1
|
Cai Z, Jiang L, Cao Y, Fu S, Wang S, Jiang Y, Gu H, Li N, Fu X, Tang S, Zhu J, Cao W, Zhong L, Cheng Z, Xia C, Lui S, Song B, Gong Q, Ai H. Lipophilic Group-Modified Manganese(II)-Based Contrast Agents for Vascular and Hepatobiliary Magnetic Resonance Imaging. J Med Chem 2024. [PMID: 38450627 DOI: 10.1021/acs.jmedchem.4c00120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2024]
Abstract
Effective vascular and hepatic enhancement and better safety are the key drivers for exploring gadolinium-free hepatobiliary contrast agents. Herein, a facile strategy proposes that the high lipophilicity may be favorable to enhancing sequentially vascular and hepatobiliary signal intensity based on the structure-activity relationship that both hepatic uptake and interaction with serum albumins partly depend on lipophilicity. Therefore, 11 newly synthesized derivatives of manganese o-phenylenediamine-N,N,N',N'-tetraacetic acid (MnLs) were evaluated as vascular and hepatobiliary agents. The maximum signal intensities of the heart, liver, and kidneys were strongly correlated with log P, a key indicator of lipophilicity. The most lipophilic agent, MnL6, showed favorable relaxivity when binding with serum albumin, good vascular enhancement, rapid excretion, and reliable hepatobiliary phases comparable to a classic hepatobiliary agent, gadolinium ethoxybenzyl diethylenetriamine pentaacetic acid (Gd-EOB-DTPA) for in vivo liver tumor imaging. Inhibition experiments confirmed the hepatic targeting of MnL6 is mediated by organic anion-transporting polypeptides.
Collapse
Affiliation(s)
- Zhongyuan Cai
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610065, China
- College of Biomedical Engineering, Sichuan University, Chengdu 610065, China
| | - Lingling Jiang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610065, China
- College of Biomedical Engineering, Sichuan University, Chengdu 610065, China
| | - Yingzi Cao
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610065, China
- College of Biomedical Engineering, Sichuan University, Chengdu 610065, China
| | - Shengxiang Fu
- Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Shasha Wang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610065, China
- College of Biomedical Engineering, Sichuan University, Chengdu 610065, China
| | - Yuting Jiang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610065, China
- College of Biomedical Engineering, Sichuan University, Chengdu 610065, China
| | - Haojie Gu
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610065, China
- College of Biomedical Engineering, Sichuan University, Chengdu 610065, China
| | - Na Li
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610065, China
- College of Biomedical Engineering, Sichuan University, Chengdu 610065, China
| | - Xiaomin Fu
- Department of Radiology, West China Second University Hospital, Sichuan University, Chengdu 610065, China
| | - Shimin Tang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610065, China
- College of Biomedical Engineering, Sichuan University, Chengdu 610065, China
| | - Jiang Zhu
- Sichuan Key Laboratory of Medical Imaging, North Sichuan Medical College, Nanchong 637000, China
- Nanchong Key Laboratory of MRI Contrast Agent, North Sichuan Medical College, Nanchong 637000, China
| | - Weidong Cao
- Sichuan Key Laboratory of Medical Imaging, North Sichuan Medical College, Nanchong 637000, China
- Nanchong Key Laboratory of MRI Contrast Agent, North Sichuan Medical College, Nanchong 637000, China
| | - Lei Zhong
- Sichuan Key Laboratory of Medical Imaging, North Sichuan Medical College, Nanchong 637000, China
- Nanchong Key Laboratory of MRI Contrast Agent, North Sichuan Medical College, Nanchong 637000, China
| | - Zhuzhong Cheng
- Department of Nuclear Medicine, Sichuan Clinical Research Center for Cancer, Sichuan Cancer Hospital and Institute, Sichuan Cancer Center, Affiliated Cancer Hospital of University of Electronic Science and Technology of China, Chengdu 610041, China
| | - Chunchao Xia
- Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Su Lui
- Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Bin Song
- Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Qiyong Gong
- Huaxi MR Research Center (HMRRC), Department of Radiology, West China Hospital of Sichuan University, Chengdu 610041, China
- Psychoradiology Research Unit of Chinese Academy of Medical Sciences, Sichuan University, Chengdu 610041, China
| | - Hua Ai
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610065, China
- College of Biomedical Engineering, Sichuan University, Chengdu 610065, China
- Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China
| |
Collapse
|
2
|
Modulating the Properties of Fe(III) Macrocyclic MRI Contrast Agents by Appending Sulfonate or Hydroxyl Groups. Molecules 2020; 25:molecules25102291. [PMID: 32414058 PMCID: PMC7288058 DOI: 10.3390/molecules25102291] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 05/07/2020] [Accepted: 05/10/2020] [Indexed: 12/30/2022] Open
Abstract
Complexes of Fe(III) that contain a triazacyclononane (TACN) macrocycle, two pendant hydroxyl groups, and a third ancillary pendant show promise as MRI contrast agents. The ancillary group plays an important role in tuning the solution relaxivity of the Fe(III) complex and leads to large changes in MRI contrast enhancement in mice. Two new Fe(III) complexes, one with a third coordinating hydroxypropyl pendant, Fe(L2), and one with an anionic non-coordinating sulfonate group, Fe(L1)(OH2), are compared. Both complexes have a deprotonated hydroxyl group at neutral pH and electrode potentials representative of a stabilized trivalent iron center. The r1 relaxivity of the Fe(L1)(OH2) complex is double that of the saturated complex, Fe(L2), at 4.7 T, 37 °C in buffered solutions. However, variable-temperature 17O-NMR experiments show that the inner-sphere water of Fe(L1)(OH2) does not exchange rapidly with bulk water under these conditions. The pendant sulfonate group in Fe(L1)(OH2) confers high solubility to the complex in comparison to Fe(L2) or previously studied analogues with benzyl groups. Dynamic MRI studies of the two complexes showed major differences in their pharmacokinetics clearance rates compared to an analogue containing a benzyl ancillary group. Rapid blood clearance and poor binding to serum albumin identify Fe(L1)(OH2) for development as an extracellular fluid contrast agent.
Collapse
|
3
|
Chadha N, Singh D, Milton MD, Mishra G, Daniel J, Mishra AK, Tiwari AK. Computational prediction of interaction and pharmacokinetics profile study for polyamino-polycarboxylic ligands on binding with human serum albumin. NEW J CHEM 2020. [DOI: 10.1039/c9nj05594k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Human serum albumin (HSA) is one of the most abundant plasma proteins available in blood and responsible for transport of fatty acids, drugs and metabolites at its binding sites which are very important for the assessment of pharmacokinetics profile of the polyamino-polycarboxylic ligands.
Collapse
Affiliation(s)
- Nidhi Chadha
- Division of Cyclotron and Radiopharmaceutical Sciences
- Institute of Nuclear Medicine and Allied Sciences
- Delhi 110054
- India
- Department of Chemistry
| | - Dushyant Singh
- Department of Chemistry
- Christ Church P. G. College
- C S J M University
- Kanpur
- India
| | | | - Gauri Mishra
- Department of Zoology
- Swami Shraddhanand College
- University of Delhi
- Delhi 110036
- India
| | - Joseph Daniel
- Department of Chemistry
- Christ Church P. G. College
- C S J M University
- Kanpur
- India
| | - Anil K. Mishra
- Division of Cyclotron and Radiopharmaceutical Sciences
- Institute of Nuclear Medicine and Allied Sciences
- Delhi 110054
- India
| | - Anjani K. Tiwari
- Division of Cyclotron and Radiopharmaceutical Sciences
- Institute of Nuclear Medicine and Allied Sciences
- Delhi 110054
- India
- Department of Chemistry
| |
Collapse
|
4
|
Xu YQ, Luo J, Chen ZN. Zn2+-Responsive Bimodal Magnetic Resonance Imaging and Fluorescence Imaging Agents and Their Interaction with Human Serum Albumin. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402197] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
5
|
Tang J, Sheng Y, Hu H, Shen Y. Macromolecular MRI contrast agents: Structures, properties and applications. Prog Polym Sci 2013. [DOI: 10.1016/j.progpolymsci.2012.07.001] [Citation(s) in RCA: 118] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
6
|
Boros E, Caravan P. Structure-relaxivity relationships of serum albumin targeted MRI probes based on a single amino acid Gd complex. J Med Chem 2013; 56:1782-6. [PMID: 23391162 PMCID: PMC3656968 DOI: 10.1021/jm4000177] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The Gd(III) complex of DO3A-N-α-aminopropionate, Gd(DOTAla), was used to generate a small library of putative MRI probes targeted to human serum albumin (HSA). Ten compounds were synthesized via multistep organic synthesis, and the corresponding Gd complexes were investigated for their affinity to HSA, lipophilicity, and relaxivity in the absence and presence of HSA. Negative charge and moderate lipophilicity correlate with increased HSA affinity and relaxivity.
Collapse
Affiliation(s)
- Eszter Boros
- The Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, 149 Thirteenth Street, Suite 2301, Charlestown, MA 02129
| | - Peter Caravan
- The Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, 149 Thirteenth Street, Suite 2301, Charlestown, MA 02129
| |
Collapse
|
7
|
Garcia J, Allen MJ. Interaction of Biphenyl-Functionalized Eu(2+)-Containing Cryptate with Albumin: Implications to Contrast Agents in Magnetic Resonance Imaging. Inorganica Chim Acta 2012; 393:324-327. [PMID: 23162162 PMCID: PMC3496275 DOI: 10.1016/j.ica.2012.07.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The influence of albumin on the efficacy of a Eu(2+)-containing complex capable of interacting with human serum albumin (HSA) was investigated at different field strengths (1.4, 3, 7, 9.4, and 11.7 T). Relaxometric measurements indicated that the presence of albumin at higher field strengths (>3 T) did not result in an increase in the relaxivity of the Eu(2+) complex, but a relaxation enhancement of 171 ± 11% was observed at 1.4 T. Titration experiments using different percentages (2, 4.5, 6, 10, 15, and 25% w/v) of HSA and variable-temperature (17)O NMR measurements were performed to understand the effect of albumin on the molecular properties of the biphenyl-functionalized Eu(2+) complex that are relevant to magnetic resonance imaging.
Collapse
Affiliation(s)
- Joel Garcia
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, USA
| | - Matthew J. Allen
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, USA
| |
Collapse
|
8
|
Moriggi L, Yaseen MA, Helm L, Caravan P. Serum albumin targeted, pH-dependent magnetic resonance relaxation agents. Chemistry 2012; 18:3675-86. [PMID: 22328098 PMCID: PMC3304010 DOI: 10.1002/chem.201103344] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2011] [Indexed: 11/11/2022]
Abstract
The objective of this work was the synthesis of serum albumin targeted, Gd(III)-based magnetic resonance imaging (MRI) contrast agents exhibiting a strong pH-dependent relaxivity. Two new complexes (Gd-glu and Gd-bbu) were synthesized based on the DO3A macrocycle modified with three carboxyalkyl substituents α to the three ring nitrogen atoms, and a biphenylsulfonamide arm. The sulfonamide nitrogen coordinates the Gd in a pH-dependent fashion, resulting in a decrease in the hydration state, q, as pH is increased and a resultant decrease in relaxivity (r(1)). In the absence of human serum albumin (HSA), r(1) increases from 2.0 to 6.0 mM(-1) s(-1) for Gd-glu and from 2.4 to 9.0 mM(-1) s(-1) for Gd-bbu from pH 5 to 8.5 at 37 °C, 0.47 T, respectively. These complexes (0.2 mM) are bound (>98.9 %) to HSA (0.69 mM) over the pH range 5-8.5. Binding to albumin increases the rotational correlation time and results in higher relaxivity. The r(1) increased 120 % (pH 5) and 550 % (pH 8.5) for Gd-glu and 42 % (pH 5) and 260 % (pH 8.5) for Gd-bbu. The increases in r(1) at pH 5 were unexpectedly low for a putative slow tumbling q=2 complex. The Gd-bbu system was investigated further. At pH 5, it binds in a stepwise fashion to HSA with dissociation constants K(d1)=0.65, K(d2)=18, K(d3)=1360 μM. The relaxivity at each binding site was constant. Luminescence lifetime titration experiments with the Eu(III) analogue revealed that the inner-sphere water ligands are displaced when the complex binds to HSA resulting in lower than expected r(1) at pH 5. Variable pH and temperature nuclear magnetic relaxation dispersion (NMRD) studies showed that the increased r(1) of the albumin-bound q=0 complexes is due to the presence of a nearby water molecule with a long residency time (1-2 ns). The distance between this water molecule and the Gd ion changes with pH resulting in albumin-bound pH-dependent relaxivity.
Collapse
Affiliation(s)
- Loïck Moriggi
- A. A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA 02129 (USA)
| | - Mohammad A. Yaseen
- A. A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA 02129 (USA)
| | - Lothar Helm
- Institut de Chimie Moléculaire et Biologique, Ecole Polytechnique Fédérale de Lausanne, EPFL-BCH, 1015 Lausanne (Switzerland)
| | - Peter Caravan
- A. A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA 02129 (USA)
| |
Collapse
|
9
|
Frullano L, Caravan P. Strategies for the preparation of bifunctional gadolinium(III) chelators. Curr Org Synth 2011; 8:535-565. [PMID: 22375102 DOI: 10.2174/157017911796117250] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The development of gadolinium chelators that can be easily and readily linked to various substrates is of primary importance for the development high relaxation efficiency and/or targeted magnetic resonance imaging (MRI) contrast agents. Over the last 25 years a large number of bifunctional chelators have been prepared. For the most part, these compounds are based on ligands that are already used in clinically approved contrast agents. More recently, new bifunctional chelators have been reported based on complexes that show a more potent relaxation effect, faster complexation kinetics and in some cases simpler synthetic procedures. This review provides an overview of the synthetic strategies used for the preparation of bifunctional chelators for MRI applications.
Collapse
Affiliation(s)
- Luca Frullano
- Case Western Reserve University. 11100 Euclid Ave Cleveland, OH 44106
| | | |
Collapse
|
10
|
Lin YH, Dayananda K, Chen CY, Liu GC, Luo TY, Hsu HS, Wang YM. In vivo MR/optical imaging for gastrin releasing peptide receptor of prostate cancer tumor using Gd-TTDA-NP-BN-Cy5.5. Bioorg Med Chem 2011; 19:1085-96. [DOI: 10.1016/j.bmc.2010.04.040] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2010] [Revised: 04/13/2010] [Accepted: 04/15/2010] [Indexed: 11/16/2022]
|
11
|
Chang YH, Chen CY, Singh G, Chen HY, Liu GC, Goan YG, Aime S, Wang YM. Synthesis and Physicochemical Characterization of Carbon Backbone Modified [Gd(TTDA)(H2O)]2− Derivatives. Inorg Chem 2011; 50:1275-87. [DOI: 10.1021/ic101799c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
| | - Chiao-Yun Chen
- Department of Medical Imaging, Kaohsiung Medical University Hospital
- Department of Radiology
| | - Gyan Singh
- Department of Biological Science and Technology
| | | | - Gin-Chung Liu
- Department of Medical Imaging, Kaohsiung Medical University Hospital
- Department of Radiology
| | - Yih-Gang Goan
- Department of Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
- Department of Nursing, Yuh-Ing Junior College of Health Care & Management, Kaohsiung, Taiwan
| | - Silvio Aime
- Department of Chemistry IFM and Molecular Imaging Center, University of Torino, Torino, Italy
| | - Yun-Ming Wang
- Department of Biological Science and Technology
- Institute of Molecular Medicine and Bioengineering
| |
Collapse
|
12
|
Kasala D, Lin TS, Chen CY, Liu GC, Kao CL, Cheng TL, Wang YM. [Gd(Try-TTDA)(H2O)]2−: A new MRI contrast agent for copper ion sensing. Dalton Trans 2011; 40:5018-25. [DOI: 10.1039/c1dt10033e] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
13
|
Polášek M, Šedinová M, Kotek J, Vander Elst L, Muller RN, Hermann P, Lukeš I. Pyridine-N-oxide Analogues of DOTA and Their Gadolinium(III) Complexes Endowed with a Fast Water Exchange on the Square-Antiprismatic Isomer. Inorg Chem 2008; 48:455-65. [DOI: 10.1021/ic801596v] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Miloslav Polášek
- Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic, and NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons-Hainaut, Avenue du champ de Mars 24, B-7000 Mons, Belgium
| | - Miroslava Šedinová
- Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic, and NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons-Hainaut, Avenue du champ de Mars 24, B-7000 Mons, Belgium
| | - Jan Kotek
- Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic, and NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons-Hainaut, Avenue du champ de Mars 24, B-7000 Mons, Belgium
| | - Luce Vander Elst
- Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic, and NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons-Hainaut, Avenue du champ de Mars 24, B-7000 Mons, Belgium
| | - Robert N. Muller
- Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic, and NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons-Hainaut, Avenue du champ de Mars 24, B-7000 Mons, Belgium
| | - Petr Hermann
- Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic, and NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons-Hainaut, Avenue du champ de Mars 24, B-7000 Mons, Belgium
| | - Ivan Lukeš
- Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic, and NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons-Hainaut, Avenue du champ de Mars 24, B-7000 Mons, Belgium
| |
Collapse
|
14
|
Nanotemplate-Engineered Nanoparticles Containing Gadolinium for Magnetic Resonance Imaging of Tumors. Invest Radiol 2008; 43:129-40. [DOI: 10.1097/rli.0b013e31815878dd] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
15
|
Dumas S, Troughton JS, Cloutier NJ, Chasse JM, McMurry TJ, Caravan P. A High Relaxivity Magnetic Resonance Imaging Contrast Agent Targeted to Serum Albumin. Aust J Chem 2008. [DOI: 10.1071/ch08164] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
EP-647 is a serum albumin-targeted magnetic resonance imaging contrast agent comprising a GdDTPA (DTPA, diethylenetriaminepentaacetate) chelate for magnetic resonance signal generation linked via a phosphodiester to a substituted biphenyl for albumin targeting. Albumin binding and relaxivity are higher than the benchmark magnetic resonance angiographic agent MS-325. EP-647 binds primarily to a unique site on serum albumin that is different from the MS-325 site and the binding sites of other drugs.
Collapse
|
16
|
Murray BS, New EJ, Pal R, Parker D. Critical evaluation of five emissive europium(iii) complexes as optical probes: correlation of cytotoxicity, anion and protein affinity with complex structure, stability and intracellular localisation profile. Org Biomol Chem 2008; 6:2085-94. [DOI: 10.1039/b803895c] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
17
|
Nonat A, Fries PH, Pécaut J, Mazzanti M. Structure, Stability, Dynamics, High-Field Relaxivity and Ternary-Complex Formation of a New Tris(aquo) Gadolinium Complex. Chemistry 2007; 13:8489-506. [PMID: 17659512 DOI: 10.1002/chem.200601856] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The tripodal hexadentate picolinate ligand dpaa3- (H3dpaa=N,N'-bis[(6-carboxypyridin-2-yl)methyl]glycine) has been synthesised. It can form 1:1 and 1:2 lanthanide/ligand complexes. The crystal structure of the bis(aquo) lutetium complex [Lu(dpaa)(H2O)2] has been determined by X-ray diffraction studies. The number of water molecules was determined by luminescence lifetime studies of the terbium and europium complexes. The tris(aquo) terbium complex shows a fairly high luminescence quantum yield (22 %). The [Gd(dpaa)(H2O)3] complex displays a high water solubility and an increased stability (pGd=12.3) with respect to the analogous bis(aquo) complex [Gd(tpaa)(H2O)2] (pGd=11.2). Potentiometric and relaxometric studies show the formation of a soluble GdIII hydroxo complex at high pH values. A unique aquohydroxo gadolinium complex has been isolated and its crystal structure determined. This complex crystallises as a 1D polymeric chain consisting of square-shaped tetrameric units. In heavy water, the [Gd(dpaa)-(D2O)3] complex shows a quite high HOD proton relaxivity at high field (11.93 s(-1) mM(-1) at 200 MHz and 298 K) because of the three inner-sphere water molecules. The formation of ternary complexes with physiological anions has been monitored by relaxometric studies, which indicate that even under conditions favourable to the formation of adducts with oxyanions, the mean relaxivity remains higher than those of most of the currently used commercial contrast agents except for the citrate. However, the measured relaxivity (r1=7.9 s(-1) mM(-1)) in a solution containing equimolar concentrations of [Gd(dpaa)(D2O)3] and citrate is still high. The interaction with albumin has been investigated by relaxometric and luminescence studies. Finally, a new versatile method to unravel the geometric and dynamic molecular factors that explain the high-field relaxivities has been developed. This approach uses a small, uncharged non-coordinating probe solute, the outer-sphere relaxivity of which mimics that of the water proton. Only a routine NMR spectrometer and simple mathematical analysis are required.
Collapse
Affiliation(s)
- Aline Nonat
- Laboratoire de Reconnaissance Ionique and Chimie de Coordination, Service de Chimie Inorganique et Biologique, Département de Recherche Fondamentale sur la Matière Condensée, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble, Cedex 09, France
| | | | | | | |
Collapse
|
18
|
Chang YT, Cheng CM, Su YZ, Lee WT, Hsu JS, Liu GC, Cheng TL, Wang YM. Synthesis and characterization of a new bioactivated paramagnetic gadolinium(III) complex [Gd(DOTA-FPG)(H2O)] for tracing gene expression. Bioconjug Chem 2007; 18:1716-27. [PMID: 17935289 DOI: 10.1021/bc070019s] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A smart contrast agent for magnetic resonance imaging (MRI) can be used to exploit an enzymatic activity specific to the tissue or disease state signified by converting an MRI-inactivated agent to an activated MRI agent. In this study, a beta-galactopyranose-containing gadolinium(III) complex [Gd(DOTA-FPG)(H 2O)] was designed, synthesized, and characterized as being potentially suitable for a bioactivated MRI contrast agent. The (17)O NMR experiments were conducted to estimate the water exchange rate k e x 298 and rotational correlation time tau R 298 . The k ex 298 value of [Gd(DOTA-FPG)(H 2O)] is similar to that of [Gd(DO3A-bz-NO 2)(H 2O)]. The rotational correlation time value of [Gd(DOTA-FPG)(H 2O)] is dramatically longer than that of [Gd(DOTA)(H 2O)] (-) Relaxometric studies show that the percentage change in the T 1 value of [Gd(DOTA-FPG)(H 2O)] decreases dramatically in the presence of beta-galactosidase and human serum albumin. The T(1) change percentage of [Gd(DOTA-FPG)(H 2O)] (60%) is significantly higher than those of Egad and gadolinium(III)-1-(4-(2-(1-(4,7,10-triscarboxymethyl-(1,4,7,10-tetraazacyclododecyl)))-ethylcarbamoyloxymethyl)-2-nitrophenyl)-beta- d-glucopyronuronate. The signal intensity of the MR image for [Gd(DOTA-FPG)(H 2O)] in the presence of human serum albumin and beta-galactosidase (2670 +/- 210) is significantly higher than that of [Gd(DOTA-FPG)(H 2O)] in the sodium phosphate buffer solution (1490 +/- 160). In addition, the MR images show a higher-intensity enhancement in CT26/beta-gal tumor with beta-galactosidase gene expression but not for the CT26 tumor without beta-galactosidase gene expression. We conclude that [Gd(DOTA-FPG)(H 2O)] is a suitable candidate for a bioactivated MRI contrast agent in tracing gene expression.
Collapse
Affiliation(s)
- Yu-Ton Chang
- Faculty of Medicinal and Applied Chemistry, Faculty of Biomedical Science and Environmental Biology, Department of Radiology, Kaohsiung Municipal Hsiao-Kang Hospital, Kaohsiung, Taiwan
| | | | | | | | | | | | | | | |
Collapse
|
19
|
Gianolio E, Giovenzana GB, Longo D, Longo I, Menegotto I, Aime S. Relaxometric and Modelling Studies of the Binding of a Lipophilic Gd-AAZTA Complex to Fatted and Defatted Human Serum Albumin. Chemistry 2007; 13:5785-97. [PMID: 17407109 DOI: 10.1002/chem.200601277] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A new lipophilic gadolinium chelate consisting of a long aliphatic chain bound to the AAZTA coordination cage (Gd-AAZTAC17) has been synthesised. It possesses two coordinated water molecules (q=2) in fast exchange with the solvent (tau298(M) = 67 ns), which yields a relaxivity of 10.2 mM(-1) s(-1). At concentrations greater than 0.1 mM, it forms micelles (average diameter 5.5 nm) characterised by a relaxivity of approximately 30 mM(-1) s(-1) at 20 MHz and 298 K. The latter value appears to be "quenched" by magnetic interactions among the Gd(III) ions on the surface of the micelle that cause a decrease in the electronic relaxation time. A relaxivity of 41 mM(-1) s(-1) was recorded for this micellar system when 98 % of the Gd(III) ions were replaced by diamagnetic Y(III). Gd-AAZTAC17 exhibits a better affinity for fatted human serum albumin (HSA) than for defatted HSA, whereas the relaxivities of the supramolecular adducts are reversed. The relaxivity shown by Gd-AAZTAC17/defatted HSA ({r b(1) (20 MHz, 298 K)=84 mM(-1) s(-1)) is by far the highest relaxivity reported so far for non-covalent paramagnetic adducts with slow-moving substrates. As shown by molecular docking calculations, the gadolinium complex enters a hydrophobic pocket present in fatted HSA more extensively than the corresponding adduct with defatted HSA. Interestingly, no marked difference was observed in either the relaxation enhancement or the binding affinity between fatted and defatted HSA when the binding titrations were carried out at a Gd-AAZTAC17 concentration higher than its critical micellar concentration (cmc). This behaviour has been attributed to the formation of an association between the negatively charged micelle of the lipophilic metal complexes and the positive residues on the surface of the protein.
Collapse
Affiliation(s)
- Eliana Gianolio
- Dipartimento di Chimica I.F.M. e Centro di eccellenza per l'Imaging Molecolare, Università degli Studi di Torino, Via P. Giuria 7, 10125 Torino, Italy
| | | | | | | | | | | |
Collapse
|
20
|
Ou MH, Chen YM, Chang YH, Lu WK, Liu GC, Wang YM. Synthesis, complexation and water exchange properties of Gd(iii)–TTDA-mono and bis(amide) derivatives and their binding affinity to human serum albumin. Dalton Trans 2007:2749-59. [PMID: 17592591 DOI: 10.1039/b703211k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
With the objective of tuning the lipophilicity of ligands and maintaining the neutrality and stability of Gd(III) chelate, we designed and synthesized two bis(amide) derivatives of TTDA, TTDA-BMA and TTDA-BBA, and a mono(amide) derivative, TTDA-N-MOBA. The ligand protonation constants and complex stability constants for various metal ions were determined in this study. The identification of the microscopic sites of protonation of the amide ligand by 1H NMR titrations show that the first protonation site occurs on the central nitrogen atom. The values of the stability constant of TTDA-mono and bis(amide) complex are significantly lower than those of TTDA and DTPA, but the selectivity constants of these ligands for Gd(III) over Zn(II) and Cu(II) are slightly higher than those of TTDA and DTPA. On the basis of the water-exchange rate values available for [Gd(TTDA-BMA)(H2O)], [Gd(TTDA-BBA)(H2O)] and [Gd(TTDA-N-MOBA)(H2O)]-, we can state that, in general, the replacement of one carboxylate group by an amide group decreases the water-exchange rate of the gadolinium(III) complexes by a factor of about three to five. The decrease in the exchange rate is explained in terms of a decreased steric crowding and charge effect around the metal ion when carboxylates are replaced by an amide group. In addition, to support the HSA protein binding studies of lipophilic [Gd(TTDA-N-MOBA)(H2O)]- and [Gd(TTDA-BBA)(H2O)] complexes, further protein-complex binding was studied by ultrafiltration and relaxivity studies. The binding constants (KA) of [Gd(TTDA-N-MOBA)(H2O)]- and [Gd(TTDA-BBA)(H2O)] are 8.6 x 10(2) and 1.0 x 10(4) dm3 mol(-1), respectively. The bound relaxivities (r1(b)) are 51.8 and 52 dm3 mmol(-1) s(-1), respectively. The KA value of [Gd(TTDA-BBA)(H2O)] is similar to that of MS-325 and indicates a stronger interaction of [Gd(TTDA-BBA)(H2O)] with HSA.
Collapse
Affiliation(s)
- Ming-Hung Ou
- Faculty of Medicinal and Applied Chemistry, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 807, Taiwan
| | | | | | | | | | | |
Collapse
|
21
|
Cheng TH, Lee WT, Jeng JS, Wu CM, Liu GC, Chiang MYN, Wang YM. Synthesis and characterization of a novel paramagnetic macromolecular complex [Gd(TTDASQ–protamine)]. Dalton Trans 2006:5149-55. [PMID: 17077888 DOI: 10.1039/b604783a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Adenocarcinomas in rats and humans frequently contain perivascular, degranulating mast cells that release heparin. Protamine is a low-molecular weight, cationic polypeptide that binds to heparin and neutralizes its anticoagulant properties. A novel magnetic resonance imaging (MRI) contrast agent containing protamine was synthesized. TTDASQ, the derivative of TTDA (3,6,10-tri(carboxymethyl)-3,6,10-triazadodecanedioic acid), was also synthesized and the kinetic stability of [Gd(TTDASQ)]- chelate containing phosphate buffer and ZnCl2 to measure the relaxation rate (R1) at 20 MHz was studied by transmetallation with Zn(II). The water-exchange rate (k(ex)298) of [Gd(TTDASQ)]- is 6.4 x 10(6) s(-1) at 25.0 +/- 0.1 degrees C which was obtained from the reduced 17O relaxation rates (1/T(1r) and 1/T(2r)) and chemical shift (omega(r)) of H(2)17O, and it is compared with that previously reported for the other gadolinium(III) complex, [Gd(DO3ASQ)]. The binding affinity assay showed that the (TTDASQ)3-pro19 has higher activity toward heparin. On the other hand, the effect of heparin on the relaxivity of the [Gd(TTDASQ)3-pro19] conjugate shows the binding strength (K(A)) is 7669 dm3 mol(-1) at pH 7.4 and the relaxivity (r(b)1) of the [Gd(TTDASQ)3-pro19]-heparin adduct is 30.9 dm3 mmol(-1) s(-1).
Collapse
Affiliation(s)
- Tsan-Hwang Cheng
- Department of Biological Science and Technology, Chung Hwa College of Medical Technology, 89, Wunhua 1st Street, Rende Township, Tainan County, 717, Taiwan, ROC
| | | | | | | | | | | | | |
Collapse
|