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Upon antigen recognition by the TCR, both the leukocyte adhesion molecules DNAM-1 and leukocyte function-associated antigen-1 (LFA-1) associate with lipid rafts and form peripheral supra-molecular activation clusters that surround central-supra-molecular activation clusters at the immunological synapse. The serine residue in the cytoplasmic tail of DNAM-1 is responsible for this association of DNAM-1 with lipid rafts. The TCR-mediated signal also induces physical association of DNAM-1 with LFA-1, for which the serine phosphorylation of DNAM-1 is also responsible. However, how the serine residue is involved in lipid raft recruitment of DNAM-1 has remained unclear. Here, we show that, although the TCR-mediated signal induced the serine phosphorylation of DNAM-1, DNAM-1 did not associate with lipid rafts in CD4+ T cells derived from mice deficient in LFA-1 expression, indicating that lipid raft recruitment of DNAM-1 depends on LFA-1 expression. These results suggest that the serine phosphorylation of DNAM-1 primarily induces physical association of DNAM-1 with LFA-1, which then takes DNAM-1 into lipid raft compartment.

LFA-1-dependent lipid raft recruitment of DNAM-1 (CD226) in CD4+ T cell