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1. Isolated chromaffin cells from bovine adrenal medulla were used to study glucose transport in a homogeneous neural tissue. 2. The affinity of glucose transporters was 1.20 +/- 0.52 mM by the infinite-cis technique and 1.02 +/- 0.09 mM by the direct transport experiments. 3. The affinity for 2-deoxyglucose of these transporters was 2.3 mM. 4. The glucose transporters, quantified by [3H]cytochalasin B binding, were 419,532 +/- 120,740 receptors/cell, which corresponds to about 7.2 +/- 2 pmol/mg of protein, with KD = 0.1 microM. 5. High-affinity insulin receptors with KD = 3.95 nM were present at a density of 68,400 +/- 7500 per cell. 6. Insulin and secretagogues increased glucose transport, raising the transporter number at the plasma membrane without changes in the affinity.

Glucose transporters in isolated chromaffin cells. Effects of insulin and secretagogues