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TAK1-JNK axis mediates survival signal through Mcl1 stabilization in activated T cells

Yasuko Hirata1, Ayano Sugie, Akio Matsuda

  • 1Department of Microbiology and Immunology, Keio University School of Medicine, Tokyo 160-8582, Japan.

Journal of Immunology (Baltimore, Md. : 1950)
|April 3, 2013
PubMed

Insights

Transforming growth factor-beta-activated kinase 1 (TAK1) is crucial for T cell activation via MAPK signaling. Blocking TAK1-JNK pathways induces apoptosis in activated T cells by inhibiting Mcl1 stabilization, offering a therapeutic strategy.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Transforming growth factor-beta-activated kinase 1 (TAK1) is a key regulator in the MAP kinase kinase kinase (MAPKK-K) family.
  • TAK1 activates downstream signaling pathways including JNK, p38 MAPK, and NF-κB.
  • While TAK1's role in T cell function is established, its specific downstream mediators require elucidation.

Purpose of the Study:

  • To investigate the precise functions of TAK1 downstream mediators in T cell activation and survival.
  • To determine the role of the TAK1-JNK pathway in T cell signaling and apoptosis.
  • To explore the potential of targeting the TAK1 pathway for T cell-based therapies.

Main Methods:

  • Utilized the chemical compound LL-Z1640-2 to selectively inhibit MAPK activation downstream of TAK1.
  • Assessed the impact of LL-Z1640-2 on T cell proliferation, activation, and apoptosis.
  • Analyzed the involvement of caspases and caspase-activated DNase in LL-Z1640-2-induced apoptosis.
  • Investigated the TAK1-JNK pathway's role in interleukin-2 receptor (IL-2R) signaling and Mcl1 protein stabilization.

Main Results:

  • LL-Z1640-2 effectively blocked T cell receptor (TCR)-induced T cell proliferation and activation, confirming the necessity of TAK1-mediated MAPK signaling.
  • The compound induced apoptosis in activated mouse splenic T cells in a caspase- and caspase-activated DNase-dependent manner.
  • The TAK1-JNK pathway, activated downstream of IL-2R, phosphorylates and stabilizes the antiapoptotic protein Mcl1 in activated T cells.
  • Inhibition of the TAK1-JNK pathway leads to the elimination of activated T cells via apoptosis.

Conclusions:

  • The TAK1-JNK pathway, downstream of IL-2R, mediates T cell survival through Mcl1 stabilization.
  • Targeting the TAK1-JNK pathway offers a strategy to induce apoptosis in activated T cells.
  • This study highlights the critical role of TAK1-mediated MAPK signaling in T cell activation and survival.

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