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- W1517869084 abstract "The notion of an insulin-dependent translocation of the glucose transporter in rat adipocytes was confirmed by immunoblotting and reconstitution of glucose transport activity of subcellular fractions. Quantitatively, however, significantly different results were obtained with these two techniques; when compared with reconstitution, immunoblotting detected translocation of a larger amount of the transporter from a low density microsome fraction to a plasma membrane fraction. The acidtropic agents chloroquine and dibucaine, which have been reported to inhibit the recycling of various receptors, were utilized to study the detailed translocation mechanism of the glucose transporter and the insulin receptor. These acidtropic agents caused accumulation of 125I-insulin in a subcellular fraction probably corresponding to lysosomes. They did not, however, significantly affect either the insulin-induced activation of glucose transport or the recycling of the transporter and the insulin receptor as detected by immunoblotting. About 50% of radioactivity released from adipocytes which were allowed to internalize insulin was due to intact insulin, and chloroquine did not change the release rate of intact insulin, raising the possibility of receptor-mediated exocytosis of insulin. The release of degraded insulin decreased with chloroquine treatment. The results are consistent with the idea that these acidtropic agents mainly act to inhibit degradation of insulin in lysosomes, and their effect on the recycling of the glucose transporter and the insulin receptor is minimal, indicating that the recycling of these membrane proteins proceeds irrespective of organelle acidification. Electron micrographs showed vesicles underneath the plasma membranes, with sizes similar to those of the low density microsome fraction where the internalized glucose transporter and the insulin receptor were located." @default.
- W1517869084 created "2016-06-24" @default.
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- W1517869084 date "1986-03-01" @default.
- W1517869084 modified "2023-10-17" @default.
- W1517869084 title "Recycling of the glucose transporter, the insulin receptor, and insulin in rat adipocytes. Effect of acidtropic agents." @default.
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- W1517869084 doi "https://doi.org/10.1016/s0021-9258(17)35781-2" @default.
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