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Differential effects of antipsychotic and propsychotic drugs on prepulse inhibition and locomotor activity in Roman high- (RHA) and low-avoidance (RLA) rats

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  • Ignasi Oliveras
  • Ana Sánchez-González
  • Daniel Sampedro-Viana
  • Maria Antonietta Piludu
  • Cristóbal Río-Alamos
  • Osvaldo Giorgi
  • Maria G Corda
  • Susana Aznar
  • Javier González-Maeso
  • Cristina Gerbolés
  • Gloria Blázquez
  • Toni Cañete
  • Adolf Tobeña
  • Alberto Fernández-Teruel
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RATIONALE: Animal models with predictive and construct validity are necessary for developing novel and efficient therapeutics for psychiatric disorders.

OBJECTIVES: We have carried out a pharmacological characterization of the Roman high- (RHA-I) and low-avoidance (RLA-I) rat strains with different acutely administered propsychotic (DOI, MK-801) and antipsychotic drugs (haloperidol, clozapine), as well as apomorphine, on prepulse inhibition (PPI) of startle and locomotor activity (activity cages).

RESULTS: RHA-I rats display a consistent deficit of PPI compared with RLA-I rats. The typical antipsychotic haloperidol (dopamine D2 receptor antagonist) reversed the PPI deficit characteristic of RHA-I rats (in particular at 65 and 70 dB prepulse intensities) and reduced locomotion in both strains. The atypical antipsychotic clozapine (serotonin/dopamine receptor antagonist) did not affect PPI in either strain, but decreased locomotion in a dose-dependent manner in both rat strains. The mixed dopamine D1/D2 agonist, apomorphine, at the dose of 0.05 mg/kg, decreased PPI in RHA-I, but not RLA-I rats. The hallucinogen drug DOI (5-HT2A agonist; 0.1-1.0 mg/kg) disrupted PPI in RLA-I rats in a dose-dependent manner at the 70 dB prepulse intensity, while in RHA-I rats, only the 0.5 mg/kg dose impaired PPI at the 80 dB prepulse intensity. DOI slightly decreased locomotion in both strains. Finally, clozapine attenuated the PPI impairment induced by the NMDA receptor antagonist MK-801 only in RLA-I rats.

CONCLUSIONS: These results add experimental evidence to the view that RHA-I rats represent a model with predictive and construct validity of some dopamine and 5-HT2A receptor-related features of schizophrenia.

Original languageEnglish
JournalPsychopharmacology
Volume234
Issue number6
Pages (from-to)957-975
Number of pages19
ISSN0033-3158
DOIs
Publication statusPublished - Mar 2017

    Research areas

  • Amphetamines, Animals, Antipsychotic Agents, Apomorphine, Avoidance Learning, Clozapine, Dizocilpine Maleate, Dopamine Agonists, Dopamine Antagonists, Excitatory Amino Acid Antagonists, Haloperidol, Locomotion, Male, Prepulse Inhibition, Rats, Receptor, Serotonin, 5-HT2A, Reflex, Startle, Schizophrenia, Serotonin 5-HT2 Receptor Agonists, Serotonin Antagonists, Journal Article

ID: 52335338