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00925njm 22002777a 4500 dc Rubio, Julio M. author Astudillo del Valle, Alma María author Casas Requena, Javier author Balboa García, María Ángeles author Balsinde Rodríguez, Jesús author 2018 Macrophages, as professional phagocytes of the immune system, possess the ability to detect and clear invading pathogens and apoptotic cells through phagocytosis. Phagocytosis involves membrane reorganization and remodeling events on the cell surface, which play an essential role in innate immunity and tissue homeostasis and the control of inflammation. In this work we report that cells deficient in membrane ethanolamine plasmalogen demonstrate a reduced capacity to phagocytize opsonized zymosan particles. Amelioration of plasmalogen deficiency in these cells by incubation with lysoplasmalogen results in a significant augmentation of the phagocytic capacity of the cells. In parallel with these increases, restoration of plasmalogen levels in the cells also increases the number and size of lipid rafts in the membrane, reduces membrane fluidity down to levels found in cells containing normal plasmalogen levels, and improves receptor-mediated signaling. Collectively, these results suggest that membrane plasmalogen level determines characteristics of the plasma membrane such as fluidity and the formation of microdomains that are necessary for efficient signal transduction leading to optimal phagocytosis by macrophages. Frontiers in Immunology 9:445. https://doi.org/10.3389/fimmu.2018.01723 https://uvadoc.uva.es/handle/10324/64303 10.3389/fimmu.2018.01723 Frontiers in Immunology 9 1664-3224 Regulation of Phagocytosis in Macrophages by Membrane Ethanolamine Plasmalogens