Effect of prostaglandin E2 or prostaglandin synthesis inhibitors on human gonadotrophins and prolactin.

Abstract

A role for prostaglandins (PGs) in the release of pituitary hormones in humans is controversial. The effect of PGE2 or PG synthesis inhibitors on gonadotrophin and prolactin (PRL) levels was evaluated in 50 volunteers (25 males and 25 females). Forty cases in four equal groups (Group I & II were males and group III & IV were females) received iv infusion of PGE2 in one cycle and non-steroidal anti-inflammatory drugs (NSAID) [Indomethacin or Naproxen] in the subsequent cycle. Control groups A & B (5 males and 5 females) received saline infusions in one cycle and placebo capsules in the next cycle. Neither PGE2 nor any of the two NSAID altered the basal levels of FSH or LH significantly. PGE2 infusions in males depressed PRL levels significantly two hours after the onset of infusions. Indomethacin raised PRL levels while Naproxen did not. In women, a similar response was also observed but prolactin levels decreased earlier (30 min from the PGE2 infusion). These data indicate a probable role for PGE2 or other prostanoids as well in the regulation of human PRL release but not in gonadotrophin secretion.