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Meng Q, Wu M, Shang Z, Zhang Z, Zhang R. Responsive gadolinium(III) complex-based small molecule magnetic resonance imaging probes: Design, mechanism and application. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214398] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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2
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Amirav L, Berlin S, Olszakier S, Pahari SK, Kahn I. Multi-Modal Nano Particle Labeling of Neurons. Front Neurosci 2019; 13:12. [PMID: 30778281 PMCID: PMC6369355 DOI: 10.3389/fnins.2019.00012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Accepted: 01/08/2019] [Indexed: 01/06/2023] Open
Abstract
The development of imaging methodologies for single cell measurements over extended timescales of up to weeks, in the intact animal, will depend on signal strength, stability, validity and specificity of labeling. Whereas light-microscopy can achieve these with genetically-encoded probes or dyes, this modality does not allow mesoscale imaging of entire intact tissues. Non-invasive imaging techniques, such as magnetic resonance imaging (MRI), outperform light microscopy in field of view and depth of imaging, but do not offer cellular resolution and specificity, suffer from low signal-to-noise ratio and, in some instances, low temporal resolution. In addition, the origins of the signals measured by MRI are either indirect to the process of interest or hard to validate. It is therefore highly warranted to find means to enhance MRI signals to allow increases in resolution and cellular-specificity. To this end, cell-selective bi-functional magneto-fluorescent contrast agents can provide an elegant solution. Fluorescence provides means for identification of labeled cells and particles location after MRI acquisition, and it can be used to facilitate the design of cell-selective labeling of defined targets. Here we briefly review recent available designs of magneto-fluorescent markers and elaborate on key differences between them with respect to durability and relevant cellular highlighting approaches. We further focus on the potential of intracellular labeling and basic functional sensing MRI, with assays that enable imaging cells at microscopic and mesoscopic scales. Finally, we illustrate the qualities and limitations of the available imaging markers and discuss prospects for in vivo neural imaging and large-scale brain mapping.
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Affiliation(s)
- Lilac Amirav
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa, Israel
| | - Shai Berlin
- Department of Neuroscience, Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
| | - Shunit Olszakier
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa, Israel.,Department of Neuroscience, Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
| | - Sandip K Pahari
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa, Israel
| | - Itamar Kahn
- Department of Neuroscience, Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
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3
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Connah L, Truffault V, Platas-Iglesias C, Angelovski G. Investigations into the effects of linker length elongation on the behaviour of calcium-responsive MRI probes. Dalton Trans 2019; 48:13546-13554. [DOI: 10.1039/c9dt02672j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The effects of subtle structural changes on the coordination behaviour and subsequent relaxometric properties of two novel calcium-responsive magnetic resonance imaging probes have been assessed via a range of physicochemical techniques.
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Affiliation(s)
- Liam Connah
- MR Neuroimaging Agents
- Max Planck Institute for Biological Cybernetics
- 72076 Tuebingen
- Germany
| | - Vincent Truffault
- Max Planck Institute for Developmental Biology
- 72076 Tuebingen
- Germany
| | - Carlos Platas-Iglesias
- Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química
- Facultade de Ciencias
- Universidade da Coruña
- 15071 A Coruña
- Spain
| | - Goran Angelovski
- MR Neuroimaging Agents
- Max Planck Institute for Biological Cybernetics
- 72076 Tuebingen
- Germany
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4
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Gündüz S, Savić T, Pohmann R, Logothetis NK, Scheffler K, Angelovski G. Ratiometric Method for Rapid Monitoring of Biological Processes Using Bioresponsive MRI Contrast Agents. ACS Sens 2016; 1:483-487. [PMID: 29261290 DOI: 10.1021/acssensors.6b00011] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Bioresponsive magnetic resonance imaging (MRI) contrast agents hold great potential for noninvasive tracking of essential biological processes. Consequently, a number of MR sensors for several imaging protocols have been developed, attempting to produce the maximal signal difference for a given event. Here we introduce an approach which could substantially improve the detection of physiological events with fast kinetics. We developed a nanosized, calcium-sensitive dendrimeric probe that changes longitudinal and transverse relaxation times with different magnitudes. The change in their ratio is rapidly recorded by means of a balanced steady-state free precession (bSSFP) imaging protocol. The employed methodology results in an almost four times greater signal gain per unit of time as compared to conventional T1-weighted imaging with small sized contrast agents. Furthermore, it is suitable for high resolution functional MRI at high magnetic fields. This methodology could evolve into a valuable tool for rapid monitoring of various biological events.
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Affiliation(s)
| | | | | | - Nikos K. Logothetis
- Department
of Imaging Science and Biomedical Engineering, University of Manchester, Manchester M13 9PT, United Kingdom
| | - Klaus Scheffler
- Department
for Biomedical Magnetic Resonance, University of Tübingen, 72076 Tübingen, Germany
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5
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Moussaron A, Vibhute S, Bianchi A, Gündüz S, Kotb S, Sancey L, Motto-Ros V, Rizzitelli S, Crémillieux Y, Lux F, Logothetis NK, Tillement O, Angelovski G. Ultrasmall Nanoplatforms as Calcium-Responsive Contrast Agents for Magnetic Resonance Imaging. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:4900-4909. [PMID: 26179212 DOI: 10.1002/smll.201500312] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2015] [Revised: 06/17/2015] [Indexed: 06/04/2023]
Abstract
The preparation of ultrasmall and rigid platforms (USRPs) that are covalently coupled to macrocycle-based, calcium-responsive/smart contrast agents (SCAs), and the initial in vitro and in vivo validation of the resulting nanosized probes (SCA-USRPs) by means of magnetic resonance imaging (MRI) is reported. The synthetic procedure is robust, allowing preparation of the SCA-USRPs on a multigram scale. The resulting platforms display the desired MRI activity—i.e., longitudinal relaxivity increases almost twice at 7 T magnetic field strength upon saturation with Ca(2+). Cell viability is probed with the MTT assay using HEK-293 cells, which show good tolerance for lower contrast agent concentrations over longer periods of time. On intravenous administration of SCA-USRPs in living mice, MRI studies indicate their rapid accumulation in the renal pelvis and parenchyma. Importantly, the MRI signal increases in both kidney compartments when CaCl2 is also administrated. Laser-induced breakdown spectroscopy experiments confirm accumulation of SCA-USRPs in the renal cortex. To the best of our knowledge, these are the first studies which demonstrate calcium-sensitive MRI signal changes in vivo. Continuing contrast agent and MRI protocol optimizations should lead to wider application of these responsive probes and development of superior functional methods for monitoring calcium-dependent physiological and pathological processes in a dynamic manner.
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Affiliation(s)
- Albert Moussaron
- Laboratoire MATEIS, INSA de Lyon, 69621, Villeurbanne Cedex, France
| | - Sandip Vibhute
- Department for Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, 72076, Tübingen, Germany
| | - Andrea Bianchi
- CRMSB, UMR 5536, Université Bordeaux, 33076, Bordeaux, France
| | - Serhat Gündüz
- MR Neuroimaging Agents Group, Max Planck Institute for Biological Cybernetics, Spemannstr. 41, 72076, Tübingen, Germany
| | - Shady Kotb
- Institut Lumière Matière, UMR CNRS 5306 - Université Lyon 1, 69622, Villeurbanne Cedex, France
| | - Lucie Sancey
- Institut Lumière Matière, UMR CNRS 5306 - Université Lyon 1, 69622, Villeurbanne Cedex, France
| | - Vincent Motto-Ros
- Institut Lumière Matière, UMR CNRS 5306 - Université Lyon 1, 69622, Villeurbanne Cedex, France
| | | | | | - Francois Lux
- Institut Lumière Matière, UMR CNRS 5306 - Université Lyon 1, 69622, Villeurbanne Cedex, France
| | - Nikos K Logothetis
- Department for Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, 72076, Tübingen, Germany
- Department of Imaging Science and Biomedical Engineering, University of Manchester, Manchester, M13 9PT, UK
| | - Olivier Tillement
- Institut Lumière Matière, UMR CNRS 5306 - Université Lyon 1, 69622, Villeurbanne Cedex, France
| | - Goran Angelovski
- MR Neuroimaging Agents Group, Max Planck Institute for Biological Cybernetics, Spemannstr. 41, 72076, Tübingen, Germany
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Gündüz S, Nitta N, Vibhute S, Shibata S, Mayer ME, Logothetis NK, Aoki I, Angelovski G. Dendrimeric calcium-responsive MRI contrast agents with slow in vivo diffusion. Chem Commun (Camb) 2015; 51:2782-5. [PMID: 25383973 DOI: 10.1039/c4cc07540d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
We report a methodology which enables the preparation of dendrimeric contrast agents sensitive to Ca(2+) when starting from the monomeric analogue. The Ca-triggered longitudinal relaxivity response of these agents is not compromised by undertaking synthetic transformations, despite structural changes. The in vivo MRI studies in the rat cerebral cortex indicate that diffusion properties of dendrimeric contrast agents have great advantages as compared to their monomeric equivalents.
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Affiliation(s)
- Serhat Gündüz
- MR Neuroimaging Agents Group, Max Planck Institute for Biological Cybernetics, 72076 Tübingen, Germany.
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7
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Hagberg GE, Mamedov I, Power A, Beyerlein M, Merkle H, Kiselev VG, Dhingra K, Kubìček V, Angelovski G, Logothetis NK. Diffusion properties of conventional and calcium-sensitive MRI contrast agents in the rat cerebral cortex. CONTRAST MEDIA & MOLECULAR IMAGING 2014; 9:71-82. [PMID: 24470296 DOI: 10.1002/cmmi.1535] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Revised: 11/22/2012] [Accepted: 01/15/2013] [Indexed: 01/01/2023]
Abstract
Calcium-sensitive MRI contrast agents can only yield quantitative results if the agent concentration in the tissue is known. The agent concentration could be determined by diffusion modeling, if relevant parameters were available. We have established an MRI-based method capable of determining diffusion properties of conventional and calcium-sensitive agents. Simulations and experiments demonstrate that the method is applicable both for conventional contrast agents with a fixed relaxivity value and for calcium-sensitive contrast agents. The full pharmacokinetic time-course of gadolinium concentration estimates was observed by MRI before, during and after intracerebral administration of the agent, and the effective diffusion coefficient D* was determined by voxel-wise fitting of the solution to the diffusion equation. The method yielded whole brain coverage with a high spatial and temporal sampling. The use of two types of MRI sequences for sampling of the diffusion time courses was investigated: Look-Locker-based quantitative T(1) mapping, and T(1) -weighted MRI. The observation times of the proposed MRI method is long (up to 20 h) and consequently the diffusion distances covered are also long (2-4 mm). Despite this difference, the D* values in vivo were in agreement with previous findings using optical measurement techniques, based on observation times of a few minutes. The effective diffusion coefficient determined for the calcium-sensitive contrast agents may be used to determine local tissue concentrations and to design infusion protocols that maintain the agent concentration at a steady state, thereby enabling quantitative sensing of the local calcium concentration.
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Affiliation(s)
- Gisela E Hagberg
- Department for Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Tübingen, Germany
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8
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Tanwar J, Datta A, Chauhan K, Kumaran SS, Tiwari AK, Kadiyala KG, Pal S, Thirumal M, Mishra AK. Design and synthesis of calcium responsive magnetic resonance imaging agent: Its relaxation and luminescence studies. Eur J Med Chem 2014; 82:225-32. [PMID: 24904969 DOI: 10.1016/j.ejmech.2014.05.046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2013] [Revised: 05/15/2014] [Accepted: 05/20/2014] [Indexed: 10/25/2022]
Abstract
Calcium concentration modulation both inside and outside cell is of considerable interest for nervous system function in normal and pathological conditions. MRI has potential for very high spatial resolution at molecular/cellular level. Design, synthesis and evaluation of Gd-DO3A-AME-NPHE, a calcium responsive MRI contrast agent is presented. The probe is comprised of a Gd(3+)-DO3A core coupled to iminoacetate coordinating groups for calcium induced relaxivity switching. In the absence of Ca(2+) ions, inner sphere water binding to the Gd-DO3A-AME-NPHE is restricted with longitudinal relaxivity, r1 = 4.37 mM(-1) s(-1) at 4.7 T. However, addition of Ca(2+) triggers a marked enhancement in r1 = 6.99 mM(-1) s(-1) at 4.7 T (60% increase). The construct is highly selective for Ca(2+) over competitive metal ions at extracellular concentration. The r1 is modulated by changes in the hydration number (0.2 to 1.05), which was confirmed by luminescence emission lifetimes of the analogous Eu(3+) complex. T1 phantom images establish the capability of complex of visualizing changes in [Ca(2+)] by MRI.
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Affiliation(s)
- Jyoti Tanwar
- Institute of Nuclear Medicine and Allied Sciences, Brig S. K. Mazumdar Road, Delhi 110054, India; Department of Chemistry, University of Delhi, Delhi 110054, India
| | - Anupama Datta
- Institute of Nuclear Medicine and Allied Sciences, Brig S. K. Mazumdar Road, Delhi 110054, India.
| | - Kanchan Chauhan
- Institute of Nuclear Medicine and Allied Sciences, Brig S. K. Mazumdar Road, Delhi 110054, India
| | - S Senthil Kumaran
- Department of N.M.R. and MRI, All India Institute of Medical Sciences, New Delhi, India
| | - Anjani K Tiwari
- Institute of Nuclear Medicine and Allied Sciences, Brig S. K. Mazumdar Road, Delhi 110054, India
| | - K Ganesh Kadiyala
- Institute of Nuclear Medicine and Allied Sciences, Brig S. K. Mazumdar Road, Delhi 110054, India; Department of Chemistry, University of Delhi, Delhi 110054, India
| | - Sunil Pal
- Institute of Nuclear Medicine and Allied Sciences, Brig S. K. Mazumdar Road, Delhi 110054, India
| | - M Thirumal
- Department of Chemistry, University of Delhi, Delhi 110054, India
| | - Anil K Mishra
- Institute of Nuclear Medicine and Allied Sciences, Brig S. K. Mazumdar Road, Delhi 110054, India.
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9
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Skår H, Seland JG, Liang Y, Frøystein NÅ, Törnroos KW, Anwander R. Screening of the Relaxivity of Gadolinium-Loaded Periodic Mesoporous Silica Functionalized by Means of Soft Metalorganic Silylamide Grafting. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300756] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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10
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Placidi MP, Botta M, Kálmán FK, Hagberg GE, Baranyai Z, Krenzer A, Rogerson AK, Tóth I, Logothetis NK, Angelovski G. Aryl-Phosphonate Lanthanide Complexes and Their Fluorinated Derivatives: Investigation of Their Unusual Relaxometric Behavior and Potential Application as Dual Frequency1H/19F MRI Probes. Chemistry 2013; 19:11644-60. [DOI: 10.1002/chem.201300763] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Indexed: 11/06/2022]
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11
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Napolitano R, Pariani G, Fedeli F, Baranyai Z, Aswendt M, Aime S, Gianolio E. Synthesis and relaxometric characterization of a MRI Gd-based probe responsive to glutamic acid decarboxylase enzymatic activity. J Med Chem 2013; 56:2466-77. [PMID: 23469759 DOI: 10.1021/jm301831f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Novel contrast agent based systems, which selectively visualize specific cells, e.g., neurons in the brain, would be of substantial importance for the fast developing field of molecular magnetic resonance imaging (MRI). We report here the synthesis and in vitro validation of a Gd(III)-based contrast agent designed to act as an MRI responsive probe for imaging the activity of the enzyme glutamic acid decarboxylase (GAD) present in neurons. Upon the action of the enzyme, the Gd(III) complex increases its hydration sphere and takes on a residual positive charge that promotes its binding to endogenous macromolecules. Both effects contribute in a synergic way to generate a marked relaxation enhancement, which directly reports enzyme activity and will allow activity detection of GAD positive cells in vitro and in vivo selectively.
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Affiliation(s)
- Roberta Napolitano
- Department of Molecular Biotechnologies and Health Sciences and Molecular Imaging Center, University of Torino, Turin, Italy
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12
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Is there a path beyond BOLD? Molecular imaging of brain function. Neuroimage 2012; 62:1208-15. [PMID: 22406355 DOI: 10.1016/j.neuroimage.2012.02.076] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Revised: 02/18/2012] [Accepted: 02/27/2012] [Indexed: 12/20/2022] Open
Abstract
The dependence of BOLD on neuro-vascular coupling leaves it many biological steps removed from direct monitoring of neural function. MRI based approaches have been developed aimed at reporting more directly on brain function. These include: manganese enhanced MRI as a surrogate for calcium ion influx; agents responsive to calcium concentrations; approaches to measure membrane potential; agents to measure neurotransmitters; and strategies to measure gene expression. This work has led to clever design of molecular imaging tools and many contributions to studies of brain function in animal models. However, a robust approach that has potential to get MRI closer to neurons in the human brain has not yet emerged.
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13
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Placidi MP, Engelmann J, Natrajan LS, Logothetis NK, Angelovski G. An aryl-phosphonate appended macrocyclic platform for lanthanide based bimodal imaging agents. Chem Commun (Camb) 2011; 47:11534-6. [DOI: 10.1039/c1cc14437e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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