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Journal of Clinical Endocrinology & Metabolism, Vol 58, 187-191, Copyright © 1984 by Endocrine Society


ARTICLES

Plasma adrenocorticotropin, cortisol, and aldosterone responses to corticotropin-releasing factor: modulatory effect of basal cortisol levels

AR Hermus, GF Pieters, AG Smals, TJ Benraad and PW Kloppenborg

Two hundred micrograms of corticotropin-releasing factor (CRF) were administered as an iv bolus injection to 10 normal subjects (5 men and 5 women). Mean plasma ACTH levels rose significantly (P less than 0.0005, by Friedman's nonparametric analysis of variance) from a basal value of 27 +/- 5 pg/ml (mean +/- SEM) to a peak value of 63 +/- 8 pg/ml 30 min after CRF administration. This ACTH response was followed by a rise in plasma mean cortisol levels (P less than 0.0005, by Friedman's test) from a baseline value of 12.3 +/- 1.4 micrograms/100 ml to a peak value of 21.0 +/- 0.7 micrograms/100 ml 60 min after CRF and a rise in mean plasma aldosterone levels from a basal value of 13 +/- 2 ng/100 ml to a peak value of 23 +/- 2 ng/100 ml. There was no significant difference between men and women in the responsiveness of ACTH, cortisol, and aldosterone to CRF administration. The individual basal cortisol levels were highly significantly and negatively correlated with the areas under the individual ACTH curves (r = -0.76; P less than 0.005, by Pearson's correlation test) and cortisol curves (r = -0.91; P less than 0.001, by Pearson's test). These data suggest a modulatory effect of physiological cortisol levels on the response of the pituitary-adrenal axis to CRF.


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