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- W1584581247 abstract "In muscle and fat, insulin causes the cellular redistribution of glucose transporters and insulin-like growth factor II receptors from an intracellular pool of membranes (low density microsomes) to the plasma membrane. This translocation is a major mechanism by which insulin stimulates cellular glucose uptake. Our aim was to purify and characterize the insulin-regulatable exocytic intracellular membranes that are enriched in glucose transporter. Low density microsome and plasma membrane fractions were isolated from basal and insulin-stimulated rat adipocytes by differential centrifugation. In cells exposed to insulin, glucose transporters were decreased in the low density microsomes and correspondingly increased in the plasma membranes as determined by immunoblotting and cytochalasin B binding. Low density microsomes were further fractionated by sucrose density gradient centrifugation. Membranes containing glucose transporters were separated from the major protein-containing peaks and from plasma membranes, Golgi, and endoplasmic reticulum. Further fractionation was achieved by agarose gel electrophoresis. Overall, the intracellular membranes enriched in transporter were purified 9-fold compared to low density microsomes. These purified membranes had the following characteristics: 1) uniformly sized vesicles, diameter 60-100 nm; 2) insulin-regulatable protein composition, one constituent being an Mr 43,000 protein that co-migrated with immunoblotted glucose transporters; 3) enrichment in insulin-like growth factor II receptors, but of a lesser degree than the enrichment in transporters. Thus, using a three-step procedure, insulin-sensitive translocatable vesicles from adipocytes have been highly purified. These are similar in size and density to endosomes, and the glucose transporter is a major constituent of this distinct vesicle population." @default.
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- W1584581247 date "1987-08-01" @default.
- W1584581247 modified "2023-10-16" @default.
- W1584581247 title "Purification of insulin-dependent exocytic vesicles containing the glucose transporter." @default.
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- W1584581247 doi "https://doi.org/10.1016/s0021-9258(18)60887-7" @default.
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