title: Measurement of 4 urinary C-18 oxygenated corticosteroids by stable isotope dilution mass fragmentography.
abstract: The cortisol C-18 oxidation pathway leading to the production of 18-hydroxy- and 18-oxocortisol is expressed in adenomatous primary aldosteronism and glucocorticoid remediable aldosteronism. In order to better define the significance of the pathway and its usefulness in differential diagnosis, we have developed a stable isotope dilution mass fragmentographic method for the determination of the tetrahydro metabolites of aldosterone, 18-hydroxycorticosterone and 18-oxocortisol and of unmetabolized 18-hydroxycortisol in urine. Stereochemically correct tetrahydro steroids containing 3 deuterium atoms were synthesized from the available 3-keto-4-pregnenes in 2 steps and 1,2-deuterium-labeled 18-hydroxycortisol was prepared by selective deuteration of the 1,2-double bond of a dienone precursor. Simultaneous measurement of the 4 steroids permitted a comparison of the abnormal products of the C-18 oxidation of cortisol with the normal C-18 oxidation products of corticosterone, 18-hydroxycorticosterone and aldosterone. Application of the method to the definition of the normal range is described.
authors.affiliation: Veterans Affairs Hospital, Bronx, New York, NY 10468.
authors.forename: S
authors.initials: S
authors.lastname: Ulick
authors.forename: C K
authors.initials: CK
authors.lastname: Chan
authors.forename: J Z
authors.initials: JZ
authors.lastname: Wang
mesh_terms: D000305:Adrenal Cortex Hormones / Q000737:chemistry / Q000652:urine*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006801:Humans; D010084:Oxidation-Reduction
chemical_list: D000305:Adrenal Cortex Hormones