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Bao K, Yoon JS, Ahn S, Lee JH, Cross CJ, Jeong MY, Frangioni JV, Choi HS. A robotic system for automated chemical synthesis of therapeutic agents. MATERIALS ADVANCES 2024; 5:5290-5297. [PMID: 38894709 PMCID: PMC11181120 DOI: 10.1039/d4ma00099d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Accepted: 04/29/2024] [Indexed: 06/21/2024]
Abstract
The development of novel compounds for tissue-specific targeting and imaging is often impeded by a lack of lead compounds and the availability of reliable chemistry. Automated chemical synthesis systems provide a potential solution by enabling reliable, repeated access to large compound libraries for screening. Here we report an integrated solid-phase combinatorial chemistry system created using commercial and customized robots. Our goal is to optimize reaction parameters, such as varying temperature, shaking, microwave irradiation, aspirating and dispensing large-sized solid beads, and handling different washing solvents for separation and purification. This automated system accommodates diverse chemical reactions such as peptide synthesis and conventional coupling reactions. To confirm its functionality and reproducibility, 20 nerve-specific contrast agents for biomedical imaging were systematically and repeatedly synthesized and compared to other nerve-targeted agents using molecular fingerprinting and Uniform Manifold Approximation and Projection, which lays the foundation for creating reliable and reproductive chemical libraries in bioimaging and nanomedicine.
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Affiliation(s)
- Kai Bao
- Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School Boston MA 02114 USA
- Center for Molecular Imaging, Department of Medicine, Beth Israel Deaconess Medical Center Boston MA 02215 USA
| | - Jong Seo Yoon
- Center for Molecular Imaging, Department of Medicine, Beth Israel Deaconess Medical Center Boston MA 02215 USA
| | - Sung Ahn
- Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School Boston MA 02114 USA
| | - Jeong Heon Lee
- Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School Boston MA 02114 USA
- Center for Molecular Imaging, Department of Medicine, Beth Israel Deaconess Medical Center Boston MA 02215 USA
| | - Conor J Cross
- Center for Molecular Imaging, Department of Medicine, Beth Israel Deaconess Medical Center Boston MA 02215 USA
| | - Myung Yung Jeong
- Center for Molecular Imaging, Department of Medicine, Beth Israel Deaconess Medical Center Boston MA 02215 USA
- Department of Cogno-Mechatronics Engineering, Pusan National University Busan 46241 South Korea
| | - John V Frangioni
- Center for Molecular Imaging, Department of Medicine, Beth Israel Deaconess Medical Center Boston MA 02215 USA
- Curadel, LLC Natick MA 01760 USA
| | - Hak Soo Choi
- Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School Boston MA 02114 USA
- Center for Molecular Imaging, Department of Medicine, Beth Israel Deaconess Medical Center Boston MA 02215 USA
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Sung C, Oh SJ, Kim JS. Imaging Procedure and Clinical Studies of [ 18F]FP-CIT PET. Nucl Med Mol Imaging 2024; 58:185-202. [PMID: 38932763 PMCID: PMC11196481 DOI: 10.1007/s13139-024-00840-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 12/15/2023] [Accepted: 01/05/2024] [Indexed: 06/28/2024] Open
Abstract
N-3-[18F]fluoropropyl-2β-carbomethoxy-3β-4-iodophenyl nortropane ([18F]FP-CIT) is a radiopharmaceutical for dopamine transporter (DAT) imaging using positron emission tomography (PET) to detect dopaminergic neuronal degeneration in patients with parkinsonian syndrome. [18F]FP-CIT was granted approval by the Ministry of Food and Drug Safety in 2008 as the inaugural radiopharmaceutical for PET imaging, and it has found extensive utilization across numerous institutions in Korea. This review article presents an imaging procedure for [18F]FP-CIT PET to aid nuclear medicine physicians in clinical practice and systematically reviews the clinical studies associated with [18F]FP-CIT PET.
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Affiliation(s)
- Changhwan Sung
- Department of Nuclear Medicine, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 05505 Republic of Korea
| | - Seung Jun Oh
- Department of Nuclear Medicine, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 05505 Republic of Korea
| | - Jae Seung Kim
- Department of Nuclear Medicine, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 05505 Republic of Korea
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3
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Kim YI, Lee SH, Jung JH, Kim SY, Ko N, Lee SJ, Oh SJ, Ryu JS, Ko D, Kim W, Kim K. 18F-ASEM PET/MRI targeting alpha7-nicotinic acetylcholine receptor can reveal skeletal muscle denervation. EJNMMI Res 2024; 14:8. [PMID: 38252356 PMCID: PMC10803689 DOI: 10.1186/s13550-024-01067-9] [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: 01/11/2023] [Accepted: 12/31/2023] [Indexed: 01/23/2024] Open
Abstract
BACKGROUND The increased expression of the nicotinic acetylcholine receptor (nAChR) in muscle denervation is thought to be associated with electrophysiological acetylcholine supersensitivity after nerve injury. Hence, we investigated the utility of the 18F-ASEM alpha7-nAChR targeting radiotracer as a new diagnostic method by visualizing skeletal muscle denervation in mouse models of sciatic nerve injury. METHODS Ten-week-old C57BL/6 male mice were utilized. The mice were anesthetized, and the left sciatic nerve was resected after splitting the gluteal muscle. One week (n = 11) and three weeks (n = 6) after the denervation, 18F-ASEM positron emission tomography/magnetic resonance imaging (PET/MRI) was acquired. Maximum standardized uptake values (SUVmax) of the tibialis anterior muscle were measured for the denervated side and the control side. Autoradiographic evaluation was performed to measure the mean counts of the denervated and control tibialis anterior muscles at one week. In addition, immunohistochemistry was used to identify alpha7-nAChR-positive areas in denervated and control tibialis anterior muscles at one week (n = 6). Furthermore, a blocking study was conducted with methyllycaconitine (MLA, n = 5). RESULTS 18F-ASEM PET/MRI showed significantly increased 18F-ASEM uptake in the denervated tibialis anterior muscle relative to the control side one week and three weeks post-denervation. SUVmax of the denervated muscles at one week and three weeks showed significantly higher uptake than the control (P = 0.0033 and 0.0277, respectively). The relative uptake by autoradiography for the denervated muscle was significantly higher than in the control, and immunohistochemistry revealed significantly greater alpha7-nAChR expression in the denervated muscle (P = 0.0277). In addition, the blocking study showed no significant 18F-ASEM uptake in the denervated side when compared to the control (P = 0.0796). CONCLUSIONS Our results suggest that nAChR imaging with 18F-ASEM has potential as a noninvasive diagnostic method for peripheral nervous system disorders.
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Affiliation(s)
- Yong-Il Kim
- Department of Nuclear Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Seung Hak Lee
- Department of Rehabilitation Medicine, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 05505, Republic of Korea.
| | - Jin Hwa Jung
- Convergence Medicine Research Center, Asan Institute for Life Sciences, Asan Medical Center, Seoul, Republic of Korea
- Asan Institute for Life Sciences, Asan Medical Center, Seoul, Republic of Korea
| | - Seog-Young Kim
- Convergence Medicine Research Center, Asan Institute for Life Sciences, Asan Medical Center, Seoul, Republic of Korea
- Asan Institute for Life Sciences, Asan Medical Center, Seoul, Republic of Korea
| | - Nare Ko
- Department of Nuclear Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
- Asan Institute for Life Sciences, Asan Medical Center, Seoul, Republic of Korea
| | - Sang Ju Lee
- Department of Nuclear Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Seung Jun Oh
- Department of Nuclear Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Jin-Sook Ryu
- Department of Nuclear Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Dabin Ko
- Department of Rehabilitation Medicine, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 05505, Republic of Korea
| | - Won Kim
- Department of Rehabilitation Medicine, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 05505, Republic of Korea
| | - Kyunggon Kim
- Convergence Medicine Research Center, Asan Institute for Life Sciences, Asan Medical Center, Seoul, Republic of Korea
- Asan Institute for Life Sciences, Asan Medical Center, Seoul, Republic of Korea
- Department of Biomedical Sciences, University of Ulsan College of Medicine, Seoul, Republic of Korea
- Clinical Proteomics Core Laboratory, Convergence Medicine Research Center, Asan Medical Center, Seoul, Republic of Korea
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Haveman LYF, Vugts DJ, Windhorst AD. State of the art procedures towards reactive [ 18F]fluoride in PET tracer synthesis. EJNMMI Radiopharm Chem 2023; 8:28. [PMID: 37824021 PMCID: PMC10570257 DOI: 10.1186/s41181-023-00203-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 08/03/2023] [Indexed: 10/13/2023] Open
Abstract
BACKGROUND Positron emission tomography (PET) is a powerful, non-invasive preclinical and clinical nuclear imaging technique used in disease diagnosis and therapy assessment. Fluorine-18 is the predominant radionuclide used for PET tracer synthesis. An impressive variety of new 'late-stage' radiolabeling methodologies for the preparation of 18F-labeled tracers has appeared in order to improve the efficiency of the labeling reaction. MAIN BODY Despite these developments, one outstanding challenge into the early key steps of the process remains: the preparation of reactive [18F]fluoride from oxygen-18 enriched water ([18O]H2O). In the last decade, significant changes into the trapping, elution and drying stages have been introduced. This review provides an overview of the strategies and recent developments in the production of reactive [18F]fluoride and its use for radiolabeling. CONCLUSION Improved, modified or even completely new fluorine-18 work-up procedures have been developed in the last decade with widespread use in base-sensitive nucleophilic 18F-fluorination reactions. The many promising developments may lead to a few standardized drying methodologies for the routine production of a broad scale of PET tracers.
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Affiliation(s)
- Lizeth Y F Haveman
- Radiology and Nuclear Medicine, Amsterdam UMC, Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands
- Chemistry and Pharmaceutical Sciences, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Amsterdam, The Netherlands
| | - Danielle J Vugts
- Radiology and Nuclear Medicine, Amsterdam UMC, Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands
- Cancer Center Amsterdam (CCA), Amsterdam, The Netherlands
| | - Albert D Windhorst
- Radiology and Nuclear Medicine, Amsterdam UMC, Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands.
- Neuroscience Amsterdam, Amsterdam, The Netherlands.
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Bratteby K, Shalgunov V, Herth MM. Aliphatic 18 F-Radiofluorination: Recent Advances in the Labeling of Base-Sensitive Substrates*. ChemMedChem 2021; 16:2612-2622. [PMID: 34169672 DOI: 10.1002/cmdc.202100303] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Indexed: 12/19/2022]
Abstract
Aliphatic fluorine-18 radiolabeling is the most commonly used method to synthesize tracers for PET-imaging. With an increasing demand for 18 F-radiotracers for clinical applications, new labeling strategies aiming to increase radiochemical yields of established tracers or, more importantly, to enable 18 F-labeling of new scaffolds have been developed. In recent years, increased attention has been focused on the direct aliphatic 18 F-fluorination of base-sensitive substrates in this respect. This minireview gives a concise overview of the recent advances within this field and aims to highlight the advantages and limitations of these methods.
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Affiliation(s)
- Klas Bratteby
- Department of Drug Design and Pharmacology Faculty of Health and Medical Sciences, University of Copenhagen, Jagtvej 160, 2100, Copenhagen, Denmark.,Department of Radiation Physics, Skåne University Hospital, Barngatan 3, 222 42, Lund, Sweden.,Department of Clinical Physiology, Nuclear Medicine & PET Rigshospitalet, Blegdamsvej 9, 2100, Copenhagen, Denmark
| | - Vladimir Shalgunov
- Department of Drug Design and Pharmacology Faculty of Health and Medical Sciences, University of Copenhagen, Jagtvej 160, 2100, Copenhagen, Denmark
| | - Matthias Manfred Herth
- Department of Drug Design and Pharmacology Faculty of Health and Medical Sciences, University of Copenhagen, Jagtvej 160, 2100, Copenhagen, Denmark.,Department of Clinical Physiology, Nuclear Medicine & PET Rigshospitalet, Blegdamsvej 9, 2100, Copenhagen, Denmark
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Goggi JL, Qiu L, Liao MC, Khanapur S, Jiang L, Boominathan R, Hartimath SV, Cheng P, Yong FF, Soh V, Deng X, Lin YM, Haslop A, Tan PW, Zeng X, Lee JWL, Zhang Z, Sadasivam P, Tan EK, Luthra SK, Shingleton WD, Oh SKW, Zeng L, Robins EG. Dopamine transporter neuroimaging accurately assesses the maturation of dopamine neurons in a preclinical model of Parkinson's disease. Stem Cell Res Ther 2020; 11:347. [PMID: 32771055 PMCID: PMC7414543 DOI: 10.1186/s13287-020-01868-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 06/30/2020] [Accepted: 07/31/2020] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Significant developments in stem cell therapy for Parkinson's disease (PD) have already been achieved; however, methods for reliable assessment of dopamine neuron maturation in vivo are lacking. Establishing the efficacy of new cellular therapies using non-invasive methodologies will be critical for future regulatory approval and application. The current study examines the utility of neuroimaging to characterise the in vivo maturation, innervation and functional dopamine release of transplanted human embryonic stem cell-derived midbrain dopaminergic neurons (hESC-mDAs) in a preclinical model of PD. METHODS Female NIH RNu rats received a unilateral stereotaxic injection of 6-OHDA into the left medial forebrain bundle to create the PD lesion. hESC-mDA cell and sham transplantations were carried out 1 month post-lesion, with treated animals receiving approximately 4 × 105 cells per transplantation. Behavioural analysis, [18F]FBCTT and [18F]fallypride microPET/CT, was conducted at 1, 3 and 6 months post-transplantation and compared with histological characterisation at 6 months. RESULTS PET imaging revealed transplant survival and maturation into functional dopaminergic neurons. [18F]FBCTT-PET/CT dopamine transporter (DAT) imaging demonstrated pre-synaptic restoration and [18F]fallypride-PET/CT indicated functional dopamine release, whilst amphetamine-induced rotation showed significant behavioural recovery. Moreover, histology revealed that the grafted cells matured differently in vivo producing high- and low-tyrosine hydroxylase (TH) expressing cohorts, and only [18F]FBCTT uptake was well correlated with differentiation. CONCLUSIONS This study provides further evidence for the value of in vivo functional imaging for the assessment of cell therapies and highlights the utility of DAT imaging for the determination of early post-transplant cell maturation and differentiation of hESC-mDAs.
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Affiliation(s)
- Julian L Goggi
- Singapore Bioimaging Consortium, A*STAR, 11 Biopolis Way, #01-02 HELIOS, Singapore, 138667, Singapore
| | - Lifeng Qiu
- Neural Stem Cell Research Lab, Research Department, National Neuroscience Institute, 11 Jalan Tan Tock Seng, Singapore, 308433, Singapore
| | - Mei Chih Liao
- Bioprocessing Technology Institute, A*STAR, 20 Biopolis Way, #06-01 Centros, Singapore, 138668, Singapore
| | - Shivashankar Khanapur
- Singapore Bioimaging Consortium, A*STAR, 11 Biopolis Way, #01-02 HELIOS, Singapore, 138667, Singapore
| | - Lingfan Jiang
- Singapore Bioimaging Consortium, A*STAR, 11 Biopolis Way, #01-02 HELIOS, Singapore, 138667, Singapore
| | - Ramasamy Boominathan
- Singapore Bioimaging Consortium, A*STAR, 11 Biopolis Way, #01-02 HELIOS, Singapore, 138667, Singapore
| | - Siddesh V Hartimath
- Singapore Bioimaging Consortium, A*STAR, 11 Biopolis Way, #01-02 HELIOS, Singapore, 138667, Singapore
| | - Peter Cheng
- Singapore Bioimaging Consortium, A*STAR, 11 Biopolis Way, #01-02 HELIOS, Singapore, 138667, Singapore
| | - Fui Fong Yong
- Singapore Bioimaging Consortium, A*STAR, 11 Biopolis Way, #01-02 HELIOS, Singapore, 138667, Singapore
| | - Vanessa Soh
- Singapore Bioimaging Consortium, A*STAR, 11 Biopolis Way, #01-02 HELIOS, Singapore, 138667, Singapore
| | - Xiaozhou Deng
- Singapore Bioimaging Consortium, A*STAR, 11 Biopolis Way, #01-02 HELIOS, Singapore, 138667, Singapore
| | - Youshan Melissa Lin
- Bioprocessing Technology Institute, A*STAR, 20 Biopolis Way, #06-01 Centros, Singapore, 138668, Singapore
| | - Anna Haslop
- Singapore Bioimaging Consortium, A*STAR, 11 Biopolis Way, #01-02 HELIOS, Singapore, 138667, Singapore
| | - Peng Wen Tan
- Singapore Bioimaging Consortium, A*STAR, 11 Biopolis Way, #01-02 HELIOS, Singapore, 138667, Singapore
| | - Xiaoxia Zeng
- Neural Stem Cell Research Lab, Research Department, National Neuroscience Institute, 11 Jalan Tan Tock Seng, Singapore, 308433, Singapore
| | - Jolene W L Lee
- Neural Stem Cell Research Lab, Research Department, National Neuroscience Institute, 11 Jalan Tan Tock Seng, Singapore, 308433, Singapore
| | - Zhiwei Zhang
- Neural Stem Cell Research Lab, Research Department, National Neuroscience Institute, 11 Jalan Tan Tock Seng, Singapore, 308433, Singapore
| | - Pragalath Sadasivam
- Singapore Bioimaging Consortium, A*STAR, 11 Biopolis Way, #01-02 HELIOS, Singapore, 138667, Singapore
| | - Eng King Tan
- Research Department, National Neuroscience Institute, SGH Campus, Singapore, 169856, Singapore.,Department of Neurology, National Neuroscience Institute, SGH Campus, Singapore, 169856, Singapore.,Neuroscience & Behavioural Disorders Program, DUKE-NUS Graduate Medical School, Singapore, 169857, Singapore
| | - Sajinder K Luthra
- GE Healthcare Life Sciences, White Lion Rd., Little Chalfont, Amersham, HP7 9LL, UK
| | - William D Shingleton
- GE Healthcare Life Sciences, White Lion Rd., Little Chalfont, Amersham, HP7 9LL, UK
| | - Steve K W Oh
- Bioprocessing Technology Institute, A*STAR, 20 Biopolis Way, #06-01 Centros, Singapore, 138668, Singapore
| | - Li Zeng
- Neural Stem Cell Research Lab, Research Department, National Neuroscience Institute, 11 Jalan Tan Tock Seng, Singapore, 308433, Singapore. .,Neuroscience & Behavioural Disorders Program, DUKE-NUS Graduate Medical School, Singapore, 169857, Singapore. .,Lee Kong Chian School of Medicine, Novena Campus, 11 Mandalay Road, Singapore, 308232, Singapore.
| | - Edward G Robins
- Singapore Bioimaging Consortium, A*STAR, 11 Biopolis Way, #01-02 HELIOS, Singapore, 138667, Singapore. .,Clinical Imaging Research Centre, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 117599, Singapore.
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Ermert J, Benešová M, Hugenberg V, Gupta V, Spahn I, Pietzsch HJ, Liolios C, Kopka K. Radiopharmaceutical Sciences. Clin Nucl Med 2020. [DOI: 10.1007/978-3-030-39457-8_2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Arlicot N, Vercouillie J, Malherbe C, Bidault R, Gissot V, Maia S, Barantin L, Cottier JP, Deloye JB, Guilloteau D, Ribeiro MJ. PET imaging of Dopamine Transporter with [18F]LBT-999: initial evaluation in healthy volunteers. THE QUARTERLY JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING : OFFICIAL PUBLICATION OF THE ITALIAN ASSOCIATION OF NUCLEAR MEDICINE (AIMN) [AND] THE INTERNATIONAL ASSOCIATION OF RADIOPHARMACOLOGY (IAR), [AND] SECTION OF THE SOCIETY OF... 2019; 66:148-155. [PMID: 31496203 DOI: 10.23736/s1824-4785.19.03175-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND To evaluate in healthy human brain the distribution, uptake, and kinetics of [18F]LBT-999, a PET ligand targeting the dopamine transporter, to assess its ability to explore dopaminergic innervation, using a shorter protocol, more convenient for patients than currently with [123I]ioflupane. METHODS After intravenous injection of [18F]LBT-999, 8 healthy subjects (53-80y) underwent a dynamic PET-scan. Venous samples were concomitantly obtained for metabolites analysis. Time activity curves (TACs) were generated for several ROIs (caudate, putamen, occipital cortex, substantia nigra and cerebellum). Cerebellum was used as reference region to calculate binding potentials (BPND). RESULTS No adverse events or detectable pharmacological effects were reported. [18F]LBT-999 PET revealed a good cerebral distribution, with an intense and symmetric uptake in both putamen and caudate (BPND of 6.75±1.17 and 6.30±1.17, respectively), without other brain abnormal tracer accumulation. Regional TACs showed a plateau from the maximal uptake, 20min pi, to the end of the acquisition for both caudate and putamen, whereas uptake in substantia nigra decreased progressively. A faster clearance and lowest BPND values were observed in both cortex and cerebellum. Ratios to the cerebellum exhibit value of about 3 in substantia nigra, close to 10 for both caudate and putamen, and remained around the value of 1 in cortex. The parent fraction of [18F]LBT-999 in plasma was 80%, 60% and 45% at 15, 30 and 45 min pi, respectively. CONCLUSIONS These findings support the usefulness of [18F]LBT-999 for a quantitative clinical evaluation of presynaptic dopaminergic innervation.
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Affiliation(s)
- Nicolas Arlicot
- CHRU de Tours, Unité de Radiopharmacie, Tours, France - .,UMR 1253, iBrain, Université de Tours, Inserm, Tours, France - .,-INSERM CIC 1415, University Hospital, Tours, France -
| | - Johnny Vercouillie
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France.,-INSERM CIC 1415, University Hospital, Tours, France
| | - Cécile Malherbe
- CHRU de Tours, Unité de Radiopharmacie, Tours, France.,UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | - Rudy Bidault
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | | | - Serge Maia
- CHRU de Tours, Unité de Radiopharmacie, Tours, France.,UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | | | - Jean-Philippe Cottier
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France.,CHRU de Tours, Service de Neuroradiologie, Tours, France
| | | | - Denis Guilloteau
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France.,-INSERM CIC 1415, University Hospital, Tours, France.,CHRU de Tours, Service de Médecine Nucléaire in vitro, Tours, France
| | - Maria-Joao Ribeiro
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France.,-INSERM CIC 1415, University Hospital, Tours, France.,CHRU de Tours, Service de Médecine Nucléaire in vivo, Tours, France
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Lee JW, Oliveira MT, Jang HB, Lee S, Chi DY, Kim DW, Song CE. Hydrogen-bond promoted nucleophilic fluorination: concept, mechanism and applications in positron emission tomography. Chem Soc Rev 2018; 45:4638-50. [PMID: 27264160 DOI: 10.1039/c6cs00286b] [Citation(s) in RCA: 100] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Due to the tremendous interest in carbon-fluorine bond-forming reactions, research efforts in this area have been dedicated to the development of facile processes to synthesize small fluorine-containing organic molecules. Among others, PET (Positron Emission Tomography) is one of the most important applications of fluorine chemistry. Recognizing the specific requirements of PET processes, some groups have focused on fluorination reactions using alkali metal fluorides, particularly through SN2-type reactions. However, a common "misconception" about the role of protic solvents and hydrogen bonding interactions in this class of reactions has hampered the employment of these excellent promoters. Herein, we would like to review recent discoveries in this context, showing straightforward nucleophilic fluorination reactions using alkali metal fluorides promoted by protic solvents. Simultaneous dual activation of reacting partners by intermolecular hydrogen bonding and the enhancement of the "effective fluoride nucleophilicity", which is Nature's biocatalytic approach with the fluorinase enzyme, are the key to this unprecedentedly successful nucleophilic fluorination.
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Affiliation(s)
- Ji-Woong Lee
- Department of Chemistry, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 440-746, Korea.
| | - Maria Teresa Oliveira
- Department of Chemistry, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 440-746, Korea.
| | - Hyeong Bin Jang
- Department of Chemistry, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 440-746, Korea.
| | - Sungyul Lee
- Department of Applied Chemistry, Kyung Hee University 1732, Duckyoung-daero 1732, Gihung-gu, Yongin-si, Gyeonggi-do 446-701, Korea.
| | - Dae Yoon Chi
- Department of Chemistry, Sogang University, 35 Baekbeomro Mapogu, Seoul 121-742, Korea.
| | - Dong Wook Kim
- Department of Chemistry, Inha University, 100 Inha-ro, Nam-gu, Incheon 402-751, Korea.
| | - Choong Eui Song
- Department of Chemistry, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 440-746, Korea.
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Lee SJ, Oh SJ, Cho EH, Kim DH, Furumoto S, Okamura N, Kim JS. Full automatic synthesis of [18F]THK-5351 for tau protein PET imaging in Alzheimer’s disease patients: 1 year experience. J Radioanal Nucl Chem 2017. [DOI: 10.1007/s10967-017-5573-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Riss PJ, Stockhofe K, Roesch F. Tropane-derived (11) C-labelled and (18) F-labelled DAT ligands. J Labelled Comp Radiopharm 2014; 56:149-58. [PMID: 24285320 DOI: 10.1002/jlcr.3018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 11/30/2012] [Accepted: 12/04/2012] [Indexed: 01/02/2023]
Abstract
Radiolabelling of cocaine-derived 3-phenyltropanes for dopamine transporter positron emission tomography with (18) F and (11) C is reviewed.
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Affiliation(s)
- P J Riss
- Wolfson Brain Imaging Centre, University of Cambridge, Box 65 Addenbrooke's Hospital, CB2 0QQ, Cambridge, UK
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Lee SJ, Hyun JS, Oh SJ, Yu KH, Ryu JS. Development of a new precursor-minimizing base control method and its application for the automated synthesis and SPE purification of [18F]fluoromisonidazole ([18F]FMISO). J Labelled Comp Radiopharm 2013; 56:731-5. [DOI: 10.1002/jlcr.3115] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Revised: 07/22/2013] [Accepted: 08/18/2013] [Indexed: 11/09/2022]
Affiliation(s)
- Sang Ju Lee
- Department of Nuclear Medicine, Asan Medical Center; University of Ulsan College of Medicine; 388-1 Pungnap-dong, Songpa-gu Seoul 138-736 Korea
| | - Ji Suk Hyun
- Department of Nuclear Medicine, Asan Medical Center; University of Ulsan College of Medicine; 388-1 Pungnap-dong, Songpa-gu Seoul 138-736 Korea
- Department of Chemistry; Dong Guk University; Seoul Korea
| | - Seung Jun Oh
- Department of Nuclear Medicine, Asan Medical Center; University of Ulsan College of Medicine; 388-1 Pungnap-dong, Songpa-gu Seoul 138-736 Korea
| | - Kook Hyun Yu
- Department of Chemistry; Dong Guk University; Seoul Korea
| | - Jin Sook Ryu
- Department of Nuclear Medicine, Asan Medical Center; University of Ulsan College of Medicine; 388-1 Pungnap-dong, Songpa-gu Seoul 138-736 Korea
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Riss PJ, Hoehnemann S, Piel M, Roesch F. Two-step radiosynthesis of [18F]FE-β-CIT and [18F]PR04.MZ. J Labelled Comp Radiopharm 2013; 56:356-9. [DOI: 10.1002/jlcr.3032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2012] [Revised: 11/29/2012] [Accepted: 01/14/2013] [Indexed: 02/06/2023]
Affiliation(s)
| | - Sabine Hoehnemann
- Institut für Kernchemie; Universität Mainz; Fritz Strassmann Weg 2; 55128; Mainz; Germany
| | - Markus Piel
- Institut für Kernchemie; Universität Mainz; Fritz Strassmann Weg 2; 55128; Mainz; Germany
| | - Frank Roesch
- Institut für Kernchemie; Universität Mainz; Fritz Strassmann Weg 2; 55128; Mainz; Germany
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14
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Feasibility of PET Template-Based Analysis on F-18 FP-CIT PET in Patients with De Novo Parkinson's Disease. Nucl Med Mol Imaging 2013; 47:73-80. [PMID: 24900086 DOI: 10.1007/s13139-013-0196-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 02/12/2013] [Accepted: 02/28/2013] [Indexed: 10/27/2022] Open
Abstract
PURPOSE The aim of this study was to evaluate the feasibility of FP-CIT PET template-based quantitative analysis on F-18 FP-CIT PET in patients with de novo Parkinson's disease (PD), compared with MR-based and manual methods. We also assessed the correlation of quantitative parameters of those methods with clinical severity of the disease. METHODS Forty patients with de novo PD underwent both MRI and F-18 FP-CIT PET. Images were spatially normalized to a standardized PET template. Mean counts of 4 ROIs: putamen, caudate, occipital cortex and cerebellum, were obtained using the quantification program, Korean Statistical Probabilistic Anatomical Map (KSPAM). Putamen-to-caudate ratio (PCR), asymmetry index (ASI), specific-to-nonspecific ratios with two different references: to occipital cortex (SOR) and cerebellum (SCR) were compared. Parameters were also calculated from manually drawn ROI method and MR-coregistrated method. RESULTS All quantitative parameters showed significant correlations across the three different methods, especially between the PET-based and manual methods. Among them, PET-based SOR and SCR values showed an excellent correlation and concordance with those of manual method. In relationship with clinical severity, only ASI achieved significantly inverse correlations with H&Y stage and UPDRS motor score. There was no significant difference between the quantitative parameters of both occipital cortex and cerebellum in all three methods, which implied that quantitation using PET-based method could be reproducible regardless of the reference region. CONCLUSIONS Quantitative parameters using FP-CIT PET template-based method correlated well with those using laborious manual method with excellent concordance. Moreover, PET-based quantitation was less influenced by the reference region than MR-based method. It suggests that PET-based method can provide objective and quantitative parameters quickly and easily as a feasible analysis in place of conventional method.
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15
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Bejot R, Goggi J, Moonshi SS, Robins EG. A practical synthesis of [(18) F]FtRGD: an angiogenesis biomarker for PET. J Labelled Comp Radiopharm 2013; 56:42-9. [PMID: 24285281 DOI: 10.1002/jlcr.3019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Revised: 10/05/2012] [Accepted: 12/06/2012] [Indexed: 11/08/2022]
Abstract
Integrins have become increasingly attractive targets for molecular imaging of angiogenesis with positron emission tomography or single-photon emission computed tomography, but the reliable production of radiopharmaceuticals remains challenging. A strategy for chemoselective labeling of the integrin ligand-c(RGDyK) peptide-has been developed on the basis of the Cu(I)-catalyzed conjugation reaction. Recently, we reported a nucleophilic detagging and fluorous solid-phase extraction method providing an easy way to implement an approach for obtaining 2-[(18) F]fluoroethyl azide. In this work, we report the practical use of this method for the preparation of the 2-[(18) F]fluoroethyl-triazolyl conjugated c(RGDyK) peptide: [(18) F]FtRGD. The two-step, two-pot synthesis, HPLC purification, and reformulation could be readily performed with a standard nucleophilic radiofluorination synthesizer (GE TRACERlab FXFN ), with minimal modifications. [(18) F]FtRGD was obtained in a solution for injection (>500 MBq/mL) in 10-30% nondecay-corrected radiochemical yield, excellent radiochemical purity (>98%), and 28 ± 13 GBq/µmol specific activity. [(18) F]FtRGD (Ki = 54 ± 14 nM for αV β3 and 1.7 ± 0.2 nM for αV β5 ) was evaluated in mice and showed good stability in vivo, good tumor-to-background ratio (1.6 ± 0.3 %ID/g at 1.5 h post-injection in U87-MG tumors), and rapid urinary excretion. Therefore, [(18) F]FtRGD proved valuable for preclinical positron emission tomography imaging of integrin expression.
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Affiliation(s)
- Romain Bejot
- Singapore Bioimaging Consortium (A*STAR), Helios, 02-02, 11 Biopolis Way, Singapore, 138667, Singapore
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Lee SJ, Oh SJ, Chi DY, Moon DH, Ryu JS. High Yielding [18F]Fluorination Method by Fine Control of the Base. B KOREAN CHEM SOC 2012. [DOI: 10.5012/bkcs.2012.33.7.2177] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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17
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Svadberg A, Wickstrøm T, Hjelstuen OK. Degradation of acetonitrile in eluent solutions for [18F]fluoride PET chemistry: impact on radiosynthesis of [18F]FACBC and [18F]FDG. J Labelled Comp Radiopharm 2012. [DOI: 10.1002/jlcr.1956] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Anders Svadberg
- Department of Pharmaceutics and Biopharmaceutics, Institute of Pharmacy; University of Tromsø; Tromsø N-9037; Norway
| | - Torild Wickstrøm
- Medical Diagnostics R&D; GE Healthcare; PO Box 4220; Oslo N-0401; Norway
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