Title

Biphasic modulation of NMDA-induced responses in pyramidal cells of the medial prefrontal cortex by Y-931, a potential atypical antipsychotic drug

Document Type

Article

Abstract

Similar to the effects produced by the atypical antipsychotic drugs (APDs) clozapine and olanzapine, Y-931 {8-fluoro-12(4-methylpiperazin-1-yl)-6H-[1]benzothieno[2,3-b][1,5] benzodiazepine maleate, a purported atypical APD} effectively facilitated N-methyl-D-aspartate (NMDA)-induced, but not (±)-α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA)-evoked, responses in pyramidal cells of the rat medial prefrontal cortex (mPFC). Similar to olanzapine and clozapine, the concentration-response curve of Y-931 in these experiments was biphasic. At present, the mechanisms behind the biphasic modulatory actions of Y-931 and olanzapine on NMDA-induced currents in the mPFC are not clear. In addition to augmenting NMDA responses, Y-931 prevented the phencyclidine (PCP)-induced block of the NMDA responses and increased the amplitudes and durations of excitatory postsynaptic currents (EPSCs) evoked by electrical stimulation of the forceps minor. Overall, our findings suggest that APDs, particularly the atypical ones, share a common property in that they facilitate NMDA receptor-mediated transmission in the mPFC and perhaps other functionally related limbic structures as well, which could be the cellular basis for their ability to alleviate some schizophrenic negative symptoms and cognitive dysfunctions. © 2001 Wiley-Liss, Inc.

Publication Date

9-15-2001

Publication Title

Synapse

ISSN

08874476

Volume

41

Issue

4

First Page

294

Last Page

300

PubMed ID

11494400

Digital Object Identifier (DOI)

10.1002/syn.1086

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