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Published in: Journal of Neural Transmission 10/2012

01-10-2012 | Biological Psychiatry - Review article

Circadian entrainment and its role in depression: a mechanistic review

Authors: G. S. Lall, L. A. Atkinson, S. A. Corlett, P. J. Broadbridge, D. R. Bonsall

Published in: Journal of Neural Transmission | Issue 10/2012

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Abstract

The natural rotation of the earth generates an environmental day–night cycle that repeats every 24 h. This daily transition from dawn to dusk provides one of the most important time cues to which the majority of organisms synchronise their activity. Under these conditions, natural light, a photic stimulus, provides the principal entraining cue. In mammals, an endogenous circadian pacemaker located within the suprachiasmatic nucleus (SCN) of the hypothalamus acts as a coordinating centre to align physiological activity with the environmental light–dark cycle. However, the SCN also receives regulatory input from a number of behavioural, non-photic, cues such as physical activity, social interactions and feeding routines. The unique ability of the SCN to integrate both photic and non-photic cues allows it to generate a rhythm that is tailored to the individual and entrained to the environment. Here, we review the key neurotransmitter systems involved in both photic and non-photic transmission to the SCN and their interactions that assist in generating an entrained output rhythm. We also consider the impact on health of a desynchronised circadian system with a focus on depressive affective disorders and current therapies aimed at manipulating the relationship between photic and non-photic SCN regulators.
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Metadata
Title
Circadian entrainment and its role in depression: a mechanistic review
Authors
G. S. Lall
L. A. Atkinson
S. A. Corlett
P. J. Broadbridge
D. R. Bonsall
Publication date
01-10-2012
Publisher
Springer Vienna
Published in
Journal of Neural Transmission / Issue 10/2012
Print ISSN: 0300-9564
Electronic ISSN: 1435-1463
DOI
https://doi.org/10.1007/s00702-012-0858-z

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