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Selective incorporation of docosahexaenoic acid into lysobisphosphatidic acid in cultured THP‐1 macrophages
Author(s) -
Besson Nelly,
HullinMatsuda Francoise,
Makino Asami,
Murate Motohide,
Lagarde Michel,
Pageaux JeanFrancois,
Kobayashi Toshihide,
DeltonVandenbroucke Isabelle
Publication year - 2006
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/s11745-006-5087-5
Subject(s) - biology , docosahexaenoic acid , biochemistry , oleic acid , arachidonic acid , cell culture , phospholipid , polyunsaturated fatty acid , fatty acid , enzyme , genetics , membrane
Lysobisphosphatidic acid (LBPA) is highly accumulated in specific domains of the late endosome and is involve in the biogenesis and function of this organelle. Little is known about the biosynthesis and metabolism of this lipid. We examined its FA composition and the incorporation of exogenous FA into LBPA in the human monocytic leukemia cell line THP‐1. The LBPA FA composition in THP‐1 cells exhibits an elevated amount of oleic acid (18∶1n−9) and enerichment of PUFA, especially DHA (22∶6n−3). DHA supplemented to the medium was efficiently incorporated into LBPA. In contrast, arachidonic acid (20∶4n−6) was hardly esterified to LBPA under the same experimental conditions. The turnover of DHA in LBPA was similar to that in other phospholipids. Specific incorporation of DHA into LBPA was also observed in baby hamster kidney fibroblasts, although LBPA in these cells contains very low endogenous levels of DHA in normal growth conditions. Our results, together with published observations, suggest that the specific incorporation of DHA into LBPA is a common phenomenon in mammalian cells. The physiological significance of DHA‐enriched LBPA is discussed.