Article (Scientific journals)
5-HT2A receptor antagonism potentiates haloperidol-induced dopamine release in rat medial prefrontal cortex and inhibits that in the nucleus accumbens in a dose-dependent manner
Liégeois, Jean-François; Ichikawa, J.; Meltzer, H. Y.
2002In Brain Research, 947 (2), p. 157-165
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Keywords :
catecholamine release
Abstract :
[en] Combined serotonin (5-HT)(2A) and dopamine (DA) D-2 blockade has been shown to contribute to the ability of atypical antipsychotic drugs (APDs) to increase DA release in rat medial prefrontal cortex (mPFC). We provide additional support for this hypothesis by examining the effect of the selective 5-HT2A antagonist M100907 plus haloperidol, a potent D, antagonist APD, on DA release in the mPFC and nucleus accumbens (NAC). Haloperidol (0.01-1.0 mg/kg) produced an inverted U-shaped increase in DA release in the mPFC, with a significant increase only at 0.1 mg/kg. Haloperidol (0.1 and 1.0 mg/kg) significantly increased DA release in the NAC. M100907 (0.1 mg/kg) by itself had no effect on DA release in either region. This dose of M100907 potentiated the ability of low (0.01-0.1 mg/kg), but not high dose (0.3-1.0 mg/kg) haloperidol to increase mPFC DA release, whereas it abolished the effect of both 0.1 and 1.0 mg/ka haloperidol on NAC DA release. These results suggest that the relatively higher ratio of 5-HT2A to D-2 antagonism may contribute to the potentiation of haloperidol-induced mPFC DA release, whereas 5-HT2A antagonism can diminish haloperidol-induced NAC DA release, even when combined with extensive D, antagonism, which may not be synergistic with 5-HT2A antagonism in the mPFC. (C) 2002 Elsevier Science B.V. All rights reserved.
Disciplines :
Neurosciences & behavior
Author, co-author :
Liégeois, Jean-François ;  Université de Liège - ULiège > Département de pharmacie > Chimie pharmaceutique
Ichikawa, J.
Meltzer, H. Y.
Language :
English
Title :
5-HT2A receptor antagonism potentiates haloperidol-induced dopamine release in rat medial prefrontal cortex and inhibits that in the nucleus accumbens in a dose-dependent manner
Publication date :
30 August 2002
Journal title :
Brain Research
ISSN :
0006-8993
eISSN :
1872-6240
Publisher :
Elsevier Science Bv, Amsterdam, Netherlands
Volume :
947
Issue :
2
Pages :
157-165
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 09 January 2009

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