Abstract
The individual molecular species composition of diacyl, alkylacyl and alkenylacyl glycerophospholipids was determined in mouse peritoneal macrophages. A marked deterogeneity in the relative composition (mol%) of macrophage ether and ester phospholipid individual species was noted. High concentrations of 16∶0–20∶4 were found in ether phospholipids such as alkenylacyl glycerophosphoethanolamine (GPE; 27.5 mol%) and alkylacyl glycerophosphocholine (GPC; 16.6%) as compared to mol % levels of 16∶0–20∶4 in diacyl GPE (5.7%) and diacyl GPC (8.1%), respectively. Interestingly, alkenylacyl GPE was highly enriched in 1-ether (16∶0) relative to alkylacyl GPC. The predominant diacyl molecular species in glycerophosphoinositol (GPI) and glycerophosphoserine (GPS) were 18∶0–20∶4 (59.1%) and 16∶0–18∶1 (41.1%), respectively. It is noteworthy that the level of 18∶0–20∶4 was several times higher in diacyl GPI (59.1%) than in diacyl GPS (11.1%), diacyl GPE (25.7%), and diacyl GPC (3.7%). The most abundant molecular species in diacyl GPC and diacyl GPE were 16∶0–18∶1 (29.9%) and 18∶0–20∶4 (25.7%), respectively. The abundance of 20∶4 in ether phospholipids, specifically 16∶0–20∶4 and 18∶0–20∶4, in alkylacyl GPC is significant in view of the role these antecedents play in the biosynthesis of platelet-activating factor (PAF) and 20∶4-derived eicosanoids in stimulated macrophages. The unique molecular species composition of the peritoneal macrophage distinguishes this cell type from others.
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Abbreviations
- ANS:
-
8-anilino-1-napthalenesulfonic acid ammonium salt
- BHT:
-
butylated hydroxytoluene
- DMA:
-
dimethylacetal
- FAME:
-
fatty acid methyl ester
- GC:
-
gas chromatography
- GPC:
-
glycerophosphocholine
- GPE:
-
glycerophosphoethanolamine
- GPI:
-
glycerophosphoinositol
- GPS:
-
glycerophosphoserine
- HPLC:
-
high-performance liquid chromatography
- PAF:
-
platelet-activating factor
- PMN:
-
polymorphonuclear leukocytes
- PUFA:
-
polyunsaturated fatty acids, Rf, retardation factor
- RRT:
-
relative retention time
- TLC:
-
thin-layer chromatography
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Akoh, C.C., Chapkin, R.S. Composition of mouse peritoneal macrophage phospholipid molecular species. Lipids 25, 613–617 (1990). https://doi.org/10.1007/BF02536011
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DOI: https://doi.org/10.1007/BF02536011