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Wong AAWL, Lozada J, Lepage ML, Zhang C, Merkens H, Zeisler J, Lin KS, Bénard F, Perrin DM. Synthesis and 18F-radiolabeling of thymidine AMBF 3 conjugates. RSC Med Chem 2020; 11:569-576. [PMID: 33479658 PMCID: PMC7578706 DOI: 10.1039/d0md00054j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 04/09/2020] [Indexed: 01/08/2023] Open
Abstract
In pursuit of 18F-labeled nucleosides for positron emission tomography (PET) imaging, we report on the chemical and radiochemical synthesis of two thymidine (dT) analogs, dT-C5-AMBF3 and dT-N3-AMBF3, that are radiofluorinated by isotope exchange (IEX) and studied as PET imaging agents in mice with tumor xenografts. dT-C5-AMBF3 shows preferential, and tumor-specific, uptake over dT-N3-AMBF3. This work provides a new synthetic method in order to access new nucleoside tracers for PET imaging.
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Affiliation(s)
- Antonio A W L Wong
- Department of Chemistry , University of British Columbia (UBC) , 2036 Main Mall , Vancouver , BC , V6T 1Z1 Canada .
| | - Jerome Lozada
- Department of Chemistry , University of British Columbia (UBC) , 2036 Main Mall , Vancouver , BC , V6T 1Z1 Canada .
| | - Mathieu L Lepage
- Department of Chemistry , University of British Columbia (UBC) , 2036 Main Mall , Vancouver , BC , V6T 1Z1 Canada .
| | - Chengcheng Zhang
- Department of Molecular Oncology , B.C. Cancer Research Centre (BCCRC) , 675 West 10th Avenue , Vancouver , BC , V5Z 1L3 Canada
| | - Helen Merkens
- Department of Molecular Oncology , B.C. Cancer Research Centre (BCCRC) , 675 West 10th Avenue , Vancouver , BC , V5Z 1L3 Canada
| | - Jutta Zeisler
- Department of Molecular Oncology , B.C. Cancer Research Centre (BCCRC) , 675 West 10th Avenue , Vancouver , BC , V5Z 1L3 Canada
| | - Kuo-Shyan Lin
- Department of Molecular Oncology , B.C. Cancer Research Centre (BCCRC) , 675 West 10th Avenue , Vancouver , BC , V5Z 1L3 Canada
| | - François Bénard
- Department of Molecular Oncology , B.C. Cancer Research Centre (BCCRC) , 675 West 10th Avenue , Vancouver , BC , V5Z 1L3 Canada
| | - David M Perrin
- Department of Chemistry , University of British Columbia (UBC) , 2036 Main Mall , Vancouver , BC , V6T 1Z1 Canada .
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Abstract
Single photon emission computed tomography (SPECT) is the state-of-the-art imaging modality in nuclear medicine despite the fact that only a few new SPECT tracers have become available in the past 20 years. Critical for the future success of SPECT is the design of new and specific tracers for the detection, localization, and staging of a disease and for monitoring therapy. The utility of SPECT imaging to address oncologic questions is dependent on radiotracers that ideally exhibit excellent tissue penetration, high affinity to the tumor-associated target structure, specific uptake and retention in the malignant lesions, and rapid clearance from non-targeted tissues and organs. In general, a target-specific SPECT radiopharmaceutical can be divided into two main parts: a targeting biomolecule (e.g., peptide, antibody fragment) and a γ-radiation-emitting radionuclide (e.g., 99mTc, 123I). If radiometals are used as the radiation source, a bifunctional chelator is needed to link the radioisotope to the targeting entity. In a rational SPECT tracer design, these single components have to be critically evaluated in order to achieve a balance among the demands for adequate target binding, and a rapid clearance of the radiotracer. The focus of this chapter is to depict recent developments of tumor-targeted SPECT radiotracers for imaging of cancer diseases. Possibilities for optimization of tracer design and potential causes for design failure are discussed and highlighted with selected examples.
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Duan X, Ruan Q, Gan Q, Song X, Fang S, Zhang X, Zhang J. Radiosynthesis and evaluation of novel 99mTc(CO)3-labelled thymidine dithiocarbamate derivatives for tumor imaging with SPECT. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.05.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Duan X, Gan Q, Song X, Fang S, Zhang X, Ruan Q, Zhang J. Synthesis and biological evaluation of novel 99m
Tc-oxo and 99m
Tc-tricarbonyl complexes with C3′-functionalized thymidine dithiocarbamate for tumor imaging. Appl Organomet Chem 2018. [DOI: 10.1002/aoc.4424] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Xiaojiang Duan
- Key Laboratory of Radiopharmaceuticals of Ministry of Education, College of Chemistry; Beijing Normal University; Beijing 100875 China
| | - Qianqian Gan
- Key Laboratory of Radiopharmaceuticals of Ministry of Education, College of Chemistry; Beijing Normal University; Beijing 100875 China
| | - Xiaoqing Song
- Key Laboratory of Radiopharmaceuticals of Ministry of Education, College of Chemistry; Beijing Normal University; Beijing 100875 China
| | - Si'an Fang
- Key Laboratory of Radiopharmaceuticals of Ministry of Education, College of Chemistry; Beijing Normal University; Beijing 100875 China
| | - Xuran Zhang
- Key Laboratory of Radiopharmaceuticals of Ministry of Education, College of Chemistry; Beijing Normal University; Beijing 100875 China
- Department of Isotopes; China Institute of Atomic Energy; P. O. Box 2108 Beijing 102413 China
| | - Qing Ruan
- Key Laboratory of Radiopharmaceuticals of Ministry of Education, College of Chemistry; Beijing Normal University; Beijing 100875 China
| | - Junbo Zhang
- Key Laboratory of Radiopharmaceuticals of Ministry of Education, College of Chemistry; Beijing Normal University; Beijing 100875 China
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Duan X, Zhang X, Gan Q, Fang S, Ruan Q, Song X, Zhang J. Novel 99mTc-labelled complexes with thymidine isocyanide: radiosynthesis and evaluation as potential tumor imaging tracers. MEDCHEMCOMM 2018; 9:705-712. [PMID: 30108961 PMCID: PMC6071732 DOI: 10.1039/c7md00635g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Accepted: 02/27/2018] [Indexed: 01/11/2023]
Abstract
A novel thymidine isocyanide (CN-TdR) functionalized at the N3 position of thymidine was synthesized and then radiolabelled with 99mTc(i) and [99mTc(i)(CO)3]+ cores to produce [99mTc(CN-TdR)6]+ and [99mTc(CO)3(CN-TdR)3]+, respectively. Both of them were prepared with high radiochemical purity and were stable over 6 h in saline at ambient temperature and in serum at 37 °C. The partition coefficient results demonstrated that they were hydrophilic. The cell internalization studies showed that their uptake might be mediated by nucleoside transporters. Biodistribution of these complexes in mice bearing the S180 tumor showed that they accumulated in the tumor with high uptake and cleared rapidly from blood and muscles, producing high tumor/blood and tumor/muscle ratios. Between them, [99mTc(CN-TdR)6]+ exhibited advantages concerning a higher tumor uptake, tumor/blood ratio and tumor/muscle ratio at 60 min post-injection. Single photon emission computed tomography imaging studies showed that there was a clear accumulation in tumor sites, suggesting that [99mTc(CN-TdR)6]+ could be a promising candidate for tumor imaging.
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Affiliation(s)
- Xiaojiang Duan
- Key Laboratory of Radiopharmaceuticals , Ministry of Education , College of Chemistry , Beijing Normal University , Beijing 100875 , P.R. China .
| | - Xuran Zhang
- Key Laboratory of Radiopharmaceuticals , Ministry of Education , College of Chemistry , Beijing Normal University , Beijing 100875 , P.R. China .
- Department of Isotopes , China Institute of Atomic Energy , P. O. Box 2108 , Beijing 102413 , P.R. China
| | - Qianqian Gan
- Key Laboratory of Radiopharmaceuticals , Ministry of Education , College of Chemistry , Beijing Normal University , Beijing 100875 , P.R. China .
| | - Si'an Fang
- Key Laboratory of Radiopharmaceuticals , Ministry of Education , College of Chemistry , Beijing Normal University , Beijing 100875 , P.R. China .
| | - Qing Ruan
- Key Laboratory of Radiopharmaceuticals , Ministry of Education , College of Chemistry , Beijing Normal University , Beijing 100875 , P.R. China .
| | - Xiaoqing Song
- Key Laboratory of Radiopharmaceuticals , Ministry of Education , College of Chemistry , Beijing Normal University , Beijing 100875 , P.R. China .
| | - Junbo Zhang
- Key Laboratory of Radiopharmaceuticals , Ministry of Education , College of Chemistry , Beijing Normal University , Beijing 100875 , P.R. China .
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Lee JY, Lee SY, Kim GG, Hur MG, Yang SD, Park JH, Kim SW. Development of 68Ga-SCN-DOTA-Capsaicin as an Imaging Agent Targeting Apoptosis and Cell Cycle Arrest in Breast Cancer. Cancer Biother Radiopharm 2017; 32:169-175. [PMID: 28598691 DOI: 10.1089/cbr.2017.2186] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
68Ga-labeled capsaicin using a DOTA (1,4,7,10-tetraazocyclododecane-N,N',N″,N'″-tetraacetic acid) derivative [68Ga-SCN-Benzyl(Bn)-DOTA-capsaicin] was studied for the diagnosis of breast cancers, such as MCF-7 and SK-BR-3. The standard compound, 69Ga-SCN-Bn-DOTA-capsaicin, was also prepared and characterized by spectroscopic analysis. The binding affinity of 68Ga-SCN-Bn-DOTA-capsaicin was evaluated by using breast cancer cell lines (MCF-7, SK-BR-3) and colon cancer cell (CT-26); the biodistribution was carried out by using MCF-7-bearing nude mice, after which the positron emission tomography (PET) images were obtained at different time intervals (15-120 minutes). 68Ga-SCN-Bn-DOTA-capsaicin showed a cellular uptake of 0.93% Injected Dose (ID) after 30 minutes of incubation, whereas 68Ga-SCN-Bn-DOTA showed a lower uptake of 0.25% ID. The tumor-to-blood ID/g% ratios increased and were found to be 0.49, 0.22, and 0.77 for 15, 30, and 60 minutes, respectively. The small-animal PET study showed that the uptake of 68Ga-SCN-Bn-DOTA-capsaicin was higher in the tumor regions even at 30 minutes after injection. These results suggest that 68Ga-SCN-Bn-DOTA-capsaicin is a potential targeting agent for PET imaging of MCF-7.
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Affiliation(s)
- Jun Young Lee
- 1 Radiation Instrumentation Research Division, Korea Atomic Energy Research Institute , Jeongeup, Republic of Korea
| | - Sang-Yeun Lee
- 1 Radiation Instrumentation Research Division, Korea Atomic Energy Research Institute , Jeongeup, Republic of Korea
| | - Gun Gyun Kim
- 1 Radiation Instrumentation Research Division, Korea Atomic Energy Research Institute , Jeongeup, Republic of Korea.,2 Department of Advanced Materials Chemistry, College of Science and Technology, Dongguk University , Gyeongju, Republic of Korea
| | - Min Goo Hur
- 1 Radiation Instrumentation Research Division, Korea Atomic Energy Research Institute , Jeongeup, Republic of Korea
| | - Seung Dae Yang
- 1 Radiation Instrumentation Research Division, Korea Atomic Energy Research Institute , Jeongeup, Republic of Korea
| | - Jeong-Hoon Park
- 1 Radiation Instrumentation Research Division, Korea Atomic Energy Research Institute , Jeongeup, Republic of Korea
| | - Sang Wook Kim
- 2 Department of Advanced Materials Chemistry, College of Science and Technology, Dongguk University , Gyeongju, Republic of Korea
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Synthesis and Biological Evaluation of Novel (99m)Tc(CO)₃-Labeled Thymidine Analogs as Potential Probes for Tumor Proliferation Imaging. Molecules 2016; 21:510. [PMID: 27104501 PMCID: PMC6274394 DOI: 10.3390/molecules21040510] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Revised: 04/07/2016] [Accepted: 04/12/2016] [Indexed: 11/25/2022] Open
Abstract
Achieving a 99mTc labeled thymidine radiotracer for single photon emission tomography (SPECT) is considered to be of interest. In this study, four novel thymidine analogs, 6a, 6b, 6c and 6d, were successfully synthesized via “click reaction” route and then radiolabeled using a [99mTc(CO)3]+ core to prepare the corresponding 99mTc(CO)3 complexes in high yields. These complexes were hydrophilic and had good in vitro stability. Biodistribution of these complexes in mice bearing S180 tumors showed that all of them exhibited accumulation in the tumors, suggesting that they would be potential tumor imaging agents.
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Koszytkowska-Stawińska M, Buchowicz W. Multicomponent reactions in nucleoside chemistry. Beilstein J Org Chem 2014; 10:1706-32. [PMID: 25161730 PMCID: PMC4142899 DOI: 10.3762/bjoc.10.179] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Accepted: 07/02/2014] [Indexed: 12/17/2022] Open
Abstract
This review covers sixty original publications dealing with the application of multicomponent reactions (MCRs) in the synthesis of novel nucleoside analogs. The reported approaches were employed for modifications of the parent nucleoside core or for de novo construction of a nucleoside scaffold from non-nucleoside substrates. The cited references are grouped according to the usually recognized types of the MCRs. Biochemical properties of the novel nucleoside analogs are also presented (if provided by the authors).
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Affiliation(s)
| | - Włodzimierz Buchowicz
- Faculty of Chemistry, Warsaw University of Technology, ul. Noakowskiego 3, 00-664 Warszawa, Poland
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Kilian K. 68Ga-DOTA and analogs: Current status and future perspectives. Rep Pract Oncol Radiother 2014; 19:S13-S21. [PMID: 28443194 DOI: 10.1016/j.rpor.2014.04.016] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Revised: 03/28/2014] [Accepted: 04/23/2014] [Indexed: 12/18/2022] Open
Abstract
The construction of the 68Ge/68Ga generator has increased application of radiopharmaceuticals labeled with this isotope in medicine. 68Ga-PET is widely employed in the management of neuroendocrine tumors but favorable chemistry with tri- and tetraaza-ring molecules has opened wide range of 68Ga application in other fields of PET imaging. This review covers the radiopharmaceuticals labeled with gallium in molecular imaging and shows perspectives on the use of gallium-68 as a substitute for technetium-99, fluorine-18 and carbon-11 in some applications.
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Affiliation(s)
- Krzysztof Kilian
- Heavy Ion Laboratory, University of Warsaw, Pasteur 5a, 02093 Warsaw, Poland
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10
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Abstract
The compound class of 3-carboranyl thymidine analogues (3CTAs) are boron delivery agents for boron neutron capture therapy (BNCT), a binary treatment modality for cancer. Presumably, these compounds accumulate selectively in tumor cells via intracellular trapping, which is mediated by hTK1. Favorable in vivo biodistribution profiles of 3CTAs led to promising results in preclinical BNCT of rats with intracerebral brain tumors. This review presents an overview on the design, synthesis, and biological evaluation of first- and second-generation 3CTAs. Boronated nucleosides developed prior to 3CTAs for BNCT and non-boronated N3-substituted thymidine conjugates for other areas of cancer therapy and imaging are also described. In addition, basic features of carborane clusters, which are used as boron moieties in the design and synthesis of 3CTAs, and the biological and structural features of TK1-like enzymes, which are the molecular targets of 3CTAs, are discussed.
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Abstract
Single photon emission computed tomography (SPECT) is the state-of-the-art imaging modality in nuclear medicine despite the fact that only a few new SPECT tracers have become available in the past 20 years. Critical for the future success of SPECT is the design of new and specific tracers for the detection, localization, and staging of a disease and for monitoring therapy. The utility of SPECT imaging to address oncologic questions is dependent on radiotracers that ideally exhibit excellent tissue penetration, high affinity to the tumor-associated target structure, specific uptake and retention in the malignant lesions, and rapid clearance from non-targeted tissues and organs. In general, a target-specific SPECT radiopharmaceutical can be divided into two main parts: a targeting biomolecule (e.g. peptide, antibody fragment) and a γ-radiation emitting radionuclide (e.g. (99m)Tc, (123)I). If radiometals are used as the radiation source, a bifunctional chelator is needed to link the radioisotope to the targeting entity. In a rational SPECT tracer design these single components have to be critically evaluated in order to achieve a balance among the demands for adequate target binding, and a rapid clearance of the radiotracer. The focus of this chapter is to depict recent developments of tumor-targeted SPECT radiotracers for imaging of cancer diseases. Possibilities for optimization of tracer design and potential causes for design failure are discussed and highlighted with selected examples.
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Affiliation(s)
- Cristina Müller
- Center for Radiopharmaceutical Sciences ETH-PSI-USZ, Paul Scherrer Institute, Villigen-PSI, Switzerland.
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A quinazoline-derivative DOTA-type gallium(III) complex for targeting epidermal growth factor receptors: synthesis, characterisation and biological studies. J Biol Inorg Chem 2008; 14:261-71. [DOI: 10.1007/s00775-008-0446-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2008] [Accepted: 10/14/2008] [Indexed: 01/27/2023]
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Desbouis D, Struthers H, Spiwok V, Küster T, Schibli R. Synthesis, In Vitro, and In Silico Evaluation of Organometallic Technetium and Rhenium Thymidine Complexes with Retained Substrate Activity toward Human Thymidine Kinase Type 1. J Med Chem 2008; 51:6689-98. [PMID: 18837546 DOI: 10.1021/jm800530p] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dominique Desbouis
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland, Center for Radiopharmaceutical Science, ETH-PSI-USZ, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland, Department of Structure and Function of Saccharides, Institute of Chemistry, Slovak Academy of Sciences, Dubravska Cesta 9, 84538 Bratislava, Slovak Republic
| | - Harriet Struthers
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland, Center for Radiopharmaceutical Science, ETH-PSI-USZ, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland, Department of Structure and Function of Saccharides, Institute of Chemistry, Slovak Academy of Sciences, Dubravska Cesta 9, 84538 Bratislava, Slovak Republic
| | - Vojtech Spiwok
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland, Center for Radiopharmaceutical Science, ETH-PSI-USZ, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland, Department of Structure and Function of Saccharides, Institute of Chemistry, Slovak Academy of Sciences, Dubravska Cesta 9, 84538 Bratislava, Slovak Republic
| | - Tatiana Küster
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland, Center for Radiopharmaceutical Science, ETH-PSI-USZ, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland, Department of Structure and Function of Saccharides, Institute of Chemistry, Slovak Academy of Sciences, Dubravska Cesta 9, 84538 Bratislava, Slovak Republic
| | - Roger Schibli
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland, Center for Radiopharmaceutical Science, ETH-PSI-USZ, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland, Department of Structure and Function of Saccharides, Institute of Chemistry, Slovak Academy of Sciences, Dubravska Cesta 9, 84538 Bratislava, Slovak Republic
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Celen S, de Groot T, Balzarini J, Vunckx K, Terwinghe C, Vermaelen P, Van Berckelaer L, Vanbilloen H, Nuyts J, Mortelmans L, Verbruggen A, Bormans G. Synthesis and evaluation of a 99mTc-MAMA-propyl-thymidine complex as a potential probe for in vivo visualization of tumor cell proliferation with SPECT. Nucl Med Biol 2007; 34:283-91. [PMID: 17383578 DOI: 10.1016/j.nucmedbio.2007.01.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2006] [Revised: 12/18/2006] [Accepted: 01/05/2007] [Indexed: 11/22/2022]
Abstract
INTRODUCTION Cytosolic thymidine kinase (TK1) catalyzes phosphorylation of thymidine to its monophosphate. TK1 activity is closely related with DNA synthesis, and thymidine analogs derivatized with bulky carboranylalkyl groups at the N-3 position were reported to be good substrates for TK1. Accordingly, we have synthesized (99m)Tc-MAMA-propyl-thymidine and evaluated it as a potential tumor tracer. METHODS The bis(S-trityl)-protected MAMA-propyl-thymidine precursor (3-N-[S-trityl-2-mercaptoethyl]-N-[N'-(S-trityl-2-mercaptoethyl)amidoacetyl]-aminopropyl-thymidine) was prepared in three steps, and its structure was confirmed with (1)H NMR and mass spectrometry. Deprotection of the thiols and labeling with (99m)Tc were done in a two-step, one-pot procedure, yielding (99m)Tc-MAMA-propyl-thymidine, which was analyzed with high-performance liquid chromatography, radio-LC-MS analysis (ESI+) and electrophoresis, and its log P was determined. The biodistribution in normal mice was evaluated, and its biodistribution in a radiation-induced fibrosarcoma (RIF) tumor mouse was compared with that of 3'-deoxy-3'-[(18)F] fluorothymidine [(18)F]FLT. RESULTS (99m)Tc-MAMA-propyl-thymidine was obtained with a radiochemical yield of 70%. Electrophoresis indicated that the complex is uncharged, and its log P was 1.0. The molecular ion mass of the Tc complex was 589 Da, which is compatible with the hypothesized N(2)S(2)-oxotechnetium structure. Tissue distribution showed fast clearance from plasma primarily by the hepatobiliary pathway. Whole-body planar imaging after injection of (99m)Tc-MAMA-propyl-thymidine in an RIF tumor-bearing mouse showed high uptake in the liver and the intestines. No uptake was observed in the tumor, in contrast to the clear uptake observed for [(18)F] FLT visualized with muPET. CONCLUSIONS Although it has been reported that TK1 accepts large substituents at the N-3 position of the thymine ring, the results of this study show that (99m)Tc-MAMA-propyl-thymidine cannot be used as a single photon emission computed tomography tumor tracer, probably because the (99m)Tc-MAMA ligand is too bulky to be tolerated by TK1.
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Affiliation(s)
- Sofie Celen
- Laboratory for Radiopharmacy, K.U. Leuven, B-3000 Leuven, Belgium
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Tjarks W, Tiwari R, Byun Y, Narayanasamy S, Barth RF. Carboranyl thymidine analogues for neutron capture therapy. Chem Commun (Camb) 2007:4978-91. [DOI: 10.1039/b707257k] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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