Cortisol-induced insulin resistance in man: impaired suppression of glucose production and stimulation of glucose utilization due to a postreceptor detect of insulin action

The Journal of Clinical Endocrinology and Metabolism
R A RizzaJ E Gerich

Abstract

The present studies were undertaken to assess the mechanisms responsible for cortisol-induced insulin resistance in man. The insulin dose-response characteristics for suppression of glucose production and stimulation of glucose utilization and their relationship to monocyte and erythrocyte insulin receptor binding were determined in six normal volunteers after 24-h infusion of cortisol and 24-h infusion of saline. The infusion of cortisol (2 microgram kg-1 min-1) increased the plasma cortisol concentration approximately 4-fold (37 +/- 3 vs. 14 +/- 1 microgram/dl; P less than 0.01) to values observed during moderately severe stress in man. This hypercortisolemia increased postabsorptive plasma glucose (126 +/- 2 vs. 97 +/- 2 mg/dl; P less than 0.01) and plasma insulin (16 +/- 2 vs. 10 +/- 2 microU/ml; P less than 0.01) concentrations and rates of glucose production (2.4 +/- 0.1 vs. 2.1 +/- -0.1 mg kg-1 min-1; P less than 0.01) and utilization (2.5 +/- 0.1 vs. 2.1 +/- 0.1 mg kg-1 min -1; P less than 0.01). Insulin dose-response curves for both suppression of glucose production (half-maximal response at 81 +/- 19 vs. 31 +/ 5 microU/ml; P less than 0.05) and stimulation of glucose utilization (half-maximal response at 104 +/- 9 vs....Continue Reading

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