title: Effects of n-6 polyunsaturated fatty acids on prostaglandin production in ovine fetal chorion cells in vitro in late gestation ewes.
abstract: OBJECTIVE
  To 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.
  
  
  METHODS
  Fetal 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.
  
  
  METHODS
  To assess the effects of treatment on placental 1- and 2-series PGE production.
  
  
  RESULTS
  LA supplementation inhibited both PGE(1) and PGE(2) production. GLA predominantly stimulated PGE(1) generation, although it also increased PGE(2) production. AA supplementation predominantly increased PGE(2) production, but also stimulated PGE(1). 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 PGE(1) and PGE(2) production.
  
  
  CONCLUSIONS
  These 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 PGE(2) production to LPS challenge in the placenta.
authors.affiliation: Department of Veterinary Basic Sciences, Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield, Herts.,UK. zcheng@rvc.ac.uk
authors.forename: Z
authors.initials: Z
authors.lastname: Cheng
authors.forename: M
authors.initials: M
authors.lastname: Elmes
authors.forename: S
authors.initials: S
authors.lastname: Kirkup
authors.forename: D R E
authors.initials: DR
authors.lastname: Abayasekara
authors.forename: D C
authors.initials: DC
authors.lastname: Wathes
mesh_terms: D000527:Alprostadil / Q000378:metabolism*; D000818:Animals; D049109:Cell Proliferation / Q000187:drug effects; D003907:Dexamethasone / Q000494:pharmacology; D019587:Dietary Supplements; D015232:Dinoprostone / Q000096:biosynthesis*; D043371:Fatty Acids, Omega-6 / Q000494:pharmacology*; D005260:Female; D008070:Lipopolysaccharides / Q000494:pharmacology; D010920:Placenta / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D011247:Pregnancy; D012756:Sheep
chemical_list: D043371:Fatty Acids, Omega-6; D008070:Lipopolysaccharides; D003907:Dexamethasone; D000527:Alprostadil; D015232:Dinoprostone