Regulation of serum testosterone in men with steroid sulfatase deficiency: Response to human chorionic gonadotropin

Abstract

Human chorionic gonadotropin (hCG; 5000 IU) was administered to 6 control men and 6 patients with recessive x-linked ichthyosis (RXLI) with verified 3β-hydroxysteroid sulfate sulfatase (3β-HSS) deficiency in their skin biopsy samples. Concentrations of steroids and their sulfate conjugates were determined in peripheral serum specimens collected a day before and 4 days after hCG administration. Testosterone concentrations were identical in patients and controls. Baseline serum LH concentrations were also identical in the 2 groups showing that there were no major differences in the regulation of the hypothalamic-pituitary-gonadal axis. The significantly increased (31–82%) serum concentrations of sutfated pregnenolone, 17-hydroxypregnenolone, dehydroepiandrosterone and 5-androstene-3β,17β-diol in patients compared with controls indicated that their circulating concentrations were regulated by 3β-HSS. This is in line with the fact that the baseline concentrations of the same unconjugated steroids were significantly lower (32–90%) in patients with RXLI, suggesting that a proportion of these circulating steroids were derived from the corresponding sulfated precursors. The response patterns and actual concentrations of testosterone, 17-hydroxyprogesterone and estradiol were similar in the patients and the controls after hCG. The decreased concentrations of testosterone sulfated at carbon 17 under baseline conditions and after hCG in patients with RXLI remains enigmatic. In conclusion, testosterone production and the response to hCG seem to be identical in patients with RXLI and controls despite the fact that significant differences were observed in the circulating concentrations of several unconjugated and sulfated testosterone precursors.