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Gharat R, Prabhu A, Khambete MP. Potential of triazines in Alzheimer's disease: A versatile privileged scaffold. Arch Pharm (Weinheim) 2022; 355:e2100388. [DOI: 10.1002/ardp.202100388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 12/13/2021] [Accepted: 12/15/2021] [Indexed: 11/10/2022]
Affiliation(s)
- Ruchita Gharat
- SVKM's Dr. Bhanuben Nanavati College of Pharmacy Mumbai Maharashtra India
| | - Arati Prabhu
- SVKM's Dr. Bhanuben Nanavati College of Pharmacy Mumbai Maharashtra India
| | - Mihir. P. Khambete
- SVKM's Dr. Bhanuben Nanavati College of Pharmacy Mumbai Maharashtra India
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Tosh DK, Salmaso V, Rao H, Bitant A, Fisher CL, Lieberman DI, Vorbrüggen H, Reitman ML, Gavrilova O, Gao ZG, Auchampach JA, Jacobson KA. Truncated (N)-Methanocarba Nucleosides as Partial Agonists at Mouse and Human A 3 Adenosine Receptors: Affinity Enhancement by N6-(2-Phenylethyl) Substitution. J Med Chem 2020; 63:4334-4348. [PMID: 32271569 PMCID: PMC7443318 DOI: 10.1021/acs.jmedchem.0c00235] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Dopamine-derived N6-substituents, compared to N6-(2-phenylethyl), in truncated (N)-methanocarba (bicyclo[3.1.0]hexyl) adenosines favored high A3 adenosine receptor (AR) affinity/selectivity, e.g., C2-phenylethynyl analogue 15 (MRS7591, Ki = 10.9/17.8 nM, at human/mouse A3AR). 15 was a partial agonist in vitro (hA3AR, cAMP inhibition, 31% Emax; mA3AR, [35S]GTP-γ-S binding, 16% Emax) and in vivo and also antagonized hA3AR in vitro. Distal H-bonding substitutions of the N6-(2-phenylethyl) moiety particularly enhanced mA3AR affinity by polar interactions with the extracellular loops, predicted using docking and molecular dynamics simulation with newly constructed mA3AR and hA3AR homology models. These hybrid models were based on an inactive antagonist-bound hA1AR structure for the upper part of TM2 and an agonist-bound hA2AAR structure for the remaining TM portions. These species-independent A3AR-selective nucleosides are low efficacy partial agonists and novel, nuanced modulators of the A3AR, a drug target of growing interest.
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Affiliation(s)
| | | | | | - Amelia Bitant
- Department of Pharmacology, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI, USA 53226
| | - Courtney L. Fisher
- Department of Pharmacology, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI, USA 53226
| | | | - Helmut Vorbrüggen
- Institut für Chemie und Biochemie, Freie Universität, Takustr. 3, D-14195 Berlin, Germany
| | | | - Oksana Gavrilova
- Mouse Metabolism Core, National Institute of Diabetes and Digestive and Kidney Disease, National Institutes of Health, 9000 Rockville Pike, Bethesda, MA, USA 20892
| | | | - John A. Auchampach
- Department of Pharmacology, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI, USA 53226
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Giovannoni MP, Ciciani G, Cilibrizzi A, Crocetti L, Daniele S, Di Cesare Mannelli L, Ghelardini C, Giacomelli C, Guerrini G, Martini C, Trincavelli ML, Vergelli C. Further studies on pyrazolo[1',5':1,6]pyrimido[4,5-d]pyridazin-4(3H)-ones as potent and selective human A1 adenosine receptor antagonists. Eur J Med Chem 2014; 89:32-41. [PMID: 25462223 DOI: 10.1016/j.ejmech.2014.10.020] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Revised: 09/29/2014] [Accepted: 10/09/2014] [Indexed: 11/30/2022]
Abstract
A new series of pyrazolo[1',5':1,6]pyrimido[4,5-d]pyridazin-4(3H)-ones was synthesized and tested in radioligand binding assays on human A1, A2A and A3 adenosine receptors. Most of the compounds showed high selectivity of action towards A1 receptor and high affinity with Ki values in the low nanomolar range. The pharmacological profile of the most active molecules towards A1 adenosine receptors was evaluated in cAMP functional assay. Compounds demonstrated their ability to completely counteract the effect of the agonist NECA, thus demonstrating their antagonist profile. Moreover, the most interesting compound, tested in the mouse passive avoidance, exhibited an antiamnesic effect at the doses of 10 and 30 mg/kg.
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Affiliation(s)
- Maria Paola Giovannoni
- Dipartimento NEUROFARBA, Sezione Farmaceutica e Nutraceutica, Università degli Studi di Firenze, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Italy.
| | - Giovanna Ciciani
- Dipartimento NEUROFARBA, Sezione Farmaceutica e Nutraceutica, Università degli Studi di Firenze, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Italy
| | - Agostino Cilibrizzi
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, UK
| | - Letizia Crocetti
- Dipartimento NEUROFARBA, Sezione Farmaceutica e Nutraceutica, Università degli Studi di Firenze, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Italy
| | - Simona Daniele
- Dipartimento di Farmacia, Università degli Studi di Pisa, Via Bonanno 6, 56126 Pisa, Italy
| | - Lorenzo Di Cesare Mannelli
- NEUROFARBA, Sezione Farmacologia e Tossicologia, Università degli Studi di Firenze, Viale Pieraccini 6, 50139 Firenze, Italy
| | - Carla Ghelardini
- NEUROFARBA, Sezione Farmacologia e Tossicologia, Università degli Studi di Firenze, Viale Pieraccini 6, 50139 Firenze, Italy
| | - Chiara Giacomelli
- Dipartimento di Farmacia, Università degli Studi di Pisa, Via Bonanno 6, 56126 Pisa, Italy
| | - Gabriella Guerrini
- Dipartimento NEUROFARBA, Sezione Farmaceutica e Nutraceutica, Università degli Studi di Firenze, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Italy
| | - Claudia Martini
- Dipartimento di Farmacia, Università degli Studi di Pisa, Via Bonanno 6, 56126 Pisa, Italy
| | | | - Claudia Vergelli
- Dipartimento NEUROFARBA, Sezione Farmaceutica e Nutraceutica, Università degli Studi di Firenze, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Italy
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Inamdar GS, Pandya AN, Thakar HM, Sudarsanam V, Kachler S, Sabbadin D, Moro S, Klotz KN, Vasu KK. New insight into adenosine receptors selectivity derived from a novel series of [5-substituted-4-phenyl-1,3-thiazol-2-yl] benzamides and furamides. Eur J Med Chem 2013; 63:924-34. [PMID: 23685887 DOI: 10.1016/j.ejmech.2013.03.020] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Revised: 02/21/2013] [Accepted: 03/09/2013] [Indexed: 11/28/2022]
Abstract
A series of [5-substituted-4-phenyl-1,3-thiazol-2-yl] benzamide and furamide analogues were investigated in radioligand binding studies at adenosine receptor subtypes with an aim to obtain potent and selective adenosine receptor ligands. Benzamide and furamide linked to thiazole was found to be crucial for high adenosine receptor affinity. The most potent compound indentified in this study was 5d with low nanomolar affinity for all four adenosine receptor subtypes. Compounds 5a and 5g showed moderate selectivity for A2A adenosine receptors. Molecular docking versus all four human adenosine receptors combined with membrane molecular dynamics studies were performed to rationalise the peculiar selectivity profile of 5d antagonist.
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Affiliation(s)
- Gajanan S Inamdar
- Department of Medicinal Chemistry, B.V. Patel Pharmaceutical Education and Research Development, Ahmedabad 380 054, Gujarat, India
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Vernall AJ, Stoddart LA, Briddon SJ, Hill SJ, Kellam B. Highly potent and selective fluorescent antagonists of the human adenosine A₃ receptor based on the 1,2,4-triazolo[4,3-a]quinoxalin-1-one scaffold. J Med Chem 2012; 55:1771-82. [PMID: 22277057 DOI: 10.1021/jm201722y] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The adenosine-A(3) receptor (A(3)AR) is a G protein-coupled receptor that shows promise as a therapeutic target for cancer, glaucoma, and various autoimmune inflammatory disorders, and as such, there is a need for molecular probes to study this receptor. Here, we report a series of fluorescent ligands containing different linkers and fluorophores based around a 1,2,4-triazolo[4,3-a]quinoxalin-1-one antagonist. One of these conjugates (19) displayed high affinity for the A(3)AR (pK(D) = 9.36 ± 0.12) and is >650-fold selective over other adenosine receptor subtypes. Confocal microscopy revealed clear, displaceable membrane labeling of CHO-A(3) cells with 19, with no detectable labeling of CHO-A(1) cells under identical conditions. This fluorescent ligand was also able to specifically label the A(3)AR in HEK293T cells containing a mixed adenosine receptor population. The subtype specificity, along with its excellent imaging properties, make 19 an ideal tool for studying A(3)AR distribution and organization, particularly in the presence of other adenosine receptor subtypes.
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Affiliation(s)
- Andrea J Vernall
- School of Pharmacy, Centre for Biomolecular Sciences, University of Nottingham, United Kingdom
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