Effects of oxytocin, lipopolysaccharide (LPS), and polyunsaturated fatty acids on prostaglandin secretion and gene expression in equine endometrial explant cultures.

This research article studies how treating equine endometrial explants with polyunsaturated fatty acids (PUFAs) affects prostaglandin secretion and gene expression, particularly when challenged with oxytocin or lipopolysaccharide. The study specifically explores how this can reduce the risk of luteolysis and early embryonic loss caused by uterine inflammation.

Experiments and Findings

• The researchers used equine endometrial explants (tissues) and treated them with different varieties of polyunsaturated fatty acids (PUFAs): arachidonic acid, eicosapentaenoic acid, or docosahexaenoic acid.
• These treated tissues were then exposed to oxytocin (a hormone that can induce labor) or a lipopolysaccharide (LPS; a component of the outer membrane of certain bacteria).
• The production of two types of prostaglandin, PGF(2)α and PG E(2), was measured. Prostaglandins are a group of lipids that have hormone-like effects and play a role in inflammation, among other things.

Results of the Experiment

• The results showed that media concentrations of PGF(2)α and PG E(2) were generally higher from endometrial explants challenged with oxytocin or LPS, no matter the type of fatty acid added.
• However, it was found that only docosahexaenoic acid (DHA) lowered the media concentrations of both PGF(2)α and PG E(2) from the explants.
• Stimulation of the explants with oxytocin resulted in an increased expression of a range of enzymes involved with PG synthesis, including PG-endoperoxide synthase 1 (PTGS1), PG-endoperoxide synthase 2 (PTGS2), PG F(2)α synthase (PGFS), PG E(2) synthase (PGES), and phospholipase A(2) (PLA(2)).
• Stimulation with LPS also saw an increase in the aforementioned enzymes expression, marginally more in comparison to the controls.
• It’s key to note that these results occurred regardless of which fatty acid was used. This indicates that it is the interaction of the PUFAs, specifically DHA, with the other chemicals (oxytocin, LPS) that influences the PG secretion.

Implications of Research

• This research helps to further understand the relationship between PUFAs and prostaglandin secretion—particularly in the equine endometrial explants where supplementation with PUFAs such as DHA can influence PG secretion in vitro.
• Understanding this relationship can potentially help reduce the risk of luteolysis and early embryonic loss triggered by uterine inflammation in animals.