Reduced glucose incorporation to triglycerides following chronic exposure of human fat cells to growth hormone

Publisher Website
Google Scholar
Abstract
Using the tissue culture technique it was recently demonstrated that long-term exposure of human adipose tissue to human growth hormone (GH) in vitro leads to an impairment in glucose incorporation into triglycerides. Biopsies of human adipose tissue which were cultured for 1 wk with or without GH were studied in subsequent short-term incubations where the conversion of glucose to CO2 and to total lipids was determined. CO2 formation was not changed by previous exposure of the biopsies to GH whereas the incorporation of glucose into triglycerides was reduced by about one third. Total glucose metabolism, as determined from the sum of the 2 pathways, was significantly reduced. The activities of 3 glycolytic enzymes were determined in biopsies of human adipose tissue which had been cultured with or without GH for 1 wk. Phosphofructokinase activity was reduced, while hexokinase and glucose-6-phosphate dehydrogenase activities were unchanged. The diminished activity of phosphofructokinase, the enzyme considered to be rate-limiting for glycolysis in human fat cells, may be responsible for the decreased rate of glucose metabolism found.