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• W2148162359 abstract "Experimentally induced hyperinsulinemia reduces serum adrenal androgen levels in man, but does not alter cortisol secretion. To determine whether insulin might selectively inhibit adrenal androgen production by suppressing 17,20-lyase activity, ACTH-stimulated androgen secretion was assessed in 10 normal men after an insulin infusion (hyperinsulinemic-euglycemic clamp) or a control saline infusion. For the insulin clamp study, each man received a 2-U (14.4-nmol) insulin bolus dose, followed by a 2.0-mU/kg.min (14.4-pmol/kg.min) insulin infusion for 5 h. An average insulin level of 746 +/- 35 (+/- SE) pmol/L was achieved; serum glucose was maintained at 4.96 +/- 0.03 mmol/L. At the end of the insulin infusion, an ACTH stimulation test was performed, and serum steroid levels were determined 30 and 60 min later. Subjects returned 1-3 weeks later for control studies, during which 0.45% saline was infused at rates matched exactly to the rates of the dextrose and insulin infusions during the insulin clamp studies, and an ACTH stimulation test was performed after 5 h of saline infusion. After the insulin infusion, stimulation by ACTH resulted in a significant rise in the serum molar ratio of 17 alpha-hydroxyprogesterone to androstenedione (from 0.914 +/- 0.110 at zero time to 1.388 +/- 0.278 60 min after ACTH; P less than 0.05), whereas no change occurred in the ACTH-stimulated ratio of these steroids after the saline infusion (1.067 +/- 0.109 at zero time to 1.060 +/- 0.109 60 min after ACTH; P = NS). The insulin-induced change in this steroid ratio was due to a relative increase in precursor (17 alpha-hydroxyprogesterone) and decrease in product (androstenedione) responsiveness to ACTH. Similarly, insulin treatment resulted in a greater than 100% rise in the difference from baseline in the serum molar ratio of 17 alpha-hydroxypregnenolone to dehydroepiandrosterone 30-60 min after ACTH (P less than 0.004), whereas no change in this difference was observed after the saline infusion (P = 0.71). Again, the insulin-induced change in this steroid ratio was due to a relative increase in precursor (17 alpha-hydroxypregnenolone) and decrease in product (dehydroepiandrosterone) responsiveness to ACTH. Of note, insulin treatment altered neither cortisol responsiveness to ACTH nor 17 alpha-hydroxylase activity, as indicated by similar ACTH-stimulated responses in the serum molar ratio of progesterone to 17 alpha-hydroxyprogesterone after the insulin and saline infusions (P = 0.71). Hence, the results of this study indicate that the acute elevation of serum insulin levels into the high physiological range selectively inhibits adrenal 17,20-lyase activity in man." @default.
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• W2148162359 date "1992-02-01" @default.
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• W2148162359 title "Insulin inhibits adrenal 17,20-lyase activity in man." @default.
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• W2148162359 doi "https://doi.org/10.1210/jcem.74.2.1730815" @default.
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