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

NEUROSCIENCE LETTERS

卷:644

Article

Vadodaria, Krishna C.¹  Yanpallewar, Sudhirkumar U.¹  Vadhvani, Mayur¹  Toshniwal, Devyani¹  Liles, L. Cameron²  Rommelfanger, Karen S.²  Weinshenker, David²  Vaidya, Vidita A.¹ 

[1] Tata Inst Fundamental Res, Dept Biol Sci, Bombay 400005, Maharashtra, India

[2] Emory Univ, Sch Med, Dept Human Genet, Atlanta, GA 30322 USA

关键词: DCX;    Neurogenesis;    Norepinephrine;    Nestin;    PSA-NCAM;    alpha(2)-Adrenergic receptor;    DSP-4;    Doublecortin;    Dbh;   

DOI  :  10.1016/j.neulet.2017.02.060

来源: Elsevier

【 摘 要 】

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 beta-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 alpha(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 alpha(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. (C) 2017 Elsevier B.V. All rights reserved.

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