Decrease in human plasma prolactin levels by oral prostaglandin E2 in early puerperium

Area of Science:

• Reproductive endocrinology
• Pharmacology

Background:

• Prolactin is a key hormone in postpartum lactation.
• The regulation of prolactin levels postpartum is not fully understood.

Purpose of the Study:

• To investigate the effect of prostaglandin E2 (PGE2) on plasma prolactin levels in puerperal women.

Main Methods:

• 12 puerperal women received 8 mg of oral PGE2 over 2 hours on day 4 postpartum.
• Plasma prolactin levels were measured and compared to basal levels and controls.
• The study also included 4 puerperal women on day 30 and 4 non-pregnant women.

Main Results:

• PGE2 administration resulted in a significant decrease in plasma prolactin levels compared to basal and control levels.
• The same PGE2 dose did not affect prolactin levels in women on day 30 postpartum or in non-pregnant women.

Conclusions:

• Prostaglandin E2 (PGE2) effectively reduces prolactin levels in the early postpartum period.
• The findings suggest that PGE2's prolactin-lowering effect may involve hypothalamic dopaminergic pathways.
• This effect appears specific to the early postpartum phase.