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Vanda D, Zajdel P, Soural M. Imidazopyridine-based selective and multifunctional ligands of biological targets associated with psychiatric and neurodegenerative diseases. Eur J Med Chem 2019; 181:111569. [DOI: 10.1016/j.ejmech.2019.111569] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 06/26/2019] [Accepted: 07/28/2019] [Indexed: 12/18/2022]
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MacAskill MG, Walton T, Williams L, Morgan TEF, Alcaide-Corral CJ, Dweck MR, Gray GA, Newby DE, Lucatelli C, Sutherland A, Pimlott SL, Tavares AAS. Kinetic modelling and quantification bias in small animal PET studies with [18F]AB5186, a novel 18 kDa translocator protein radiotracer. PLoS One 2019; 14:e0217515. [PMID: 31150436 DOI: 10.1371/journal.pone.0217515] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 05/13/2019] [Indexed: 11/19/2022] Open
Abstract
Introduction Positron Emission Tomography (PET) imaging with selective 18 kDa translocator protein (TSPO) radiotracers has contributed to our understanding on the role of inflammation in disease development and progression. With an increasing number of rodent models of human disease and expansion of the preclinical PET imaging base worldwide, accurate quantification of longitudinal rodent TSPO PET datasets is necessary. This is particularly relevant as TSPO PET quantification relies on invasive blood sampling due to lack of a suitable tissue reference region. Here we investigate the kinetics and quantification bias of a novel TSPO radiotracer [18F]AB5186 in rats using automatic, manual and image derived input functions. Methods [18F]AB5186 was administered intravenously and dynamic PET imaging was acquired over 2 hours. Arterial blood was collected manually to derive a population based input function or using an automatic blood sampler to derive a plasma input function. Manually sampled blood was also used to analyze the [18F]AB5186 radiometabolite profile in plasma and applied to all groups as a population based dataset. Kinetic models were used to estimate distribution volumes (VT) and [18F]AB5186 outcome measure bias was determined. Results [18F]AB5186 distribution in rats was consistent with TSPO expression and at 2 h post-injection 50% of parent compound was still present in plasma. Population based manual sampling methods and image derived input function (IDIF) underestimated VT by ~50% and 88% compared with automatic blood sampling, respectively. The VT variability was lower when using IDIF versus arterial blood sampling methods and analysis of the Bland-Altman plots showed a good agreement between methods of analysis. Conclusion Quantification of TSPO PET rodent data using image-derived methods, which are more amenable for longitudinal scanning of small animals, yields outcome measures with reduced variability and good agreement, albeit biased, compared with invasive blood sampling methods.
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Savisto N, Bergman J, Aromaa J, Forsback S, Eskola O, Viljanen T, Rajander J, Johansson S, Grigg J, Luthra S, Solin O. Influence of transport line material on the molar activity of cyclotron produced [18F]fluoride. Nucl Med Biol 2018; 64-65:8-15. [DOI: 10.1016/j.nucmedbio.2018.06.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 05/28/2018] [Accepted: 06/16/2018] [Indexed: 10/28/2022]
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Kuszpit K, Hollidge BS, Zeng X, Stafford RG, Daye S, Zhang X, Basuli F, Golden JW, Swenson RE, Smith DR, Bocan TM. [ 18F]DPA-714 PET Imaging Reveals Global Neuroinflammation in Zika Virus-Infected Mice. Mol Imaging Biol 2018; 20:275-283. [PMID: 28900831 PMCID: PMC5862915 DOI: 10.1007/s11307-017-1118-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
PURPOSE The association of Zika virus (ZIKV) infection and development of neurological sequelae require a better understanding of the pathogenic mechanisms causing severe disease. The purpose of this study was to evaluate the ability and sensitivity of positron emission tomography (PET) imaging using [18F]DPA-714, a translocator protein (TSPO) 18 kDa radioligand, to detect and quantify neuroinflammation in ZIKV-infected mice. PROCEDURES We assessed ZIKV-induced pathogenesis in wild-type C57BL/6 mice administered an antibody to inhibit type I interferon (IFN) signaling. [18F]DPA-714 PET imaging was performed on days 3, 6, and 10 post-infection (PI), and tissues were subsequently processed for histological evaluation, quantification of microgliosis, and detection of viral RNA by in situ hybridization (ISH). RESULTS In susceptible ZIKV-infected mice, viral titers in the brain increased from days 3 to 10 PI. Over this span, these mice showed a two- to sixfold increase in global brain neuroinflammation using [18F]DPA-714 PET imaging despite limited, regional detection of viral RNA. No measurable increase in ionized calcium binding adaptor molecule 1 (Iba-1) expression was noted at day 3 PI; however, there was a modest increase at day 6 PI and an approximately significant fourfold increase in Iba-1 expression at day 10 PI in the susceptible ZIKV-infected group relative to controls. CONCLUSIONS The results of the current study demonstrate that global neuroinflammation plays a significant role in the progression of ZIKV infection and that [18F]DPA-714 PET imaging is a sensitive tool relative to histology for the detection of neuroinflammation. [18F]DPA-714 PET imaging may be useful in dynamically characterizing the pathology associated with neurotropic viruses and the evaluation of therapeutics being developed for treatment of infectious diseases.
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Affiliation(s)
- Kyle Kuszpit
- Molecular and Translational Sciences Division, U.S. Army Medical Research Institute of Infectious Diseases, 1425, Porter St., Ft. Detrick, Frederick, MD, 21702, USA
| | - Bradley S Hollidge
- Virology Division, U.S. Army Medical Research Institute of Infectious Diseases, 1425, Porter St., Ft. Detrick, Frederick, MD, 21702, USA
| | - Xiankun Zeng
- Pathology Division, U.S. Army Medical Research Institute of Infectious Diseases, 1425, Porter St., Ft. Detrick, Frederick, MD, 21702, USA
| | - Robert G Stafford
- Molecular and Translational Sciences Division, U.S. Army Medical Research Institute of Infectious Diseases, 1425, Porter St., Ft. Detrick, Frederick, MD, 21702, USA
| | - Sharon Daye
- Pathology Division, U.S. Army Medical Research Institute of Infectious Diseases, 1425, Porter St., Ft. Detrick, Frederick, MD, 21702, USA
| | - Xiang Zhang
- Imaging Probe Development Center, National Heart, Lung, and Blood Institute, National Institutes of Health, 9800 Medical Center Drive, Bldg. B., #2034, Bethesda, MD, 20892, USA
| | - Falguni Basuli
- Imaging Probe Development Center, National Heart, Lung, and Blood Institute, National Institutes of Health, 9800 Medical Center Drive, Bldg. B., #2034, Bethesda, MD, 20892, USA
| | - Joseph W Golden
- Virology Division, U.S. Army Medical Research Institute of Infectious Diseases, 1425, Porter St., Ft. Detrick, Frederick, MD, 21702, USA
| | - Rolf E Swenson
- Imaging Probe Development Center, National Heart, Lung, and Blood Institute, National Institutes of Health, 9800 Medical Center Drive, Bldg. B., #2034, Bethesda, MD, 20892, USA
| | - Darci R Smith
- Virology Division, U.S. Army Medical Research Institute of Infectious Diseases, 1425, Porter St., Ft. Detrick, Frederick, MD, 21702, USA.
| | - Thomas M Bocan
- Molecular and Translational Sciences Division, U.S. Army Medical Research Institute of Infectious Diseases, 1425, Porter St., Ft. Detrick, Frederick, MD, 21702, USA.
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Lee J, Jung JH, Lee BC, Lee SY. Design and Synthesis of Phenoxypyridyl Acetamide or Aryl-oxodihydropurine Derivatives for the Development of Novel PET Ligands Targeting the Translocator Protein 18 kDa (TSPO). B KOREAN CHEM SOC 2016. [DOI: 10.1002/bkcs.10979] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Jihye Lee
- Neuroscience Research Institute; Gachon University; Incheon 21565 Korea
| | - Jae Ho Jung
- Department of Nuclear Medicine; Seoul National University College of Medicine, Seoul National University Bundang Hospital; Seongnam 13620 Korea
| | - Byung Chul Lee
- Department of Nuclear Medicine; Seoul National University College of Medicine, Seoul National University Bundang Hospital; Seongnam 13620 Korea
- Center for Nanomolecular Imaging and Innovative Drug Development; Advanced Institutes of Convergence Technology; Suwon 16229 Korea
| | - Sang-Yoon Lee
- Neuroscience Research Institute; Gachon University; Incheon 21565 Korea
- Department of Neuroscience, College of Medicine; Gachon University; Incheon 21936 Korea
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Damont A, Marguet F, Puech F, Dollé F. Synthesis and in vitro characterization of novel fluorinated derivatives of the TSPO 18 kDa ligand SSR180575. Eur J Med Chem 2015. [DOI: 10.1016/j.ejmech.2015.07.033] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Médran-Navarrete V, Bernards N, Kuhnast B, Damont A, Pottier G, Peyronneau MA, Kassiou M, Marguet F, Puech F, Boisgard R, Dollé F. [18F]DPA-C5yne, a novel fluorine-18-labelled analogue of DPA-714: radiosynthesis and preliminary evaluation as a radiotracer for imaging neuroinflammation with PET. J Labelled Comp Radiopharm 2014; 57:410-8. [PMID: 24764161 DOI: 10.1002/jlcr.3199] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 03/17/2014] [Accepted: 03/19/2014] [Indexed: 12/13/2022]
Abstract
DPA-C5yne, the lead compound of a novel series of DPA-714 derivatives in which the fluoroethoxy chain linked to the phenylpyrazolopyrimidine scaffold has been replaced by a fluoroalkyn-1-yl moiety, is a high affinity (Ki : 0.35 nM) and selective ligand targeting the translocator protein 18 kDa. In the present work, DPA-C5yne was labelled with no-carrier-added [(18)F]fluoride based on a one-step tosyloxy-for-fluorine nucleophilic substitution reaction, purified by cartridge and HPLC, and formulated as an i.v. injectable solution using a TRACERLab FX N Pro synthesizer. Typically, 4.3-5.2 GBq of [(18)F]DPA-C5yne, ready-to-use, chemically and radiochemically pure (> 95%), was obtained with specific radioactivities ranging from 55 to 110 GBq/µmol within 50-60 min, starting from a 30 GBq [(18)F]fluoride batch (14-17%). LogP and LogD of [(18)F]DPA-C5yne were measured using the shake-flask method and values of 2.39 and 2.51 were found, respectively. Autoradiography studies performed on slices of ((R,S)-α-amino-3-hydroxy-5-methyl-4-isoxazolopropionique (AMPA)-lesioned rat brains showed a high target-to-background ratio (1.9 ± 0.3). Selectivity and specificity of the binding for the translocator protein was demonstrated using DPA-C5yne (unlabelled), PK11195 and Flumazenil (central benzodiazepine receptor ligand) as competitors. Furthermore, DPA-C5yne proved to be stable in plasma at 37°C for at least 90 min.
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Médran-Navarrete V, Damont A, Peyronneau MA, Kuhnast B, Bernards N, Pottier G, Marguet F, Puech F, Boisgard R, Dollé F. Preparation and evaluation of novel pyrazolo[1,5-a]pyrimidine acetamides, closely related to DPA-714, as potent ligands for imaging the TSPO 18kDa with PET. Bioorg Med Chem Lett 2014; 24:1550-6. [DOI: 10.1016/j.bmcl.2014.01.080] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Revised: 01/24/2014] [Accepted: 01/27/2014] [Indexed: 12/13/2022]
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Damont A, Lemée F, Raggiri G, Dollé F. Novel 2,4,5-Trisubstituted Pyridines as Key Intermediates for the Preparation of the TSPO Ligand 6-F-PBR28: Synthesis and Full1H and13C NMR Characterization. J Heterocycl Chem 2013. [DOI: 10.1002/jhet.1723] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | - Frédéric Lemée
- CEA; I²BM, Service Hospitalier Frédéric Joliot; Orsay France
| | | | - Frédéric Dollé
- CEA; I²BM, Service Hospitalier Frédéric Joliot; Orsay France
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Damont A, Roeda D, Dollé F. The potential of carbon-11 and fluorine-18 chemistry: illustration through the development of positron emission tomography radioligands targeting the translocator protein 18 kDa. J Labelled Comp Radiopharm 2013; 56:96-104. [DOI: 10.1002/jlcr.2992] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2012] [Revised: 07/18/2012] [Accepted: 11/06/2012] [Indexed: 11/05/2022]
Affiliation(s)
- Annelaure Damont
- CEA, I2BM, Service Hospitalier Frédéric Joliot; 4 place du Général Leclerc; F-91406; Orsay; France
| | - Dirk Roeda
- CEA, I2BM, Service Hospitalier Frédéric Joliot; 4 place du Général Leclerc; F-91406; Orsay; France
| | - Frédéric Dollé
- CEA, I2BM, Service Hospitalier Frédéric Joliot; 4 place du Général Leclerc; F-91406; Orsay; France
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Cerutti E, Damont A, Dollé F, Baroni S, Aime S. Synthesis and characterization of an MRI Gd-based probe designed to target the translocator protein. Magn Reson Chem 2013; 51:116-122. [PMID: 23303709 DOI: 10.1002/mrc.3919] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Revised: 09/12/2012] [Accepted: 12/11/2012] [Indexed: 06/01/2023]
Abstract
DPA-713 is the lead compound of a recently reported pyrazolo[1,5-a]pyrimidineacetamide series, targeting the translocator protein (TSPO 18 kDa), and as such, this structure, as well as closely related derivatives, have been already successfully used as positron emission tomography radioligands. On the basis of the pharmacological core of this ligands series, a new magnetic resonance imaging probe, coded DPA-C(6)-(Gd)DOTAMA was designed and successfully synthesized in six steps and 13% overall yield from DPA-713. The Gd-DOTA monoamide cage (DOTA = 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) represents the magnetic resonance imaging reporter, which is spaced from the phenylpyrazolo[1,5-a]pyrimidineacetamide moiety (DPA-713 motif) by a six carbon-atom chain. DPA-C(6)-(Gd)DOTAMA relaxometric characterization showed the typical behavior of a small-sized molecule (relaxivity value: 6.02 mM(-1) s(-1) at 20 MHz). The good hydrophilicity of the metal chelate makes DPA-C(6)-(Gd)DOTAMA soluble in water, affecting thus its biodistribution with respect to the parent lipophilic DPA-713 molecule. For this reason, it was deemed of interest to load the probe to a large carrier in order to increase its residence lifetime in blood. Whereas DPA-C(6)-(Gd)DOTAMA binds to serum albumin with a low affinity constant, it can be entrapped into liposomes (both in the membrane and in the inner aqueous cavity). The stability of the supramolecular adduct formed by the Gd-complex and liposomes was assessed by a competition test with albumin.
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Affiliation(s)
- Erika Cerutti
- Dipartimento di Chimica and Centro di Imaging Molecolare, Università degli Studi di Torino, Torino, Italy
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Ching AS, Kuhnast B, Damont A, Roeda D, Tavitian B, Dollé F. Current paradigm of the 18-kDa translocator protein (TSPO) as a molecular target for PET imaging in neuroinflammation and neurodegenerative diseases. Insights Imaging 2012; 3:111-9. [PMID: 22696004 DOI: 10.1007/s13244-011-0128-x] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2011] [Revised: 06/18/2011] [Accepted: 09/09/2011] [Indexed: 11/08/2022] Open
Abstract
Neuroinflammation is a process characterised by drastic changes in microglial morphology and by marked upregulation of the 18-kDa translocator protein (TSPO) on the mitochondria. The continual increase in incidence of neuroinflammation and neurodegenerative diseases poses a major health issue in many countries, requiring more innovative diagnostic and monitoring tools. TSPO expression may constitute a biomarker for brain inflammation that could be monitored by using TSPO tracers as neuroimaging agents. From medical imaging perspectives, this review focuses on the current concepts related to the TSPO, and discusses briefly on the status of its PET imaging related to neuroinflammation and neurodegenerative diseases in humans.
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Damont A, Boisgard R, Kuhnast B, Lemée F, Raggiri G, Scarf AM, Da Pozzo E, Selleri S, Martini C, Tavitian B, Kassiou M, Dollé F. Synthesis of 6-[¹⁸F]fluoro-PBR28, a novel radiotracer for imaging the TSPO 18 kDa with PET. Bioorg Med Chem Lett 2011; 21:4819-22. [PMID: 21741237 DOI: 10.1016/j.bmcl.2011.06.048] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2011] [Revised: 06/09/2011] [Accepted: 06/11/2011] [Indexed: 11/19/2022]
Abstract
6-Fluoro-PBR28 (N-(6-fluoro-4-phenoxypyridin-3-yl)-N-(2-methoxybenzyl)acetamide), a fluorinated analogue of the recently developed TSPO 18 kDa ligand PBR28, was synthesized and labelled with fluorine-18. 6-Fluoro-PBR28 and its 6-chloro/6-bromo counterparts were synthesized in six chemical steps and obtained in 16%, 10% and 19% overall yields, respectively. Labelling with fluorine-18 was performed in one single step (chlorine/bromine-for-fluorine heteroaromatic substitution) using a Zymate-XP robotic system affording HPLC-purified, ready-to-inject, 6-[(18)F]fluoro-PBR28 (>95% radiochemically pure). Non-decay-corrected overall yields were 9-10% and specific radioactivities ranged from 74 to 148 GBq/μmol. In vitro binding experiments, dynamic μPET studies performed in a rat model of acute neuroinflammation (unilaterally, AMPA-induced, striatum-lesioned rats) and ex vivo autoradiography on the same model demonstrated the potential of 6-[(18)F]fluoro-PBR28 to image the TSPO 18 kDa using PET.
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