SOCS-1 can suppress CD3ζ- and Syk-mediated NF-AT activation in a non-lymphoid cell line

Tadashi Matsuda, Tetsuya Yamamoto, Hiroyuki Kishi, Akihiko Yoshimura, Atsushi Muraguchi

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


To elucidate T cell antigen receptor (TCR) signaling leading to activation nuclear factor of activated T cells (NF-AT), we reconstituted TCR signaling to activate NF-AT in a non-lymphoid cell line, 293T. We demonstrated that co-expression of CD8/ζ and Syk were necessary for NF-AT activation in 293T. This NF-AT response was completely inhibited by the addition of cyclosporin A or FK506, but markedly enhanced by the additional expression of Tec protein tyrosine kinase. We also show that the cytokine signaling suppressor, suppressor of cytokine signaling 1, potently inhibited this response by interacting with Syk and immunoreceptor tyrosine-based activation motifs in CD8/ζ. These results imply that this novel system may provide a useful tool to delineate or identify the regulatory molecules for CD3ζ/Syk-mediated NF-AT activation. Copyright (C) 2000 Federation of European Biochemical Societies.

Original languageEnglish
Pages (from-to)235-240
Number of pages6
JournalFEBS Letters
Issue number2-3
Publication statusPublished - 2000 Apr 28
Externally publishedYes


  • Immunoreceptor tyrosine-based activation motif
  • Nuclear factor of activated T cell
  • Signal transduction
  • Suppressor of cytokine signaling 1
  • Syk
  • T cell antigen receptor

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology


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