Phospholipid class-specific brain enrichment in response to lysophosphatidylcholine docosahexaenoic acid infusion

Raphaël Chouinard-Watkins, Chuck T. Chen, Adam H. Metherel, R. J. Scott Lacombe, Frank Thies, Mojgan Masoodi, Richard P. Bazinet

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Abstract

Recent studies suggest that at least two pools of plasma docosahexaenoic acid (DHA) can supply the brain: non-esterified DHA (NE-DHA) and lysophosphatidylcholine (lysoPtdCho)-DHA. In contrast to NE-DHA, brain uptake of lysoPtdCho-DHA appears to be mediated by a specific transporter, but whether both forms of DHA supply undergo the same metabolic fate, particularly with regards to enrichment of specific phospholipid (PL) subclasses, remains to be determined. This study aimed to evaluate brain uptake of NE-DHA and lysoPtdCho-DHA into brain PL classes. Fifteen-week old rats were infused intravenously with radiolabelled NE-14C-DHA or lysoPtdCho-14C-DHA (n = 4/group) over five mins to achieve a steady-state plasma level. PLs were extracted from the brain and separated by thin layer chromatography and radioactivity was quantified by liquid scintillation counting. The net rate of entry of lysoPtdCho-DHA into the brain was between 62% and 85% lower than the net rate of entry of NE-DHA, depending on the PL class. The proportion of total PL radioactivity in the lysoPtdCho-14C-DHA group compared to the NE-14C-DHA group was significantly higher in choline glycerophospholipids (ChoGpl) (48% vs 28%, respectively) but lower in ethanolamine glycerophospholipids (EtnGpl) (32% vs 46%, respectively). In both groups, radioactivity was disproportionally high in phosphatidylinositol and ChoGpl but low in phosphatidylserine and EtnGpl compared to the corresponding DHA pool size. This suggests that DHA undergoes extensive PL remodeling after entry into the brain.
Original languageEnglish
Pages (from-to)1092-1098
Number of pages7
JournalBiochimica et Biophysica Acta. Molecular and Cell Biology of Lipids
Volume1862
Issue number10, Part A
Early online date28 Jul 2017
DOIs
Publication statusPublished - Oct 2017

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Lysophosphatidylcholines
Docosahexaenoic Acids
Phospholipids
Brain
Radioactivity
Glycerophospholipids
Ethanolamine
Phosphatidylcholines
Scintillation Counting
Phosphatidylserines
Thin Layer Chromatography
Phosphatidylinositols

Keywords

  • Brain
  • docosahexaenoic acid
  • lysophosphatidylcholine
  • phosphatidylcholine
  • phosphatidylethanolamine
  • phosphatidylserine

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Phospholipid class-specific brain enrichment in response to lysophosphatidylcholine docosahexaenoic acid infusion. / Chouinard-Watkins, Raphaël; Chen, Chuck T.; Metherel, Adam H.; Lacombe, R. J. Scott; Thies, Frank; Masoodi, Mojgan; Bazinet, Richard P. .

In: Biochimica et Biophysica Acta. Molecular and Cell Biology of Lipids, Vol. 1862, No. 10, Part A, 10.2017, p. 1092-1098.

Research output: Contribution to journalArticle

Chouinard-Watkins, Raphaël ; Chen, Chuck T. ; Metherel, Adam H. ; Lacombe, R. J. Scott ; Thies, Frank ; Masoodi, Mojgan ; Bazinet, Richard P. . / Phospholipid class-specific brain enrichment in response to lysophosphatidylcholine docosahexaenoic acid infusion. In: Biochimica et Biophysica Acta. Molecular and Cell Biology of Lipids. 2017 ; Vol. 1862, No. 10, Part A. pp. 1092-1098.
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AU - Masoodi, Mojgan

AU - Bazinet, Richard P.

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N2 - Recent studies suggest that at least two pools of plasma docosahexaenoic acid (DHA) can supply the brain: non-esterified DHA (NE-DHA) and lysophosphatidylcholine (lysoPtdCho)-DHA. In contrast to NE-DHA, brain uptake of lysoPtdCho-DHA appears to be mediated by a specific transporter, but whether both forms of DHA supply undergo the same metabolic fate, particularly with regards to enrichment of specific phospholipid (PL) subclasses, remains to be determined. This study aimed to evaluate brain uptake of NE-DHA and lysoPtdCho-DHA into brain PL classes. Fifteen-week old rats were infused intravenously with radiolabelled NE-14C-DHA or lysoPtdCho-14C-DHA (n = 4/group) over five mins to achieve a steady-state plasma level. PLs were extracted from the brain and separated by thin layer chromatography and radioactivity was quantified by liquid scintillation counting. The net rate of entry of lysoPtdCho-DHA into the brain was between 62% and 85% lower than the net rate of entry of NE-DHA, depending on the PL class. The proportion of total PL radioactivity in the lysoPtdCho-14C-DHA group compared to the NE-14C-DHA group was significantly higher in choline glycerophospholipids (ChoGpl) (48% vs 28%, respectively) but lower in ethanolamine glycerophospholipids (EtnGpl) (32% vs 46%, respectively). In both groups, radioactivity was disproportionally high in phosphatidylinositol and ChoGpl but low in phosphatidylserine and EtnGpl compared to the corresponding DHA pool size. This suggests that DHA undergoes extensive PL remodeling after entry into the brain.

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