Potentiation of latent inhibition by haloperidol and clozapine is attenuated in Dopamine D2 receptor (Drd-2) deficient mice: Do antipsychotics influence learning to ignore irrelevant stimuli via both Drd-2 and non-Drd-2 mechanisms?

O'Callaghan, M.J., Bay-Richter, C., O’ Tuathaigh, Colm M.P., Heery, David M., Waddington, J.L. and Moran, Paula M. (2014) Potentiation of latent inhibition by haloperidol and clozapine is attenuated in Dopamine D2 receptor (Drd-2) deficient mice: Do antipsychotics influence learning to ignore irrelevant stimuli via both Drd-2 and non-Drd-2 mechanisms? Journal of Psychopharmacology, 28 (10). pp. 973-977. ISSN 1461-7285

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Abstract

Whether the dopamine Drd-2 receptor is necessary for the behavioural action of antipsychotic drugs is an important question, as Drd-2 antagonism is responsible for their debilitating motor side effects. Using Drd-2 null mice (Drd2 -/-) it has previously been shown that Drd-2 is not necessary for antipsychotic drugs to reverse D-amphetamine disruption of latent inhibition (LI), a behavioural measure of learning to ignore irrelevant stimuli. Weiner's 'two-headed' model indicates that antipsychotics not only reverse LI disruption, 'disrupted LI', but also potentiate LI when low/absent in controls, 'persistent' LI. We investigated whether antipsychotic drugs haloperidol or clozapine potentiated LI in wild-type controls or Drd2 -/-. Both drugs potentiated LI in wild-type but not in Drd2 -/- mice, suggesting moderation of this effect of antipsychotics in the absence of Drd-2. Haloperidol potentiated LI similarly in both Drd1 -/- and wild-type mice, indicating no such moderation in Drd1 -/-. These data suggest that antipsychotic drugs can have either Drd-2 or non-Drd-2 effects on learning to ignore irrelevant stimuli, depending on how the abnormality is produced. Identification of the non-Drd-2 mechanism may help to identify novel non-Drd2 based therapeutic strategies for psychosis.

Item Type: Article
RIS ID: https://nottingham-repository.worktribe.com/output/734791
Keywords: Antipsychotics; Drd-2 knockout mice; Latent inhibition; Haloperidol; Clozapine
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Pharmacy
University of Nottingham, UK > Faculty of Science > School of Psychology
Identification Number: https://doi.org/10.1177/0269881114544774
Depositing User: Heery, David
Date Deposited: 12 Jul 2018 10:51
Last Modified: 04 May 2020 16:53
URI: https://eprints.nottingham.ac.uk/id/eprint/52889

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