The influence of substitution at aromatic part of 1,2,3,4-tetrahydroisoquinoline on in vitro and in vivo 5-HT(1A)/5-HT(2A) receptor activities of its 1-adamantoyloaminoalkyl derivatives

Further structure-activity relationship (SAR) studies with the 1,2,3,4-tetrahydroisoquinoline (THIQ) class of 5-HT(1A) ligands led to the synthesis of new 1-adamantoyloaminoalkyl derivatives. The impact of substituent variations in the aromatic part of THIQ moiety on 5-HT(1A) and 5-HT(2A) receptor a...

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Veröffentlicht in:Bioorganic & medicinal chemistry 2002-01, Vol.10 (1), p.87-95
Hauptverfasser: Bojarski, Andrzej J, Mokrosz, Maria J, Minol, Sijka Charakchieva, Kozioł, Aneta, Wesołowska, Anna, Tatarczyńska, Ewa, Kłodzińska, Aleksandra, Chojnacka-Wójcik, Ewa
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Sprache:eng
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Zusammenfassung:Further structure-activity relationship (SAR) studies with the 1,2,3,4-tetrahydroisoquinoline (THIQ) class of 5-HT(1A) ligands led to the synthesis of new 1-adamantoyloaminoalkyl derivatives. The impact of substituent variations in the aromatic part of THIQ moiety on 5-HT(1A) and 5-HT(2A) receptor affinities, as well as in vivo functional properties of the investigated compounds were discussed. It was found that those modifications reduced the binding affinity for 5-HT(1A) receptors (in comparison with unsubstituted THIQ derivatives); however, the majority of new compounds still remained potent 5-HT(1A) ligands (K(i)=4.9-46 nM) and most of them showed features of partial agonists of postsynaptic 5-HT(1A) receptors. At the same time, their 5-HT(2A) receptor affinity was slightly increased (K(i)=40-1475 nM), which resulted in a loss of 5-HT(2A)/5-HT(1A) selectivity. 5-Br,8-OCH3 derivative-the most potent, mixed 5-HT(1A)/5-HT(2A) ligand-produced activation of presynaptic 5-HT(1A) receptors and showed properties of a 5-HT(2A) receptor antagonist.
ISSN:0968-0896