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Cotin G, Blanco-Andujar C, Nguyen DV, Affolter C, Boutry S, Boos A, Ronot P, Uring-Lambert B, Choquet P, Zorn PE, Mertz D, Laurent S, Muller RN, Meyer F, Felder Flesch D, Begin-Colin S. Dendron based antifouling, MRI and magnetic hyperthermia properties of different shaped iron oxide nanoparticles. Nanotechnology 2019; 30:374002. [PMID: 31195384 DOI: 10.1088/1361-6528/ab2998] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Owing to the great potential of iron oxide nanoparticles (NPs) for nanomedicine, large efforts have been made to better control their magnetic properties, especially their magnetic anisotropy to provide NPs able to combine imaging by MRI and therapy by magnetic hyperthermia. In that context, the design of anisotropic NPs appears as a very promising and efficient strategy. Furthermore, their bioactive coating also remains a challenge as it should provide colloidal stability, biocompatibility, furtivity along with good water diffusion for MRI. By taking advantage of our controlled synthesis method of iron oxide NPs with different shapes (cubic, spherical, octopod and nanoplate), we demonstrate here that the dendron coating, shown previously to be very suitable for 10 nm sized iron oxide, also provided very good colloidal, MRI and antifouling properties to the anisotropic shaped NPs. These antifouling properties, demonstrated through several experiments and characterizations, are very promising to achieve specific targeting of disease tissues without affecting healthy organs. On the other hand, the magnetic hyperthermia properties were shown to depend on the saturation magnetization and the ability of NPs to self-align, confirming the need of a balance between crystalline and dipolar magnetic anisotropies.
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Affiliation(s)
- G Cotin
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67034 Strasbourg, France. Labex CSC, Fondation IcFRC/université de Strasbourg, 8 allée Gaspard Monge BP 70028, F-67083 Strasbourg Cedex, France
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2
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Diallo MST, Traore MS, Balde MA, Camara AK, Baldé ES, Traore S, Oulare K, Diallo TS, Laurent S, Muller RN, Tuenter E, Pieters L, Balde AM. Prevalence, management and ethnobotanical investigation of hypertension in two Guinean urban districts. J Ethnopharmacol 2019; 231:73-79. [PMID: 30056206 DOI: 10.1016/j.jep.2018.07.028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 07/04/2018] [Accepted: 07/25/2018] [Indexed: 06/08/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Hypertension is an important public health challenge in low- and middle-income countries, and in many African countries including Guinea medicinal plants are still widely used for its treatment. MATERIALS AND METHODS The objective of this study was to determine the prevalence of hypertension in two Guinean urban districts (Pounthioun and Dowsare), to describe its management and to collect information on traditional herbal remedies. A total of 316 participants entered the study, 28.2% (89/316) men and 71.8% (227/316) women. Of these, 181 were from Dowsare (50 men and 131 women) and 135 from Pounthioun (39 men and 96 women). The mean age of subjects was 40.8 ± 14.0 years (range18 - 88years), while the majority of subjects (63.3% or 200/316) were 45-74 years old. RESULTS The overall prevalence of hypertension was 44.9% (142/316): 46.4% (84/181) from Dowsare and 43.0% (58/135) from Pounthioun. Ethnobotanical investigations among hypertensive patients led to the collection of 15 plant species, among which Hymenocardia acida leaves and Uapaca togoensis stem bark were the most cited. Phytochemical investigation of these two plant species led to the isolation and identification of isovitexin and isoorientin from H. acida, and betulinic acid and lupeol from U. togoensis. CONCLUSION The presence of these constituents in Hymenocardia acida leaves and Uapaca togoensis stem bark may at least in part support their traditional use against hypertension in Guinea.
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Affiliation(s)
- M S T Diallo
- Department of Pharmacy, University Gamal Abdel Nasser of Conakry, BP 1017, Guinea; Research and Valorization Center on Medicinal Plants Dubreka, BP 6411 Conakry, Guinea; Service de Chimie Générale, Organique et Biomédicale; Laboratoire de RMN et d'Imagerie Moléculaire, Université de Mons, Belgium
| | - M S Traore
- Department of Pharmacy, University Gamal Abdel Nasser of Conakry, BP 1017, Guinea; Research and Valorization Center on Medicinal Plants Dubreka, BP 6411 Conakry, Guinea
| | - M A Balde
- Department of Pharmacy, University Gamal Abdel Nasser of Conakry, BP 1017, Guinea; Research and Valorization Center on Medicinal Plants Dubreka, BP 6411 Conakry, Guinea
| | - A K Camara
- Department of Pharmacy, University Gamal Abdel Nasser of Conakry, BP 1017, Guinea
| | - E S Baldé
- Department of Pharmacy, University Gamal Abdel Nasser of Conakry, BP 1017, Guinea; Research and Valorization Center on Medicinal Plants Dubreka, BP 6411 Conakry, Guinea
| | - S Traore
- Research and Valorization Center on Medicinal Plants Dubreka, BP 6411 Conakry, Guinea
| | - K Oulare
- Research and Valorization Center on Medicinal Plants Dubreka, BP 6411 Conakry, Guinea
| | - T S Diallo
- Research and Valorization Center on Medicinal Plants Dubreka, BP 6411 Conakry, Guinea
| | - S Laurent
- Service de Chimie Générale, Organique et Biomédicale; Laboratoire de RMN et d'Imagerie Moléculaire, Université de Mons, Belgium
| | - R N Muller
- Service de Chimie Générale, Organique et Biomédicale; Laboratoire de RMN et d'Imagerie Moléculaire, Université de Mons, Belgium
| | - E Tuenter
- Natural Products & Food Research and Analysis (NatuRA), Department of Pharmaceutical Sciences, University of Antwerp, Belgium
| | - L Pieters
- Natural Products & Food Research and Analysis (NatuRA), Department of Pharmaceutical Sciences, University of Antwerp, Belgium
| | - A M Balde
- Department of Pharmacy, University Gamal Abdel Nasser of Conakry, BP 1017, Guinea; Research and Valorization Center on Medicinal Plants Dubreka, BP 6411 Conakry, Guinea.
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Roch A, Prodéo J, Pierart C, Muller RN, Duez P. The paramagnetic properties of malaria pigment, hemozoin, yield clues to a low-cost system for its trapping and determination. Talanta 2019; 197:553-557. [PMID: 30771975 DOI: 10.1016/j.talanta.2019.01.090] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 01/22/2019] [Accepted: 01/24/2019] [Indexed: 11/27/2022]
Abstract
The binding of malaria pigment, hemozoin, by a gradient magnetic field has been investigated in a manual trapping column system. Two types of magnetic filling have been tested to produce field gradients: nickel-plated steel wires, wrapped around a steel core, and superparamagnetic microbeads. The latter system allows an efficient trapping (> 80%) of β-hematin (a synthetic pigment with physical and paramagnetic properties analogous to those of hemozoin). Tests with a Plasmodium falciparum 3D7 culture indicate that hemozoin is similarly trapped. Off-line optical spectroscopy measurements present limited sensitivity as the hemozoin we detected from in vitro cultured parasites would correspond to only a theoretical 0.02% parasitemia (1000 parasites/µL). Further work needs to be undertaken to reduce this threshold to a practical detectability level. Based on these data, a magneto-chromatographic on-line system with reduced dead volumes is proposed as a possible low-cost instrument to be tested as a malaria diagnosis system.
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Affiliation(s)
- A Roch
- Service de Chimie Générale, Organique et Biomédicale, Université de Mons (UMONS), Bât. Mendeleïev, Avenue Maistriau 19, 7000 Mons, Belgium
| | - J Prodéo
- Service de Chimie Générale, Organique et Biomédicale, Université de Mons (UMONS), Bât. Mendeleïev, Avenue Maistriau 19, 7000 Mons, Belgium
| | - C Pierart
- Service de Chimie Générale, Organique et Biomédicale, Université de Mons (UMONS), Bât. Mendeleïev, Avenue Maistriau 19, 7000 Mons, Belgium
| | - R N Muller
- Service de Chimie Générale, Organique et Biomédicale, Université de Mons (UMONS), Bât. Mendeleïev, Avenue Maistriau 19, 7000 Mons, Belgium
| | - P Duez
- Service de Chimie Thérapeutique et de Pharmacognosie, Université de Mons (UMONS), Bât. 6, Chemin du Champ de Mars 25, 7000 Mons, Belgium.
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4
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Vangijzegem T, Stanicki D, Boutry S, Paternoster Q, Vander Elst L, Muller RN, Laurent S. VSION as high field MRI T 1 contrast agent: evidence of their potential as positive contrast agent for magnetic resonance angiography. Nanotechnology 2018; 29:265103. [PMID: 29620535 DOI: 10.1088/1361-6528/aabbd0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Because of their outstanding magnetic properties, iron oxide nanoparticles have already been the subject of numerous studies in the biomedical field, in particular as a negative contrast agent for T2-weighted nuclear magnetic resonance imaging, or as therapeutic agents in hyperthermia experiments. Recent studies have shown that below a given particle size (i.e. 5 nm), iron oxide may be used to provide a significant positive (brightening) effect on T1-weighted MRI. In such an application, not only the size of the crystal, but also the control of the coating process is essential to ensure optimal properties, especially at a very high field (> 3 T). In this work, we focused on the development of very small iron oxide nanoparticles as a potential platform for high field T1 magnetic resonance angiography (MRA) applications. The feasibility has been evaluated in vivo at 9.4 T, demonstrating the usefulness of the developed system for MRA applications.
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Affiliation(s)
- T Vangijzegem
- Department of General, Organic and Biomedical Chemistry, NMR and Molecular Imaging Laboratory, University of Mons, B-7000 Mons, Belgium
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5
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Bordeianu C, Parat A, Piant S, Walter A, Zbaraszczuk-Affolter C, Meyer F, Begin-Colin S, Boutry S, Muller RN, Jouberton E, Chezal JM, Labeille B, Cinotti E, Perrot JL, Miot-Noirault E, Laurent S, Felder-Flesch D. Evaluation of the Active Targeting of Melanin Granules after Intravenous Injection of Dendronized Nanoparticles. Mol Pharm 2018; 15:536-547. [PMID: 29298480 DOI: 10.1021/acs.molpharmaceut.7b00904] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The biodistribution of dendronized iron oxides, NPs10@D1_DOTAGA and melanin-targeting NPs10@D1_ICF_DOTAGA, was studied in vivo using magnetic resonance imaging (MRI) and planar scintigraphy through [177Lu]Lu-radiolabeling. MRI experiments showed high contrast power of both dendronized nanoparticles (DPs) and hepatobiliary and urinary excretions. Little tumor uptake could be highlighted after intravenous injection probably as a consequence of the negatively charged DOTAGA-derivatized shell, which reduces the diffusion across the cells' membrane. Planar scintigraphy images demonstrated a moderate specific tumor uptake of melanoma-targeted [177Lu]Lu-NPs10@D1_ICF_DOTAGA at 2 h post-intravenous injection (pi), and the highest tumor uptake of the control probe [177Lu]Lu-NPs10@D1_DOTAGA at 30 min pi, probably due to the enhanced permeability and retention effect. In addition, ex vivo confocal microscopy studies showed a high specific targeting of human melanoma samples impregnated with NPs10@D1_ICF_Alexa647_ DOTAGA.
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Affiliation(s)
- C Bordeianu
- Université de Strasbourg , CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France.,Fondation IcFRC/Université de Strasbourg , 8 allée Gaspard Monge BP 70028, F-67083 Strasbourg Cedex, France
| | - A Parat
- Université de Strasbourg , CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France.,Fondation IcFRC/Université de Strasbourg , 8 allée Gaspard Monge BP 70028, F-67083 Strasbourg Cedex, France
| | - S Piant
- Université de Strasbourg , CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France.,Fondation IcFRC/Université de Strasbourg , 8 allée Gaspard Monge BP 70028, F-67083 Strasbourg Cedex, France
| | - A Walter
- Université de Strasbourg , CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France.,Fondation IcFRC/Université de Strasbourg , 8 allée Gaspard Monge BP 70028, F-67083 Strasbourg Cedex, France
| | - C Zbaraszczuk-Affolter
- Université de Strasbourg , INSERM, UMR 1121 Biomatériaux et Bioingénierie, 11 rue Humann F-67000 Strasbourg, France
| | - F Meyer
- Université de Strasbourg , INSERM, UMR 1121 Biomatériaux et Bioingénierie, 11 rue Humann F-67000 Strasbourg, France
| | - S Begin-Colin
- Université de Strasbourg , CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France.,Fondation IcFRC/Université de Strasbourg , 8 allée Gaspard Monge BP 70028, F-67083 Strasbourg Cedex, France
| | - S Boutry
- University of Mons , General, Organic and Biomedical Chemistry NMR and Molecular Imaging Laboratory, Avenue Maistriau 19, 7000 Mons, Belgium.,CMMI - Center for Microscopy and Molecular Imaging, MRI & Optical Imaging , Rue Adrienne Bolland 8, 6041 Gosselies, Belgium
| | - R N Muller
- University of Mons , General, Organic and Biomedical Chemistry NMR and Molecular Imaging Laboratory, Avenue Maistriau 19, 7000 Mons, Belgium.,CMMI - Center for Microscopy and Molecular Imaging, MRI & Optical Imaging , Rue Adrienne Bolland 8, 6041 Gosselies, Belgium
| | - E Jouberton
- Clermont Université, Université d'Auvergne , Laboratoire d'Imagerie Moléculaire et Thérapie Vectorisée, BP 10448, F-63000 Clermont-Ferrand, France.,INSERM, U1240 , F-63005 Clermont-Ferrand, France
| | - J-M Chezal
- Clermont Université, Université d'Auvergne , Laboratoire d'Imagerie Moléculaire et Thérapie Vectorisée, BP 10448, F-63000 Clermont-Ferrand, France.,INSERM, U1240 , F-63005 Clermont-Ferrand, France
| | - B Labeille
- CHU , Département de Dermatologie, F-42000 St. Etienne, France
| | - E Cinotti
- Department of Medical, Surgical and Neurological Science, Dermatology Section, University of Siena , S. Maria alle Scotte Hospital, F-53100 Siena, Italy
| | - J-L Perrot
- CHU , Département de Dermatologie, F-42000 St. Etienne, France
| | - E Miot-Noirault
- Clermont Université, Université d'Auvergne , Laboratoire d'Imagerie Moléculaire et Thérapie Vectorisée, BP 10448, F-63000 Clermont-Ferrand, France.,INSERM, U1240 , F-63005 Clermont-Ferrand, France
| | - S Laurent
- University of Mons , General, Organic and Biomedical Chemistry NMR and Molecular Imaging Laboratory, Avenue Maistriau 19, 7000 Mons, Belgium.,CMMI - Center for Microscopy and Molecular Imaging, MRI & Optical Imaging , Rue Adrienne Bolland 8, 6041 Gosselies, Belgium
| | - D Felder-Flesch
- Université de Strasbourg , CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France.,Fondation IcFRC/Université de Strasbourg , 8 allée Gaspard Monge BP 70028, F-67083 Strasbourg Cedex, France
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6
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Rigaux G, Gheran CV, Callewaert M, Cadiou C, Voicu SN, Dinischiotu A, Andry MC, Vander Elst L, Laurent S, Muller RN, Berquand A, Molinari M, Huclier-Markai S, Chuburu F. Characterization of Gd loaded chitosan-TPP nanohydrogels by a multi-technique approach combining dynamic light scattering (DLS), asymetrical flow-field-flow-fractionation (AF4) and atomic force microscopy (AFM) and design of positive contrast agents for molecular resonance imaging (MRI). Nanotechnology 2017; 28:055705. [PMID: 28029111 DOI: 10.1088/1361-6528/aa5188] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Chitosan CS-tripolyphosphate TPP/hyaluronic acid HA nanohydrogels loaded with gadolinium chelates (GdDOTA ⊂ CS-TPP/HA NGs) synthesized by ionic gelation were designed for lymph node (LN) MRI. In order to be efficiently drained to LNs, nanogels (NGs) needed to exhibit a diameter ϕ < 100 nm. For that, formulation parameters were tuned, using (i) CS of two different molecular weights (51 and 37 kDa) and (ii) variable CS/TPP ratio (2 < CS/TPP < 8). Characterization of NG size distribution by dynamic light scattering (DLS) and asymetrical flow-field-flow-fractionation (AF4) showed discrepancies since DLS diameters were consistently above 200 nm while AF4 showed individual nano-objects with ϕ < 100 nm. Such a difference could be correlated to the presence of aggregates inherent to ionic gelation. This point was clarified by atomic force microscopy (AFM) in liquid mode which highlighted the main presence of individual nano-objects in nanosuspensions. Thus, combination of DLS, AF4 and AFM provided a more precise characterization of GdDOTA ⊂ CS-TPP/HA nanohydrogels which, in turn, allowed to select formulations leading to NGs of suitable mean sizes showing good MRI efficiency and negligible toxicity.
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Affiliation(s)
- G Rigaux
- Institut de Chimie Moléculaire de Reims, CNRS UMR 7312, Université de Reims Champagne-Ardenne URCA, F-51685 Reims Cedex 2, France
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7
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Ghouila Z, Laurent S, Boutry S, Vander Elst L, Nateche F, Muller RN, Baaliouamer A. Antioxidant, antibacterial and cell toxicity effects of polyphenols Fromahmeur bouamer grape seed extracts. J Fundam and Appl Sci 2017. [DOI: 10.4314/jfas.v9i1.24] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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8
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Bordeianu C, Parat A, Affolter-Zbaraszczuk C, Muller RN, Boutry S, Begin-Colin S, Meyer F, Laurent S, Felder-Flesch D. How a grafting anchor tailors the cellular uptake and in vivo fate of dendronized iron oxide nanoparticles. J Mater Chem B 2017; 5:5152-5164. [DOI: 10.1039/c7tb00781g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Superparamagnetic iron oxide nanoparticles synthesized by thermal decomposition have been grafted with two dendrons bearing respectively a monophosphonic anchor (D2) or a biphosphonic tweezer (D2-2P) at their focal point.
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Affiliation(s)
- C. Bordeianu
- Université de Strasbourg
- CNRS
- Institut de Physique et Chimie des Matériaux de Strasbourg
- F-67000 Strasbourg
- France
| | - A. Parat
- Université de Strasbourg
- CNRS
- Institut de Physique et Chimie des Matériaux de Strasbourg
- F-67000 Strasbourg
- France
| | | | - R. N. Muller
- University of Mons
- General
- Organic and Biomedical Chemistry NMR and Molecular Imaging Laboratory
- 7000 Mons
- Belgium
| | - S. Boutry
- University of Mons
- General
- Organic and Biomedical Chemistry NMR and Molecular Imaging Laboratory
- 7000 Mons
- Belgium
| | - S. Begin-Colin
- Université de Strasbourg
- CNRS
- Institut de Physique et Chimie des Matériaux de Strasbourg
- F-67000 Strasbourg
- France
| | - F. Meyer
- Université de Strasbourg
- INSERM
- UMR 1121 Biomatériaux et Bioingénierie
- 67000 Strasbourg
- France
| | - S. Laurent
- University of Mons
- General
- Organic and Biomedical Chemistry NMR and Molecular Imaging Laboratory
- 7000 Mons
- Belgium
| | - D. Felder-Flesch
- Université de Strasbourg
- CNRS
- Institut de Physique et Chimie des Matériaux de Strasbourg
- F-67000 Strasbourg
- France
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9
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Blomme A, Costanza B, de Tullio P, Thiry M, Van Simaeys G, Boutry S, Doumont G, Di Valentin E, Hirano T, Yokobori T, Gofflot S, Peulen O, Bellahcène A, Sherer F, Le Goff C, Cavalier E, Mouithys-Mickalad A, Jouret F, Cusumano PG, Lifrange E, Muller RN, Goldman S, Delvenne P, De Pauw E, Nishiyama M, Castronovo V, Turtoi A. Myoferlin regulates cellular lipid metabolism and promotes metastases in triple-negative breast cancer. Oncogene 2016; 36:2116-2130. [DOI: 10.1038/onc.2016.369] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 07/30/2016] [Accepted: 08/28/2016] [Indexed: 02/07/2023]
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10
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Walter A, Garofalo A, Parat A, Jouhannaud J, Pourroy G, Voirin E, Laurent S, Bonazza P, Taleb J, Billotey C, Vander Elst L, Muller RN, Begin-Colin S, Felder-Flesch D. Validation of a dendron concept to tune colloidal stability, MRI relaxivity and bioelimination of functional nanoparticles. J Mater Chem B 2015; 3:1484-1494. [DOI: 10.1039/c4tb01954g] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A dendritic coating induces colloidal stability of nanoparticles through electrostatic and steric interactions.
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Zhou Q, Henoumont C, Vander Elst L, Laurent S, Muller RN. Fluorometry, a fast screening technique for non-covalent binding of contrast agents to human serum albumin? Contrast Media Mol Imaging 2013; 8:361-5. [DOI: 10.1002/cmmi.1531] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2012] [Revised: 12/09/2012] [Accepted: 01/04/2013] [Indexed: 11/09/2022]
Affiliation(s)
| | - C. Henoumont
- Department of General, Organic and Biomedical Chemistry, NMR and Molecular Imaging Laboratory; University of Mons; Mons; Belgium
| | - L. Vander Elst
- Department of General, Organic and Biomedical Chemistry, NMR and Molecular Imaging Laboratory; University of Mons; Mons; Belgium
| | - S. Laurent
- Department of General, Organic and Biomedical Chemistry, NMR and Molecular Imaging Laboratory; University of Mons; Mons; Belgium
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12
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Danhier P, De Preter G, Boutry S, Mahieu I, Leveque P, Magat J, Haufroid V, Sonveaux P, Bouzin C, Feron O, Muller RN, Jordan BF, Gallez B. Electron paramagnetic resonance as a sensitive tool to assess the iron oxide content in cells for MRI cell labeling studies. Contrast Media Mol Imaging 2012; 7:302-7. [PMID: 22539400 DOI: 10.1002/cmmi.497] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
MRI cell tracking is a promising technique to track various cell types (stem cells, tumor cells, etc.) in living animals. Usually, cells are incubated with iron oxides (T(2) contrast agent) in order to take up the particles before being injected in vivo. Iron oxide quantification is important in such studies for validating the labeling protocols and assessing the dilution of the particles with cell proliferation. We here propose to implement electron paramagnetic resonance (EPR) as a very sensitive method to quantify iron oxide concentration in cells. Iron oxide particles exhibit a unique EPR spectrum, which directly reflects the number of particles in a sample. In order to compare EPR with existing methods (Perls's Prussian blue reaction, ICP-MS and fluorimetry), we labeled tumor cells (melanoma and renal adenocarcinoma cell lines) and fibroblasts with fluorescent iron oxide particles, and determined the limits of detection of the different techniques. We show that EPR is a very sensitive technique and is specific for iron oxide quantification as measurements are not affected by endogenous iron. As a consequence, EPR is well adapted to perform ex vivo analysis of tissues after cell tracking experiments in order to confirm MRI results.
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Affiliation(s)
- P Danhier
- Louvain Drug Research Institute, Biomedical Magnetic Resonance Research Group, Université Catholique de Louvain, Brussels, Belgium
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13
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Radermacher KA, Magat J, Bouzin C, Laurent S, Dresselaers T, Himmelreich U, Boutry S, Mahieu I, Vander Elst L, Feron O, Muller RN, Jordan BF, Gallez B. Multimodal assessment of early tumor response to chemotherapy: comparison between diffusion-weighted MRI, 1H-MR spectroscopy of choline and USPIO particles targeted at cell death. NMR Biomed 2012; 25:514-522. [PMID: 21874657 DOI: 10.1002/nbm.1765] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2010] [Revised: 05/20/2011] [Accepted: 05/20/2011] [Indexed: 05/31/2023]
Abstract
The aim of this study was to determine the value of different magnetic resonance (MR) protocols to assess early tumor response to chemotherapy. We used a murine tumor model (TLT) presenting different degrees of response to three different cytotoxic agents. As shown in survival curves, cyclophosphamide (CP) was the most efficient drug followed by 5-fluorouracil (5-FU), whereas the etoposide treatment had little impact on TLT tumors. Three different MR protocols were used at 9.4 Tesla 24 h post-treatment: diffusion-weighted (DW)-MRI, choline measurement by (1) H MRS, and contrast-enhanced MRI using ultrasmall iron oxide nanoparticles (USPIO) targeted at phosphatidylserine. Accumulation of contrast agent in apoptotic tumors was monitored by T(2) -weighted images and quantified by EPR spectroscopy. Necrosis and apoptosis were assessed by histology. Large variations were observed in the measurement of choline peak areas and could not be directly correlated to tumor response. Although the targeted USPIO particles were able to significantly differentiate between the efficiency of each cytotoxic agent and best correlated with survival endpoint, they present the main disadvantage of non-specific tumor accumulation, which could be problematic when transferring the method to the clinic. DW-MRI presents a better compromise by combining longitudinal studies with a high dynamic range; however, DW-MRI was unable to show any significant effect for 5-FU. This study illustrates the need for multimodal imaging in assessing tumor response to treatment to compensate for individual limitations.
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Affiliation(s)
- K A Radermacher
- Louvain Drug Research Institute, Université Catholique de Louvain, Brussels, Belgium
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Maquestiau A, van Haverbeke Y, Muller RN. Equilibre Prototropique des Aryl- et Alkylisoxazoline-5-Ones. Influence de la Basicité des Milieux Aprotiques. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19740830708] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Elguero J, Muller RN, Blade-Font A, Faure R, Vincent EJ. Carbon-13 Magnetic Resonance Spectroscopy. A Study Of Colchicine And Related Compounds. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19800890307] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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van Haverbeke Y, Maquestiau A, Muller RN, Vanden Eynde JJ, Zeegers-Huyskens T, Rulinda JB, Leroy G, Louterman-Leloup G. Etude Structurale de 2-Phenyl-4-[1′-Heteroalkylidene]Oxazoline-5-Ones. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19750840806] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Laurent S, Vander Elst L, Henoumont C, Muller RN. How to measure the transmetallation of a gadolinium complex. Contrast Media Mol Imaging 2010; 5:305-8. [DOI: 10.1002/cmmi.388] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Henoumont C, Vander Elst L, Laurent S, Muller RN. Synthesis and physicochemical characterization of Gd-C4-thyroxin-DTPA, a potential MRI contrast agent. Evaluation of its affinity for human serum albumin by proton relaxometry, NMR diffusometry, and electrospray mass spectrometry. J Phys Chem B 2010; 114:3689-97. [PMID: 20175550 DOI: 10.1021/jp910961j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Gd-C(4)-thyroxin-DTPA, a potential MRI contrast agent, was synthesized from Gd-DTPA and thyroxine, which interacts strongly with human serum albumin (HSA). It was characterized in water by its relaxometric properties and its stability versus zinc transmetalation. The affinity of the complex for HSA was studied by using three different methods: proton relaxometry, NMR diffusometry, and electrospray mass spectrometry. From the results, it appears that Gd-C(4)-thyroxin-DTPA exhibits a relatively high relaxivity (r(1) = 9.01 s(-1) mM(-1) at 1.5 T and 310 K), a good stability versus zinc transmetalation, and a strong interaction with HSA (K(a) approximately 10,000 M(-1) with two binding sites). The kinetics of the exchange between the bound and the free form of the complex was evaluated by the NMR diffusometry technique. Competition experiments have allowed the assignment of the chelate's binding site on HSA.
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Affiliation(s)
- C Henoumont
- Department of General, Organic and Biomedical Chemistry, NMR and Molecular Imaging Laboratory, University of Mons, 19 avenue Maistriau, B-7000 Mons, Belgium
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Laurent S, Boutry S, Mahieu I, Vander Elst L, Muller RN. Iron oxide based MR contrast agents: from chemistry to cell labeling. Curr Med Chem 2010; 16:4712-27. [PMID: 19903138 DOI: 10.2174/092986709789878256] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2009] [Accepted: 11/25/2009] [Indexed: 11/22/2022]
Abstract
Superparamagnetic iron oxide nanoparticles can be used for numerous applications such as MRI contrast enhancement, hyperthermia, detoxification of biological fluids, drug delivery, or cell separation. In this work, we will summarize the chemical routes for synthesis of iron oxide nanoparticles, the fluid stabilization, and the surface modification of superparamagnetic iron oxide nanoparticles. Some examples of the numerous applications of these particles in the biomedical field mainly as MRI negative contrast agents for tissue-specific imaging, cellular labeling, and molecular imaging will be given. Larger particles or particles displaying a non-neutral surface (thanks to their coating or to a cell transfection agent with which they are mixed) are very useful tools, although the cells to be labeled have no professional phagocytic function. Labeled cells can then be transplanted and monitored by MRI in a broad spectrum of applications. Direct in vivo magnetic labeling of cells is mainly performed by intravenous injection of long-circulating iron oxide-based MRI contrast agents, which can extravasate and/or undergo a cellular uptake in an amount sufficient to allow an MRI visualization of areas of interest such as inflamed regions or tumors. Particles with long circulation times, or able to induce a strong negative effect individually have been also modified by conjugation to a ligand, so that their cellular uptake, or at least their binding to the cell surface, could occur through a specific ligand-receptor interaction, in vivo as well as in vitro. Thus, experimentally as well as in a few trials on humans, iron oxide particles currently find promising applications.
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Affiliation(s)
- S Laurent
- Department of General, Organic and Biomedical Chemistry, NMR and Molecular Imaging Laboratory, University of Mons, B-7000 Mons, Belgium.
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Laurent S, Vander Elst L, Muller RN. Lanthanide complexes for magnetic resonance and optical molecular imaging. Q J Nucl Med Mol Imaging 2009; 53:586-603. [PMID: 20016451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Lanthanide complexes are more and more used in biomedical imaging as contrast agents (CA). The development of these paramagnetic complexes as CA for medical magnetic resonance imaging (MRI) and luminescent probes for optical imaging is very complementary. Gd complexes are well known as CA for MRI and Eu/Tb complexes are often used in microscopy or fluorescence imaging. Each imaging technique has its limitation: low sensitivity but high spatial resolution for MRI and limited penetration but high sensitivity for optical imaging. A bimodal agent can be used for these two methods and give more informations, they can be visualized simultaneously by light and MR imaging. Such compounds are based on the coordination chemistry of the lanthanide ions with an organic ligand to form a stable complex and on the properties of the lanthanide ions. Gd complexes with a chromophore allows also the luminescent detection. This review describes the properties of the lanthanide ions and of their complexes and gives some typical applications of the complexes. The luminescence properties show high quantum yield and long luminescence lifetimes. The relaxometric data of the Gd complexes are comparable or higher than commercial and clinically Gd-DTPA derivatives.
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Affiliation(s)
- S Laurent
- Department of General Organic and Biomedical Chemistry Laboratory of NMR and Molecular Imaging, University of Mons, Mons, Belgium
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Muller RN. CMR2009: Harry Fischer Award Session: MRI contrast agents, where do we come from, where are we going to? Contrast Media Mol Imaging 2009. [DOI: 10.1002/cmmi.319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Laurent S, Vander Elst L, Henrotte V, Muller RN. CMR2009: 5.08: StructureâHSA affinity relationship of some new Gd-DTPA derivatives. Contrast Media Mol Imaging 2009. [DOI: 10.1002/cmmi.327] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Laurent S, Vander Elst L, Botteman F, Muller RN. CMR 2007: 8.01: A comprehensive study of the charge–water exchange rate relationship in a series of Gd-DTPA derivatives, potential MRI contrast agents. Contrast Media Mol Imaging 2007. [DOI: 10.1002/cmmi.193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Laurent S, Vander Elst L, Wautier M, Galaup C, Muller RN, Picard C. In vitro characterization of the Gd complex of [2,6-pyridinediylbis(methylene nitrilo)] tetraacetic acid (PMN-tetraacetic acid) and of its Eu analogue, suitable bimodal contrast agents for MRI and optical imaging. Bioorg Med Chem Lett 2007; 17:6230-3. [PMID: 17889530 DOI: 10.1016/j.bmcl.2007.09.027] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2007] [Revised: 08/31/2007] [Accepted: 09/05/2007] [Indexed: 10/22/2022]
Abstract
Gd and Eu complexes of PMN-tetraacetic acid show interesting properties either for MRI or for optical imaging; that is, for the Gd-complex, a high proton relaxivity with favorable water residence time; for the Eu-complex, a luminescence lifetime of 400 micros at room temperature compatible with the use of time-resolved luminescence technique. Both complexes have a good stability in physiological medium.
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Affiliation(s)
- S Laurent
- NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons-Hainaut, B-7000 Mons, Belgium.
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Laurent S, Vander Elst L, Wautier M, Picard C, Muller RN. CMR 2007: 8.02:In vitro characterization of a new Gd complex and its Eu analog, suitable bimodal contrast agents for MRI and optical imaging. Contrast Media Mol Imaging 2007. [DOI: 10.1002/cmmi.194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Miguel OB, Gossuin Y, Morales MP, Gillis P, Muller RN, Veintemillas-Verdaguer S. Comparative analysis of the 1H NMR relaxation enhancement produced by iron oxide and core-shell iron-iron oxide nanoparticles. Magn Reson Imaging 2007; 25:1437-41. [PMID: 17566686 DOI: 10.1016/j.mri.2007.04.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2006] [Revised: 04/04/2007] [Accepted: 04/13/2007] [Indexed: 10/23/2022]
Abstract
Physicochemical and magnetorelaxometric characterization of the colloidal suspensions consisting of Fe-based nanoparticles coated with dextran have been carried out. Iron oxide and iron core/iron oxide shell nanoparticles were obtained by laser-induced pyrolysis of Fe(CO)5 vapours. Under different magnetic field strengths, the colloidal suspension formed by iron oxide nanoparticles showed longitudinal (R1) and transverse (R2) nuclear magnetic relaxation suspension (NMRD) profiles, similar to those previously reported for other commercial magnetic resonance imaging (MRI) contrast agents. However, colloidal suspension formed by ferromagnetic iron-core nanoparticles showed a strong increase of the R1 values at low applied magnetic fields and a strong increase of the R2 measured at high applied magnetic field. This behaviour was explained considering the larger magnetic aggregate size and saturation magnetization values measured for this sample, 92 nm and 31 emu/g Fe, respectively, with respect to those measured for the colloidal suspensions of iron oxide nanoparticles (61 nm and 23 emu/g Fe). This suspension can be used both as T1 and T2 contrast agent.
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Affiliation(s)
- O Bomatí Miguel
- Department of Particulate Materials, Instituto de Ciencia de Materiales de Madrid, Cantoblanco, E 28049 Madrid, Spain
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Yu G, Yamashita M, Aoshima K, Takahashi M, Oshikawa T, Takayanagi H, Laurent S, Burtea C, Vander Elst L, Muller RN. A glycosylated complex of gadolinium, a new potential contrast agent for magnetic resonance angiography? Bioorg Med Chem Lett 2007; 17:2246-9. [PMID: 17303417 DOI: 10.1016/j.bmcl.2007.01.067] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2006] [Revised: 01/19/2007] [Accepted: 01/19/2007] [Indexed: 10/23/2022]
Abstract
A new low-molecular weight dendrimer-like MRI contrast agent (Gd-D1) has been synthesized and characterized in vitro by proton and oxygen-17 relaxometry. Its pharmacokinetic parameters and biodistribution patterns were evaluated on rats. Its in vitro and in vivo properties, that is, the longitudinal relaxivity (defined as the increase of the water proton longitudinal relaxation rate induced by one millimole per liter of Gd-D1) equal to 5.6s(-1)mM(-1) at 20 MHz and 310 K, the elimination half-time equal to 85 min, and its low accumulation in liver and spleen, underline its potential as a blood-pool MRI contrast agent.
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Affiliation(s)
- G Yu
- Department of Nano-Materials, Graduate School of Science and Technology, Shizuoka University, Hamamatsu 432-8561, Japan
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Segers J, Laumonier C, Laurent S, Elst LV, Muller RN. CMR 2005: 12.04: Stealthy magnetophages, a new tool for molecular imaging. Contrast Media Mol Imaging 2006. [DOI: 10.1002/cmmi.69] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Pereira GA, Ananias D, Rocha J, Amaral VS, Muller RN, Elst LV, Tóth É, Peters JA, Geraldes CFGC. NMR relaxivity of Ln3+-based zeolite-type materials. ACTA ACUST UNITED AC 2005. [DOI: 10.1039/b504082e] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Laurent S, Botteman F, Vander Elst L, Muller RN. Optimising the design of paramagnetic MRI contrast agents: influence of backbone substitution on the water exchange rate of Gd-DTPA derivatives. Magn Reson Mater Phy 2004; 16:235-45. [PMID: 15029509 DOI: 10.1007/s10334-004-0031-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2003] [Accepted: 12/19/2003] [Indexed: 10/26/2022]
Abstract
Among other factors influencing the residence time of the coordinated water (tauM) of paramagnetic contrast agents, the steric hindrance around the gadolinium ion seems to play a beneficial role. Such a crowding can be achieved by substituting the Gd-DTPA backbone on the C4 position. Several Gd-DTPA complexes carrying diverse groups at this position have thus been synthesised and characterised: GdS-C4-Me-DTPA, GdS-C4-n-Bu-DTPA, GdS-C4-iBu-DTPA, GdS-C4-iPr-DTPA, and Gd-C4-diMe-DTPA. TauM has been measured through the evolution of the water oxygen-17 transverse relaxation rate as a function of the temperature. The data show a reduction of tauM of GdS-C4-Me-DTPA, GdS-C4-n-Bu-DTPA, GdS-C4-iBu-DTPA, GdS-C4-iPr-DTPA, and Gd-C4-diMe-DTPA (tauM310 = 91,82, 108,98, and 57 ns respectively, as compared to Gd-DTPA (tauM310 = 143 ns)). At 310 K, the nuclear magnetic dispersion relaxation profiles of water protons are very similar for the five complexes which present longitudinal relaxivities slightly higher than those of Gd-DTPA. Regarding zinc transmetallation, C4-monosubstituted derivatives are more stable than Gd-DTPA. These results confirm that a judicious substitution of the DTPA skeleton allows for an acceleration of the coordinated water exchange rate. This observation can be useful for the design of vectorised contrast agents for molecular imaging.
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Affiliation(s)
- S Laurent
- NMR Laboratory, Department of Organic Chemistry, University of Mons-Hainaut, 7000 Mons, Belgium
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Vander Elst L, Zhang S, Sherry AD, Laurent S, Botteman F, Muller RN. Dy-complexes as high field T2 contrast agents: influence of water exchange rates. Acad Radiol 2002; 9 Suppl 2:S297-9. [PMID: 12188253 DOI: 10.1016/s1076-6332(03)80208-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Dy complexes can act as suitable negative (T2) contrast agents for Magnetic Resonance Imaging (MRI). As clinical MRI moves toward higher fields, tuning of the exchange rate of coordinated water molecules will become necessary to optimize the r2 relaxivity. For Dy complexes, this will require lengthening of the water residence time, a strategy opposite that required to optimize the r1 relaxivity of Gd complexes. However, very slow water exchange can be deleterious. This is illustrated here by a Dy complex that is characterized by a very slow water exchange. This complex, Dy-DOTA-4AmCE, is compared with several Dy-DTPA derivatives known for their efficacy as T2 contrast agents at high magnetic fields.
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Affiliation(s)
- L Vander Elst
- Department of Organic Chemistry, University of Mons-Hainaut, Mons, Belgium
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Van Haverbeke Y, Muller RN, Vander Elst L. pH-Induced motional and conformational changes of amino acids. A reexamination by deuterium longitudinal nuclear relaxation. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j150665a037] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
RATIONALE AND OBJECTIVES The elimination of hepatocyte-directed particulate contrast agents has not been studied in the same detail as particles eliminated mainly by the mononuclear phagocyte system. The aim of the present study was to elucidate the fate of these particles by a multidisciplinary approach. METHODS After intravenous injection of AMI-HS particles directed to the hepatocytes, rats were killed and cytological studies, by both electron microscopy and histochemistry, and spectroscopic studies of the bile were performed. The data were compared with a dynamic magnetic resonance study of the heart and liver. RESULTS The particles were rapidly cleared from the blood by Kupffer cells and hepatocytes and then found first in the vascular and later in the biliary pole of the hepatocytes. After 24 hours, a relaxometric characterization of the bile showed the presence of unchanged particles in the bile. CONCLUSIONS These results show the capacity of the liver to excrete unchanged AMI-HS particles directly into the bile.
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Affiliation(s)
- B Dupas
- Department of Radiology, Hôtel Dieu, Centre Hospitalier Universitaire, Nantes, France.
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Gossuin Y, Roch A, Lo Bue F, Muller RN, Gillis P. Nuclear magnetic relaxation dispersion of ferritin and ferritin-like magnetic particle solutions: a pH-effect study. Magn Reson Med 2001; 46:476-81. [PMID: 11550238 DOI: 10.1002/mrm.1216] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The relaxation mechanism of water protons in the presence of ferritin is still being debated. In this work, the pH dependence of the relaxation induced by ferritin and Fercayl, a ferritin-like akaganeite particle, is studied through T1 and T2 nuclear magnetic relaxation dispersion (NMRD) profiles. To differing extents, the relaxation brought about by both systems is significantly affected by pH. A proton exchange time of 33 ns (at pH 6 and 37 degrees C) is deduced from the fittings of Fercayl T1 NMRD profiles. The linearity of the relationship between 1/T2 and the magnetic field B0 for ferritin and Fercayl solutions is not altered by changes in pH. The parameters of this linearity strongly depend on pH for the latter, while remaining unchanged for the former. These results are interpreted in terms of an exchange between protons belonging to hydroxyl groups at the surface of the particle and bulk water protons.
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Affiliation(s)
- Y Gossuin
- Department of Biological Physics, University of Mons-Hainaut, Mons, Belgium.
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Abstract
Magnetometric and relaxometric data from SPM particles are revisited, leading to a double conclusion rather different from the original one: accounting for the anisotropy energy not only allows a considerable improvement of the fit of the data to theory, but it also invalidates the conclusion obtained from the high field data (without accounting for anisotropy) concerning an important reduction of the diffusion coefficient by the coating of the particles.
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Abstract
Human serum albumin (HSA) binds numerous molecules, among which are suitably designed MRI contrast agents. The rotational tumbling of the protein is thus one of the parameters likely to affect the in vivo relaxivity of these agents. Literature unveils discrepancies about the value of the rotational correlation time (tau(R)) of HSA. In the present work, the tau(R) of this protein has been determined by studying the deuterium relaxation rate of small molecules known for their strong binding to HSA (warfarin and 4-hydroxycoumarin). Values of approx. 20-22 ns are obtained at 310 K in a 4% HSA solution and are in good agreement with the theoretical predictions.
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Affiliation(s)
- L Vander Elst
- NMR Laboratory, Department of Organic Chemistry, University of Mons-Hainaut, B-7000 Mons, Belgium
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Adzamli K, Vander Elst L, Laurent S, Muller RN. Deuterium NMR study of the MP-2269: albumin interaction--a step forward to the dynamics of non-covalent binding. MAGMA 2001; 12:92-5. [PMID: 11390262 DOI: 10.1007/bf02668088] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
MP-2269, the Gd(III) complex of 4-pentylbicyclo[2.2.2]octane-1-carboxyl-di-L-aspartyl-lysine-derived-DTPA, is a small Gd-agent that binds non-covalently to serum albumin in vivo to assume the enhanced relaxivities associated with macromolecular agents, (due in part to increased rotational correlation time, tau(R)). To further explore the fundamental parameters that govern the dynamics of water proton relaxation enhancement by this prototypical albumin-binding agent, the rotational correlation time (tau(R)) for the deuterated La(III) analog of MP-2269 has been independently measured in the presence and absence of 4% albumin using 2H-NMR approaches. The diamagnetic La(III) analog of MP-2269 was deuterated at the alpha-position of the carbonyl groups. 2H-NMR studies were conducted at 7.05T (46 MHz) and 310 degrees K on a Bruker NMR spectrometer. Spectral deconvolution permitted calculation of transverse relaxation rates, 1/T(2), from the NMR linewidths and subsequently, tau(R). The results yielded a tau(R) of the albumin bound complex of approximately 8 ns. This value is intermediate between those earlier estimated by 17O-NMR ( approximately 1 ns) and 1H-NMRD ( approximately 20-50 ns) and significantly shorter than that of albumin. The 2H-NMR study results also indicate that the exchange between free and albumin-bound forms of the La(III) analog is slow (exchange lifetimes >1 ms). This slow exchange does not affect the water residence lifetimes (tau(M) 140-280 ns).
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Affiliation(s)
- K Adzamli
- Imaging Division, Mallinckrodt Inc., 675 McDonnell Blvd., P.O. Box 5840, St. Louis, MO 63134, USA.
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Le Duc G, Vander Elst L, Colet JM, Roch A, Gillis P, Le Bas JF, Muller RN. Ultrasmall particulate iron oxides as contrast agents for magnetic resonance spectroscopy: a dose-effect study. J Magn Reson Imaging 2001; 13:619-26. [PMID: 11276108 DOI: 10.1002/jmri.1087] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Long-distance effects of a superparamagnetic contrast agent (AMI227) were investigated by phosphorus-31 NMR spectroscopy at 7.05 Tesla. In an initial methodological approach, the effects observed on phantoms were compared to the results of theoretical calculations. In a second step, the particles were administered to excised and perfused rat livers (N = 5) and hearts (N = 5) through the perfusion medium for 12 minutes at various concentrations (0.9, 1.8, and 3.6 mM Fe). Organs were subsequently rinsed with the perfusion medium for 42 minutes. During particle perfusion, the spectral lines were shifted and exhibited a strong broadening, although the peak area remained constant, testifying to the inocuity of the material. For hearts only, these disturbances disappeared upon organ rinsing. These through-space susceptibility effects of the particles located in the vessels on phosphorus nuclei, which are strictly confined to the intracellular space, show that high-susceptibility intravascular agents could be useful to evaluate tissue perfusion by contrast-enhanced spectroscopy.
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Affiliation(s)
- G Le Duc
- INSERM U438, CHU, BP217, 38043 Grenoble cedex, France
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Abstract
We conducted relaxometric and water exchange studies of the cationic [Gd((S,S,S,S)-THP)(H2O)]3+ complex (THP 1,4,7,10-tetrakis(2-hydroxy-propyl)-1,4,7,10-tetraazacyclododecane). While the NMRD profiles obtained are typical for DOTA-like complexes (DOTA = 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetate), variable-temperature 7O NMR investigations revealed a relatively high water exchange rate (k(298)(ex) = 1.89 x 10(7) s(-1)). These results differ from those reported for other cationic tetraamide macrocyclic Gd(III) complexes, which exhibit characteristically low exchange rates. Since the low exchange rates are attributed partially to the geometry of the M isomer (square antiprismatic) in the tetraamide derivatives, the atypical water exchange rate observed in [Gd((S,S,S,S)-THP-(H2O)]3+ may result from a twisted square antiprismatic structure in this complex and from the relatively high steric strain at the water coordination site as a result of the presence of methyl groups at the alpha-position with respect to the Gd(III)-bound O atoms of THP.
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Affiliation(s)
- D M Corsi
- Laboratory of Applied Organic Chemistry and Catalysis Delft University of Technology, The Netherlands
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42
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Bremerich J, Colet JM, Giovenzana GB, Aime S, Scheffler K, Laurent S, Bongartz G, Muller RN. Slow clearance gadolinium-based extracellular and intravascular contrast media for three-dimensional MR angiography. J Magn Reson Imaging 2001; 13:588-93. [PMID: 11276103 DOI: 10.1002/jmri.1082] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
The objective of this study was to assess two new slow-clearance contrast media with extracellular and intravascular distribution for magnetic resonance angiography (MRA). Extracellular Gd-DTPA-BC(2)glucA and intravascular Gd(DO3A)(3)-lys(16) were developed within the European Biomed2 MACE Program and compared with two reference compounds, intravascular CMD-A2-Gd-DOTA and extracellular GdDOTA, in 12 rats. Pre- and post-contrast three-dimensional MR (TR/TE = 5 msec/2.2 msec; isotropic voxel size 0.86 mm(3)) was acquired for 2 hours. Signal-to-noise enhancement (DeltaSNR) was calculated. Two minutes after injection, all contrast media provided strong vascular signal enhancement. The DeltaSNR for Gd-DTPA-BC(2)glucA, Gd(DO3A)(3)-lys(16), CMD-A2-Gd-DOTA, and GdDOTA were 13.0 +/- 1.8, 25.0 +/- 3.2, 25.0 +/- 4.0, and 18.0 +/- 3.4, respectively. Gd-DTPA-BC(2)glucA, Gd(DO3A)(3)-lys(16), and CMD-A2-Gd-DOTA cleared slowly from the circulation, whereas GdDOTA cleared rapidly. Vascular DeltaSNR at 2 hours were 2.9 +/- 0.6, 25.0 +/- 3.2, 25.0 +/- 4.0, and 0.4 +/- 1.0. Gd(DO3A)(3)-lys(16) provided strong vascular and minor background enhancement, and thus may be useful for MRA or perfusion imaging. Gd-DTPA-BC(2)glucA produces persistent enhancement of extracellular water, and thus may allow quantification of extracellular distribution volume and assessment of myocardial viability.
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Affiliation(s)
- J Bremerich
- Department of Radiology, University Hospital, Basel, Switzerland.
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43
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Abstract
NMR spectroscopy of intracellularly located (133)Cs has been used to monitor the uptake of Gd-EOB-DTPA by the isolated rat liver. As shown by (31)P spectroscopy, accumulation of (133)Cs ions in hepatocytes does not produce detectable effects on the metabolism. The hepatic internalization of Gd-EOB-DTPA was followed by the paramagnetic relaxation enhancement of the intracellular (133)Cs ions, and confirmed by parallel quantitations of Gd and Cs run by inductively coupled plasma (ICP) analysis of liver samples and aliquots of perfusate. The relaxation data significantly underestimate the Gd content, suggesting a potential compartmentation of Cs(+) and/or the contrast agent. Magn Reson Med 45:711-715, 2001.
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Affiliation(s)
- J M Colet
- Department of Organic Chemistry, NMR Laboratory, University of Mons-Hainaut, Mons, Belgium
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44
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Duarte MG, Gil MH, Peters JA, Colet JM, Elst LV, Muller RN, Geraldes CF. Synthesis, characterization, and relaxivity of two linear Gd(DTPA)-polymer conjugates. Bioconjug Chem 2001; 12:170-7. [PMID: 11312677 DOI: 10.1021/bc000065r] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two linear polyamide conjugates of Gd(DTPA)2- were synthesized and characterized by high-resolution nuclear magnetic resonance (NMR) spectroscopy and size exclusion chromatography (SEC). DTPA was copolymerized with two different diamines, 1,6-hexanediamine and trans-1,4-cyclohexanediamine, yielding the polymers DTPA-HMD and DTPA-CHD, with low polydispersity. Their molecular flexibility in solution was studied using 13C spin-lattice relaxation time measurements, indicating that the cyclohexanediamine linking moiety of the DTPA-HMD polymer is more rigid than that of DTPA-CHD. The influence of the flexibility of the linking functionalities on the relaxivity of the Gd3+-DTPA-polymer conjugates was studied by water nuclear magnetic relaxation dispersion (NMRD). The relaxivity of the Gd(DTPA-CHD) polymer was only slightly higher than that of the Gd(DTPA-HMD) polymer, and only two times higher than the usual values for small Gd-DTPA-like chelates. The low relaxivities obtained for both polymers, much lower than expected from the polymer apparent molecular weights, result from their substantial residual flexibility, and also from a too long, nonoptimal, value of the inner-sphere water exchange rate. These polymeric compounds are also cleared very quickly from the blood of rats, indicating that they are of limited value as blood pool contrast agents for MRA.
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Affiliation(s)
- M G Duarte
- Departamento de Bioquímica, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, Apartado 3126, 3001-301 Coimbra, Portugal
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45
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Vander Elst L, Chapelle F, Laurent S, Muller RN. Stereospecific binding of MRI contrast agents to human serum albumin: the case of Gd-(S)-EOB-DTPA (Eovist) and its (R) isomer. J Biol Inorg Chem 2001; 6:196-200. [PMID: 11293414 DOI: 10.1007/s007750000195] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The water proton relaxation rate enhancement of the hepatospecific Gd-(S)-EOB-DTPA (Eovist) and of its (R) isomer in aqueous solutions free of protein, in serum and in 4% human serum albumin solution, are compared. In the absence of proteins, both compounds exhibit, as expected, the same proton relaxivity, as measured by the nuclear magnetic relaxation dispersion (NMRD) profiles. In serum and albumin solution, non-covalent binding of the paramagnetic complexes to macromolecules is observed. Both isomers are likely to bind to the same site of human serum albumin, but the affinity of the (S) isomer is larger than for the (R) isomer.
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Affiliation(s)
- L Vander Elst
- Department of Organic Chemistry, University of Mons-Hainaut, Belgium
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46
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Abstract
RATIONALE AND OBJECTIVES The suitability of paramagnetic complexes as magnetic resonance contrast agents depends on various factors such as their relaxivity, stability, selectivity, and the inertness toward transmetallation by endogenous ions. The transmetallation of a series of 18 gadolinium complexes by the Zn2+ ion was studied in vitro by proton relaxometry. METHODS Transmetallation was analyzed through the evolution of the paramagnetic longitudinal relaxation rate of water protons at 37 degrees C in pH = 7 phosphate buffer solutions containing 2.5 mmol/L of the gadolinium complexes and 2.5 mmol/L zinc chloride. The measurements were performed at 0.47 T over a period of at least 3 days. RESULTS The results confirm the high stability of macrocyclic systems and a high sensitivity of Gd-diethylenetriamine-pentaacetic acid (DTPA) derivatives to transmetallation by Zn2+ ions. The decreasing order of stability with respect to metal exchange is as follows: Gd-macrocyclics > Gd-C-functionalized DTPA > Gd-DTPA > primary and secondary Gd-DTPA bisamides. The ternary bisamide analyzed in this study [Gd-DTPA-1,11-bisbismethylamino-1,11-dioxo-3,6,9-triaza-3,6,9-tris(carboxymethyl)undecane] is more stable than the parent compound Gd-DTPA. CONCLUSIONS A simple relaxometric protocol has been successfully developed to study the in vitro transmetallation process of gadolinium complexes. The importance of the functionalization and substitution of the DTPA-like complexes is clearly shown.
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Affiliation(s)
- S Laurent
- Department of Organic Chemistry, University of Mons-Hainaut, Mons, Belgium
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47
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Abstract
Magnetic resonance angiography (MRA) has put forth an impetus for the development of macromolecular GdIII complexes that have a prolonged lifetime in the vascular system. Herein, we report the synthesis and GdIII complexation of a new sugar conjugate based on inulin and the DO3A ligand (DO3A = 1,4,7,10-tetraazacyclododecan-1,4,7-triacetic acid). Two API-DO3ASQ conjugates (API = O-(aminopropyl)inulin, SQ = squaric acid = 3,4-dihydroxy-3-cyclobutene-1,2-dione) with different degrees of substitution (ds = 0.7 and ds = 1.5) were prepared from API by using the diethyl ester of squaric acid as a linking agent for the DO3A chelate. The efficacies of the resulting GdIII compounds were evaluated by investigation of their water 1H longitudinal-relaxation-rate enhancements at variable field (NMRD). A dramatic increase in relaxivity was observed in the more highly substituted conjugate (ds = 1.5); this prompted us to do a variable-temperature (17)O study in order to further characterize the relaxation parameters involved in this system. [Gd(API-DO3ASQ)] shows promising properties for application as a contrast agent for MRI.
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Affiliation(s)
- D M Corsi
- Laboratory of Applied Organic Chemistry and Catalysis, Delft University of Technology, The Netherlands
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48
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Abstract
Proton T1 and T2 in solutions of ferritin and fercayl (a ferritin-like iron-dextran particle) solutions were measured, over a wide range of various parameters (Bo, temperature, interecho-time and pH). The window of the previously referred linear dependence of 1/T2 on the static field was increased, up to 500 MHz, and the independence of T2 on the echo time was confirmed. Correlation times were extracted from T1 nuclear magnetic relaxation dispersion profiles. In the pH range studied, no strong variation of the relaxivities of ferritin solutions was noticed. Fercayl, which, unlike ferritin, remains stable under large pH variations, is characterized by strongly pH-dependent relaxation rates. This feature is interpreted as due to the effect of proton exchange in the water relaxation process. Outer sphere theory, which ignores proton binding, is shown to be unable to describe the relaxation of ferritin and ferritin-like particles solutions, first because it predicts a quadratic rate dependence on Bo, but also because it severely underestimates the relaxation rate. Explaining relaxation induced by ferritin and ferritin-like particle solutions will likely require a model that accounts for proton binding.
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Affiliation(s)
- Y Gossuin
- Biological Physics Department, University of Mons-Hainaut, Mons, Belgium
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49
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Abstract
The aim of this work was to evaluate the potential of T(2)-weighted, steady-state susceptibility-enhanced contrast magnetic resonance imaging (MRI), to characterize brain tumor heterogeneity and tumor vascularization. In vivo T(2)-weighted MRI experiments were carried out on normal rats (n = 11) and rats bearing C6 glioma (n = 17), before and after the injection of a remanent superparamagnetic contrast agent. The DeltaR(2) variations of the transverse relaxation rate due to the injection of the contrast agent were used to generate relative cerebral blood volume (CBV) maps. Contrast enhancement of the tumor was shown to reflect tissue vascularization rather than leakage of the blood-brain barrier. The quantitative results clearly show the heterogeneity of tumor vascularization and reveal a high vessel density in the peripheral area (CBV(per) approximately 17.2 +/- 2.3 sec(-1)) and a low vessel density in the central area of the tumor (CBV(cen) approximately 2.5 +/- 0.5 sec(-1)). Magn Reson Med 42:754-761, 1999.
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Affiliation(s)
- G Le Duc
- INSERM U438, CHU, BP 217, Grenoble Cédex, France
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50
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Lerski RA, Schad LR, Luypaert R, Amorison A, Muller RN, Mascaro L, Ring P, Spisni A, Zhu X, Bruno A. Multicentre magnetic resonance texture analysis trial using reticulated foam test objects. Magn Reson Imaging 1999; 17:1025-31. [PMID: 10463653 DOI: 10.1016/s0730-725x(99)00034-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Texture analysis in magnetic resonance imaging has the ability to provide useful diagnostic information with respect to the discrimination of disease states of a single tissue or the separation of different tissues. However, for widespread use it is necessary to determine how texture measurements carried out in one center relate to those carried out in another. To this end, a multicentre trial has been performed where reticulated foam test objects have been scanned in six European centers according to a fixed protocol. It has been concluded that texture measurements are not transportable between centers. Principal component models calculated from the texture parameters collected in one center do not fit the data collected in another. Further trials are to investigate whether the reticulated foam test objects may be used to normalize tissue texture data collected in different centers.
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Affiliation(s)
- R A Lerski
- Department of Medical Physics, Ninewells Hospital and Medical School, Dundee, UK.
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