Sphingomyelin depletion inhibits CXCR4 dynamics and CXCL12-mediated directed cell migration in human T cells
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ABSTRACT: Sphingolipids, ceramides and cholesterol are integral components of cellular membranes, and they also play important roles in signal transduction by regulating the dynamics of membrane receptors through their effects on membrane fluidity. Here, we combined biochemical and functional assays with single-molecule dynamic approaches to demonstrate that the local lipid environment regulates CXCR4 organization and function and modulates chemokine-triggered directed cell migration. Prolonged treatment of T cells with neutral sphingomyelinase promoted the complete and sustained breakdown of sphingomyelins and the accumulation of the corresponding ceramides, which altered both membrane fluidity and CXCR4 nanoclustering and dynamics. Under these conditions CXCR4 retained some CXCL12-mediated signaling activity but failed to promote efficient directed cell migration. Our data underscore a critical role for the local lipid composition at the cell membrane in regulating the lateral mobility of chemokine receptors, and their ability to dynamically increase receptor density at the leading edge to promote efficient cell migration
ORGANISM(S): Human Homo Sapiens
TISSUE(S): Hek Cells
SUBMITTER: Carolina Gonzalez-Riano
PROVIDER: ST002150 | MetabolomicsWorkbench | Fri Apr 22 00:00:00 BST 2022
REPOSITORIES: MetabolomicsWorkbench
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