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Author Notes:

Dr. Vidita A. Vaidya, Department of Biological Sciences, Tata Institute of Fundamental Research, Mumbai 400005, India, Tel #: + 91 22 22782608, Fax #: +91 22 22804610/+ 91 22 22804611, vvaidya@tifr.res.in

We are grateful to Professor T. Seki, Juntendo University School of Medicine, Tokyo, for the gift of the PSA-NCAM antibody.

We are grateful to Prof. Steven Kernie, Columbia University for the gift of the Nestin-GFP mice.

We thank Dainippon-Sumitomo Pharma Co. Ltd. (Osaka, Japan) for their generous donation of DOPS used to breed the Dbh −/− mice.

Subject:

Research Funding:

This work was supported by intramural funds from TIFR.

Keywords:

  • Science & Technology
  • Life Sciences & Biomedicine
  • Neurosciences
  • Neurosciences & Neurology
  • DCX
  • Neurogenesis
  • Norepinephrine
  • Nestin
  • PSA-NCAM
  • alpha(2)-Adrenergic receptor
  • DSP-4
  • Doublecortin
  • Dbh
  • PSA-NCAM EXPRESSION
  • STRUCTURAL PLASTICITY
  • RAT TELENCEPHALON
  • PYRAMIDAL NEURONS
  • IMMATURE NEURONS
  • LOCUS-COERULEUS
  • MICE
  • NOREPINEPHRINE
  • NEUROGENESIS
  • CATECHOLAMINES

Noradrenergic regulation of plasticity marker expression in the adult rodent piriform cortex

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Journal Title:

Neuroscience Letters

Volume:

Volume 644

Publisher:

, Pages 76-82

Type of Work:

Article | Post-print: After Peer Review

Abstract:

The adult rodent piriform cortex has been reported to harbor immature neurons that express markers associated with neurodevelopment and plasticity, namely polysialylated neural cell adhesion molecule (PSA-NCAM) and doublecortin (DCX). We characterized the expression of PSA-NCAM and DCX across the rostrocaudal axis of the rat piriform cortex and observed higher numbers of PSA-NCAM and DCX positive cells in the posterior subdivision. As observed in the rat piriform cortex, Nestin-GFP reporter mice also revealed a similar gradient of GFP-positive cells with an increasing rostro-caudal gradient of expression. Given the extensive noradrenergic innervation of the piriform cortex and its role in regulating piriform cortex function and synaptic plasticity, we addressed the influence of norepinephrine (NE) on piriform cortex plasticity marker expression. Depletion of NE by treatment with the noradrenergic neurotoxin DSP-4 significantly increased the number of DCX and PSA-NCAM immunopositive cells in the piriform cortex of adult rats. Similarly, DSP-4 treated Nestin-GFP reporter mice revealed a robust induction of GFP-positive cells within the piriform cortex following NE depletion. Genetic loss of NE in dopamine β-hydroxylase knockout (Dbh −/−) mice phenocopied the effects of DSP-4, with an increase noted in PSA-NCAM and DCX positive cells in the piriform cortex. Further, chronic α 2 -adrenergic receptor stimulation with the agonist guanabenz increased PSA-NCAM and DCX positive cells in the piriform cortex of adult rats and GFP-positive cells in the piriform cortex of Nestin-GFP mice. By contrast, chronic α 2 -adrenergic receptor blockade with the antagonist yohimbine reduced PSA-NCAM and DCX positive cells in the piriform cortex of adult rats. Our results provide novel evidence for a role of NE in regulating the expression of plasticity markers, including PSA-NCAM, DCX, and nestin, within the adult mouse and rat piriform cortex.

Copyright information:

© 2017 Elsevier B.V. All rights reserved.

This is an Open Access work distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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