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Incorporation of [ 3 H]Arachidonic and [ 14 C]Eicosapentaenoic Acids into Glycerophospholipids and Their Metabolism via Lipoxygenases in Isolated Brain Cells from Rainbow Trout Oncorhaynchus mykaiss
Author(s) -
Tocher Douglas R.,
Bell J. Gordon,
Sargent John R.
Publication year - 1991
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1111/j.1471-4159.1991.tb06425.x
Subject(s) - glycerophospholipids , arachidonic acid , eicosapentaenoic acid , phosphatidylcholine , biochemistry , lipoxygenase , polyunsaturated fatty acid , chemistry , phosphatidylethanolamine , metabolism , eicosanoid , trout , biology , fatty acid , phospholipid , enzyme , membrane , fishery , fish <actinopterygii>
The incorporation of [ 3 H]arachidonate ([ 3 H]AA) and [ 14 C]eicosapentaenoate ([ 14 C]EPA) into glycerophos‐pholipids was studied in isolated brain cells from rainbow trout, a teleost fish whose lipids are rich in (n‐3) polyunsaturated fatty acids (PUF As), EPA was incorporated into total lipid to a greater extent than AA, but the incorporation of both PUF As into total glycerophospholipids was almost identical. The incorporation of both AA and EPA was greatest into phosphatidylethanolamine (PE). However, when expressed per milligram of individual phosphoglycerides, both AA and EPA were preferentially incorporated into phospha‐tidylinositol (PI), the preference being significantly greater with AA. On the same basis, significantly more EPA than AA was incorporated into phosphatidylcholine (PC). When double‐labelled cells were challenged with calcium ionophore A23187, the 3 H and 14 C released from the cells closely paralleled each other, peaking at 10 min after addition of ionophore. The 12‐monohydroxylated derivative was the predominant lipoxygenase product from both AA and EPA with a rank order of 12‐hydroxyeicosatetraenoic acid (12‐HETE) > leukotriene B 4 (LTB 4 ) > 5‐HETE > 15‐HETE for the AA products and 12‐hydroxyeicosapentaenoic acid (12‐HEPE) > 5‐HEPE > LTB 5 > 15‐HEPE for EPA products. The 3 H/ 14 C (dpm/dpm) ratios in the glycerophospholipids, total released radioactivity, and the lipoxygenase products suggested that PC rather than PI was the likely source of eicosanoid precursors in trout brain cells.

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