Our hypothesis that a beta-phenyldopamine moiety could serve as a dopamine D1 receptor pharmacophore has received strong support by our finding that (+)-trans-10,11-dihydroxy-hexahydrobenzo[a]phenanthridine (dihydrexidine) is a potent and selective dopamine D1 full agonist. Based on the near coplanarity of the two aromatic rings in dihydrexidine, we hypothesize that full efficacy agonists must be able to adopt a similar conformation, while for antagonists, the two rings may reside more skewed with respect to each other. The present proposal presents, for synthesis and pharmacological evaluation, an extensive series of conformationally-defined novel tetracyclic molecules designed around the beta-phenyldopamine template. Low energy conformations of the various molecules present the two aromatic rings of the pharmacophore in a variety of relative orientations, and the ethylamine fragment of the dopamine moiety in several conformations. The molecular fragments used to tither the pharmacophore are placed in several different locations, and the N-alkyl substituents will also be varied. Pharmacological evaluation, initially using in vitro methods, and later in vivo assays for interesting compounds, will focus on dopamine D1/D2 receptor selectivity, agonist versus antagonist activity, and for agonists, whether or not they are full efficacy. The biological data will then be considered in the context of conformational and steric properties of the molecules. Proprietary software routines, as embodied SYBYL and CHARMm will be used for energy minimization, and generation of receptor essential and receptor excluded volumes. It is anticipated that, with the range of molecules proposed for study, very well-defined conceptual models of the dopamine D1 receptor can be developed. These may encompass differing requirements for agonist versus antagonist binding, and may allow similarities and differences between the D1 and D2 receptors to be more clearly defined.

Agency
National Institute of Health (NIH)
Institute
National Institute of Mental Health (NIMH)
Type
Research Project (R01)
Project #
5R01MH042705-10
Application #
3381963
Study Section
Neurosciences Research Review Committee (BPN)
Project Start
1987-04-01
Project End
1996-03-31
Budget Start
1993-04-01
Budget End
1994-03-31
Support Year
10
Fiscal Year
1993
Total Cost
Indirect Cost
Name
Purdue University
Department
Type
Schools of Pharmacy
DUNS #
072051394
City
West Lafayette
State
IN
Country
United States
Zip Code
47907
Clark, Alia H; McCorvy, John D; Conley, Jason M et al. (2012) Identification of a 2-phenyl-substituted octahydrobenzo[f]quinoline as a dopamine Dýýý receptor-selective full agonist ligand. Bioorg Med Chem 20:6366-74
Chemel, Benjamin R; Bonner, Lisa A; Watts, Val J et al. (2012) Ligand-specific roles for transmembrane 5 serine residues in the binding and efficacy of dopamine D(1) receptor catechol agonists. Mol Pharmacol 81:729-38
Cueva, Juan Pablo; Chemel, Benjamin R; Juncosa Jr, Jose I et al. (2012) Analogues of doxanthrine reveal differences between the dopamine D1 receptor binding properties of chromanoisoquinolines and hexahydrobenzo[a]phenanthridines. Eur J Med Chem 48:97-107
Bonner, Lisa A; Laban, Uros; Chemel, Benjamin R et al. (2011) Mapping the catechol binding site in dopamine D? receptors: synthesis and evaluation of two parallel series of bicyclic dopamine analogues. ChemMedChem 6:1024-40
Cueva, Juan Pablo; Gallardo-Godoy, Alejandra; Juncosa, Jose I et al. (2011) Probing the steric space at the floor of the D1 dopamine receptor orthosteric binding domain: 7ýý-, 7ýý-, 8ýý-, and 8ýý-methyl substituted dihydrexidine analogues. J Med Chem 54:5508-21
Clark, Alia H; McCorvy, John D; Watts, Val J et al. (2011) Assessment of dopamine Dýýý receptor affinity and efficacy of three tetracyclic conformationally-restricted analogs of SKF38393. Bioorg Med Chem 19:5420-31
Bonner, Lisa A; Chemel, Benjamin R; Watts, Val J et al. (2010) Facile synthesis of octahydrobenzo[h]isoquinolines: novel and highly potent D1 dopamine agonists. Bioorg Med Chem 18:6763-70
Przybyla, Julie A; Cueva, Juan P; Chemel, Benjamin R et al. (2009) Comparison of the enantiomers of (+/-)-doxanthrine, a high efficacy full dopamine D(1) receptor agonist, and a reversal of enantioselectivity at D(1) versus alpha(2C) adrenergic receptors. Eur Neuropsychopharmacol 19:138-46
Cueva, Juan Pablo; Giorgioni, Gianfabio; Grubbs, Russell A et al. (2006) trans-2,3-dihydroxy-6a,7,8,12b-tetrahydro-6H-chromeno[3,4-c]isoquinoline: synthesis, resolution, and preliminary pharmacological characterization of a new dopamine D1 receptor full agonist. J Med Chem 49:6848-57
Ryman-Rasmussen, Jessica P; Nichols, David E; Mailman, Richard B (2005) Differential activation of adenylate cyclase and receptor internalization by novel dopamine D1 receptor agonists. Mol Pharmacol 68:1039-48

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