Serotonin-glutamate and Serotonin-dopamine Reciprocal Interactions As Putative Molecular Targets for Novel Antipsychotic Treatments: from Receptor Heterodimers to Postsynaptic Scaffolding and Effector Proteins

Overview

Journal Psychopharmacology (Berl)

Specialty Pharmacology

Date 2012 Nov 27

PMID 23179966

Citations 46

Authors

A de Bartolomeis

E F Buonaguro

F Iasevoli

Affiliations

Soon will be listed here.

Abstract

The physical and functional interactions between serotonin-glutamate and serotonin-dopamine signaling have been suggested to be involved in psychosis pathophysiology and are supposed to be relevant for antipsychotic treatment. Type II metabotropic glutamate receptors (mGluRs) and serotonin 5-HT(2A) receptors have been reported to form heterodimers that modulate G-protein-mediated intracellular signaling differentially compared to mGluR2 and 5-HT(2A) homomers. Additionally, direct evidence has been provided that D(2) and 5-HT(2A) receptors form physical heterocomplexes which exert a functional cross-talk, as demonstrated by studies on hallucinogen-induced signaling. Moving from receptors to postsynaptic density (PSD) scenario, the scaffolding protein PSD-95 is known to interact with N-methyl-D-aspartate (NMDA), D(2) and 5-HT(2) receptors, regulating their activation state. Homer1a, the inducible member of the Homer family of PSD proteins that is implicated in glutamatergic signal transduction, is induced in striatum by antipsychotics with high dopamine receptor affinity and in the cortex by antipsychotics with mixed serotonergic/dopaminergic profile. Signaling molecules, such as Akt and glycogen-synthase-kinase-3 (GSK-3), could be involved in the mechanism of action of antipsychotics, targeting dopamine, serotonin, and glutamate neurotransmission. Altogether, these proteins stand at the crossroad of glutamate-dopamine-serotonin signaling pathways and may be considered as valuable molecular targets for current and new antipsychotics. The aim of this review is to provide a critical appraisal on serotonin-glutamate and serotonin-dopamine interplay to support the idea that next generation schizophrenia pharmacotherapy should not exclusively rely on receptor targeting strategies.

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