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Bobba KN, Bidkar AP, Meher N, Fong C, Wadhwa A, Dhrona S, Sorlin A, Bidlingmaier S, Shuere B, He J, Wilson DM, Liu B, Seo Y, VanBrocklin HF, Flavell RR. Evaluation of 134Ce/ 134La as a PET Imaging Theranostic Pair for 225Ac α-Radiotherapeutics. J Nucl Med 2023; 64:1076-1082. [PMID: 37201957 PMCID: PMC10315697 DOI: 10.2967/jnumed.122.265355] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 03/07/2023] [Indexed: 05/20/2023] Open
Abstract
225Ac-targeted α-radiotherapy is a promising approach to treating malignancies, including prostate cancer. However, α-emitting isotopes are difficult to image because of low administered activities and a low fraction of suitable γ-emissions. The in vivo generator 134Ce/134La has been proposed as a potential PET imaging surrogate for the therapeutic nuclides 225Ac and 227Th. In this report, we detail efficient radiolabeling methods using the 225Ac-chelators DOTA and MACROPA. These methods were applied to radiolabeling of prostate cancer imaging agents, including PSMA-617 and MACROPA-PEG4-YS5, for evaluation of their in vivo pharmacokinetic characteristics and comparison to the corresponding 225Ac analogs. Methods: Radiolabeling was performed by mixing DOTA/MACROPA chelates with 134Ce/134La in NH4OAc, pH 8.0, at room temperature, and radiochemical yields were monitored by radio-thin-layer chromatography. In vivo biodistributions of 134Ce-DOTA/MACROPA.NH2 complexes were assayed through dynamic small-animal PET/CT imaging and ex vivo biodistribution studies over 1 h in healthy C57BL/6 mice, compared with free 134CeCl3 In vivo, preclinical imaging of 134Ce-PSMA-617 and 134Ce-MACROPA-PEG4-YS5 was performed on 22Rv1 tumor-bearing male nu/nu-mice. Ex vivo biodistribution was performed for 134Ce/225Ac-MACROPA-PEG4-YS5 conjugates. Results: 134Ce-MACROPA.NH2 demonstrated near-quantitative labeling with 1:1 ligand-to-metal ratios at room temperature, whereas a 10:1 ligand-to-metal ratio and elevated temperatures were required for DOTA. Rapid urinary excretion and low liver and bone uptake were seen for 134Ce/225Ac-DOTA/MACROPA. NH2 conjugates in comparison to free 134CeCl3 confirmed high in vivo stability. An interesting observation during the radiolabeling of tumor-targeting vectors PSMA-617 and MACROPA-PEG4-YS5-that the daughter 134La was expelled from the chelate after the decay of parent 134Ce-was confirmed through radio-thin-layer chromatography and reverse-phase high-performance liquid chromatography. Both conjugates, 134Ce-PSMA-617 and 134Ce-MACROPA-PEG4-YS5, displayed tumor uptake in 22Rv1 tumor-bearing mice. The ex vivo biodistribution of 134Ce-MACROPA.NH2, 134Ce-DOTA and 134Ce-MACROPA-PEG4-YS5 corroborated well with the respective 225Ac-conjugates. Conclusion: These results demonstrate the PET imaging potential for 134Ce/134La-labeled small-molecule and antibody agents. The similar 225Ac and 134Ce/134La-chemical and pharmacokinetic characteristics suggest that the 134Ce/134La pair may act as a PET imaging surrogate for 225Ac-based radioligand therapies.
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Affiliation(s)
- Kondapa Naidu Bobba
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California
| | - Anil P Bidkar
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California
| | - Niranjan Meher
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California
| | - Cyril Fong
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California
| | - Anju Wadhwa
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California
| | - Suchi Dhrona
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California
| | - Alex Sorlin
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California
| | - Scott Bidlingmaier
- Department of Anesthesia, University of California, San Francisco, San Francisco, California
| | - Becka Shuere
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California
| | - Jiang He
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, Virginia;
| | - David M Wilson
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California
| | - Bin Liu
- Department of Anesthesia, University of California, San Francisco, San Francisco, California
- UCSF Helen Diller Family Comprehensive Cancer Center, San Francisco, California; and
| | - Youngho Seo
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California
| | - Henry F VanBrocklin
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California;
- UCSF Helen Diller Family Comprehensive Cancer Center, San Francisco, California; and
| | - Robert R Flavell
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California
- UCSF Helen Diller Family Comprehensive Cancer Center, San Francisco, California; and
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, California
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PET in vivo generators 134Ce and 140Nd on an internalizing monoclonal antibody probe. Sci Rep 2022; 12:3863. [PMID: 35264588 PMCID: PMC8907281 DOI: 10.1038/s41598-022-07147-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Accepted: 02/02/2022] [Indexed: 12/02/2022] Open
Abstract
The in vivo-generator radionuclides 140Nd (t1/2 = 3.4 d) and 134Ce (t1/2 = 3.2 d) were used to trace a urokinase-type plasminogen activator (uPA)-targeting mouse monoclonal antibody, ATN-291, in U87 MG xenograft tumor-bearing mice. ATN-291 is known to internalize on the uPA/uPA-receptor pair, making it an appropriate targeting vector for investigating the fate of in vivo generator daughters on internalizing probes. Ante-mortem and post-mortem PET imaging at 120 h post-injection gave no indication of redistribution of the positron emitting daughter nuclides 134La and 140Pr from tumor tissue (p > 0.5). The lack of redistribution indicates that the parent radionuclides 134Ce and 140Nd could be considered as long-lived PET-diagnostic matches to therapeutic radionuclides like 177Lu, 161Tb and 225Ac when internalizing bioconjugates are employed.
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Neuroendocrine Lung Cancer Mouse Models: An Overview. Cancers (Basel) 2020; 13:cancers13010014. [PMID: 33375066 PMCID: PMC7792789 DOI: 10.3390/cancers13010014] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 12/18/2020] [Accepted: 12/19/2020] [Indexed: 11/17/2022] Open
Abstract
Simple Summary Neuroendocrine lung tumors are a heterogeneous group of malignancies that share a common neuroendocrine nature. They range from low- and intermediate-grade typical and atypical carcinoma, to the highly malignant large cell neuroendocrine lung carcinoma and small cell carcinoma, with marked differences in incidences and prognosis. This review delineates the current knowledge of the genetic landscape of the human tumors, its influence in the development of genetically engineered mouse models (GEMMs) and the molecular imaging tools available to detect and monitor these diseases. While small cell lung carcinoma is one of the diseases best represented by GEMMs, there is a worrying lack of animal models for the other members of the group, these being understudied diseases. Regardless of the incidence and material available, they all are in urgent need of effective therapies. Abstract Neuroendocrine lung tumors comprise a range of malignancies that extend from benign tumorlets to the most prevalent and aggressive Small Cell Lung Carcinoma (SCLC). They also include low-grade Typical Carcinoids (TC), intermediate-grade Atypical Carcinoids (AC) and high-grade Large Cell Neuroendocrine Carcinoma (LCNEC). Optimal treatment options have not been adequately established: surgical resection when possible is the choice for AC and TC, and for SCLC chemotherapy and very recently, immune checkpoint inhibitors. Some mouse models have been generated based on the molecular alterations identified in genomic analyses of human tumors. With the exception of SCLC, there is a limited availability of (preclinical) models making their development an unmet need for the understanding of the molecular mechanisms underlying these diseases. For SCLC, these models are crucial for translational research and novel drug testing, given the paucity of human material from surgery. The lack of early detection systems for lung cancer point them out as suitable frameworks for the identification of biomarkers at the initial stages of tumor development and for testing molecular imaging methods based on somatostatin receptors. Here, we review the relevant models reported to date, their impact on the understanding of the biology of the tumor subtypes and their relationships, as well as the effect of the analyses of the genetic landscape of the human tumors and molecular imaging tools in their development.
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Baranyai Z, Tircsó G, Rösch F. The Use of the Macrocyclic Chelator DOTA in Radiochemical Separations. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900706] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Zsolt Baranyai
- Bracco Research Centre Bracco Imaging spa Via Ribes 5 10010 Colleretto Giacosa (TO) Italy
| | - Gyula Tircsó
- Department of Physical Chemistry Faculty of Science and Technology University of Debrecen Egyetem tér 1 Debrecen 4032 Hungary
| | - Frank Rösch
- Institute of Nuclear Chemistry Johannes Gutenberg‐University of Mainz Fritz‐Strassmann‐Weg 2 55128 Mainz Germany
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A solid support generator of the Auger electron emitter rhodium-103m from [ 103Pd]palladium. Appl Radiat Isot 2019; 156:108985. [PMID: 32056685 DOI: 10.1016/j.apradiso.2019.108985] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 11/11/2019] [Accepted: 11/11/2019] [Indexed: 11/22/2022]
Abstract
Auger electron therapy is an attractive modality for targeting microscopic tumors. Rhodium-103 m (103mRh, T½ = 56.1 min) is a promising Auger electron emitter that can be obtained as the decay product of palladium-103 (103Pd, T½ = 16.99 days). 103Pd was chelated in a lipophilic derivative of the 16aneS4 macrocycle and the complex was trapped on a C18 cartridge. Elution with dilute hydrochloric acid gave radiochemically pure 103mRh. We hypothesize this to be through a combination of the Szilard-Chalmers effect and transient ionization.
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Gahete MD, Jimenez-Vacas JM, Alors-Perez E, Herrero-Aguayo V, Fuentes-Fayos AC, Pedraza-Arevalo S, Castaño JP, Luque RM. Mouse models in endocrine tumors. J Endocrinol 2018; 240:JOE-18-0571.R1. [PMID: 30475226 DOI: 10.1530/joe-18-0571] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Accepted: 11/26/2018] [Indexed: 12/14/2022]
Abstract
Endocrine and neuroendocrine tumors comprise a highly heterogeneous group of neoplasms that can arise from (neuro)endocrine cells, either from endocrine glands or from the widespread diffuse neuroendocrine system, and, consequently, are widely distributed throughout the body. Due to their diversity, heterogeneity and limited incidence, studying in detail the molecular and genetic alterations that underlie their development and progression is still a highly elusive task. This, in turn, hinders the discovery of novel therapeutic options for these tumors. To circumvent these limitations, numerous mouse models of endocrine and neuroendocrine tumors have been developed, characterized and used in pre-clinical, co-clinical (implemented in mouse models and patients simultaneously) and post-clinical studies, for they represent powerful and necessary tools in basic and translational tumor biology research. Indeed, different in vivo mouse models, including cell line-based xenografts (CDXs), patient-derived xenografts (PDXs) and genetically engineered mouse models (GEMs), have been used to delineate the development, progression and behavior of human tumors. Results gained with these in vivo models have facilitated the clinical application in patients of diverse breakthrough discoveries made in this field. Herein, we review the generation, characterization and translatability of the most prominent mouse models of endocrine and neuroendocrine tumors reported to date, as well as the most relevant clinical implications obtained for each endocrine and neuroendocrine tumor type.
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Affiliation(s)
- Manuel D Gahete
- M Gahete, Department of Cell Biology, Physiology and Immunology, University of Córdoba, Cordoba, 14011, Spain
| | - Juan M Jimenez-Vacas
- J Jimenez-Vacas, Department of Cell Biology, Physiology and Immunology, University of Córdoba, Cordoba, Spain
| | - Emilia Alors-Perez
- E Alors-Perez, Department of Cell Biology, Physiology and Inmunology, Maimonides Institute for Biomedical Research of Cordoba (IMIBIC) / University of Cordoba, Cordoba, Spain
| | - Vicente Herrero-Aguayo
- V Herrero-Aguayo, Department of Cell Biology, Physiology and Immunology, University of Córdoba, Cordoba, Spain
| | - Antonio C Fuentes-Fayos
- A Fuentes-Fayos, Department of Cell Biology, Physiology and Immunology, University of Córdoba, Cordoba, Spain
| | - Sergio Pedraza-Arevalo
- S Pedraza-Arevalo, Department of Cell Biology, Physiology and Immunology, University of Córdoba, Cordoba, Spain
| | - Justo P Castaño
- J Castaño, Dpt. of Cell Biology-University of Córdoba, IMIBIC-Maimonides Biomedical Research Institute of Cordoba, Cordoba, E-14004, Spain
| | - Raul M Luque
- R Luque, Dept of Cell Biology, Phisiology and Inmunology, Section of Cell Biology, University of Cordoba, Cordoba, Spain, Cordoba, 14014, Spain
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