Document Detail


Leukotriene B4 promotes phospholipid acylation in human neutrophils.
MedLine Citation:
PMID:  1650878     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The present study was undertaken to test the hypothesis that leukotriene B4 (LTB4) may promote extracellular fatty acid incorporation into neutrophil choline glycerophospholipids (PC) to replenish phospholipids after deacylation. Incubation of human neutrophils with LTB4 (1.5 to 150 nM) for 1 to 5 min resulted in increased fatty acid incorporation into phosphatidylinositol (PI), diacyl-sn-glycero-3-phosphocholine (diacyl-GPC) and alkylacyl-GPC. The magnitude of stimulation (percentage of control) of fatty acid incorporation appears to reflect increased activity of the acyltransferase catalyzing acylation of the respective lysophospholipids. LTB4 stimulation of arachidonic acid incorporation into PI was greater than into PC, whereas the stimulation of palmitic acid incorporation into PC was greater than into PI. LTB4 stimulated phosphatidic acid labeling by palmitic acid but not by arachidonic acid. LTB4 and 1-O-alkyl-2-N-methylcarbamyl-sn-glycero-3-phosphocholine (cPAF) exhibited a similar stimulatory effect on fatty acid incorporation into the PC fraction. Phosphate analysis could not detect changes in the mass of PI or of PC in neutrophils exposed to LTB4 or cPAF. The results suggest that increased fatty acid incorporation into phospholipids in LTB4-activated neutrophils reflects activation of phospholipase A2 and acyltransferases as well as of de novo phospholipid synthesis.
Authors:
J S Tou; S Healey
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Lipids     Volume:  26     ISSN:  0024-4201     ISO Abbreviation:  Lipids     Publication Date:  1991 Apr 
Date Detail:
Created Date:  1991-09-12     Completed Date:  1991-09-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0060450     Medline TA:  Lipids     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  327-30     Citation Subset:  IM    
Affiliation:
Department of Biochemistry, Tulane University School of Medicine, New Orleans, Louisiana 70112.
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MeSH Terms
Descriptor/Qualifier:
Acylation
Arachidonic Acid
Arachidonic Acids / blood*
Humans
Kinetics
Leukotriene B4 / pharmacology*
Neutrophils / drug effects,  metabolism*
Palmitic Acid
Palmitic Acids / blood*
Phospholipids / blood*
Chemical
Reg. No./Substance:
0/Arachidonic Acids; 0/Palmitic Acids; 0/Phospholipids; 506-32-1/Arachidonic Acid; 57-10-3/Palmitic Acid; 71160-24-2/Leukotriene B4

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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