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Trapani, Giuseppe; Laquintana, Valentino; Denora, Nunzio; Trapani, Adriana; Lopedota, Angela; Latrofa, Andrea; Franco, Massimo; Serra, Mariangela; Pisu, Maria Giuseppina; Floris, Ivan; Sanna, Enrico; Biggio, Giovanni; Liso, Gaetano
Journal of medicinal chemistry, 01/2005, Volume: 48, Issue: 1Journal Article
A series of 36 imidazopyridineacetamides (2−37) were designed and synthesized to evaluate the effects of structural changes on the amide nitrogen at both central (CBRs) and peripheral benzodiazepine receptors (PBRs). These changes include variations in the length and number of the alkyl groups as well as introduction of different aromatic, heteroaromatic, and conformationally constrained groups. The affinities of these compounds for CBRs and PBRs were determined, and the results indicate that bulkiness of the substituents, their branching, and length beyond an optimal value may cause hindrance to the ligand in its interaction with the receptor. The presence of aromatic or conformationally constrained substituents on the carboxamide nitrogen can be conducive to high affinity and selectivity. Furthermore, the ability of a subset of the most active ligands to stimulate synthesis of neuroactive steroids in plasma and brain was evaluated in vivo and in vitro. Compound 3 exhibited very marked effects on the peripheral and central synthesis of neuroactive steroids, while 36 (potent at subnanomolar level) showed a slight ability to affect neuroactive steroid content in the cerebral cortex.
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