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Updated: Dec 27, 2025

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Wip1 regulates Smad4 phosphorylation and inhibits TGF-β signaling

Dong-Seok Park1, Gang-Ho Yoon1, Eun-Young Kim1

  • 1Department of Biomedical Sciences, University of Ulsan College of Medicine, Seoul, Korea.

EMBO Reports
|February 28, 2020
PubMed

Insights

Wip1 dephosphorylates Smad4, a key protein in TGF-β/BMP signaling, impacting cell behavior and development. This finding reveals a new regulatory mechanism for these crucial biological pathways.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Smad4 is a critical mediator of TGF-β/BMP signaling pathways, vital for development and tissue homeostasis.
  • Mitogen-activated protein kinase (MAPK) phosphorylation of Smad4 regulates its activity and stability, but dephosphorylation roles are unclear.

Purpose of the Study:

  • To identify phosphatases that dephosphorylate Smad4.
  • To elucidate the role of Smad4 dephosphorylation in TGF-β/BMP signaling regulation.

Main Methods:

  • Biochemical assays to identify Smad4 phosphatase activity.
  • Xenopus embryo experiments to assess developmental roles.
  • Human cell line studies to investigate cancer-related functions.

Main Results:

  • Wip1 was identified as a Smad4 phosphatase, selectively dephosphorylating Smad4 at Thr277.
  • Wip1 dephosphorylation of Smad4 affects its nuclear accumulation and stability.
  • In Xenopus, Wip1 inhibits mesoderm formation and promotes neural induction.
  • Wip1 restrains TGF-β-induced growth arrest and migration in human cells, promoting cancer cell tumorigenicity.

Conclusions:

  • Wip1 dephosphorylates Smad4, acting as a key regulator of TGF-β/BMP signaling.
  • Wip1's action on Smad4 influences developmental processes and cancer cell behavior.
  • This study uncovers a novel mechanism controlling TGF-β/BMP signaling through Smad4 dephosphorylation by Wip1.
Keywords:
XenopusSmad4TGF-βWip1phosphatase

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