and minor isomer products of a two-step reaction without any purification. Proton-fluorine couplings ranging from 51.5 to -2.6 Hz could be measured using HD-HAPPY-FESTA, with the smallest measured magnitude of 0.8 Hz. Experimental JHF values were used to identify the two fluoroketone intermediates and the four fluoroalcohol products. Results were rationalized and compared with the density functional theory (DFT) calculations. Experimental data were further compared with the couplings reported in the literature, where pure samples were analyzed.
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Affiliation(s)
- Guilherme Dal Poggetto
- Institute of Chemistry, University of Campinas (UNICAMP), PO BOX 6154, Campinas, São Paulo CEP 13083-970, Brazil
| | - João Vitor Soares
- Institute of Chemistry, University of Campinas (UNICAMP), PO BOX 6154, Campinas, São Paulo CEP 13083-970, Brazil
| | - Cláudio F Tormena
- Institute of Chemistry, University of Campinas (UNICAMP), PO BOX 6154, Campinas, São Paulo CEP 13083-970, Brazil
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Khalighinejad P, Parrott D, Sherry AD. Imaging Tissue Physiology In Vivo by Use of Metal Ion-Responsive MRI Contrast Agents. Pharmaceuticals (Basel) 2020; 13:E268. [PMID: 32987721 PMCID: PMC7598704 DOI: 10.3390/ph13100268] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 09/21/2020] [Accepted: 09/22/2020] [Indexed: 12/18/2022] Open
Abstract
Paramagnetic metal ion complexes, mostly based on gadolinium (Gd3+), have been used for over 30 years as magnetic resonance imaging (MRI) contrast agents. Gd3+-based contrast agents have a strong influence on T1 relaxation times and are consequently the most commonly used agents in both the clinical and research environments. Zinc is an essential element involved with over 3000 different cellular proteins, and disturbances in tissue levels of zinc have been linked to a wide range of pathologies, including Alzheimer's disease, prostate cancer, and diabetes mellitus. MR contrast agents that respond to the presence of Zn2+ in vivo offer the possibility of imaging changes in Zn2+ levels in real-time with the superior spatial resolution offered by MRI. Such responsive agents, often referred to as smart agents, are typically composed of a paramagnetic metal ion with a ligand encapsulating it and one or more chelating units that selectively bind with the analyte of interest. Translation of these agents into clinical radiology is the next goal. In this review, we discuss Gd3+-based MR contrast agents that respond to a change in local Zn2+ concentration.
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Affiliation(s)
- Pooyan Khalighinejad
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA;
| | - Daniel Parrott
- Department of Radiology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA;
| | - A. Dean Sherry
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA;
- Department of Radiology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA;
- Department of Chemistry & Biochemistry, University of Texas at Dallas, Richardson, TX 75080, USA
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11
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Xie D, Yu M, Xie Z, Kadakia RT, Chung C, Ohman LE, Javanmardi K, Que EL. Versatile Nickel(II) Scaffolds as Coordination‐Induced Spin‐State Switches for
19
F Magnetic Resonance‐Based Detection. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202010587] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Da Xie
- Department of Chemistry The University of Texas at Austin 105 E. 24th St Stop A5300 Austin TX 78712 USA
| | - Meng Yu
- Department of Chemistry The University of Texas at Austin 105 E. 24th St Stop A5300 Austin TX 78712 USA
| | - Zhu‐Lin Xie
- Department of Chemistry The University of Texas at Austin 105 E. 24th St Stop A5300 Austin TX 78712 USA
| | - Rahul T. Kadakia
- Department of Chemistry The University of Texas at Austin 105 E. 24th St Stop A5300 Austin TX 78712 USA
| | - Chris Chung
- Department of Chemistry The University of Texas at Austin 105 E. 24th St Stop A5300 Austin TX 78712 USA
| | - Lauren E. Ohman
- Department of Chemistry The University of Texas at Austin 105 E. 24th St Stop A5300 Austin TX 78712 USA
| | - Kamyab Javanmardi
- Department of Molecular Biosciences The University of Texas at Austin 2500 Speedway Austin TX 78712 USA
| | - Emily L. Que
- Department of Chemistry The University of Texas at Austin 105 E. 24th St Stop A5300 Austin TX 78712 USA
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12
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Xie D, Yu M, Xie ZL, Kadakia RT, Chung C, Ohman LE, Javanmardi K, Que EL. Versatile Nickel(II) Scaffolds as Coordination-Induced Spin-State Switches for 19 F Magnetic Resonance-Based Detection. Angew Chem Int Ed Engl 2020; 59:22523-22530. [PMID: 32790890 DOI: 10.1002/anie.202010587] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Indexed: 12/15/2022]
Abstract
19 F magnetic resonance (MR) based detection coupled with well-designed inorganic systems shows promise in biological investigations. Two proof-of-concept inorganic probes that exploit a novel mechanism for 19 F MR sensing based on converting from low-spin (S=0) to high-spin (S=1) Ni2+ are reported. Activation of diamagnetic NiL1 and NiL2 by light or β-galactosidase, respectively, converts them into paramagnetic NiL0 , which displays a single 19 F NMR peak shifted by >35 ppm with accelerated relaxation rates. This spin-state switch is effective for sensing light or enzyme expression in live cells using 19 F MR spectroscopy and imaging that differentiate signals based on chemical shift and relaxation times. This general inorganic scaffold has potential for developing agents that can sense analytes ranging from ions to enzymes, opening up diverse possibilities for 19 F MR based biosensing.
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Affiliation(s)
- Da Xie
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th St Stop A5300, Austin, TX, 78712, USA
| | - Meng Yu
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th St Stop A5300, Austin, TX, 78712, USA
| | - Zhu-Lin Xie
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th St Stop A5300, Austin, TX, 78712, USA
| | - Rahul T Kadakia
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th St Stop A5300, Austin, TX, 78712, USA
| | - Chris Chung
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th St Stop A5300, Austin, TX, 78712, USA
| | - Lauren E Ohman
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th St Stop A5300, Austin, TX, 78712, USA
| | - Kamyab Javanmardi
- Department of Molecular Biosciences, The University of Texas at Austin, 2500 Speedway, Austin, TX, 78712, USA
| | - Emily L Que
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th St Stop A5300, Austin, TX, 78712, USA
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