Sleep-associated gonadotrophin and oestradiol patterns in girls with precocious sexual development.

Circulating concentrations of gonadotrophins and oestradiol (E2) during sleep were examined in six girls aged 5-10 years with precocious sexual development. All subjects exhibited nocturnal increments of LH and/or FSH. Gonadotrophin secretion appeared to vary from pulsatile release to random oscillations. Three subjects with LH pulses of greater than 5 miu/ml and a concomitant FSH rise had a temporal elevation of E2 during sleep. The other three subjects with pulses of either LH or FSH of less than 5 miu/ml had no nocturnal rise in E2. These data suggest that the nocturnal elevation of E2 results from pituitary release of both LH and FSH, leads to premature sexual development, and may be occasioned by inappropriate timing of hypothalamic gonadotrophin-releasing hormone (LHRH) secretion.