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Physically distinct cholesterol/sphingolipid-rich plasma membrane microdomains, so-called lipid rafts, have been recognized to play an important regulatory role in various cellular processes, from membrane trafficking to signal transduction, in a number of cell types. We report here that the ability of TCR on activated, functional CD8+ T lymphocytes to efficiently bind MHC class I tetramer complexes is dependent on the integrity of lipid rafts on the T lymphocyte membrane. We further provide evidence that TCR interact (associate) with lipid raft elements on the T cell surface before receptor engagement and that the topological arrangement of TCR on the cell surface is likewise influenced by lipid raft integrity.

Cutting Edge: Lipid Raft Integrity Affects the Efficiency of MHC Class I Tetramer Binding and Cell Surface TCR Arrangement on CD8+ T Cells