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Activities of some key enzymes of carbohydrate, ketone body, adenosine and glutamine metabolism in liver, and brown and white adipose tissues of the rat.

Abstract
In general, the activities of enzymes in brown adipose tissue (BAT) are more similar to those in white adipose tissue than those in liver. Thus the activities of the glycolytic enzymes hexokinase and 6-phosphofructokinase are high but those of glucose 6-phosphatase and fructose bisphosphatase are non-detectable in the two adipose tissues. The activity of HMG-CoA synthase was non-detectable in BAT indicating that this tissue, unlike liver, cannot produce ketone bodies from fatty acid oxidation but, since the tissue possesses a high activity of HMG-CoA lyase, it might produce ketone bodies from leucine catabolism. The findings suggest that 'metabolically' brown adipose tissue can be classified better as an adipose tissue than as a peripheral liver. A high activity of 3-oxoacid CoA transferase but a non-detectable activity of 3-hydroxybutyrate dehydrogenase suggests that BAT can utilise acetoacetate but not 3-hydroxybutyrate for heat generation during cold exposure plus starvation.
AuthorsG Cooney, R Curi, A Mitchelson, P Newsholme, M Simpson, E A Newsholme
JournalBiochemical and biophysical research communications (Biochem Biophys Res Commun) Vol. 138 Issue 2 Pg. 687-92 (Jul 31 1986) ISSN: 0006-291X [Print] United States
PMID3741427 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Enzymes
  • Ketone Bodies
  • Glutamine
  • Adenosine
Topics
  • Adenosine (metabolism)
  • Adipose Tissue (enzymology)
  • Adipose Tissue, Brown (enzymology)
  • Animals
  • Carbohydrate Metabolism
  • Citric Acid Cycle
  • Enzymes (metabolism)
  • Gluconeogenesis
  • Glutamine (metabolism)
  • Glycolysis
  • Ketone Bodies (metabolism)
  • Liver (enzymology)
  • Male
  • Organ Specificity
  • Rats

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