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Narayanaswami V, Tong J, Fiorino F, Severino B, Sparaco R, Magli E, Giordano F, Bloomfield PM, Prabhakaran J, Mann JJ, Vasdev N, Dahl K, Kumar JSD. Synthesis, in vitro and in vivo evaluation of 11C-O-methylated arylpiperazines as potential serotonin 1A (5-HT 1A) receptor antagonist radiotracers. EJNMMI Radiopharm Chem 2020; 5:13. [PMID: 32430632 PMCID: PMC7237647 DOI: 10.1186/s41181-020-00096-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 04/23/2020] [Indexed: 01/23/2023] Open
Abstract
Background Serotonin 1A (5-HT1A) receptors are implicated in the pathogenesis of several psychiatric and neurodegenerative disorders motivating the development of suitable radiotracers for in vivo positron emission tomography (PET) neuroimaging. The gold standard PET imaging agent for this target is [carbonyl-11C]WAY-100635, labeled via a technically challenging multi-step reaction that has limited its widespread use. While several antagonist and agonist-based PET radiotracers for 5-HT 1A receptors have been developed, their clinical translation has been hindered by methodological challenges and/or and non-specific binding. As a result, there is continued interest in the development of new and more selective 5-HT1A PET tracers having a relatively easier and reliable radiosynthesis process for routine production and with favorable metabolism to facilitate tracer-kinetic modeling. The purpose of the current study was to develop and characterize a radioligand with suitable characteristics for imaging 5-HT1A receptors in the brain. The current study reports the in vitro characterization and radiosyntheses of three candidate 5-HT1A receptor antagonists, DF-100 (1), DF-300 (2) and DF-400 (3), to explore their suitability as potential PET radiotracers. Results Syntheses of 1–3 and corresponding precursors for radiolabeling were achieved from isonicotinic, picolinic acid or picolino nitrile. In vitro binding studies demonstrated nanomolar affinity of the compounds for 5-HT1A receptors. Binding of 1–3 for other biogenic amines, neurotransmitter receptors, and transporters was negligible with the exception of moderate affinities for α1-adrenergic receptors (4–6-fold less potent than that for 5-HT1A receptor). Radioligands [11C]1–3 were efficiently prepared by 11C-O-methylation of the corresponding phenolic precursor in non-decay corrected radiochemical yields of 7–11% with > 99% chemical and radiochemical purities. Dynamic PET studies in rats demonstrated negligible brain uptake of [11C]1 and [11C]2. In contrast, significant brain uptake of [11C]3 was observed with an early peak SUV of 4–5. However, [11C]3 displayed significant off-target binding attributed to α1-adrenergic receptors based on regional distribution (thalamus>hippocampus) and blocking studies. Conclusion Despite efficient radiolabeling, results from PET imaging experiments limit the application of [11C]3 for in vivo quantification of 5-HT1A receptors. Nevertheless, derivatives of compound 3 may provide a scaffold for alternative PET radiotracers with improved selectivity for 5-HT 1A receptors or α1-adrenergic receptors.
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Affiliation(s)
- Vidya Narayanaswami
- Azrieli Centre for Neuro-Radiochemistry, Research Imaging Centre & Preclinical Imaging, Centre for Addiction and Mental Health, Toronto, Ontario, M5T-1R8, Canada
| | - Junchao Tong
- Azrieli Centre for Neuro-Radiochemistry, Research Imaging Centre & Preclinical Imaging, Centre for Addiction and Mental Health, Toronto, Ontario, M5T-1R8, Canada
| | - Ferdinando Fiorino
- Department of Pharmacy, University of Naples, Via D. Montesano, 49, 8013, Naples, Italy
| | - Beatrice Severino
- Department of Pharmacy, University of Naples, Via D. Montesano, 49, 8013, Naples, Italy
| | - Rosa Sparaco
- Department of Pharmacy, University of Naples, Via D. Montesano, 49, 8013, Naples, Italy
| | - Elisa Magli
- Department of Pharmacy, University of Naples, Via D. Montesano, 49, 8013, Naples, Italy
| | - Flavia Giordano
- Department of Pharmacy, University of Naples, Via D. Montesano, 49, 8013, Naples, Italy
| | - Peter M Bloomfield
- Azrieli Centre for Neuro-Radiochemistry, Research Imaging Centre & Preclinical Imaging, Centre for Addiction and Mental Health, Toronto, Ontario, M5T-1R8, Canada
| | - Jaya Prabhakaran
- Molecular Imaging and Neuropathology Division, New York State Psychiatric Institute, New York, USA
| | - J John Mann
- Molecular Imaging and Neuropathology Division, New York State Psychiatric Institute, New York, USA.,Department of Psychiatry, Columbia University Medical Center, New York, USA
| | - Neil Vasdev
- Azrieli Centre for Neuro-Radiochemistry, Research Imaging Centre & Preclinical Imaging, Centre for Addiction and Mental Health, Toronto, Ontario, M5T-1R8, Canada.,Department of Psychiatry, University of Toronto, Toronto, Ontario, M5T-1R8, Canada
| | - Kenneth Dahl
- Azrieli Centre for Neuro-Radiochemistry, Research Imaging Centre & Preclinical Imaging, Centre for Addiction and Mental Health, Toronto, Ontario, M5T-1R8, Canada.
| | - J S Dileep Kumar
- Molecular Imaging and Neuropathology Division, New York State Psychiatric Institute, New York, USA.
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Magli E, Severino B, Corvino A, Perissutti E, Frecentese F, Saccone I, Giordano F, Castro M, Brea J, Loza MI, Santagada V, Caliendo G, Fiorino F. New Serotoninergic Ligands Containing Indolic and Methyl Indolic Nuclei: Synthesis and In Vitro Pharmacological Evaluation. Med Chem 2019; 16:517-530. [PMID: 31203804 DOI: 10.2174/1573406415666190613153220] [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: 01/16/2019] [Revised: 04/23/2019] [Accepted: 04/29/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND Serotonin is an important biogenic amine and is implicated in wideranging physiological and physiopathological processes. Pharmacological manipulation of the serotoninergic system is believed to have a great therapeutic potential. OBJECTIVES In order to identify selective ligands for 5-HT1A, 5-HT2A and 5-HT2C receptors two series of 4-substituted piperazine derivatives, bearing indolic or methyl indolic nuclei, were synthesized. METHODS All the compounds, synthesized by standard solution methods, were evaluated for 5- HT1A, 5-HT2A and 5-HT2C receptors. The highest affine and selective compounds have been evaluated also on dopaminergic (D1 and D2) and adrenergic (α1A and α2A) receptors. RESULTS Several of the newly synthesized molecules showed affinity in the nanomolar range for 5- HT1A, 5-HT2A and 5-HT2C receptors and moderate to no affinity for other relevant receptors (D1, D2, α1A and α2A). CONCLUSION Compounds 7f and 10a showed a nanomolar affinity towards 5-HT1A with an in vitro pharmacologic profile compatible with antipsychotic drugs.
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Affiliation(s)
- Elisa Magli
- Dipartimento di Farmacia, Universita degli Studi di Napoli "Federico II", Via D. Montesano, 49, 80131, Napoli, Italy
| | - Beatrice Severino
- Dipartimento di Farmacia, Universita degli Studi di Napoli "Federico II", Via D. Montesano, 49, 80131, Napoli, Italy
| | - Angela Corvino
- Dipartimento di Farmacia, Universita degli Studi di Napoli "Federico II", Via D. Montesano, 49, 80131, Napoli, Italy
| | - Elisa Perissutti
- Dipartimento di Farmacia, Universita degli Studi di Napoli "Federico II", Via D. Montesano, 49, 80131, Napoli, Italy
| | - Francesco Frecentese
- Dipartimento di Farmacia, Universita degli Studi di Napoli "Federico II", Via D. Montesano, 49, 80131, Napoli, Italy
| | - Irene Saccone
- Dipartimento di Farmacia, Universita degli Studi di Napoli "Federico II", Via D. Montesano, 49, 80131, Napoli, Italy
| | - Flavia Giordano
- Dipartimento di Farmacia, Universita degli Studi di Napoli "Federico II", Via D. Montesano, 49, 80131, Napoli, Italy
| | - Marián Castro
- USEF Screening Platform-BioFarma Research Group, Center for Research in Molecular Medicine and Chronic Diseases, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - José Brea
- USEF Screening Platform-BioFarma Research Group, Center for Research in Molecular Medicine and Chronic Diseases, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - María I Loza
- USEF Screening Platform-BioFarma Research Group, Center for Research in Molecular Medicine and Chronic Diseases, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Vincenzo Santagada
- Dipartimento di Farmacia, Universita degli Studi di Napoli "Federico II", Via D. Montesano, 49, 80131, Napoli, Italy
| | - Giuseppe Caliendo
- Dipartimento di Farmacia, Universita degli Studi di Napoli "Federico II", Via D. Montesano, 49, 80131, Napoli, Italy
| | - Ferdinando Fiorino
- Dipartimento di Farmacia, Universita degli Studi di Napoli "Federico II", Via D. Montesano, 49, 80131, Napoli, Italy
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Ngo T, Kufareva I, Coleman JL, Graham RM, Abagyan R, Smith NJ. Identifying ligands at orphan GPCRs: current status using structure-based approaches. Br J Pharmacol 2016; 173:2934-51. [PMID: 26837045 PMCID: PMC5341249 DOI: 10.1111/bph.13452] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Revised: 11/18/2015] [Accepted: 01/29/2016] [Indexed: 12/26/2022] Open
Abstract
GPCRs are the most successful pharmaceutical targets in history. Nevertheless, the pharmacology of many GPCRs remains inaccessible as their endogenous or exogenous modulators have not been discovered. Tools that explore the physiological functions and pharmacological potential of these 'orphan' GPCRs, whether they are endogenous and/or surrogate ligands, are therefore of paramount importance. Rates of receptor deorphanization determined by traditional reverse pharmacology methods have slowed, indicating a need for the development of more sophisticated and efficient ligand screening approaches. Here, we discuss the use of structure-based ligand discovery approaches to identify small molecule modulators for exploring the function of orphan GPCRs. These studies have been buoyed by the growing number of GPCR crystal structures solved in the past decade, providing a broad range of template structures for homology modelling of orphans. This review discusses the methods used to establish the appropriate signalling assays to test orphan receptor activity and provides current examples of structure-based methods used to identify ligands of orphan GPCRs. Linked Articles This article is part of a themed section on Molecular Pharmacology of G Protein-Coupled Receptors. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v173.20/issuetoc.
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Affiliation(s)
- Tony Ngo
- Molecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Darlinghurst, NSW, Australia
- St. Vincent's Clinical School, University of New South Wales, Darlinghurst, NSW, Australia
| | - Irina Kufareva
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, CA, USA
| | - James Lj Coleman
- Molecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Darlinghurst, NSW, Australia
- St. Vincent's Clinical School, University of New South Wales, Darlinghurst, NSW, Australia
| | - Robert M Graham
- Molecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Darlinghurst, NSW, Australia
- St. Vincent's Clinical School, University of New South Wales, Darlinghurst, NSW, Australia
| | - Ruben Abagyan
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, CA, USA
| | - Nicola J Smith
- Molecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Darlinghurst, NSW, Australia.
- St. Vincent's Clinical School, University of New South Wales, Darlinghurst, NSW, Australia.
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Waszkielewicz AM, Kubacka M, Pańczyk K, Mogilski S, Siwek A, Głuch-Lutwin M, Gryboś A, Filipek B. Synthesis and activity of newly designed aroxyalkyl or aroxyethoxyethyl derivatives of piperazine on the cardiovascular and the central nervous systems. Bioorg Med Chem Lett 2016; 26:5315-5321. [PMID: 27692547 DOI: 10.1016/j.bmcl.2016.09.037] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 09/12/2016] [Accepted: 09/14/2016] [Indexed: 02/08/2023]
Abstract
In the search for new hypotensive agents some new aroxyalkyl or aroxyethoxyethyl derivatives of piperazine have been synthesized and evaluated for their pharmacological properties. Pharmacological tests included receptor binding assays toward adrenergic receptors α1, α2 and β1, additionally 5-HT1A, functional bioassay and in vivo evaluation of hypotensive activity as well as antidepressant-like potential. All the tested compounds exhibited α1-antagonistic properties, three of them possessed also hypotensive activity in rats. The most promising compound 3 1-[4-(2,6-dimethylphenoxy)butyl]-4-(2-methoxyphenyl)piperazine hydrochloride was a selective α1 receptor antagonist (Ki=23.5±1.3, α1/α2=15.77, pKB=8.538±0.109). It was active in all tested doses in vivo (1, 0.5, and 0.1mg/kg) and it reduced blood pressure by 10-13% at the dose of 1mg/kg (rats, i.v.). Compound 5 1-[2-(2,3-dimethylphenoxy)ethoxyethyl]-4-(2-methoxyphenyl)piperazine dihydrochloride exhibited the lowest dose for antidepressant-like activity 5mg/kgb.w. (mice, i.p.) without influence on spontaneous activity (mice, i.p.).
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Affiliation(s)
- Anna Maria Waszkielewicz
- Department of Bioorganic Chemistry, Chair of Organic Chemistry, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland.
| | - Monika Kubacka
- Department of Pharmacodynamics, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland
| | - Katarzyna Pańczyk
- Department of Bioorganic Chemistry, Chair of Organic Chemistry, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland
| | - Szczepan Mogilski
- Department of Pharmacodynamics, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland
| | - Agata Siwek
- Department of Pharmacobiology, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland
| | - Monika Głuch-Lutwin
- Department of Pharmacobiology, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland
| | - Anna Gryboś
- Department of Pharmacobiology, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland
| | - Barbara Filipek
- Department of Pharmacodynamics, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland
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Liégeois JF, Lespagnard M, Meneses Salas E, Mangin F, Scuvée-Moreau J, Dilly S. Enhancing a CH-π Interaction to Increase the Affinity for 5-HT1A Receptors. ACS Med Chem Lett 2014; 5:358-62. [PMID: 24900840 DOI: 10.1021/ml4004843] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Accepted: 01/29/2014] [Indexed: 02/07/2023] Open
Abstract
An electrostatic interaction related to a favorable position of the distal phenyl ring and a phenylalanine residue in the binding pocket would explain the higher 5-HT1A affinity of a 4-phenyl-1,2,3,6-tetrahydropyridine (THP) analogue compared to the corresponding 4-phenylpiperazine analogue. To explore a possible reinforcement of this interaction to increase the affinity for 5-HT1A receptors, different 4-substituted-phenyl analogues were synthesized and tested. The most important increase of affinity is obtained with two electron-donating methyl groups in positions 3 and 5.
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Affiliation(s)
- Jean-François Liégeois
- Laboratory
of Medicinal Chemistry and C.I.R.M., University of Liège, avenue
de l′Hôpital, 1 (B36), B-4000 Liège 1, Belgium
| | - Marc Lespagnard
- Laboratory
of Medicinal Chemistry and C.I.R.M., University of Liège, avenue
de l′Hôpital, 1 (B36), B-4000 Liège 1, Belgium
| | - Elsa Meneses Salas
- Laboratory
of Medicinal Chemistry and C.I.R.M., University of Liège, avenue
de l′Hôpital, 1 (B36), B-4000 Liège 1, Belgium
| | - Floriane Mangin
- Laboratory
of Medicinal Chemistry and C.I.R.M., University of Liège, avenue
de l′Hôpital, 1 (B36), B-4000 Liège 1, Belgium
| | - Jacqueline Scuvée-Moreau
- Laboratory
of Pharmacology and GIGA-Neuroscience, University of Liège, avenue
de l′Hôpital, 1 (B36), B-4000 Liège 1, Belgium
| | - Sébastien Dilly
- Laboratory
of Medicinal Chemistry and C.I.R.M., University of Liège, avenue
de l′Hôpital, 1 (B36), B-4000 Liège 1, Belgium
- Laboratory
of Pharmacology and GIGA-Neuroscience, University of Liège, avenue
de l′Hôpital, 1 (B36), B-4000 Liège 1, Belgium
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A linear combination of pharmacophore hypotheses as a new tool in search of new active compounds--an application for 5-HT1A receptor ligands. PLoS One 2013; 8:e84510. [PMID: 24367669 PMCID: PMC3867515 DOI: 10.1371/journal.pone.0084510] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Accepted: 11/22/2013] [Indexed: 11/19/2022] Open
Abstract
This study explores a new approach to pharmacophore screening involving the use of an optimized linear combination of models instead of a single hypothesis. The implementation and evaluation of the developed methodology are performed for a complete known chemical space of 5-HT1AR ligands (3616 active compounds with Ki < 100 nM) acquired from the ChEMBL database. Clusters generated from three different methods were the basis for the individual pharmacophore hypotheses, which were assembled into optimal combinations to maximize the different coefficients, namely, MCC, accuracy and recall, to measure the screening performance. Various factors that influence filtering efficiency, including clustering methods, the composition of test sets (random, the most diverse and cluster population-dependent) and hit mode (the compound must fit at least one or two models from a final combination) were investigated. This method outmatched both single hypothesis and random linear combination approaches.
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Pharmacological characterization of N1-(2-methoxyphenyl)-N4-hexylpiperazine as a multi-target antagonist of α1A/α1D-adrenoceptors and 5-HT1A receptors that blocks prostate contraction and cell growth. Naunyn Schmiedebergs Arch Pharmacol 2013; 387:225-34. [PMID: 24213881 DOI: 10.1007/s00210-013-0935-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Accepted: 10/21/2013] [Indexed: 10/26/2022]
Abstract
Benign prostatic hyperplasia (BPH) is a progressive disease related to the imbalance of cell growth and apoptosis, and it plays a key role in the development of lower urinary tract symptoms (LUTS). The main pharmacological treatment is based on α1A-adrenoceptor blockers, but in several cases monotherapy has failed. Recent studies of prostate pathophysiology have noted the role of α1D-adrenoceptors and 5-HT1A receptors in prostate cell proliferation in addition to the usual role of α1A-adrenoceptors in prostate contraction. N-phenylpiperazine is a scaffold structure that may confer drug affinity for these three receptors. Therefore, the present work aimed to investigate the pharmacological characteristics of N1-(2-methoxyphenyl)-N4-hexylpiperazine (LDT66). Using isometric contraction assays with rat prostate and aorta, LDT66 reduced phenylephrine-induced contractions and showed K B values of 3.4 and 2.2 nM for α1A- and α1D-adrenoceptors, respectively. According to the functional binding assays data, LDT66 showed a high affinity (nanomolar range) for the 5-HT1A receptors, behaving as an antagonist. LDT66 also showed a low affinity (micromolar range) for receptors unrelated to BPH such as α1B-adrenoceptors, α2A-adrenoceptors, muscarinic and 5-HT2A receptors, which is a desirable profile in order to prevent putative side effects. Accordingly, LDT66 (100 μg/kg) showed a marginal hypotensive effect. Using the DU-145 prostate cells, control experiments characterized the α1D-adrenoceptor- and 5-HT1A receptor-mediated cell growth by phenylephrine and 5-HT, respectively. LDT66 (50 nM) prevented both effects similarly. In conclusion, LDT66 is a high-affinity multi-target antagonist of relevant receptors for BPH, and it may be a new starting point for multi-target drug development to treat BPH and LUTS.
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