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- W1583163003 abstract "Adipose and muscle tissues express an insulin-sensitive glucose transporter (GLUT4). This transporter has been shown to translocate from intracellular stores to the plasma membrane following insulin stimulation. The molecular mechanisms signalling this event and the details of the translocation pathway remain unknown. In type II diabetes, the cellular transport of glucose in response to insulin is impaired, partly explaining why blood-glucose levels in patients are not lowered by insulin as in normal individuals.Isolated rat epididymal adipocytes were stimulated with insulin and subjected to subcellular fractionation and to measurement of glucose uptake. A caveolae-rich fraction was isolated from the plasma membranes after detergent solubilization and ultracentrifugal floatation in a sucrose gradient. Presence of GLUT4 and caveolin was determined by immunoblotting after SDS-PAGE.In freshly isolated adipocytes, insulin induced a rapid translocation of GLUT4 to the plasma membrane fraction, which was followed by a slower transition of the transporter into a detergent resistant caveolae-rich region of the plasma membrane. The insulin-stimulated appearance of transporters in the caveolae-rich fraction occurred in parallel with enhanced glucose uptake by cells. Treatment with isoproterenol plus adenosine deaminase rapidly inhibited insulin-stimulated glucose transport by 40%, and at the same time GLUT4 disappeared from the caveolae-rich fraction and from plasma membranes as a whole.Insulin stimulates glucose uptake in adipocytes by rapidly translocating GLUT4 from intracellular stores to the plasma membrane. This is followed by a slower transition of GLUT4 to the caveolae-rich regions of the plasma membrane, where glucose transport appears to take place. These results have implications for an understanding of the defect in glucose transport involved in type II diabetes." @default.
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- W1583163003 date "1996-05-01" @default.
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- W1583163003 title "Insulin-Stimulated Glucose Uptake Involves the Transition of Glucose Transporters to a Caveolae-Rich Fraction within the Plasma Membrane: Implications for Type II Diabetes" @default.
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- W1583163003 doi "https://doi.org/10.1007/bf03401634" @default.
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