1
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Jha P, Chaturvedi S, Bhat R, Jain N, Mishra AK. Insights of ligand binding in modeled h5-HT 1A receptor: homology modeling, docking, MM-GBSA, screening and molecular dynamics. J Biomol Struct Dyn 2022; 40:11625-11637. [PMID: 34387135 DOI: 10.1080/07391102.2021.1961865] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The pharmacologically characterized receptor subtype of the serotonin family, the 5HT1A receptor is implicated in the pathophysiology and treatment of depression and anxiety-related disorders. Being the most extensively targeted receptor for developing novel antidepressants and anxiolytics, a near-ideal theoretical model can aid in high-throughput screening of promising drug candidates. However, the design of potential drug candidates suffers owing to a lack of complete structural information. In this work, homology models of 5-HT1A receptor are generated using two distinct alignments (CW and PSTA) and model building methods (KB and EB). The developed models are validated for virtual screening using a ligand dataset of agonists and antagonists. The best-suited model was efficient in discriminating agonist/antagonist binding. Correlation plots between pKi and docking (R2agonist≥ 0.6, R2antagonist≥ 0.7) and MM-GBSA dG bind values (R2agonist≥ 0.5, R2antagonist≥ 0.7) revealed optimum corroboration between in vitro and in silico outcomes, which further suggested the usefulness of the developed model for the design of high-affinity probes for the neurological disorders.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Preeti Jha
- Department of Immunology, Genetics and Pathology, Medical Radiation Science, Rudbeck Laboratory, Uppsala, Sweden.,Division of Cyclotron and Radiopharmaceutical Sciences, Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, Delhi, India.,Department of Chemistry, Indian Institute of Technology Delhi, New Delhi, India
| | - Shubhra Chaturvedi
- Division of Cyclotron and Radiopharmaceutical Sciences, Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, Delhi, India
| | - Ruchika Bhat
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi, India.,SCFBio, Indian Institute of Technology Delhi, New Delhi, India
| | - Nidhi Jain
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi, India
| | - Anil K Mishra
- Division of Cyclotron and Radiopharmaceutical Sciences, Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organization, Delhi, India
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2
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Karki A, Namballa HK, Alberts I, Harding WW. Structural manipulation of aporphines via C10 nitrogenation leads to the identification of new 5-HT 7AR ligands. Bioorg Med Chem 2020; 28:115578. [PMID: 32631561 DOI: 10.1016/j.bmc.2020.115578] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 05/26/2020] [Accepted: 05/28/2020] [Indexed: 11/16/2022]
Abstract
Aporphine alkaloids containing a C10 nitrogen motif were synthesized and evaluated for affinity at 5-HT1AR, 5-HT2AR, 5-HT6R and 5-HT7AR. Three series of racemic aporphines were investigated: 1,2,10-trisubstituted, C10 N-monosubstituted and compounds containing a C10 benzofused aminothiazole moiety. The 1,2,10-trisubstituted series of compounds as a group displayed modest selectivity for 5-HT7AR and also had moderate 5-HT7AR affinity. Compounds from the C10 N-monosubstituted series generally lacked affinity for 5-HT2AR and 5-HT6R and showed strong affinity for 5-HT1A or 5-HT7AR. Compounds in this series that contained an N6-methyl group were up to 27-fold selective for 5-HT7AR over 5-HT1AR, whereas compounds with an N6-propyl substituent showed a reversal in this selectivity. The C10 benzofused aminothiazole analogues showed a similar binding profile as the C10 N-monosubstituted series i.e. strong affinity for 5-HT1AR or 5-HT7AR, with selectivity between the two receptors being similarly influenced by N6-methyl or N6-propyl substituents. Compounds 29 and 34a exhibit high 5-HT7AR affinity, excellent selectivity versus dopamine receptors and function as antagonists in 5-HT7AR cAMP-based assays. Compounds 29 and 34a have been identified as new lead molecules for further tool and pharmaceutical optimization.
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Affiliation(s)
- Anupam Karki
- Department of Chemistry, Hunter College, City University of New York, 695 Park Avenue, NY 10065, USA; Program in Biochemistry, CUNY Graduate Center, 365 5(th) Avenue, New York, NY 10016, USA
| | - Hari K Namballa
- Department of Chemistry, Hunter College, City University of New York, 695 Park Avenue, NY 10065, USA
| | - Ian Alberts
- LaGuardia Community College, Department of Chemistry, 31-10 Thompson Avenue, LIC, NY 11104, USA
| | - Wayne W Harding
- Department of Chemistry, Hunter College, City University of New York, 695 Park Avenue, NY 10065, USA; Program in Biochemistry, CUNY Graduate Center, 365 5(th) Avenue, New York, NY 10016, USA; Program in Chemistry, CUNY Graduate Center, 365 5(th) Avenue, New York, NY 10016, USA.
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3
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Jia Q, Cui X, Li L, Wang Q, Liu Y, Xia S, Ma P. Quantitative Structure-Activity Relationship for High Affinity 5-HT1A Receptor Ligands Based on Norm Indexes. J Phys Chem B 2015; 119:15561-7. [PMID: 26605982 DOI: 10.1021/acs.jpcb.5b08980] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Arylpiperazine derivatives are promising 5-hydroxytryptamine (5-HT) receptor ligands which can inhibit serotonin reuptake effectively. In this work, some norm index descriptors were proposed and further utilized to develop a model for predicting 5-HT1A receptor affinity (pKi) of 88 arylpiperazine derivatives. Results showed that this new model could provide satisfactory predictions with the square of the correction coefficient (R(2)) of 0.8891 and the squared correlation coefficient of cross-validation (Q(2)) of 0.8082, respectively. In addition, the applicability domain of this model was validated by using the leverage approach and results which suggested potential large scale for further utilization of this model. The results of statistical values and validation tests demonstrated that our proposed norm index based model could be successfully applied for predicting the affinity 5-HT1A receptor ligands of arylpiperazine derivatives.
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Affiliation(s)
| | | | | | | | | | - Shuqian Xia
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, People's Republic of China
| | - Peisheng Ma
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, People's Republic of China
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4
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Ponnala S, Gonzales J, Kapadia N, Navarro HA, Harding WW. Evaluation of structural effects on 5-HT(2A) receptor antagonism by aporphines: identification of a new aporphine with 5-HT(2A) antagonist activity. Bioorg Med Chem Lett 2014; 24:1664-7. [PMID: 24630561 PMCID: PMC4022183 DOI: 10.1016/j.bmcl.2014.02.066] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Revised: 02/19/2014] [Accepted: 02/24/2014] [Indexed: 01/22/2023]
Abstract
A set of aporphine analogs related to nantenine was evaluated for antagonist activity at 5-HT2A and α1A adrenergic receptors. With regards to 5-HT2A receptor antagonism, a C2 allyl group is detrimental to activity. The chiral center of nantenine is not important for 5-HT2A antagonist activity, however the N6 nitrogen atom is a critical feature for 5-HT2A antagonism. Compound 12b was the most potent 5-HT2A aporphine antagonist identified in this study and has similar potency to previously identified aporphine antagonists 2 and 3. The ring A and N6 modifications examined were detrimental to α1A antagonism. A slight eutomeric preference for the R enantiomer of nantenine was observed in relation to α1A antagonism.
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Affiliation(s)
| | - Junior Gonzales
- Chemistry Dept., Hunter College, CUNY, 695 Park Avenue, NY 10065, USA; The Graduate Center, City University of New York, 365 5th Ave., NY 10016, USA
| | - Nirav Kapadia
- Chemistry Dept., Hunter College, CUNY, 695 Park Avenue, NY 10065, USA; The Graduate Center, City University of New York, 365 5th Ave., NY 10016, USA
| | - Hernan A Navarro
- Center for Organic and Medicinal Chemistry, Research Triangle Institute, Research Triangle Park, NC 27709, USA
| | - Wayne W Harding
- Chemistry Dept., Hunter College, CUNY, 695 Park Avenue, NY 10065, USA; The Graduate Center, City University of New York, 365 5th Ave., NY 10016, USA.
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5
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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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Zhang H, Ye N, Zhou S, Guo L, Zheng L, Liu Z, Gao B, Zhen X, Zhang A. Identification of N-Propylnoraporphin-11-yl 5-(1,2-Dithiolan-3-yl)pentanoate as a New Anti-Parkinson's Agent Possessing a Dopamine D2 and Serotonin 5-HT1A Dual-Agonist Profile. J Med Chem 2011; 54:4324-38. [DOI: 10.1021/jm200347t] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hai Zhang
- Department of Pharmacology, Soochow University College of Pharmaceutical Sciences, Suzhou, China 215325
| | | | | | | | - Longtai Zheng
- Department of Pharmacology, Soochow University College of Pharmaceutical Sciences, Suzhou, China 215325
| | | | - Bo Gao
- Department of Pharmacology, Soochow University College of Pharmaceutical Sciences, Suzhou, China 215325
| | - Xuechu Zhen
- Department of Pharmacology, Soochow University College of Pharmaceutical Sciences, Suzhou, China 215325
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7
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Liu Z, Zhang H, Ye N, Zhang J, Wu Q, Sun P, Li L, Zhen X, Zhang A. Synthesis of dihydrofuroaporphine derivatives: identification of a potent and selective serotonin 5-HT 1A receptor agonist. J Med Chem 2010; 53:1319-28. [PMID: 20041669 DOI: 10.1021/jm9015763] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A series of new aporphine analogues were synthesized and pharmacologically evaluated. 11-Allyloxy-(17), 11-propargyloxy-(20), and dihydrofuro-(19) aporphines displayed the highest affinity at the 5-HT(1A) receptor with K(i) values of 12.0, 14.0, and 6.7 nM, respectively. The high binding potential of the diastereomeric mixture of aporphine 19 was found residing in the cis-diastereomer (cis-19). [(35)S]GTP gamma S function assays on 5-HT(1A) receptor indicated that aporphines 17 and 20 were partial agonists, while trans-19 behaved as a high efficacy full antagonist and cis-19 was a full agonist. The agonistic property of cis-19 at the 5-HT(1A) receptor was further confirmed in vitro and in vivo. This compound may be useful as a potential treatment for anxiety.
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Affiliation(s)
- Zhili Liu
- Synthetic Organic & Medicinal Chemistry Laboratory (SOMCL), Shanghai Institute of Materia Medica (SIMM), Chinese Academy of Sciences, Shanghai, China
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8
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Dilly S, Graulich A, Liégeois JF. Molecular modeling study of 4-phenylpiperazine and 4-phenyl-1,2,3,6-tetrahydropyridine derivatives: A new step towards the design of high-affinity 5-HT1A ligands. Bioorg Med Chem Lett 2010; 20:1118-23. [DOI: 10.1016/j.bmcl.2009.12.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2009] [Revised: 11/28/2009] [Accepted: 12/04/2009] [Indexed: 10/20/2022]
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9
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Liu Z, Chen X, Sun P, Yu L, Zhen X, Zhang A. N-Propylnoraporphin-11-O-yl carboxylic esters as potent dopamine D2 and serotonin 5-HT1A receptor dual ligands. Bioorg Med Chem 2008; 16:8335-8. [DOI: 10.1016/j.bmc.2008.08.056] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2008] [Revised: 08/22/2008] [Accepted: 08/23/2008] [Indexed: 10/21/2022]
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10
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Liu Z, Chen X, Yu L, Zhen X, Zhang A. Synthesis and pharmacological investigation of novel 2-aminothiazole-privileged aporphines. Bioorg Med Chem 2008; 16:6675-81. [DOI: 10.1016/j.bmc.2008.05.077] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2008] [Revised: 05/29/2008] [Accepted: 05/30/2008] [Indexed: 11/15/2022]
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11
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Sipos A, Berényi S. Benzylation of morphinandienes and new aspects of their acid-catalyzed rearrangement to new aporphines. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.04.069] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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12
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Zefirova ON, Zefirov NS. Physiologically active compounds interacting with serotonin (5-hydroxytryptamine) receptors. RUSSIAN CHEMICAL REVIEWS 2007. [DOI: 10.1070/rc2001v070n04abeh000654] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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13
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Sipos A, Debreceni S, Szabó R, Gyulai Z, Berényi S. Synthesis of 3‐Alkyl and Arylapomorphines. SYNTHETIC COMMUN 2007. [DOI: 10.1080/00397910701462773] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Si YG, Gardner MP, Tarazi FI, Baldessarini RJ, Neumeyer JL. R-(−)-N-alkyl-11-hydroxy-10-hydroxymethyl- and 10-methyl-aporphines as 5-HT1A receptor ligands. Bioorg Med Chem Lett 2007; 17:4128-30. [PMID: 17543523 DOI: 10.1016/j.bmcl.2007.05.057] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2007] [Revised: 05/16/2007] [Accepted: 05/17/2007] [Indexed: 11/19/2022]
Abstract
Several N-substituted-11-hydroxy-10-hydroxymethyl- and 11-hydroxy-10-methylaporphines were synthesized and their binding affinities at dopamine D(1) and D(2) receptors and serotonin 5-HT(1A) and 5-HT(2A) receptors in rat forebrain tissue were evaluated. Tested compounds displayed moderate to high affinity to 5-HT(1A) receptors but low affinity to D(1) and D(2) receptors. The most potent novel 5-HT(1A) agent was R-(-)-N-methyl-10-hydroxymethyl-11-hydroxyaporphine.
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Affiliation(s)
- Yu-Gui Si
- Alcohol Drug Abuse Research Center, McLean Hospital, Harvard Medical School, 115 Mill Street, Belmont, MA 02478, USA
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15
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Søndergaard K, Langgaard Kristensen J, Gillings N, Begtrup M. Synthesis of (R)-(-)-2-Fluoronorapomorphine — A Precursor for the Synthesis of (R)-(-)-2-Fluoro-N-[11C]propylnorapomorphine for Evaluation as a Dopamine D2 Agonist Ligand for PET Investigations. European J Org Chem 2005. [DOI: 10.1002/ejoc.200500295] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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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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17
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Bänziger M, Cercus J, Hirt H, Laumen K, Malan C, Spindler F, Struber F, Troxler T. The development of a practical synthesis of the potent and selective somatostatin sst3 receptor antagonist [4-(3,4-difluoro-phenyl)-piperazine-1-yl]-{(4S,4aS,8aR)-2[(S)-3-(6-methoxy-pyridin-3-yl)-2-methyl-propyl]-decahydroisoquinoline-4-yl}-methanone (NVP-ACQ090). ACTA ACUST UNITED AC 2003. [DOI: 10.1016/j.tetasy.2003.07.024] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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18
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Paluchowska MH, Bojarski AJ, Charakchieva-Minol S, Wesołowska A. Active conformation of some arylpiperazine postsynaptic 5-HT(1A) receptor antagonists. Eur J Med Chem 2002; 37:273-83. [PMID: 11960662 DOI: 10.1016/s0223-5234(01)01312-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The synthesis and pharmacological properties of novel conformationally restricted arylpiperazine (2b-4b) or 1,2,3,4-tetrahydroisoquinoline (5b and 6b) derivatives of the known, flexible 5-HT(1A) receptor ligands 2a-6a (K(i)=0.95-7 nM) with different intrinsic activities are reported. Replacement of a tetramethylene chain with a 1e,4e-disubstituted cyclohexane ring in the structure of flexible ligands resulted in insignificant diminution of the 5-HT(1A) receptor affinity in the case of 2b-4b (K(i)=15-52 nM), whereas derivatives 5b and 6b were practically inactive (K(i)>1354 nM). The results of in vivo behavioural tests showed that 2a and 3a acted as postsynaptic 5-HT(1A) receptor partial agonists. Like the flexible 4a, the new rigid compounds 2b-4b showed features of postsynaptic 5-HT(1A) receptor antagonists. Since all possible conformations of the constrained compounds belong to an extended family--as indicated by molecular modelling studies--our hypothesis that such conformations are responsible for the blockade of postsynaptic 5-HT(1A) receptors has been confirmed. Determination of regions explored by terminal amide, or imide and hydrocarbon groups of the restricted compounds as well as the results of in vitro and in vivo studies allowed us to discuss the bioactive conformations of flexible ligands.
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Affiliation(s)
- Maria Halina Paluchowska
- Department of Medicinal Chemistry, Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Kraków, Poland.
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19
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Garrido JMPJ, Delerue-Matos C, Borges MFM, Macedo TRA, Oliveira-Brett AM. Oxidative behaviour of apomorphine and its metabolites. Bioelectrochemistry 2002; 55:113-4. [PMID: 11786353 DOI: 10.1016/s1567-5394(01)00169-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The metabolism of apomorphine is quite complex due to interactions with proteins and other tissue components that affect its pharmacokinetic profile. The electrochemical oxidation mechanism of apomorphine and of some synthesised apomorphine derivatives was studied. It was found to be related to the reaction of o-diphenol and tertiary amine groups and strongly dependent on pH.
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Affiliation(s)
- J M P J Garrido
- CEQUP/Dep. Eng. Química, Instituto Superior de Engenharia do Porto, Rua S. Tomé, 4200-485 Porto, Portugal
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20
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Linnanen T, Brisander M, Mohell N, Johansson AM. Serotonergic and dopaminergic activities of rigidified (R)-aporphine derivatives. Bioorg Med Chem Lett 2001; 11:367-70. [PMID: 11212112 DOI: 10.1016/s0960-894x(00)00655-7] [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
Novel rigidified (R)-aporphine derivatives were synthesized from (R)-1,11-carbonylaporphine by ring expansion reactions. The structures of the novel analogues were assigned by NMR spectroscopy and X-ray crystallography. The compounds showed moderate affinities and selectivities at serotonin S-HT1A and 5-HT7 and dopamine D2A receptors.
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Affiliation(s)
- T Linnanen
- Organic Pharmaceutical Chemistry, Uppsala University, Uppsala Biomedical Center, Sweden
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21
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Homan EJ, Wikström HV, Grol CJ. Molecular modeling of the dopamine D2 and serotonin 5-HT1A receptor binding modes of the enantiomers of 5-OMe-BPAT. Bioorg Med Chem 1999; 7:1805-20. [PMID: 10530928 DOI: 10.1016/s0968-0896(99)00134-0] [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: 11/18/2022]
Abstract
Molecular modeling studies were undertaken in order to elucidate the possible dopamine D2 and serotonin 5-HT1A receptor binding modes of the enantiomers of 5-methoxy-2-[N-(2-benzamidoethyl)-N-n-propylamino]tetralin (5-OMe-BPAT, 1). For this purpose, a combination of indirect molecular modeling and direct construction of the seven transmembrane (7TM) domains of the receptors was employed in a stepwise, objective manner. Pharmacophore models and corresponding receptor maps were identified by superimposing selected sets of receptor agonists in their presumed pharmacologically active conformations, while taking the conformational freedom of the ligands into account. The 7TM models were then constructed around the agonist pharmacophore models, by adding the TM domains one-by-one. Initially, the relative positions of TM3, TM4, and TM5 were determined using the three-dimensional structure of bacteriorhodopsin, but subsequently the orientations of all TM domains were adjusted in order to mimic the topology of the TM domains of rhodopsin. The presumed dopamine D2 receptor binding conformations of (S)- and (R)-1 were determined by using the semirigid dopamine D2 receptor antagonist N-benzylpiquindone as a template for superposition. Similarly, the selective serotonin 5-HT1A receptor agonist flesinoxan was employed for identifying the serotonin 5-HT1A receptor binding conformations of the enantiomers of 1. After docking of the presumed pharmacologically active conformations in the 7TM models and subsequent optimization of the binding sites, specific interactions between the ligands and the surrounding amino acid residues, consistent with the structure-activity relationships, were observed. Thus, both enantiomers of 1 bound to the dopamine D2 receptor model in a similar fashion: a reinforced electrostatic interaction was present between the protonated nitrogen atoms and Asp114 in TM3; their carbonyl groups accepted a H-bond from Ser121 in TM3; their amide NH groups acted as H-bond donor to Tyr416 in TM7; and their benzamide phenyl rings were involved in a hydrophobic edge-to-face interaction with Trp386 in TM6. Differences were observed in the orientations of the 2-aminotetralin moieties, which occupied the agonist binding site. Whereas the (S)-enantiomer could form a H-bond between its 5-methoxy substituent and Ser193 in TM5, the (R)-enantiomer could not, which may account for the differences in their intrinsic efficacies at the dopamine D2 receptor. In the serotonin 5-HT1A receptor model, the benzamide phenyl rings of both enantiomers were involved in hydrophobic face-to-face interactions with Phe112 in TM3, while their protonated nitrogen atoms formed a reinforced electrostatic interaction with Asp116 in TM3. Consistent with the structure-affinity relationships of 1, the amide moieties were not involved in specific interactions. Both enantiomers of 1 could form a hydrogen bond between their 5-methoxy substituent and Thr200 in TM5, which may account for their full serotonin 5-HT1A receptor agonist properties.
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MESH Headings
- Amino Acid Sequence
- Benzamides/metabolism
- Binding Sites
- Humans
- Models, Molecular
- Molecular Sequence Data
- Mutagenesis, Site-Directed
- Protein Binding
- Receptors, Dopamine D2/chemistry
- Receptors, Dopamine D2/genetics
- Receptors, Dopamine D2/metabolism
- Receptors, Serotonin/chemistry
- Receptors, Serotonin/genetics
- Receptors, Serotonin/metabolism
- Receptors, Serotonin, 5-HT1
- Sequence Homology, Amino Acid
- Stereoisomerism
- Tetrahydronaphthalenes/metabolism
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Affiliation(s)
- E J Homan
- Department of Medicinal Chemistry, University Centre for Pharmacy, University of Groningen, The Netherlands.
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22
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Caldirola P, Chowdhury R, Unelius L, Mohell N, Hacksell U, Johansson AM. Novel derivatives of 3-(dipropylamino)chroman. Interactions with 5-HT1A and D2A receptors. Bioorg Med Chem Lett 1999; 9:1583-6. [PMID: 10386940 DOI: 10.1016/s0960-894x(99)00232-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Novel 8-aryl and 8-aroyl substituted derivatives of 3-(dipropylamino)chroman are described. The compounds have been prepared by a palladium catalyzed reaction of iodoarenes and a stannylated derivative of [eta6-3-(dipropylamino)chroman]Cr(CO)3. Several of the compounds have high affinity for 5-HT1A receptors whereas the affinity for D2A receptors is lower, the 8-arylated derivatives being slightly more potent than the 8-aroylated analogues.
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Affiliation(s)
- P Caldirola
- Organic Pharmaceutical Chemistry, Uppsala Biomedical Centre, Uppsala University, Sweden
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23
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Spedding M, Newman-Tancredi A, Millan MJ, Dacquet C, Michel AN, Jacoby E, Vickery B, Tallentire D. Interaction of the anxiogenic agent, RS-30199, with 5-HT1A receptors: modulation of sexual activity in the male rat. Neuropharmacology 1998; 37:769-80. [PMID: 9707291 DOI: 10.1016/s0028-3908(98)00065-3] [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: 11/15/2022]
Abstract
RS-30199 has been shown previously to have atypical interactions at 5-HT1A receptors. RS-30199 and RS-64459, an analogue of buspirone with a buspirone side chain, were compared with the classic, partial agonist at 5-HT1A receptors, 8-hydroxy-2 (di-n-propylamino) tetralin (8-OH-DPAT) and buspirone. At human (h) 5-HT1A receptors in CHO cells, RS-30199-193 (racemate) and its enantiomers (-197, -198) inhibited [3H]-8-OH-DPAT binding (RS-30199-198, ki, 29.7 +/- 11.7 nM; RS-30199-197, ki, 74.1 +/- 11.7 nM) as did RS-64459 (ki, 24.9 +/- 6.0 nM), but RS-30199-197 and -198 were almost full agonists in a [35S]-GTPgammaS binding assay, whereas RS-64459 was a partial agonist, resembling buspirone and 8-OH-DPAT. RS-64459 and the enantiomers of RS-30199 had weaker affinity for 5-HT2C and 5-HT7 receptors. These compounds did not induce the 5-HT behavioural syndrome in male rats. However, in a model where naive male rats were introduced to estrogen-progesterone primed, sexually receptive female rats, RS-30199-197 (0.1, 1, 10 mg/kg, s.c.) had a profound inhibitory effect on sexual behaviour score. Neither buspirone nor 8-OH-DPAT reduced the sexual behaviour score. Unlike 8-OH-DPAT, which shortens intromission latency, RS-30199 prolonged intromission latency. RS-30199 (10 mg/kg s.c.) fully inhibited the facilitation of sexual behaviour caused by the alpha2-adrenoceptor antagonist, delequamine (0.1 mg/kg, p.o.). In contrast, RS-64459 (100, 250, 1000 and 4000 microg/kg, s.c.) failed to modify the sexual behaviour score and did not modify intromission latency. The differences between the effects of RS-30199 and RS-64459 in binding and functional experiments are supported by molecular models of the receptor-ligand interaction, where the compounds interact in different ways with the receptor; a model is proposed for the allosteric interaction of different agents with the receptor, resulting in different functional profiles. RS-30199 can be considered an atypical agonist at 5-HT1A receptors.
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Affiliation(s)
- M Spedding
- Institut de Internationales, Servier, Croissy Research Centre, Paris, France.
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