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Previous Article | Next Article
The Journal of Neuroscience, December 15, 2000, 20(24):9326-9332
Circadian Clock Resetting by Sleep Deprivation without Exercise in the Syrian Hamster
M. C. Antle and R. E. Mistlberger Department of Psychology, Simon Fraser University, Burnaby, British Columbia, V5A 1S6 Canada
Circadian rhythms in several species can be phase-shifted by procedures that stimulate locomotor activity ("exercise") during the usual sleep period. The role of arousal or sleep loss, independent of activity, in this effect has not been adequately resolved. We show here, using the sleep deprivation procedure of gentle handling, that comparably large phase shifts (up to 240 min advances) of the rest-activity cycle can be induced in Syrian hamsters by 3 hr of behavioral arousal, with minimal locomotion, beginning 6 hr before the usual active period. Horizontal distance traveled during the deprivation procedure averaged ~0.08 km, compared to 2.5 km typical in exercise studies. Hamsters requiring fewer interventions exhibited larger shifts, suggesting that the level or continuity of spontaneous arousal determines shift size. The circadian rhythm of light-induced c-fos expression in the suprachiasmatic nucleus (SCN) was used as a phase marker to further demonstrate that the clock is reset within 1 hr after a 3 hr deprivation. Sleep deprivation mimicked the effects of exercise on basal c-fos expression in two components of the circadian system, suppressing basal Fos immunoreactivity in the SCN, and increasing Fos in the intergeniculate leaflet. Sleep deprivation without exercise in hamsters can rapidly reset the circadian clock and alter gene expression within the circadian system.
Key words: circadian rhythms; nonphotic entrainment; c-fos; wheel running; phase shifts; suprachiasmatic nucleus
Copyright © 2000 Society for Neuroscience 0270-6474/00/20249326-07$05.00/0
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