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Wang Y, Liu J, Jiang N, Yang J, Yang C, Liu Y. Highly Crystalline Multivariate Prussian Blue Analogs via Equilibrium Chelation Strategy for Stable and Fast Charging Sodium-Ion Batteries. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2403211. [PMID: 38958082 DOI: 10.1002/smll.202403211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2024] [Revised: 06/17/2024] [Indexed: 07/04/2024]
Abstract
Prussian blue analogs (PBAs) have been widely recognized as superior cathode materials for sodium-ion batteries (SIBs) owing to numerous merits. However, originating from the rapid crystal growth, PBAs still suffer from considerable vacancy defects and interstitial water, making the preparation of long-cycle-life PBAs the greatest challenge for its practical application. Herein, a novel equilibrium chelation strategy is first proposed to synthesize a high crystallinity (94.7%) PBAs, which is realized by modulating the chelating potency of strong chelating agents via "acid effect" to achieve a moderate chelating effect, forcefully breaking through the bottleneck of poor cyclic stability for PBAs cathodes. Impressively, the as-prepared highly crystalline PBAs represent an unprecedented level of electrochemical performance including ultra-long lifespan (10000 cycles with 86.32% capacity maintenance at 6 A g-1), excellent rate capability (82.0 mAh g-1 at 6 A g-1). Meanwhile, by pairing with commercial hard carbon, the as-prepared PBAs-based SIBs exhibit high energy density (350 Wh kg-1) and excellent capacity retention (82.4% after 1500 cycles), highlighting its promising potential for large-scale energy storage applications.
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Affiliation(s)
- Yichao Wang
- Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Jiahe Liu
- Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Ning Jiang
- Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Jianhua Yang
- Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Cheng Yang
- Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Yu Liu
- Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
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2
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Martinelli J, Romano E, Laczovics A, Horváth D, Grattoni E, Baranyai Z, Tei L. Improving the Stability and Kinetic Inertness of Mn(II) Complexes by Increasing the Bridge Length in Bicyclic CDTA-Like Ligands. Chemistry 2024; 30:e202400570. [PMID: 38597334 DOI: 10.1002/chem.202400570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Revised: 04/08/2024] [Accepted: 04/10/2024] [Indexed: 04/11/2024]
Abstract
Kinetic inertness of Mn(II)-based MRI contrast agents can be improved by increasing the rigidity of the polydentate ligand that tightly coordinate the metal ion. Taking inspiration from the remarkable increase in kinetic inertness of [Mn(CDTA)]2- compared to [Mn(EDTA)]2- due to the cyclohexyl backbone rigidity, we devised that bicyclic ligands would further improve the kinetic inertness of the Mn(II) complexes. The length of the alkyl bridge on the cyclohexane ring was varied from methylene (BCH-DTA), ethylene (BCO-DTA) to propylene (BCN-DTA) to evaluate the influence of the different trans-diaminotetraacetate ligands on relaxometric, thermodynamic and kinetic properties of the Mn(II) complexes. 1H and 17O NMR relaxometric studies showed a slight increase in relaxivity and a faster water exchange rate in these Mn(II)-complexes with respect to [Mn(CDTA)]2-. Solution studies revealed that the conditional stability (pMn) and dissociation half-life (t1/2) at pH 7.4 follow the order [Mn(BCH-DTA)]2-<[Mn(BCO-DTA)]2-<[Mn(BCN-DTA)]2- highlighting the effect of the bridge length on the overall stability of the Mn(II) complexes. Remarkably, [Mn(BCN-DTA)]2- shows an improved pMn value and a 7-times higher kinetic inertness than [Mn(CDTA)]2-. NMR studies on the Zn(II) analogues confirm the rigidity of the bicyclic complexes with an isomerization process at >313 K for the smaller bridged complex [Zn(BCH-DTA)]2-.
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Affiliation(s)
- Jonathan Martinelli
- Department of Science and Technological Innovation, University of Piemonte Orientale, Viale Teresa Michel 11, 15121, Alessandria, Italy
- Department of Health Sciences (DISSAL), Università di Genova, Via A. Pastore 1, 16132, Genova, Italy
- Nuclear Medicine Unit, IRCCS Ospedale Policlinico San Martino, Largo R. Benzi 10, 16132, Genova, Italy
| | - Elisabetta Romano
- Department of Science and Technological Innovation, University of Piemonte Orientale, Viale Teresa Michel 11, 15121, Alessandria, Italy
| | - Attila Laczovics
- Faculty of Medicine, Institute of Medical Imaging, University of Debrecen, Nagyerdei körút 98, 4032, Debrecen, Hungary
| | - David Horváth
- Faculty of Science and Technology, Department of Physical Chemistry, Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, 4010, Debrecen, Hungary
- Bracco Imaging SpA, CRB Trieste, AREA Science Park, 34149, Basovizza (TS), Italy
| | - Elena Grattoni
- Bracco Imaging SpA, CRB Trieste, AREA Science Park, 34149, Basovizza (TS), Italy
- Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Trieste, Piazzale Europa 1, 34127, Trieste (TS), Italy
| | - Zsolt Baranyai
- Bracco Imaging SpA, CRB Trieste, AREA Science Park, 34149, Basovizza (TS), Italy
- Faculty of Science and Technology, Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, 4010, Debrecen, Hungary
| | - Lorenzo Tei
- Department of Science and Technological Innovation, University of Piemonte Orientale, Viale Teresa Michel 11, 15121, Alessandria, Italy
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3
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Toàn NM, Vágner A, Nagy G, Ország G, Nagy T, Csikos C, Váradi B, Sajtos GZ, Kapus I, Szoboszlai Z, Szikra D, Trencsényi G, Tircsó G, Garai I. [ 52Mn]Mn-BPPA-Trastuzumab: A Promising HER2-Specific PET Radiotracer. J Med Chem 2024; 67:8261-8270. [PMID: 38690886 DOI: 10.1021/acs.jmedchem.4c00344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2024]
Abstract
This study aimed to develop a novel radiotracer using trastuzumab and the long-lived [52Mn]Mn isotope for HER2-targeted therapy selection and monitoring. A new Mn(II) chelator, BPPA, synthesized from a rigid bispyclen platform possessing a picolinate pendant arm, formed a stable and inert Mn(II) complex with favorable relaxation properties. BPPA was converted into a bifunctional chelator (BFC), conjugated to trastuzumab, and labeled with [52Mn]Mn isotope. In comparison to DOTA-GA-trastuzumab, the BPPA-trastuzumab conjugate exhibits a labeling efficiency with [52Mn]Mn approximately 2 orders of magnitude higher. In female CB17 SCID mice bearing 4T1 (HER2-) and MDA-MB-HER2+ (HER2+) xenografts, [52Mn]Mn-BPPA-trastuzumab demonstrated superior uptake in HER2+ cells on day 3, with a 3-4 fold difference observed on day 7. Overall, the hexadentate BPPA chelator proves to be exceptional in binding Mn(II). Upon coupling with trastuzumab as a BFC ligand, it becomes an excellent imaging probe for HER2-positive tumors. [52Mn]Mn-BPPA-trastuzumab enables an extended imaging time window and earlier detection of HER2-positive tumors with superior tumor-to-background contrast.
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Affiliation(s)
- Ngô Minh Toàn
- Gyula Petrányi Doctoral School of Clinical Immunology and Allergology, Faculty of Medicine, University of Debrecen, Debrecen H-4032, Hungary
- Medical Imaging Clinic, Clinical Centre, University of Debrecen, Debrecen H-4032, Hungary
| | | | | | | | - Tamás Nagy
- Medical Imaging Clinic, Clinical Centre, University of Debrecen, Debrecen H-4032, Hungary
- Scanomed Ltd., Debrecen H-4032, Hungary
| | - Csaba Csikos
- Gyula Petrányi Doctoral School of Clinical Immunology and Allergology, Faculty of Medicine, University of Debrecen, Debrecen H-4032, Hungary
- Medical Imaging Clinic, Clinical Centre, University of Debrecen, Debrecen H-4032, Hungary
| | - Balázs Váradi
- Department of Physical Chemistry, Institute of Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen H-4032, Hungary
- Doctoral School of Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen H-4032, Hungary
| | - Gergő Zoltán Sajtos
- Department of Physical Chemistry, Institute of Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen H-4032, Hungary
- Doctoral School of Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen H-4032, Hungary
| | - István Kapus
- Department of Physical Chemistry, Institute of Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen H-4032, Hungary
- Doctoral School of Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen H-4032, Hungary
| | | | - Dezső Szikra
- Medical Imaging Clinic, Clinical Centre, University of Debrecen, Debrecen H-4032, Hungary
- Scanomed Ltd., Debrecen H-4032, Hungary
| | - György Trencsényi
- Gyula Petrányi Doctoral School of Clinical Immunology and Allergology, Faculty of Medicine, University of Debrecen, Debrecen H-4032, Hungary
- Medical Imaging Clinic, Clinical Centre, University of Debrecen, Debrecen H-4032, Hungary
- Scanomed Ltd., Debrecen H-4032, Hungary
| | - Gyula Tircsó
- Department of Physical Chemistry, Institute of Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen H-4032, Hungary
| | - Ildikó Garai
- Gyula Petrányi Doctoral School of Clinical Immunology and Allergology, Faculty of Medicine, University of Debrecen, Debrecen H-4032, Hungary
- Medical Imaging Clinic, Clinical Centre, University of Debrecen, Debrecen H-4032, Hungary
- Scanomed Ltd., Debrecen H-4032, Hungary
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4
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Jiang L, Cai Z, Cao Y, Fu S, Gu H, Zhu J, Cao W, Zhong L, Zhong J, Wu C, Wang K, Xia C, Lui S, Song B, Gong Q, Ai H. Facile Synthesis of Rigid Binuclear Manganese Complexes for Magnetic Resonance Angiography and SLC39A14-Mediated Hepatic Imaging. Bioconjug Chem 2024; 35:703-714. [PMID: 38708860 DOI: 10.1021/acs.bioconjchem.4c00185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/07/2024]
Abstract
Manganese(II)-based contrast agents (MBCAs) are potential candidates for gadolinium-free enhanced magnetic resonance imaging (MRI). In this work, a rigid binuclear MBCA (Mn2-PhDTA2) with a zero-length linker was developed via facile synthetic routes, while the other dimer (Mn2-TPA-PhDTA2) with a longer rigid linker was also synthesized via more complex steps. Although the molecular weight of Mn2-PhDTA2 is lower than that of Mn2-TPA-PhDTA2, their T1 relaxivities are similar, being increased by over 71% compared to the mononuclear Mn-PhDTA. In the presence of serum albumin, the relaxivity of Mn2-PhDTA2 was slightly lower than that of Mn2-TPA-PhDTA2, possibly due to the lower affinity constant. The transmetalation reaction with copper(II) ions confirmed that Mn2-PhDTA2 has an ideal kinetic inertness with a dissociation half-life of approximately 10.4 h under physiological conditions. In the variable-temperature 17O NMR study, both Mn-PhDTA and Mn2-PhDTA2 demonstrated a similar estimated q close to 1, indicating the formation of monohydrated complexes with each manganese(II) ion. In addition, Mn2-PhDTA2 demonstrated a superior contrast enhancement to Mn-PhDTA in in vivo vascular and hepatic MRI and can be rapidly cleared through a dual hepatic and renal excretion pattern. The hepatic uptake mechanism of Mn2-PhDTA2 mediated by SLC39A14 was validated in cellular uptake studies.
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Affiliation(s)
- Lingling Jiang
- National Engineering Research Center for Biomaterials, College of Biomedical Engineering, Sichuan University, Chengdu 610065, China
| | - Zhongyuan Cai
- National Engineering Research Center for Biomaterials, College of Biomedical Engineering, Sichuan University, Chengdu 610065, China
| | - Yingzi Cao
- National Engineering Research Center for Biomaterials, College of Biomedical Engineering, Sichuan University, Chengdu 610065, China
| | - Shengxiang Fu
- Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Haojie Gu
- National Engineering Research Center for Biomaterials, College of Biomedical Engineering, Sichuan University, Chengdu 610065, China
| | - Jiang Zhu
- Sichuan Key Laboratory of Medical Imaging, North Sichuan Medical College, Nanchong 637000, China
| | - Weidong Cao
- Sichuan Key Laboratory of Medical Imaging, North Sichuan Medical College, Nanchong 637000, China
| | - Lei Zhong
- Sichuan Key Laboratory of Medical Imaging, North Sichuan Medical College, Nanchong 637000, China
| | - Jie Zhong
- Sichuan Key Laboratory of Medical Imaging, North Sichuan Medical College, Nanchong 637000, China
| | - Changqiang Wu
- Sichuan Key Laboratory of Medical Imaging, North Sichuan Medical College, Nanchong 637000, China
| | - Kefeng Wang
- National Engineering Research Center for Biomaterials, College of Biomedical Engineering, Sichuan University, Chengdu 610065, 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, College of Biomedical Engineering, Sichuan University, Chengdu 610065, China
- Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China
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5
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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.
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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
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6
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Zhang Y, Xiang K, Pan J, Cheng R, Sun SK. Noninvasive Diagnosis of Kidney Dysfunction Using a Small-Molecule Manganese-Based Magnetic Resonance Imaging Probe. Anal Chem 2024; 96:3318-3328. [PMID: 38355404 DOI: 10.1021/acs.analchem.3c04069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2024]
Abstract
Contrast-enhanced magnetic resonance imaging (CE-MRI) is a promising approach for the diagnosis of kidney diseases. However, safety concerns, including nephrogenic systemic fibrosis, limit the administration of gadolinium (Gd)-based contrast agents (GBCAs) in patients who suffer from renal impairment. Meanwhile, nanomaterials meet biosafety concerns because of their long-term retention in the body. Herein, we propose a small-molecule manganese-based imaging probe Mn-PhDTA as an alternative to GBCAs to assess renal insufficiency for the first time. Mn-PhDTA was synthesized via a simple three-step reaction with a total yield of up to 33.6%, and a gram-scale synthesis can be realized. Mn-PhDTA has an r1 relaxivity of 2.72 mM-1 s-1 at 3.0 T and superior kinetic inertness over Gd-DTPA and Mn-EDTA with a dissociation time of 60 min in the presence of excess Zn2+. In vivo and in vitro experiments demonstrate their good stability and biocompatibility. In the unilateral ureteral obstruction rats, Mn-PhDTA provided significant MR signal enhancement, enabled distinguishing structure changes between the normal and damaged kidneys, and evaluated the renal function at different injured stages. Mn-PhDTA could act as a potential MRI contrast agent candidate for the replacement of GBCAs in the early detection of kidney dysfunction and analysis of kidney disease progression.
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Affiliation(s)
- Yuping Zhang
- School of Medical Imaging, Tianjin Medical University, Tianjin 300203, China
| | - Ke Xiang
- School of Medical Imaging, Tianjin Medical University, Tianjin 300203, China
| | - Jinbin Pan
- Department of Radiology and Tianjin Key Laboratory of Functional Imaging, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Ran Cheng
- School of Medical Imaging, Tianjin Medical University, Tianjin 300203, China
| | - Shao-Kai Sun
- School of Medical Imaging, Tianjin Medical University, Tianjin 300203, China
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7
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Keot N, Sarma M. Computational insight into a mechanistic overview of water exchange kinetics and thermodynamic stabilities of bis and tris-aquated complexes of lanthanides. RSC Adv 2023; 13:1516-1529. [PMID: 36688060 PMCID: PMC9816859 DOI: 10.1039/d2ra05810c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Accepted: 12/08/2022] [Indexed: 01/09/2023] Open
Abstract
A thorough investigation of Ln3+ complexes with more than one inner-sphere water molecule is crucial for designing high relaxivity contrast agents (CAs) used in magnetic resonance imaging (MRI). This study accomplished a comparative stability analysis of two hexadentate (H3cbda and H3dpaa) and two heptadentate (H4peada and H3tpaa) ligands with Ln3+ ions. The higher stability of the hexadentate H3cbda and heptadentate H4peada ligands has been confirmed by the binding affinity and Gibbs free energy analysis in aqueous solution. In addition, energy decomposition analysis (EDA) reveals the higher binding affinity of the peada4- ligand than the cbda3- ligand towards Ln3+ ions due to the higher charge density of the peada4- ligand. Moreover, a mechanistic overview of water exchange kinetics has been carried out based on the strength of the metal-water bond. The strength of the metal-water bond follows the trend Gd-O47 (w) > Gd-O39 (w) > Gd-O36 (w) in the case of the tris-aquated [Gd(cbda)(H2O)3] and Gd-O43 (w) > Gd-O40 (w) for the bis-aquated [Gd(peada)(H2O)2]- complex, which was confirmed by bond length, electron density (ρ), and electron localization function (ELF) at the corresponding bond critical points. Our analysis also predicts that the activation energy barrier decreases with the decrease in bond strength; hence k ex increases. The 17O and 1H hyperfine coupling constant values of all the coordinated water molecules were different, calculated by using the second-order Douglas-Kroll-Hess (DKH2) approach. Furthermore, the ionic nature of the bonding in the metal-ligand (M-L) bond was confirmed by the Quantum Theory of Atoms-In-Molecules (QTAIM) and ELF along with energy decomposition analysis (EDA). We hope that the results can be used as a basis for the design of highly efficient Gd(iii)-based high relaxivity MRI contrast agents for medical applications.
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Affiliation(s)
- Niharika Keot
- Department of Chemistry, Indian Institute of Technology GuwahatiAssam781039India+91 361 2582318
| | - Manabendra Sarma
- Department of Chemistry, Indian Institute of Technology GuwahatiAssam781039India+91 361 2582318
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8
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Ndiaye D, Cieslik P, Wadepohl H, Pallier A, Même S, Comba P, Tóth É. Mn 2+ Bispidine Complex Combining Exceptional Stability, Inertness, and MRI Efficiency. J Am Chem Soc 2022; 144:22212-22220. [PMID: 36445192 DOI: 10.1021/jacs.2c10108] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
As an essential metal ion and an efficient relaxation agent, Mn2+ holds a great promise to replace Gd3+ in magnetic resonance imaging (MRI) contrast agent applications, if its stable and inert complexation can be achieved. Toward this goal, four pyridine and one carboxylate pendants have been introduced in coordinating positions on the bispidine platform to yield ligand L3. Thanks to its rigid and preorganized structure and perfect size match for Mn2+, L3 provides remarkably high thermodynamic stability (log KMnL = 19.47), selectivity over the major biological competitor Zn2+ (log(KMnL/KZnL) = 4.4), and kinetic inertness. Solid-state X-ray data show that [MnL3(MeOH)](OTf)2 has an unusual eight-coordinate structure with a coordinated solvent molecule, in contrast to the six-coordinate structure of [ZnL3](OTf), underlining that the coordination cavity is perfectly adapted for Mn2+, while it is too large for Zn2+. In aqueous solution, 17O NMR data evidence one inner sphere water and dissociatively activated water exchange (kex298 = 13.5 × 107 s-1) for MnL3. Its water proton relaxivity (r1 = 4.44 mM-1 s-1 at 25 °C, 20 MHz) is about 30% higher than values for typical monohydrated Mn2+ complexes, which is related to its larger molecular size; its relaxation efficiency is similar to that of clinically used Gd3+-based agents. In vivo MRI experiments realized in control mice at 0.02 mmol/kg injected dose indicate good signal enhancement in the kidneys and fast renal clearance. Taken together, MnL3 is the first chelate that combines such excellent stability, selectivity, inertness and relaxation properties, all of primary importance for MRI use.
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Affiliation(s)
- Daouda Ndiaye
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d'Orléans, rue Charles Sadron, 45071 Orléans, France
| | - Patrick Cieslik
- Anorganisch-Chemisches Institut, Universität Heidelberg, INF 270, D-69120 Heidelberg, Germany
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut, Universität Heidelberg, INF 270, D-69120 Heidelberg, Germany
| | - Agnès Pallier
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d'Orléans, rue Charles Sadron, 45071 Orléans, France
| | - Sandra Même
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d'Orléans, rue Charles Sadron, 45071 Orléans, France
| | - Peter Comba
- Anorganisch-Chemisches Institut, Universität Heidelberg, INF 270, D-69120 Heidelberg, Germany.,Interdisciplinary Center for Scientific Computing, Universität Heidelberg, INF 205, D-69120 Heidelberg, Germany
| | - Éva Tóth
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d'Orléans, rue Charles Sadron, 45071 Orléans, France
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9
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Daksh S, Kaul A, Deep S, Datta A. Current advancement in the development of manganese complexes as magnetic resonance imaging probes. J Inorg Biochem 2022; 237:112018. [PMID: 36244313 DOI: 10.1016/j.jinorgbio.2022.112018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 09/14/2022] [Accepted: 09/28/2022] [Indexed: 01/18/2023]
Abstract
Emerging non-invasive molecular imaging modalities can detect a pathophysiological state at the molecular level before any anatomic changes are observed. Magnetic resonance imaging (MRI) is preferred over other nuclear imaging techniques owing to its radiation-free approach. Conventionally, most MRI contrast agents employed predominantly involve lanthanide metal: Gadolinium (Gd) until the discovery of associated severe nephrogenic toxicity issues. This limitation led a way to the development of manganese-based contrast agents which offer similar positive contrast enhancement capability. A vast quantity of experimental data has been accumulated over the last decade to define the physicochemical characteristics of manganese chelates with various ligand scaffolds. One can now observe how the ligand configurations, rigidity, and donor-acceptor characteristics impact the stability of the complex. This review covers the current trends in the development of manganese-based MRI contrast agents, the mechanisms they are based on and design considerations for newer manganese-based contrast agents with higher diagnostic strength along with better safety profiles.
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Affiliation(s)
- Shivani Daksh
- Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, Brig S. K. Mazumdar Marg, Delhi 110054, India; Department of Chemistry, Indian Institute of Technology, Hauz-Khas, New Delhi 110016, India
| | - Ankur Kaul
- Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, Brig S. K. Mazumdar Marg, Delhi 110054, India
| | - Shashank Deep
- Department of Chemistry, Indian Institute of Technology, Hauz-Khas, New Delhi 110016, India.
| | - Anupama Datta
- Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, Brig S. K. Mazumdar Marg, Delhi 110054, India.
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10
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Uzal-Varela R, Rodríguez-Rodríguez A, Wang H, Esteban-Gómez D, Brandariz I, Gale EM, Caravan P, Platas-Iglesias C. Prediction of Gd(III) complex thermodynamic stability. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214606] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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11
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Uzal-Varela R, Pérez-Fernández F, Valencia L, Rodríguez-Rodríguez A, Platas-Iglesias C, Caravan P, Esteban-Gómez D. Thermodynamic Stability of Mn(II) Complexes with Aminocarboxylate Ligands Analyzed Using Structural Descriptors. Inorg Chem 2022; 61:14173-14186. [PMID: 35994514 PMCID: PMC9455602 DOI: 10.1021/acs.inorgchem.2c02364] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
We present a quantitative analysis of the thermodynamic
stabilities
of Mn(II) complexes, defined by the equilibrium constants (log KMnL values) and the values of pMn obtained as
−log[Mn]free for total metal and ligand concentrations
of 1 and 10 μM, respectively. We used structural descriptors
to analyze the contributions to complex stability of different structural
motifs in a quantitative way. The experimental log KMnL and pMn values can be predicted to a good accuracy
by adding the contributions of the different motifs present in the
ligand structure. This allowed for the identification of features
that provide larger contributions to complex stability, which will
be very helpful for the design of efficient chelators for Mn(II) complexation.
This issue is particularly important to develop Mn(II) complexes for
medical applications, for instance, as magnetic resonance imaging
(MRI) contrast agents. The analysis performed here also indicates
that coordination number eight is more common for Mn(II) than is generally
assumed, with the highest log KMnL values generally observed for hepta- and octadentate ligands. The
X-ray crystal structure of [Mn2(DOTA)(H2O)2], in which eight-coordinate [Mn(DOTA)]2– units are bridged by six-coordinate exocyclic Mn(II) ions, is also
reported. We present empirical relationships
that allow estimating
the log K and pMn values of Mn(II) complexes
relevant as contrast agents for magnetic resonance imaging (MRI).
The prediction of complex stability with these expressions relies
on structural descriptors, providing a very powerful tool to aid with
ligand design.
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Affiliation(s)
- Rocío Uzal-Varela
- Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, Universidade da Coruña, 15071 A Coruña, Galicia, Spain
| | - Francisco Pérez-Fernández
- Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, Universidade da Coruña, 15071 A Coruña, Galicia, Spain
| | - Laura Valencia
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidade de Vigo, As Lagoas, Marcosende, 36310 Pontevedra, Spain
| | - Aurora Rodríguez-Rodríguez
- Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, Universidade da Coruña, 15071 A Coruña, Galicia, Spain
| | - Carlos Platas-Iglesias
- Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, Universidade da Coruña, 15071 A Coruña, Galicia, Spain
| | - Peter Caravan
- The Institute for Innovation in Imaging and the A. A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, 149, 13th Street, Suite 2301, Charlestown, Massachusetts 02129, United States
| | - David Esteban-Gómez
- Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, Universidade da Coruña, 15071 A Coruña, Galicia, Spain
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12
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Váradi B, Lihi N, Bunda S, Nagy A, Simon G, Kéri M, Papp G, Tircsó G, Esteban-Gómez D, Platas-Iglesias C, Kálmán FK. Physico-Chemical Characterization of a Highly Rigid Gd(III) Complex Formed with a Phenanthroline Derivative Ligand. Inorg Chem 2022; 61:13497-13509. [PMID: 35972786 DOI: 10.1021/acs.inorgchem.2c02050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The discovery of the nephrogenic systemic fibrosis (NSF) and its link with the in vivo dissociation of certain Gd(III)-based contrast agents (CAs) applied in the magnetic resonance imaging (MRI) induced a still growing research to replace the compromised agents with safer alternatives. In recent years, several ligands were designed to exploit the luminescence properties of the lanthanides, containing structurally constrained aromatic moieties, which may form rigid Gd(III) complexes. One of these ligands is (1,10-phenanthroline-2,9-diyl)bis(methyliminodiacetic acid) (H4FENTA) designed and synthesized to sensitize Eu(III) and Tb(III) luminescence. Our results show that the conditional stability of the [Gd(FENTA)]- chelate calculated for physiological pH (pGd = 19.7) is similar to those determined for [Gd(DTPA)]2- (pGd = 19.4) and [Gd(DOTA)]- (pGd = 20.1), routinely used in the clinical practice. The [Gd(FENTA)]- complex is remarkably inert with respect to its dissociation (t1/2 = 872 days at pH = 7 and 25 °C); furthermore, its relaxivity values determined at different field strengths and temperatures (e.g., r1p = 4.3 mM-1s-1at 60 MHz and 37 °C) are ca. one unit higher than those of [Gd(DTPA)]2- (r1p = 3.4 mM-1 s-1) and [Gd(DOTA)]- (r1p = 3.1 mM-1 s-1) under the same conditions. Moreover, significant improvement on the relaxivity was observed in the presence of serum proteins (r1p = 6.9 mM-1 s-1 at 60 MHz and 37 °C). The luminescence lifetimes recorded in H2O and D2O solutions indicate the presence of a water molecule (q = 1) in the inner sphere of the complex directly coordinated to the metal ion, possessing a relatively high water exchange rate (kex298 = 29(2) × 106 s-1). The acceleration of the water exchange can be explained by the steric compression around the water binding site due to the rigid structure of the complex, which was supported by DFT calculations. On the basis of these results, ligands containing a phenanthroline platform have great potential in the design of safer Gd(III) agents for MRI.
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Affiliation(s)
- Balázs Váradi
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen H-4032, Hungary.,Doctoral School of Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, Debrecen H-4032, Hungary
| | - Norbert Lihi
- ELKH-DE Mechanisms of Complex Homogeneous and Heterogeneous Chemical Reactions Research Group, Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen H-4032, Hungary
| | - Szilvia Bunda
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen H-4032, Hungary
| | - Antónia Nagy
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen H-4032, Hungary
| | - Gréta Simon
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen H-4032, Hungary
| | - Mónika Kéri
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen H-4032, Hungary
| | - Gábor Papp
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen H-4032, Hungary
| | - Gyula Tircsó
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen H-4032, Hungary
| | - David Esteban-Gómez
- Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, Univer-sidade da Coruña, A Coruña, Galicia 15071, Spain
| | - Carlos Platas-Iglesias
- Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, Univer-sidade da Coruña, A Coruña, Galicia 15071, Spain
| | - Ferenc K Kálmán
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen H-4032, Hungary
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13
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Csupász T, Szücs D, Kálmán FK, Hollóczki O, Fekete A, Szikra D, Tóth É, Tóth I, Tircsó G. A New Oxygen Containing Pyclen-Type Ligand as a Manganese(II) Binder for MRI and 52Mn PET Applications: Equilibrium, Kinetic, Relaxometric, Structural and Radiochemical Studies. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27020371. [PMID: 35056686 PMCID: PMC8778187 DOI: 10.3390/molecules27020371] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Revised: 12/29/2021] [Accepted: 12/30/2021] [Indexed: 11/16/2022]
Abstract
A new pyclen-3,9-diacetate derivative ligand (H23,9-OPC2A) was synthesized possessing an etheric O-atom opposite to the pyridine ring, to improve the dissociation kinetics of its Mn(II) complex (pyclen = 3,6,9,15-tetraazabicyclo(9.3.1)pentadeca-1(15),11,13-triene). The new ligand is less basic than the N-containing analogue (H23,9-PC2A) due to the non-protonable O-atom. In spite of its lower basicity, the conditional stability of the [Mn(3,9-OPC2A)] (pMn = −log(Mn(II)), cL = cMn(II) = 0.01 mM. pH = 7.4) remains unaffected (pMn = 8.69), compared to the [Mn(3,9-PC2A)] (pMn = 8.64). The [Mn(3,9-OPC2A)] possesses one water molecule, having a lower exchange rate with bulk solvents (kex298 = 5.3 ± 0.4 × 107 s−1) than [Mn(3,9-PC2A)] (kex298 = 1.26 × 108 s−1). These mild differences are rationalized by density-functional theory (DFT) calculations. The acid assisted dissociation of [Mn(3,9-OPC2A)] is considerably slower (k1 = 2.81 ± 0.07 M−1 s−1) than that of the complexes of diacetates or bisamides of various 12-membered macrocycles and the parent H23,9-PC2A. The [Mn(3,9-OPC2A)] is inert in rat/human serum as confirmed by 52Mn labeling (nM range), as well as by relaxometry (mM range). However, a 600-fold excess of EDTA (pH = 7.4) or a mixture of essential metal ions, propagated some transchelation/transmetalation in 7 days. The H23,9-OPC2A is labeled efficiently with 52Mn at elevated temperatures, yet at 37 °C the parent H23,9-PC2A performs slightly better. Ultimately, the H23,9-OPC2A shows advantageous features for further ligand designs for bifunctional chelators.
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Affiliation(s)
- Tibor Csupász
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (T.C.); (D.S.); (F.K.K.); (O.H.); (I.T.)
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Dániel Szücs
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (T.C.); (D.S.); (F.K.K.); (O.H.); (I.T.)
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
- Department of Medical Imaging, Division of Nuclear Medicine, Faculty of Medicine, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (A.F.); (D.S.)
| | - Ferenc Krisztián Kálmán
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (T.C.); (D.S.); (F.K.K.); (O.H.); (I.T.)
| | - Oldamur Hollóczki
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (T.C.); (D.S.); (F.K.K.); (O.H.); (I.T.)
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstr. 4+6, D-53115 Bonn, Germany
| | - Anikó Fekete
- Department of Medical Imaging, Division of Nuclear Medicine, Faculty of Medicine, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (A.F.); (D.S.)
| | - Dezső Szikra
- Department of Medical Imaging, Division of Nuclear Medicine, Faculty of Medicine, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (A.F.); (D.S.)
| | - Éva Tóth
- Centre de Biophysique Moléculaire, CNRS, Rue Charles Sadron, CEDEX 2, 45071 Orléans, France;
| | - Imre Tóth
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (T.C.); (D.S.); (F.K.K.); (O.H.); (I.T.)
| | - Gyula Tircsó
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (T.C.); (D.S.); (F.K.K.); (O.H.); (I.T.)
- Correspondence: ; Tel.: +36-52-512-900 (ext. 22374)
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14
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Botár R, Molnár E, Garda Z, Madarasi E, Trencsényi G, Kiss J, Kálmán FK, Tircsó G. Synthesis and characterization of a stable and inert MnII-based ZnII responsive MRI probe for molecular imaging of glucose stimulated zinc secretion (GSZS). Inorg Chem Front 2022. [DOI: 10.1039/d1qi00501d] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A ZnII responsive MnII-based MRI contrast agent, [Mn(PC2A-DPA)], has been synthesized, investigated and applied in imaging studies. It shows high stability and excellent inertness and can be used to visualize glucose triggered ZnII release by MRI.
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Affiliation(s)
- Richárd Botár
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Egyetem tér 1, Hungary
- Doctoral School of Chemistry, University of Debrecen, H-4032 Debrecen, Egyetem tér 1, Hungary
| | - Enikő Molnár
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Egyetem tér 1, Hungary
| | - Zoltán Garda
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Egyetem tér 1, Hungary
| | - Enikő Madarasi
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Egyetem tér 1, Hungary
- Doctoral School of Chemistry, University of Debrecen, H-4032 Debrecen, Egyetem tér 1, Hungary
| | - György Trencsényi
- Department of Medical Imaging, Division of Nuclear Medicine, Faculty of Medicine, University of Debrecen, H-4032 Debrecen, Egyetem tér 1, Hungary
| | - János Kiss
- Department of Medical Imaging, Division of Nuclear Medicine, Faculty of Medicine, University of Debrecen, H-4032 Debrecen, Egyetem tér 1, Hungary
| | - Ferenc K. Kálmán
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Egyetem tér 1, Hungary
| | - Gyula Tircsó
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Egyetem tér 1, Hungary
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15
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Mallik R, Saha M, Mukherjee C. Porous Silica Nanospheres with a Confined Mono(aquated) Mn(II)-Complex: A Potential T1- T2 Dual Contrast Agent for Magnetic Resonance Imaging. ACS APPLIED BIO MATERIALS 2021; 4:8356-8367. [PMID: 35005912 DOI: 10.1021/acsabm.1c00937] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Magnetic resonance imaging has emerged as an indispensable imaging modality for the early-stage diagnosis of many diseases. The imaging in the presence of a contrast agent is always advantageous, as it mitigates the low-sensitivity issue of the measurements and provides excellent contrast in the acquired images even in a short acquisition time. However, the stability and high relaxivity of the contrast agents remained a challenge. Here, molecules of a mononuclear, mono(aquated), thermodynamically stable [log KMnL = 14.80(7) and pMn = 8.97] Mn(II)-complex (1), based on a hexadentate pyridine-picolinate unit-containing ligand (H2PyDPA), were confined within a porous silica nanosphere in a noncovalent fashion to render a stable nanosystem, complex 1@SiO2NP. The entrapped complex 1 (complex 1@SiO2) exhibited r1 = 8.46 mM-1 s-1 and r2 = 33.15 mM-1 s-1 at pH = 7.4, 25 °C, and 1.41 T in N-(2-hydroxyethyl)piperazine-N'-ethanesulfonic acid buffer. The values were about 2.9 times higher compared to the free (unentrapped)-complex 1 molecules. The synthesized complex 1@SiO2NP interacted significantly with albumin protein and consequently boosted both the relaxivity values to r1 = 24.76 mM-1 s-1 and r2 = 63.96 mM-1 s-1 at pH = 7.4, 37 °C, and 1.41 T. The kinetic inertness of the entrapped molecules was established by recognizing no appreciable change in the r1 value upon challenging complex 1@SiO2NP with 30 and 40 times excess of Zn(II) ions at pH 6 and 25 °C. The water molecule coordinated to the Mn(II) ion in complex 1@SiO2 was also impervious to the physiologically relevant anions (bicarbonate, biphosphate, and citrate) and pH of the medium. Thus, it ensured the availability of the inner-coordination site of complex 1 for the coordination of water molecules in the biological media. The concentration-dependent changes in image intensities in T1- and T2-weighted phantom images and uptake of the nanoparticles by the HeLa cell put forward the biocompatible complex 1@SiO2NP as a potential dual-mode MRI contrast agent, an alternative to Gd(III)-containing contrast agents.
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Affiliation(s)
- Riya Mallik
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Muktashree Saha
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Chandan Mukherjee
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
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16
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Uzal-Varela R, Lalli D, Brandariz I, Rodríguez-Rodríguez A, Platas-Iglesias C, Botta M, Esteban-Gómez D. Rigid versions of PDTA 4- incorporating a 1,3-diaminocyclobutyl spacer for Mn 2+ complexation: stability, water exchange dynamics and relaxivity. Dalton Trans 2021; 50:16290-16303. [PMID: 34730583 DOI: 10.1039/d1dt02498a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Rigid derivatives of the acyclic ligand PDTA4- (H4PDTA = propylenediamine-N,N,N',N'-tetraacetic acid) were prepared by functionalization of a 1,3-diaminocyclobutyl spacer. The new ligands contain either four acetate groups attached to the central scaffold (H4L1) or incorporate pyridyl (H2L2) or propylamide (H2L3) units replacing two of the carboxylate groups. The ligand protonation constants and the stability constants of their Mn2+ complexes were determined using potentiometric and spectrophotometric titrations. The stability of the [Mn(L1)]2- complex was found to be significantly higher than that of the flexible [Mn(PDTA)]2- derivative (log KMnL = 10.78 and 10.01, respectively). A detailed study of the 1H Nuclear Magnetic Relaxation Dispersion (NMRD) profiles and 17O NMR measurements evidence that the [Mn(L1)]2- and [Mn(L2)] complexes display a hydration equilibrium in solution involving a seven-coordinate species with an inner-sphere water molecule and a six-coordinate species that lacks a coordinated water molecule. As a result the 1H relaxivities of these complexes are somewhat lower than that of [Mn(EDTA)]2- and related systems. The introduction of propylamide groups in [Mn(L3)] shifts the hydration equilibrium to the seven-coordinate species, which results in a 1H relaxivity (r1p = 3.7 mM-1 s-1 at 22 MHz and 25 °C) exceeding that of [Mn(EDTA)]2- (r1p = 3.3 mM-1 s-1 at 22 MHz and 25 °C). The parameters that control the relaxivities in this family of complexes were determined by simultaneous fitting of the experimental 1H NMRD and 17O NMR data (transverse relaxation rates and chemical shifts), with the aid of computational studies performed at the DFT and CASSCF/NEVPT2 levels. These studies provide detailed insight of the parameters that control the efficiency of these relaxation agents at the molecular level.
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Affiliation(s)
- Rocío Uzal-Varela
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Daniela Lalli
- Magnetic Resonance Platform (PRISMA-UPO), Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy
| | - Isabel Brandariz
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Aurora Rodríguez-Rodríguez
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Carlos Platas-Iglesias
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Mauro Botta
- Magnetic Resonance Platform (PRISMA-UPO), Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy
| | - David Esteban-Gómez
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
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17
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Baranyai Z, Carniato F, Nucera A, Horváth D, Tei L, Platas-Iglesias C, Botta M. Defining the conditions for the development of the emerging class of Fe III-based MRI contrast agents. Chem Sci 2021; 12:11138-11145. [PMID: 34522311 PMCID: PMC8386674 DOI: 10.1039/d1sc02200h] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 07/07/2021] [Indexed: 02/05/2023] Open
Abstract
Fe(iii) complexes are attracting growing interest in chemists developing diagnostic probes for Magnetic Resonance Imaging because they leverage on an endogenous metal and show superior stability. However, in this case a detailed understanding of the relationship between the chemical structure of the complexes, their magnetic, thermodynamic, kinetic and redox properties and the molecular parameters governing the efficacy (relaxivity) is still far from being available. We have carried out an integrated 1H and 17O NMR relaxometric study as a function of temperature and magnetic field, on the aqua ion and three complexes chosen as reference models, together with theoretical calculations, to obtain accurate values of the parameters that control their relaxivity. Moreover, thermodynamic stability and dissociation kinetics of the Fe(iii) chelates, measured in association with the ascorbate reduction behaviour, highlight their role and mutual influence in achieving the stability required for use in vivo. An integrated 1H and 17O NMR relaxometric study on model systems allowed to highlight that the Fe(III) complexes might represent the best alternative to Gd-based MRI contrast agents at the magnetic fields of current and future clinical scanners.![]()
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Affiliation(s)
- Zsolt Baranyai
- Bracco Research Centre, Bracco Imaging S.p.A. Via Ribes 5 10010 Colleretto Giacosa Italy
| | - Fabio Carniato
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro" Viale T. Michel 11 15121 Alessandria Italy
| | - Alessandro Nucera
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro" Viale T. Michel 11 15121 Alessandria Italy
| | - Dávid Horváth
- Bracco Research Centre, Bracco Imaging S.p.A. Via Ribes 5 10010 Colleretto Giacosa Italy.,Department of Physical Chemistry, University of Debrecen Egyetem tér 1. H-4010 Debrecen Hungary
| | - Lorenzo Tei
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro" Viale T. Michel 11 15121 Alessandria Italy
| | - Carlos Platas-Iglesias
- Centro de Investigacións Científicas Avanzadas (CICA), Departamento de Química, Facultade de Ciencias, Universidade da Coruña 15071 A Coruña Galicia Spain
| | - Mauro Botta
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro" Viale T. Michel 11 15121 Alessandria Italy
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18
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Chirayil S, Jordan VC, Martins AF, Paranawithana N, Ratnakar SJ, Sherry AD. Manganese(II)-Based Responsive Contrast Agent Detects Glucose-Stimulated Zinc Secretion from the Mouse Pancreas and Prostate by MRI. Inorg Chem 2021; 60:2168-2177. [PMID: 33507742 PMCID: PMC8112388 DOI: 10.1021/acs.inorgchem.0c02688] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A Mn(II)-based zinc-sensitive MRI contrast agent, MnPyC3A-BPEN, was prepared, characterized, and applied in imaging experiments to detect glucose-stimulated zinc secretion (GSZS) from the mouse pancreas and prostate in vivo. Thermodynamic and kinetic stability tests showed that MnPyC3A-BPEN has superior kinetic inertness compared to GdDTPA, is less susceptible to transmetalation in the presence of excess Zn2+ ions, and less susceptible to transchelation by albumin. In comparison with other gadolinium-based zinc sensors bearing a single zinc binding moiety, MnPyC3A-BPEN appears to be a reliable alternative for imaging β-cell function in the pancreas and glucose-stimulated zinc secretion from the prostate.
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Affiliation(s)
- Sara Chirayil
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
| | - Veronica Clavijo Jordan
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts 02129, United States
| | - André F Martins
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
- Werner Siemens Imaging Center, Eberhard Karls University Tübingen, Tübingen 72076, Germany
- Cluster of Excellence iFIT (EXC 2180) "Image-Guided and Functionally Instructed Tumor Therapies", University of Tübingen, Tübingen 72076, Germany
- Department of Chemistry, University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Namini Paranawithana
- Department of Chemistry, University of Texas at Dallas, Richardson, Texas 75080, United States
| | - S James Ratnakar
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
| | - A Dean Sherry
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
- Department of Chemistry, University of Texas at Dallas, Richardson, Texas 75080, United States
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19
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Porcar-Tost O, Pallier A, Esteban-Gómez D, Illa O, Platas-Iglesias C, Tóth É, Ortuño RM. Stability, relaxometric and computational studies on Mn 2+ complexes with ligands containing a cyclobutane scaffold. Dalton Trans 2021; 50:1076-1085. [PMID: 33367361 DOI: 10.1039/d0dt03402a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The stability constants of Mn2+ complexes with ligands containing a trans-1,2-cyclobutanediamine spacer functionalized with picolinate and/or carboxylate functions were determined using potentiometric titrations (25 °C, 0.1 M KCl). The stability constant of the complex with a hexadentate ligand containing four acetate groups (L14-, log KMnL = 10.26) is improved upon replacing one (L24-, log KMnL = 14.71) or two (L34-, log KMnL = 15.81) carboxylate groups with picolinates. The [Mn(L1)]2- complex contains a water molecule coordinated to the metal ion in aqueous solutions, as evidenced by 1H NMRD studies and 17O chemical shifts and transverse relaxation rates. The 1H relaxivities determined at 60 MHz (3.3 and 2.4 mM-1 s-1 at 25 and 37 °C, respectively) are comparable to those of monohydrated complexes such as [Mn(edta)]2-. The exchange rate of the inner-sphere water molecule (k = 248 × 106 s-1) is slightly lower than that of the edta4- analogue. DFT calculations (M11/def2-TZVP) suggest that the water exchange reaction follows a dissociatively activated mechanism, providing activation parameters in reasonably good agreement with the experimental data. DFT calculations also show that the 17O hyperfine coupling constant A/ℏ is affected slightly by changes in the Mn-Owater distance and the orientation of the water molecule with respect to the Mn-O vector.
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Affiliation(s)
- Oriol Porcar-Tost
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain.
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20
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Garda Z, Molnár E, Hamon N, Barriada JL, Esteban-Gómez D, Váradi B, Nagy V, Pota K, Kálmán FK, Tóth I, Lihi N, Platas-Iglesias C, Tóth É, Tripier R, Tircsó G. Complexation of Mn(II) by Rigid Pyclen Diacetates: Equilibrium, Kinetic, Relaxometric, Density Functional Theory, and Superoxide Dismutase Activity Studies. Inorg Chem 2020; 60:1133-1148. [PMID: 33378171 DOI: 10.1021/acs.inorgchem.0c03276] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
We report the Mn(II) complexes with two pyclen-based ligands (pyclen = 3,6,9,15-tetraazabicyclo[9.3.1]pentadeca-1(15),11,13-triene) functionalized with acetate pendant arms at either positions 3,6 (3,6-PC2A) or 3,9 (3,9-PC2A) of the macrocyclic fragment. The 3,6-PC2A ligand was synthesized in five steps from pyclen oxalate by protecting one of the secondary amine groups of pyclen using Alloc protecting chemistry. The complex with 3,9-PC2A is characterized by a higher thermodynamic stability [log KMnL = 17.09(2)] than the 3,6-PC2A analogue [log KMnL = 15.53(1); 0.15 M NaCl]. Both complexes contain a water molecule coordinated to the metal ion, which results in relatively high 1H relaxivities (r1p = 2.72 and 2.91 mM-1 s-1 for the complexes with 3,6-PC2A and 3,9-PC2A, respectively, at 25 °C and 0.49 T). The coordinated water molecule displays fast exchange kinetics with the bulk in both cases; the rates (kex298) are 140 × 106 and 126 × 106 s-1 for [Mn(3,6-PC2A)(H2O)] and [Mn(3,9-PC2A)(H2O)], respectively. The two complexes were found to be remarkably inert with respect to their dissociation, with half-lives of 63 and 21 h, respectively, at pH = 7.4 in the presence of excess Cu(II). The r1p values recorded in blood serum remain constant at least over a period of 120 h. Cyclic voltammetry experiments show irreversible oxidation features shifted to higher potentials with respect to [Mn(EDTA)(H2O)]2- (H4EDTA = ethylenediaminetetraacetic acid) and [Mn(PhDTA)(H2O)]2- (H4PhDTA = phenylenediamine-N,N,N',N'-tetraacetic acid), indicating that the PC2A complexes reported here have a lower tendency to stabilize Mn(III). The superoxide dismutase activity of the Mn(II) complexes was tested using the xanthine/xanthine oxidase/p-nitro blue tetrazolium chloride assay at pH = 7.8. The Mn(II) complexes of 3,6-PC2A and 3,9-PC2A are capable of assisting decomposition of the superoxide anion radical. The kinetic rate constant of the complex of 3,9-PC2A is smaller by 1 order of magnitude than that of 3,6-PC2A.
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Affiliation(s)
| | | | - Nadège Hamon
- Université Brest, UMR-CNRS 6521, CEMCA, 6 avenue Victor le Gorgeu, 29238 Brest, France
| | - José Luis Barriada
- Centro de Investigacións Científicas Avanzadas and Departamento de Química, Universidade da Coruña, Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - David Esteban-Gómez
- Centro de Investigacións Científicas Avanzadas and Departamento de Química, Universidade da Coruña, Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Balázs Váradi
- Doctoral School of Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | | | | | | | | | | | - Carlos Platas-Iglesias
- Centro de Investigacións Científicas Avanzadas and Departamento de Química, Universidade da Coruña, Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Éva Tóth
- Centre de Biophysique Moléculaire, CNRS, rue Charles Sadron, 45071 Orléans, Cedex 2, France
| | - Raphaël Tripier
- Université Brest, UMR-CNRS 6521, CEMCA, 6 avenue Victor le Gorgeu, 29238 Brest, France
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21
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Pota K, Molnár E, Kálmán FK, Freire DM, Tircsó G, Green KN. Manganese Complex of a Rigidified 15-Membered Macrocycle: A Comprehensive Study. Inorg Chem 2020; 59:11366-11376. [PMID: 32709206 DOI: 10.1021/acs.inorgchem.0c01053] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Owing to the increasing importance of manganese(II) complexes in the field of magnetic resonance imaging (MRI), large efforts have been devoted to find an appropriate ligand for Mn(II) ion encapsulation by providing balance between the seemingly contradictory requirements (i.e., thermodynamic stability and kinetic inertness vs low ligand denticity enabling water molecule(s) to be coordinated in its metal center). Among these ligands, a large number of pyridine or pyridol based open-chain and macrocyclic chelators have been investigated so far. As a next step in the development of these chelators, 15-pyN3O2Ph and its transition metal complexes were synthesized and characterized using established methods. The 15-pyN3O2Ph ligand incorporates both pyridine and ortho-phenylene units to decrease ligand flexibility. The thermodynamic properties, protonation and stability constants, were determined using pH-potentiometry; the solid-state structures of two protonation states of the free ligand and its manganese complex were obtained by single crystal X-ray diffractometry. The results show a seven-coordinate metal center with two water molecules in the first coordination sphere. The longitudinal relaxivity of [Mn(15-pyN3O2Ph)]2+ was found to be 5.16 mM-1 s-1 at 0.49 T (298 K). Furthermore, the r2p value of 11.72 mM-1 s-1 (0.49 T), which is doubled at 1.41 T field, suggests that design of this Mn(II) complex does achieve some characteristics required for contrast imaging. In addition, 17O NMR measurements were performed in order to access the microscopic parameters governing this key feature (e.g., water exchange rate). Finally, manganese complexes of ligands with analogous polyaza macrocyclic scaffold have been investigated as low molecular weight Mn(CAT) mimics. Here, we report the H2O2 disproportionation study of [Mn(15-pyN3O2Ph)]2+ to demonstrate the versatility of this ligand scaffold as well.
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Affiliation(s)
- Kristof Pota
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 S. Bowie, Fort Worth, Texas 76129, United States
| | - Enikő Molnár
- Department of Physical Chemistry, University of Debrecen, Egyetem tér 1., Debrecen, Hungary H-4032
| | - Ferenc Krisztián Kálmán
- Department of Physical Chemistry, University of Debrecen, Egyetem tér 1., Debrecen, Hungary H-4032
| | - David M Freire
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 S. Bowie, Fort Worth, Texas 76129, United States
| | - Gyula Tircsó
- Department of Physical Chemistry, University of Debrecen, Egyetem tér 1., Debrecen, Hungary H-4032
| | - Kayla N Green
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 S. Bowie, Fort Worth, Texas 76129, United States
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22
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Kálmán FK, Nagy V, Váradi B, Garda Z, Molnár E, Trencsényi G, Kiss J, Même S, Même W, Tóth É, Tircsó G. Mn(II)-Based MRI Contrast Agent Candidate for Vascular Imaging. J Med Chem 2020; 63:6057-6065. [DOI: 10.1021/acs.jmedchem.0c00197] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Ferenc K. Kálmán
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
- Le Studium, Loire Valley Institute for Advanced Studies, 1 Rue Dupanloup, 45000 Orléans, France
| | - Viktória Nagy
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Balázs Váradi
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Zoltán Garda
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Enikő Molnár
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - György Trencsényi
- Division of Nuclear Medicine, Department of Medical Imaging, Faculty of Medicine, University of Debrecen, H-4032 Debrecen, Hungary
| | - János Kiss
- Division of Nuclear Medicine, Department of Medical Imaging, Faculty of Medicine, University of Debrecen, H-4032 Debrecen, Hungary
| | - Sandra Même
- Centre de Biophysique Moléculaire, CNRS-UPR 4301, Université d’Orléans, Rue Charles Sadron, CS 80054, 45071 Orléans, France
| | - William Même
- Centre de Biophysique Moléculaire, CNRS-UPR 4301, Université d’Orléans, Rue Charles Sadron, CS 80054, 45071 Orléans, France
| | - Éva Tóth
- Centre de Biophysique Moléculaire, CNRS-UPR 4301, Université d’Orléans, Rue Charles Sadron, CS 80054, 45071 Orléans, France
| | - Gyula Tircsó
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
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23
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Gupta A, Caravan P, Price WS, Platas-Iglesias C, Gale EM. Applications for Transition-Metal Chemistry in Contrast-Enhanced Magnetic Resonance Imaging. Inorg Chem 2020; 59:6648-6678. [PMID: 32367714 DOI: 10.1021/acs.inorgchem.0c00510] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Contrast-enhanced magnetic resonance imaging (MRI) is an indispensable tool for diagnostic medicine. However, safety concerns related to gadolinium in commercial MRI contrast agents have emerged in recent years. For patients suffering from severe renal impairment, there is an important unmet medical need to perform contrast-enhanced MRI without gadolinium. There are also concerns over the long-term effects of retained gadolinium within the general patient population. Demand for gadolinium-free MRI contrast agents is driving a new wave of inorganic chemistry innovation as researchers explore paramagnetic transition-metal complexes as potential alternatives. Furthermore, advances in personalized care making use of molecular-level information have motivated inorganic chemists to develop MRI contrast agents that can detect pathologic changes at the molecular level. Recent studies have highlighted how reaction-based modulation of transition-metal paramagnetism offers a highly effective mechanism to achieve MRI contrast enhancement that is specific to biochemical processes. This Viewpoint highlights how recent advances in transition-metal chemistry are leading the way for a new generation of MRI contrast agents.
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Affiliation(s)
- Abhishek Gupta
- Nanoscale Organisation and Dynamics Group, School of Science and Health, Western Sydney University, Penrith, New South Wales 2751, Australia.,Ingham Institute of Applied Medical Research, Liverpool, New South Wales 2170, Australia
| | | | - William S Price
- Nanoscale Organisation and Dynamics Group, School of Science and Health, Western Sydney University, Penrith, New South Wales 2751, Australia.,Ingham Institute of Applied Medical Research, Liverpool, New South Wales 2170, Australia
| | - Carlos Platas-Iglesias
- Centro de Investigacións Científicas Avanzadas and Departamento de Química, Facultade de Ciencias, Universidade da Coruña, A Coruña, Galicia 15071, Spain
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24
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Freire DM, Beeri D, Pota K, Johnston HM, Palacios P, Pierce BS, Sherman BD, Green KN. Hydrogen Peroxide Disproportionation with Manganese Macrocyclic Complexes of Cyclen and Pyclen. Inorg Chem Front 2020; 7:1573-1582. [PMID: 32457818 DOI: 10.1039/c9qi01509d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The catalase family of enzymes, which include a variety with a binuclear manganese active site, mitigate the risk from reactive oxygen species by facilitating the disproportionation of hydrogen peroxide into molecular oxygen and water. In this work, hydrogen peroxide disproportionation using complexes formed between manganese and cyclen or pyclen were investigated due to the spectroscopic similarities with the native MnCAT enzyme. Potentiometric titrations were used to construct speciation diagrams that identify the manganese complex compositions at different pH values. Each complex behaves as a functional mimic of catalase enzymes. UV-visible spectroscopic investigations of the H2O2 decomposition reaction yielded information about the structure of the initial catalyst and intermediates that include monomeric and dimeric species. The results indicate that rigidity imparted by the pyridine ring of pyclen is a key factor in increased TON and TOF values measured compared to cyclen.
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Affiliation(s)
- David M Freire
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 W.Bowie, Fort Worth, TX 76129, United States
| | - Debora Beeri
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 W.Bowie, Fort Worth, TX 76129, United States
| | - Kristof Pota
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 W.Bowie, Fort Worth, TX 76129, United States
| | - Hannah M Johnston
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 W.Bowie, Fort Worth, TX 76129, United States
| | - Philip Palacios
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, 700 Planetarium Place, Arlington, TX 76019
| | - Brad S Pierce
- Department of Chemistry and Biochemistry, University of Alabama, 250 Hackberry Lane, Box 870336 Tuscaloosa, AL 35487
| | - Benjamin D Sherman
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 W.Bowie, Fort Worth, TX 76129, United States
| | - Kayla N Green
- Department of Chemistry and Biochemistry, Texas Christian University, 2950 W.Bowie, Fort Worth, TX 76129, United States
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25
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Botár R, Molnár E, Trencsényi G, Kiss J, Kálmán FK, Tircsó G. Stable and Inert Mn(II)-Based and pH-Responsive Contrast Agents. J Am Chem Soc 2020; 142:1662-1666. [DOI: 10.1021/jacs.9b09407] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Richárd Botár
- Department of Physical Chemistry, University of Debrecen, H-4032 Debrecen, Hungary
| | - Enikő Molnár
- Department of Physical Chemistry, University of Debrecen, H-4032 Debrecen, Hungary
| | - György Trencsényi
- Division of Nuclear Medicine, Department of Medical Imaging, Faculty of Medicine, University of Debrecen, H-4032 Debrecen, Hungary
| | - János Kiss
- Division of Nuclear Medicine, Department of Medical Imaging, Faculty of Medicine, University of Debrecen, H-4032 Debrecen, Hungary
- Mediso Ltd., H-4032 Debrecen, Hungary
| | - Ferenc K. Kálmán
- Department of Physical Chemistry, University of Debrecen, H-4032 Debrecen, Hungary
| | - Gyula Tircsó
- Department of Physical Chemistry, University of Debrecen, H-4032 Debrecen, Hungary
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26
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Kripli B, Garda Z, Sólyom B, Tircsó G, Kaizer J. Formation, stability and catalase-like activity of mononuclear manganese( ii) and oxomanganese( iv) complexes in protic and aprotic solvents. NEW J CHEM 2020. [DOI: 10.1039/c9nj06004a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Catalytic and stoichiometric H2O2oxidation by [MnII(N4Py*)]2+and [MnIV(N4Py*)(O)]2+complexes as catalase mimics have been carried out.
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Affiliation(s)
- Balázs Kripli
- Department of Chemistry
- University of Pannonia
- 8201 Veszprém
- Hungary
| | - Zoltán Garda
- Department of Physical Chemistry
- Faculty of Science and Technology
- University of Debrecen
- Debrecen
- Hungary
| | - Bernadett Sólyom
- Department of Chemistry
- University of Pannonia
- 8201 Veszprém
- Hungary
| | - Gyula Tircsó
- Department of Physical Chemistry
- Faculty of Science and Technology
- University of Debrecen
- Debrecen
- Hungary
| | - József Kaizer
- Department of Chemistry
- University of Pannonia
- 8201 Veszprém
- Hungary
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27
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Saeedifard F, Morgan MT, Bacsa J, Fahrni CJ. Preorganized PSP Ligands Yield Monomeric Cu(I) Complexes with Subzeptomolar Cu(I) Dissociation Constants. Inorg Chem 2019; 58:13631-13638. [PMID: 31124662 DOI: 10.1021/acs.inorgchem.9b00965] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Unraveling the function of biological copper (Cu) requires tools that can selectively recognize and manipulate this trace nutrient within the complex chemical environment of biological systems. Increasing evidence suggests that cells maintain an exchangeable pool of Cu(I) that is buffered in the high zeptomolar to low attomolar range. While mixed amine-thioether donors have been commonly employed for the design of Cu(I)-selective ligands and probes, their dissociation constants are limited to the pico- to femtomolar range. To address this challenge, we combined our previously devised phosphine sulfide-stabilized phosphine donor motifs with a rigid 1,2-phenylene or 1,8-naphthylene ligand backbone. The resulting ligands, phenPS and naphPS, bind Cu(I) with a 1:1 complex stoichiometry and offer dissociation constants of 0.6 and 0.8 zM, respectively. Concluding from the crystal structures of the free and Cu(I)-bound ligands, the 1,2-phenylene-bridged ligand phenPS provides a high degree of structural preorganization to accommodate the Cu(I) center without large conformational changes, while the 1,8-naphthylene-bridged ligand revealed significant out-of-plane distortions in both the free and Cu(I)-bound states. Both ligands were accessed by palladium-catalyzed cross-coupling reactions from the corresponding arylhalides under mild conditions, an approach that could be readily expanded toward the design of other ligands and probes.
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Affiliation(s)
- Farzaneh Saeedifard
- School of Chemistry and Biochemistry and Petit Institute for Bioengineering and Bioscience , Georgia Institute of Technology , 901 Atlantic Drive , Atlanta , Georgia 30332 , United States
| | - M Thomas Morgan
- School of Chemistry and Biochemistry and Petit Institute for Bioengineering and Bioscience , Georgia Institute of Technology , 901 Atlantic Drive , Atlanta , Georgia 30332 , United States
| | - John Bacsa
- School of Chemistry and Biochemistry and Petit Institute for Bioengineering and Bioscience , Georgia Institute of Technology , 901 Atlantic Drive , Atlanta , Georgia 30332 , United States.,X-ray Crystallography Center, Department of Chemistry , Emory University , 1515 Dickey Drive , Atlanta , Georgia 30322 , United States
| | - Christoph J Fahrni
- School of Chemistry and Biochemistry and Petit Institute for Bioengineering and Bioscience , Georgia Institute of Technology , 901 Atlantic Drive , Atlanta , Georgia 30332 , United States
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28
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Pujales-Paradela R, Carniato F, Esteban-Gómez D, Botta M, Platas-Iglesias C. Controlling water exchange rates in potential Mn 2+-based MRI agents derived from NO2A 2. Dalton Trans 2019; 48:3962-3972. [PMID: 30834411 DOI: 10.1039/c9dt00211a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
We report a series of pentadentate ligands based on a 1,4,7-triazacyclononane-1,4-diacetic acid (H2NO2A) containing different substituents attached to the third nitrogen atom of the macrocyclic unit. Detailed 1H Nuclear Magnetic Relaxation Dispersion (NMRD) characterisation of the corresponding Mn2+ complexes suggests the formation of six-coordinate species in solution containing an inner-sphere water molecule. This was confirmed by recording the transverse 17O relaxation time and chemical shift measurements. The water exchange rate of the coordinated water molecule was found to be strongly influenced by the nature of the substituent R at position 7 of the triazacyclononane unit (R = Me, k298ex = 62.6 × 107 s-1; R = Bz, k298ex = 4.4 × 107 s-1; R = 1-phenylethyl, k298ex = 2.6 × 107 s-1). The decreasing exchange rates are explained by the increasing bulkiness of the substituent, which hinders the approach of the entering water molecule in an associatively activated water exchange mechanism. This is supported by DFT calculations (M062X/TZVP), which confirm the associative nature of the water exchange reaction. A potentially decadentate ligand containing two NO2A units linked by a xylenyl spacer in the meta position was also synthesised. The corresponding binuclear Mn2+ complex contains two metal ions with different hydration numbers, as evidenced by 1H NMRD and 17O NMR measurements. DFT calculations show that this is related to the presence of a bridging bidentate μ-η1-carboxylate group connecting the two metal centers. The results reported in this work provide a straightforward strategy to control the exchange rate of the coordinated water molecule in this family of MRI contrast agent candidates.
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Affiliation(s)
- Rosa Pujales-Paradela
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
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29
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Brandt MR, Vanasschen C, Ermert J, Coenen HH, Neumaier B. 52g/55Mn-Labelled CDTA-based trimeric complexes as novel bimodal PET/MR probes with high relaxivity. Dalton Trans 2019; 48:3003-3008. [DOI: 10.1039/c8dt04996c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Multimeric trans-1,2-diaminocyclohexane-N,N,N′,N′-tetraacetic acid (CDTA) derivatives labelled with a mixture of paramagnetic 55Mn(ii) and β+-emitting 52gMn(ii) offer the access to bimodal Positron Emission Tomography/Magnetic Resonance (PET/MR) tracers.
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Affiliation(s)
- Marie R. Brandt
- Institute of Neuroscience and Medicine
- INM-5: Nuclear Chemistry
- Jülich
- Germany
| | | | - Johannes Ermert
- Institute of Neuroscience and Medicine
- INM-5: Nuclear Chemistry
- Jülich
- Germany
| | - Heinz H. Coenen
- Institute of Neuroscience and Medicine
- INM-5: Nuclear Chemistry
- Jülich
- Germany
| | - Bernd Neumaier
- Institute of Neuroscience and Medicine
- INM-5: Nuclear Chemistry
- Jülich
- Germany
- Institute of Radiochemistry and Experimental Molecular Imaging
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30
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Garda Z, Molnár E, Kálmán FK, Botár R, Nagy V, Baranyai Z, Brücher E, Kovács Z, Tóth I, Tircsó G. Effect of the Nature of Donor Atoms on the Thermodynamic, Kinetic and Relaxation Properties of Mn(II) Complexes Formed With Some Trisubstituted 12-Membered Macrocyclic Ligands. Front Chem 2018; 6:232. [PMID: 30151358 PMCID: PMC6099102 DOI: 10.3389/fchem.2018.00232] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 05/31/2018] [Indexed: 11/24/2022] Open
Abstract
During the past few years increasing attention has been devoted to Mn(II) complexes as possible substitutes for Gd(III) complexes as contrast agents in MRI. Equilibrium (log KMnL or pMn value), kinetic parameters (rates and half-lives of dissociation) and relaxivity of the Mn(II) complexes formed with 12-membered macrocyclic ligands were studied. The ligands were selected in a way to gain information on how the ligand rigidity, the nature of the donor atoms in the macrocycle (pyridine N, amine N, and etheric O atom), the nature of the pendant arms (carboxylates, phosphonates, primary, secondary and tertiary amides) affect the physicochemical parameters of the Mn(II) complexes. As expected, decreasing the denticity of DOTA (to afford DO3A) resulted in a drop in the stability and inertness of [Mn(DO3A)]- compared to [Mn(DOTA)]2-. This decrease can be compensated partially by incorporating the fourth nitrogen atom into a pyridine ring (e.g., PCTA) or by replacement with an etheric oxygen atom (ODO3A). Moreover, the substitution of primary amides for acetates resulted in a noticeable drop in the stability constant (PC3AMH), but it increased as the primary amides (PC3AMH) were replaced by secondary (PC3AMGly) or tertiary amide (PC3AMPip) pendants. The inertness of the Mn(II) complexes behaved alike as the rates of acid catalyzed dissociation increased going from DOTA (k1 = 0.040 M-1s-1) to DO3A (k1 = 0.45 M-1s-1). However, the rates of acid catalyzed dissociation decreased from 0.112 M-1s-1 observed for the anionic Mn(II) complex of PCTA to 0.0107 M-1s-1 and 0.00458 M-1s-1 for the cationic Mn(II) complexes of PC3AMH and PC3AMPip ligands, respectively. In spite of its lower denticity (as compared to DOTA) the sterically more hindered amide complex ([Mn(PC3AMPip)]2+) displays surprisingly high conditional stability (pMn = 8.86 vs. pMn = 9.74 for [Mn(PCTA)]-) and excellent kinetic inertness. The substitution of phosphonates for the acetate pendant arms (DOTP and DO3P), however, resulted in a noticeable drop in the conditional stability as well as dissociation kinetic parameters of the corresponding Mn(II) complexes ([Mn(DOTP)]6- and [Mn(DO3P)]4-) underlining that the phosphonate pedant should not be considered as a suitable building block for further ligand design while the tertiary amide moiety will likely have some implications in this respect in the future.
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Affiliation(s)
- Zoltán Garda
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - Enikő Molnár
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - Ferenc K. Kálmán
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - Richárd Botár
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - Viktória Nagy
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - Zsolt Baranyai
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - Ernő Brücher
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - Zoltán Kovács
- Advanced Imaging Research Center, The University of Texas Southwestern Medical Center, Dallas, TX, United States
| | - Imre Tóth
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - Gyula Tircsó
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
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