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• W1603388614 abstract "Treatment of primary cultured adipocytes with 20 mM glucose resulted in a progressive increase in specific 125I-insulin binding that began almost immediately (no lag period) and culminated in a 60% increase by 24 h. This effect was dose-dependent (glucose ED50 of 4.6 mM) and mediated by an increase in insulin receptor affinity. Moreover, it appears that glucose modulates insulin receptor affinity through de novo protein synthesis rather than through covalent modification of receptors, since cycloheximide selectively inhibited the glucose-induced increase in insulin binding capacity (ED50 of 360 ng/ml) and restored receptor affinity to control values. Importantly, insulin sensitivity of the glucose transport system was increased by glucose treatment (63%) to an extent comparable with the enhancement in receptor affinity, thus indicating a functional coupling between insulin binding and insulin action. When the long term effects of insulin were assessed (24 h), we found that insulin treatment reduced 125I-insulin binding by greater than 60% by down-regulating the number of cell surface receptors in a dose-dependent manner (insulin ED50 of 7.4 ng/ml). On the basis of these studies, we conclude that 1) insulin binding is subject to dual regulation (glucose controls insulin action by enhancing receptor affinity, whereas insulin controls the number of cell surface receptors); and 2) glucose appears to modulate insulin receptor affinity through the rapid biosynthesis of an affinity regulatory protein." @default.
• W1603388614 created "2016-06-24" @default.
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• W1603388614 date "1990-11-01" @default.
• W1603388614 modified "2023-09-27" @default.
• W1603388614 title "Glucose regulation of insulin receptor affinity in primary cultured adipocytes." @default.
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• W1603388614 doi "https://doi.org/10.1016/s0021-9258(17)30597-5" @default.
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