The role of 5-hydroxytryptamine 7 receptors in the phencyclidine-induced novel object recognition deficit in rats

M. Horiguchi, M. Huang, Herbert Y. Meltzer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

121 Scopus citations


The role of 5-hydroxytryptamine (serotonin) (5-HT)7 receptor antagonism in the actions of atypical antipsychotic drugs (APDs), e.g., amisulpride, clozapine, and lurasidone, if any, is uncertain. We examined the ability of 5-HT7 receptor antagonism alone and as a component of amisulpride and lurasidone to reverse deficits in rat novel object recognition (NOR) produced by subchronic treatment with the N-methyl-D-aspartate receptor antagonist phencyclidine (PCP), and we examined the ability of supplemental 5-HT7 antagonism to augment the inability of sulpiride, haloperidol, and (1R,4R,5S,6R)-4-amino-2-oxabicyclo[3.1.0]hexane-4,6-dicarboxylic acid (LY379268), a metabotropic glutamate receptor (mGluR) 2/3 agonist, which lack 5-HT7 antagonism, to reverse the NOR deficit. The 5-HT7 receptor antagonist, (2R)-1-[(3-hydroxyphenyl)sulfonyl]-2-[2-(4-methyl-1- piperidinyl)ethyl]pyrrolidine (SB269970) (0.1-1 mg/kg) dose-dependently reversed PCP-induced NOR deficits. In addition, the ability of lurasidone (0.1 mg/kg) and amisulpride (3 mg/kg) to reverse this deficit was blocked by cotreatment with the 5-HT7 receptor agonist (2S)-(+)-5-(1,3,5-trimethylpyrazol-4- yl)-2-(dimethylamino)tetralin (AS19) (5-10 mg/kg), which did not affect NOR in naive rats. Sulpiride, a less potent 5-HT7 antagonist than amisulpride, did not itself improve the PCP-induced NOR deficit. However, a subeffective dose of SB269970 (0.1 mg/kg) in combination with subeffective doses of lurasidone (0.03 mg/kg), amisulpride (1 mg/kg), or sulpiride (20 mg/kg), also reversed the PCP-induced NOR deficit. Pimavanserin, a 5-HT2A inverse agonist, LY379268, and haloperidol did not potentiate the ability of subeffective SB269970 to improve the NOR deficit. Furthermore, the mGluR2/3 antagonist (2S)-2-amino-2-[(1S,2S)-2-carboxycycloprop-1-yl]-3-(xanth-9-yl) propanoic acid (LY341495), which blocks the effect of clozapine to reverse the NOR deficit, did not block the SB269970-induced amelioration of the NOR deficit. These results suggest 5-HT7 antagonism may contribute to the efficacy of some atypical APDs in the treatment of cognitive impairment in schizophrenia and may itself have some benefit in this regard.

Original languageEnglish (US)
Pages (from-to)605-614
Number of pages10
JournalJournal of Pharmacology and Experimental Therapeutics
Issue number2
StatePublished - Aug 1 2011

ASJC Scopus subject areas

  • Molecular Medicine
  • Pharmacology


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