Document Detail

Daily torpor in the absence of the suprachiasmatic nucleus in Siberian hamsters.
MedLine Citation:
PMID:  1510174     Owner:  NLM     Status:  MEDLINE    
Siberian hamsters express torpor spontaneously after several weeks of exposure to short days. In long days, torpor is expressed only when food intake is restricted. Hamsters maintained in a long photoperiod (16 h light/day) at 15 degrees C expressed daily torpor during food restriction both before and after bilateral ablation of the suprachiasmatic nucleus (SCN). Hamsters housed in short days (8 h light/day, ambient temperature 15 degrees C) and fed ad libitum displayed torpor before, but not after, ablation of the SCN (SCNX). Torpor was reinstated in all short-day SCNX hamsters during postoperative food restriction and persisted in several animals even after ad libitum feeding was reinstated. Torpor was entrained to the light-dark cycle in both long- and short-day hamsters preoperatively but appeared to occur in a temporally random fashion in SCNX animals. SCNX hamsters, unlike control animals, displayed multiple torpor bouts per 24 h. The SCN is not essential for the expression of torpor but plays a crucial role in its temporal organization.
N F Ruby; I Zucker
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of physiology     Volume:  263     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1992 Aug 
Date Detail:
Created Date:  1992-09-22     Completed Date:  1992-09-22     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  R353-62     Citation Subset:  IM    
Department of Psychology, University of California, Berkeley 94720.
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MeSH Terms
Body Temperature
Body Weight
Circadian Rhythm
Energy Metabolism*
Food Deprivation
Motor Activity
Suprachiasmatic Nucleus / physiology*
Grant Support

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