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Dopamine D1 receptor involvement in latent inhibition and overshadowing

Nelson, Andrew J.D.; Thur, Karen E.; Cassaday, Helen J.

Dopamine D1 receptor involvement in latent inhibition and overshadowing Thumbnail


Authors

Andrew J.D. Nelson

Karen E. Thur

Helen J. Cassaday



Abstract

Latent inhibition (LI) manifests as poorer conditioning to a stimulus that has previously been experienced
without consequence. There is good evidence of dopaminergic modulation of LI, as the e?ect is reliably
disrupted by the indirect dopamine (DA) agonist amphetamine. The disruptive e?ects of amphetamine on
LI are reversed by both typical and atypical antipsychotics, which on their own are able to facilitate LI.
However, the contribution of di?erent DA receptors to these e?ects is poorly understood. Amphetamine
e?ects on another stimulus selection procedure, overshadowing, have been suggested to be D1-mediated.
Thus, in the current experiments, we systematically investigated the role of D1 receptors in LI. First, we
tested the ability of the full D1 agonist SKF 81297 to abolish LI and compared the e?ects of this drug on LI
and overshadowing. Subsequently, we examined whether the D1 antagonist SCH 23390 can lead to the emergence of LI under conditions that do not produce the e?ect in normal animals (weak pre-exposure).
Finally, we tested the ability of SCH 23390 to block amphetamine-induced disruption of LI. We found little
evidence that direct stimulation of D1 receptors abolishes LI (although there was some attenuation of LI
at 0.4 mg/kg SKF 81297). Similarly, SCH 23390 failed to enhance LI. However, SCH 23390 did block
amphetamine-induced disruption of LI. These data indicate that, while LI may be una?ected by selective
manipulation of activity at D1 receptors, the e?ects of amphetamine on LI are to some extent dependent on actions at D1 receptors.

Journal Article Type Article
Publication Date Nov 1, 2012
Deposit Date Apr 17, 2014
Publicly Available Date Apr 17, 2014
Journal International Journal of Neuropsychopharmacology
Print ISSN 1461-1457
Electronic ISSN 1461-1457
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 15
Issue 10
DOI https://doi.org/10.1017/S1461145711001751
Public URL https://nottingham-repository.worktribe.com/output/1006345
Publisher URL http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8704773&fulltextType=RA&fileId=S1461145711001751

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