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NF-kappaB activation by tumour necrosis factor requires the Akt serine-threonine kinase.

Activation of the nuclear transcription factor NF-kappaB by inflammatory cytokines requires the successive action of NF-kappaB-inducing kinase (NIK) and an IKB-kinase (IKK) complex composed of IKKalpha and IKKbeta. Here we show that the Akt serine-threonine kinase is involved in the activation of NF-kappaB by tumour necrosis factor (TNF). TNF activates phosphatidylinositol-3-OH kinase (PI(3)K) and its downstream target Akt (protein kinase B). Wortmannin (a PI(3)K inhibitor), dominant-negative PI(3)K or kinase-dead Akt inhibits TNF-mediated NF-kappaB activation. Constitutively active Akt induces NF-kappaB activity and this effect is blocked by dominant-negative NIK. Conversely, NIK activates NF-kappaB and this is blocked by kinase-dead Akt. Thus, both Akt and NIK are necessary for TNF activation of NF-kappaB. Akt mediates IKKalpha phosphorylation at threonine 23. Mutation of this amino acid blocks phosphorylation by Akt or TNF and activation of NF-kappaB. These findings indicate that Akt is part of a signalling pathway that is necessary for inducing key immune and inflammatory responses.

Pubmed ID: 10485710

Authors

  • Ozes ON
  • Mayo LD
  • Gustin JA
  • Pfeffer SR
  • Pfeffer LM
  • Donner DB

Journal

Nature

Publication Data

September 2, 1999

Associated Grants

None

Mesh Terms

  • 3T3 Cells
  • Amino Acid Sequence
  • Animals
  • Antigens, CD
  • Cell Line
  • DNA
  • Enzyme Activation
  • HeLa Cells
  • Humans
  • I-kappa B Kinase
  • Mice
  • Molecular Sequence Data
  • NF-kappa B
  • Phosphatidylinositol 3-Kinases
  • Phosphorylation
  • Protein Binding
  • Protein-Serine-Threonine Kinases
  • Proto-Oncogene Proteins
  • Proto-Oncogene Proteins c-akt
  • Receptors, Tumor Necrosis Factor
  • Receptors, Tumor Necrosis Factor, Type I
  • Signal Transduction
  • Threonine
  • Tumor Necrosis Factor-alpha