1
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Simon J, Schwalm M, Morstein J, Trauner D, Jasanoff A. Mapping light distribution in tissue by using MRI-detectable photosensitive liposomes. Nat Biomed Eng 2023; 7:313-322. [PMID: 36550300 PMCID: PMC11232483 DOI: 10.1038/s41551-022-00982-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 11/04/2022] [Indexed: 12/24/2022]
Abstract
Characterizing sources and targets of illumination in living tissue is challenging. Here we show that spatial distributions of light in tissue can be mapped by using magnetic resonance imaging (MRI) in the presence of photosensitive nanoparticle probes. Each probe consists of a reservoir of paramagnetic molecules enclosed by a liposomal membrane incorporating photosensitive lipids. Incident light causes the photoisomerization of the lipids and alters hydrodynamic exchange across the membrane, thereby affecting longitudinal relaxation-weighted contrast in MRI. We injected the nanoparticles into the brains of live rats and used MRI to map responses to illumination profiles characteristic of widely used applications of photostimulation, photometry and phototherapy. The responses deviated from simple photon propagation models and revealed signatures of light scattering and nonlinear responsiveness. Paramagnetic liposomal nanoparticles may enable MRI to map a broad range of optical phenomena in deep tissue and other opaque environments.
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Affiliation(s)
- Jacob Simon
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Miriam Schwalm
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | | | - Dirk Trauner
- Department of Chemistry, New York University, New York, NY, USA
| | - Alan Jasanoff
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
- Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA.
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
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2
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Geng W, Zheng Z, Guo D. Supramolecular design based activatable magnetic resonance imaging. VIEW 2020. [DOI: 10.1002/viw.20200059] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Affiliation(s)
- Wen‐Chao Geng
- College of Chemistry Key Laboratory of Functional Polymer Materials (Ministry of Education) State Key Laboratory of Elemento‐Organic Chemistry Nankai University Tianjin P. R. China
| | - Zhe Zheng
- College of Chemistry Key Laboratory of Functional Polymer Materials (Ministry of Education) State Key Laboratory of Elemento‐Organic Chemistry Nankai University Tianjin P. R. China
| | - Dong‐Sheng Guo
- College of Chemistry Key Laboratory of Functional Polymer Materials (Ministry of Education) State Key Laboratory of Elemento‐Organic Chemistry Nankai University Tianjin P. R. China
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3
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Gao M, Shen B, Zhou J, Kapre R, Louie AY, Shaw JT. Synthesis and Comparative Evaluation of Photoswitchable Magnetic Resonance Imaging Contrast Agents. ACS OMEGA 2020; 5:14759-14766. [PMID: 32596613 PMCID: PMC7315594 DOI: 10.1021/acsomega.0c01534] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 05/25/2020] [Indexed: 06/11/2023]
Abstract
A series of spiropyran (SP)-based magnetic resonance imaging (MRI) contrast agents have been synthesized and evaluated for changes in relaxivity resulting from irradiation with visible light. Both electron-donating and electron-withdrawing substituents were appended to the SP ring in order to study the electronic effects on the photochromic and relaxivity properties of these photoswitchable MRI contrast agents. Photoswitches lacking an electron-withdrawing substituent isomerize readily between the merocyanine and SP forms, while the addition of a nitro group prevents this process. Complexes capable of isomerizing were demonstrated to effect a change in the relaxivity of the appended gadolinium complex.
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Affiliation(s)
- Mingchun Gao
- Department
of Chemistry, University of California,
Davis, One Shields Avenue, Davis, California 95616, United States
| | - Bowen Shen
- Chemistry
Graduate Group, University of California,
Davis, One Shields Avenue, Davis, California 95616, United States
| | - Junhan Zhou
- Chemistry
Graduate Group, University of California,
Davis, One Shields Avenue, Davis, California 95616, United States
| | - Rohan Kapre
- Department
of Biomedical Engineering, University of
California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Angelique Y. Louie
- Chemistry
Graduate Group, University of California,
Davis, One Shields Avenue, Davis, California 95616, United States
- Department
of Biomedical Engineering, University of
California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Jared T. Shaw
- Department
of Chemistry, University of California,
Davis, One Shields Avenue, Davis, California 95616, United States
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4
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Shen B, Gao M, Franco FC, Kapre R, Zhou J, Li X, Garcia J, Shaw JT, Louie AY. Effect of Structure and Intramolecular Distances on Photoswitchable Magnetic Resonance Imaging Contrast Agents. J Org Chem 2020; 85:7333-7341. [PMID: 32397710 DOI: 10.1021/acs.joc.0c00706] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Light-activated sensors are of great interest for biological applications but are limited by the depth of penetration of light. We have been interested in transducing light activation to a magnetic signal that can be detected through noninvasive imaging by magnetic resonance imaging (MRI). We have previously developed agents incorporating spiropyran derivatives as the sensing moiety and characterized features that influence photoswitching; however, we found the MRI response to be unpredictable. In this work, we delve deeper into the potential mechanisms for the observed MRI responses in an effort to better understand the structural effects on controlling magnetic properties. A series of light-activatable MRI contrast agents were synthesized and characterized to assess the effect of spiropyran positioning on contrast agent functions and properties. These compounds are based on the same spiropyran skeleton, also named 1',3',3'-trimethyl-6-nitrospiro[chromene-2,2-indoline], which is linked with an MRI contrast agent, gadolinium-1,4,7,10-tetraazacyclododecane-1,4,7-triacetate (DO3A). We investigated the photo-to-magnetic conversion properties of these novel compounds by adjusting linker lengths over a range from three to seven methylene groups. The primary results indicated that the contrast agent with a five-carbon linker (25) showed the highest light-sensing ability after irradiation with visible light. The results will aid in the design of future spiropyran-based MRI sensors.
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Affiliation(s)
- Bowen Shen
- Chemistry Graduate Group, University of California, One Shields Ave, Davis, California 95616, United States
| | - Mingchun Gao
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Francisco C Franco
- Chemistry Department, De La Salle University, 2401 Taft Avenue, 0922 Manila, Philippines
| | - Rohan Kapre
- Department of Biomedical Engineering, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Junhan Zhou
- Chemistry Graduate Group, University of California, One Shields Ave, Davis, California 95616, United States
| | - Xinzhe Li
- Department of Biomedical Engineering, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Joel Garcia
- Chemistry Department, De La Salle University, 2401 Taft Avenue, 0922 Manila, Philippines
| | - Jared T Shaw
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Angelique Y Louie
- Chemistry Graduate Group, University of California, One Shields Ave, Davis, California 95616, United States.,Department of Biomedical Engineering, University of California, One Shields Avenue, Davis, California 95616, United States
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5
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Pinto SM, Tomé V, Calvete MJ, Castro MMC, Tóth É, Geraldes CF. Metal-based redox-responsive MRI contrast agents. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.03.014] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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6
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Hydration number: crucial role in nuclear magnetic relaxivity of Gd(III) chelate-based nanoparticles. Sci Rep 2017; 7:14010. [PMID: 29070882 PMCID: PMC5656664 DOI: 10.1038/s41598-017-14409-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Accepted: 10/09/2017] [Indexed: 12/28/2022] Open
Abstract
Today, nanostructure-based contrast agents (CA) are emerging in the field of magnetic resonance imaging (MRI). Their sensitivity is reported as greatly improved in comparison to commercially used chelate-based ones. The present work is aimed at revealing the factors governing the efficiency of longitudinal magnetic relaxivity (r1) in aqueous colloids of core-shell Gd(III)-based nanoparticles. We report for the first time on hydration number (q) of gadolinium(III) as a substantial factor in controlling r1 values of polyelectrolyte-stabilized nanoparticles built from water insoluble complexes of Gd(III). The use of specific complex structure enables to reveal the impact of the inner-sphere hydration number on both r1 values for the Gd(III)-based nanoparticles and the photophysical properties of their luminescent Tb(III) and Eu(III) counterparts. The low hydration of TTA-based Gd(III) complexes (q ≈ 1) agrees well with the poor relaxivity values (r1 = 2.82 mM-1s-1 and r2 = 3.95 mM-1s-1), while these values tend to increase substantially (r1 = 12.41 mM-1s-1, r2 = 14.36 mM-1s-1) for aqueous Gd(III)-based colloids, when macrocyclic 1,3-diketonate is applied as the ligand (q ≈ 3). The regularities obtained in this work are fundamental in understanding the efficiency of MRI probes in the fast growing field of nanoparticulate contrast agents.
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7
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Wang Y, Wang X, Meng Q, Jia H, Zhang R, Zhu P, Song R, Feng H, Zhang Z. A gadolinium(III)-coumarin complex based MRI/Fluorescence bimodal probe for the detection of fluoride ion in aqueous medium. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.08.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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8
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Activatable interpolymer complex-superparamagnetic iron oxide nanoparticles as magnetic resonance contrast agents sensitive to oxidative stress. Colloids Surf B Biointerfaces 2017; 158:578-588. [PMID: 28750340 DOI: 10.1016/j.colsurfb.2017.07.025] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 06/29/2017] [Accepted: 07/08/2017] [Indexed: 12/14/2022]
Abstract
Magnetic resonance contrast agents that can be activated in response to specific triggers hold potential as molecular biosensors that may be of great utility in non-invasive disease diagnosis. We developed an activatable agent based on superparamagnetic iron oxide nanoparticles (SPIOs) that is sensitive to oxidative stress, a factor in the pathophysiology of numerous diseases. SPIOs were coated with poly(ethylene glycol) (PEG) and complexed with poly(gallol), a synthetic tannin. Hydrogen bonding between PEG and poly(gallol) creates a complexed layer around the SPIO that decreases the interaction of solute water with the SPIO, attenuating its magnetic resonance relaxivity. The complexed interpolymer nanoparticle is in an OFF state (decreased T2 contrast), where the contrast agent has a low T2 relaxivity of 7±2mM-1s-1. In the presence of superoxides, the poly(gallol) is oxidized and the polymers decomplex, allowing solute water to again interact with the SPIO, representing an ON state (increased T2 contrast) with a T2 relaxivity of 70±10mM-1s-1. These contrast agents show promise as effective sensors for diseases characterized in part by oxidative stress such as atherosclerosis, diabetes, and cancer.
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9
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Abstract
Magnetic resonance imaging (MRI) is a non-invasive imaging technique with widespread use in diagnosis. Frequently, contrast in MRI is enhanced with the aid of a contrast agent, among which smart, responsive, OFF/ON or activatable probes are of particular interest. These kinds of probes elicit a response to selective stimuli, evidencing the presence of enzymes or acidic pH, for instance. In this review, we will focus on smart probes that are detectable by both 1H and 19F MRI, frequently based on nanomaterials. We will discuss the triggering factors and the strategies employed thus far to activate each probe.
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Affiliation(s)
- Monica Carril
- CIC biomaGUNE, Paseo Miramón 182, 20014 Donostia, San Sebastian, Spain
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10
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Advances in Monitoring Cell-Based Therapies with Magnetic Resonance Imaging: Future Perspectives. Int J Mol Sci 2017; 18:ijms18010198. [PMID: 28106829 PMCID: PMC5297829 DOI: 10.3390/ijms18010198] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 01/05/2017] [Accepted: 01/10/2017] [Indexed: 01/07/2023] Open
Abstract
Cell-based therapies are currently being developed for applications in both regenerative medicine and in oncology. Preclinical, translational, and clinical research on cell-based therapies will benefit tremendously from novel imaging approaches that enable the effective monitoring of the delivery, survival, migration, biodistribution, and integration of transplanted cells. Magnetic resonance imaging (MRI) offers several advantages over other imaging modalities for elucidating the fate of transplanted cells both preclinically and clinically. These advantages include the ability to image transplanted cells longitudinally at high spatial resolution without exposure to ionizing radiation, and the possibility to co-register anatomical structures with molecular processes and functional changes. However, since cellular MRI is still in its infancy, it currently faces a number of challenges, which provide avenues for future research and development. In this review, we describe the basic principle of cell-tracking with MRI; explain the different approaches currently used to monitor cell-based therapies; describe currently available MRI contrast generation mechanisms and strategies for monitoring transplanted cells; discuss some of the challenges in tracking transplanted cells; and suggest future research directions.
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11
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Abstract
This account describes lanthanide coordination chemistry with a focus on the similarities between lanthanide complexes used in catalysis and those used as contrast agents in magnetic resonance imaging.
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Affiliation(s)
- Matthew J. Allen
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202, United States, Fax: 313-577-8822
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12
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Shuhendler AJ, Ye D, Brewer KD, Bazalova-Carter M, Lee KH, Kempen P, Dane Wittrup K, Graves EE, Rutt B, Rao J. Molecular Magnetic Resonance Imaging of Tumor Response to Therapy. Sci Rep 2015; 5:14759. [PMID: 26440059 PMCID: PMC4594000 DOI: 10.1038/srep14759] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Accepted: 09/02/2015] [Indexed: 11/09/2022] Open
Abstract
Personalized cancer medicine requires measurement of therapeutic efficacy as early as possible, which is optimally achieved by three-dimensional imaging given the heterogeneity of cancer. Magnetic resonance imaging (MRI) can obtain images of both anatomy and cellular responses, if acquired with a molecular imaging contrast agent. The poor sensitivity of MRI has limited the development of activatable molecular MR contrast agents. To overcome this limitation of molecular MRI, a novel implementation of our caspase-3-sensitive nanoaggregation MRI (C-SNAM) contrast agent is reported. C-SNAM is triggered to self-assemble into nanoparticles in apoptotic tumor cells, and effectively amplifies molecular level changes through nanoaggregation, enhancing tissue retention and spin-lattice relaxivity. At one-tenth the current clinical dose of contrast agent, and following a single imaging session, C-SNAM MRI accurately measured the response of tumors to either metronomic chemotherapy or radiation therapy, where the degree of signal enhancement is prognostic of long-term therapeutic efficacy. Importantly, C-SNAM is inert to immune activation, permitting radiation therapy monitoring.
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Affiliation(s)
- Adam J Shuhendler
- Molecular Imaging Program at Stanford, Stanford, California 94305, USA.,Departments of Radiology, Stanford, California 94305, USA
| | - Deju Ye
- Molecular Imaging Program at Stanford, Stanford, California 94305, USA.,Departments of Radiology, Stanford, California 94305, USA
| | - Kimberly D Brewer
- Molecular Imaging Program at Stanford, Stanford, California 94305, USA.,Departments of Radiology, Stanford, California 94305, USA
| | - Magdalena Bazalova-Carter
- Molecular Imaging Program at Stanford, Stanford, California 94305, USA.,Radiation Oncology, Stanford, California 94305, USA
| | - Kyung-Hyun Lee
- Molecular Imaging Program at Stanford, Stanford, California 94305, USA.,Departments of Radiology, Stanford, California 94305, USA
| | - Paul Kempen
- Materials Science and Engineering, Stanford University, Stanford, California 94305, USA
| | - K Dane Wittrup
- Department of Chemical Engineering, Department of Biological Engineering, and Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139, USA
| | - Edward E Graves
- Molecular Imaging Program at Stanford, Stanford, California 94305, USA.,Radiation Oncology, Stanford, California 94305, USA
| | - Brian Rutt
- Molecular Imaging Program at Stanford, Stanford, California 94305, USA.,Departments of Radiology, Stanford, California 94305, USA
| | - Jianghong Rao
- Molecular Imaging Program at Stanford, Stanford, California 94305, USA.,Departments of Radiology, Stanford, California 94305, USA
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13
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Suchý M, Milne M, Elmehriki AAH, McVicar N, Li AX, Bartha R, Hudson RHE. Introduction of Peripheral Carboxylates to Decrease the Charge on Tm3+ DOTAM-Alkyl Complexes: Implications for Detection Sensitivity and in Vivo Toxicity of PARACEST MRI Contrast Agents. J Med Chem 2015. [DOI: 10.1021/acs.jmedchem.5b00621] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Mojmír Suchý
- Department
of Chemistry, The University of Western Ontario, Chemistry Building, London, Ontario N6A 5B7, Canada
- Department
of Medical Biophysics, The University of Western Ontario, London, Ontario N6A 5K8, Canada
| | - Mark Milne
- Department
of Chemistry, The University of Western Ontario, Chemistry Building, London, Ontario N6A 5B7, Canada
| | - Adam A. H. Elmehriki
- Department
of Chemistry, The University of Western Ontario, Chemistry Building, London, Ontario N6A 5B7, Canada
| | - Nevin McVicar
- Department
of Medical Biophysics, The University of Western Ontario, London, Ontario N6A 5K8, Canada
| | - Alex X. Li
- Department
of Medical Biophysics, The University of Western Ontario, London, Ontario N6A 5K8, Canada
| | - Robert Bartha
- Department
of Medical Biophysics, The University of Western Ontario, London, Ontario N6A 5K8, Canada
| | - Robert H. E. Hudson
- Department
of Chemistry, The University of Western Ontario, Chemistry Building, London, Ontario N6A 5B7, Canada
- Centre
for Advanced Materials and Biomaterials Research, The University of Western Ontario, London, Ontario N6A 5B7, Canada
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14
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De León-Rodríguez LM, Martins AF, Pinho MC, Rofsky NM, Sherry AD. Basic MR relaxation mechanisms and contrast agent design. J Magn Reson Imaging 2015; 42:545-65. [PMID: 25975847 DOI: 10.1002/jmri.24787] [Citation(s) in RCA: 123] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Accepted: 10/11/2014] [Indexed: 12/22/2022] Open
Abstract
The diagnostic capabilities of magnetic resonance imaging (MRI) have undergone continuous and substantial evolution by virtue of hardware and software innovations and the development and implementation of exogenous contrast media. Thirty years since the first MRI contrast agent was approved for clinical use, a reliance on MR contrast media persists, largely to improve image quality with higher contrast resolution and to provide additional functional characterization of normal and abnormal tissues. Further development of MR contrast media is an important component in the quest for continued augmentation of diagnostic capabilities. In this review we detail the many important considerations when pursuing the design and use of MR contrast media. We offer a perspective on the importance of chemical stability, particularly kinetic stability, and how this influences one's thinking about the safety of metal-ligand-based contrast agents. We discuss the mechanisms involved in MR relaxation in the context of probe design strategies. A brief description of currently available contrast agents is accompanied by an in-depth discussion that highlights promising MRI contrast agents in the development of future clinical and research applications. Our intention is to give a diverse audience an improved understanding of the factors involved in developing new types of safe and highly efficient MR contrast agents and, at the same time, provide an appreciation of the insights into physiology and disease that newer types of responsive agents can provide.
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Affiliation(s)
| | - André F Martins
- Department of Chemistry, University of Texas at Dallas, Richardson, Texas, USA
| | - Marco C Pinho
- Department of Radiology and the Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Neil M Rofsky
- Department of Radiology and the Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - A Dean Sherry
- Department of Chemistry, University of Texas at Dallas, Richardson, Texas, USA.,Department of Radiology and the Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas, USA
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15
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Ekanger LA, Allen MJ. Overcoming the concentration-dependence of responsive probes for magnetic resonance imaging. Metallomics 2015; 7:405-21. [PMID: 25579206 PMCID: PMC4357574 DOI: 10.1039/c4mt00289j] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
In magnetic resonance imaging, contrast agents are molecules that increase the contrast-to-noise ratio of non-invasively acquired images. The information gained from magnetic resonance imaging can be increased using responsive contrast agents that undergo chemical changes, and consequently changes to contrast enhancement, for example in response to specific biomarkers that are indicative of diseases. A major limitation with modern responsive contrast agents is concentration-dependence that requires the concentration of contrast agent to be known: an extremely challenging task in vivo. Here, we review advances in several strategies aimed at overcoming the concentration-dependent nature of responsive contrast agents.
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Affiliation(s)
- Levi A Ekanger
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202, USA.
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16
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Jeanmaire D, Timco GA, Gennari A, Sproules S, Williams KJ, Winpenny REP, Tirelli N. Binary behaviour of an oxidation-responsive MRI nano contrast agent. Chem Commun (Camb) 2015; 51:1074-6. [PMID: 25447319 DOI: 10.1039/c4cc08024f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2024]
Abstract
A new nano contrast agent has been prepared incorporating a molecular magnet in oxidation-responsive nanoparticles; this system has shown a remarkable sensitivity to hydrogen peroxide (detection down to at least 40 μM), which was used as a model reactive oxygen species. Surprisingly, the response had a binary (off/on) character, due to a non-linear cascade relation between extent of oxidation and water permeability in the particles.
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Affiliation(s)
- Damien Jeanmaire
- Manchester Pharmacy School, University of Manchester, Oxford Road, Manchester M13 9PT, UK
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17
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Tsitovich PB, Burns PJ, McKay AM, Morrow JR. Redox-activated MRI contrast agents based on lanthanide and transition metal ions. J Inorg Biochem 2014; 133:143-54. [DOI: 10.1016/j.jinorgbio.2014.01.016] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 01/14/2014] [Accepted: 01/14/2014] [Indexed: 12/17/2022]
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18
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Giardiello M, Botta M, Lowe MP. pH-Responsive Lanthanide Complexes Based on Reversible Ligation of a Diphenylphosphinamide. Inorg Chem 2013; 52:14264-9. [DOI: 10.1021/ic402205j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Marco Giardiello
- Department
of Chemistry, University
Road, University of Leicester, Leicester LE1 7RH, U.K
| | - Mauro Botta
- Dipartimento
di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale “Amedeo Avogadro”, Viale Teresa Michel 11, I-15121 Alessandria, Italy
| | - Mark P. Lowe
- Department
of Chemistry, University
Road, University of Leicester, Leicester LE1 7RH, U.K
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19
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Mulder WJM, McMahon MT, Nicolay K. The evolution of MRI probes: from the initial development to state-of-the-art applications. NMR IN BIOMEDICINE 2013; 26:725-727. [PMID: 23784954 DOI: 10.1002/nbm.2976] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Accepted: 04/20/2013] [Indexed: 06/02/2023]
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20
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Parzy E, Bouchaud V, Massot P, Voisin P, Koonjoo N, Moncelet D, Franconi JM, Thiaudière E, Mellet P. Overhauser-enhanced MRI of elastase activity from in vitro human neutrophil degranulation. PLoS One 2013; 8:e57946. [PMID: 23469112 PMCID: PMC3585236 DOI: 10.1371/journal.pone.0057946] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2012] [Accepted: 01/28/2013] [Indexed: 12/16/2022] Open
Abstract
Background Magnetic resonance imaging can reveal exquisite anatomical details. However several diseases would benefit from an imaging technique able to specifically detect biochemical alterations. In this context protease activity imaging is one of the most promising areas of research. Methodology/Principal Findings We designed an elastase substrate by grafting stable nitroxide free radicals on soluble elastin. This substrate generates a high Overhauser magnetic resonance imaging (OMRI) contrast upon digestion by the target proteases through the modulation of its rotational correlation time. The sensitivity is sufficient to generate contrasted images of the degranulation of neutrophils induced by a calcium ionophore from 2×104 cells per milliliter, well under the physiological neutrophils concentrations. Conclusions/Significance These ex-vivo experiments give evidence that OMRI is suitable for imaging elastase activity from neutrophil degranulation. Provided that a fast protease-substrate is used these results open the door to better diagnoses of a number of important pathologies (cystic fibrosis, inflammation, pancreatitis) by OMRI or Electron Paramagnetic Resonance Imaging in vivo. It also provides a long-expected method to monitor anti-protease treatments efficiency and help pharmaceutical research.
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Affiliation(s)
- Elodie Parzy
- CRMSB, UMR 5536, University Bordeaux Segalen, CNRS, Bordeaux, France
| | | | - Philippe Massot
- CRMSB, UMR 5536, University Bordeaux Segalen, CNRS, Bordeaux, France
| | - Pierre Voisin
- CRMSB, UMR 5536, University Bordeaux Segalen, CNRS, Bordeaux, France
| | - Neha Koonjoo
- CRMSB, UMR 5536, University Bordeaux Segalen, CNRS, Bordeaux, France
| | - Damien Moncelet
- CRMSB, UMR 5536, University Bordeaux Segalen, CNRS, Bordeaux, France
| | | | - Eric Thiaudière
- CRMSB, UMR 5536, University Bordeaux Segalen, CNRS, Bordeaux, France
| | - Philippe Mellet
- CRMSB, UMR 5536, University Bordeaux Segalen, CNRS, Bordeaux, France
- INSERM, Bordeaux, France
- * E-mail:
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Saha I, Chaffee KE, Duanmu C, Woods BM, Stokes AM, Buck LE, Walkup LL, Sattenapally N, Huggenvik J, Gao Y, Goodson BM. pH-Sensitive MR Responses Induced by Dendron-Functionalized SPIONs. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2013; 117:1893-1903. [PMID: 23494078 PMCID: PMC3594091 DOI: 10.1021/jp306128v] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report a series of investigations of the pH-sensitive magnetic resonance (MR) responses of various surface-functionalized SPIONs (superparamagnetic iron oxide nanoparticles). First, functionalization of ~12 nm highly monocrystalline SPION cores with three different generations of melamine-dendrons was optimized to give agents with high molar relaxivities (e.g. R2m ~300 mM-1·s-1 at 7 T and R1m ~20-30 mM-1·s-1 at 0.5 T) and excellent aqueous stabilities. Molar relaxivities were found to exhibit great sensitivity to pH at physiologically-relevant ionic strengths, with sharp inflections observed at pH values near the pKa of the melamine monomer. The strength of the effect was observed to grow with increasing dendron generation (with concomitant shift in the position of the main pH inflection). Opposing behavior in R2m and R2m * trends may be exploited to provide a ratiometric MR response to pH. Combined with TEM and corresponding MR measurements from solutions of varying ionic strengths, these results are consistent with the pH-sensitive behavior originating from transient, reversible SPION clustering modulated by an interplay between SPION surface charge density and solution ionic strength. Studies of SPION cellular uptake and MR response in HeLa cell cultures are also presented. Finally, comparisons with the MR responses of SPIONs with alternative functionalities-derivatives of nitrilotriacetic acid or poly(1-vinylimidazole)-indicate that these types of pH-sensitive MR responses can be highly dependent upon the chemical composition of the surface species (and thus amenable to modulation through rational design).
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Affiliation(s)
- Indrajit Saha
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL 62901
| | - Kathleen E. Chaffee
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL 62901
| | - Chuansong Duanmu
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL 62901
| | - Brooke M. Woods
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL 62901
| | | | - Laura E. Buck
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL 62901
| | - Laura L. Walkup
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL 62901
| | - Narsimha Sattenapally
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL 62901
| | - Jodi Huggenvik
- Department of Physiology, Southern Illinois University, Carbondale, IL 62901
| | - Yong Gao
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL 62901
| | - Boyd M. Goodson
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL 62901
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