Document Detail

Feeding-induced rapid resetting of the hepatic circadian clock is associated with acute induction of Per2 and Dec1 transcription in rats.
MedLine Citation:
PMID:  20205554     Owner:  NLM     Status:  MEDLINE    
The synchronization of the master clock to photic cues is associated with a rapid induction of Per1, which plays an important role in initiating light-induced circadian resetting. However, the transcriptional mechanisms of clock gene expression in food-entrainable peripheral clocks have not been fully assessed. To understand how food cues might entrain a mammalian peripheral clock, we examined the responses in the expression of clock genes in rat livers to different feeding stimuli. The food-entrainable liver clock is more flexible than the light-entrainable SCN clock and can be reset rapidly at any time of day. A 30 min feeding stimulus was sufficient to significantly induce the expression of Per2 and Dec1 within 1 h and alter the transcript levels and circadian phases of other selected clock genes (Bmal1, Cry1, Per1, Per3, Dec2, and Rev-erba) in the liver clock at longer time intervals. Moreover, among the examined clock genes, Per2 was most sensitive to food cues, which could be significantly induced by a minimal amount of food. Furthermore, in contrast to the other hepatic clock genes, the feeding reversal-induced 12 h phase shift of Per2 could be rapidly and consistently accomplished, regardless of the shift of the light/dark cycle. In conclusion, the feeding-induced resetting of the circadian clock in the liver is associated with the acute induction of Per2 and Dec1 transcription, which may serve as the main and secondary input regulators that initiate this feeding-induced circadian resetting.
Tao Wu; Yinhua Ni; Hisanori Kato; Zhengwei Fu
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Chronobiology international     Volume:  27     ISSN:  1525-6073     ISO Abbreviation:  Chronobiol. Int.     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2010-03-08     Completed Date:  2010-05-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8501362     Medline TA:  Chronobiol Int     Country:  England    
Other Details:
Languages:  eng     Pagination:  1-18     Citation Subset:  IM    
College of Biological and Environmental Engineering, Zhejiang University of Technology, Zhejiang 310032, China.
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MeSH Terms
Base Sequence
Basic Helix-Loop-Helix Transcription Factors / genetics*
Circadian Rhythm / genetics*,  physiology*
DNA Primers / genetics
Eating / genetics,  physiology
Gene Expression
Homeodomain Proteins / genetics*
Liver / physiology*
Period Circadian Proteins / genetics*
Rats, Wistar
Transcription, Genetic
Reg. No./Substance:
0/Basic Helix-Loop-Helix Transcription Factors; 0/Bhlhb2 protein, rat; 0/DNA Primers; 0/Homeodomain Proteins; 0/Per2 protein, rat; 0/Period Circadian Proteins

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