Add time:07/12/2019         Source:sciencedirect.com

Investigations on the pharmacological properties of a series of chroman derivatives indicated that 5-methoxy-3-(di-n-propylamino)chroman (5-MeO-DPAC) acts in the nM range on 5-HT1A sites but recognizes very poorly other 5-HT sites and D2 sites in rat brain membranes. As expected from these observations, the tritiated derivative [3H]5-MeO-DPAC bound to a single class of specific sites which exhibited the same pharmacological properties as 5-HT1A sites labelled by [3H]8-OH-DPAT in hippocampal and cortical membranes. In contrast to [3H]8-OH-DPAT, [3H]5-MeO-DPAC did not bind to presynaptic striatal sites (possibly associated with 5-HT reuptake in serotoninergic terminals), which indicated that this new chroman derivative was even more selective than the [3H]tetralin ligand for the in vitro labelling of 5-HT1A sites. Comparison of the chemical structures of 5-MeO-DPAC and other 5-HT1A ligands suggests that electronic enrichment due to isosteric O-substitution in the chroman derivative may play an important role in the highly selective recognition of the 5-HT1A receptor by this drug.

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