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- W2121008539 abstract "Recent studies point to glycolipid-enriched membrane (GEM) microdomains as the critical sites for TCR-mediated signal transduction. However, whether the TCR complex is localized in the GEM domain is not well-defined. In the present study, we analyzed localization of the TCR–CD3 complex in the GEM domain by isolating the GEM fraction with sucrose density gradient centrifugation. Although 10% of TCRζ chains was localized in the GEM fraction, most of the TCR complexes were excluded from the GEM before and after T cell activation, and the amount of TCRζ in the GEM was not increased after activation. However, the tyrosine-phosphorylated form of TCRζ was strongly concentrated in the GEM fraction upon TCR engagement. A kinetic study revealed that tyrosine phosphorylation of TCRζ occurred initially in the Triton X-100-soluble membrane fraction followed by the accumulation of phosphorylated TCRζ in the GEM. Thus, these results indicate that phosphorylated TCRζ migrates into the GEM domains on T cell activation. We speculate that the GEM microdomains may function as a reservoir of activation signals from triggered TCR." @default.
- W2121008539 created "2016-06-24" @default.
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- W2121008539 date "1999-09-01" @default.
- W2121008539 modified "2023-09-25" @default.
- W2121008539 title "Translocation of tyrosine-phosphorylated TCRζ chain to glycolipid-enriched membrane domains upon T cell activation" @default.
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- W2121008539 doi "https://doi.org/10.1093/intimm/11.9.1395" @default.
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