NDLI: Aging differentially affects the re-entrainment response of central and peripheral circadian oscillators

Content Provider	PubMed Central
Author	Sellix, Michael T. Evans, Jennifer A. Leise, Tanya L. Oscar, Castanon-cervantes Hill, Dijon D. Delisser, Patrick Block, Gene D. Menaker, Michael Davidson, Alec J.
Abstract	Aging produces a decline in the amplitude and precision of 24h behavioral, endocrine, and metabolic rhythms, which are regulated in mammals by a central circadian pacemaker within the suprachiasmatic nucleus (SCN) and local oscillators in peripheral tissues. Disruption of the circadian system, as experienced during transmeridian travel, can lead to adverse health consequences, particularly in the elderly. To test the hypothesis that age-related changes in the response to simulated jetlag will reflect altered circadian function, we examined re-entrainment of central and peripheral oscillators from young and old PER2::luciferase mice. As in previous studies, locomotor activity rhythms in older mice required more days to re-entrain following a shift than younger mice. At the tissue level, effects of age on baseline entrainment were evident, with older mice displaying earlier phases for the majority of peripheral oscillators studied and later phases for cells within most SCN subregions. Following a 6h advance of the light:dark cycle, old mice displayed slower rates of re-entrainment for peripheral tissues but a larger, more rapid SCN response compared to younger mice. Thus, aging alters the circadian timing system in a manner that differentially affects the re-entrainment responses of central and peripheral circadian clocks. This pattern of results suggests that a major consequence of aging is a decrease in pacemaker amplitude, which would slow re-entrainment of peripheral oscillators and reduce SCN resistance to external perturbation.
Related Links	http://dx.doi.org/10.1523/jneurosci.3559-12.2012
Ending Page	16202
Page Count	10
Starting Page	16193
File Format	PDF
ISSN	02706474
e-ISSN	15292401
Journal	The Journal of neuroscience : the official journal of the Society for Neuroscience
Issue Number	46
Volume Number	32
Language	English
Publisher Date	2012-11-14
Access Restriction	Open
Subject Keyword	Neuroscience(all) Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Neuroscience

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