Determination of 17alpha-hydroxypregnenolone sulfate and its application in diagnostics

. 2007 Apr ; 72 (4) : 323-7. [epub] 20070212

Jazyk angličtina Země Spojené státy americké Médium print-electronic

Typ dokumentu časopisecké články, práce podpořená grantem

Perzistentní odkaz   https://www.medvik.cz/link/pmid17298837
Odkazy

PubMed 17298837
DOI 10.1016/j.steroids.2006.11.026
PII: S0039-128X(06)00261-3
Knihovny.cz E-zdroje

New combined radioimmunoassay for determination of 17-hydroxypregnenolone sulfate (17-PregS) involving the hydrolysis of analyte by methanolysis was developed. 17-PregS, in addition to being secreted by the adrenals, is also formed by peripheral sulfoconjugation of 17-hydroxypregnenolone (17-Preg) or directly by hydroxylation of pregnenolone sulfate with 17alpha-hydroxylase/C17-20lyase. The measurement of 17-PregS can be used as a tool for detection of enzymatic deficiency particularly in pregnancy and for detection of congenital adrenal hyperplasia or gonadal dysfunction. The serum levels of 17-PregS, 17-Preg, dehydroepiandrosterone, dehydroepiandrosterone sulfate, pregnenolone and pregnenolone sulfate were measured in different age groups of human and in pregnant women respecting the age of gestation. The levels of 17-PregS are approximately three times higher than the levels of free 17-Preg in all subject groups. The levels of 17-PregS during pregnancy reached the local minimum in the 3rd month of gestation. The ratio of 17-PregS to free 17-Preg showed increasing profile during pregnancy with a maximum in the 8th month of gestation. These findings indicate that, the conversion of pregnenolone sulfate to 17-PregS is the major metabolic pathway for biosynthesis of 17-PregS.

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