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2016 ; 127
(ä): 1-8
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Lipid profiling of polarized human monocyte-derived macrophages
#MMPMID27871801
Montenegro-Burke JR
; Sutton JA
; Rogers LM
; Milne GL
; McLean JA
; Aronoff DM
Prostaglandins Other Lipid Mediat
2016[Dec]; 127
(ä): 1-8
PMID27871801
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The highly orchestrated transcriptional and metabolic reprogramming during
activation drastically transforms the main functions and physiology of human
macrophages across the polarization spectrum. Lipids, for example, can modify
protein function by acting remotely as signaling molecules but also locally by
altering the physical properties of cellular membranes. These changes play key
roles in the functions of highly plastic immune cells due to their involvement in
inflammation, immune responses, phagocytosis and wound healing processes. We
report an analysis of major membrane lipids of distinct phenotypes of resting
(M0), classically activated (M1), alternatively activated (M2a) and deactivated
(M2c) human monocyte derived macrophages from different donors. Samples were
subjected to supercritical fluid chromatography-ion mobility-mass spectrometry
analysis, which allowed separations based on lipid class, facilitating the
profiling of their fatty acid composition. Different levels of arachidonic acid
mobilization as well as other fatty acid changes were observed for different
lipid classes in the distinct polarization phenotypes, suggesting the activation
of highly orchestrated and specific enzymatic processes in the biosynthesis of
lipid signaling molecules and cell membrane remodeling. Thromboxane A2 production
appeared to be a specific marker of M1 polarization. These alterations to the
global composition of lipid bi-layer membranes in the cell provide a potential
methodology for the definition and determination of cellular and tissue
activation states.