Document Detail


Radioisotopic method for the measurement of lipolysis in small samples of human adipose tissue.
MedLine Citation:
PMID:  6368714     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To facilitate the study of adrenoreceptor response in small needle biopsy samples of human subcutaneous adipose tissue, we developed a dual radioisotopic technique for measuring lipolysis rate. Aliquots (20-75 mg) of adipose tissue fragments were incubated in a buffered albumin medium containing [3H]palmitate and [14C]glucose, each of high specific activity. In neutral glycerides synthesized in this system, [14C]glucose is incorporated exclusively into the glyceride-glycerol moiety and 3H appears solely in the esterified fatty acid. Alpha-2 and beta-1 adrenoreceptor activation of tissue incubated in this system does not alter rates of 14C-labeled glyceride accumulation, but does produce a respective increase or decrease in the specific activity of fatty acids esterified into newly synthesized glycerides. This alteration in esterified fatty acid specific activity is reflected in the ratio of 14C:3H in newly synthesized triglycerides extracted from the incubated adipose tissue. There is a high correlation (r = 0.90) between the 14C:3H ratio in triglycerides and the rate of lipolysis as reflected in glycerol release into the incubation medium. The degree of adrenoreceptor activation by various concentrations of lipolytic and anti-lipolytic substances can be assessed by comparing this ratio in stimulated tissue to that characterizing unstimulated tissue or the incubation medium. This technique permits the study of very small, unweighed tissue biopsy fragments, the only limitation on sensitivity being the specific activity of the medium glucose and palmitate. It is, therefore, useful for serial examinations of adipose tissue adrenoreceptor dose-response characteristics under a variety of clinical circumstances.
Authors:
R L Leibel; J Hirsch; E M Berry; R K Gruen
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of lipid research     Volume:  25     ISSN:  0022-2275     ISO Abbreviation:  J. Lipid Res.     Publication Date:  1984 Jan 
Date Detail:
Created Date:  1984-05-11     Completed Date:  1984-05-11     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0376606     Medline TA:  J Lipid Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  49-57     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adipose Tissue / metabolism*
Carbon Radioisotopes / diagnostic use
Female
Glucose / metabolism*
Humans
Kinetics
Lipolysis*
Obesity / metabolism
Palmitic Acid
Palmitic Acids / metabolism*
Radioisotope Dilution Technique
Tritium / diagnostic use
Grant Support
ID/Acronym/Agency:
5FO5 TWO2918-02/TW/FIC NIH HHS; AM 30583/AM/NIADDK NIH HHS; M01RR 00102/RR/NCRR NIH HHS
Chemical
Reg. No./Substance:
0/Carbon Radioisotopes; 0/Palmitic Acids; 10028-17-8/Tritium; 50-99-7/Glucose; 57-10-3/Palmitic Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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