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Disruption of circadian rhythms: a crucial factor in the etiology of depression.

Abstract
Circadian factors might play a crucial role in the etiology of depression. It has been demonstrated that the disruption of circadian rhythms by lighting conditions and lifestyle predisposes individuals to a wide range of mood disorders, including impulsivity, mania and depression. Also, associated with depression, there is the impairment of circadian rhythmicity of behavioral, endocrine, and metabolic functions. Inspite of this close relationship between both processes, the complex relationship between the biological clock and the incidence of depressive symptoms is far from being understood. The efficiency and the timing of treatments based on chronotherapy (e.g., light treatment, sleep deprivation, and scheduled medication) indicate that the circadian system is an essential target in the therapy of depression. The aim of the present review is to analyze the biological and clinical data that link depression with the disruption of circadian rhythms, emphasizing the contribution of circadian desynchrony. Therefore, we examine the conditions that may lead to circadian disruption of physiology and behavior as described in depressive states, and, according to this approach, we discuss therapeutic strategies aimed at treating the circadian system and depression.
AuthorsRoberto Salgado-Delgado, Araceli Tapia Osorio, Nadia Saderi, Carolina Escobar
JournalDepression research and treatment (Depress Res Treat) Vol. 2011 Pg. 839743 ( 2011) ISSN: 2090-133X [Electronic] United States
PMID21845223 (Publication Type: Journal Article)

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