Regulation of rat plasma and cerebral cortex oxylipin concentrations with increasing levels of dietary linoleic acid

Ameer Y. Taha, Marie Hennebelle, Jun Yang, Daisy Zamora, Stanley I. Rapoport, Bruce D. Hammock, Christopher E. Ramsden

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Linoleic acid (LA, 18:2n-6) is the most abundant polyunsaturated fatty acid in the North American diet and is a precursor to circulating bioactive fatty acid metabolites implicated in brain disorders. This exploratory study tested the effects of increasing dietary LA on plasma and cerebral cortex metabolites derived from LA, its elongation-desaturation products dihomo-gamma linolenic (DGLA, 20:3n-6) acid and arachidonic acid (AA, 20:4n-6), as well as omega-3 alpha-linolenic (α-LNA, 18:3n-3), eicosapentaenoic (EPA, 20:5n-3) and docosahexaenoic acid (DHA, 22:6n-3). Plasma and cortex were obtained from rats fed a 0.4%, 5.2% or 10.5% energy LA diet for 15 weeks and subjected to liquid chromatography tandem mass spectrometry analysis. Total oxylipin concentrations, representing the esterified and unesterified pool, and unesterified oxylipins derived from LA and AA were significantly increased and EPA metabolites decreased in plasma at 5.2% or 10.5% energy LA compared to 0.4% energy LA. Unesterified plasma DHA metabolites also decreased at 10.5% energy LA. In cortex, total and unesterified LA and AA metabolites increased and unesterified EPA metabolites decreased at 5.2% or 10.5% LA. DGLA and α-LNA metabolites did not significantly change in plasma or cortex. Dietary LA lowering represents a feasible approach for targeting plasma and brain LA, AA, EPA or DHA-derived metabolite concentrations.

Original languageEnglish (US)
JournalProstaglandins Leukotrienes and Essential Fatty Acids
DOIs
StateAccepted/In press - Feb 10 2016

Fingerprint

Oxylipins
Linoleic Acid
Metabolites
Cerebral Cortex
Rats
Plasmas
Nutrition
Diet
Brain
Docosahexaenoic Acids
Brain Diseases
Tandem Mass Spectrometry
Unsaturated Fatty Acids
Arachidonic Acid
Liquid Chromatography
Liquid chromatography
Fatty Acids
Mass spectrometry
Elongation
Acids

Keywords

  • Brain
  • High LA
  • Mediators
  • Metabolites
  • Omega-6 linoleic acid (LA)
  • Oxylipin
  • Plasma

ASJC Scopus subject areas

  • Cell Biology
  • Clinical Biochemistry

Cite this

Regulation of rat plasma and cerebral cortex oxylipin concentrations with increasing levels of dietary linoleic acid. / Taha, Ameer Y.; Hennebelle, Marie; Yang, Jun; Zamora, Daisy; Rapoport, Stanley I.; Hammock, Bruce D.; Ramsden, Christopher E.

In: Prostaglandins Leukotrienes and Essential Fatty Acids, 10.02.2016.

Research output: Contribution to journalArticle

Taha, Ameer Y. ; Hennebelle, Marie ; Yang, Jun ; Zamora, Daisy ; Rapoport, Stanley I. ; Hammock, Bruce D. ; Ramsden, Christopher E. / Regulation of rat plasma and cerebral cortex oxylipin concentrations with increasing levels of dietary linoleic acid. In: Prostaglandins Leukotrienes and Essential Fatty Acids. 2016.
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AU - Taha, Ameer Y.

AU - Hennebelle, Marie

AU - Yang, Jun

AU - Zamora, Daisy

AU - Rapoport, Stanley I.

AU - Hammock, Bruce D.

AU - Ramsden, Christopher E.

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AB - Linoleic acid (LA, 18:2n-6) is the most abundant polyunsaturated fatty acid in the North American diet and is a precursor to circulating bioactive fatty acid metabolites implicated in brain disorders. This exploratory study tested the effects of increasing dietary LA on plasma and cerebral cortex metabolites derived from LA, its elongation-desaturation products dihomo-gamma linolenic (DGLA, 20:3n-6) acid and arachidonic acid (AA, 20:4n-6), as well as omega-3 alpha-linolenic (α-LNA, 18:3n-3), eicosapentaenoic (EPA, 20:5n-3) and docosahexaenoic acid (DHA, 22:6n-3). Plasma and cortex were obtained from rats fed a 0.4%, 5.2% or 10.5% energy LA diet for 15 weeks and subjected to liquid chromatography tandem mass spectrometry analysis. Total oxylipin concentrations, representing the esterified and unesterified pool, and unesterified oxylipins derived from LA and AA were significantly increased and EPA metabolites decreased in plasma at 5.2% or 10.5% energy LA compared to 0.4% energy LA. Unesterified plasma DHA metabolites also decreased at 10.5% energy LA. In cortex, total and unesterified LA and AA metabolites increased and unesterified EPA metabolites decreased at 5.2% or 10.5% LA. DGLA and α-LNA metabolites did not significantly change in plasma or cortex. Dietary LA lowering represents a feasible approach for targeting plasma and brain LA, AA, EPA or DHA-derived metabolite concentrations.

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