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Śliwa P, Kurczab R, Kafel R, Drabczyk A, Jaśkowska J. Recognition of repulsive and attractive regions of selected serotonin receptor binding site using FMO-EDA approach. J Mol Model 2019; 25:114. [PMID: 30955095 DOI: 10.1007/s00894-019-3995-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 03/14/2019] [Indexed: 12/28/2022]
Abstract
The complexes of selected long-chain arylpiperazines with homology models of 5-HT1A, 5-HT2A, and 5-HT7 receptors were investigated using quantum mechanical methods. The molecular geometries of the ligand-receptor complexes were firstly optimized with the Our own N-layered Integrated molecular Orbital and molecular Mechanics (ONIOM) method. Next, the fragment molecular orbitals method with an energy decomposition analysis scheme (FMO-EDA) was employed to estimate the interaction energies in binding sites. The results clearly showed that orthosteric binding sites of studied serotonin receptors have both attractive and repulsive regions. In the case of 5-HT1A and 5-HT2A two repulsive areas, located in the lower part of the binding pocket, and one large area of attraction engaging many residues at the top of all helices were identified. Additionally, for the 5-HT7 receptor, the third area of destabilization located at the extracellular end of the helix 6 was found.
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Affiliation(s)
- Paweł Śliwa
- Faculty of Chemical Engineering and Technology, Cracow University of Technology, 24 Warszawska, 31-155, Kraków, Poland.
| | - Rafał Kurczab
- Department of Medicinal Chemistry, Institute of Pharmacology, Polish Academy of Sciences, 12 Smȩtna, 31-343, Kraków, Poland
| | - Rafał Kafel
- Department of Medicinal Chemistry, Institute of Pharmacology, Polish Academy of Sciences, 12 Smȩtna, 31-343, Kraków, Poland
| | - Anna Drabczyk
- Faculty of Chemical Engineering and Technology, Cracow University of Technology, 24 Warszawska, 31-155, Kraków, Poland
| | - Jolanta Jaśkowska
- Faculty of Chemical Engineering and Technology, Cracow University of Technology, 24 Warszawska, 31-155, Kraków, Poland
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2
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Warszycki D, Rueda M, Mordalski S, Kristiansen K, Satała G, Rataj K, Chilmonczyk Z, Sylte I, Abagyan R, Bojarski AJ. From Homology Models to a Set of Predictive Binding Pockets-a 5-HT 1A Receptor Case Study. J Chem Inf Model 2017; 57:311-321. [PMID: 28055203 PMCID: PMC5361891 DOI: 10.1021/acs.jcim.6b00263] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Despite its remarkable importance in the arena of drug design, serotonin 1A receptor (5-HT1A) has been elusive to the X-ray crystallography community. This lack of direct structural information not only hampers our knowledge regarding the binding modes of many popular ligands (including the endogenous neurotransmitter-serotonin), but also limits the search for more potent compounds. In this paper we shed new light on the 3D pharmacological properties of the 5-HT1A receptor by using a ligand-guided approach (ALiBERO) grounded in the Internal Coordinate Mechanics (ICM) docking platform. Starting from a homology template and set of known actives, the method introduces receptor flexibility via Normal Mode Analysis and Monte Carlo sampling, to generate a subset of pockets that display enriched discrimination of actives from inactives in retrospective docking. Here, we thoroughly investigated the repercussions of using different protein templates and the effect of compound selection on screening performance. Finally, the best resulting protein models were applied prospectively in a large virtual screening campaign, in which two new active compounds were identified that were chemically distinct from those described in the literature.
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Affiliation(s)
- Dawid Warszycki
- Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Kraków, Poland
| | - Manuel Rueda
- University of California, San Diego, Skaggs School of Pharmacy & Pharmaceutical Sciences, 9500 Gilman Drive, MC 0747 La Jolla, CA 92093-0747, U.S
| | - Stefan Mordalski
- Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Kraków, Poland
| | - Kurt Kristiansen
- Department of Medical Biology, Faculty of Health Sciences, University of Tromsø, N-9037 Tromsø, Norway
| | - Grzegorz Satała
- Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Kraków, Poland
| | - Krzysztof Rataj
- Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Kraków, Poland
| | - Zdzisław Chilmonczyk
- Department of Cell Biology, National Medicines Institute, 30/34 Chełmska Street, 00-725 Warszawa, Poland
| | - Ingebrigt Sylte
- Department of Medical Biology, Faculty of Health Sciences, University of Tromsø, N-9037 Tromsø, Norway
| | - Ruben Abagyan
- University of California, San Diego, Skaggs School of Pharmacy & Pharmaceutical Sciences, 9500 Gilman Drive, MC 0747 La Jolla, CA 92093-0747, U.S
| | - Andrzej J. Bojarski
- Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Kraków, Poland
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3
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Szulczyk D, Bielenica A, Dobrowolski MA, Dobrzycki L, Krawiecka M, Kuran B, Struga M. Synthesis and structure evaluation of new complex butylarylpiperazin-1-yl derivatives. Med Chem Res 2014; 23:1519-1536. [PMID: 24489455 PMCID: PMC3905170 DOI: 10.1007/s00044-013-0740-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Accepted: 08/17/2013] [Indexed: 11/30/2022]
Abstract
A series of arylpiperazine derivatives of 1,16-diphenyl-19-azahexacyclo-[14.5.1.02,15.03,8.09,14.017,21]docosa-2,3,5,7,8,9,11,13,14-nonaene-18,20,22-trione and 4,10-diphenyl-1H,2H,3H,5H-indeno[1,2-f]isoindole-1,3,5-trione was synthesized. The pharmacological profile of compound 4 at the 5-HT1A receptor was measured by binding assay. The title compounds were tested in cell-based assay against the human immunodeficiency virus type-1. The X-ray crystallographic studies of derivatives 2, 6, 7, 11, 19, and 20 were presented.
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Affiliation(s)
- Daniel Szulczyk
- Department of Medical Chemistry, Faculty of Medicine, Medical University of Warsaw, Oczki 3 Street, 02-007 Warsaw, Poland
| | - Anna Bielenica
- Department of Medical Chemistry, Faculty of Medicine, Medical University of Warsaw, Oczki 3 Street, 02-007 Warsaw, Poland
| | - Michał A Dobrowolski
- Faculty of Chemistry, University of Warsaw, Pasteura 1 Street, 02-093 Warsaw, Poland
| | - Lukasz Dobrzycki
- Faculty of Chemistry, University of Warsaw, Pasteura 1 Street, 02-093 Warsaw, Poland
| | - Mariola Krawiecka
- Department of Medical Chemistry, Faculty of Medicine, Medical University of Warsaw, Oczki 3 Street, 02-007 Warsaw, Poland
| | - Bożena Kuran
- Department of Medical Chemistry, Faculty of Medicine, Medical University of Warsaw, Oczki 3 Street, 02-007 Warsaw, Poland
| | - Marta Struga
- Department of Medical Chemistry, Faculty of Medicine, Medical University of Warsaw, Oczki 3 Street, 02-007 Warsaw, Poland
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4
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Fanelli F, De Benedetti PG. Update 1 of: computational modeling approaches to structure-function analysis of G protein-coupled receptors. Chem Rev 2011; 111:PR438-535. [PMID: 22165845 DOI: 10.1021/cr100437t] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Francesca Fanelli
- Dulbecco Telethon Institute, University of Modena and Reggio Emilia, via Campi 183, 41125 Modena, Italy.
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6
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El-Kerdawy MM, El-Bendary ER, Abdel-Aziz AAM, El-wasseef DR, El-Aziz NIA. Synthesis and pharmacological evaluation of novel fused thiophene derivatives as 5-HT2A receptor antagonists: Molecular modeling study. Eur J Med Chem 2010; 45:1805-20. [DOI: 10.1016/j.ejmech.2010.01.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2008] [Revised: 01/06/2010] [Accepted: 01/09/2010] [Indexed: 11/28/2022]
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7
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Makan SY, Tsymbal DI, Soboleva SG, Tarabara IN, Kas’yan LI, Andronati SA. N-[4-(arylpiperazin-1-yl)butyl]bicyclo[2.2.1]hept-5-ene-endo-2,endo-3-dicarboximides and Their Epoxy Derivatives. Synthesis and affinity for 5-HT1a receptors. RUSS J GEN CHEM+ 2009. [DOI: 10.1134/s1070363209020212] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Jarończyk M, Chilmonczyk Z, Mazurek AP, Nowak G, Ravna AW, Kristiansen K, Sylte I. The molecular interactions of buspirone analogues with the serotonin transporter. Bioorg Med Chem 2008; 16:9283-94. [PMID: 18812261 DOI: 10.1016/j.bmc.2008.09.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2008] [Revised: 08/26/2008] [Accepted: 09/02/2008] [Indexed: 11/18/2022]
Abstract
A major problem with the selective serotonin reuptake inhibitors (SSRIs) is the delayed onset of action. A reason for that may be that the initial SSRI-induced increase in serotonin levels activates somatodendritic 5-HT(1A) autoreceptors, causing a decrease in serotonin release in major forebrain areas. It has been suggested that compounds combining inhibition of the serotonin transport protein with antagonistic effects on the 5-HT(1A) receptor will shorten the onset time. The anxiolytic drug buspirone is known as 5-HT(1A) partial agonist. In the present work, we are studying the inhibition of the serotonin transporter protein by a series of buspirone analogues by molecular modelling and by experimental affinity measurements. Models of the transporter protein were constructed using the crystal structure of the Escherichia coli major facilitator family transporter-LacY and the X-ray structure of the neurotransmitter symporter family (NSS) transporter-LeuT(Aa) as templates. The buspirone analogues were docked into both SERT models and the interactions with amino acids within the protein were analyzed. Two putative binding sites were identified on the LeuT(Aa) based model, one suggested to be a high-affinity site, and the other suggested to be a low-affinity binding site. Molecular dynamic simulations of the LacY based model in complex with ligands did not induce a helical architecture of the LacY based model into an arrangement more similar to that of the LeuT(Aa) based model.
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10
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Kim HJ, Doddareddy MR, Choo H, Cho YS, No KT, Park WK, Pae AN. New serotonin 5-HT(6) ligands from common feature pharmacophore hypotheses. J Chem Inf Model 2007; 48:197-206. [PMID: 18044950 DOI: 10.1021/ci700160t] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Serotonin 5-HT6 receptor antagonists are thought to play an important role in the treatment of psychiatry, Alzheimer's disease, and probably obesity. To find novel and potent 5-HT6 antagonists and to provide a new idea for drug design, we used a ligand-based pharmacophore to perform the virtual screening of a commercially available database. A three-dimensional common feature pharmacophore model was developed by using the HipHop program provided in Catalyst software and was used as a query for screening the database. A recursive partitioning (RP) model which can separate active and inactive compounds was used as a filtering system. Finally a sequential virtual screening procedure (SQSP) was conducted, wherein both the common feature pharmacophore and the RP model were used in succession to improve the results. Some of the hits were selected based on druglikeness, ADME properties, structural diversity, and synthetic accessibility for real biological evaluation. The best hit compound showed a significant IC50 value of 9.6 nM and can be used as a lead for further drug development.
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Affiliation(s)
- Hye-Jung Kim
- Life Science Division, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, South Korea
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11
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Nowak M, Kołaczkowski M, Pawłowski M, Bojarski AJ. Homology modeling of the serotonin 5-HT1A receptor using automated docking of bioactive compounds with defined geometry. J Med Chem 2006; 49:205-14. [PMID: 16392805 DOI: 10.1021/jm050826h] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This paper describes a rhodopsin-based model of 5-HT(1A) serotonin receptor. The flexibility of the receptor was considered by using large number of models for ligand dockings. Rearrangements of the heptahelical bundle were introduced, which resulted in the improvement of correlation between computational results and experimental data. The model was validated by automated docking of conformationally restricted arylpiperazines. Specific interactions, responsible for the recognition of arylpiperazine derivatives, were identified. An ionic bond was formed between the protonated amine of ligands and Asp3.32. The aromatic moiety and its substituents specifically interacted with Phe6.52 and Ser5.42, respectively, while the carbonyl groups of imide part of ligands formed hydrogen bonds with Asn7.39 and Tyr7.43. The model reproduced the binding affinity of the test group of ligands (correlation r = 0.8 between pK(i) and docking score). It also gave the enrichment in virtual screening-like experiment (100 compounds), in which 34 high-affinity compounds were found among 50 top-scored ligands.
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Affiliation(s)
- Mateusz Nowak
- Department of Medicinal Chemistry, Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Kraków, Poland.
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12
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Fanelli F, De Benedetti PG. Computational Modeling Approaches to Structure−Function Analysis of G Protein-Coupled Receptors. Chem Rev 2005; 105:3297-351. [PMID: 16159154 DOI: 10.1021/cr000095n] [Citation(s) in RCA: 129] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Francesca Fanelli
- Dulbecco Telethon Institute and Department of Chemistry, University of Modena and Reggio Emilia, via Campi 183, 41100 Modena, Italy.
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13
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Fiorino F, Perissutti E, Severino B, Santagada V, Cirillo D, Terracciano S, Massarelli P, Bruni G, Collavoli E, Renner C, Caliendo G. New 5-Hydroxytryptamine1A Receptor Ligands Containing a Norbornene Nucleus: Synthesis and in Vitro Pharmacological Evaluation. J Med Chem 2005; 48:5495-503. [PMID: 16107148 DOI: 10.1021/jm050246k] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
New arylpiperazine derivatives were prepared to identify highly selective and potent ligands for the 5-hydroxytryptamine 1A (5-HT(1A)) receptor as potential pharmacological tools in studies of central nervous system (CNS) disorders. The combination of structural elements (heterocyclic nucleus, oxyalkyl chain, and arylpiperazine) known to introduce 5-HT(1A) receptor affinity and the proper selection of substituents led to compounds with higher receptor specificity and affinity. In binding studies, several molecules showed affinity in the nanomolar and subnanomolar ranges at 5-HT(1A) and moderate to no affinity for other relevant receptors (5-HT(2A), 5-HT(2C), D(1), D(2), alpha(1), and alpha(2)). The 4-[3-[4-(o-methoxyphenyl)piperazin-1-yl]propoxy]-4-aza-tricyclo[5.2.1.02,6]dec-8-ene-3,5-dione, with K(i) = 0.021 nM, was the most active and selective derivative for the 5-HT(1A) receptor with respect to other serotonin receptors, whereas the most selective derivative for dopaminergic and adrenergic receptors was a CF(3)-substituted arylpiperazine. As a general trend, compounds with a piperazinylpropoxy chain showed a preferential affinity for the 5-HT(1A) receptor, suggesting that the alkyl chain length represents a critical structural feature in determining 5-HT(1A) receptor affinity and selectivity, as confirmed by the molecular modeling invoked for explaining the differential binding affinities of the new arylpiperazines.
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MESH Headings
- Animals
- Binding Sites
- Brain/metabolism
- Heterocyclic Compounds, 3-Ring/chemical synthesis
- Heterocyclic Compounds, 3-Ring/chemistry
- Heterocyclic Compounds, 3-Ring/pharmacology
- In Vitro Techniques
- Male
- Models, Molecular
- Norbornanes/chemical synthesis
- Norbornanes/chemistry
- Norbornanes/pharmacology
- Piperazines/chemical synthesis
- Piperazines/chemistry
- Piperazines/pharmacology
- Radioligand Assay
- Rats
- Rats, Sprague-Dawley
- Receptor, Serotonin, 5-HT1A/chemistry
- Receptor, Serotonin, 5-HT1A/metabolism
- Receptor, Serotonin, 5-HT2A/metabolism
- Receptor, Serotonin, 5-HT2C/metabolism
- Receptors, Adrenergic, alpha-1/metabolism
- Receptors, Adrenergic, alpha-2/metabolism
- Receptors, Dopamine D1/metabolism
- Receptors, Dopamine D2/metabolism
- Structure-Activity Relationship
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Affiliation(s)
- Ferdinando Fiorino
- Dipartimento di Chimica Farmaceutica e Tossicologica, Università di Napoli "Federico II", Via D. Montesano 49, 80131 Napoli, Italy
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14
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Strzelczyk AA, Jarończyk M, Chilmonczyk Z, Mazurek AP, Chojnacka-Wójcik E, Sylte I. Intrinsic activity and comparative molecular dynamics of buspirone analogues at the 5-HT1A receptors. Biochem Pharmacol 2004; 67:2219-30. [PMID: 15163553 DOI: 10.1016/j.bcp.2004.02.026] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2003] [Accepted: 02/13/2004] [Indexed: 11/19/2022]
Abstract
In CNS, the 5-hydroxytryptamine(1A) (5-HT(1A)) receptors exist in two different populations with different behavioural and physiological effects: (1) somatodendritic autoreceptors located pre-synaptically of 5-HT containing neurons and (2) receptors located post-synaptic to 5-HT containing neurons. Clinical studies have shown that 5-HT(1A) partial agonists have anxiolytic properties, while antagonists of pre-synaptical autoreceptors shorten the onset time of selective serotonin reuptake inhibitors (SSRIs). In the present study, the pre- and post-synaptic activity of structural analogues of buspirone was evaluated in animal models. A three dimensional model of the 5-HT(1A) receptor was used to study their interaction modes and helical displacements upon receptor binding. The predicted receptor-ligand interactions indicated similarities in the receptor binding modes for all buspirone analogues, and no clear relationship between receptor contact residues and activity at pre- and post-synaptic receptors. Comparative molecular dynamics (MD) simulations for 650ps indicated that pre-synaptic antagonistic behaviour is connected to large displacements of transmembrane helix (TMH) 7 upon binding, while pre-synaptic agonistic behaviour is connected to large displacements of TMH2 and small displacements of TMH7. Post-synaptic partial agonist behaviour is connected to large displacements of TMH4 and TMH5 upon binding, while post-synaptic antagonists only slightly displace these helices.
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Abstract
Fifteen years ago, a role for excitotoxic damage in the pathology of amyotrophic lateral sclerosis (ALS) was postulated. This stimulated the development of riluzole, the only available treatment for the disease. Since then, the identification of abnormal forms of superoxide dismutase as the genetic basis of certain familial forms of ALS has provided a huge impetus to the search for new effective treatments for this devastating disease. Transgenic mouse models have been developed expressing these aberrant mutants that develop a form of motor neurone disease the progress of which can be slowed by riluzole. Studies in these mice have provided evidence for a role for excitotoxic, apoptotic and oxidative processes in the development of pathology. The mice can be used for testing molecules targeting these processes as potential therapies, to allow the most promising to be evaluated in humans. Several such agents are currently in clinical trials. Many previous clinical trials in ALS were insufficiently powered to demonstrate any relevant effect on disease progression. This situation has been to some extent remedied in the more recent trials, which have recruited many hundreds of patients. However, with the exception of studies with riluzole, the results of these have been disappointing. In particular, a number of large trials with neurotrophic agents have revealed no evidence for efficacy. Nonetheless, the need for large multinational trials of long duration limits the number that can be carried out and makes important demands on investment. For this reason, surrogate markers that can be used for rapid screening in patients of potential treatments identified in the transgenic mice are urgently needed.
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Orús L, Pérez-Silanes S, Oficialdegui AM, Martínez-Esparza J, Del Castillo JC, Mourelle M, Langer T, Guccione S, Donzella G, Krovat EM, Poptodorov K, Lasheras B, Ballaz S, Hervías I, Tordera R, Del Río J, Monge A. Synthesis and molecular modeling of new 1-aryl-3-[4-arylpiperazin-1-yl]-1-propane derivatives with high affinity at the serotonin transporter and at 5-HT(1A) receptors. J Med Chem 2002; 45:4128-39. [PMID: 12213056 DOI: 10.1021/jm0111200] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
It has been proposed that 5-HT(1A) receptor antagonists augment the antidepressant efficacy of selective serotonin (5-HT) reuptake inhibitors. In a search toward new and efficient antidepressants, 1-(aryl)-3-[4-arylpiperazin-1-yl]-1-propane molecular hybrids were designed, synthesized, and evaluated for 5-HT reuptake inhibition and 5-HT(1A) receptor affinity. The design was based in coupling structural moieties related to inhibition of serotonin reuptake, such as benzo[b]thiophene derivatives to arylpiperazines, typical 5-HT(1A) receptor ligands. In binding studies, several compounds showed affinity at the 5-HT transporter and at 5-HT(1A) receptors. Molecular modeling studies predicted the pharmacophore elements required for high affinity binding and the features that enable to discriminate between agonist, partial agonist, or antagonist action at 5-HT(1A) receptors and 5-HT transporter inhibition. Solvent interactions in desolvation prior to the binding step along with enthalpy and enthropy compensations might be responsible to explain agonist, partial agonist, and antagonist character. Hydrogen-bonding capability seems to be important to break hydrogen interhelical hydrogen bonds or alternatively to form other bonds upon ligand binding. Partial agonists and antagonists are unable to do this as the full agonist, which interacts closely by long-range forces or directly. The compounds showing the higher affinity at both the 5-HT transporter (K(i) < 50 nM) and the 5-HT(1A) receptors (K(i) < 20 nM) were further explored for their ability to stimulate [(35)S]GTPgammaS binding or to antagonize 8-hydroxy-2-di-n-propylamino-tetralin (8-OH-DPAT)-stimulated [(35)]GTPgammaS binding to rat hippocampal membranes, an index of agonist/antagonist action at 5-HT(1A) receptors, respectively. Compound 8g exhibited agonist activity (EC(50) = 30 nM) in this assay, whereas compounds 7g and 8h,i behaved as weak partial agonists and 7h-j and 8j,l antagonized the R(+)-8-OH-DPAT-stimulated GTPgammaS binding. Functional characterization was performed by measuring the antagonism to 8-OH-DPAT-induced hypothermia in mice.
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Affiliation(s)
- Lara Orús
- Department of Medicinal Chemistry, Centro de Investigación en Farmacobiología Aplicada (CIFA), Universidad de Navarra, C/ Irunlarrea s/n, 31080 Pamplona, Spain
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17
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Chilmonczyk Z, Cybulski M, Iskra-Jopa J, Chojnacka-Wójcik E, Tatarczyńska E, Kłodzińska A, Leś A, Bronowska A, Sylte I. Interaction of 1,2,4-substituted piperazines, new serotonin receptor ligands, with 5-HT1A and 5-HT2A receptors. FARMACO (SOCIETA CHIMICA ITALIANA : 1989) 2002; 57:285-301. [PMID: 11989808 DOI: 10.1016/s0014-827x(02)01205-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
In the present paper, we describe affinities to 5-HT1A and 5-HT2A receptors of several new 1,2,4-trisubstituted piperazine derivatives. The affinities were compared with those described earlier for 1,4-disubstituted piperazines and the influence of the third (methyl) substituent on the affinity to both receptors is discussed. The difference between two- and three-substituted derivatives was rationalised in terms of molecular modelling of the respective ligand-receptor complexes. Additionally, the functional activity of some 1,2,4-trisubstituted piperazines for 5-HT1A receptor was examined in behavioural and biochemical models. The obtained results have shown that some trisubstituted compounds exhibited a higher affinity to 5-HT2A receptors than their respective disubstituted analogues (with the affinity to 5-HT1A receptors remaining the same or somewhat improving). The molecular dynamics simulations suggested that the presence of the third substituent in the piperazine ring of those compounds may induce stabilising effect on the ligand-receptor complexes. The results of the in vivo studies have shown that some of the examined trisubstituted piperazines (10-13, 16, 17) exhibited properties of postsynaptic 5-HT1A partial agonists. Moreover, compounds 13 and 16 exhibited features of 5-HT1A presynaptic agonists in in vitro test, and compound 16 also in in vivo tests.
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18
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Bronowska A, Chilmonczyk Z, Leś A, Edvardsen O, Ostensen R, Sylte I. Molecular dynamics of 5-HT1A and 5-HT2A serotonin receptors with methylated buspirone analogues. J Comput Aided Mol Des 2001; 15:1005-23. [PMID: 11989622 DOI: 10.1023/a:1014856107486] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
In the present study experimentally determined ligand selectivity of three methylated buspirone analogues (denoted as MM2, MM5 and P55) towards 5-HT1A and 5-HT2A serotonin receptors was theoretically investigated on a molecular level. The relationships between the ligand structure and 5-HT1A and 5-HT2A receptor affinities were studied and the results were found to be in agreement with the available site-directed mutagenesis and binding affinity data. Molecular dynamics (MD) simulations of ligand-receptor complexes were performed for each investigated analogue, docked twice into the central cavity of 5-HT1A/5-HT2A, each time in a different orientation. Present results were compared with our previous theoretical results, obtained for buspirone and its non-methylated analogues. It was found that due to the presence of the methyl group in the piperazine ring the ligand position alters and the structure of the ligand-receptor complex is modified. Further, the positions of derivatives with pyrimidinyl aromatic moiety and quinolinyl moiety are significantly different at the 5-HT2A receptor. Thus, methylation of such derivatives alters the 3D structures of ligand-receptor complexes in different ways. The ligand-induced changes of the receptor structures were also analysed. The obtained results suggest, that helical domains of both receptors have different dynamical behaviour. Moreover, both location and topography of putative binding sites for buspirone analogues are different at 5-HT1A and 5-HT2A receptors.
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Affiliation(s)
- A Bronowska
- Department of Chemistry, University of Warsaw, Poland.
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