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Am J Physiol Endocrinol Metab 240: E630-E639, 1981;
0193-1849/81 $5.00
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AJP - Endocrinology and Metabolism, Vol 240, Issue 6 630-E639, Copyright © 1981 by American Physiological Society

ARTICLES

Dose-response characteristics for effects of insulin on production and utilization of glucose in man

R. A. Rizza, L. J. Mandarino and J. E. Gerich

To determine the dose-response characteristics for the effects of insulin on glucose production, glucose utilization, and overall glucose metabolism in normal man, 15 healthy subjects were infused with insulin for 8 h at sequential rates ranging from 0.2 to 5.0 mU.kg-1.min-1; each rate was used for 2 h. Glucose production and utilization were measured isotopically ([3-3H]glucose). Tissue insulin receptor occupancy was estimated from erythrocyte insulin binding. Glucose production was completely suppressed at plasma insulin concentrations of approximately 60 microunits/ml. Maximal glucose utilization (10-11 mg.kg-1.min-1) occurred at insulin concentrations of 200-700 microunits/ml. The concentration of insulin causing half-maximal glucose utilization (55 + 7 microunits/ml) was significantly greater than that required for half-maximal suppression of glucose production (29 +/- 2 microunits/ml, P less than 0.01). Maximal effects of insulin on glucose production and utilization occurred at plasma insulin concentrations causing 11 and 49% insulin receptor occupancy, respectively. The above dose-response relationships indicate that in man 1) glucose production is more sensitive to changes in plasma insulin concentration than is glucose utilization; 2) both hepatic and peripheral tissues may contain "spare" insulin receptors; and 3) relatively minor changes in plasma insulin concentration or insulin receptor function can cause appreciable alterations in glucose metabolism.


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