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01-11-2017 | Short Communication

The excitatory/inhibitory input to orexin/hypocretin neuron soma undergoes day/night reorganization

Authors: Claudia Laperchia, Roberta Imperatore, Idris A. Azeez, Federico Del Gallo, Giuseppe Bertini, Gigliola Grassi-Zucconi, Luigia Cristino, Marina Bentivoglio

Published in: Brain Structure and Function | Issue 8/2017

Abstract

Orexin (OX)/hypocretin-containing neurons are main regulators of wakefulness stability, arousal, and energy homeostasis. Their activity varies in relation to the animal’s behavioral state. We here tested whether such variation is subserved by synaptic plasticity phenomena in basal conditions. Mice were sacrificed during day or night, at times when sleep or wake, respectively, predominates, as assessed by electroencephalography in matched mice. Triple immunofluorescence was used to visualize OX-A perikarya and varicosities containing the vesicular glutamate transporter (VGluT)2 or the vesicular GABA transporter (VGAT) combined with synaptophysin (Syn) as a presynaptic marker. Appositions on OX-A⁺ somata were quantitatively analyzed in pairs of sections in epifluorescence and confocal microscopy. The combined total number of glutamatergic (Syn⁺/VGluT2⁺) and GABAergic (Syn⁺/VGAT⁺) varicosities apposed to OX-A somata was similar during day and night. However, glutamatergic varicosities were significantly more numerous at night, whereas GABAergic varicosities prevailed in the day. Triple immunofluorescence in confocal microscopy was employed to visualize synapse scaffold proteins as postsynaptic markers and confirmed the nighttime prevalence of VGluT2⁺ together with postsynaptic density protein 95⁺ excitatory contacts, and daytime prevalence of VGAT⁺ together with gephyrin⁺ inhibitory contacts, while also showing that they formed synapses on OX-A⁺ cell bodies. The findings reveal a daily reorganization of axosomatic synapses in orexinergic neurons, with a switch from a prevalence of excitatory innervation at a time corresponding to wakefulness to a prevalence of inhibitory innervations in the antiphase, at a time corresponding to sleep. This reorganization could represent a key mechanism of plasticity of the orexinergic network in basal conditions.

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Title: The excitatory/inhibitory input to orexin/hypocretin neuron soma undergoes day/night reorganization
Authors: Claudia Laperchia
Roberta Imperatore
Idris A. Azeez
Federico Del Gallo
Giuseppe Bertini
Gigliola Grassi-Zucconi
Luigia Cristino
Marina Bentivoglio
Publication date: 01-11-2017
Publisher: Springer Berlin Heidelberg
Published in: Brain Structure and Function / Issue 8/2017
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI: https://doi.org/10.1007/s00429-017-1466-3

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The excitatory/inhibitory input to orexin/hypocretin neuron soma undergoes day/night reorganization

Abstract

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Abstract

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