Aging alters circadian and light-induced expression of clock genes in golden hamsters.

Abstract:

:Aging alters numerous aspects of circadian biology, including the amplitude of rhythms generated by the suprachiasmatic nuclei (SCN) of the hypothalamus, the site of the central circadian pacemaker in mammals, and the response of the pacemaker to environmental stimuli such as light. Although previous studies have described molecular correlates of these behavioral changes, to date only 1 study in rats has attempted to determine if there are age-related changes in the expression of genes that comprise the circadian clock itself. We used in situ hybridization to examine the effects of age on the circadian pattern of expression of a subset of the genes that comprise the molecular machinery of the circadian clock in golden hamsters. Here we report that age alters the 24-h expression profile of Clock and its binding partner Bmal1 in the hamster SCN. There is no effect of age on the 24-h profile of either Per1 or Per2 when hamsters are housed in constant darkness. We also found that light pulses, which induce smaller phase shifts in old animals than in young, lead to decreased induction of Per1, but not of Per2, in the SCN of old hamsters.

journal_name

J Biol Rhythms

authors

Kolker DE,Fukuyama H,Huang DS,Takahashi JS,Horton TH,Turek FW

doi

10.1177/0748730403251802

subject

Has Abstract

pub_date

2003-04-01 00:00:00

pages

159-69

issue

2

eissn

0748-7304

issn

1552-4531

journal_volume

18

pub_type

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