The Dynamics of GABA Signaling: Revelations from the Circadian Pacemaker in the Suprachiasmatic Nucleus

Overview

Journal Front Neuroendocrinol

Specialty Endocrinology

Date 2016 Nov 30

PMID 27894927

Citations 49

Authors

H Elliott Albers

James C Walton

Karen L Gamble

John K McNeill 4th

Daniel L Hummer

Affiliations

Soon will be listed here.

Abstract

Virtually every neuron within the suprachiasmatic nucleus (SCN) communicates via GABAergic signaling. The extracellular levels of GABA within the SCN are determined by a complex interaction of synthesis and transport, as well as synaptic and non-synaptic release. The response to GABA is mediated by GABA receptors that respond to both phasic and tonic GABA release and that can produce excitatory as well as inhibitory cellular responses. GABA also influences circadian control through the exclusively inhibitory effects of GABA receptors. Both GABA and neuropeptide signaling occur within the SCN, although the functional consequences of the interactions of these signals are not well understood. This review considers the role of GABA in the circadian pacemaker, in the mechanisms responsible for the generation of circadian rhythms, in the ability of non-photic stimuli to reset the phase of the pacemaker, and in the ability of the day-night cycle to entrain the pacemaker.

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