The effect of exogenous dehydroepiandrosterone-sulfate (DHAS) on luteinizing hormone (LH), follicle-stimulating hormone (FSH), prolactin (PRL) and thyroid-stimulating hormone (TSH) pituitary secretion was studied in 8 normal women during the early follicular phase. The plasma levels of these hormones were evaluated after gonadotropin-releasing hormone (GnRH)/thyrotropin-releasing hormone (TRH) stimulation performed after placebo or after 30 mg DHAS i.v. administration. The half-life of DHAS was also calculated on two subjects; two main components of decay were detected with half-times of 0.73–1.08 and 23.1–28.8 h. The results show an adequate response of all hormones to GnRH or TRH tests which was not significantly modified, in the case of LH, FSH and PRL, when performed in the presence of high levels of DHAS. However, the TSH response to TRH was significantly less suppressed (p < 0.05) (39%) after DHAS administration than during repeated TRH stimulation without DHAS (51 %). The data support the hypothesis that DHAS does not affect LH, FSH and PRL secretion, while TSH seemed to be partially influenced.

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