Effects of n-6 polyunsaturated fatty acids on prostaglandin production in ovine fetal chorion cells in vitro in late gestation ewes

ObjectiveTo use an in vitro model of the ovine placenta to determine effects of n-6 polyunsaturated fatty acid (PUFA) supplementation on prostaglandin (PG) production. PGs are key regulators of fetal maturation and parturition.Study designFetal allantochorion tissue (FC) was collected in late pregnancy (day 135). FC cells were isolated and cultured with 0–100 μM of linoleic acid (LA), γ-linolenic acid (GLA) or arachidonic acid (AA) in serum free medium and challenged with control medium, lipopolysaccharide (LPS, 0.1 μg/ml), dexamethasone (DEX, 5 μM) or a combination of LPS (0.1 μg/ml) with DEX (5 μM). Spent medium was harvested at 2 h and 24 h post challenge for measuring PGs.Main outcome measuresTo assess the effects of treatment on placental 1- and 2-series PGE production.ResultsLA supplementation inhibited both PGE1 and PGE2 production. GLA predominantly stimulated PGE1 generation, although it also increased PGE2 production. AA supplementation predominantly increased PGE2 production, but also stimulated PGE1. DEX treatment with or without LPS inhibited PG production. Supplementation with n-6 PUFAs attenuated or neutralised the stimulatory effect of LPS challenge on FC cells for both PGE1 and PGE2 production.ConclusionThese data show that supplementation with n-6 PUFAs alters placental PG production, but their precise effects depend on their position in the biosynthetic pathway for PG synthesis. This study supports the possibility that GLA containing oils, widely promoted as dietary supplements, might reduce the risk of pre-term labour by inhibiting the responsiveness of PGE2 production to LPS challenge in the placenta.