Naunyn-Schmiedeberg's Archives of Pharmacology

, Volume 380, Issue 5, pp 383–397 | Cite as

Potentiation of excitatory serotonergic responses by MK-801 in the medial prefrontal cortex

  • Benoit Labonte
  • Francis Rodriguez Bambico
  • Gabriella GobbiEmail author


New atypical antipsychotics show a greater affinity to serotonergic rather than to dopamine receptors, suggesting that serotonin (5-HT) has a major role in the pathophysiology and treatment of schizophrenia. The goal of this study was to characterise the response of pyramidal neurons in the medial prefrontal cortex (mPFC) to 5-HT and NMDA before and after administration of the NMDA receptor antagonist, MK-801 (dizocilpine), a well-validated pharmacological model of psychosis. mPFC pyramidal (glutamatergic) neurons were recorded in urethane-anaesthetised rats. The responses to NMDA and 5-HT were assessed using in vivo electrophysiology and microiontophoresis. The 5-HT2A/2C antagonist ritanserin and the 5-HT1A antagonist WAY100635 were used to block 5-HT responses. MK-801 decreased the NMDA-induced excitatory responses and increased NMDA-evoked burst activity among mPFC pyramidal neurons. Three subpopulations of pyramidal cells were identified according to their responses to 5-HT: excitation (33%), inhibition (40%) and non-response (27%). The inhibitory responses were blocked by WAY100635 in 100% of cases, but not by ritanserin; the excitatory responses were blocked by ritanserin in 75% of cases, but not by WAY100635. The administration of MK-801 potentiated the firing rate of excitatory responses but did not modify the inhibitory responses induced by microiontophoretic application of 5-HT. These results suggest that MK-801 modifies 5-HT synapses in the mPFC by potentiating the excitatory 5-HT2A/2C responses and attenuating NMDA excitations. These data indicate that 5-HT excitatory transmission is selectively impaired at the mPFC level in this pharmacological model of schizophrenia.


Medial prefrontal cortex (mPFC) Serotonin 2A/2C (5-HT2A/2C) receptors Glutamate Schizophrenia Electrophysiology NMDA antagonist Ritanserin 


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Benoit Labonte
    • 1
    • 2
  • Francis Rodriguez Bambico
    • 1
  • Gabriella Gobbi
    • 1
    • 2
    Email author
  1. 1.Neurobiological Psychiatry Unit, Department of PsychiatryMcGill UniversityMontréalCanada
  2. 2.Department of Psychiatry, Centre de Recherche Fernand Seguin, Hôpital L.-H. LafontaineUniversité de MontréalMontréalCanada

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