1
|
Zakaria ABM, Huang Y, Coman D, Mishra SK, Mihailovic JM, Maritim S, Rojas-Quijano FA, Jurek P, Kiefer GE, Hyder F. Methylated tetra-amide derivatives of paramagnetic complexes for magnetic resonance biosensing with both BIRDS and CEST. NMR IN BIOMEDICINE 2022; 35:e4687. [PMID: 34970801 DOI: 10.1002/nbm.4687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 12/22/2021] [Accepted: 12/25/2021] [Indexed: 06/14/2023]
Abstract
Paramagnetic agents that utilize two mechanisms to provide physiological information by magnetic resonance imaging (MRI) and magnetic resonance spectroscopic imaging (MRSI) are described. MRI with chemical exchange saturation transfer (CEST) takes advantage of the agent's exchangeable protons (e.g., -OH or -NHx , where 2 ≥ x ≥ 1) to create pH contrast. The agent's incorporation of non-exchangeable protons (e.g., -CHy , where 3 ≥ y ≥ 1) makes it possible to map tissue temperature and/or pH using an MRSI method called biosensor imaging of redundant deviation in shifts (BIRDS). Hybrid probes based upon 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetate chelate (DOTA4- ) and its methylated analog (1,4,7,10-tetraazacyclododecane-α, α', α″, α‴-tetramethyl-1,4,7,10-tetraacetate, DOTMA4- ) were synthesized, and modified to create new tetra-amide chelates. Addition of several methyl groups per pendent arm of the symmetrical chelates, positioned proximally and distally to thulium ions (Tm3+ ), gave rise to favorable BIRDS properties (i.e., high signal-to-noise ratio (SNR) from non-exchangeable methyl proton peaks) and CEST responsiveness (i.e., from amide exchangeable protons). Structures of the Tm3+ probes elucidate the influence of methyl group placement on sensor performance. An eight-coordinate geometry with high symmetry was observed for the complexes: Tm-L1 was based on DOTA4- , whereas Tm-L2 and Tm-L3 were based on DOTMA4- , where the latter contained an additional carboxylate at the distal end of each arm. The distance of Tm3+ from terminal methyl carbons is a key determinant for sustaining BIRDS temperature sensitivity without compromising CEST pH contrast; however, water solubility was influenced by introduction of hydrophobic methyl groups and hydrophilic carboxylate. Combined BIRDS and CEST detection of Tm-L2, which features two high-SNR methyl peaks and a strong amide CEST peak, should enable simultaneous temperature and pH measurements for high-resolution molecular imaging in vivo.
Collapse
Affiliation(s)
- Abul B M Zakaria
- Department of Radiology and Biomedical Imaging, Yale University, New Haven, Connecticut, USA
- Magnetic Resonance Research Center, Yale University, New Haven, Connecticut, USA
| | - Yuegao Huang
- Department of Radiology and Biomedical Imaging, Yale University, New Haven, Connecticut, USA
- Magnetic Resonance Research Center, Yale University, New Haven, Connecticut, USA
| | - Daniel Coman
- Department of Radiology and Biomedical Imaging, Yale University, New Haven, Connecticut, USA
- Magnetic Resonance Research Center, Yale University, New Haven, Connecticut, USA
| | - Sandeep K Mishra
- Department of Radiology and Biomedical Imaging, Yale University, New Haven, Connecticut, USA
- Magnetic Resonance Research Center, Yale University, New Haven, Connecticut, USA
| | - Jelena M Mihailovic
- Department of Radiology and Biomedical Imaging, Yale University, New Haven, Connecticut, USA
- Magnetic Resonance Research Center, Yale University, New Haven, Connecticut, USA
| | - Samuel Maritim
- Department of Radiology and Biomedical Imaging, Yale University, New Haven, Connecticut, USA
- Magnetic Resonance Research Center, Yale University, New Haven, Connecticut, USA
| | | | | | | | - Fahmeed Hyder
- Department of Radiology and Biomedical Imaging, Yale University, New Haven, Connecticut, USA
- Magnetic Resonance Research Center, Yale University, New Haven, Connecticut, USA
- Department of Biomedical Engineering, Yale University, New Haven, Connecticut, USA
| |
Collapse
|
2
|
New PET radiopharmaceuticals for cancer imaging. Nucl Med Mol Imaging 2022. [DOI: 10.1016/b978-0-12-822960-6.00061-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
3
|
Jia Y, Wang C, Zheng J, Lin G, Ni D, Shen Z, Huang B, Li Y, Guan J, Hong W, Chen Y, Wu R. Novel nanomedicine with a chemical-exchange saturation transfer effect for breast cancer treatment in vivo. J Nanobiotechnology 2019; 17:123. [PMID: 31847857 PMCID: PMC6918642 DOI: 10.1186/s12951-019-0557-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Accepted: 12/10/2019] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Nanomedicine is a promising new approach to cancer treatment that avoids the disadvantages of traditional chemotherapy and improves therapeutic indices. However, the lack of a real-time visualization imaging technology to monitor drug distribution greatly limits its clinical application. Image-tracked drug delivery is of great clinical interest; it is useful for identifying those patients for whom the therapy is more likely to be beneficial. This paper discusses a novel nanomedicine that displays features of nanoparticles and facilitates functional magnetic resonance imaging but is challenging to prepare. RESULTS To achieve this goal, we synthesized an acylamino-containing amphiphilic block copolymer (polyethylene glycol-polyacrylamide-polyacetonitrile, PEG-b-P(AM-co-AN)) by reversible addition-fragmentation chain transfer (RAFT) polymerization. The PEG-b-P(AM-co-AN) has chemical exchange saturation transfer (CEST) effects, which enable the use of CEST imaging for monitoring nanocarrier accumulation and providing molecular information of pathological tissues. Based on PEG-b-P(AM-co-AN), a new nanomedicine PEG-PAM-PAN@DOX was constructed by nano-precipitation. The self-assembling nature of PEG-PAM-PAN@DOX made the synthesis effective, straightforward, and biocompatible. In vitro studies demonstrate decreased cytotoxicity of PEG-PAM-PAN@DOX compared to free doxorubicin (half-maximal inhibitory concentration (IC50), mean ~ 0.62 μg/mL vs. ~ 5 μg/mL), and the nanomedicine more efficiently entered the cytoplasm and nucleus of cancer cells to kill them. Further, in vivo animal experiments showed that the nanomedicine developed was not only effective against breast cancer, but also displayed an excellent sensitive CEST effect for monitoring drug accumulation (at about 0.5 ppm) in tumor areas. The CEST signal of post-injection 2 h was significantly higher than that of pre-injection (2.17 ± 0.88% vs. 0. 09 ± 0.75%, p < 0.01). CONCLUSIONS The nanomedicine with CEST imaging reflects the characterization of tumors and therapeutic functions has great potential medical applications.
Collapse
Affiliation(s)
- Yanlong Jia
- Department of Radiology, Second Affiliated Hospital, Shantou University Medical College, Shantou, 515041, People's Republic of China
| | - Chaochao Wang
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, People's Republic of China
| | - Jiehua Zheng
- Department of General Surgery, Second Affiliated Hospital, Shantou University Medical College, Shantou, 515041, People's Republic of China
| | - Guisen Lin
- Department of Radiology, Second Affiliated Hospital, Shantou University Medical College, Shantou, 515041, People's Republic of China
| | - Dalong Ni
- Departments of Radiology and Medical Physics, University of Wisconsin-Madison, Madison, WI, 53705, USA
| | - Zhiwei Shen
- Department of Radiology, Second Affiliated Hospital, Shantou University Medical College, Shantou, 515041, People's Republic of China
| | - Baoxuan Huang
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, People's Republic of China
| | - Yan Li
- Department of Radiology, Second Affiliated Hospital, Shantou University Medical College, Shantou, 515041, People's Republic of China
| | - Jitian Guan
- Department of Radiology, Second Affiliated Hospital, Shantou University Medical College, Shantou, 515041, People's Republic of China
| | - Weida Hong
- Department of General Surgery, Second Affiliated Hospital, Shantou University Medical College, Shantou, 515041, People's Republic of China
| | - Yuanfeng Chen
- Department of Radiology, Second Affiliated Hospital, Shantou University Medical College, Shantou, 515041, People's Republic of China
| | - Renhua Wu
- Department of Radiology, Second Affiliated Hospital, Shantou University Medical College, Shantou, 515041, People's Republic of China.
| |
Collapse
|
4
|
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.
Collapse
|
5
|
Kiani A, Esquevin A, Lepareur N, Bourguet P, Le Jeune F, Gauvrit J. Main applications of hybrid PET-MRI contrast agents: a review. CONTRAST MEDIA & MOLECULAR IMAGING 2015; 11:92-8. [PMID: 26632007 DOI: 10.1002/cmmi.1674] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Revised: 09/17/2015] [Accepted: 10/19/2015] [Indexed: 12/29/2022]
Abstract
In medical imaging, the continuous quest to improve diagnostic performance and optimize treatment strategies has led to the use of combined imaging modalities. Positron emission tomography (PET) and computed tomography (CT) is a hybrid imaging existing already for many years. The high spatial and contrast resolution of magnetic resonance imaging (MRI) and the high sensitivity and molecular information from PET imaging are leading to the development of this new hybrid imaging along with hybrid contrast agents. To create a hybrid contrast agent for PET-MRI device, a PET radiotracer needs to be combined with an MRI contrast agent. The most common approach is to add a radioactive isotope to the surface of a small superparamagnetic iron oxide (SPIO) particle. The resulting agents offer a wide range of applications, such as pH variation monitoring, non-invasive angiography and early imaging diagnosis of atherosclerosis. Oncology is the most promising field with the detection of sentinel lymph nodes and the targeting of tumor neoangiogenesis. Oncology and cardiovascular imaging are thus major areas of development for hybrid PET-MRI imaging systems and hybrid contrast agents. The aim is to combine high spatial resolution, high sensitivity, morphological and functional information. Future prospects include the use of specific antibodies and hybrid multimodal PET-MRI-ultrasound-fluorescence imaging with the potential to provide overall pre-, intra- and postoperative patient care.
Collapse
Affiliation(s)
- A Kiani
- Neurofacial Imaging Unit, Department of Radiology, Rennes University Hospital, 2 rue H. Le Guilloux, 35033, Rennes, France
| | - A Esquevin
- Neurofacial Imaging Unit, Department of Radiology, Rennes University Hospital, 2 rue H. Le Guilloux, 35033, Rennes, France.,VisAGeS U746 Unit/Project, INSERM/INRIA, IRISA, UMR CNRS 6074, University of Rennes 1, Beaulieu Campus, 35042, Rennes, France
| | - N Lepareur
- Department of Nuclear Medicine, Eugène Marquis Center, avenue Bataille Flandres Dunkerque, 35042, Rennes, France.,INSERM UMR-S 991 Unit "Liver, Metabolisms and Cancer", University of Rennes 1, 2 rue H. Le Guilloux, 35033, Rennes, France
| | - P Bourguet
- Department of Nuclear Medicine, Eugène Marquis Center, avenue Bataille Flandres Dunkerque, 35042, Rennes, France
| | - F Le Jeune
- Department of Nuclear Medicine, Eugène Marquis Center, avenue Bataille Flandres Dunkerque, 35042, Rennes, France.,EA 4712, "Behavior and Basal Ganglia", University of Rennes 1, 2 rue H. Le Guilloux, 35033, Rennes, France
| | - Jy Gauvrit
- Neurofacial Imaging Unit, Department of Radiology, Rennes University Hospital, 2 rue H. Le Guilloux, 35033, Rennes, France.,VisAGeS U746 Unit/Project, INSERM/INRIA, IRISA, UMR CNRS 6074, University of Rennes 1, Beaulieu Campus, 35042, Rennes, France
| |
Collapse
|
6
|
Oukhatar F, Meudal H, Landon C, Logothetis NK, Platas-Iglesias C, Angelovski G, Tóth É. Macrocyclic Gd3+Complexes with Pendant Crown Ethers Designed for Binding Zwitterionic Neurotransmitters. Chemistry 2015; 21:11226-37. [DOI: 10.1002/chem.201500542] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Indexed: 12/23/2022]
|
7
|
van Duijnhoven SMJ, Robillard MS, Langereis S, Grüll H. Bioresponsive probes for molecular imaging: concepts and in vivo applications. CONTRAST MEDIA & MOLECULAR IMAGING 2015; 10:282-308. [PMID: 25873263 DOI: 10.1002/cmmi.1636] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 01/24/2015] [Accepted: 02/03/2015] [Indexed: 12/30/2022]
Abstract
Molecular imaging is a powerful tool to visualize and characterize biological processes at the cellular and molecular level in vivo. In most molecular imaging approaches, probes are used to bind to disease-specific biomarkers highlighting disease target sites. In recent years, a new subset of molecular imaging probes, known as bioresponsive molecular probes, has been developed. These probes generally benefit from signal enhancement at the site of interaction with its target. There are mainly two classes of bioresponsive imaging probes. The first class consists of probes that show direct activation of the imaging label (from "off" to "on" state) and have been applied in optical imaging and magnetic resonance imaging (MRI). The other class consists of probes that show specific retention of the imaging label at the site of target interaction and these probes have found application in all different imaging modalities, including photoacoustic imaging and nuclear imaging. In this review, we present a comprehensive overview of bioresponsive imaging probes in order to discuss the various molecular imaging strategies. The focus of the present article is the rationale behind the design of bioresponsive molecular imaging probes and their potential in vivo application for the detection of endogenous molecular targets in pathologies such as cancer and cardiovascular disease.
Collapse
Affiliation(s)
- Sander M J van Duijnhoven
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands.,Department of Minimally Invasive Healthcare, Philips Research, Eindhoven, The Netherlands
| | - Marc S Robillard
- Department of Minimally Invasive Healthcare, Philips Research, Eindhoven, The Netherlands
| | - Sander Langereis
- Department of Minimally Invasive Healthcare, Philips Research, Eindhoven, The Netherlands
| | - Holger Grüll
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands.,Department of Minimally Invasive Healthcare, Philips Research, Eindhoven, The Netherlands
| |
Collapse
|
8
|
Mouffouk F, Simão T, Dornelles DF, Lopes AD, Sau P, Martins J, Abu-Salah KM, Alrokayan SA, Rosa da Costa AM, dos Santos NR. Self-assembled polymeric nanoparticles as new, smart contrast agents for cancer early detection using magnetic resonance imaging. Int J Nanomedicine 2014; 10:63-76. [PMID: 25565804 PMCID: PMC4275056 DOI: 10.2147/ijn.s71190] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Early cancer detection is a major factor in the reduction of mortality and cancer management cost. Here we developed a smart and targeted micelle-based contrast agent for magnetic resonance imaging (MRI), able to turn on its imaging capability in the presence of acidic cancer tissues. This smart contrast agent consists of pH-sensitive polymeric micelles formed by self-assembly of a diblock copolymer (poly(ethyleneglycol-b-trimethylsilyl methacrylate)), loaded with a gadolinium hydrophobic complex (tBuBipyGd) and exploits the acidic pH in cancer tissues. In vitro MRI experiments showed that tBuBipyGd-loaded micelles were pH-sensitive, as they turned on their imaging capability only in an acidic microenvironment. The micelle-targeting ability toward cancer cells was enhanced by conjugation with an antibody against the MUC1 protein. The ability of our antibody-decorated micelles to be switched on in acidic microenvironments and to target cancer cells expressing specific antigens, together with its high Gd(III) content and its small size (35–40 nm) reveals their potential use for early cancer detection by MRI.
Collapse
Affiliation(s)
- Fouzi Mouffouk
- Chemistry Department, Faculty of Science, Kuwait University, Safat, Kuwait
| | - Teresa Simão
- IBB - Institute for Biotechnology and Bioengineering, CBME - Centre for Molecular and Structural Biomedicine, Faro, Portugal
| | - Daniel F Dornelles
- IBB - Institute for Biotechnology and Bioengineering, CBME - Centre for Molecular and Structural Biomedicine, Faro, Portugal
| | - André D Lopes
- CIQA-Algarve Chemistry Research Center, Department of Chemistry and Pharmacy, Faculty of Sciences and Technology, University of Algarve, Campus de Gambelas, Faro, Portugal
| | - Pablo Sau
- Centro Radiológico Computarizado SA (CERCO), Seville, Spain
| | - Jorge Martins
- IBB - Institute for Biotechnology and Bioengineering, CBME - Centre for Molecular and Structural Biomedicine, Faro, Portugal ; Department of Biological Sciences and Bioengineering, Faculty of Sciences and Technology, University of Algarve, Campus de Gambelas, Faro, Portugal
| | - Khalid M Abu-Salah
- King Abdullah Institute for Nanotechnology, King Saud University, Riyadh, Saudi Arabia
| | - Salman A Alrokayan
- King Abdullah Institute for Nanotechnology, King Saud University, Riyadh, Saudi Arabia
| | - Ana M Rosa da Costa
- CIQA-Algarve Chemistry Research Center, Department of Chemistry and Pharmacy, Faculty of Sciences and Technology, University of Algarve, Campus de Gambelas, Faro, Portugal
| | - Nuno R dos Santos
- IBB - Institute for Biotechnology and Bioengineering, CBME - Centre for Molecular and Structural Biomedicine, Faro, Portugal
| |
Collapse
|
9
|
Bonnet CS, Caillé F, Pallier A, Morfin JF, Petoud S, Suzenet F, Tóth É. Mechanistic studies of Gd3+-based MRI contrast agents for Zn2+ detection: towards rational design. Chemistry 2014; 20:10959-69. [PMID: 25116889 DOI: 10.1002/chem.201403043] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Indexed: 12/28/2022]
Abstract
A series of novel pyridine-based Gd(3+) complexes have been prepared and studied as potential MRI contrast agents for Zn(2+) detection. By independent assessment of molecular parameters affecting relaxivity, we could interpret the relaxivity changes observed upon Zn(2+) binding in terms of variations of the rotational motion.
Collapse
Affiliation(s)
- Célia S Bonnet
- Centre de Biophysique Moléculaire, CNRS, Rue Charles Sadron, 45071 Orléans (France).
| | | | | | | | | | | | | |
Collapse
|
10
|
Cross section measurements of proton and deuteron induced reactions on natural europium and yields of SPECT-relevant radioisotopes of gadolinium. Appl Radiat Isot 2014; 91:8-16. [PMID: 24880528 DOI: 10.1016/j.apradiso.2014.04.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 04/11/2014] [Accepted: 04/28/2014] [Indexed: 11/22/2022]
Abstract
The existing cross section data of the (nat)Eu(d,x) and (nat)Eu(p,x) reactions relevant for the production of (147,149)Gd were expanded up to 70.9 MeV and 44.8 MeV, respectively. Integral yields of radiogadolinium were calculated, showing production rates higher than for the earlier proposed irradiation of highly enriched (144)Sm with α- or (3)He-particles. The formation of radioisotopic impurities like (151)Gd (T(1/2)=124 d) and (153)Gd (T(1/2)=240 d) was below 5%. Production of (147,)(149)Gd using enriched europium is also discussed.
Collapse
|
11
|
Slack JR, Woods M. The effect of regioisomerism on the coordination chemistry and CEST properties of lanthanide(III) NB-DOTA-tetraamide chelates. J Biol Inorg Chem 2013; 19:173-89. [PMID: 24287873 DOI: 10.1007/s00775-013-1060-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Accepted: 10/24/2013] [Indexed: 01/31/2023]
Abstract
Chemical exchange saturation transfer (CEST) offers many advantages as a method of generating contrast in magnetic resonance images. However, many of the exogenous agents currently under investigation suffer from detection limits that are still somewhat short of what can be achieved with more traditional Gd(3+) agents. To remedy this limitation we have undertaken an investigation of Ln(3+) DOTA-tetraamide chelates (where DOTA is 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) that have unusually rigid ligand structures: the nitrobenzyl derivatives of DOTA-tetraamides with (2-phenylethyl)amide substituents. In this report we examine the effect of incorporating hydrophobic amide substituents on water exchange and CEST. The ligand systems chosen afforded a total of three CEST-active isomeric square antiprismatic chelates; each of these chelates was found to have different water exchange and CEST characteristics. The position of a nitrobenzyl substituent on the macrocyclic ring strongly influenced the way in which the chelate and Ln(3+) coordination cage distorted. These differential distortions were found to affect the rate of water proton exchange in the chelates. But, by far the greatest effect arose from altering the position of the hydrophobic amide substituent, which, when forced upwards around the water binding site, caused a substantial reduction in the rate of water proton exchange. Such slow water proton exchange afforded a chelate that was 4.5 times more effective as a CEST agent than its isomeric counterparts in dry acetonitrile and at low temperatures and very low presaturation powers.
Collapse
Affiliation(s)
- Jacqueline R Slack
- Department of Chemistry, Portland State University, 1719 SW 10th Avenue, Portland, OR, 97201, USA
| | | |
Collapse
|
12
|
Mastropietro A, De Bernardi E, Breschi GL, Zucca I, Cametti M, Soffientini CD, de Curtis M, Terraneo G, Metrangolo P, Spreafico R, Resnati G, Baselli G. Optimization of rapid acquisition with relaxation enhancement (RARE) pulse sequence parameters for19F-MRI studies. J Magn Reson Imaging 2013; 40:162-70. [DOI: 10.1002/jmri.24347] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Affiliation(s)
- Alfonso Mastropietro
- Politecnico di Milano; Department of Electronics Information and Bioengineering; Milano Italy
- Scientific Direction Unit; Fondazione IRCCS Istituto Neurologico C. Besta; Milano Italy
- Politecnico di Milano, NFMLab Department of Chemistry; Materials and Chemical Engineering Giulio Natta; Milano Italy
| | - Elisabetta De Bernardi
- Politecnico di Milano; Department of Electronics Information and Bioengineering; Milano Italy
- Health Science Department; University of Milano-Bicocca; Monza Italy
- Tecnomed Foundation; University of Milano-Bicocca; Monza Italy
- Politecnico di Milano, NFMLab Department of Chemistry; Materials and Chemical Engineering Giulio Natta; Milano Italy
| | - Gian Luca Breschi
- Experimental Neurophysiology and Epileptology Unit; Fondazione IRCCS Istituto Neurologico C. Besta; Milano Italy
- Department of Neuroscience and Brain Technologies; Istituto Italiano di Tecnologia; Genova Italy
- Politecnico di Milano, NFMLab Department of Chemistry; Materials and Chemical Engineering Giulio Natta; Milano Italy
| | - Ileana Zucca
- Scientific Direction Unit; Fondazione IRCCS Istituto Neurologico C. Besta; Milano Italy
- Politecnico di Milano, NFMLab Department of Chemistry; Materials and Chemical Engineering Giulio Natta; Milano Italy
| | - Massimo Cametti
- Clinical Epileptology and Experimental Neurophysiology Unit; Fondazione IRCCS Istituto Neurologico C. Besta; Milano Italy
- Politecnico di Milano, NFMLab Department of Chemistry; Materials and Chemical Engineering Giulio Natta; Milano Italy
| | - Chiara Dolores Soffientini
- Politecnico di Milano; Department of Electronics Information and Bioengineering; Milano Italy
- Politecnico di Milano, NFMLab Department of Chemistry; Materials and Chemical Engineering Giulio Natta; Milano Italy
| | - Marco de Curtis
- Experimental Neurophysiology and Epileptology Unit; Fondazione IRCCS Istituto Neurologico C. Besta; Milano Italy
- Politecnico di Milano, NFMLab Department of Chemistry; Materials and Chemical Engineering Giulio Natta; Milano Italy
| | - Giancarlo Terraneo
- Clinical Epileptology and Experimental Neurophysiology Unit; Fondazione IRCCS Istituto Neurologico C. Besta; Milano Italy
- Politecnico di Milano, NFMLab Department of Chemistry; Materials and Chemical Engineering Giulio Natta; Milano Italy
| | - Pierangelo Metrangolo
- Clinical Epileptology and Experimental Neurophysiology Unit; Fondazione IRCCS Istituto Neurologico C. Besta; Milano Italy
- Politecnico di Milano, NFMLab Department of Chemistry; Materials and Chemical Engineering Giulio Natta; Milano Italy
| | - Roberto Spreafico
- Department of Neuroscience and Brain Technologies; Istituto Italiano di Tecnologia; Genova Italy
- Politecnico di Milano, NFMLab Department of Chemistry; Materials and Chemical Engineering Giulio Natta; Milano Italy
| | - Giuseppe Resnati
- Clinical Epileptology and Experimental Neurophysiology Unit; Fondazione IRCCS Istituto Neurologico C. Besta; Milano Italy
- Politecnico di Milano, NFMLab Department of Chemistry; Materials and Chemical Engineering Giulio Natta; Milano Italy
| | - Giuseppe Baselli
- Politecnico di Milano; Department of Electronics Information and Bioengineering; Milano Italy
- Politecnico di Milano, NFMLab Department of Chemistry; Materials and Chemical Engineering Giulio Natta; Milano Italy
| |
Collapse
|
13
|
Bonnet CS, Tóth É. Magnetic Resonance Imaging Contrast Agents. Supramol Chem 2012. [DOI: 10.1002/9780470661345.smc104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
14
|
von Elverfeldt D, Meißner M, Peter K, Paul D, Meixner F, Neudorfer I, Merkle A, Harloff A, Zirlik A, Schöllhorn J, Markl M, Hennig J, Bode C, von zur Muhlen C. An approach towards molecular imaging of activated platelets allows imaging of symptomatic human carotid plaques in a new model of a tissue flow chamber. CONTRAST MEDIA & MOLECULAR IMAGING 2012; 7:204-13. [DOI: 10.1002/cmmi.482] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
| | - Mirko Meißner
- Department of Radiology-Medical Physics; University Medical Center Freiburg; Germany
| | - Karlheinz Peter
- Atherothrombosis and Vascular Biology; Baker Heart Research Institute; Melbourne Australia
| | - Dominik Paul
- Department of Radiology-Medical Physics; University Medical Center Freiburg; Germany
| | - Fabian Meixner
- Department of Cardiology and Angiology; University Medical Center Freiburg; Germany
| | - Irene Neudorfer
- Department of Cardiology and Angiology; University Medical Center Freiburg; Germany
| | - Annette Merkle
- Department of Radiology-Medical Physics; University Medical Center Freiburg; Germany
| | - Andreas Harloff
- Department of Neurology and Neurophysiology; University Medical Center Freiburg; Germany
| | - Andreas Zirlik
- Department of Radiology-Medical Physics; University Medical Center Freiburg; Germany
| | - Joachim Schöllhorn
- Department of Cardiovascular Surgery; University Medical Center Freiburg; Germany
| | - Michael Markl
- Department of Radiology-Medical Physics; University Medical Center Freiburg; Germany
| | - Jürgen Hennig
- Department of Radiology-Medical Physics; University Medical Center Freiburg; Germany
| | - Christoph Bode
- Department of Cardiology and Angiology; University Medical Center Freiburg; Germany
| | | |
Collapse
|
15
|
Bonnet CS, Devocelle M, Gunnlaugsson T. Luminescent lanthanide-binding peptides: sensitising the excited states of Eu(iii) and Tb(iii) with a 1,8-naphthalimide-based antenna. Org Biomol Chem 2012; 10:126-33. [DOI: 10.1039/c1ob06567j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
16
|
Jagadish B, Brickert-Albrecht GL, Nichol GS, Mash EA, Raghunand N. On the Synthesis of 1,4,7-Tris(tert-butoxycarbonylmethyl)-1,4,7,10-tetraazacyclododecane. Tetrahedron Lett 2011; 52:2058-2061. [PMID: 21516221 DOI: 10.1016/j.tetlet.2010.10.074] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
1,4,7-Tris(tert-butoxycarbonylmethyl)-1,4,7,10-tetraazacyclododecane is widely used as an intermediate in the preparation of medically important DO3A and DOTA metal chelators. Despite its commercial availability and importance, the literature describing the preparation and properties of the free base is limited and sometimes unclear. We present herein an efficient synthesis of the hydrobromide salt of 1,4,7-tris(tert-butoxycarbonylmethyl)-1,4,7,10-tetraazacyclododecane, characterize this compound spectroscopically and by X-ray crystallographic analysis, describe its simple conversion to the corresponding free base, characterize this compound spectroscopically and by X-ray crystallographic analysis, and make observations on the reactivity of this interesting and useful compound.
Collapse
|
17
|
Tu C, Osborne EA, Louie AY. Activatable T₁ and T₂ magnetic resonance imaging contrast agents. Ann Biomed Eng 2011; 39:1335-48. [PMID: 21331662 PMCID: PMC3069332 DOI: 10.1007/s10439-011-0270-0] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2011] [Accepted: 02/04/2011] [Indexed: 12/25/2022]
Abstract
Magnetic resonance imaging (MRI) has become one of the most important diagnosis tools available in medicine. Typically MRI is not capable of sensing biochemical activities. However, recently emerged activatable MRI contrast agents (CAs), whose relaxivity is variable in response to a specific parameter change in the surrounding physiological microenvironment, potentially allow for MRI to indicate biological processes. Among the various factors influencing the relaxivity of a CA, the number of inner-sphere water molecules (q) directly coordinated to the metal center, the residence time of the coordinated water molecule (τ (m)), and the rotational correlation time representing the molecular tumbling time of a complex (τ (R)) contribute strongly to the relaxivity of an activatable CA. Tuning the ligand structure and properties has been the subject of intensive research for activatable MR CA designs. This review summarizes a variety of activatable MRI CAs sensitive to common variables in microenvironment in vivo, i.e., pH, luminescence, metal ions, redox, and enzymes, etc., with emphasis on the influence of ligand design on parameters q, τ (m), and τ (R).
Collapse
Affiliation(s)
- Chuqiao Tu
- Department of Biomedical Engineering, University of California, Davis, CA, 95616, USA
| | | | | |
Collapse
|
18
|
Frullano L, Catana C, Benner T, Sherry AD, Caravan P. Bimodal MR-PET agent for quantitative pH imaging. Angew Chem Int Ed Engl 2010; 49:2382-4. [PMID: 20191650 DOI: 10.1002/anie.201000075] [Citation(s) in RCA: 122] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Luca Frullano
- A. A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, 149 13th Street, Suite 2301, Charlestown, MA 02129, USA
| | | | | | | | | |
Collapse
|