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The effects of dietary iron deprivation on murine circadian sleep architecture.

Abstract：

OBJECTIVES:Iron deficiency is considered a putative cause for restless legs syndrome (RLS), a human sensorimotor disorder characterized by a circadian presentation of symptoms during the evening hours that disrupts one's ability to sleep. We sought to evaluate the sleep-wake effects of diet-induced iron deficiency in mice as an animal model of RLS. To this end, we hypothesized that the iron-deprived mice would exhibit a sleep-wake circadian pattern characteristic of the human syndrome: increased wakefulness during the hours immediately preceding the sleep-predominant period. METHODS:Following weaning at post-natal day (PND) 21, C57BL/6J mice were assigned to one of two dietary treatments: iron-deficient (ID, n=7) or iron-adequate (i.e., control, CTL, n=6). At PND 44, the mice were surgically instrumented for polysomnographic (PSG) recording, and data were collected at young adulthood: PNDs 59 and 60. Sleep-wake architecture was characterized for the 12-h light and dark periods and also for six consecutive 4-h blocks comprising a 24-h day. RESULTS:The ID mice showed marked increases in wake time in the 4-h period prior to lights-on; both non-rapid eye movement (NREM) and rapid eye movement (REM) sleep were reduced. In contrast, sleep-wake activity did not differ across the 12-h light period. CONCLUSIONS:Dietary iron deficiency in mice elicited increases in wakefulness during a particular circadian time point that corresponds to the period during which RLS symptoms would maximally disturb sleep onset and progression in humans. These data indicate that iron-deficient mice may provide a potentially useful animal model for RLS.

journal_name

Sleep Med

journal_title

Sleep medicine

authors

Dean T Jr,Allen RP,O'Donnell CP,Earley CJ

doi

10.1016/j.sleep.2006.07.002

subject

Has Abstract

pub_date

2006-12-01 00:00:00

pages

634-40

issue

8

eissn

1389-9457

issn

1878-5506

pii

S1389-9457(06)00223-1

journal_volume

7

pub_type

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