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Fu H, Rong J, Chen Z, Zhou J, Collier T, Liang SH. Positron Emission Tomography (PET) Imaging Tracers for Serotonin Receptors. J Med Chem 2022; 65:10755-10808. [PMID: 35939391 DOI: 10.1021/acs.jmedchem.2c00633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Serotonin (5-hydroxytryptamine, 5-HT) and 5-HT receptors (5-HTRs) have crucial roles in various neuropsychiatric disorders and neurodegenerative diseases, making them attractive diagnostic and therapeutic targets. Positron emission tomography (PET) is a noninvasive nuclear molecular imaging technique and is an essential tool in clinical diagnosis and drug discovery. In this context, numerous PET ligands have been developed for "visualizing" 5-HTRs in the brain and translated into human use to study disease mechanisms and/or support drug development. Herein, we present a comprehensive repertoire of 5-HTR PET ligands by focusing on their chemotypes and performance in PET imaging studies. Furthermore, this Perspective summarizes recent 5-HTR-focused drug discovery, including biased agonists and allosteric modulators, which would stimulate the development of more potent and subtype-selective 5-HTR PET ligands and thus further our understanding of 5-HTR biology.
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Affiliation(s)
- Hualong Fu
- Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Jian Rong
- Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital, Boston, Massachusetts 02114, United States.,Department of Radiology, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Zhen Chen
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China
| | - Jingyin Zhou
- Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Thomas Collier
- Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital, Boston, Massachusetts 02114, United States.,Department of Radiology, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Steven H Liang
- Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital, Boston, Massachusetts 02114, United States.,Department of Radiology, Harvard Medical School, Boston, Massachusetts 02115, United States
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2
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Rangaswamy S, Varshney R, Tiwari AK, Sethi SK, Hemanth kumar BS, Ojha H, Sandeep Kaur‐Ghumaan, Mishra AK. Gd(III)‐DO3A‐SBMPP: An Effort to Develop the MRI Contrast Agent with Enhanced Relaxivity. ChemistrySelect 2016. [DOI: 10.1002/slct.201600814] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Sandhya Rangaswamy
- Institute of Nuclear Medicine and Allied Sciences Brig. S. K. Mazumdar Marg Delhi 110054 India
- Department of Chemistry University of Delhi Delhi 110007 India
| | - Raunak Varshney
- Institute of Nuclear Medicine and Allied Sciences Brig. S. K. Mazumdar Marg Delhi 110054 India
| | - Anjani K. Tiwari
- Institute of Nuclear Medicine and Allied Sciences Brig. S. K. Mazumdar Marg Delhi 110054 India
| | - Swarndeep K. Sethi
- Institute of Nuclear Medicine and Allied Sciences Brig. S. K. Mazumdar Marg Delhi 110054 India
- Department of Chemistry University of Delhi Delhi 110007 India
| | - B. S. Hemanth kumar
- Institute of Nuclear Medicine and Allied Sciences Brig. S. K. Mazumdar Marg Delhi 110054 India
| | - Himanshu Ojha
- Institute of Nuclear Medicine and Allied Sciences Brig. S. K. Mazumdar Marg Delhi 110054 India
| | | | - Anil K. Mishra
- Institute of Nuclear Medicine and Allied Sciences Brig. S. K. Mazumdar Marg Delhi 110054 India
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3
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Hazari PP, Prakash S, Meena VK, Singh N, Chuttani K, Chadha N, Singh P, Kukreti S, Mishra AK. Synthesis, preclinical evaluation and molecular modelling of macrocyclic appended 1-(2-methoxyphenyl)piperazine for 5-HT1A neuroreceptor imaging. RSC Adv 2016. [DOI: 10.1039/c5ra13432c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An efficient approach in the design and synthesis of a multi-functional chelating agent based on 1-(2-methoxyphenyl)piperazine for targeting 5-HT1A receptors in brain was envisaged.
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Affiliation(s)
- Puja Panwar Hazari
- Division of Cyclotron and Radiopharmaceutical Sciences
- Institute of Nuclear Medicine and Allied Sciences
- Delhi-110054
- India
| | - Surbhi Prakash
- Division of Cyclotron and Radiopharmaceutical Sciences
- Institute of Nuclear Medicine and Allied Sciences
- Delhi-110054
- India
- Department of Chemistry
| | - Virendra Kumar Meena
- Division of Cyclotron and Radiopharmaceutical Sciences
- Institute of Nuclear Medicine and Allied Sciences
- Delhi-110054
- India
- Department of Chemistry
| | - Niraj Singh
- Division of Cyclotron and Radiopharmaceutical Sciences
- Institute of Nuclear Medicine and Allied Sciences
- Delhi-110054
- India
| | - Krishna Chuttani
- Division of Cyclotron and Radiopharmaceutical Sciences
- Institute of Nuclear Medicine and Allied Sciences
- Delhi-110054
- India
| | - Nidhi Chadha
- Division of Cyclotron and Radiopharmaceutical Sciences
- Institute of Nuclear Medicine and Allied Sciences
- Delhi-110054
- India
| | - Pooja Singh
- Division of Cyclotron and Radiopharmaceutical Sciences
- Institute of Nuclear Medicine and Allied Sciences
- Delhi-110054
- India
- Department of Chemistry
| | | | - Anil Kumar Mishra
- Division of Cyclotron and Radiopharmaceutical Sciences
- Institute of Nuclear Medicine and Allied Sciences
- Delhi-110054
- India
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4
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Hassanzadeh L, Erfani M, Sadat Ebrahimi SE. 2-Amino-3-(1-(4-(4-(2-methoxyphenyl) piperazine-1-yl)butyl)-1H-1,2,3-triazol-4-yl) propanoic acid: synthesized,99mTc-tricarbonyl labeled, and bioevaluated as a potential 5HT1Areceptor ligand. J Labelled Comp Radiopharm 2012. [DOI: 10.1002/jlcr.2953] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Leila Hassanzadeh
- Department of Medicinal Chemistry, Faculty of Pharmacy; Tehran University of Medical Sciences; PO Box 6446-14155; Tehran; Iran
| | - Mostafa Erfani
- Nuclear Science Research School, Nuclear Science & Technology Research Institute (NSTRI); Atomic Energy Organization of Iran (AEOI); Karegar Avenue, PO Box 11365-3486; Tehran; Iran
| | - Seyed Esmaeil Sadat Ebrahimi
- Department of Medicinal Chemistry, Faculty of Pharmacy; Tehran University of Medical Sciences; PO Box 6446-14155; Tehran; Iran
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5
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Chiotellis A, Tsoukalas C, Pelecanou M, Pirmettis I, Papadopoulos M. Synthesis, characterization and biological evaluation of novel neutral fac-M(CO)3(SNO) complexes (M=Re, 99mTc) bearing the o-methoxyphenylpiperazine moiety. Appl Radiat Isot 2012; 70:957-64. [PMID: 22464790 DOI: 10.1016/j.apradiso.2012.03.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2011] [Revised: 12/07/2011] [Accepted: 03/01/2012] [Indexed: 10/28/2022]
Abstract
The synthesis, characterization and biological evaluation of two new neutral tricarbonyl fac-M(CO)(3)(SNO) (M=Re, (99m)Tc) bearing o-methoxyphenylpiperazine as pharmacophore and S-functionalized cysteine or penicillamine as chelators are reported. Competition binding tests showed good affinity for the 5-HT(1A) receptor (8 and 54 nM for 4a and 4b, respectively). Biodistribution studies in healthy animals showed high initial blood and liver uptake, fast blood and tissue depuration and negligible brain uptake.
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Affiliation(s)
- A Chiotellis
- Institute of Radioisotopes, Radiodiagnostic Products, National Centre for Scientific Research Demokritos, Athens, Greece
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6
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Chiotellis A, Tsoukalas C, Pelecanou M, Pirmettis I, Papadopoulos M. New 99mTc(CO)3(NNO) complexes in the development of 5HT1A receptor imaging agents. RADIOCHIM ACTA 2011. [DOI: 10.1524/ract.2011.1835] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
In this work we report the synthesis, characterization and biological evaluation of two new neutral tricarbonyl fac-M(CO)3(NNO) (M=Re, 99mTc) derivatives of WAY-100635 as potential 99mTc agents for the in vivo imaging of 5HT1A receptors. The new pharmacophore NNO ligands are based on the picolylamine N,N-diacetic acid (PADA) ligand and their synthesis was achieved through the PADA anhydride, showing thus the applicability of this synthetic approach, developed in our laboratory, for the incorporation of bioactive amines in the PADA molecule and the development of target specific radiopharmaceuticals. The rhenium complexes were synthesized using [NEt4]2[Re(CO)3Br3] as a precursor and fully characterized by elemental analysis and spectroscopic methods. The analogous technetium-99m complexes were also prepared quantitatively using the [99mTc(CO)3(H2O)3]+ precursor and their structure corroborated by means of the rhenium complexes. The lipophilicity of the Tc complexes is in the range normally accepted for substances to be able to cross the BBB. Competition binding tests showed moderate affinity for the 5HT1A receptors, with IC50 values at the nanomolar range (30 and 116 nM). Biodistribution in healthy animals was characterized by high initial blood and liver uptake and fast blood and tissue depuration with excretion taking place mainly through the hepatobiliary system. None of the new complexes showed any significant brain uptake, suggesting that the ability of a compound to cross the BBB is determined by more factors than charge, lipophilicity and size.
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Affiliation(s)
- A. Chiotellis
- National Centre for Scientific Research “Demokritos“, Institute of Radioisotopes - Radiodiagnostic Produ, Athens, Griechenland
| | | | - M. Pelecanou
- National Centre for Scientific Research Demokritos, Institute of Biology, Athens, Griechenland
| | - I. Pirmettis
- National Centre for Scientific Research Demokritos, Institute of Radioisotopes - Radiodiagnostic Produ, Athens, Griechenland
| | - M. Papadopoulos
- National Centre for Scientific Research Demokritos, Institute of Radioisotopes - Radiodiagnostic Produ, Athens, Griechenland
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7
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Choi JY, Kim CH, Kim JY, Ha HJ, Ryu YH. An Efficient Synthesis of trans-N-{2-[4-(2-Methoxyphenyl)piperazinyl]ethyl}-N-(2-pyridyl)-N-(4-tosyloxymethylcyclohexane)carboxamide, A Precursor of [18. B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.8.2371] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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9
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McCarron JA, Marchais-Oberwinkler S, Pike VW, Tarkiainen J, Halldin C, Sóvagó J, Gulyas B, Wikström HV, Farde L. Two C-Methyl Derivatives of [11C]WAY-100635 – Effects of an Amido α-Methyl Group on Metabolism and Brain 5-HT1A Receptor Radioligand Behavior in Monkey*. Mol Imaging Biol 2005; 7:209-19. [PMID: 15912425 DOI: 10.1007/s11307-005-4127-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
PURPOSE [carbonyl-11C]N-(2-(1-(4-(2-methoxyphenyl)-piperazinyl)ethyl)-N-pyridinyl)cyclohexanecarboxamide ([carbonyl-11C]WAY-100635) is an effective radioligand for imaging brain 5-HT1A receptors with positron emission tomography (PET). However, this radioligand has some drawbacks for deriving relative regional receptor densities, including rapid metabolism, which acts against accurate definition of an arterial input function for compartmental modeling, and very low nonspecific binding in brain, which detracts from the accuracy of modeling by a simplified reference tissue (cerebellum) approach. Here, in a search for a radioligand that overcomes these limitations, we investigated the effects of introducing a single methyl group at either of the carbon atoms alpha to the amide bond in [11C]WAY-100635. PROCEDURES Ligands with a methyl group on the alpha carbon of the cyclohexyl group (SWAY) or the alpha carbon of the C2H4 linker ((R,S)-JWAY) were synthesized and tested for binding affinity and intrinsic activity at 5-HT1A receptors. SWAY was labeled with carbon-11 (t1/2 = 20.4 minutes; beta+ = 99.8%) in its O-methyl group and (R,S)-JWAY in its carbonyl group. Each radioligand was evaluated by PET experiments in cynomolgus monkey. RESULTS SWAY and (R,S)-JWAY were found to be high-affinity antagonists at 5-HT1A receptors. After injection of [11C]SWAY into monkey, radioactivity uptake in brain reached a maximum of 3% at 4.5 minutes and decreased to 0.7% at 72 minutes. However, over the time span of the experiment, radioactivity concentrations in 5-HT1A receptor-rich brain regions were only fractionally higher than in cerebellum. Radioactivity represented by parent radioligand in plasma was 39% at 45 minutes. After injection of [11C](R,S)-JWAY alone, radioactivity uptake in brain reached a maximum of 4.8% at 2.5 minutes and decreased to 1.2% at 90 minutes. At this time, radioactivity concentration in 5-HT1A receptor-rich brain regions was markedly greater than in cerebellum. In another PET experiment, the monkey was predosed with WAY-100635 before [11C](R,S)-JWAY injection. At 90 minutes after injection, the ratio of radioactivity in 5-HT1A receptor-rich regions to that in cerebellum was reduced to near unity. Radioactivity represented by parent radioligand in plasma was 12% at 45 minutes. CONCLUSIONS [11C](R,S)-JWAY, but not [11C]SWAY, gives a sizeable 5-HT1A receptor-selective PET signal in monkey. The presence of a C-methyl group adjacent to the amide bond in SWAY or (R,S)-JWAY fails to counter metabolism.
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Affiliation(s)
- Julie A McCarron
- MRC Cyclotron Unit, Imperial College School of Medicine, Hammersmith Hospital, Ducane Road, London, W12 0NN, UK.
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10
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Marchais-Oberwinkler S, Nowicki B, Pike VW, Halldin C, Sandell J, Chou YH, Gulyas B, Brennum LT, Farde L, Wikström HV. N-Oxide analogs of WAY-100635: new high affinity 5-HT1A receptor antagonists. Bioorg Med Chem 2005; 13:883-93. [PMID: 15653354 DOI: 10.1016/j.bmc.2004.10.033] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2003] [Accepted: 10/13/2004] [Indexed: 11/30/2022]
Abstract
WAY-100635 [N-(2-(1-(4-(2-methoxyphenyl)piperazinyl)ethyl))-N-(2-pyridinyl)cyclohexanecarboxamide] 1 and its O-desmethyl derivative DWAY 2 are well-known high affinity 5-HT(1A) receptor antagonists, which when labeled with carbon-11 (beta+; t(1/2) = 20.4 min) in the carbonyl group are effective radioligands for imaging brain 5-HT(1A) receptors with positron emission tomography (PET). In a search for new 5-HT(1A) antagonists with different pharmacokinetic and metabolic properties, the pyridinyl N-oxide moiety was incorporated into analogs of 1 and 2. NOWAY 3, in which the pyridinyl ring of 1 was oxidized to the pyridinyl N-oxide, was prepared via nucleophilic substitution of 2-[4-(2-methoxyphenyl)piperazin-1-yl]ethylamine on 2-chloropyridine-N-oxide followed by acylation with cyclohexanecarbonyl chloride. 6Cl-NOWAY 4, a more lipophilic (pyridinyl-6)-chloro derivative of 3, was prepared by treating 1-(2-methoxyphenyl)-4-(2-(2-(6-bromo)aminopyridinyl-N-oxide)ethyl)piperazine with cyclohexanecarbonyl chloride for acylation and concomitant chloro for bromo substitution. NEWWAY 5, in which the 2-hydroxy-phenyl group of 2 is replaced with a 2-pyridinyl N-oxide group with the intention of mimicking the topology of 2, was prepared in five steps from 2-(chloroacetylamino)pyridine. N-Oxides 3-5 were found to be high affinity antagonists at 5-HT(1A) receptors, with 3 having the highest affinity and a Ki value (0.22 nM) comparable to that of 1 (0.17 nM). By calculation the lipophilicity of 3 (LogP = 1.87) is lower than that of 1 by 1.25 LogP units while TLC and reverse phase HPLC indicate that 3 has slightly lower lipophilicity than 1. On the basis of these encouraging findings, the N-oxide 3 was selected for labeling with carbon-11 in its carbonyl group and for evaluation as a radioligand with PET. After intravenous injection of [carbonyl-11C]3 into cynomolgus monkey there was very low uptake of radioactivity into brain and no PET image of brain 5-HT(1A) receptors was obtained. Either 3 inadequately penetrates the blood-brain barrier or it is excluded from brain by an active efflux mechanism. Rapid deacylation of 3 was not apparent in vivo; in cynomolgus monkey plasma radioactive metabolites of [carbonyl-11C]3 appeared less rapidly than from the radioligands [carbonyl-11C]1 and [carbonyl-11C]2, which are known to be primarily metabolized by deacylation. Ligand 3 may have value as a new pharmacological tool, but not as a radioligand for brain imaging.
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Affiliation(s)
- Sandrine Marchais-Oberwinkler
- Department of Medicinal Chemistry, University Center for Pharmacy, University of Groningen, Antonius Deusinglaan 1, NL-9713 AV Groningen, The Netherlands.
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11
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Karramkam M, Hinnen F, Berrehouma M, Hlavacek C, Vaufrey F, Halldin C, McCarron JA, Pike VW, Dollé F. Synthesis of a [6-pyridinyl-18F]-labelled fluoro derivative of WAY-100635 as a candidate radioligand for brain 5-HT1A receptor imaging with PET. Bioorg Med Chem 2003; 11:2769-82. [PMID: 12788351 DOI: 10.1016/s0968-0896(03)00225-6] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
In recent years, considerable effort has been spent on the design, synthesis and pharmacological characterization of radiofluorinated derivatives of the 5-HT(1A) receptor antagonist, WAY-100635, for the in vivo study of these receptors in human brain with PET. (Pyridinyl-6)-fluoro- and (pyridinyl-5)-fluoro-analogues of WAY-100635 (6-fluoro and 5-fluoro-WAY-100635, 5a/6a) were synthesized as well as the corresponding chloro-, bromo- and nitro-derivatives as precursors for labelling (5b-d and 6b-d). Comparative radiolabelling of these precursors with fluorine-18 (positron-emitting isotope, 109.8 min half-life) clearly demonstrated that only ortho-fluorination in this pyridine series, and not meta-fluorination, is of interest for the preparation of a radioligand by nucleophilic heteroaromatic substitution. 6-[(18)F]Fluoro-WAY-100635 ([(18)F]5a) can be efficiently synthesized in one step, either from the corresponding 6-bromo precursor (using conventional heating at 145 degrees C for 10 min) or from the corresponding 6-nitro precursor (using microwave activation at 100 W for 1 min). Typically, 15-25 mCi (0.55-0.92 GBq) of 6-[(18)F]fluoro-WAY-100635 ([(18)F]5a, 1-2 Ci/micromol or 37-72 GBq/micromol) were obtained in 50-70 min starting from a 100 mCi (3.7 GBq) aliquot of a batch of cyclotron-produced [(18)F]fluoride. This (18)F-labelled radioligand is now being evaluated in PET studies.
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Affiliation(s)
- Mylène Karramkam
- Service Hospitalier Frédéric Joliot, Département de Recherche Médicale, CEA, 4 place du Général Leclerc, F-91401 Orsay, France
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12
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González-Gómez JC, Santana L, Uriarte E, Brea J, Villazón M, Loza MI, De Luca M, Rivas ME, Montenegro GY, Fontenla JA. New arylpiperazine derivatives with high affinity for alpha1A, D2 and 5-HT2A receptors. Bioorg Med Chem Lett 2003; 13:175-8. [PMID: 12482418 DOI: 10.1016/s0960-894x(02)00933-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A series of novel long-chain arylpiperazines bearing a coumarin fragment was synthesized and the compounds were evaluated for their affinity at alpha(1), D(2 )and 5-HT(2A) receptors. Most of the new compounds showed high affinity for the three types of receptors alpha(1A), D(2) and 5-HT(2A) which depends, fundamentally, on the substitution of the N(4) of the piperazine ring. From the series emerged compound 6, which had an haloperidol-like profile at D(2) and 5HT(2A) receptors (pK(i) values of 7.93 and 6.76 respectively). The higher alpha(1A) receptor affinity (pA(2)=9.07) of this compound could contribute to a more atypical antipsychotic profile than the haloperidol.
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MESH Headings
- Algorithms
- Animals
- Aorta, Thoracic/drug effects
- Coumarins/chemistry
- Dopamine Antagonists/pharmacology
- Haloperidol/pharmacology
- In Vitro Techniques
- Indicators and Reagents
- Male
- Muscle, Smooth, Vascular/drug effects
- Piperazines/chemical synthesis
- Piperazines/pharmacology
- Rats
- Rats, Sprague-Dawley
- Receptor, Serotonin, 5-HT2A
- Receptors, Adrenergic, alpha-1/drug effects
- Receptors, Dopamine D2/drug effects
- Receptors, Serotonin/drug effects
- Structure-Activity Relationship
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Affiliation(s)
- J C González-Gómez
- Department of Organic Chemistry, Faculty of Pharmacy, University of Santiago, Campus Sur s/n, E-15782 Santiago de Compostela, Spain.
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13
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Nettekoven M, Jenny C. The Development of a Practical and Reliable Large-Scale Synthesis of 2,6-Diamino-4-bromopyridine. Org Process Res Dev 2002. [DOI: 10.1021/op020085j] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Matthias Nettekoven
- F. Hoffmann-La Roche AG, Lead Generation, CH-4070 Basel, Switzerland, and F. Hoffmann-La Roche AG, Kilo-Laboratories, CH-4070 Basel, Switzerland
| | - Christian Jenny
- F. Hoffmann-La Roche AG, Lead Generation, CH-4070 Basel, Switzerland, and F. Hoffmann-La Roche AG, Kilo-Laboratories, CH-4070 Basel, Switzerland
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14
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Papagiannopoulou D, Pirmettis I, Tsoukalas C, Nikoladou L, Drossopoulou G, Dalla C, Pelecanou M, Papadopoulou-Daifotis Z, Papadopoulos M, Chiotellis E. Oxotechnetium 99mTcO[SN(R)S][S] complexes as potential 5-HT1A receptor imaging agents. Nucl Med Biol 2002; 29:825-32. [PMID: 12453592 DOI: 10.1016/s0969-8051(02)00343-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A series of 99mTcO[SN(R)S][S] complexes carrying the 1-(2-methoxyphenyl)piperazine moiety on the tridentate ligand [SN(R)S] was synthesized. For structural characterization and for in vitro binding assays the analogous oxorhenium complexes were prepared. As demonstrated by appropriate competition binding tests in rat hippocampal preparations, all oxorhenium analogues showed affinity for the 5-HT(1A) receptor binding sites with IC(50) values at the nanomolar range (IC(50)= 5.8-103 nM). All 99mTcO[SN(R)S]/[S] complexes showed significant brain uptake in rats at 2 min p.i. (0.24-1.31% ID). However, a clear correlation between distribution of radioactivity in the brain and distribution of 5-HT(1A) receptors could not be established.
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Affiliation(s)
- D Papagiannopoulou
- Institute of Radioisotopes-Radiodiagnostic Products, National Center for Scientific Research Demokritos, 15310 Ag. Paraskevi, Athens, Greece
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15
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Barlocco D. Monitor: molecules and profiles. Drug Discov Today 2001; 6:915-916. [PMID: 11522520 DOI: 10.1016/s1359-6446(01)01921-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- D Barlocco
- University of Milan, Viale Abruzzi 42 -20131, Tel: +39 02 2950 2223 fax: +39 02 2951 4197, Milano, Italy
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16
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Sandell J, Halldin C, Pike VW, Chou YH, Varnäs K, Hall H, Marchais S, Nowicki B, Wikström HV, Swahn CG, Farde L. New halogenated [11C]WAY analogues, [11C]6FPWAY and [11C]6BPWAY--radiosynthesis and assessment as radioligands for the study of brain 5-HT1A receptors in living monkey. Nucl Med Biol 2001; 28:177-85. [PMID: 11295428 DOI: 10.1016/s0969-8051(00)00181-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
[Carbonyl-(11)C]WAY-100635 ([(11)C]WAY) is an established radioligand for the study of brain serotonin(1A) (5-HT(1A)) receptors in living animals and humans with positron emission tomography (PET). There is a recognised need to develop halogenated ligands for 5-HT(1A) receptors, either for labelling with longer-lived fluorine-18 for more widespread application with PET or with iodine-123 for application with single photon emission tomography (SPET). Here we used autoradiography and PET to assess two new halogenated analogues of WAY, namely 6BPWAY and 6FPWAY [N-(2-(1-(4-(2-methoxyphenyl)-piperazinyl)ethyl))-N-(2-(6-bromo-/fluoro-pyridinyl))cyclohexanecarboxamide] as prospective radioligands, initially using carbon-11 as the radiolabel. Labelling of 6BPWAY and 6FPWAY with carbon-11 was accomplished by acylation of the corresponding secondary amine precursors with [carbonyl-(11)C]cyclohexanecarbonyl chloride. After incubation of human brain crysections with [(11)C]6BPWAY or [(11)C]6FPWAY, the highest accumulation of radioactivity was observed in cortical areas and the hippocampal formation. Both radioligands had high nonspecific binding. There was a rapid accumulation of radioactivity in the monkey brain after intravenous injection of [(11)C]6BPWAY and [(11)C]6FPWAY. High accumulation of radioactivity was observed in the frontal and temporal cortex and the raphe nuclei, areas known to contain a high density of 5-HT(1A) receptors. The ratios of radioactivity in receptor-rich temporal cortex to that in receptor-poor cerebellum at peak equilibrium were 1.9 (at 10 min) and 3.0 at (at 20 min) for [(11)C]6BPWAY and [(11)C]6FPWAY, respectively. In pretreatment experiments with high doses of unlabelled WAY, the level of radioactivity in the frontal and temporal cortex and the raphe nuclei was reduced to the same level as in the cerebellum. Radioactive metabolites of [(11)C]6FPWAY appeared at a rate similar to those for [(11)C]WAY, with 17% of the radioactivity in plasma represented by unchanged radioligand after 40 min. Radioactive metabolites of [(11)C]6BPWAY appeared much more slowly. At 40 min after injection 45% of the radioactivity in plasma still represented unchanged radioligand. The results indicate that 6-pyridinyl radiohalogented analogues of WAY are new leads to radioligands for PET or SPET.
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Affiliation(s)
- J Sandell
- Karolinska Institutet, Department of Clinical Neuroscience, Psychiatry Section, Karolinska Hospital, S-171 76, Stockholm, Sweden.
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