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. 1987 Mar;79(3):853–858. doi: 10.1172/JCI112894

Mechanism for enhanced glucose transport response to insulin in adipose cells from chronically hyperinsulinemic rats. Increased translocation of glucose transporters from an enlarged intracellular pool.

B B Kahn, E S Horton, S W Cushman
PMCID: PMC424219  PMID: 3029179

Abstract

The mechanism for the increased glucose transport response to insulin in adipose cells from chronically hyperinsulinemic rats was examined. Rats were infused with insulin s.c. for 2 wk. Isolated adipose cells were incubated with and without insulin, 3-O-methylglucose transport was measured, and glucose transporters in subcellular membrane fractions were assessed by cytochalasin B binding. Adipose cells from insulin-treated rats showed no change in basal but a 55% increase in insulin-stimulated glucose transport activity compared with those from control rats (7.1 +/- 0.8 vs. 4.6 +/- 0.5 fmol/cell per min, mean +/- SEM) and a corresponding increase in the concentration of glucose transporters in the plasma membranes (44 +/- 5 vs. 32 +/- 6 pmol/mg of membrane protein). In the low-density microsomes, glucose transporter concentrations in both basal and insulin-stimulated states were the same, but the total numbers were greater in cells from the insulin-treated rats because of a 39% increase in low-density microsomal protein. Therefore, chronic experimental hyperinsulinemia in the rat enhances the stimulatory action of insulin on glucose transport in the adipose cell by increasing the concentration of glucose transporters in the plasma membranes. This results from an enlarged intracellular pool due to increased intracellular protein and enhanced glucose transporter translocation in response to insulin.

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Selected References

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