Multitarget Derivatives of D2AAK1 as Potential Antipsychotics: The Effect of Substitution in the Indole Moiety.

Schizophrenia is a complex disease which is best treated with multitarget drugs, such as atypical antipsychotics. Previously, using structure-based virtual screening, we found a virtual hit, D2AAK1, with nanomolar affinity for dopamine and serotonin receptors important in schizophrenia pharmacotherapy. As a part of an optimization campaign of D2AAK1, we obtained 17 derivatives that also display a multitarget profile. Selected compounds were tested against off-targets in schizophrenia, i. e., histamine H1 receptor and muscarinic M1 receptor, and these did not display considerable affinity for these receptors. The two most promising compounds were subjected to behavioral studies. These compounds decreased amphetamine-induced hyperactivity in mice which indicates their antipsychotic potential. The compounds did not interfere with the memory consolidation in mice, as determined in the passive avoidance test. The favorable pharmacological profile of these compounds was rationalized using molecular modeling.