An evolutionary-conserved VPS34-PIKfyve-TRPML1-Myosin II axis regulates the speed of amoeboid cell migration

Abstract

AbstractAmoeboid cell migration is key to efficient T cell immunity. Spatial polarization of organelles within cells, including endo-lysosomes, is a prerequisite of migration. However, how ultrastructural polarization is linked to the signaling requirements governing T cell migration, remains unknown. Here we show that signaling molecules generated by endo-lysosome-localized kinases regulate velocity of amoeboid migration. Specifically, imaging of T cells identified accumulation of endo-lysosomes decorated with the lipid kinases VPS34–PIKfyve at the uropod of polarized cells. Activity of VPS34 and PIKfyve regulated speed, but not directedness, of migrating T cells. Mechanistically, PI(3,5)P2generated by the sequential action of VPS34 and PIKfyve mediated Ca2+efflux from lysosomes via the mucolipin TRP cation channel 1 (TRPML1), thus controlling activity of myosin IIA and hence the generation of propulsive force through retrograde actin flow. The VPS34–PIKfyve kinases also regulated velocity of myeloid cells, as well as of the amoebaDictyostelium discoideum– establishing the axis as an evolutionary conservedspeed control systemof amoeboid cell migration.Graphical AbstractThe VPS34–PIKfyve axis is active on endo-lysosomes at the uropod of migrating T cells.VPS34 and PIKfyve promote myosin IIA activation and retrograde action flow.Amoeboid cell migration speed is controlled by VPS34 and PIKfyve via TRPML1.Regulation of amoeboid migration speed is a conserved function of the VPS34–PIKfyve axis.