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  • Title: Coordinate activation of the corticotropic axis by insulin-induced hypoglycemia: simultaneous estimates of beta-endorphin, adrenocorticotropin and cortisol secretion and disappearance in normal men.
    Author: Iranmanesh A, Lizarralde G, Veldhuis JD.
    Journal: Acta Endocrinol (Copenh); 1993 Jun; 128(6):521-8. PubMed ID: 8393257.
    Abstract:
    In the present study, we investigated the coordinate kinetic response of the corticotropic axis to the acute metabolic stress of hypoglycemia by applying deconvolution analysis to adrenocorticotropin (ACTH), beta-endorphin and cortisol concentration-time series generated in seven normal men after intravenous administration of insulin. Hypoglycemic stress resulted in a 22-fold increase in the mean plasma concentration of ACTH to a maximum of 77 +/- 15 pmol/l, in conjunction with a 7.5-fold increase in the mean plasma beta-endorphin concentration, the maximal value of which was 96 +/- 11 pmol/l. Plasma cortisol concentrations increased by 2.6-fold with a mean value of 734 +/- 14 nmol/l. Maximal plasma ACTH and beta-endorphin concentrations were preceded by discrete secretory bursts with peak amplitudes of 10.5 +/- 2.7 and 10.6 +/- 2.0 pmol.l-1.min-1 (20-fold and ninefold increases compared to control), respectively. The mass of ACTH released was 114 +/- 20 pmol/l (3.4-fold increase), which corresponds to a total amount of 1.25 micrograms (50% of daily production and 0.5% of reported pituitary stores), assuming a distribution volume of 40 ml/kg. A total amount of 4.4 +/- 0.7 mg of cortisol was released after insulin-induced hypoglycemia, based on a mean cortisol secretory mass of 1088 +/- 137 nmol/l and a presumed 11.3-1 volume of distribution. Deconvolution-based estimates of the endogenous half-lives of ACTH, beta-endorphin and cortisol were 17 +/- 0.6, 22 +/- 1.7 and 65 +/- 5.3 min, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)
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