Discovery of Functionally Selective 7,8,9,10-Tetrahydro-7,10-ethano-1,2,4-triazolo[3,4-a]phthalazines as GABAAReceptor Agonists at the α3Subunit
Models, Molecular
Binding Sites
Patch-Clamp Techniques
Triazoles
Receptors, GABA-A
01 natural sciences
Cell Line
0104 chemical sciences
Protein Subunits
Radioligand Assay
Structure-Activity Relationship
Xenopus laevis
Oocytes
Animals
Humans
Phthalazines
Female
GABA-A Receptor Agonists
DOI:
10.1021/jm040883v
Publication Date:
2005-03-03T05:24:35Z
AUTHORS (17)
ABSTRACT
We have previously identified the 7,8,9,10-tetrahydro-7,10-ethano-1,2,4-triazolo[3,4-a]phthalazine (1) as a potent partial agonist for the alpha(3) receptor subtype with 5-fold selectivity in binding affinity over alpha(1). This paper describes a detailed investigation of the substituents on this core structure at both the 3- and 6-positions. Despite evaluating a wide range of groups, the maximum selectivity that could be achieved in terms of affinity for the alpha(3) subtype over the alpha(1) subtype was 12-fold (for 57). Although most analogues showed no selectivity in terms of efficacy, some did show partial agonism at alpha(1) and antagonism at alpha(3) (e.g., 25 and 75). However, two analogues tested (93 and 96), both with triazole substituents in the 6-position, showed significantly higher efficacy for the alpha(3) subtype over the alpha(1) subtype. This was the first indication that selectivity in efficacy in the required direction could be achieved in this series.
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