title: Marked elevations in pro-inflammatory polyunsaturated fatty acid metabolites in females with irritable bowel syndrome.
abstract: Irritable bowel syndrome (IBS) is the most common functional gastrointestinal disorder referred to gastroenterologists. Although the pathophysiology remains unclear, accumulating evidence points to the presence of low-level immune activation both in the gut and systemically. Circulating polyunsaturated fatty acids (PUFA) have recently attracted attention as being altered in a variety of disease states. Arachidonic acid (AA), in particular, has been implicated in the development of a pro-inflammatory profile in a number of immune-related disorders. AA is the precursor of a number of important immunomodulatory eicosanoids, including prostaglandin E(2) (PGE(2)) and leukotriene B(4) (LTB(4)). We investigated the hypothesis that elevated plasma AA concentrations in plasma contribute to the proposed pro-inflammatory profile in IBS. Plasma AA and related PUFA were quantified by gas chromatography analysis in IBS patients and controls. Both PGE(2) and LTB(4) were measured in serum using commercially available ELISA assays. AA concentrations were elevated in our patient cohort compared with healthy controls. Moreover, we demonstrated that this disturbance in plasma AA concentrations leads to downstream elevations in eicosanoids. Together, our data identifies a novel proinflammatory mechanism in irritable bowel syndrome and also suggests that elevated arachidonic acid levels in plasma may serve as putative biological markers in this condition.
authors: Department of Psychiatry, University College Cork, Cork, Ireland. g.clarke@ucc.ie
authors: Gerard
authors: G
authors: Clarke
authors: Peter
authors: P
authors: Fitzgerald
authors: Alan A
authors: AA
authors: Hennessy
authors: Eugene M
authors: EM
authors: Cassidy
authors: Eamonn M M
authors: EM
authors: Quigley
authors: Paul
authors: P
authors: Ross
authors: Catherine
authors: C
authors: Stanton
authors: John F
authors: JF
authors: Cryan
authors: Timothy G
authors: TG
authors: Dinan
mesh_terms: D000328:Adult; D000368:Aged; D016718:Arachidonic Acid / Q000097:blood / Q000378:metabolism; D016022:Case-Control Studies; D015525:Fatty Acids, Omega-3 / Q000097:blood / Q000378:metabolism; D043371:Fatty Acids, Omega-6 / Q000097:blood / Q000378:metabolism; D005231:Fatty Acids, Unsaturated / Q000097:blood / Q000378:metabolism*; D005260:Female; D006801:Humans; D007249:Inflammation; D043183:Irritable Bowel Syndrome / Q000097:blood / Q000453:epidemiology / Q000378:metabolism*; D008875:Middle Aged; D055815:Young Adult
chemical_list: D015525:Fatty Acids, Omega-3; D043371:Fatty Acids, Omega-6; D005231:Fatty Acids, Unsaturated; D016718:Arachidonic Acid