1
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Bauer D, Carter LM, Atmane MI, De Gregorio R, Michel A, Kaminsky S, Monette S, Li M, Schultz MK, Lewis JS. 212Pb-Pretargeted Theranostics for Pancreatic Cancer. J Nucl Med 2024; 65:109-116. [PMID: 37945380 PMCID: PMC10755526 DOI: 10.2967/jnumed.123.266388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 09/28/2023] [Indexed: 11/12/2023] Open
Abstract
Although pancreatic ductal adenocarcinoma (PDAC) is associated with limited treatment options and poor patient outcomes, targeted α-particle therapy (TAT) represents a promising development in the field. TAT shows potential in treating metastatic cancers, including those that have become resistant to conventional treatments. Among the most auspicious radionuclides stands the in vivo α-generator 212Pb. Combined with the imaging-compatible radionuclide 203Pb, this theranostic match is a promising modality rapidly translating into the clinic. Methods: Using the pretargeting approach between a radiolabeled 1,2,4,5-tetrazine (Tz) tracer and a trans-cyclooctene (TCO) modified antibody, imaging and therapy with radiolead were performed on a PDAC tumor xenograft mouse model. For therapy, 3 cohorts received a single administration of 1.1, 2.2, or 3.7 MBq of the pretargeting agent, [212Pb]Pb-DO3A-PEG7-Tz, whereby administered activity levels were guided by dosimetric analysis. Results: The treated mice were holistically evaluated; minimal-to-mild renal tubular necrosis was observed. At the same time, median survival doubled for the highest-dose cohort (10.7 wk) compared with the control cohort (5.1 wk). Conclusion: This foundational study demonstrated the feasibility and safety of pretargeted TAT with 212Pb in PDAC while considering dose limitations and potential adverse effects.
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Affiliation(s)
- David Bauer
- Department of Radiology and Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Lukas M Carter
- Department of Medical Physics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Mohamed I Atmane
- Laboratory of Comparative Pathology, Memorial Sloan Kettering Cancer Center, Weill Cornell Medicine, and Rockefeller University, New York, New York
| | - Roberto De Gregorio
- Department of Radiology and Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Alexa Michel
- Department of Radiology and Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Spencer Kaminsky
- Department of Radiology and Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Sebastien Monette
- Laboratory of Comparative Pathology, Memorial Sloan Kettering Cancer Center, Weill Cornell Medicine, and Rockefeller University, New York, New York
| | - Mengshi Li
- Perspective Therapeutics, Inc., Coralville, Iowa; and
| | | | - Jason S Lewis
- Department of Radiology and Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, New York;
- Department of Radiology and Pharmacology Program, Weill Cornell Medical College, New York, New York
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2
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Radiometal-Based PET/MRI Contrast Agents for Sensing Tumor Extracellular pH. BIOSENSORS 2022; 12:bios12020134. [PMID: 35200394 PMCID: PMC8870419 DOI: 10.3390/bios12020134] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 02/14/2022] [Accepted: 02/16/2022] [Indexed: 02/03/2023]
Abstract
Acidosis is a useful biomarker for tumor diagnoses and for evaluating early response to anti-cancer treatments. Despite these useful applications, there are few methods for non-invasively measuring tumor extracellular pH, and none are routinely used in clinics. Responsive MRI contrast agents have been developed, and they undergo a change in MRI signal with pH. However, these signal changes are concentration-dependent, and it is difficult to accurately measure the concentration of an MRI contrast agent in vivo. PET/MRI provides a unique opportunity to overcome this concentration dependence issue by using the PET component to report on the concentration of the pH-responsive MRI agent. Herein, we synthesized PET/MRI co-agents based on the design of a pH-dependent MRI agent, and we have correlated pH with the r1 relaxivity of the MRI co-agent. We have also developed a procedure that uses PET radioactivity measurements and MRI R1 relaxation rate measurements to determine the r1 relaxivity of the MRI co-agent, which can then be used to estimate pH. This simultaneous PET/MRI procedure accurately measured pH in solution, with a precision that depended on the concentration of the MRI co-agent. We used our procedure to measure extracellular pH in a subcutaneous flank model of MIA PaCa-2 pancreatic cancer. Although the PET co-agents were stable in serum, post-imaging studies showed evidence that the PET co-agents were degraded in vivo. These results showed that tumor acidosis can be evaluated with simultaneous PET/MRI, although improvements are needed to more precisely measure MRI R1 relaxation rates, and ensure the in vivo stability of the agents.
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3
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New 1,3-Disubstituted Benzo[ h]Isoquinoline Cyclen-Based Ligand Platform: Synthesis, Eu 3+ Multiphoton Sensitization and Imaging Applications. Molecules 2020; 26:molecules26010058. [PMID: 33374449 PMCID: PMC7795479 DOI: 10.3390/molecules26010058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Revised: 12/15/2020] [Accepted: 12/17/2020] [Indexed: 11/17/2022] Open
Abstract
The development of lanthanide-based luminescent probes with a long emission lifetime has the potential to revolutionize imaging-based diagnostic techniques. By a rational design strategy taking advantage of computational predictions, a novel, water-soluble Eu3+ complex from a cyclen-based ligand bearing 1,3-disubstituted benzo[h]isoquinoline arms was realized. The ligand has been obtained overcoming the lack of reactivity of position 3 of the isoquinoline moiety. Notably, steric hindrance of the heteroaromatic chromophore allowed selective and stoichiometry-controlled insertion of two or three antennas on the cyclen platform without any protection strategy. The complex bears a fourth heptanoic arm for easy conjugation to biomolecules. This new chromophore allowed the sensitization of the metal center either with one or two photons excitation. The suitability as a luminescent bioprobe was validated by imaging BMI1 oncomarker in lung carcinoma cells following an established immunofluorescence approach. The use of a conventional epifluorescence microscope equipped with a linear structured illumination module disclosed a simple and inexpensive way to image confocally Ln-bioprobes by single photon excitation in the 350–400 nm window, where ordinary confocal systems have no excitation sources.
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4
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Travagin F, Lattuada L, Giovenzana GB. First synthesis of orthogonally 1,7-diprotected cyclens. Org Chem Front 2019. [DOI: 10.1039/c9qo00184k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Six novel orthogonally 1,7-heterodiprotected cyclen derivatives have been prepared through an efficient and chromatography-free procedure.
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Affiliation(s)
- Fabio Travagin
- Bracco Imaging S.p.A
- Bracco Research Centre
- I-10100 Colleretto Giacosa (TO)
- Italy
- Dipartimento di Scienze del Farmaco
| | - Luciano Lattuada
- Bracco Imaging S.p.A
- Bracco Research Centre
- I-10100 Colleretto Giacosa (TO)
- Italy
| | - Giovanni B. Giovenzana
- Dipartimento di Scienze del Farmaco
- Università del Piemonte Orientale “A. Avogadro”
- I-28100 Novara
- Italy
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5
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Sarkar S, Bhatt N, Ha YS, Huynh PT, Soni N, Lee W, Lee YJ, Kim JY, Pandya DN, An GI, Lee KC, Chang Y, Yoo J. High in Vivo Stability of 64Cu-Labeled Cross-Bridged Chelators Is a Crucial Factor in Improved Tumor Imaging of RGD Peptide Conjugates. J Med Chem 2018; 61:385-395. [DOI: 10.1021/acs.jmedchem.7b01671] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Swarbhanu Sarkar
- Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University, Daegu 41944, South Korea
| | - Nikunj Bhatt
- Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University, Daegu 41944, South Korea
| | - Yeong Su Ha
- Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University, Daegu 41944, South Korea
| | - Phuong Tu Huynh
- Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University, Daegu 41944, South Korea
| | - Nisarg Soni
- Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University, Daegu 41944, South Korea
| | - Woonghee Lee
- Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University, Daegu 41944, South Korea
| | - Yong Jin Lee
- Department
of RI-Convergence Research, Korea Institute of Radiological and Medical Sciences, Seoul 139-706, South Korea
| | - Jung Young Kim
- Department
of RI-Convergence Research, Korea Institute of Radiological and Medical Sciences, Seoul 139-706, South Korea
| | - Darpan N. Pandya
- Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University, Daegu 41944, South Korea
| | - Gwang Il An
- Department
of RI-Convergence Research, Korea Institute of Radiological and Medical Sciences, Seoul 139-706, South Korea
| | - Kyo Chul Lee
- Department
of RI-Convergence Research, Korea Institute of Radiological and Medical Sciences, Seoul 139-706, South Korea
| | - Yongmin Chang
- Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University, Daegu 41944, South Korea
| | - Jeongsoo Yoo
- Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University, Daegu 41944, South Korea
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6
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Seebald LM, DeMott CM, Ranganathan S, Asare-Okai PN, Glazunova A, Chen A, Shekhtman A, Royzen M. Cobalt-based paramagnetic probe to study RNA-protein interactions by NMR. J Inorg Biochem 2017; 170:202-208. [PMID: 28260679 PMCID: PMC5956527 DOI: 10.1016/j.jinorgbio.2017.02.024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 12/16/2016] [Accepted: 02/10/2017] [Indexed: 11/16/2022]
Abstract
Paramagnetic resonance enhancement (PRE) is an NMR technique that allows studying three-dimensional structures of RNA-protein complexes in solution. RNA strands are typically spin labeled using nitroxide reagents, which provide minimal perturbation to the native structure. The current work describes an alternative approach, which is based on a Co2+-based probe that can be covalently attached to RNA in the vicinity of the protein's binding site using 'click' chemistry. Similar to nitroxide spin labels, the transition metal based probe is capable of attenuating NMR signal intensities from protein residues localized <40Å away. The extent of attenuation is related to the probe's distance, thus allowing for construction of the protein's contact surface map. This new paradigm has been applied to study binding of HIV-1 nucleocapsid protein 7, NCp7, to a model RNA pentanucleotide.
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Affiliation(s)
- Leah M Seebald
- Department of Chemistry, University at Albany, SUNY, 1400 Washington Ave. Albany, NY 12222, United States
| | - Christopher M DeMott
- Department of Chemistry, University at Albany, SUNY, 1400 Washington Ave. Albany, NY 12222, United States
| | - Srivathsan Ranganathan
- Department of Chemistry, University at Albany, SUNY, 1400 Washington Ave. Albany, NY 12222, United States
| | - Papa Nii Asare-Okai
- Department of Chemistry, University at Albany, SUNY, 1400 Washington Ave. Albany, NY 12222, United States
| | - Anastasia Glazunova
- Department of Chemistry, University at Albany, SUNY, 1400 Washington Ave. Albany, NY 12222, United States
| | - Alan Chen
- Department of Chemistry, University at Albany, SUNY, 1400 Washington Ave. Albany, NY 12222, United States
| | - Alexander Shekhtman
- Department of Chemistry, University at Albany, SUNY, 1400 Washington Ave. Albany, NY 12222, United States
| | - Maksim Royzen
- Department of Chemistry, University at Albany, SUNY, 1400 Washington Ave. Albany, NY 12222, United States.
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7
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Seebald LM, DeMott CM, Ranganathan S, Asare Okai PN, Glazunova A, Chen A, Shekhtman A, Royzen M. Cu(II)-Based Paramagnetic Probe to Study RNA-Protein Interactions by NMR. Inorg Chem 2017; 56:3773-3780. [PMID: 28328212 DOI: 10.1021/acs.inorgchem.6b02286] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Paramagnetic NMR techniques allow for studying three-dimensional structures of RNA-protein complexes. In particular, paramagnetic relaxation enhancement (PRE) data can provide valuable information about long-range distances between different structural components. For PRE NMR experiments, oligonucleotides are typically spin-labeled using nitroxide reagents. The current work describes an alternative approach involving a Cu(II) cyclen-based probe that can be covalently attached to an RNA strand in the vicinity of the protein's binding site using "click" chemistry. The approach has been applied to study binding of HIV-1 nucleocapsid protein 7 (NCp7) to a model RNA pentanucleotide, 5'-ACGCU-3'. Coordination of the paramagnetic metal to glutamic acid residue of NCp7 reduced flexibility of the probe, thus simplifying interpretation of the PRE data. NMR experiments showed attenuation of signal intensities from protein residues localized in proximity to the paramagnetic probe as the result of RNA-protein interactions. The extent of the attenuation was related to the probe's proximity allowing us to construct the protein's contact surface map.
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Affiliation(s)
- Leah M Seebald
- Department of Chemistry, University at Albany, SUNY , 1400 Washington Avenue, Albany, New York 12222, United States
| | - Christopher M DeMott
- Department of Chemistry, University at Albany, SUNY , 1400 Washington Avenue, Albany, New York 12222, United States
| | - Srivathsan Ranganathan
- Department of Chemistry, University at Albany, SUNY , 1400 Washington Avenue, Albany, New York 12222, United States
| | - Papa Nii Asare Okai
- Department of Chemistry, University at Albany, SUNY , 1400 Washington Avenue, Albany, New York 12222, United States
| | - Anastasia Glazunova
- Department of Chemistry, University at Albany, SUNY , 1400 Washington Avenue, Albany, New York 12222, United States
| | - Alan Chen
- Department of Chemistry, University at Albany, SUNY , 1400 Washington Avenue, Albany, New York 12222, United States
| | - Alexander Shekhtman
- Department of Chemistry, University at Albany, SUNY , 1400 Washington Avenue, Albany, New York 12222, United States
| | - Maksim Royzen
- Department of Chemistry, University at Albany, SUNY , 1400 Washington Avenue, Albany, New York 12222, United States
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8
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Synthesis and evaluation of copper-64 labeled benzofuran derivatives targeting β-amyloid aggregates. Bioorg Med Chem 2016; 24:3618-23. [PMID: 27301677 DOI: 10.1016/j.bmc.2016.06.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 06/01/2016] [Accepted: 06/01/2016] [Indexed: 11/20/2022]
Abstract
In vivo imaging of β-amyloid (Aβ) aggregates consisting of Aβ(1-40) and Aβ(1-42) peptides by positron emission tomography (PET) contributes to the diagnosis and therapy for Alzheimer's disease (AD). Because (64)Cu (t1/2=12.7h) is a radionuclide for PET with a longer physical half-life than (11)C (t1/2=20min) and (18)F (t1/2=110min), it is an attractive radionuclide for the development of Aβ imaging probes that are suitable for routine use. In the present study, we designed and synthesized two novel (64)Cu labeled benzofuran derivatives and evaluated their utility as PET imaging probes for Aβ aggregates. In an in vitro binding assay, 6 and 8 showed binding affinity for Aβ(1-42) aggregates with a Ki value of 33 and 243nM, respectively. In addition, these probes bound to Aβ plaques deposited in the brain of an AD model mouse in vitro. In a biodistribution experiment using normal mice, these probes showed low brain uptake (0.33% and 0.36% ID/g) at 2min post-injection. Although refinement to enhance brain uptake is needed, [(64)Cu]6 and [(64)Cu]8 demonstrated the feasibility of developing novel PET probes for imaging Aβ aggregates.
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9
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Dolan C, Drouet F, Ware DC, Brothers PJ, Jin J, Brimble MA, Williams DE. A new high-capacity metal ion-complexing gel containing cyclen ligands. RSC Adv 2016. [DOI: 10.1039/c6ra00604c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
“Hairy” nano-scale objects cross-linked into a high-capacity metal-binding hydrogel.
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Affiliation(s)
- Ciarán Dolan
- School of Chemical Sciences
- University of Auckland
- Auckland 1142
- New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology
| | - Fleur Drouet
- School of Chemical Sciences
- University of Auckland
- Auckland 1142
- New Zealand
| | - David C. Ware
- School of Chemical Sciences
- University of Auckland
- Auckland 1142
- New Zealand
| | - Penelope J. Brothers
- School of Chemical Sciences
- University of Auckland
- Auckland 1142
- New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology
| | - Jianyong Jin
- School of Chemical Sciences
- University of Auckland
- Auckland 1142
- New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology
| | - Margaret A. Brimble
- School of Chemical Sciences
- University of Auckland
- Auckland 1142
- New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology
| | - David E. Williams
- School of Chemical Sciences
- University of Auckland
- Auckland 1142
- New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology
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10
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Dale AV, An GI, Pandya DN, Ha YS, Bhatt N, Soni N, Lee H, Ahn H, Sarkar S, Lee W, Huynh PT, Kim JY, Gwon MR, Kim SH, Park JG, Yoon YR, Yoo J. Synthesis and Evaluation of New Generation Cross-Bridged Bifunctional Chelator for 64Cu Radiotracers. Inorg Chem 2015; 54:8177-86. [DOI: 10.1021/acs.inorgchem.5b01386] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ajit V. Dale
- Department of Molecular Medicine, BK21 Plus KNU Biomedical
Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
| | - Gwang Il An
- Molecular
Imaging Research Center, Korea Institute of Radiological and Medical Sciences, Seoul 139-706, South Korea
| | - Darpan N. Pandya
- Department of Molecular Medicine, BK21 Plus KNU Biomedical
Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
| | - Yeong Su Ha
- Department of Molecular Medicine, BK21 Plus KNU Biomedical
Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
| | - Nikunj Bhatt
- Department of Molecular Medicine, BK21 Plus KNU Biomedical
Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
| | - Nisarg Soni
- Department of Molecular Medicine, BK21 Plus KNU Biomedical
Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
| | - Hochun Lee
- Department of Energy Systems Engineering, Daegu Gyeongbuk Institute of Science & Technology, Daegu 711-873, South Korea
| | - Heesu Ahn
- Department of Molecular Medicine, BK21 Plus KNU Biomedical
Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
| | - Swarbhanu Sarkar
- Department of Molecular Medicine, BK21 Plus KNU Biomedical
Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
| | - Woonghee Lee
- Department of Molecular Medicine, BK21 Plus KNU Biomedical
Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
| | - Phuong Tu Huynh
- Department of Molecular Medicine, BK21 Plus KNU Biomedical
Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
| | - Jung Young Kim
- Molecular
Imaging Research Center, Korea Institute of Radiological and Medical Sciences, Seoul 139-706, South Korea
| | - Mi-Ri Gwon
- Department
of Biomedical Science and Clinical Trial Center, BK21 PLUS, KNU Bio-Medical
Convergence Program, Kyungpook National University Graduate School and Hospital, Daegu 700-422, South Korea
| | - Sung Hong Kim
- Analysis Research Division, Daegu Center, Korea Basic Science Institute, Daegu 702-701, South Korea
| | - Jae Gyu Park
- Pohang Center for Evaluation of Biomaterials, Pohang Technopark Foundation, Gyeongbuk 790-834, South Korea
| | - Young-Ran Yoon
- Department
of Biomedical Science and Clinical Trial Center, BK21 PLUS, KNU Bio-Medical
Convergence Program, Kyungpook National University Graduate School and Hospital, Daegu 700-422, South Korea
| | - Jeongsoo Yoo
- Department of Molecular Medicine, BK21 Plus KNU Biomedical
Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
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11
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Cakić N, Gündüz S, Rengarasu R, Angelovski G. Synthetic strategies for preparation of cyclen-based MRI contrast agents. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.12.087] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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12
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Pandya DN, Bhatt N, Dale AV, Kim JY, Lee H, Ha YS, Lee JE, An GI, Yoo J. New bifunctional chelator for 64Cu-immuno-positron emission tomography. Bioconjug Chem 2014; 24:1356-66. [PMID: 23883075 DOI: 10.1021/bc400192a] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A new tetraazamacrocyclic bifunctional chelator, TE2A-Bn-NCS, was synthesized in high overall yield from cyclam. An extra functional group (NCS) was introduced to the N-atom of TE2A for specific conjugation with antibody. The Cu complex of TE2A-Bn-NCS showed high kinetic stability in acidic decomplexation and cyclic voltammetry studies. X-ray structure determination of the Cu-TE2A-Bn-NH2 complex confirmed octahedral geometry, in which copper atom is strongly coordinated by four macrocyclic nitrogens in equatorial positions and two carboxylate oxygen atoms occupy the elongated axial positions. Trastuzumab was conjugated with TE2A-Bn-NCS and then radiolabeled with 64Cu quantitatively at room temperature within 10 min. Biodistribution studies showed that the 64Cu-labeled TE2A-Bn-NCS-trastuzumab conjugates maintain high stability in physiological conditions, and NIH3T6.7 tumors were clearly visualized up to 3 days by 64Cu-immuno-positron emission tomography imaging in animal models.
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13
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Pandya DN, Bhatt N, An GI, Ha YS, Soni N, Lee H, Lee YJ, Kim JY, Lee W, Ahn H, Yoo J. Propylene Cross-Bridged Macrocyclic Bifunctional Chelator: A New Design for Facile Bioconjugation and Robust 64Cu Complex Stability. J Med Chem 2014; 57:7234-43. [DOI: 10.1021/jm500348z] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Darpan N. Pandya
- Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
| | - Nikunj Bhatt
- Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
| | - Gwang Il An
- Molecular
Imaging Research Center, Korea Institute of Radiological and Medical Sciences, Seoul 139-706, South Korea
| | - Yeong Su Ha
- Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
| | - Nisarg Soni
- Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
| | - Hochun Lee
- Department of Energy Systems Engineering, Daegu Gyeongbuk Institute of Science & Technology, Daegu 711-873, South Korea
| | - Yong Jin Lee
- Molecular
Imaging Research Center, Korea Institute of Radiological and Medical Sciences, Seoul 139-706, South Korea
| | - Jung Young Kim
- Molecular
Imaging Research Center, Korea Institute of Radiological and Medical Sciences, Seoul 139-706, South Korea
| | - Woonghee Lee
- Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
| | - Heesu Ahn
- Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
| | - Jeongsoo Yoo
- Department
of Molecular Medicine, BK21 Plus KNU Biomedical Convergence Program, Kyungpook National University, Daegu 700-422, South Korea
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14
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Designing reactivity-based responsive lanthanide probes for multicolor detection in biological systems. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2013.10.012] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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15
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Dale AV, Pandya DN, Kim JY, Lee H, Ha YS, Bhatt N, Kim J, Seo JJ, Lee W, Kim SH, Yoon YR, An GI, Yoo J. Non-cross-bridged tetraazamacrocyclic chelator for stable (64)cu-based radiopharmaceuticals. ACS Med Chem Lett 2013; 4:927-31. [PMID: 24900586 DOI: 10.1021/ml400142s] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Accepted: 07/25/2013] [Indexed: 01/10/2023] Open
Abstract
N-mono/dimethylated TE2A tetraazamacrocycles (MM-TE2A and DM-TE2A) were synthesized in high yields. Both Cu-MM/DM-TE2A complexes showed increased kinetic stability compared to that of Cu-TE2A, whereas Cu-DM-TE2A showed even higher in vitro stability than that of Cu-ECB-TE2A. MM-TE2A and DM-TE2A were quantitatively radiolabeled with (64)Cu ions and showed rapid clearance from the body to emerge as a potential efficient bifunctional chelator.
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Affiliation(s)
- Ajit V. Dale
- Department of Molecular Medicine, Kyungpook National University School of Medicine, Daegu
700-422, South Korea
| | - Darpan N. Pandya
- Department of Molecular Medicine, Kyungpook National University School of Medicine, Daegu
700-422, South Korea
| | - Jung Young Kim
- Molecular
Imaging Research Centre, Korea Institute of Radiological and Medical Sciences, Seoul 139-706, South Korea
| | - Hochun Lee
- Department of Energy Systems Engineering, Daegu Gyeongbuk Institute of Science & Technology, Daegu 711-873, South Korea
| | - Yeong Su Ha
- Department of Molecular Medicine, Kyungpook National University School of Medicine, Daegu
700-422, South Korea
| | - Nikunj Bhatt
- Department of Molecular Medicine, Kyungpook National University School of Medicine, Daegu
700-422, South Korea
| | - Jonghee Kim
- Department of Molecular Medicine, Kyungpook National University School of Medicine, Daegu
700-422, South Korea
| | - Jeong Ju Seo
- Department
of Biomedical Science
and Clinical Trial Center, Kyungpook National University Graduates School and Hospital, Daegu, South Korea
| | - Woonghee Lee
- Department of Molecular Medicine, Kyungpook National University School of Medicine, Daegu
700-422, South Korea
| | - Sung Hong Kim
- Analysis Research Division,
Daegu Center, Korea Basic Science Institute, Daegu 702-701, South Korea
| | - Young-Ran Yoon
- Department
of Biomedical Science
and Clinical Trial Center, Kyungpook National University Graduates School and Hospital, Daegu, South Korea
| | - Gwang Il An
- Molecular
Imaging Research Centre, Korea Institute of Radiological and Medical Sciences, Seoul 139-706, South Korea
| | - Jeongsoo Yoo
- Department of Molecular Medicine, Kyungpook National University School of Medicine, Daegu
700-422, South Korea
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16
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Taniguchi M, Du H, Lindsey JS. Enumeration of virtual libraries of combinatorial modular macrocyclic (bracelet, necklace) architectures and their linear counterparts. J Chem Inf Model 2013; 53:2203-16. [PMID: 23944229 DOI: 10.1021/ci400175f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A wide variety of cyclic molecular architectures are built of modular subunits and can be formed combinatorially. The mathematics for enumeration of such objects is well-developed yet lacks key features of importance in chemistry, such as specifying (i) the structures of individual members among a set of isomers, (ii) the distribution (i.e., relative amounts) of products, and (iii) the effect of nonequal ratios of reacting monomers on the product distribution. Here, a software program (Cyclaplex) has been developed to determine the number, identity (including isomers), and relative amounts of linear and cyclic architectures from a given number and ratio of reacting monomers. The program includes both mathematical formulas and generative algorithms for enumeration; the latter go beyond the former to provide desired molecular-relevant information and data-mining features. The program is equipped to enumerate four types of architectures: (i) linear architectures with directionality (macroscopic equivalent = electrical extension cords), (ii) linear architectures without directionality (batons), (iii) cyclic architectures with directionality (necklaces), and (iv) cyclic architectures without directionality (bracelets). The program can be applied to cyclic peptides, cycloveratrylenes, cyclens, calixarenes, cyclodextrins, crown ethers, cucurbiturils, annulenes, expanded meso-substituted porphyrin(ogen)s, and diverse supramolecular (e.g., protein) assemblies. The size of accessible architectures encompasses up to 12 modular subunits derived from 12 reacting monomers or larger architectures (e.g. 13-17 subunits) from fewer types of monomers (e.g. 2-4). A particular application concerns understanding the possible heterogeneity of (natural or biohybrid) photosynthetic light-harvesting oligomers (cyclic, linear) formed from distinct peptide subunits.
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Affiliation(s)
- Masahiko Taniguchi
- Department of Chemistry, North Carolina State University , Raleigh, North Carolina 27695, United States
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Yapp DT, Ferreira CL, Gill RK, Boros E, Wong MQ, Mandel D, Jurek P, Kiefer GE. Imaging Tumor Vasculature Noninvasively with Positron Emission Tomography and RGD Peptides Labeled with Copper 64 Using the Bifunctonal Chelates DOTA, Oxo-DO3A. and PCTA. Mol Imaging 2013. [DOI: 10.2310/7290.2012.00044] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Affiliation(s)
- Donald T.T. Yapp
- From Department of Experimental Therapeutics, BC Cancer Agency, Vancouver, BC; Nordion, Vancouver, BC; TRIUMF, Vancouver, BC; Department of Chemistry, University of British Columbia, Vancouver, BC; and Macrocyclics, Dallas, TX
| | - Cara L. Ferreira
- From Department of Experimental Therapeutics, BC Cancer Agency, Vancouver, BC; Nordion, Vancouver, BC; TRIUMF, Vancouver, BC; Department of Chemistry, University of British Columbia, Vancouver, BC; and Macrocyclics, Dallas, TX
| | - Rajanvir K. Gill
- From Department of Experimental Therapeutics, BC Cancer Agency, Vancouver, BC; Nordion, Vancouver, BC; TRIUMF, Vancouver, BC; Department of Chemistry, University of British Columbia, Vancouver, BC; and Macrocyclics, Dallas, TX
| | - Eszter Boros
- From Department of Experimental Therapeutics, BC Cancer Agency, Vancouver, BC; Nordion, Vancouver, BC; TRIUMF, Vancouver, BC; Department of Chemistry, University of British Columbia, Vancouver, BC; and Macrocyclics, Dallas, TX
| | - May Q. Wong
- From Department of Experimental Therapeutics, BC Cancer Agency, Vancouver, BC; Nordion, Vancouver, BC; TRIUMF, Vancouver, BC; Department of Chemistry, University of British Columbia, Vancouver, BC; and Macrocyclics, Dallas, TX
| | - Derek Mandel
- From Department of Experimental Therapeutics, BC Cancer Agency, Vancouver, BC; Nordion, Vancouver, BC; TRIUMF, Vancouver, BC; Department of Chemistry, University of British Columbia, Vancouver, BC; and Macrocyclics, Dallas, TX
| | - Paul Jurek
- From Department of Experimental Therapeutics, BC Cancer Agency, Vancouver, BC; Nordion, Vancouver, BC; TRIUMF, Vancouver, BC; Department of Chemistry, University of British Columbia, Vancouver, BC; and Macrocyclics, Dallas, TX
| | - Garry E. Kiefer
- From Department of Experimental Therapeutics, BC Cancer Agency, Vancouver, BC; Nordion, Vancouver, BC; TRIUMF, Vancouver, BC; Department of Chemistry, University of British Columbia, Vancouver, BC; and Macrocyclics, Dallas, TX
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18
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Comba P, Martin B, Sanyal A, Stephan H. The computation of lipophilicities of 64Cu PET systems based on a novel approach for fluctuating charges. Dalton Trans 2013; 42:11066-73. [DOI: 10.1039/c3dt51049b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Varshney R, Hazari PP, Fernandez P, Schulz J, Allard M, Mishra AK. (68)Ga-labeled bombesin analogs for receptor-mediated imaging. Recent Results Cancer Res 2013; 194:221-256. [PMID: 22918762 DOI: 10.1007/978-3-642-27994-2_12] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Targeted receptor-mediated imaging techniques have become crucial tools in present targeted diagnosis and radiotherapy as they provide accurate and specific diagnosis of disease information. Peptide-based pharmaceuticals are gaining popularity, and there has been vast interest in developing (68)Ga-labeled bombesin (Bn) analogs. The gastrin-releasing peptide (GRP) family and its Bn analog have been implicated in the biology of several human cancers. The three bombesin receptors GRP, NMB, and BRS-3 receptor are most frequently ectopically expressed by common, important malignancies. The low expression of Bn/GRP receptors in normal tissue and relatively high expression in a variety of human tumors can be of biological importance and form a molecular basis for Bn/GRP receptor-mediated imaging. To develop a Bn-like peptide with favorable tumor targeting and pharmacokinetic characteristics for possible clinical use, several modifications in the Bn-like peptides, such as the use of a variety of chelating agents, i.e., acyclic and macrocyclic agents with different spacer groups and with different metal ions (gallium), have been performed in recent years without significant disturbance of the vital binding scaffold. The favorable physical properties of (68)Ga, i.e., short half-life, and the fast localization of small peptides make this an ideal combination to study receptor-mediated imaging in patients.
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20
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Pandya DN, Dale AV, Kim JY, Lee H, Ha YS, An GI, Yoo J. New macrobicyclic chelator for the development of ultrastable 64Cu-radiolabeled bioconjugate. Bioconjug Chem 2012; 23:330-5. [PMID: 22329542 DOI: 10.1021/bc200539t] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Ethylene cross-bridged cyclam with two acetate pendant arms, ECB-TE2A, is known to form the most kinetically stable (64)Cu complexes. However, its usefulness as a bifunctional chelator is limited because of its harsh radiolabeling conditions. Herein, we report new cross-bridged cyclam chelator for the development of ultrastable (64)Cu-radiolabeled bioconjugates. Propylene cross-bridged TE2A (PCB-TE2A) was successfully synthesized in an efficient way. The Cu(II) complex of PCB-TE2A exhibited much higher kinetic stability than ECB-TE2A in acid decomplexation studies, and also showed high resistance to reduction-mediated demetalation. Furthermore, the quantitative radiolabeling of PCB-TE2A with (64)Cu was achieved under milder conditions compared to ECB-TE2A. Biodistribution studies strongly indicate that the (64)Cu complexes of PCB-TE2A cleared out rapidly from the body with minimum decomplexation.
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Affiliation(s)
- Darpan N Pandya
- Department of Molecular Medicine, Kyungpook National University, Daegu 700-422, South Korea
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21
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Röhrich A, Bergmann R, Kretzschmann A, Noll S, Steinbach J, Pietzsch J, Stephan H. A novel tetrabranched neurotensin(8-13) cyclam derivative: synthesis, 64Cu-labeling and biological evaluation. J Inorg Biochem 2011; 105:821-32. [PMID: 21497581 DOI: 10.1016/j.jinorgbio.2011.02.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2010] [Revised: 01/21/2011] [Accepted: 02/21/2011] [Indexed: 12/11/2022]
Abstract
New macrocyclic 1,4,8,11-tetraazacyclotetradecane (cyclam) derivatives with 1, 2 and 4 neurotensin(8-13) units 4, 5 and 7 have been synthesized. Compounds 4 and 5 were prepared by the reaction of non-stabilized neurotensin(8-13) and cyclamtetrapropionic acid 2 using 1-ethyl-3-(3-dimethylaminocarbonyl)carbodiimide-hydrochloride and N-hydroxysulfosuccinimide. The tetrameric compound 7 was synthesized by Michael addition of neurotensin(8-13) acrylamide 6 and cyclam 1. The copper(II) complexation behavior of 4, 5 and 7 was investigated by UV/visible spectrophotometry and shows that the metal center resides inside the N4 chromophore with additional apical interactions established with pendant arms. The novel tetrabranched NT(8-13) cyclam 7 with nanomolar neurotensin receptor 1 binding affinity was efficiently radiolabeled with (64)Cu under mild conditions. (64)Cu⊂7 showed slow transchelation in the presence of a large amount of cyclam as competing ligand, while it completely remains intact in the presence of EDTA. The in vivo behavior of (64)Cu⊂7 was studied in rats and mice. The metabolic stability in rodent models was high with a half-life of intact (64)Cu⊂7 in plasma of 34 min in rats and 60 min in the mice, respectively. The binding affinity was high enough to demonstrate in vivo binding of (64)Cu⊂7 to NTR1 overexpressing HT-29 tumor xenotransplants in nude mice. Regarding elimination, (64)Cu⊂7 showed a substantial renal and reticuloendothelial accumulation. On the other hand, metabolization of the compound in vivo with a resulting metabolite-postulated to be the (64)Cu-cyclam-tetraarginine complex-also showed long retention in the circulating blood, preventing a better contrast of tumor imaging.
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Affiliation(s)
- Anika Röhrich
- Institute of Radiopharmacy, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
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22
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Synthesis, crystal structure, and urease inhibition studies of copper(II) and cobalt(III) complexes with bi(2-fluorobenzylaminoethyl)amine. TRANSIT METAL CHEM 2011. [DOI: 10.1007/s11243-011-9472-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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23
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Wadas TJ, Wong EH, Weisman GR, Anderson CJ. Coordinating radiometals of copper, gallium, indium, yttrium, and zirconium for PET and SPECT imaging of disease. Chem Rev 2010; 110:2858-902. [PMID: 20415480 PMCID: PMC2874951 DOI: 10.1021/cr900325h] [Citation(s) in RCA: 671] [Impact Index Per Article: 47.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Thaddeus J Wadas
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S. Kingshighway Blvd., Campus Box 8225 St. Louis, Missouri 63110, USA.
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24
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Pandya DN, Kim JY, Park JC, Lee H, Phapale PB, Kwak W, Choi TH, Cheon GJ, Yoon YR, Yoo J. Revival of TE2A; a better chelate for Cu(II) ions than TETA? Chem Commun (Camb) 2010; 46:3517-9. [DOI: 10.1039/b925703a] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Development and physicochemical characterization of copper complexes-loaded PLGA nanoparticles. Int J Pharm 2009; 379:226-34. [PMID: 19428198 DOI: 10.1016/j.ijpharm.2009.03.036] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2009] [Revised: 03/17/2009] [Accepted: 03/27/2009] [Indexed: 11/24/2022]
Abstract
PLGA nanoparticles were prepared via a modified W/O/W emulsion solvent diffusion process, in which all formulation components were fully biocompatible and biodegradable. Different independent processing parameters were systematically studied. Nanoparticles were characterized by DLS (particle size, polydispersity, zeta-potential) and TEM/AFM (surface morphology). An optimized formulation was used to encapsulate copper complexes of cyclen and DOTA as potential PET imaging agents. Results showed that the predominant formulation factors appeared to be the lactide-to-glycolide (L:G) ratio of PLGA, the nature of the diffusion phase, and the presence of hydroxyl ions in the first-emulsion aqueous phase. By regulating those 3 parameters, PLGA nanoparticles were prepared with very good preparation yields (>95%), a size less than 200 nm and a polydispersity index less than 0.1. TEM pictures showed nanoparticles with a narrow size distribution, a spherical shape and a smooth surface. The optimized formulation allowed to encapsulate Cu-cyclen and Cu-DOTA complexes with an encapsulation efficiency between 20% and 25%.
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26
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Ferreira CL, Yapp DT, Lamsa E, Gleave M, Bensimon C, Jurek P, Kiefer GE. Evaluation of novel bifunctional chelates for the development of Cu-64-based radiopharmaceuticals. Nucl Med Biol 2009; 35:875-82. [PMID: 19026949 DOI: 10.1016/j.nucmedbio.2008.09.001] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2008] [Revised: 08/25/2008] [Accepted: 09/05/2008] [Indexed: 11/17/2022]
Abstract
BACKGROUND Currently available bifunctional chelates (BFCs) for attaching Cu-64 to a targeting molecule are limited by either their radiolabeling conditions or in vivo stability. With the goal of identifying highly effective BFCs, we compared the properties of two novel BFCs, 1-oxa-4,7,10-triazacyclododecane-S-5-(4-nitrobenzyl)-4,7,10-triacetic acid (p-NO(2)-Bn-Oxo) and 3,6,9,15-tetraazabicyclo[9.3.1]pentadeca-1(15),11,13-triene-S-4-(4-nitrobenzyl)-3,6,9-triacetic acid (p-NO(2)-Bn-PCTA), with the commonly used S-2-(4-nitrobenzyl)-1,4,7,10-tetraazacyclododecanetetraacetic acid (p-NO(2)-Bn-DOTA). METHODS p-NO(2)-Bn-DOTA, p-NO(2)-Bn-Oxo and p-NO(2)-Bn-PCTA were each radiolabeled with Cu-64 under various conditions to assess the reaction kinetics and robustness of the radiolabeling. Stability of each Cu-64 BFC complex was evaluated at low pH and in serum. Small animal positron emission tomography imaging and biodistribution studies in mice were undertaken. RESULTS p-NO(2)-Bn-Oxo and p-NO(2)-Bn-PCTA possessed superior reaction kinetics compared to p-NO(2)-Bn-DOTA under all radiolabeling conditions; >98% radiochemical yields were achieved in <5 min at room temperature even when using near stoichiometric amounts of BFC. Under nonideal conditions, such as low or high pH, high radiochemical yields were still achievable with the novel BFCs. The radiolabeled compounds were stable in serum and at pH 2 for 48 h. The imaging and biodistribution of the Cu-64-radiolabeled BFCs illustrated differences between the BFCs, including preferential clearance via the kidneys for the p-NO(2)-Bn-PCTA Cu-64 complex. CONCLUSIONS The novel BFCs facilitated efficient Cu-64 radiolabeling under mild conditions to produce stable complexes at potentially high specific activities. These BFCs may find wide utility in the development of Cu-64-based radiopharmaceuticals.
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Affiliation(s)
- Cara L Ferreira
- MDS Nordion, 4004 Wesbrook Mall, Vancouver, BC, Canada V6T 2A3.
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Affiliation(s)
- Mojmír Suchý
- Department of Chemistry, The University of Western Ontario, London, ON, Canada N6A 5B7
- Centre for Functional and Metabolic Mapping, Robarts Research Institute, The University of Western Ontario, London, ON, Canada N6A 5K8
| | - Robert H. E. Hudson
- Department of Chemistry, The University of Western Ontario, London, ON, Canada N6A 5B7
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Suchý M, Li AX, Bartha R, Hudson RHE. A new synthesis of cystamine modified Eu3+ DOTAM-Gly-Phe-OH: a conjugation ready temperature sensitive MRI contrast agent. Org Biomol Chem 2008; 6:3588-96. [PMID: 19082160 DOI: 10.1039/b808282k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Several approaches towards asymmetrically derivatized peptide-decorated cyclens that yield lanthanide metal chelators, in which three of the nitrogen atoms of cyclen share a common substituent and the fourth nitrogen atom is differentially substituted, have been evaluated. The most effective route consisted of selective monoalkylation followed by peralkylation with a second different electrophile. The unique substituent also possessed a masked sulfanyl group that was suitable for subsequent chemoselective conjugation chemistry.
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Affiliation(s)
- Mojmír Suchý
- Department of Chemistry, The University of Western Ontario, London, ON, Canada N6A 5B7
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29
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Borbas KE, Bruce JI. Synthesis of asymmetrically substituted cyclen-based ligands for the controlled sensitisation of lanthanides. Org Biomol Chem 2007; 5:2274-82. [PMID: 17609759 DOI: 10.1039/b705757a] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A series of unsymmetrical cyclen-based ligands incorporating an antenna and a quencher have been prepared for the complexation of the visible- (Eu, Tb) and near IR-emitting (Nd, Yb) lanthanides. Eu and Tb were sensitised with coumarin 2, and Nd and Yb with rhodamine. Both antennae were paired with nucleoside (uridine and adenosine) quenchers. The interaction between the quencher and the antenna can be regulated by the addition of the complementary base or DNA to the complexes, resulting in changes in the lanthanide luminescence intensity and lifetime.
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Affiliation(s)
- K Eszter Borbas
- The Department of Chemistry, The Open University, Walton Hall, Milton Keynes, UK MK7 6AA
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Chong HS, Milenic DE, Garmestani K, Brady ED, Arora H, Pfiester C, Brechbiel MW. In vitro and in vivo evaluation of novel ligands for radioimmunotherapy. Nucl Med Biol 2006; 33:459-67. [PMID: 16720237 DOI: 10.1016/j.nucmedbio.2006.03.004] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2005] [Revised: 01/30/2006] [Accepted: 03/07/2006] [Indexed: 11/25/2022]
Abstract
Novel ligands cis-2,6-bis[N,N-bis(carboxymethyl)aminomethyl]-1-piperidineacetic acid (PIP-DTPA), cis-[(1R,11S)-6,9,15-Tris-carboxymethyl-3,6,9,15-tetraazabicyclo[9.3.1]pentadec-3-yl]-acetic acid (PIP-DOTA), cis-{2,7-bis-[bis-carboxymethyl-amino)-methyl]-azepan-1-yl}-acetic acid (AZEP-DTPA), [2-(4,7-bis-carboxymethyl-[1,4,7]triazacyclononan-1-yl-ethyl]-2-carbonylmethyl-amino]-tetraacetic acid (NETA) and [{4-carboxymethyl-7-[2-(carboxymethylamino)-ethyl]-perhydro-1,4,7-triazonin-1-yl}-acetic acid (NPTA) are investigated as potential chelators of 177Lu, 90Y, 212Pb and 213Bi for radioimmunotherapy (RIT). The new ligands are radiolabeled with 177Lu, 86/88/90Y, 203Pb and 205/6Bi, and in vitro stability and in vivo stability of the radiolabeled complexes are assessed in human serum and athymic mice, respectively. In vitro studies indicate that all radiolabeled complexes with the exception of 90Y-AZEP-DTPA are stable in serum for 5-11 days. All new ligands examined herein are found to tightly hold 177Lu in vivo. Piperidine-backboned DTPA (PIP-DTPA) complexes radiolabeled with all radioisotopes examined display excellent in vivo stability, that is, excretion without dissociation. The azepane-backboned DTPA derivative, AZEP-DTPA, appears ineffective in binding all but 177Lu in vivo. NETA and NPTA radiolabeled with 86Y or 177Lu exhibit rapid blood clearance and low organ uptakes. Significant accretion in the kidney, femur and/or liver is observed with 203Pb-labeled AZEP-DTPA, PIP-DOTA and NPTA. Both 203Pb-PIP-DOTA and 205/6Bi-PIP-DOTA result in moderate to high renal accumulation of radioactivity. NETA exhibits improved renal accumulation with respect to PIP-DOTA for 205/6Bi but also shows significant liver uptake. Of all ligands studied, only PIP-DTPA appears to effectively bind 203Pb and 205/6Bi in vivo. PIP-DTPA, PIP-DOTA, NETA and NPTA all show strong evidence of rapid blood clearance and low organ uptake for 177Lu and 90Y. Serum stability and in vivo biodistribution results suggest PIP-DTPA as a potential chelating agent with broad applicability for use in 177Lu, 90Y, 212Pb and 213Bi RIT.
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Affiliation(s)
- Hyun-Soon Chong
- Radioimmune and Inorganic Chemistry Section, Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD, USA.
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Kruppa M, Frank D, Leffler-Schuster H, König B. Screening of metal complex–amino acid side chain interactions by potentiometric titration. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2005.12.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Chaux F, Denat F, Espinosa E, Guilard R. An easy route towards regioselectively difunctionalized cyclens and new cryptands. Chem Commun (Camb) 2006:5054-6. [PMID: 17146525 DOI: 10.1039/b612293k] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reductive amination of various aldehydes with cyclen represents a very convenient method for the synthesis of a wide range of 1,7-difunctionalized cyclens, as well as new cryptands.
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Affiliation(s)
- Fanny Chaux
- Laboratoire d'Ingénierie Moléculaire pour la Séparation et les Applications des Gaz, LIMSAG UMR 5633, Université de Bourgogne, 9 Av. Alain Savary BP47870, 21078 Dijon, France
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Wolohan P, Yoo J, Welch MJ, Reichert DE. QSAR studies of copper azamacrocycles and thiosemicarbazones: MM3 parameter development and prediction of biological properties. J Med Chem 2005; 48:5561-9. [PMID: 16107156 PMCID: PMC2566539 DOI: 10.1021/jm0501376] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Genetic algorithms (GA) were used to develop specific copper metal-ligand force field parameters for the MM3 force field, from a combination of crystallographic structures and ab initio calculations. These new parameters produced results in good agreement with experiment and previously reported copper metal-ligand parameters for the AMBER force field. The MM3 parameters were then used to develop several quantitative structure-activity relationship (QSAR) models. A successful QSAR for predicting the lipophilicity (log P(ow)) of several classes of Cu(II)-chelating ligands was built using a training set of 32 Cu(II) radiometal complexes and 6 simple molecular descriptors. The QSAR exhibited a correlation between the predicted and experimental log P(ow) with an r(2) = 0.95, q(2) = 0.92. When applied to an external test set of 11 Cu(II) complexes, the QSAR preformed with great accuracy; r(2) = 0.93 and a q(2) = 0.91 utilizing a leave-one-out cross-validation analysis. Additional QSAR models were developed to predict the biodistribution of a smaller set of Cu(II) bis(thiosemicarbazone) complexes.
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Affiliation(s)
- Peter Wolohan
- Washington University School of Medicine, St. Louis, Missouri 63110, USA
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Yu J, Parker D. Synthesis of a Europium Complex for Anion-Sensing Involving Regioselective Substitution of Cyclen. European J Org Chem 2005. [DOI: 10.1002/ejoc.200500432] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Yoo J, Reichert DE, Kim J, Anderson CJ, Welch MJ. A Potential Dubin-Johnson Syndrome Imaging Agent: Synthesis, Biodistribution, and MicroPET Imaging. Mol Imaging 2005; 4:18-29. [PMID: 15967123 DOI: 10.1162/15353500200504160] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2004] [Accepted: 11/23/2004] [Indexed: 11/04/2022] Open
Abstract
Dubin-Johnson syndrome (DJS) is caused by a deficiency of the human canalicular multispecific organic anion transporter (cMOAT). A new lipophilic copper-64 complex of 1,4,7-tris(carboxymethyl)-10-(tetradecyl)-1,4,7,10-tetraazadodecane (5) was prepared and evaluated for potential as a diagnostic tool for DJS. The prepared ligand was labeled with (64)Cu citrate in high radiochemical purity. In vivo uptake and clearance of the complex was determined through biodistribution studies using normal Sprague-Dawley rats and mutant cMOAT-deficient (TR(-)) rats. In normal rats, the radioactive copper complex was cleared quickly from the body exclusively through the hepatic pathway. The (64)Cu complex was taken up rapidly by the liver and quickly excreted into the small intestine and then the upper large intestine, whereas <1% ID/organ was found in the kidney at all time points post injection. Whereas activity was accumulated continuously in the liver of TR(-) rats, it was not excreted into the small intestine. MicroPET studies of normal and TR(-) rats were consistent with biodistribution data and showed dramatically different images. This study strongly suggests that cMOAT is involved in excretion of (64)Cu-5. The significant difference between the biodistribution data and microPET images of the normal and TR(-) rats demonstrates that this new (64)Cu complex may allow noninvasive diagnosis of DJS in humans.
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Affiliation(s)
- Jeongsoo Yoo
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 South Kingshighway Boulevard, St. Louis, MO 63110, USA
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