Cutting Edge: Localization of linker for activation of T cells to lipid rafts is not essential in T cell activation and development.


Journal Article

It has been proposed that upon T cell activation, linker for activation of T cells (LAT), a transmembrane adaptor protein localized to lipid rafts, orchestrates formation of multiprotein complexes and activates signaling cascades in lipid rafts. However, whether lipid rafts really exist or function remains controversial. To address the importance of lipid rafts in LAT function, we generated a fusion protein to target LAT to nonraft fractions using the transmembrane domain from a nonraft protein, linker for activation of X cells (LAX). Surprisingly, this fusion protein functioned well in TCR signaling. It restored MAPK activation, calcium flux, and NFAT activation in LAT-deficient cells. To further study the function of this fusion protein in vivo, we generated transgenic mice that express this protein. Analysis of these mice indicated that it was fully capable of replacing LAT in thymocyte development and T cell function. Our results demonstrate that LAT localization to lipid rafts is not essential during normal T cell activation and development.

Full Text

Duke Authors

Cited Authors

  • Zhu, M; Shen, S; Liu, Y; Granillo, O; Zhang, W

Published Date

  • January 1, 2005

Published In

Volume / Issue

  • 174 / 1

Start / End Page

  • 31 - 35

PubMed ID

  • 15611224

Pubmed Central ID

  • 15611224

International Standard Serial Number (ISSN)

  • 0022-1767

Digital Object Identifier (DOI)

  • 10.4049/jimmunol.174.1.31


  • eng

Conference Location

  • United States