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Journal of Lipid Research, Vol 25, 383-388, Copyright © 1984 by Lipid Research, Inc.

ARTICLES

1-O-alkyl-linked glycerophospholipids of human neutrophils: distribution of arachidonate and other acyl residues in the ether- linked and diacyl species

HW Mueller, JT O'Flaherty, DG Greene, MP Samuel and RL Wykle

This study was done to determine whether human neutrophils contain sufficient 1-O-alkyl-2-acyl-sn-glycero-3-phosphocholine to support the synthesis of platelet activating factor by a deacylation-reacylation mechanism, and to examine the relative distribution of arachidonate among the 1,2-diacyl, 1-O-alkyl-2-acyl, and the 1-O-alk-1'-enyl-2-acyl classes of choline- and ethanolamine-containing phospholipids. The predominant phospholipid species of human neutrophils were choline- containing glycerophospholipids (41%), ethanolamine-containing glycerophospholipids (39%), and sphingomyelin (14%), with smaller quantities of phosphatidylserine (4%) and phosphatidylinositol (1%). The choline-linked fraction contained high amounts of 1-O-alkyl-2-acyl- X (44%) and 1,2-diacyl-sn-glycero-3-phosphocholine (47%), and a lesser amount of 1-O-alk-1'-enyl-2-acyl-sn-glycero-3-phosphocholine (9%). In contrast, the ethanolamine-linked fraction contained a large amount of 1-O-alk-1'-enyl-2-acyl-sn-glycero-3-phosphoethanolamine (66%), and lower levels of the 1,2-diacyl (24%) and 1-O-alkyl-2-acyl (10%) species. The major 1-O-alkyl and 1-O-alk-1'-enyl ether chains found in the choline and ethanolamine phospholipid pools were 16:0, 18:0, 18:1, and 20:0. The predominant fatty acyl residues found in the 1,2-diacyl and the sn-2 position of the 1-O-alkyl-2-acyl and 1-O-alk-1'-enyl-2- acyl choline and ethanolamine glycerophospholipids were 16:0, 18:0, 18:1, 18:2, and 20:4.(ABSTRACT TRUNCATED AT 250 WORDS)
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