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01-09-2015 | Original Article

Localisation and stress-induced plasticity of GABA_A receptor subunits within the cellular networks of the mouse dorsal raphe nucleus

Authors: Nicole L. Corteen, Jessica A. Carter, Uwe Rudolph, Delia Belelli, Jeremy J. Lambert, Jerome D. Swinny

Published in: Brain Structure and Function | Issue 5/2015

Abstract

The dorsal raphe nucleus (DRN) provides the major source of serotonin to the central nervous system (CNS) and modulates diverse neural functions including mood. Furthermore, DRN cellular networks are engaged in the stress–response at the CNS level allowing for adaptive behavioural responses, whilst stress-induced dysregulation of DRN and serotonin release is implicated in psychiatric disorders. Therefore, identifying the molecules regulating DRN activity is fundamental to understand DRN function in health and disease. GABA_A receptors (GABA_ARs) allow for brain region, cell type and subcellular domain-specific GABA-mediated inhibitory currents and are thus key regulators of neuronal activity. Yet, the GABA_AR subtypes expressed within the neurochemically diverse cell types of the mouse DRN are poorly described. In this study, immunohistochemistry and confocal microscopy revealed that all serotonergic neurons expressed immunoreactivity for the GABA_AR alpha2 and 3 subunits, although the respective signals were co-localised to varying degrees with inhibitory synaptic marker proteins. Only a topographically located sub-population of serotonergic neurons exhibited GABA_AR alpha1 subunit immunoreactivity. However, all GABAergic as well as non-GABAergic, non-serotonergic neurons within the DRN expressed GABA_AR alpha1 subunit immunoreactivity. Intriguingly, immunoreactivity for the GABA_AR gamma2 subunit was enriched on GABAergic rather than serotonergic neurons. Finally, repeated restraint stress increased the expression of the GABA_AR alpha3 subunit at the mRNA and protein level. The study demonstrates the identity and location of distinct GABA_AR subunits within the cellular networks of the mouse DRN and that stress impacts on the expression levels of particular subunits at the gene and protein level.

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Title: Localisation and stress-induced plasticity of GABAA receptor subunits within the cellular networks of the mouse dorsal raphe nucleus
Authors: Nicole L. Corteen
Jessica A. Carter
Uwe Rudolph
Delia Belelli
Jeremy J. Lambert
Jerome D. Swinny
Publication date: 01-09-2015
Publisher: Springer Berlin Heidelberg
Published in: Brain Structure and Function / Issue 5/2015
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI: https://doi.org/10.1007/s00429-014-0824-7

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Localisation and stress-induced plasticity of GABA_A receptor subunits within the cellular networks of the mouse dorsal raphe nucleus

Abstract

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Abstract

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