Measurement of cortisol secretion rate by stable isotope methodology following oral administration of 13C-labeled cortisol to a human subject.
Plasma concentration measurements of 13C-labeled cortisol ([1,2,4,19-13C(4)]cortisol, cortisol-13C(4)) and its metabolite cortisone-13C(4) were made simultaneously with measurements of endogenous cortisol and cortisone by gas chromatography-mass spectrometry (GC-MS). After administering a small amount (3mg) of cortisol-13C(4) to a human subject, changes in cortisol secretion rates were estimated by deconvolution techniques from the measured plasma cortisol and cortisone levels and the rates of elimination and interconversion of cortisol and cortisone were obtained from the plasma concentration-time data of cortisol-13C(4) and cortisone-13C(4). The objective of this study was to look for a novel approach to quantitate rates of minute-to-minute cortisol secretion in man by taking into account the interconversion of cortisol and cortisone by 11beta-hydroxysteroid dehydrogenase (11beta-HSD).
Kasuya
Yasuji
Y
Department of Medicinal Chemistry and Clinical Pharmacy, School of Pharmacy, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, Tokyo, Japan. kasuyay@ps.toyaku.ac.jp
Yokokawa
Akitomo
A
Shibasaki
Hiromi
H
Furuta
Takashi
T
D042842:11-beta-Hydroxysteroid Dehydrogenases; D000284:Administration, Oral; D000328:Adult; D002247:Carbon Isotopes; D003348:Cortisone / Q000097:blood / Q000378:metabolism; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D006854:Hydrocortisone / Q000008:administration & dosage* / Q000097:blood / Q000378:metabolism*; D006913:Hydroxysteroid Dehydrogenases / Q000378:metabolism; D008297:Male; D013997:Time Factors
D002247:Carbon Isotopes; D006913:Hydroxysteroid Dehydrogenases; D042842:11-beta-Hydroxysteroid Dehydrogenases; D003348:Cortisone; D006854:Hydrocortisone