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Amunugama, Kaushalya; Jellinek, Matthew J.; Kilroy, Megan P.; Albert, Carolyn J.; Rasi, Valerio; Hoft, Daniel F.; Shashaty, Michael G.S.; Meyer, Nuala J.; Ford, David A.
Redox biology, 12/2021, Volume: 48Journal Article
Plasmalogens are a class of phospholipids containing vinyl ether linked aliphatic groups at the sn-1 position. Plasmalogens are known to contain 16- and 18-carbon aliphatic groups at the sn-1 position. Here, we reveal that the human neutrophil plasmenylethanolamine pool uniquely includes molecular species with very long carbon chain (VLC) aliphatic groups, including 20-, 22- and 24-carbon vinyl ether linked aliphatic groups at the sn-1 position. We identified these novel VLC plasmalogen species by electrospray ionization mass spectrometry methods. VLC plasmalogens were only found in the neutrophil plasmenylethanolamine pool. During neutrophil activation, VLC plasmenylethanolamines undergo myeloperoxidase-dependent oxidation to produce VLC 2-chlorofatty aldehyde and its oxidation product, 2-chlorofatty acid (2-ClFA). Furthermore, plasma concentrations of VLC 2-ClFA are elevated in human sepsis. These studies demonstrate for the first time VLC plasmenylethanolamine molecular species, their myeloperoxidase-mediated chlorolipid products and the presence of these chlorolipids in human sepsis. Display omitted •Novel very long chain (VLC) plasmenylethanolamine molecular species are discovered in human neutrophils.•VLC plasmenylethanolamines undergo myeloperoxidase dependent oxidation to produce new VLC chlorinated lipids.•VLC 2-chlorofatty acids are elevated in human sepsis.
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