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Subtype-selective nicotinic agonists enhance olfactory working memory in normal rats: A novel use of the odour span task

Lookup NU author(s): Samantha Rushforth, Dr Claire Allison, Dr Mohammed Shoaib

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Abstract

Nicotinic agonists have been shown to enhance performance in cognitive tasks based on attention and memory. The aim of this study was to use a test of olfactory working memory: the odour span task (OST) in rodents, to investigate the effects of subtype-specific nicotinic agonists on working memory in normal rats. Rats were trained in a non-matching to sample (NMTS) rule and then the full OST, which involved identifying a novel odour from an increasing number of presented odours. Male hooded Lister rats were treated with nicotine, selective nicotinic agonists or vehicle (saline). In order to validate the task, muscarinic and nicotinic receptor antagonists were also examined. Nicotine at both 0.05 and 0.1 mg/kg significantly increased mean span length in the OST. The selective alpha 4 beta 2 nicotinic receptor agonist metanicotine (0.1 mg/kgs.c.) and the selective alpha 7 nicotinic receptor agonist (R)-N-(1-azabicyclo[2.2.2]oct-3-yl)(5-(2-pyridyl)thiophene-2-carboxamide) (compound A, 10 mg/kg i.p.) also improved performance. In contrast, mecamylamine and scopolamine significantly decreased mean span length. These findings suggest a role for the activation of both alpha 4 beta 2 and alpha 7 subtypes of neuronal nicotinic receptor in mediating enhancements of olfactory working memory capacity in normal, non-compromised rats. These nicotinic receptor subtypes may therefore prove to be useful targets for the development of novel treatments for neuropsychiatric disorders that involve cognitive dysfunction. (C) 2010 Elsevier Ireland Ltd. All rights reserved.

Publication metadata

Author(s): Rushforth SL, Allison C, Wonnacott S, Shoaib M

Publication type: Article

Publication status: Published

Journal: Neuroscience Letters

Year: 2010

Volume: 471

Issue: 2

Pages: 114-118

Print publication date: 01/03/2010

ISSN (print): 0304-3940

ISSN (electronic): 1872-7972

Publisher: Elsevier Ireland Ltd

URL: http://dx.doi.org/10.1016/j.neulet.2010.01.022

DOI: 10.1016/j.neulet.2010.01.022

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