51
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Domnanich KA, Müller C, Farkas R, Schmid RM, Ponsard B, Schibli R, Türler A, van der Meulen NP. 44Sc for labeling of DOTA- and NODAGA-functionalized peptides: preclinical in vitro and in vivo investigations. EJNMMI Radiopharm Chem 2016; 1:8. [PMID: 29564385 PMCID: PMC5843811 DOI: 10.1186/s41181-016-0013-5] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Accepted: 04/21/2016] [Indexed: 12/27/2022] Open
Abstract
Background Recently, 44Sc (T1/2 = 3.97 h, Eβ+av = 632 keV, I = 94.3 %) has emerged as an attractive radiometal candidate for PET imaging using DOTA-functionalized biomolecules. The aim of this study was to investigate the potential of using NODAGA for the coordination of 44Sc. Two pairs of DOTA/NODAGA-derivatized peptides were investigated in vitro and in vivo and the results obtained with 44Sc compared with its 68Ga-labeled counterparts. DOTA-RGD and NODAGA-RGD, as well as DOTA-NOC and NODAGA-NOC, were labeled with 44Sc and 68Ga, respectively. The radiopeptides were investigated with regard to their stability in buffer solution and under metal challenge conditions using Fe3+ and Cu2+. Time-dependent biodistribution studies and PET/CT imaging were performed in U87MG and AR42J tumor-bearing mice. Results Both RGD- and NOC-based peptides with a DOTA chelator were readily labeled with 44Sc and 68Ga, respectively, and remained stable over at least 4 half-lives of the corresponding radionuclide. In contrast, the labeling of NODAGA-functionalized peptides with 44Sc was more challenging and the resulting radiopeptides were clearly less stable than the DOTA-derivatized matches. 44Sc-NODAGA peptides were clearly more susceptible to metal challenge than 44Sc-DOTA peptides under the same conditions. Instability of 68Ga-labeled peptides was only observed if they were coordinated with a DOTA in the presence of excess Cu2+. Biodistribution data of the 44Sc-labeled peptides were largely comparable with the data obtained with the 68Ga-labeled counterparts. It was only in the liver tissue that the uptake of 68Ga-labeled DOTA compounds was markedly higher than for the 44Sc-labeled version and this was also visible on PET/CT images. The 44Sc-labeled NODAGA-peptides showed a similar tissue distribution to those of the DOTA peptides without any obvious signs of in vivo instability. Conclusions Although DOTA revealed to be the preferred chelator for stable coordination of 44Sc, the data presented in this work indicate the possibility of using NODAGA in combination with 44Sc. In view of a clinical study, thorough investigations will be necessary regarding the labeling conditions and storage solutions in order to guarantee sufficient stability of 44Sc-labeled NODAGA compounds. Electronic supplementary material The online version of this article (doi:10.1186/s41181-016-0013-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Katharina A Domnanich
- Laboratory of Radiochemistry, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland.,Department of Chemistry and Biochemistry, University of Bern, 3012 Bern, Switzerland
| | - Cristina Müller
- Center for Radiopharmaceutical Sciences ETH-PSI-USZ, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland.,Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Renata Farkas
- Center for Radiopharmaceutical Sciences ETH-PSI-USZ, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland
| | - Raffaella M Schmid
- Center for Radiopharmaceutical Sciences ETH-PSI-USZ, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland
| | | | - Roger Schibli
- Center for Radiopharmaceutical Sciences ETH-PSI-USZ, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland.,Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Andreas Türler
- Laboratory of Radiochemistry, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland.,Department of Chemistry and Biochemistry, University of Bern, 3012 Bern, Switzerland
| | - Nicholas P van der Meulen
- Laboratory of Radiochemistry, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland.,Center for Radiopharmaceutical Sciences ETH-PSI-USZ, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland
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52
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Li J, Yang W, Cui R, Wang D, Chang Y, Gu W, Yin W, Bai X, Chen K, Xia L, Geng H, Xing G. Metabolizer in vivo of fullerenes and metallofullerenes by positron emission tomography. NANOTECHNOLOGY 2016; 27:155101. [PMID: 26926042 DOI: 10.1088/0957-4484/27/15/155101] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Fullerenes (C60) and metallofullerenes (Gd@C82) have similar chemical structure, but the bio-effects of both fullerene-based materials are distinct in vivo. Tracking organic carbon-based materials such as C60 and Gd@C82 is difficult in vivo due to the high content of carbon element in the living tissues themselves. In this study, the biodistribution and metabolism of fullerenes (C60 and Gd@C82) radiolabeled with (64)Cu were observed by positron emission tomography (PET). (64)Cu-C60 and (64)Cu-Gd@C82 were prepared using 1, 4, 7, 10-tetrakis (carbamoylmethyl)-1, 4, 7, 10-tetra-azacyclodo-decanes grafted on carbon cages as a chelator for (64)Cu, and were obtained rapidly with high radiochemical yield (≥90%). The new radio-conjugates were evaluated in vivo in the normal mouse model and tissue distribution by small animal PET/CT imaging and histology was carried out. The PET imaging, the biodistribution and the excretion of C60 and Gd@C82 indicated that C60 samples have higher blood retention and lower renal clearance than the Gd@C82 samples in vivo and suggested that the differences in metabolism and distribution in vivo were caused by the structural differences of the groups on the fullerene cages though there is chemical similarity between C60 and Gd@C82.
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Affiliation(s)
- Juan Li
- CAS Key Laboratory for Biomedical Effects of Nanomaterial & Nanosafety, Institute of High Energy Physics, Chinese Academy of Science (CAS), Beijing 100049, People's Republic of China
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53
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Bang S, Kim J, Jang BW, Kang SG, Kwak CH. Reduction of nitrile to primary amine using sodium borohydride: Synthesis and protonation of a cis -octahedral macrocyclic nickel(II) complex bearing two 2-aminoethyl pendant arms. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.02.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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54
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Wu F, Ye G, Yi R, Sun T, Xu C, Chen J. Novel polyazamacrocyclic receptor decorated core–shell superparamagnetic microspheres for selective binding and magnetic enrichment of palladium: synthesis, adsorptive behavior and coordination mechanism. Dalton Trans 2016; 45:9553-64. [DOI: 10.1039/c6dt01024e] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Novel core–shell superparamagnetic microspheres decorated with polyazamacrocyclic receptors for selective enrichment of palladium.
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Affiliation(s)
- Fengcheng Wu
- Collaborative Innovation Center of Advanced Nuclear Energy Technology
- Institute of Nuclear and New Energy Technology
- Tsinghua University
- Beijing 100084
- China
| | - Gang Ye
- Collaborative Innovation Center of Advanced Nuclear Energy Technology
- Institute of Nuclear and New Energy Technology
- Tsinghua University
- Beijing 100084
- China
| | - Rong Yi
- Collaborative Innovation Center of Advanced Nuclear Energy Technology
- Institute of Nuclear and New Energy Technology
- Tsinghua University
- Beijing 100084
- China
| | - Taoxiang Sun
- Collaborative Innovation Center of Advanced Nuclear Energy Technology
- Institute of Nuclear and New Energy Technology
- Tsinghua University
- Beijing 100084
- China
| | - Chao Xu
- Collaborative Innovation Center of Advanced Nuclear Energy Technology
- Institute of Nuclear and New Energy Technology
- Tsinghua University
- Beijing 100084
- China
| | - Jing Chen
- Collaborative Innovation Center of Advanced Nuclear Energy Technology
- Institute of Nuclear and New Energy Technology
- Tsinghua University
- Beijing 100084
- China
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55
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Albalad J, Aríñez-Soriano J, Vidal-Gancedo J, Lloveras V, Juanhuix J, Imaz I, Aliaga-Alcalde N, Maspoch D. Hetero-bimetallic paddlewheel clusters in coordination polymers formed by a water-induced single-crystal-to-single-crystal transformation. Chem Commun (Camb) 2016; 52:13397-13400. [DOI: 10.1039/c6cc07653j] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Hetero-bimetallic paddlewheel clusters in coordination polymers are formed through a water-induced single-crystal to single-crystal transformation.
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Affiliation(s)
- Jorge Albalad
- Catalan Institute of Nanoscience and Nanotechnology (ICN2)
- CSIC and The Barcelona Institute of Science and Technology
- Campus UAB
- Bellaterra
- Spain
| | - Javier Aríñez-Soriano
- Catalan Institute of Nanoscience and Nanotechnology (ICN2)
- CSIC and The Barcelona Institute of Science and Technology
- Campus UAB
- Bellaterra
- Spain
| | - José Vidal-Gancedo
- Institut de Ciència de Materials de Barcelona (ICMAB-SCIC)
- Bellaterra
- Spain
- CIBER-BBN
- Barcelona
| | - Vega Lloveras
- Institut de Ciència de Materials de Barcelona (ICMAB-SCIC)
- Bellaterra
- Spain
- CIBER-BBN
- Barcelona
| | | | - Inhar Imaz
- Catalan Institute of Nanoscience and Nanotechnology (ICN2)
- CSIC and The Barcelona Institute of Science and Technology
- Campus UAB
- Bellaterra
- Spain
| | - Núria Aliaga-Alcalde
- Institut de Ciència de Materials de Barcelona (ICMAB-SCIC)
- Bellaterra
- Spain
- ICREA
- 08010 Barcelona
| | - Daniel Maspoch
- Catalan Institute of Nanoscience and Nanotechnology (ICN2)
- CSIC and The Barcelona Institute of Science and Technology
- Campus UAB
- Bellaterra
- Spain
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56
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Magnetic Bistability in Lanthanide-Based Molecular Systems: The Role of Anisotropy and Exchange Interactions. INCLUDING ACTINIDES 2016. [DOI: 10.1016/bs.hpcre.2016.09.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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57
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Jeong K, Slack CC, Vassiliou CC, Dao P, Gomes MD, Kennedy DJ, Truxal AE, Sperling LJ, Francis MB, Wemmer DE, Pines A. Investigation of DOTA-Metal Chelation Effects on the Chemical Shift of (129) Xe. Chemphyschem 2015; 16:3573-7. [PMID: 26376768 DOI: 10.1002/cphc.201500806] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Indexed: 01/10/2023]
Abstract
Recent work has shown that xenon chemical shifts in cryptophane-cage sensors are affected when tethered chelators bind to metals. Here, we explore the xenon shifts in response to a wide range of metal ions binding to diastereomeric forms of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) linked to cryptophane-A. The shifts induced by the binding of Ca(2+) , Cu(2+) , Ce(3+) , Zn(2+) , Cd(2+) , Ni(2+) , Co(2+) , Cr(2+) , Fe(3+) , and Hg(2+) are distinct. In addition, the different responses of the diastereomers for the same metal ion indicate that shifts are affected by partial folding with a correlation between the expected coordination number of the metal in the DOTA complex and the chemical shift of (129) Xe. These sensors may be used to detect and quantify many important metal ions, and a better understanding of the basis for the induced shifts could enhance future designs.
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Affiliation(s)
- Keunhong Jeong
- Department of Chemistry, University of California, Berkeley, CA, 94720-1460, USA.,Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720-1460, USA
| | - Clancy C Slack
- Department of Chemistry, University of California, Berkeley, CA, 94720-1460, USA.,Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720-1460, USA
| | - Christophoros C Vassiliou
- Department of Chemistry, University of California, Berkeley, CA, 94720-1460, USA.,Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720-1460, USA
| | - Phuong Dao
- Department of Chemistry, University of California, Berkeley, CA, 94720-1460, USA.,Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720-1460, USA
| | - Muller D Gomes
- Department of Chemistry, University of California, Berkeley, CA, 94720-1460, USA.,Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720-1460, USA
| | - Daniel J Kennedy
- Department of Chemistry, University of California, Berkeley, CA, 94720-1460, USA.,Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720-1460, USA
| | - Ashley E Truxal
- Department of Chemistry, University of California, Berkeley, CA, 94720-1460, USA.,Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720-1460, USA
| | - Lindsay J Sperling
- Department of Chemistry and Biochemistry, Santa Clara University, Sata Clara, CA, 95053-0270, USA
| | - Matthew B Francis
- Department of Chemistry, University of California, Berkeley, CA, 94720-1460, USA.,Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720-1460, USA
| | - David E Wemmer
- Department of Chemistry, University of California, Berkeley, CA, 94720-1460, USA.,Physical Bioscience Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720-1460, USA
| | - Alexander Pines
- Department of Chemistry, University of California, Berkeley, CA, 94720-1460, USA. .,Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720-1460, USA.
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58
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Wojciechowski F, Groß A, Holder IT, Knörr L, Drescher M, Hartig JS. Pulsed EPR spectroscopy distance measurements of DNA internally labelled with Gd(3+)-DOTA. Chem Commun (Camb) 2015; 51:13850-3. [PMID: 26236790 DOI: 10.1039/c5cc04234h] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Gd(3+) is increasingly used in EPR spectroscopy due to its increased intracellular stability and signal-to-noise ratios. Here we present the incorporation of Gd(3+)-DOTA into internal positions in DNA. Distance measurements via pulsed Electron Paramagnetic Resonance (EPR) spectroscopy in vitro and in cellula proved enhanced stability and efficiency compared to nitroxide labels.
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Affiliation(s)
- Filip Wojciechowski
- Department of Chemistry, University of Konstanz, Universitätsstr. 10, Konstanz, Germany.
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59
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Baranyai Z, Reich D, Vágner A, Weineisen M, Tóth I, Wester HJ, Notni J. A shortcut to high-affinity Ga-68 and Cu-64 radiopharmaceuticals: one-pot click chemistry trimerisation on the TRAP platform. Dalton Trans 2015; 44:11137-46. [PMID: 25999035 DOI: 10.1039/c5dt00576k] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Due to its 3 carbonic acid groups being available for bioconjugation, the TRAP chelator (1,4,7-triazacyclononane-1,4,7-tris(methylene(2-carboxyethylphosphinic acid))) is chosen for the synthesis of trimeric bioconjugates for radiolabelling. We optimized a protocol for bio-orthogonal TRAP conjugation via Cu(I)-catalyzed Huisgen-cycloaddition of terminal azides and alkynes (CuAAC), including a detailed investigation of kinetic properties of Cu(II)-TRAP complexes. TRAP building blocks for CuAAC, TRAP(alkyne)3 and TRAP(azide)3 were obtained by amide coupling of propargylamine/3-azidopropyl-1-amine, respectively. For Cu(II) complexes of neat and triply amide-functionalized TRAP, the equilibrium properties as well as pseudo-first-order Cu(II)-transchelation, using 10 to 30 eq. of NOTA and EDTA, were studied by UV-spectrophotometry. Dissociation of any Cu(II)-TRAP species was found to be independent on the nature or excess of a competing chelator, confirming a proton-driven two-step mechanism. The respective thermodynamic stability constants (log K(ML): 19.1 and 17.6) and dissociation rates (k: 38 × 10(-6) and 7 × 10(-6) s(-1), 298 K, pH 4) show that the Cu(II) complex of the TRAP-conjugate possesses lower thermodynamic stability but higher kinetic inertness. At pH 2-3, its demetallation with NOTA was complete within several hours/days at room temperature, respectively, enabling facile Cu(II) removal after click coupling by direct addition of NOTA trihydrochloride to the CuAAC reaction mixture. Notwithstanding this, an extrapolated dissociation half life of >100 h at 37 °C and pH 7 confirms the suitability of TRAP-bioconjugates for application in Cu-64 PET (cf. t(1/2)(Cu-64) = 12.7 h). To showcase advantages of the method, TRAP(DUPA-Pep)3, a trimer of the PSMA inhibitor DUPA-Pep, was synthesized using 1 eq. TRAP(alkyne)3, 3.3 eq. DUPA-Pep-azide, 10 eq. Na ascorbate, and 1.2 eq. Cu(II)-acetate. Its PSMA affinity (IC50), determined by the competition assay on LNCaP cells, was 18-times higher than that of the corresponding DOTAGA monomer (IC50: 2 ± 0.1 vs. 36 ± 4 nM), resulting in markedly improved contrast in Ga-68-PET imaging. In conclusion, the kinetic inertness profile of Cu(II)-TRAP conjugates allows for simple Cu(II) removal after click functionalisation by means of transchelation, but also confirms their suitability for Cu-64-PET as demonstrated previously (Dalton Trans., 2012, 41, 13803).
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Affiliation(s)
- Zsolt Baranyai
- Department of Inorganic and Analytical Chemistry, University of Debrecen, Egyetem tér 1, Debrecen, H-4032, Hungary
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60
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Fodor T, Bányai I, Bényei A, Platas-Iglesias C, Purgel M, Horváth GL, Zékány L, Tircsó G, Tóth I. [Tl(III)(dota)](-): An Extraordinarily Robust Macrocyclic Complex. Inorg Chem 2015; 54:5426-37. [PMID: 25977977 DOI: 10.1021/acs.inorgchem.5b00458] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The X-ray structure of {C(NH2)3}[Tl(dota)]·H2O shows that the Tl(3+) ion is deeply buried in the macrocyclic cavity of the dota(4-) ligand (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetate) with average Tl-N and Tl-O distances of 2.464 and 2.365 Å, respectively. The metal ion is directly coordinated to the eight donor atoms of the ligand, which results in a twisted square antiprismatic (TSAP') coordination around Tl(3+). A multinuclear (1)H, (13)C, and (205)Tl NMR study combined with DFT calculations confirmed the TSAP' structure of the complex in aqueous solution, which exists as the Λ(λλλλ)/Δ(δδδδ) enantiomeric pair. (205)Tl NMR spectroscopy allowed the protonation constant associated with the protonation of the complex according to [Tl(dota)](-) + H(+) ⇆ [Tl(Hdota)] to be determined, which turned out to be pK(H)Tl(dota) = 1.4 ± 0.1. [Tl(dota)](-) does not react with Br(-), even when using an excess of the anion, but it forms a weak mixed complex with cyanide, [Tl(dota)](-) + CN(-) ⇆ [Tl(dota)(CN)](2-), with an equilibrium constant of Kmix = 6.0 ± 0.8. The dissociation of the [Tl(dota)](-) complex was determined by UV-vis spectrophotometry under acidic conditions using a large excess of Br(-), and it was found to follow proton-assisted kinetics and to take place very slowly (∼10 days), even in 1 M HClO4, with the estimated half-life of the process being in the 10(9) h range at neutral pH. The solution dynamics of [Tl(dota)](-) were investigated using (13)C NMR spectroscopy and DFT calculations. The (13)C NMR spectra recorded at low temperature (272 K) point to C4 symmetry of the complex in solution, which averages to C4v as the temperature increases. This dynamic behavior was attributed to the Λ(λλλλ) ↔ Δ(δδδδ) enantiomerization process, which involves both the inversion of the macrocyclic unit and the rotation of the pendant arms. According to our calculations, the arm-rotation process limits the Λ(λλλλ) ↔ Δ(δδδδ) interconversion.
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Affiliation(s)
| | | | | | - Carlos Platas-Iglesias
- ∥Departamento de Química Fundamental, Facultade de Ciencias, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Mihály Purgel
- ⊥MTA-DE Homogeneous Catalysis and Reaction Mechanisms Research Group, H-4032 Debrecen, Egyetem tér 1, Hungary
| | - Gábor L Horváth
- #Institute of Innate Immunity, University Hospital, University of Bonn, 53127 Bonn, Germany
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61
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Banerjee S, Pillai MRA, Knapp FFR. Lutetium-177 therapeutic radiopharmaceuticals: linking chemistry, radiochemistry, and practical applications. Chem Rev 2015; 115:2934-74. [PMID: 25865818 DOI: 10.1021/cr500171e] [Citation(s) in RCA: 157] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Sharmila Banerjee
- Radiopharmaceuticals Chemistry Section, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India.,Molecular Group of Companies, Puthuvype, Ernakulam, Kerala 682 508, India.,Medical Radioisotope Program, Oak Ridge National Laboratory (ORNL), P.O. Box 2008, 1 Bethel Valley Road, Oak Ridge, Tennessee 37830-6229, United States
| | - M R A Pillai
- Radiopharmaceuticals Chemistry Section, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India.,Molecular Group of Companies, Puthuvype, Ernakulam, Kerala 682 508, India.,Medical Radioisotope Program, Oak Ridge National Laboratory (ORNL), P.O. Box 2008, 1 Bethel Valley Road, Oak Ridge, Tennessee 37830-6229, United States
| | - F F Russ Knapp
- Radiopharmaceuticals Chemistry Section, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India.,Molecular Group of Companies, Puthuvype, Ernakulam, Kerala 682 508, India.,Medical Radioisotope Program, Oak Ridge National Laboratory (ORNL), P.O. Box 2008, 1 Bethel Valley Road, Oak Ridge, Tennessee 37830-6229, United States
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Schottelius M, Šimeček J, Hoffmann F, Willibald M, Schwaiger M, Wester HJ. Twins in spirit - episode I: comparative preclinical evaluation of [(68)Ga]DOTATATE and [(68)Ga]HA-DOTATATE. EJNMMI Res 2015; 5:22. [PMID: 25918675 PMCID: PMC4402678 DOI: 10.1186/s13550-015-0099-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Accepted: 03/17/2015] [Indexed: 12/31/2022] Open
Abstract
Background Recently, an intra-patient comparison demonstrated that the somatostatin (sst) ligand [68Ga]HA-DOTATATE ([68Ga]DOTA-3-iodo-Tyr3-octreotate) provides PET images comparable to or superior to those obtained with [68Ga]DOTATATE. To provide a comprehensive basis for nevertheless observed slight differences in tracer biodistribution and dosimetry, the characteristics of [68Ga]HA-DOTATATE were investigated in a detailed preclinical study. Methods Affinities of natGa-HA-DOTATATE and natGa-DOTATATE to sst1–5 were determined using membrane preparations and [125I]SST-28 as radioligand. Internalization into AR42J cells was studied in dual-tracer studies with [125I]TOC as internal reference. Biodistribution was investigated using AR42J tumor-bearing CD1 mice, and specificity of tracer uptake was confirmed in competition studies by coinjection of 0.8 mg TOC/kg. Results Sst2 affinities (IC50) of [natGa]HA-DOTATATE (1.4 ± 0.8 nM, logP: −3.16) and [natGa]DOTATATE (1.2 ± 0.6 nM, logP: −3.69) were nearly identical. Both compounds displayed IC50 > 1 μM for sst1,3,4, while sst5 affinity was markedly increased for natGa-HA-DOTATATE (102 ± 65 nM vs >1 μM for natGa-DOTATATE). [natLu]HA-DOTATATE and [natLu]DOTATATE showed slightly lower, identical sst2 affinities (2.0 ± 1.6 and 2.0 ± 0.8 nM, respectively) and sst3 affinities of 93 ± 1 and 162 ± 16 nM. Internalization of [68Ga]HA-DOTATATE was tenfold higher than that of [125I]TOC but only sixfold higher for [68Ga]DOTATATE and [177Lu]HA-DOTATATE. While [68Ga]HA-DOTATATE and [68Ga]DOTATATE had shown similar target- and non-target uptake in patients, biodistribution studies in mice at 1 h post injection (n = 5) revealed slightly increased non-specific uptake of [68Ga]HA-DOTATATE in the blood, liver, and intestines (0.7 ± 0.3, 1.0 ± 0.2, and 4.0 ± 0.7 %iD/g vs 0.3 ± 0.1, 0.5 ± 0.1, and 2.7 ± 0.8 %iD/g for [68Ga]DOTATATE). However, sst-mediated accumulation of [68Ga]HA-DOTATATE in the pancreas, adrenals, and tumor was significantly enhanced (36.6 ± 4.3, 10.8 ± 3.2, and 33.6 ± 10.9 %iD/g vs 26.1 ± 5.0, 5.1 ± 1.4, and 24.1 ± 4.9 %iD/g, respectively). Consequently, tumor/background ratios for [68Ga]HA-DOTATATE in the AR42J model are comparable or slightly increased compared to [68Ga]DOTATATE. Conclusions The present preclinical data fully confirm the general biodistribution pattern and excellent in vivo sst-targeting characteristics previously observed for [68Ga]HA-DOTATATE in patients. The effect of slightly enhanced lipophilicity on background accumulation and normal organ dose is compensated by the high uptake of [68Ga]HA-DOTATATE in tumor. Thus, [68Ga]HA-DOTATATE represents a fully adequate, freely available substitute for [68Ga]DOTATATE and, given the superb sst-targeting characteristics of [177Lu]HA-DOTATATE in vitro, potential applicability for sst-targeted PRRT.
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Affiliation(s)
- Margret Schottelius
- Pharmaceutical Radiochemistry, Technical University Munich, Walther-Meissner-Strasse 3, 85748 Garching, Germany
| | - Jakub Šimeček
- Pharmaceutical Radiochemistry, Technical University Munich, Walther-Meissner-Strasse 3, 85748 Garching, Germany
| | - Frauke Hoffmann
- Pharmaceutical Radiochemistry, Technical University Munich, Walther-Meissner-Strasse 3, 85748 Garching, Germany
| | - Marina Willibald
- Pharmaceutical Radiochemistry, Technical University Munich, Walther-Meissner-Strasse 3, 85748 Garching, Germany
| | - Markus Schwaiger
- Department of Nuclear Medicine, Klinikum rechts der Isar, Technical University Munich, Ismaningerstr. 22, 81675 Munich, Germany
| | - Hans-Jürgen Wester
- Pharmaceutical Radiochemistry, Technical University Munich, Walther-Meissner-Strasse 3, 85748 Garching, Germany
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Investigation of actinides(III)-DOTA complexes by electrospray ionization mass spectrometry. J Radioanal Nucl Chem 2014. [DOI: 10.1007/s10967-014-3672-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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64
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Pham TA, Xu J, Raymond KN. A Macrocyclic Chelator with Unprecedented Th4+ Affinity. J Am Chem Soc 2014; 136:9106-15. [DOI: 10.1021/ja503456r] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Tiffany A. Pham
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720-1460, United States
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460, United States
| | - Jide Xu
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720-1460, United States
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460, United States
| | - Kenneth N. Raymond
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720-1460, United States
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460, United States
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65
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Anti-L1CAM radioimmunotherapy is more effective with the radiolanthanide terbium-161 compared to lutetium-177 in an ovarian cancer model. Eur J Nucl Med Mol Imaging 2014; 41:1907-15. [PMID: 24859811 DOI: 10.1007/s00259-014-2798-3] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Accepted: 05/02/2014] [Indexed: 10/25/2022]
Abstract
PURPOSE The L1 cell adhesion molecule (L1CAM) is considered a valuable target for therapeutic intervention in different types of cancer. Recent studies have shown that anti-L1CAM radioimmunotherapy (RIT) with (67)Cu- and (177)Lu-labelled internalising monoclonal antibody (mAb) chCE7 was effective in the treatment of human ovarian cancer xenografts. In this study, we directly compared the therapeutic efficacy of anti-L1CAM RIT against human ovarian cancer under equitoxic conditions with the radiolanthanide (177)Lu and the potential alternative (161)Tb in an ovarian cancer therapy model. METHODS Tb was produced by neutron bombardment of enriched (160)Gd targets. (161)Tb and (177)Lu were used for radiolabelling of DOTA-conjugated antibodies. The in vivo behaviour of the radioimmunoconjugates (RICs) was assessed in IGROV1 tumour-bearing nude mice using biodistribution experiments and SPECT/CT imaging. After ascertaining the maximal tolerated doses (MTD) the therapeutic impact of 50 % MTD of (177)Lu- and (161)Tb-DOTA-chCE7 was evaluated in groups of ten mice by monitoring the tumour size of subcutaneous IGROV1 tumours. RESULTS The average number of DOTA ligands per antibody was 2.5 and maximum specific activities of 600 MBq/mg were achieved under identical radiolabelling conditions. RICs were stable in human plasma for at least 48 h. (177)Lu- and (161)Tb-DOTA-chCE7 showed high tumour uptake (37.8-39.0 %IA/g, 144 h p.i.) with low levels in off-target organs. SPECT/CT images confirmed the biodistribution data. (161)Tb-labelled chCE7 revealed a higher radiotoxicity in nude mice (MTD: 10 MBq) than the (177)Lu-labelled counterpart (MTD: 12 MBq). In a comparative therapy study with equitoxic doses, tumour growth inhibition was better by 82.6 % for the (161)Tb-DOTA-chCE7 than the (177)Lu-DOTA-chCE7 RIT. CONCLUSIONS Our study is the first to show that anti-L1CAM (161)Tb RIT is more effective compared to (177)Lu RIT in ovarian cancer xenografts. These results suggest that (161)Tb is a promising candidate for future clinical applications in combination with internalising antibodies.
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66
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Notni J, Šimeček J, Wester HJ. Phosphinic Acid Functionalized Polyazacycloalkane Chelators for Radiodiagnostics and Radiotherapeutics: Unique Characteristics and Applications. ChemMedChem 2014; 9:1107-15. [DOI: 10.1002/cmdc.201400055] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Indexed: 11/11/2022]
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67
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Zeglis BM, Houghton JL, Evans MJ, Viola-Villegas N, Lewis JS. Underscoring the influence of inorganic chemistry on nuclear imaging with radiometals. Inorg Chem 2014; 53:1880-99. [PMID: 24313747 PMCID: PMC4151561 DOI: 10.1021/ic401607z] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Over the past several decades, radionuclides have matured from largely esoteric and experimental technologies to indispensible components of medical diagnostics. Driving this transition, in part, have been mutually necessary advances in biomedical engineering, nuclear medicine, and cancer biology. Somewhat unsung has been the seminal role of inorganic chemistry in fostering the development of new radiotracers. In this regard, the purpose of this Forum Article is to more visibly highlight the significant contributions of inorganic chemistry to nuclear imaging by detailing the development of five metal-based imaging agents: (64)Cu-ATSM, (68)Ga-DOTATOC, (89)Zr-transferrin, (99m)Tc-sestamibi, and (99m)Tc-colloids. In a concluding section, several unmet needs both in and out of the laboratory will be discussed to stimulate conversation between inorganic chemists and the imaging community.
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Affiliation(s)
- Brian M. Zeglis
- Department of Radiology and the Program in Molecular Pharmacology and Chemistry, Memorial Sloan-Kettering Cancer Center, New York, New York, United States
| | - Jacob L. Houghton
- Department of Radiology and the Program in Molecular Pharmacology and Chemistry, Memorial Sloan-Kettering Cancer Center, New York, New York, United States
| | - Michael J. Evans
- Department of Radiology and the Program in Molecular Pharmacology and Chemistry, Memorial Sloan-Kettering Cancer Center, New York, New York, United States
| | - Nerissa Viola-Villegas
- Department of Radiology and the Program in Molecular Pharmacology and Chemistry, Memorial Sloan-Kettering Cancer Center, New York, New York, United States
| | - Jason S. Lewis
- Department of Radiology and the Program in Molecular Pharmacology and Chemistry, Memorial Sloan-Kettering Cancer Center, New York, New York, United States
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68
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Tanaka H, Yamaguchi S, Jo JI, Aoki I, Tabata Y, Takahashi T. Synthesis of a dextran-based bone tracer for in vivo magnetic resonance and optical imaging by two orthogonal coupling reactions. RSC Adv 2014. [DOI: 10.1039/c3ra46142d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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69
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Boswell CA, Marik J, Elowson MJ, Reyes NA, Ulufatu S, Bumbaca D, Yip V, Mundo EE, Majidy N, Van Hoy M, Goriparthi SN, Trias A, Gill HS, Williams SP, Junutula JR, Fielder PJ, Khawli LA. Enhanced tumor retention of a radiohalogen label for site-specific modification of antibodies. J Med Chem 2013; 56:9418-26. [PMID: 24131491 DOI: 10.1021/jm401365h] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A known limitation of iodine radionuclides for labeling and biological tracking of receptor targeted proteins is the tendency of iodotyrosine to rapidly diffuse from cells following endocytosis and lysosomal degradation. In contrast, radiometal-chelate complexes such as indium-111-1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (In-111-DOTA) accumulate within target cells due to the residualizing properties of the polar, charged metal-chelate-amino acid adduct. Iodine radionuclides boast a diversity of nuclear properties and chemical means for incorporation, prompting efforts to covalently link radioiodine with residualizing molecules. Herein, we describe the Ugi-assisted synthesis of [I-125]HIP-DOTA, a 4-hydroxy-3-iodophenyl (HIP) derivative of DOTA, and demonstration of its residualizing properties in a murine xenograft model. Overall, this study displays the power of multicomponent synthesis to yield a versatile radioactive probe for antibodies across multiple therapeutic areas with potential applications in both preclinical biodistribution studies and clinical radioimmunotherapies.
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Affiliation(s)
- C Andrew Boswell
- Genentech Research and Early Development, 1 DNA Way MS 463A , South San Francisco 94080, United States
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70
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Oehlke E, Le VS, Lengkeek N, Pellegrini P, Jackson T, Greguric I, Weiner R. Influence of metal ions on the ⁶⁸Ga-labeling of DOTATATE. Appl Radiat Isot 2013; 82:232-8. [PMID: 24056001 DOI: 10.1016/j.apradiso.2013.08.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2012] [Revised: 07/19/2013] [Accepted: 08/12/2013] [Indexed: 01/17/2023]
Abstract
The influence of metal cations (Fe³⁺, Fe²⁺, In³⁺, Cu²⁺, Ca²⁺, Al³⁺, Co²⁺, Lu³⁺, Ni²⁺, Pb²⁺, Ti⁴⁺, Y³⁺, Yb³⁺, Zn²⁺, and Zr⁴⁺) on the radiolabeling yield of [⁶⁸Ga(DOTATATE)] was evaluated. Our most important observation was that, within our experimental limit, the metal ion/ligand ratio plays a critical role on the influence of most metal ions. More in-depth studies, with Cu²⁺ and Fe³⁺, revealed that reaction temperature and concentration changes have little effect, but speciation changes with pH are crucial. Furthermore, we found that [⁶⁸Ga(DOTATATE)] is stable in the presence of high concentrations of Fe³⁺, Zn²⁺ and Pb²⁺, but transmetalates with Cu²⁺ at 95°C.
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Affiliation(s)
- Elisabeth Oehlke
- Life Sciences Division, Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, New South Wales, Australia.
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71
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Stasiuk GJ, Long NJ. The ubiquitous DOTA and its derivatives: the impact of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid on biomedical imaging. Chem Commun (Camb) 2013; 49:2732-46. [PMID: 23392443 DOI: 10.1039/c3cc38507h] [Citation(s) in RCA: 151] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Over the last twenty-five years 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) has made a significant impact on the field of diagnostic imaging. DOTA is not the only metal chelate in use in medical diagnostics, but it is the only one to significantly impact on all of the major imaging modalities Magnetic Resonance (MR), Positron Emission Tomography (PET), Single Photon Emission Computed Tomography (SPECT), and Fluorescence imaging. This crossover of modalities has been possible due to the versatility of DOTA firstly, to complex a variety of metal ions and secondly, the ease with which it can be modified for different disease states. This has driven research over the last two decades into the chemistry of DOTA and the modification of the substituent pendant arms of this macrocycle to create functional, targeted and dual-modal imaging agents. The primary use of DOTA has been with the lanthanide series of metals, gadolinium for MRI, europium and terbium for fluorescence and neodymium for near infra-red imaging. There are now many research groups dedicated to the use of lanthanides with DOTA although other chelates such as DTPA and NOTA are being increasingly employed. The ease with which DOTA can be conjugated to peptides has given rise to targeted imaging agents seen in the PET, SPECT and radiotherapy fields. These modalities use a variety of radiometals that complex with DOTA, e.g.(64)Cu and (68)Ga which are used in clinical PET scans, (111)In, and (90)Y for SPECT and radiotherapy. In this article, we will demonstrate the remarkable versatility of DOTA, how it has crossed the imaging modality boundaries and how it has been successfully transferred into the clinic.
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Affiliation(s)
- Graeme J Stasiuk
- Department of Chemistry, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
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72
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Joyner JC, Cowan JA. Target-directed catalytic metallodrugs. Braz J Med Biol Res 2013; 46:465-85. [PMID: 23828584 PMCID: PMC3854446 DOI: 10.1590/1414-431x20133086] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Accepted: 03/11/2013] [Indexed: 01/08/2023] Open
Abstract
Most drugs function by binding reversibly to specific biological targets, and therapeutic effects generally require saturation of these targets. One means of decreasing required drug concentrations is incorporation of reactive metal centers that elicit irreversible modification of targets. A common approach has been the design of artificial proteases/nucleases containing metal centers capable of hydrolyzing targeted proteins or nucleic acids. However, these hydrolytic catalysts typically provide relatively low rate constants for target inactivation. Recently, various catalysts were synthesized that use oxidative mechanisms to selectively cleave/inactivate therapeutic targets, including HIV RRE RNA or angiotensin converting enzyme (ACE). These oxidative mechanisms, which typically involve reactive oxygen species (ROS), provide access to comparatively high rate constants for target inactivation. Target-binding affinity, co-reactant selectivity, reduction potential, coordination unsaturation, ROS products (metal-associated vs metal-dissociated; hydroxyl vs superoxide), and multiple-turnover redox chemistry were studied for each catalyst, and these parameters were related to the efficiency, selectivity, and mechanism(s) of inactivation/cleavage of the corresponding target for each catalyst. Important factors for future oxidative catalyst development are 1) positioning of catalyst reduction potential and redox reactivity to match the physiological environment of use, 2) maintenance of catalyst stability by use of chelates with either high denticity or other means of stabilization, such as the square planar geometric stabilization of Ni- and Cu-ATCUN complexes, 3) optimal rate of inactivation of targets relative to the rate of generation of diffusible ROS, 4) targeting and linker domains that afford better control of catalyst orientation, and 5) general bio-availability and drug delivery requirements.
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Affiliation(s)
- J C Joyner
- Evans Laboratory of Chemistry, Ohio State University, Columbus, OH 43210, USA.
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73
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Šimeček J, Hermann P, Havlíčková J, Herdtweck E, Kapp TG, Engelbogen N, Kessler H, Wester HJ, Notni J. A cyclen-based tetraphosphinate chelator for the preparation of radiolabeled tetrameric bioconjugates. Chemistry 2013; 19:7748-57. [PMID: 23613345 DOI: 10.1002/chem.201300338] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Indexed: 01/17/2023]
Abstract
The cyclen-based tetraphosphinate chelator 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrakis[methylene(2-carboxyethyl)phosphinic acid] (DOTPI) comprises four additional carboxylic acid moieties for bioconjugation. The thermodynamic stability constants (logK(ML)) of metal complexes, as determined by potentiometry, were 23.11 for Cu(II), 20.0 for Lu(III), 19.6 for Y(III), and 21.0 for Gd(III). DOTPI was functionalized with four cyclo(Arg-Gly-Asp-D-Phe-Lys) (RGD) peptides through polyethylene glycol (PEG4) linkers. The resulting tetrameric conjugate DOTPI(RGD)4 was radiolabeled with (177)Lu and (64)Cu and showed improved labeling efficiency compared with 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA). The labeled compounds were fully stable in transchelation challenges against trisodium diethylenetriaminepentaacetate (DTPA) and disodium ethylenediaminetetraacetic acid (ETDA), in phosphate buffered saline (PBS), and human plasma. Integrin αvβ3 affinities of the non-radioactive Lu(III) and Cu(II) complexes of DOTPI(RGD)4 were 18 times higher (both IC50 about 70 picomolar) than that of the c(RGDfK) peptide (IC50 = 1.3 nanomolar). Facile access to tetrameric conjugates and the possibility of radiolabeling with therapeutic and diagnostic radionuclides render DOTPI suitable for application in peptide receptor radionuclide imaging (PRRI) and therapy (PRRT).
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Affiliation(s)
- Jakub Šimeček
- Lehrstuhl für Pharmazeutische Radiochemie, Technische Universität München, Walther-Meissner Strasse 3, 85748 Garching, Germany
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74
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Pouessel J, Abada S, Le Bris N, Elhabiri M, Charbonnière LJ, Tripier R. A new bis-tetraamine ligand with a chromophoric 4-(9-anthracenyl)-2,6-dimethylpyridinyl linker for glyphosate and ATP sensing. Dalton Trans 2013; 42:4859-72. [PMID: 23370614 DOI: 10.1039/c3dt32325k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of a new linear bis-tetraamine ligand L1, based on two 1,4,8,11-tetraazaundecane units grafted at the 2 and 6 positions of a pyridinyl linker substituted by an anthracenyl fluorophore in the para position, is described and anion complexation studies of L1 with anionic substrates are reported. The protonation pattern and the study of the binding properties of L1 in an aqueous medium with two anionic substrates, the nucleotide adenosine triphosphate (ATP) and the herbicide glyphosate (N-(phosphonomethyl)glycine, PMG), were investigated by means of potentiometry, NMR spectroscopy and absorption and emission spectroscopic techniques. To decipher the impact of the chromophoric linker on the complexation process and to highlight its optical properties, a comparison is established with its previously reported analog L2 devoid of the anthracenyl group. The results unambiguously show that the protonation and complexation properties are preserved despite the presence of the bulky linker, allowing for the use of L1 as a fluorescent sensor for ATP and PMG.
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Affiliation(s)
- Jacky Pouessel
- Laboratoire de Chimie, Electrochimie Moléculaires et Chimie Analytique, UMR 6521 CNRS/Université de Bretagne Occidentale, 6 Avenue Victor Le Gorgeu, 29238 Brest Cedex 3, France
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75
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Joyner JC, Keuper KD, Cowan JA. Kinetics and Mechanisms of Oxidative Cleavage of HIV RRE RNA by Rev-Coupled Transition Metal Chelates. Chem Sci 2013; 4:1707-1718. [PMID: 23626900 PMCID: PMC3634708 DOI: 10.1039/c3sc22135k] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Catalytic metallodrugs were used to oxidatively cleave HIV-1 Rev Response Element RNA (RRE RNA), and the mechanisms of RNA cleavage were studied using a combination of matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF MS), fluorescence spectroscopy, and gel electrophoresis. The metallodrugs, which contained combinations of the transition metals Fe2+, Co2+, Ni2+, and Cu2+ and the Rev-coupled chelators DOTA, DTPA, EDTA, NTA, tripeptide GGH, and tetrapeptide KGHK, bind to and cleave HIV RRE RNA through heretofore unknown oxidative mechanisms. The broad spectrum of metal catalysts and co-reagents provided a means for systematic variation of oxidative reactivity without significant perturbation of binding between catalyst and RNA. Detailed MS analyses were used to monitor formation of RNA fragments containing terminal 2',3'-cyclic phosphate (2',3'-cPO4), 3'-phosphate (3'-PO4), 3'-phosphoglycolate (3'-PG), 5'- hydroxyl (5'-OH), 5'- phosphate (5'-PO4) and other nascent overhangs at sites of cleavage. The distinct overhangs corresponded to distinct mechanisms of oxidative hydrogen-abstraction (H abstraction), hydrolysis, and/or endonucleolysis, allowing a dissection of the contributions of various mechanisms of oxidative cleavage. Rapid co-reactant- and catalyst-dependent formation of fragments containing terminal 3'-PG, 3'-PO4 and 5'-PO4 overhangs appeared to be initiated primarily by H abstraction events. The standard thiobarbituric acid (TBA) assay was employed herein in a novel usage to monitor the formation of base 2-hydroxypropenal products produced by 4'-H abstraction in RNA. Formation of an adduct with TBA was monitored by fluorescence, and its quantification correlated with the formation of 3'-PG monitored by MALDI-TOF MS, confirming oxidative 4'-H abstraction as a major mechanism of rapid catalyst-mediated cleavage of RRE RNA. Rapid formation of 3'-PO4 overhangs was most likely a result of 5'-H abstraction. Apparent rates of formation of 3'-PG (a unique product of 4'-H abstraction) at differing nucleotide positions within the RNA were used to triangulate probable 3D positions of metal centers and establish the distance-dependence of 4'-H abstraction for certain catalytic metallodrugs.
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Affiliation(s)
- Jeff C. Joyner
- Evans Laboratory of Chemistry, Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210
- The Ohio State Biochemistry Program, 784 Biological Sciences 484 W. 12th Avenue, Columbus, Ohio 43210
| | - Kevin D. Keuper
- Evans Laboratory of Chemistry, Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210
| | - J. A. Cowan
- Evans Laboratory of Chemistry, Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210
- The Ohio State Biochemistry Program, 784 Biological Sciences 484 W. 12th Avenue, Columbus, Ohio 43210
- MetalloPharm LLC, 1790 Riverstone Drive, Delaware, OH 43015
- The Ohio State University Center for RNA Biology
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Maria L, Santos IC, Alves LG, Marçalo J, Martins AM. Rare earth metal complexes anchored on a new dianionic bis(phenolate)dimethylamineCyclam ligand. J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2012.12.026] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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77
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Chang CA, Lee HY, Chen CL. Simulated annealing and density functional theoretical prediction of macrocyclic ligand conformations, protonation sites and complex metal–ligand exchange reaction directions. Dalton Trans 2013; 42:6397-409. [DOI: 10.1039/c3dt32113d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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78
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Šimeček J, Hermann P, Wester HJ, Notni J. How is68Ga Labeling of Macrocyclic Chelators Influenced by Metal Ion Contaminants in68Ge/68Ga Generator Eluates? ChemMedChem 2012; 8:95-103. [DOI: 10.1002/cmdc.201200471] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Indexed: 01/14/2023]
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79
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Shinoda S. Dynamic cyclen-metal complexes for molecular sensing and chirality signaling. Chem Soc Rev 2012; 42:1825-35. [PMID: 23034678 DOI: 10.1039/c2cs35295h] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Structural dynamism plays important roles in artificial and biological systems, because it controls structures and functions of various molecules and assemblies. In this review, molecular recognition and self-assembling behavior of dynamic armed cyclen-metal complexes are discussed at the molecular and supramolecular levels. These metal complexes provide useful platforms for molecular receptors, supramolecules, and molecular assemblies that can respond rapidly to guest molecules and environments. Since armed cyclens have many structural and geometrical variations, they form a wide variety of metal complexes having specific sensing and signaling functions. The Lewis acidity of the metal cations plays an essential role in anion binding and in hydrolytic catalysis of phosphate esters. Characteristic luminescence and magnetic properties of lanthanides also enable techniques for effective bio-imaging. They also serve as chiral building blocks for self-assembled architectures, which offer chirality integration effective for chirality sensing and signaling at the supramolecular level.
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Affiliation(s)
- Satoshi Shinoda
- Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan.
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80
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Pouessel J, Le Bris N, Bencini A, Giorgi C, Valtancoli B, Tripier R. Glyphosate and ATP binding by mononuclear Zn(II) complexes with non-symmetric ditopic polyamine ligands. Dalton Trans 2012; 41:10521-32. [PMID: 22785253 DOI: 10.1039/c2dt31110k] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Binding of Zn(II) by the ditopic ligands L1py, L2py and L1para, composed of a cyclam unit linked to the linear polyamines 1,4,8,11-tetraazaundecane (L1py and L2para) and 1,4,7-triazaheptane (L2py) via a 2,6-dimethylpyridinyl (L1py and L2py) or a 1,4-dimethylbenzyl spacer (L2para), has been analyzed by means of potentiometric and (1)H and (13)C NMR measurements. All ligands form stable mononuclear Zn(II) complexes in a wide pH range, featuring the metal ion bound to the macrocyclic unit. The open-chain polyamine unit can easily bind several protons in aqueous solution affording protonated metal complexes at neutral and acidic pH values. These complexes behave as bifunctional receptors for the anionic substrates N-(phosphonomethyl)glycine (glyphosate or PMG) and ATP. Potentiometric, (1)H and (31)P NMR measurements show that the Zn(II) complex with L1py is the better receptor for both substrates, thanks to the simultaneous presence of a pyridine linker functionalized at its 2,6 positions and of a flexible linear tetraamine chain. In fact, these structural features allow a stronger interaction of PMG and ATP with both the protonated tetraamine moiety and the Zn(II)-cyclam core.
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Affiliation(s)
- Jacky Pouessel
- Université de Bretagne Occidentale, UMR-CNRS 6521, UFR Sciences et Techniques, 6 Avenue Victor Le Gorgeu, C.S. 93837, 29238 Brest Cedex 3, France
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44Sc-DOTA-BN[2-14]NH2 in comparison to 68Ga-DOTA-BN[2-14]NH2 in pre-clinical investigation. Is 44Sc a potential radionuclide for PET? Appl Radiat Isot 2012; 70:2669-76. [PMID: 23037921 DOI: 10.1016/j.apradiso.2012.08.004] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2011] [Revised: 08/07/2012] [Accepted: 08/08/2012] [Indexed: 11/22/2022]
Abstract
AIM In the present study we demonstrate the in vitro and in vivo comparison of the (44)Sc and (68)Ga labeled DOTA-BN[2-14]NH(2). (44)Sc is a positron emitter with a half life of 3.92 h. Hence it could be used for PET imaging with ligands requiring longer observation time than in the case of (68)Ga. METHODS The binding affinity of (nat)Sc-DOTA-BN[2-14]NH(2) and (nat)Ga-DOTA-BN[2-14]NH(2) to GRP receptors was studied in competition to [(125)I-Tyr(4)]-Bombesin in the human prostate cancer cell line PC-3. A preliminary biodistribution in normal rats was performed, while first microPET images were assessed in male Copenhagen rats bearing the androgen-independent Dunning R-3327-AT-1 prostate cancer tumor. RESULTS The affinity to GRP receptors in the PC-3 cell line was higher for (nat)Ga-DOTA-BN[2-14]NH(2) (IC(50)(nM)=0.85 ± 0.06) than that of (nat)Sc-DOTA-BN[2-14]NH(2) (IC(50) (nM)=6.49 ± 0.13). The internalization rate of (68)Ga labeled DOTA-BN[2-14]NH(2) was slower than that of (44)Sc, but their final internalization percents were comparable. (68)Ga-DOTA-BN[2-14]NH(2) was externalized faster than (44)Sc-DOTA-BN[2-14]NH(2). The biodistribution of (44)Sc-DOTA-BN[2-14]NH(2) and (68)Ga-DOTA-BN[2-14]NH(2) in normal rats revealed a higher uptake in target organs and tissues of the first one while both excreted mainly through urinary tract. In microPET images both tracers were accumulated in the tumor with similar uptake patterns. CONCLUSIONS Despite the differences in the receptor affinity both the (68)Ga- and the (44)Sc-labeled DOTA-BN[2-14]NH(2) tracers showed comparable distribution and similar time constants of uptake and elimination. Moreover no differences in tumor accumulation (neither in the overall uptake nor in the dynamics) were observed from the microPet imaging. From that perspective the use of either (44)Sc or (68)Ga for detecting tumors with GRP receptors is equivalent.
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82
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Kim H, Kang SG, Kwak CH. Synthesis, crystal structures, and deprotonation of cis- and trans-octahedral nickel(II) complexes with a 14-membered tetraaza macrocycle bearing two N-phenacyl pendant arms. Inorganica Chim Acta 2012. [DOI: 10.1016/j.ica.2012.02.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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83
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Magnetic Anisotropy in a Dysprosium/DOTA Single-Molecule Magnet: Beyond Simple Magneto-Structural Correlations. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201107453] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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84
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Cucinotta G, Perfetti M, Luzon J, Etienne M, Car PE, Caneschi A, Calvez G, Bernot K, Sessoli R. Magnetic Anisotropy in a Dysprosium/DOTA Single-Molecule Magnet: Beyond Simple Magneto-Structural Correlations. Angew Chem Int Ed Engl 2012; 51:1606-10. [DOI: 10.1002/anie.201107453] [Citation(s) in RCA: 482] [Impact Index Per Article: 40.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2011] [Indexed: 11/10/2022]
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85
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Riss PJ, Burchardt C, Zimny MJ, Peters J, Roesch F. A concise synthesis procedure to furnish multi-gram amounts of hexadentate, bivalent DO2A-based chelators. RSC Adv 2012. [DOI: 10.1039/c2ra20931d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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86
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Joyner JC, Keuper KD, Cowan JA. DNA nuclease activity of Rev-coupled transition metal chelates. Dalton Trans 2012; 41:6567-78. [DOI: 10.1039/c2dt00026a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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87
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Influence of cations on the complexation yield of DOTATATE with yttrium and lutetium: a perspective study for enhancing the 90Y and 177Lu labeling conditions. Nucl Med Biol 2011; 39:509-17. [PMID: 22172388 DOI: 10.1016/j.nucmedbio.2011.10.015] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2011] [Revised: 09/14/2011] [Accepted: 10/22/2011] [Indexed: 11/21/2022]
Abstract
The DOTA macrocyclic ligand can form stable complexes with many cations besides yttrium and lutetium. For this reason, the presence of competing cationic metals in yttrium-90 and lutetium-177 chloride solutions can dramatically influence the radiolabeling yield. The aim of this study was to evaluate the coordination yield of yttrium- and lutetium-DOTATATE complexes when the reaction is performed in the presence of varying amounts of competing cationic impurities. In the first set of experiments, the preparation of the samples was performed by using natural yttrium and lutetium (20.4 nmol). The molar ratio between DOTATATE and these metals was 1 to 1. Metal competitors (Pb(2+), Zn(2+), Cu(2+), Fe(3+), Al(3+), Ni(2+), Co(2+), Cr(3+)) were added separately to obtain samples with varying molar ratio with respect to yttrium or lutetium (0.1, 0.5, 1, 2 and 10). The final solutions were analyzed through ultra high-performance liquid chromatography with an UV detector. In the second set of experiments, an amount of (90)Y or (177)Lu chloride (6 MBq corresponding to 3.3 and 45 pmol, respectively) was added to the samples, and a radio-thin layer chromatography analysis was carried out. The coordination of Y(3+) and Lu(3+) was dramatically influenced by low levels of Zn(2+), Cu(2+) and Co(2+). Pb(2+) and Ni(2+) were also shown to be strong competitors at higher concentrations. Fe(3+) was expected to be a strong competitor, but the effect on the incorporation was only partly dependent on its concentration. Al(3+) and Cr(3+) did not compete with Y(3+) and Lu(3+) in the formation of DOTATATE complexes.
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88
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Jeong GR, Kang SG, Jeong JH. Synthesis of C-meso and/or C-racemic isomers of tetraaza macrocyclic copper(II) and nickel(II) complexes bearing one or two N-CH2OCH3 pendant arms. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.09.036] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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89
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Pouessel J, Le Bris N, Bencini A, Giorgi C, Handel H, Tripier R. Selective Binding of Glyphosate by a Ditopic Cyclic-Open-Chain Polyazaligand in Aqueous Solution. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100972] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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90
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Zhu X, Wong W, Wong W, Yang X. Design and Synthesis of Near‐Infrared Emissive Lanthanide Complexes Based on Macrocyclic Ligands. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100481] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xunjin Zhu
- Institute of Molecular Functional Materials (Areas of Excellence Scheme University Grants Committee, Hong Kong) and Department of Chemistry and Centre for Advanced Luminescence Materials, Hong Kong Baptist University, Waterloo Road, Hong Kong, P. R. China
| | - Wai‐Kwok Wong
- Institute of Molecular Functional Materials (Areas of Excellence Scheme University Grants Committee, Hong Kong) and Department of Chemistry and Centre for Advanced Luminescence Materials, Hong Kong Baptist University, Waterloo Road, Hong Kong, P. R. China
| | - Wai‐Yeung Wong
- Institute of Molecular Functional Materials (Areas of Excellence Scheme University Grants Committee, Hong Kong) and Department of Chemistry and Centre for Advanced Luminescence Materials, Hong Kong Baptist University, Waterloo Road, Hong Kong, P. R. China
| | - Xiaoping Yang
- Department of Chemistry and Biochemistry, The University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712‐0165, USA, Fax: +1‐852‐3411‐7348
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91
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Joyner JC, Reichfield J, Cowan JA. Factors influencing the DNA nuclease activity of iron, cobalt, nickel, and copper chelates. J Am Chem Soc 2011; 133:15613-26. [PMID: 21815680 DOI: 10.1021/ja2052599] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A library of complexes that included iron, cobalt, nickel, and copper chelates of cyclam, cyclen, DOTA, DTPA, EDTA, tripeptide GGH, tetrapeptide KGHK, NTA, and TACN was evaluated for DNA nuclease activity, ascorbate consumption, superoxide and hydroxyl radical generation, and reduction potential under physiologically relevant conditions. Plasmid DNA cleavage rates demonstrated by combinations of each complex and biological co-reactants were quantified by gel electrophoresis, yielding second-order rate constants for DNA(supercoiled) to DNA(nicked) conversion up to 2.5 × 10(6) M(-1) min(-1), and for DNA(nicked) to DNA(linear) up to 7 × 10(5) M(-1) min(-1). Relative rates of radical generation and characterization of radical species were determined by reaction with the fluorescent radical probes TEMPO-9-AC and rhodamine B. Ascorbate turnover rate constants ranging from 3 × 10(-4) to 0.13 min(-1) were determined, although many complexes demonstrated no measurable activity. Inhibition and Freifelder-Trumbo analysis of DNA cleavage supported concerted cleavage of dsDNA by a metal-associated reactive oxygen species (ROS) in the case of Cu(2+)(aq), Cu-KGHK, Co-KGHK, and Cu-NTA and stepwise cleavage for Fe(2+)(aq), Cu-cyclam, Cu-cyclen, Co-cyclen, Cu-EDTA, Ni-EDTA, Co-EDTA, Cu-GGH, and Co-NTA. Reduction potentials varied over the range from -362 to +1111 mV versus NHE, and complexes demonstrated optimal catalytic activity in the range of the physiological redox co-reactants ascorbate and peroxide (-66 to +380 mV).
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Affiliation(s)
- Jeff C Joyner
- Evans Laboratory of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
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92
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Kim HJ, Kang SG. Synthesis and Characterization of New Mono-N-functionalized Tetraaza Macrocyclic Nickel(II) and Copper(II) Complexes. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.8.2565] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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93
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Zeglis BM, Lewis JS. A practical guide to the construction of radiometallated bioconjugates for positron emission tomography. Dalton Trans 2011; 40:6168-95. [PMID: 21442098 PMCID: PMC3773488 DOI: 10.1039/c0dt01595d] [Citation(s) in RCA: 151] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Positron emission tomography (PET) has become a vital imaging modality in the diagnosis and treatment of disease, most notably cancer. A wide array of small molecule PET radiotracers have been developed that employ the short half-life radionuclides (11)C, (13)N, (15)O, and (18)F. However, PET radiopharmaceuticals based on biomolecular targeting vectors have been the subject of dramatically increased research in both the laboratory and the clinic. Typically based on antibodies, oligopeptides, or oligonucleotides, these tracers have longer biological half-lives than their small molecule counterparts and thus require labeling with radionuclides with longer, complementary radioactive half-lives, such as the metallic isotopes (64)Cu, (68)Ga, (86)Y, and (89)Zr. Each bioconjugate radiopharmaceutical has four component parts: biomolecular vector, radiometal, chelator, and covalent link between chelator and biomolecule. With the exception of the radiometal, a tremendous variety of choices exists for each of these pieces, and a plethora of different chelation, conjugation, and radiometallation strategies have been utilized to create agents ranging from (68)Ga-labeled pentapeptides to (89)Zr-labeled monoclonal antibodies. Herein, the authors present a practical guide to the construction of radiometal-based PET bioconjugates, in which the design choices and synthetic details of a wide range of biomolecular tracers from the literature are collected in a single reference. In assembling this information, the authors hope both to illuminate the diverse methods employed in the synthesis of these agents and also to create a useful reference for molecular imaging researchers both experienced and new to the field.
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Affiliation(s)
- Brian M. Zeglis
- Department of Radiology and Program in Molecular Pharmacology and Chemistry Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA. Fax: (646)-888-3039; Tel: (646)-888-3038
| | - Jason S. Lewis
- Department of Radiology and Program in Molecular Pharmacology and Chemistry Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA. Fax: (646)-888-3039; Tel: (646)-888-3038
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94
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Joyner JC, Cowan JA. Targeted cleavage of HIV RRE RNA by Rev-coupled transition metal chelates. J Am Chem Soc 2011; 133:9912-22. [PMID: 21585196 DOI: 10.1021/ja203057z] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A series of compounds that target reactive metal chelates to the HIV-1 Rev response element (RRE) mRNA have been synthesized. Dissociation constants and chemical reactivity toward HIV RRE RNA have been determined and evaluated in terms of reduction potential, coordination unsaturation, and overall charge associated with the metal-chelate-Rev complex. Ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), diethylenetriaminepentaacetic acid (DTPA), and 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) were linked to a lysine side chain of a Rev-derived peptide by either EDC/NHS or isothiocyanate coupling. The resulting chelate-Rev (EDTA-Rev, DTPA-Rev, NTA-Rev, and DOTA-Rev) conjugates were used to form coordination complexes with Fe(2+), Co(2+), Ni(2+), and Cu(2+) such that the arginine-rich Rev peptide could mediate localization of the metal chelates to the Rev peptide's high-affinity mRNA binding partner, RRE stem loop IIB. Metal complexes of the extended peptides GGH-Rev and KGHK-Rev, which also contain N-terminal peptidic chelators (ATCUN motifs), were studied for comparison. A fluorescence titration assay revealed high-affinity RRE RNA binding by all 22 metal-chelate-Rev species, with K(D) values ranging from ~0.2 to 16 nM, indicating little to no loss of RNA affinity due to the coupling of the metal chelates to the Rev peptide. Dissociation constants for binding at a previously unobserved low-affinity site are also reported. Rates of RNA modification by each metal-chelate-Rev species were determined and varied from ~0.28 to 4.9 nM/min but were optimal for Cu(2+)-NTA-Rev. Metal-chelate reduction potentials were determined and varied from -228 to +1111 mV vs NHE under similar solution conditions, allowing direct comparison of reactivity with redox thermodynamics. Optimal activity was observed when the reduction potential for the metal center was poised between those of the two principal co-reagents for metal-promoted formation of reactive oxygen species: E°(ascorbate/ascorbyl radical) = -66 mV and E°(H(2)O(2)/hydroxyl radical) = 380 mV. Given the variety of oxidative activities of these metal complexes and their high-affinity binding to the targeted RRE mRNA following coupling to the Rev peptide, this class of metal-chelate-Rev derivatives constitutes a promising step toward development of multiple-turnover reagents for selective eradication of HIV-1 RRE mRNA.
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Affiliation(s)
- Jeff C Joyner
- Evans Laboratory of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, USA
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95
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Jiang ZX, Feng Y, Yu YB. Fluorinated paramagnetic chelates as potential multi-chromic 19F tracer agents. Chem Commun (Camb) 2011; 47:7233-5. [PMID: 21617807 DOI: 10.1039/c1cc11150g] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A class of potential multi-chromic (19)F imaging tracers is made by pairing metal ions with a fluorinated chelator. All fluorinated metal chelates emit a single (19)F signal. Paramagnetic metal ions shifted the (19)F signal frequency and made the (19)F relaxation rates insensitive toward local chemical environment.
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Affiliation(s)
- Zhong-Xing Jiang
- Department of Pharmaceutical Sciences, University of Maryland, Baltimore, MD 21201, USA
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96
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Di Bari L, Salvadori P. Static and Dynamic Stereochemistry of Chiral Ln DOTA Analogues. Chemphyschem 2011; 12:1490-7. [DOI: 10.1002/cphc.201100017] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2011] [Revised: 03/18/2011] [Indexed: 11/11/2022]
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97
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Bernier N, Costa J, Delgado R, Félix V, Royal G, Tripier R. trans-Methylpyridine cyclen versus cross-bridged trans-methylpyridine cyclen. Synthesis, acid-base and metal complexation studies (metal = Co2+, Cu2+, and Zn2+). Dalton Trans 2011; 40:4514-26. [PMID: 21409259 DOI: 10.1039/c0dt01191f] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of the cross-bridged cyclen CRpy(2) {4,10-bis((pyridin-2-yl)methyl)-1,4,7,10-tetraazabicyclo[5.5.2]tetradecane}, a constrained analogue of the previously described trans-methylpyridine cyclen Cpy(2) is reported. The additional ethylene bridge confers to CRpy(2) proton-sponge type behaviour which was explored by NMR and potentiometric studies. Transition metal complexes have been synthesized (by complexation of both ligands with Co(2+), Cu(2+) and Zn(2+)) and characterized in solution and in the solid state. The single crystal X-ray structures of [CoCpy(2)](2+), [CuCpy(2)](2+) and [ZnCpy(2)](2+) complexes were determined. Stability constants of the complexes, including those of the cross-bridged derivative, were determined using potentiometric titration data and the kinetic inertness of the [CuCRpy(2)](2+) complex in an acidic medium (half-life values) was evaluated by spectrophotometry. The pre-organized structure of the cross-bridged ligand imposes an additional strain for the complexation leading to complexes with smaller thermodynamic stability in comparison with the related non-bridged ligand. The electrochemical study involving cyclic voltammetry underlines the importance of the ethylene cross-bridge on the redox properties of the transition metal complexes.
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Affiliation(s)
- Nicolas Bernier
- Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. da República, 2780-157, Oeiras, Portugal
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98
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Szalay PS, Zeller M, Hunter AD. 2,2'-[4,10-Bis(carb-oxy-meth-yl)-4,10-diaza-1,7-diazo-niacyclo-dodecane-1,7-di-yl]diacetate dihydrate. Acta Crystallogr Sect E Struct Rep Online 2011; 67:o644. [PMID: 21522397 PMCID: PMC3052104 DOI: 10.1107/s1600536811004843] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2010] [Accepted: 02/08/2011] [Indexed: 11/25/2022]
Abstract
In the title compound, C16H28N4O8·2H2O, the 12-membered macrocycle has twofold crystallographic symmetry and the asymmetric unit comprises one half-molecule. The four carboxyl/carboxylate groups reside on the same side of the macrocycle. The molecule is a double zwitterion with two of the carboxylic acid H atoms transferred to the two N atoms on the opposite sides of the macrocycle, resulting in both N atoms having positive charges and leaving the two resulting carboxylate groups with negative charges. The two remaining carboxylic acid groups and the carboxylate groups form O—H⋯O hydrogen bonds with the crystal water molecules. The H atoms bound to the N atoms within the macrocyle are engaged in two equivalent hydrogen bonds with the adjacent N atoms.
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99
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Car PE, Perfetti M, Mannini M, Favre A, Caneschi A, Sessoli R. Giant field dependence of the low temperature relaxation of the magnetization in a dysprosium(iii)–DOTA complex. Chem Commun (Camb) 2011; 47:3751-3. [DOI: 10.1039/c0cc05850e] [Citation(s) in RCA: 192] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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100
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Saito S, Nakano Y, Hikichi A, Suzuki R, Yoshimoto K, Maeda M, Aoyama M, Shibukawa M. Ultrasensitive CE for heavy metal ions using the variations in the chemical structures formed from new octadentate fluorescent probes and cationic polymers. Analyst 2011; 136:2697-705. [DOI: 10.1039/c0an00777c] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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