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Tang J, Liu C, Liu C, Hu Q, Fang Y, Chen Z. Evaluation of damage discrimination in dopaminergic neurons using dopamine transporter PET tracer [ 18F]FECNT-d 4. EJNMMI Res 2024; 14:78. [PMID: 39210186 PMCID: PMC11362440 DOI: 10.1186/s13550-024-01140-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2024] [Accepted: 08/16/2024] [Indexed: 09/04/2024] Open
Abstract
BACKGROUND Parkinson's disease (PD) is a prevalent neurodegenerative disorder worldwide, diagnosed based on classic symptoms like motor dysfunction and cognitive impairments. With the development of various radioactive ligands, positron emission tomography (PET) imaging combined with specific radiolabelling probes has proven to be effective in aiding clinical PD diagnosis. Among these probes, 2β-Carbomethoxy-3β-(4-chlorophenyl)-8-(2-[18F]-fluoroethyl) nortropane ([18F]FECNT) has been utilized as a PET tracer to image dopamine transporter (DAT) integrity in striatal presynaptic dopaminergic terminals. However, the presence of brain-penetrant radioactive metabolites produced by [18F]FECNT may impact the accuracy of PET imaging. In previous research, we developed 2β-Carbomethoxy-3β-(4-chlorophenyl)-8-(2-[18F]-fluoroethyl-1,1,2,2-d4) nortropane ([18F]FECNT-d4), a deuterated derivative with enhanced stability in plasma and the striatum, along with a slower washout rate. In this study, we further investigated the potential of [18F]FECNT-d4 to detect dopaminergic neuron degeneration in Parkinson's disease. This involved PET imaging in unilaterally-lesioned PD model rats and in vitro autoradiography conducted on postmortem brain sections. RESULTS PET images revealed reduced specific uptake in the ipsilateral striatum of rats stereotactically injected with 6-hydroxydopamine hydrochloride (6-OHDA). Compared to the sham group, the ratio of standardized uptake value (SUV) in the ipsilateral to contralateral striatum decreased by 13%, 23%, and 63% in the mild, moderate, and severe lesioned groups, respectively. Dopaminergic denervation observed in PET imaging was further supported by behavioral assessments, immunostaining, and monoamine concentration tests. Moreover, the microPET results exhibited positive correlations with these measurements, except for the apomorphine-induced rotational behavior test, which showed a negative correlation. Additionally, [18F]FECNT-d4 uptake was approximately 40% lower in the postmortem striatal sections of a PD patient compared to a healthy subject. Furthermore, estimated human dosimetry (effective dose equivalent: 5.06 E-03 mSv/MBq), extrapolated from rat biodistribution data, remained below the current Food and Drug Administration limit for radiation exposure. CONCLUSION Our findings demonstrate that [18F]FECNT-d4 accurately estimates levels of dopaminergic neuron degeneration in the 6-OHDA-induced PD rat model and effectively distinguishes between PD patients and healthy individuals. This highly sensitive and safe PET probe holds promising potential for clinical application in the diagnosis and monitoring of Parkinson's disease.
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Affiliation(s)
- Jie Tang
- NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, No. 20 Qianrong Road, Binhu District, Wuxi, 214063, China
| | - Congjin Liu
- Department of Nuclear Medicine, Huashan Hospital, Fudan University, No. 12 Wulumuqi Middle Road, Jing'an District, Shanghai, 200040, China
| | - Chunyi Liu
- NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, No. 20 Qianrong Road, Binhu District, Wuxi, 214063, China
| | - Qianyue Hu
- NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, No. 20 Qianrong Road, Binhu District, Wuxi, 214063, China
| | - Yi Fang
- NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, No. 20 Qianrong Road, Binhu District, Wuxi, 214063, China
| | - Zhengping Chen
- NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, No. 20 Qianrong Road, Binhu District, Wuxi, 214063, China.
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Huang AQ, Liu SY, Barret O, Qiao HW, Tamagnan GD, Liu XL, Fan CC, Li Z, Lu J, Chan P, Xu EH. 18F-FP-DTBZ PET/CT detectable associations between monoaminergic depletion in the putamen with rigidity and the pallidus with tremor in Parkinson's disease. Parkinsonism Relat Disord 2024; 120:105979. [PMID: 38241952 DOI: 10.1016/j.parkreldis.2023.105979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 12/23/2023] [Accepted: 12/23/2023] [Indexed: 01/21/2024]
Abstract
INTRODUCTION The motor subtypes of Parkinson's disease (PD) are widely accepted and implemented. However, the motor subtypes have been thought to represent different stages of PD recently because some patients experience tremor-dominant (TD) conversion to the non-tremor-dominant subtype, such as postural instability-gait difficulty (PIGD). In this study, we explore the monoaminergic denervation features of the striatal and extra-striatal areas in patients with different subtypes of PD with 18F-9-fluoropropyl-(+)-dihydrotetrabenazine (18F-FP-DTBZ) PET/CT. METHODS Sixty-five patients diagnosed with PD were included and classified as TD (n = 25) and PIGD (n = 40). We evaluated the difference of monoaminergic features of each subregion of brain between motor subtypes of PD, as well as associations between these features and Parkinsonian motor symptoms. RESULTS The striatal standardized uptake value ratios (SUVR) showed that dopaminergic disruption of patients with PIGD was more symmetrical in the posterior ventral putamen (p < 0.001) and more severe in the ipsilateral posterior dorsal putamen (p < 0.001 corrected) compared with that of patients with TD. The severity of PIGD scores was associated with striatal dopaminergic depletion, while tremor was associated with monoaminergic changes in extra-striatal areas, including pallidus, thalamus, and raphe nuclie. CONCLUSION These results indicate that patients with different motor subtypes may have different underlying mechanisms of PD pathogenesis. Therefore, accurate diagnosis of PD subtypes can aid prognosis evaluation and treatment decision-making.
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Affiliation(s)
- An-Qi Huang
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Shu-Ying Liu
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China; Chinese Institute for Brain Research (CIBR), Beijing, China
| | - Olivier Barret
- University of Paris-Saclay, The French Alternative Energies and Atomic Energy Commission, The French National Center for Scientific Research, Molecular Imaging Research Center, Laboratory of Neurodegenerative Diseases, Fontenay-aux-Roses, France
| | - Hong-Wen Qiao
- Department of Radiology and Nuclear Medicine, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Gilles D Tamagnan
- Mental Health PET Radioligand Development Program, Yale University, New Haven, USA; Xingimaging, 150 Boston Post Road, Madison, LCC, Connecticut, USA
| | - Xiu-Lin Liu
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Cheng-Cheng Fan
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Ze Li
- Department of Radiology and Nuclear Medicine, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Jie Lu
- Department of Radiology and Nuclear Medicine, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Piu Chan
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China; National Clinical Research Center for Geriatric Diseases, Beijing, China.
| | - Er-He Xu
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China.
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Alexoff D, Choi SR, Ploessl K, Kim D, Zhao R, Zhu L, Kung H. Optimization and scale up of production of the PSMA imaging agent [ 18F]AlF-P16-093 on a custom automated radiosynthesis platform. EJNMMI Radiopharm Chem 2024; 9:15. [PMID: 38393404 PMCID: PMC10891009 DOI: 10.1186/s41181-024-00247-1] [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: 01/11/2024] [Accepted: 02/20/2024] [Indexed: 02/25/2024] Open
Abstract
BACKGROUND Recent advancements in positron emission tomograph (PET) using prostate specific membrane antigen (PSMA)-targeted radiopharmaceuticals have changed the standard of care for prostate cancer patients by providing more accurate information during staging of primary and recurrent disease. [68Ga]Ga-P16-093 is a new PSMA-PET radiopharmaceutical that demonstrated superior imaging performance in recent head-to-head studies with [68Ga]Ga-PSMA-11. To improve the availability of this new PSMA PET imaging agent, [18F]AlF-P16-093 was developed. The 18F-analog [18F]AlF-P16-093 has been synthesized manually at low activity levels using [18F]AlF2+ and validated in pre-clinical models. This work reports the optimization of the production of > 15 GBq of [18F]AlF-P16-093 using a custom automated synthesis platform. RESULTS The sensitivity of the radiochemical yield of [18F]AlF-P16-093 to reaction parameters of time, temperature and reagent amounts was investigated using a custom automated system. The automated system is a low-cost, cassette-based system designed for 1-pot syntheses with flow-controlled solid phase extraction (SPE) workup and is based on the Raspberry Pi Zero 2 microcomputer/Python3 ecosystem. The optimized none-decay-corrected yield was 52 ± 4% (N = 3; 17.5 ± 2.2 GBq) with a molar activity of 109 ± 14 GBq/µmole and a radiochemical purity of 98.6 ± 0.6%. Run time was 30 min. A two-step sequence was used: SPE-purified [18F]F- was reacted with 80 nmoles of freeze-dried AlCl3·6H2O at 65 °C for 5 min followed by reaction with 160 nmoles of P16-093 ligand at 40 °C for 4 min in a 1:1 mixture of ethanol:0.5 M pH 4.5 NaOAc buffer. The mixture was purified by SPE (> 97% recovery). The final product formulation (5 mM pH 7 phosphate buffer with saline) exhibited a rate of decline in radiochemical purity of ~ 1.4%/h which was slowed to ~ 0.4%/h when stored at 4 °C. CONCLUSION The optimized method using a custom automated system enabled the efficient (> 50% none-decay-corrected yield) production of [18F]AlF-P16-093 with high radiochemical purity (> 95%). The method and automation system are simple and robust, facilitating further clinical studies with [18F]AlF-P16-093.
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Affiliation(s)
- David Alexoff
- Five Eleven Pharma Inc., Philadelphia, PA, 19104, USA.
| | - Seok Rye Choi
- Five Eleven Pharma Inc., Philadelphia, PA, 19104, USA
| | - Karl Ploessl
- Five Eleven Pharma Inc., Philadelphia, PA, 19104, USA
| | - Dohyun Kim
- Isotope Research and Production Department, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Ruiyue Zhao
- Department of Nuclear Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510120, Guangdong, China
| | - Lin Zhu
- College of Chemistry, Key Laboratory of Radiopharmaceuticals, Ministry of Education, Beijing Normal University, Beijing, 100875, China
| | - Hank Kung
- Department of Radiology, University of Pennsylvania, Philadelphia, PA, 19104, USA
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Ye P, Bi L, Yang M, Qiu Y, Huang G, Liu Y, Hou Y, Li Z, Tong HHY, Cui M, Jin H. Activated Microglia in the Early Stage of a Rat Model of Parkinson's Disease: Revealed by PET-MRI Imaging by [ 18F]DPA-714 Targeting TSPO. ACS Chem Neurosci 2023. [PMID: 37146429 DOI: 10.1021/acschemneuro.3c00080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/07/2023] Open
Abstract
In the past decades, translocator protein (TSPO) has been considered as an in vivo biomarker to measure the presence of neuroinflammatory reactions. In this study, expression of TSPO was quantified via [18F]DPA-714 positron emission tomography-magnetic resonance imaging (PET-MRI) imaging to investigate the effects of microglial activation associated with motor behavioral impairments in the 6-hydroxydopamine (6-OHDA)-treated rodent model of Parkinson's disease (PD). [18F]FDG PET-MRI (for non-specific inflammation), [18F]D6-FP-(+)-DTBZ PET-MRI (for damaged dopaminergic neurons), post-PET immunofluorescence, and Pearson's correlation analyses were also performed. The time course of the striatal [18F]DPA-714 binding ratio elevated in 6-OHDA-treated rats during 1-3 weeks post-treatment, with the peak TSPO binding in the 1st week. No differences between bilateral striatum in [18F]FDG PET imaging were found. Moreover, an obvious correlation between [18F]DPA-714 SUVRR/L and rotation numbers was found (r = 0.434, *p = 0.049). No correlation between [18F]FDG SUVRR/L and rotation behavior was found. [18F]DPA-714 appeared to be a potential PET tracer for imaging the microglia-mediated neuroinflammation in the early stage of PD.
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Affiliation(s)
- Peizhen Ye
- Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, Guangdong 519000, China
| | - Lei Bi
- Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, Guangdong 519000, China
| | - Min Yang
- Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, Guangdong 519000, China
| | - Yifan Qiu
- Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, Guangdong 519000, China
| | - Guolong Huang
- Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, Guangdong 519000, China
| | - Yongshan Liu
- Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, Guangdong 519000, China
| | - Yuyi Hou
- Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, Guangdong 519000, China
| | - Zhijun Li
- Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, Guangdong 519000, China
| | - Henry Hoi Yee Tong
- Faculty of Health Sciences and Sports, Macao Polytechnic University, Macao SAR 999078, China
| | - Mengchao Cui
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Hongjun Jin
- Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, Guangdong 519000, China
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Ye P, Bi L, Yang M, Qiu Y, Huang G, Liu Y, Hou Y, Li Z, Yee Tong HH, Cui M, Jin H. Activated Microglia in the Early Stage of a Rat Model of Parkinson's Disease: Revealed by PET-MRI Imaging by [ 18F]DPA-714 Targeting TSPO. ACS Chem Neurosci 2023. [PMID: 37134001 DOI: 10.1021/acschemneuro.3c00202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023] Open
Abstract
In the past decades, translocator protein (TSPO) has been considered as an in vivo biomarker to measure the presence of neuroinflammatory reactions. In this study, expression of TSPO was quantified via [18F]DPA-714 positron emission tomography-magnetic resonance imaging (PET-MRI) to investigate the effects of microglial activation associated with motor behavioral impairments in the 6-hydroxydopamine (6-OHDA)-treated rodent model of Parkinson's disease (PD). [18F]FDG PET-MRI (for non-specific inflammation), [18F]D6-FP-(+)-DTBZ PET-MRI (for damaged dopaminergic (DA) neurons), post-PET immunofluorescence, and Pearson's correlation analyses were also performed. The time course of striatal [18F]DPA-714 binding ratio was elevated in 6-OHDA-treated rats during 1-3 weeks post-treatments, with peak TSPO binding in the 1st week. No difference between the bilateral striatum in [18F]FDG PET imaging were found. Moreover, an obvious correlation between [18F]DPA-714 SUVRR/L and rotation numbers was found (r = 0.434, *p = 0.049). No correlation between [18F]FDG SUVRR/L and rotation behavior was found. [18F]DPA-714 appeared to be a potential PET tracer for imaging the microglia-mediated neuroinflammation in the early stage of PD.
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Affiliation(s)
- Peizhen Ye
- Guangdong Provincial Engineering Research Center of Molecular Imaging, the Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai City 519000, Guangdong Province, China
| | - Lei Bi
- Guangdong Provincial Engineering Research Center of Molecular Imaging, the Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai City 519000, Guangdong Province, China
| | - Min Yang
- Guangdong Provincial Engineering Research Center of Molecular Imaging, the Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai City 519000, Guangdong Province, China
| | - Yifan Qiu
- Guangdong Provincial Engineering Research Center of Molecular Imaging, the Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai City 519000, Guangdong Province, China
| | - Guolong Huang
- Guangdong Provincial Engineering Research Center of Molecular Imaging, the Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai City 519000, Guangdong Province, China
| | - Yongshan Liu
- Guangdong Provincial Engineering Research Center of Molecular Imaging, the Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai City 519000, Guangdong Province, China
| | - Yuyi Hou
- Guangdong Provincial Engineering Research Center of Molecular Imaging, the Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai City 519000, Guangdong Province, China
| | - Zhijun Li
- Guangdong Provincial Engineering Research Center of Molecular Imaging, the Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai City 519000, Guangdong Province, China
| | - Henry Hoi Yee Tong
- Faculty of Health Sciences and Sports, Macao Polytechnic University, Macao SAR 999078, China
| | - Mengchao Cui
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Hongjun Jin
- Guangdong Provincial Engineering Research Center of Molecular Imaging, the Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai City 519000, Guangdong Province, China
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Dai Y, Sa R, Guan F, Wang Q, Li Y, Zhao H. A Purification Method of 18F-FP-(+)-DTBZ via Solid-Phase Extraction With Combined Cartridges. Front Med (Lausanne) 2021; 8:693632. [PMID: 34307421 PMCID: PMC8298858 DOI: 10.3389/fmed.2021.693632] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Accepted: 06/17/2021] [Indexed: 11/13/2022] Open
Abstract
Background: To optimize [18F] 9-fluoropropyl-(+)-dihydrotetrabenazine (18F-FP-(+)-DTBZ) purification via solid-phase extraction (SPE) with combined cartridges to facilitate its widespread clinical application. Methods: A modified SPE purification method, employing Sep-Pak PS-2 and Sep-Pak C18 cartridges, was used for the preparation of 18F-FP-(+)-DTBZ. This method was compared to the purification method of high-pressure liquid chromatography (HPLC) and SPE with one cartridge, following quality control test and positron emission tomography (PET) imaging in healthy volunteers and patients with parkinsn's disease (PD). Results: A SPE purification method integrating Sep-Pak PS-2 and Sep-Pak C18 cartridges was implemented successfully. The retention time of 18F-FP-(+)-DTBZ purified by HPLC, SPE with Sep-Pak PS-2, SPE with Sep-Pak C18, and SPE with combined use of Sep-Pak PS-2 and Sep-Pak C18 cartridges was 8.7, 8.8, 8.7, and 8.9 min, respectively. Fewest impurity peak was detected in 18F-FP-(+)-DTBZ purified by the SPE with combined use of Sep-Pak PS-2 and Sep-Pak C18 cartridges. This modified SPE purification method provided a satisfactory radiochemical yield of 29 ± 1.8% with radiochemical purity >99% and shortened synthesis time to 27 min. The brain uptake of 18F-FP-(+)-DTBZ purified by the modified SPE was comparable to that purified by HPLC in both healthy volunteers and PD patients. Conclusions: A SPE method integrating Sep-Pak PS-2 and Sep-Pak C18 cartridges for purification of 18F-FP-(+)-DTBZ may be highly suited to automatic synthesis for routine clinical applications, as it provides excellent radiochemical purity, high yield as well as operational simplicity.
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Affiliation(s)
- Yuyin Dai
- Department of Nuclear Medicine, The First Hospital of Jilin University, Changchun, China
| | - Ri Sa
- Department of Nuclear Medicine, The First Hospital of Jilin University, Changchun, China
| | - Feng Guan
- Department of Nuclear Medicine, The First Hospital of Jilin University, Changchun, China
| | - Qi Wang
- Department of Nuclear Medicine, The First Hospital of Jilin University, Changchun, China
| | - Yinghua Li
- Department of Nuclear Medicine, The First Hospital of Jilin University, Changchun, China
| | - Hongguang Zhao
- Department of Nuclear Medicine, The First Hospital of Jilin University, Changchun, China
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Xiao H, Choi SR, Zhao R, Ploessl K, Alexoff D, Zhu L, Zha Z, Kung HF. A New Highly Deuterated [ 18F]AV-45, [ 18F]D15FSP, for Imaging β-Amyloid Plaques in the Brain. ACS Med Chem Lett 2021; 12:1086-1092. [PMID: 34267878 DOI: 10.1021/acsmedchemlett.1c00062] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 06/17/2021] [Indexed: 12/15/2022] Open
Abstract
[18F]AV-45 (florbetapir f18, Amyvid) is an FDA-approved PET imaging agent targeting Aβ plaques in the brain for diagnosis of Alzheimer's disease (AD). Its metabolites led to a high background in the brain and large bone uptake of [18F]F-, produced from dealkylation of the PEG chain. To slow down the in vivo metabolism, we report the design, synthesis, and evaluation of a highly deuterated derivative, [18F]D15FSP, and compared it with N-methyl-deuterated [18F]D3FSP and nondeuterated [18F]AV-45. D15FSP displayed excellent binding affinity (K i = 7.52 nM) to Aβ aggregates. In vitro autoradiography of [18F]D15FSP, [18F]D3FSP, and [18F]AV-45 showed excellent binding to Aβ plaques in human AD brain sections. Biodistribution studies displayed lower bone uptake at 120 min for [18F]D15FSP compared to that for [18F]D3FSP and [18F]AV-45 (1.44 vs 4.23 and 4.03%ID/g, respectively). As the highly deuterated [18F]D15FSP displayed excellent Aβ binding affinity, high initial brain penetration, and lower bone retention, it might be suitable for PET imaging in detecting Aβ plaques.
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Affiliation(s)
- Hao Xiao
- Beijing Institute of Brain Disorders, Laboratory of Brain Disorders, Ministry of Science and Technology, Collaborative Innovation Center for Brain Disorders, Capital Medical University, Beijing 100069, China
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Seok Rye Choi
- Five Eleven Pharma Inc., Philadelphia, Pennsylvania 19104, United States
| | - Ruiyue Zhao
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Karl Ploessl
- Five Eleven Pharma Inc., Philadelphia, Pennsylvania 19104, United States
| | - David Alexoff
- Five Eleven Pharma Inc., Philadelphia, Pennsylvania 19104, United States
| | - Lin Zhu
- Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Zhihao Zha
- Five Eleven Pharma Inc., Philadelphia, Pennsylvania 19104, United States
| | - Hank F. Kung
- Five Eleven Pharma Inc., Philadelphia, Pennsylvania 19104, United States
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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Tang J, Xu Y, Liu C, Fang Y, Cao S, Zhao C, Huang H, Zou M, Chen Z. PET imaging with [ 18F]FP-(+)-DTBZ in 6-OHDA-induced partial and full unilaterally-lesioned model rats of Parkinson's disease and the correlations to the biological data. Nucl Med Biol 2020; 90-91:1-9. [PMID: 32861175 DOI: 10.1016/j.nucmedbio.2020.08.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 06/19/2020] [Accepted: 08/13/2020] [Indexed: 10/23/2022]
Abstract
OBJECTIVE The deficit of dopaminergic neurons in the nigrostriatal pathway is one of the pathological features of Parkinson's disease (PD). The decline of vesicular monoamine transporter type 2 (VMAT2) has been verified to relate with the severity of PD. The purpose of this study was to evaluate the ability of [18F]fluoropropyl-(+)-dihydrotetrabenazine ([18F]FP-(+)-DTBZ) to detect dopaminergic neuron dysfunction in a standard rat model of PD using PET imaging. Specifically, two different doses of 6-hydroxydopamine (6-OHDA) were injected unilaterally into the medial forebrain bundle (MFB) to create the models with two different severities. METHODS Male Sprague-Dawley rats were intracranially injected with 8 μg 6-OHDA (partial lesion group), 16 μg 6-OHDA (full lesion group) and vehicle (sham group) into MFB, respectively. Thirty minutes static [18F]FP-(+)-DTBZ microPET scanning was performed to determine the dopaminergic neuron integrity on the 28th day post-injection and the behavioral tests were carried out in the next two days. Then, the rats were decapitated, and the brains were collected for biogenic amines content analysis or dissected for autoradiography and immunohistochemical (IHC) staining. The correlations of PET results to the behavioral, biological, histological, autoradiography results were analyzed, respectively. RESULTS The standardized uptake value ratio (ST to CB) of [18F]FP-(+)-DTBZ in the ipsilateral striata decreased significantly in partial lesion group and full lesion group. Compared with the sham group, the ratio of the standardized uptake value in ipsilateral striatum to that in contralateral striatum decreased by 57.09 ± 2.30% (full lesion group) and 25.31 ± 5.70% (partial lesion group), respectively. The dopaminergic neuronal dysfunction was corroborated by in vitro autoradiography, IHC, and quantitative analysis of DA as well as its metabolites concentration tests. The motor function impairments of 6-OHDA-treated animals were manifested by a series of behavioral tests. The results of microPET imaging were linearly correlated with behavioral, biological, histological, and autoradiography results, respectively. CONCLUSION Our data suggest that [18F]FP-(+)-DTBZ may be useful for detecting different degrees of dopaminergic neuronal lesions by PET imaging in PD models induced by 6-OHDA.
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Affiliation(s)
- Jie Tang
- NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, China
| | - Yingjiao Xu
- NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, China; Nanjing Medical University, Nanjing 211166, China
| | - Chunyi Liu
- NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, China
| | - Yi Fang
- NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, China
| | | | - Chao Zhao
- NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, China
| | - Hongbo Huang
- NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, China
| | - Meifen Zou
- NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, China
| | - Zhengping Chen
- NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, China.
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