1
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Park JY, Cho YL, Lee TS, Lee D, Kang JH, Lim S, Lee Y, Lim JH, Kang WJ. In Vivo Evaluation of 68Ga-Labeled NOTA-EGFRvIII Aptamer in EGFRvIII-Positive Glioblastoma Xenografted Model. Pharmaceutics 2024; 16:814. [PMID: 38931935 PMCID: PMC11207964 DOI: 10.3390/pharmaceutics16060814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2024] [Revised: 06/05/2024] [Accepted: 06/13/2024] [Indexed: 06/28/2024] Open
Abstract
EGFRvIII is expressed only in tumor cells and strongly in glioblastoma and is considered a promising target in cancer diagnosis and therapy. Aptamers are synthetic single-stranded oligonucleotides that bind to biochemical target molecules with high binding affinity and specificity. This study examined the potential of the 68Ga-NOTA-EGFRvIII aptamer as a nuclear imaging probe for visualizing EGFRvIII-expressing glioblastoma by positron emission tomography (PET). EGFRvIII aptamer was selected using the SELEX technology, and flow cytometry and fluorescence microscopy verified the high binding affinity to EGFRvIII positive U87MG vIII 4.12 glioma cells but not to EGFRvIII negative U87MG cells. The EGFRvIII aptamer was conjugated with a chelator (1,4,7-triazanonane-1,4,7-triyl)triacetic acid (NOTA) for 68Ga-labeling. The 68Ga-NOTA-EGFRvIII aptamer was prepared using the preconcentration-based labeling method with a high radiolabeling yield at room temperature. Ex vivo biodistribution analyses confirmed the significantly higher tumor uptake of the 68Ga-NOTA-EGFRvIII aptamer in EGFRvIII-expressing xenograft tumors than that in EGFRvIII negative tumors, confirming the specific tumor uptake of the 68Ga-NOTA-EGFRvIII aptamer in vivo. PET imaging studies revealed a high retention rate of the 68Ga-NOTA-EGFRvIII aptamer in U87MG vIII 4.12 tumors but only low uptake levels in U87-MG tumors, suggesting that the 68Ga-NOTA-EGFRvIII aptamer may be used as a PET imaging agent for EGFRvIII-expressing glioblastoma.
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Affiliation(s)
- Jun Young Park
- Department of Nuclear Medicine, Severance Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea; (J.Y.P.); (Y.L.C.)
| | - Ye Lim Cho
- Department of Nuclear Medicine, Severance Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea; (J.Y.P.); (Y.L.C.)
| | - Tae Sup Lee
- Division of RI Application, Korea Institute of Radiological and Medical Science (KIRAMS), Seoul 01812, Republic of Korea; (T.S.L.); (J.H.L.)
| | - Daekyun Lee
- Aptamer Sciences Inc., Pangyo Seven Venture Valley 1 (3-dong), 15, Pangyo-ro 228 beon-gil, Bundang-gu, Seongnam-si 13487, Republic of Korea; (D.L.); (J.-H.K.); (S.L.); (Y.L.)
| | - Ju-Hyung Kang
- Aptamer Sciences Inc., Pangyo Seven Venture Valley 1 (3-dong), 15, Pangyo-ro 228 beon-gil, Bundang-gu, Seongnam-si 13487, Republic of Korea; (D.L.); (J.-H.K.); (S.L.); (Y.L.)
| | - Soryong Lim
- Aptamer Sciences Inc., Pangyo Seven Venture Valley 1 (3-dong), 15, Pangyo-ro 228 beon-gil, Bundang-gu, Seongnam-si 13487, Republic of Korea; (D.L.); (J.-H.K.); (S.L.); (Y.L.)
| | - Yujin Lee
- Aptamer Sciences Inc., Pangyo Seven Venture Valley 1 (3-dong), 15, Pangyo-ro 228 beon-gil, Bundang-gu, Seongnam-si 13487, Republic of Korea; (D.L.); (J.-H.K.); (S.L.); (Y.L.)
| | - Jae Hyun Lim
- Division of RI Application, Korea Institute of Radiological and Medical Science (KIRAMS), Seoul 01812, Republic of Korea; (T.S.L.); (J.H.L.)
| | - Won Jun Kang
- Department of Nuclear Medicine, Severance Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea; (J.Y.P.); (Y.L.C.)
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2
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Wu W, Qin Z, Duan X, Qiu Y, Tang W, Xiong C, Shao ZW, Xiong L, Dai Z, Liu C. Structural Diversity in Ga/In-Hydroxamate Metal-Organic Materials. Inorg Chem 2024; 63:10414-10422. [PMID: 38772007 DOI: 10.1021/acs.inorgchem.4c01494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/23/2024]
Abstract
Developing metal-organic materials (MOMs) with chemical robustness is a prerequisite to exploring their intriguing properties and applications. As part of a continuing effort to construct robust MOMs featuring chelated building units, here we introduce a "bent" thiophene-2,5-dihydroxamate ligand with multiple intrinsic conformations when it is used as a chelating linkage. This approach should further diversify the coordination chemistry in hydroxamate-based MOM structures without compromising the stability. In combination with Group 13 metals Ga/In to ensure homoleptic metal vertices, we report the successful crystallization of four MOMs with diverse structures and dimensionalities: SUM-81 as a 0D metal-organic polyhedron (MOP), SUM-82 as a 2D MOF with an fes topology, SUM-83 and SUM-84 as distinct 1D coordination polymers with shapes mimic stairs and mesh tubes, respectively. As these structures indeed contain the aforementioned different ligand conformations and combinations thereof, these results expand our understanding of the coordination chemistry of hydroxamates. To demonstrate the potential applicability of hydroxamate-chelated robust MOMs, the permanently porous SUM-81 MOP was successfully incorporated in a series of mixed matrix membranes for CO2/N2 separation, showing impressive performances.
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Affiliation(s)
- Wenjing Wu
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Zikang Qin
- School of Carbon Neutrality Future Technology, Sichuan University, Chengdu 610065, China
| | - Xiangping Duan
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Yuqing Qiu
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Wenlei Tang
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Chaozhi Xiong
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Zhen-Wu Shao
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Li Xiong
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Zhongde Dai
- School of Carbon Neutrality Future Technology, Sichuan University, Chengdu 610065, China
| | - Chong Liu
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
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3
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Khorshidi A. Chemical radioanalysis of production of positron-emitting radioisotope Gallium-68 via (p,n) and (p,2n) reactions using compact cyclotron for tomography applications. Heliyon 2024; 10:e31499. [PMID: 38813197 PMCID: PMC11133935 DOI: 10.1016/j.heliyon.2024.e31499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 05/16/2024] [Accepted: 05/16/2024] [Indexed: 05/31/2024] Open
Abstract
In this study, the proton-induced reactions of 68Zn and 69Ga aimed at generating 68Ga were simulated and modeled using Talys code and neural network software. In the first step, both targets were simulated under different proton energies and at different bombardments times to generate a total of six thousand data. Then, the obtained data from the Talys, including the various cross-sections, contaminations, the main product i.e. 68Ga, and other options were completely saved in the output file. Afterwards, the inputs of the neural network were selected from the output of the Talys by analyzing and considering most of the key features. A total of four inputs, two of which are different energies related to the reaction, the other is the process sequence and the fourth input is the bombardment time, were recognized as suitable inputs and the model was trained differently depending on the type of target. The selected model was a feed-forward neural network with 5 nodes in a middle layer, which was able to estimate the output of Talys code by changing the input parameters with extremely high accuracy. Two different models including the main model for estimating the output of the main sample (product) and the sub-model for estimating process pollution or impurity were trained, and then the trained model was tested on the deduced process data. The implementation results fully demonstrated the high accuracy of the method. The neural network model is much easier to implement than the Talys code, and its execution speed is very high. In addition, it can be used appropriately as a system alternative for optimization and different structures in medical and biological engineering.
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Affiliation(s)
- Abdollah Khorshidi
- School of Paramedical, Gerash University of Medical Sciences, Gerash, Iran
- Soleimani Maktab, Central Branch, Qaem University, Kerman, Iran
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Rubira L, Donzé C, Fouillet J, Algudo B, Kotzki PO, Deshayes E, Fersing C. [ 68Ga]Ga-FAPI-46 synthesis on a GAIA® module system: Thorough study of the automated radiolabeling reaction conditions. Appl Radiat Isot 2024; 206:111211. [PMID: 38309117 DOI: 10.1016/j.apradiso.2024.111211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 01/19/2024] [Accepted: 01/25/2024] [Indexed: 02/05/2024]
Abstract
The influence of several parameters involved in the 68Ga radiolabeling of FAPI-46 was studied at the scale of the automated reaction. Among the buffers tested, HEPES 0.3 M pH 4 allowed both high radiochemical purity (RCP) and radiochemical yield (RCY), without prepurification of 68Ga but after final purification of [68Ga]Ga-FAPI-46 on a C18 cartridge. A longer reaction time did not show significant benefit on the RCP, while higher loads of FAPI-46 and gentisic acid as anti-radiolysis compound allowed better RCY.
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Affiliation(s)
- Léa Rubira
- Nuclear medicine department, Institut régional du Cancer de Montpellier (ICM), Univ. Montpellier, Montpellier, France
| | - Charlotte Donzé
- Nuclear medicine department, Institut régional du Cancer de Montpellier (ICM), Univ. Montpellier, Montpellier, France
| | - Juliette Fouillet
- Nuclear medicine department, Institut régional du Cancer de Montpellier (ICM), Univ. Montpellier, Montpellier, France
| | - Benjamin Algudo
- Nuclear medicine department, Institut régional du Cancer de Montpellier (ICM), Univ. Montpellier, Montpellier, France
| | - Pierre Olivier Kotzki
- Nuclear medicine department, Institut régional du Cancer de Montpellier (ICM), Univ. Montpellier, Montpellier, France; Institut de Recherche en Cancérologie de Montpellier (IRCM), INSERM U1194, Univ. Montpellier, Institut régional du Cancer de Montpellier (ICM), Montpellier, France
| | - Emmanuel Deshayes
- Nuclear medicine department, Institut régional du Cancer de Montpellier (ICM), Univ. Montpellier, Montpellier, France; Institut de Recherche en Cancérologie de Montpellier (IRCM), INSERM U1194, Univ. Montpellier, Institut régional du Cancer de Montpellier (ICM), Montpellier, France
| | - Cyril Fersing
- Nuclear medicine department, Institut régional du Cancer de Montpellier (ICM), Univ. Montpellier, Montpellier, France; IBMM, Univ Montpellier, CNRS, ENSCM, Montpellier, France.
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5
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Hoerres R, Hennkens HM. 1,4,7-Triazacyclononane-Based Chelators for the Complexation of [ 186Re]Re- and [ 99mTc]Tc-Tricarbonyl Cores. Inorg Chem 2023; 62:20688-20698. [PMID: 37683190 PMCID: PMC10732151 DOI: 10.1021/acs.inorgchem.3c01934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Indexed: 09/10/2023]
Abstract
Metal complexes with the general formula [MI(CO)3(k3-L)]+, where M = Re, 186Re, or 99mTc and L = 1,4,7-triazacyclononane (TACN), NOTA, or NODAGA chelators, have previously been conjugated to peptide-based biological targeting vectors and investigated as potential theranostic radiopharmaceuticals. The promising results demonstrated by these bioconjugate complexes prompted our exploration of other TACN-based chelators for suitability for (radio)labeling with the [M(CO)3]+ core. In this work, we investigated the role of the TACN pendant arms in complexation of the [M(CO)3]+ core through (radio)labeling of TACN chelators bearing acid, ester, mixed acid-ester, or no pendant functional groups. The chelators were synthesized from TACN, characterized, and (radio)labeled with nonradioactive Re-, [186Re]Re-, and [99mTc]Tc-tricarbonyl cores. The nonfunctionalized (3), diacid (4), and monoacid monoester (7 and 8) chelators underwent direct labeling, while the diester (M-5 and M-6) complexes required indirect synthesis from M-4. All six chelators demonstrated stable radiometal coordination. The ester-bearing derivatives, which exhibited more lipophilic character than their acid-bearing counterparts, were prone to ester hydrolysis over time, making them less suitable for radiopharmaceutical development. These studies confirmed that the TACN pendant functional groups were key to efficient labeling with the [M(CO)3]+ core, with ionizable pendant arms favored over nonionizable pendant arms.
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Affiliation(s)
- Rebecca Hoerres
- Department
of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
| | - Heather M. Hennkens
- Department
of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
- Research
Reactor Center, University of Missouri, Columbia, Missouri 65211, United States
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6
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Zhao Q, Yan J, Wang J, Liu R, Bartlam M. Structural analysis of the ferric-binding protein KfuA from Klebsiella pneumoniae. Biochem Biophys Res Commun 2023; 679:52-57. [PMID: 37669596 DOI: 10.1016/j.bbrc.2023.08.068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Accepted: 08/31/2023] [Indexed: 09/07/2023]
Abstract
Iron acquisition is an essential process of cell physiology for biological systems. In Klebsiella pneumoniae, the siderophore and ferric-acquisition ABC (ATP-Binding-Cassette) transporter KfuABC is utilized for iron uptake. Initial recognition of the various ferric sources in periplasm and transportation across the cytoplasmic membrane is performed by the substrate-binding protein (SBP) KfuA. Here we report the 2.0 Å resolution crystal structure of KfuA from K. pneumoniae, which crystallizes in the space group P1211 with a single monomer in the asymmetric unit. A bound metal ion reveals the residues required for binding ferric ions. Binding analysis shows that ferric iron and the iron-mimicking gallium bind with high affinity to KfuA. Growth curves show that gallium inhibits growth of K. pneumoniae whereas ferric iron enhances it. This work suggests a mechanism whereby gallium effectively competes with ferric iron, disrupting iron-dependent biological functions via binding to KfuA and leading to heightened antimicrobial efficacy. Significantly, humans lack equivalent ABC transporters like SBP KfuA, underscoring the potential of KfuA as an attractive target for therapeutic intervention.
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Affiliation(s)
- Qi Zhao
- College of Life Sciences, Nankai University, Tianjin, 300071, China; State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, 300071, China
| | - Jiaqi Yan
- College of Life Sciences, Nankai University, Tianjin, 300071, China; State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, 300071, China
| | - Jingjing Wang
- College of Life Sciences, Nankai University, Tianjin, 300071, China; State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, 300071, China
| | - Ruihua Liu
- College of Life Sciences, Nankai University, Tianjin, 300071, China; State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, 300071, China.
| | - Mark Bartlam
- College of Life Sciences, Nankai University, Tianjin, 300071, China; State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, 300071, China; Nankai International Advanced Research Institute (Shenzhen Futian), Nankai University, Tianjin, 300071, China.
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7
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Leenhardt J, Biguet Petit Jean A, Raes F, N'Guessan E, Debiossat M, André C, Bacot S, Ahmadi M, de Leiris N, Djaileb L, Ghezzi C, Brunet MD, Broisat A, Perret P, du Moulinet d'Hardemare A. TrisOxine abiotic siderophores for technetium complexation: radiolabeling and biodistribution studies. EJNMMI Radiopharm Chem 2023; 8:32. [PMID: 37856008 PMCID: PMC10587049 DOI: 10.1186/s41181-023-00214-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 10/03/2023] [Indexed: 10/20/2023] Open
Abstract
BACKGROUND Despite the development of positron emission tomography (PET), single photon emission computed tomography (SPECT) still accounts for around 80% of all examinations performed in nuclear medicine departments. The search for new radiotracers or chelating agents for Technetium-99m is therefore still ongoing. O-TRENSOX and O-TRENOX two synthetic siderophores would be good candidates for this purpose as they are hexadentate ligands based on the very versatile and efficient 8-hydroxyquinoline chelating subunit. First, the radiolabeling of O-TRENOX and O-TRENSOX with 99mTc was investigated. Different parameters such as the quantity of chelating agent, type of reducing agent, pH and temperature of the reaction mixture were adjusted in order to find the best radiolabeling conditions. Then an assessment of the partition coefficient by measuring the distribution of each radiosynthesized complex between octanol and phosphate-buffered saline was realized. The complex's charge was evaluated on three different celluloses (neutral, negatively charged P81 and positively charged DE81), and finally in vivo studies with biodistribution and SPECT imaging of [99mTc]Tc-O-TRENOX and [99mTc]Tc-O-TRENSOX were performed. RESULTS The radiolabeling studies showed a rapid and efficient complexation of 99mTc with both chelating agents. Using tin pyrophosphate as the reducing agent and a minimum of 100 nmol of ligand, we obtained the [99mTc]Tc-O-TRENOX complex with a radiochemical purity of more than 98% and the [99mTc]Tc-O-TRENSOX complex with one above 97% at room temperature within 5 min. [99mTc]Tc-O-TRENOX complex was lipophilic and neutral, leading to a hepatobiliary elimination in mice. On the contrary, the [99mTc]Tc-O-TRENSOX complex was found to be hydrophilic and negatively charged. This was confirmed by a predominantly renal elimination in mice. CONCLUSIONS These encouraging results allow us to consider the O-TRENOX/99mTc and O-TRENSOX/99mTc complexes as serious candidates for SPECT imaging chelators. This study should be continued by conjugating these tris-oxine ligands to peptides or antibodies and comparing them with the other bifunctional agents used with Tc.
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Affiliation(s)
- Julien Leenhardt
- Université Grenoble Alpes, INSERM, CHU Grenoble Alpes, LRB, 38000, Grenoble, France.
- Université Grenoble Alpes, Department of Molecular Chemistry, Saint Martin d'Hères, France.
| | | | - Florian Raes
- Université Grenoble Alpes, INSERM, CHU Grenoble Alpes, LRB, 38000, Grenoble, France
| | - Emilien N'Guessan
- Université Grenoble Alpes, INSERM, CHU Grenoble Alpes, LRB, 38000, Grenoble, France
| | - Marlène Debiossat
- Université Grenoble Alpes, INSERM, CHU Grenoble Alpes, LRB, 38000, Grenoble, France
| | - Clémence André
- Université Grenoble Alpes, INSERM, CHU Grenoble Alpes, LRB, 38000, Grenoble, France
| | - Sandrine Bacot
- Université Grenoble Alpes, INSERM, CHU Grenoble Alpes, LRB, 38000, Grenoble, France
| | - Mitra Ahmadi
- Université Grenoble Alpes, INSERM, CHU Grenoble Alpes, LRB, 38000, Grenoble, France
| | - Nicolas de Leiris
- Université Grenoble Alpes, INSERM, CHU Grenoble Alpes, LRB, 38000, Grenoble, France
| | - Loïc Djaileb
- Université Grenoble Alpes, INSERM, CHU Grenoble Alpes, LRB, 38000, Grenoble, France
| | - Catherine Ghezzi
- Université Grenoble Alpes, INSERM, CHU Grenoble Alpes, LRB, 38000, Grenoble, France
| | | | - Alexis Broisat
- Université Grenoble Alpes, INSERM, CHU Grenoble Alpes, LRB, 38000, Grenoble, France
| | - Pascale Perret
- Université Grenoble Alpes, INSERM, CHU Grenoble Alpes, LRB, 38000, Grenoble, France
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8
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Duatti A. The DOTA macrocyclic cavity in metallic radiopharmaceuticals: Mythology or reality? EJNMMI Radiopharm Chem 2023; 8:17. [PMID: 37535275 PMCID: PMC10400501 DOI: 10.1186/s41181-023-00202-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 07/31/2023] [Indexed: 08/04/2023] Open
Abstract
BACKGROUND The hypothetical concept of 'macrocyclic cavity' is largely employed as useful model to interpret the affinity of metal ions for the macrocyclic chelating ligand 2,2',2'',2'''-(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrayl)tetraacetic acid (H4DOTA). It Is hypothesized that a close matching between the size of the macrocyclic cavity and that of the metallic ion is a key parameter to ensure the high-yield formation of stable coordination metal-DOTA complex. This approach has become popular in the design of radiopharmaceuticals containing radiometals and H4DOTA as chelating group. RESULTS Based on X-ray structural data of metallic complexes formed by the ligand H4DOTA upon coordination with a variety of metals, an elementary argument based on Euclidean geometry is presented here that questions the existence of the hypothetical 'macrocyclic cavity' within the chelator macrocycle. The geometrical analysis was applied to the complex formed by a Ga3+ ion coordinated to H4DOTA as model compound. CONCLUSIONS Application of Euclidean geometry to calculate bond angles in the coordination complex of the ligand H4DOTA with the Ga+3 ion, supposed to incorporate a hypothetical 'macrocyclic cavity', revealed that this conceptual entity has no physical reality and, therefore, cannot be considered a meaningful description of a stable structural arrangement for metallic radiopharmaceuticals.
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Affiliation(s)
- Adriano Duatti
- Department of Chemical and Pharmaceutical Sciences, University of Ferrara, Via L. Borsari, 46, 44121, Ferrara, Italy.
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Nguyen AT, Kim HK. Recent Developments in PET and SPECT Radiotracers as Radiopharmaceuticals for Hypoxia Tumors. Pharmaceutics 2023; 15:1840. [PMID: 37514026 PMCID: PMC10385036 DOI: 10.3390/pharmaceutics15071840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 06/21/2023] [Accepted: 06/26/2023] [Indexed: 07/30/2023] Open
Abstract
Hypoxia, a deficiency in the levels of oxygen, is a common feature of most solid tumors and induces many characteristics of cancer. Hypoxia is associated with metastases and strong resistance to radio- and chemotherapy, and can decrease the accuracy of cancer prognosis. Non-invasive imaging methods such as positron emission tomography (PET) and single-photon emission computed tomography (SPECT) using hypoxia-targeting radiopharmaceuticals have been used for the detection and therapy of tumor hypoxia. Nitroimidazoles are bioreducible moieties that can be selectively reduced under hypoxic conditions covalently bind to intracellular macromolecules, and are trapped within hypoxic cells and tissues. Recently, there has been a strong motivation to develop PET and SPECT radiotracers as radiopharmaceuticals containing nitroimidazole moieties for the visualization and treatment of hypoxic tumors. In this review, we summarize the development of some novel PET and SPECT radiotracers as radiopharmaceuticals containing nitroimidazoles, as well as their physicochemical properties, in vitro cellular uptake values, in vivo biodistribution, and PET/SPECT imaging results.
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Affiliation(s)
- Anh Thu Nguyen
- Department of Nuclear Medicine, Jeonbuk National University Medical School and Hospital, Jeonju 54907, Republic of Korea
- Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju 54907, Republic of Korea
| | - Hee-Kwon Kim
- Department of Nuclear Medicine, Jeonbuk National University Medical School and Hospital, Jeonju 54907, Republic of Korea
- Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju 54907, Republic of Korea
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10
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Capponi PC, Mari M, Ferrari E, Asti M. Radiolabeled Chalcone Derivatives as Potential Radiotracers for β-Amyloid Plaques Imaging. Molecules 2023; 28:molecules28073233. [PMID: 37049995 PMCID: PMC10096019 DOI: 10.3390/molecules28073233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 03/30/2023] [Accepted: 04/03/2023] [Indexed: 04/09/2023] Open
Abstract
Natural products often provide a pool of pharmacologically relevant precursors for the development of various drug-related molecules. In this review, the research performed on some radiolabeled chalcone derivatives characterized by the presence of the α-β unsaturated carbonyl functional group as potential radiotracers for the imaging of β-amyloids plaques will be summarized. Chalcones’ structural modifications and chemical approaches which allow their radiolabeling with the most common SPECT (Single Photon Emission Computed Tomography) and PET (Positron Emission Tomography) radionuclides will be described, as well as the state of the art regarding their in vitro binding affinity and in vivo biodistribution and pharmacokinetics in preclinical studies. Moreover, an explanation of the rationale behind their potential utilization as probes for Alzheimer’s disease in nuclear medicine applications will be provided.
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Affiliation(s)
- Pier Cesare Capponi
- Radiopharmaceutical Chemistry Section, Nuclear Medicine Unit, AUSL-IRCCS di Reggio Emilia, Viale Risorgimento 80, 42122 Reggio Emilia, Italy
| | - Matteo Mari
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy
| | - Erika Ferrari
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy
| | - Mattia Asti
- Radiopharmaceutical Chemistry Section, Nuclear Medicine Unit, AUSL-IRCCS di Reggio Emilia, Viale Risorgimento 80, 42122 Reggio Emilia, Italy
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