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Role of the TAK1-NLK-STAT3 pathway in TGF-beta-mediated mesoderm induction

Bisei Ohkawara1, Kyoko Shirakabe, Junko Hyodo-Miura

  • 1Department of Molecular Cell Biology, Medical Research Institute and School of Biomedical Science, Tokyo Medical and Dental University, and CREST, JST, Kanda-Surugadai, Chiyoda, Tokyo 101-0062, Japan.

Genes & Development
|March 9, 2004
PubMed

Insights

Transforming growth factor-beta (TGF-β)-activated kinase 1 (TAK1) and Nemo-like kinase (NLK) are crucial for mesoderm induction in Xenopus embryos. Their cascade directly phosphorylates STAT3, a key step in TGF-β signaling.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Cell Signaling

Background:

  • Transforming growth factor-beta (TGF)-beta-activated kinase 1 (TAK1) and Nemo-like kinase (NLK) are known developmental regulators in various species.
  • STAT3 is a signal transducer and activator of transcription involved in cellular responses.

Purpose of the Study:

  • To investigate the role of the TAK1-NLK signaling cascade in TGF-β-mediated mesoderm induction in Xenopus embryos.
  • To determine if serine phosphorylation of STAT3 by TAK1-NLK is essential for this process.

Main Methods:

  • Depletion of TAK1, NLK, or STAT3 using molecular biology techniques.
  • Coexpression of NLK and STAT3 to assess mesoderm induction.
  • Analysis of STAT3 serine phosphorylation levels.
  • Investigating the effect of Activin on NLK activity.

Main Results:

  • Depletion of TAK1, NLK, or STAT3 inhibited TGF-β-mediated mesoderm induction.
  • Coexpression of NLK and STAT3 induced mesoderm, dependent on STAT3 serine phosphorylation.
  • Activin activated NLK, which directly phosphorylated STAT3.
  • TAK1 or NLK depletion reduced endogenous STAT3 serine phosphorylation.

Conclusions:

  • The TAK1-NLK-STAT3 signaling cascade is essential for TGF-β-mediated mesoderm induction in Xenopus embryos.
  • This pathway functions through the direct serine phosphorylation of STAT3 by NLK.

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