Dynamic neutrophil lipidome remodeling during induction of NETosis
Neutrophil Extracellular Trap formation (NETosis) affects a wide variety of clinically relevant human diseases. Although lipid remodeling is essential for neutrophil function and membrane rupture during NETosis, the neutrophil lipidome and its dynamics have not been characterized. Thus, we establish the first quantitative lipidome of human neutrophils comprising 1,039 species across nine orders of magnitude and map its remodeling during NETosis. NET formation caused profound alterations in the phosphatidylinositol, phosphatidic acid, diacylglycerol and lysoglycerophospholipid levels. Calcium- and reactive oxygen species-dependent NETosis pathways displayed distinct lipidomic trajectories, yet converged on the significance of phospholipid lipase networks. Pharmacological inhibition of this networks altered lipid composition and markedly impaired NETosis, while diacylglycerol (DG) treatment revoked the effect. Altogether our findings reveal lipid remodeling as a fundamental determinant of NETosis and identify interconnected and dependent phospholipid lipase networks with downstream DG-dependent signaling as a potential therapeutic target in NET-associated diseases.