, Volume 193, Issue 1, pp 63-73
Date: 24 Mar 2007

Improvement of episodic contextual memory by S 18986 in middle-aged mice: comparison with donepezil

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Abstract

Introduction

This study compared the effects of S 18986, a positive allosteric modulator of alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA)-type glutamate receptors, to those of donepezil a cholinesterase inhibitor on memory impairments induced by ageing in a contextual serial discrimination (CSD) task in middle-aged mice.

Materials and methods

The CSD task involved the learning of two consecutive discriminations in a four-hole board, each performed on two different floors. This model has been developed to study simultaneously different forms of memory in mice (i.e., episodic-like vs semantic-like forms of memory). We showed that placebo-middle-aged mice (14–15 months old) and placebo-aged subjects (19–20 months old) exhibited a severe memory deficit for the first but not the second discrimination, which was due to an increase in interference, as compared with placebo-treated young mice (5 months old). Middle-aged mice were given (9 days) per os administration of either donepezil, S 18986, or placebo.

Results and discussion

Both 0.3 mg/kg donepezil and 0.1 mg/kg S 18986 reversed the deficit of middle-aged mice through a significant increase in contextually correct responses and in parallel a tendency to reduce interfering responses.

Conclusion

Overall, S 18986 emerges as having a beneficial impact on contextual memory processes in middle-aged mice.