The fetal membranes as a possible source of amniotic fluid prostaglandins.

Biosynthesis and metabolism of prostaglandins was studied in human amniotic and chorionic membranes obtained at term. Using specific in vitro methods it was demonstrated that the fetal membranes contain an organization of enzymes regulating both synthesis and degradation of prostaglandins. Differentiation between amnion and chorion showed that virtually all of the biosynthesis and metabolism occurred in the chorion, whereas enzymatic activities in the amnion were negligible or low. The results suggest a high turnover of prostaglandins in the chorion, and its importance as a source of prostaglandins found in amniotic fluid is discussed.