Document Detail

Effect of unilateral surgical denervation of brown adipose tissue on uncoupling protein mRNA level and cytochrom-c-oxidase activity in the Djungarian hamster.
MedLine Citation:
PMID:  8195470     Owner:  NLM     Status:  MEDLINE    
The bilateral lobe of interscapular brown adipose tissue of the Djungarian hamster was unilaterally denervated in order to study the role of the sympathetic innervation for maintenance and cold-induced increase of non-shivering thermogenesis. Denervation decreased the noradrenaline content of brown adipose tissue to less than 9% of the intact contralateral pad. This low noradrenaline level was maintained for 1-14 days after denervation. First, to study the role of the sympathetic innervation of brown adipose tissue in the maintenance of the high thermogenic capacity characteristic of the cold acclimated state, brown adipose tissue was denervated in hamsters either kept at thermoneutrality or acclimated to 5 degrees C ambient temperature for 4 weeks. Cold-acclimated hamsters had elevated levels of uncoupling protein messenger ribonucleic acid (8.1-fold) and cytochrom-c oxidase-activity (3-fold). Denervation of brown adipose tissue decreased uncoupling protein-messenger ribonucleic acid level and cytochrom-c-oxidase-activity as compared to the intact pad in thermoneutral and in cold-acclimated hamsters. However, in cold-acclimated hamsters uncoupling protein-messenger ribonucleic acid level and cytochrom-c-oxidase-activity in denervated brown adipose tissue both were maintained on an elevated 6-fold higher level as compared to thermoneutral controls. Second, to study the role of the sympathetic innervation of brown adipose tissue in the cold-induced increase in thermogenic capacity, hamsters were denervated prior to cold acclimation and responses were measured after 3 and 14 days of cold exposure. Uncoupling protein-messenger ribonucleic acid level and cytochrom-c-oxidase-activity of intact brown adipose tissue increased after 14 days cold acclimation.(ABSTRACT TRUNCATED AT 250 WORDS)
M Klingenspor; A Meywirth; S Stöhr; G Heldmaier
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology     Volume:  163     ISSN:  0174-1578     ISO Abbreviation:  J. Comp. Physiol. B, Biochem. Syst. Environ. Physiol.     Publication Date:  1994  
Date Detail:
Created Date:  1994-06-24     Completed Date:  1994-06-24     Revised Date:  2009-06-08    
Medline Journal Info:
Nlm Unique ID:  8413200     Medline TA:  J Comp Physiol B     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  664-70     Citation Subset:  IM    
Philipps-Universität Marburg, Department of Zoology, Germany.
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MeSH Terms
Adipose Tissue, Brown / innervation*,  physiology,  surgery*
Carrier Proteins / genetics*
Cold Temperature
Electron Transport Complex IV / metabolism*
Ion Channels
Membrane Proteins / genetics*
Mitochondria / metabolism
Mitochondrial Proteins
Norepinephrine / metabolism
Phodopus / physiology*
RNA, Messenger / metabolism*
Reg. No./Substance:
0/Carrier Proteins; 0/Ion Channels; 0/Membrane Proteins; 0/Mitochondrial Proteins; 0/RNA, Messenger; 0/mitochondrial uncoupling protein; 51-41-2/Norepinephrine; EC Transport Complex IV

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