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Neurobiol Aging. 2014 Mar;35(3):680-91. doi: 10.1016/j.neurobiolaging.2013.08.034. Epub 2013 Oct 8.

Alteration of olfactory perceptual learning and its cellular basis in aged mice.

Author information

  • 1INSERM, U1028; CNRS, UMR5292; Lyon 1 University, Lyon Neuroscience Research Center, Lyon, France.

Abstract

Olfactory perceptual learning reflects an ongoing process by which animals learn to discriminate odorants thanks to repeated stimulations by these odorants. Adult neurogenesis is required for this learning to occur in young adults. The experiments reported here showed that olfactory perceptual learning is impaired with aging and that this impairment is associated with a reduction of neurogenesis and a decrease in granule cell responsiveness to the learned odorant in the olfactory bulb. Interestingly, we showed that the pharmacological stimulation of the noradrenergic system using dexefaroxan mimics olfactory perceptual learning in old mice, which is accompanied by an increase of granule cell responsiveness in response to the learned odorant without any improvement in neurogenesis. We provide the first published evidence that, in contrast to young adult mice, the improvement of olfactory performances in old mice is independent of the overall level of neurogenesis. In addition, restoring behavioral performances in old mice by stimulation of the noradrenergic system underlies the importance of this neuromodulatory system in regulating bulbar network plasticity.

Copyright © 2014 Elsevier Inc. All rights reserved.

KEYWORDS:

Behavior; Discrimination; Noradrenaline; Normal aging; Olfactory bulb; Zif268

PMID:
24112795
[PubMed - in process]
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