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Updated: Dec 26, 2025

Detection of Signaling Effector-Complexes Downstream of BMP4 Using in situ PLA, a Proximity Ligation Assay
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Controlling Smad4 signaling with a Wip

Peter Ten Dijke1, David Baker1

  • 1Department Cell and Chemical Biology, Oncode Institute, Leiden University Medical Center, Leiden, The Netherlands.

EMBO Reports
|March 20, 2020
PubMed

Insights

Wild-type p53-induced phosphatase 1 (Wip1) negatively regulates transforming growth factor-β (TGF-β) signaling. Wip1 dephosphorylates Smad4 at Thr277, a key site controlling TGF-β pathway activity.

Area of Science:

  • Cellular signaling pathways
  • Molecular biology
  • Signal transduction

Background:

  • Transforming growth factor-β (TGF-β) family signaling is crucial for development and tissue homeostasis.
  • Dysregulation of TGF-β signaling is implicated in various diseases.
  • Intracellular Smad proteins mediate TGF-β family signals and are regulated by phosphorylation.

Discussion:

  • Park et al. identify wild-type p53-induced phosphatase 1 (Wip1) as a novel negative regulator of TGF-β family signaling.
  • Wip1 directly dephosphorylates Smad4 at the Thr277 site.
  • This dephosphorylation event occurs at an activating MAP kinase phosphorylation site in Smad4's linker region.

Key Insights:

  • Wip1 acts as a critical brake on TGF-β family signaling.
  • The phosphatase activity of Wip1 on Smad4's Thr277 site is a key mechanism for controlling pathway flux.
  • This finding reveals a new layer of regulation within the Smad-mediated signaling cascade.

Outlook:

  • Understanding Wip1's role in TGF-β signaling may offer new therapeutic targets for diseases associated with pathway dysregulation.
  • Further research could explore the upstream regulation of Wip1 in the context of TGF-β signaling.
  • Investigating the interplay between Wip1 and other Smad-modifying enzymes could elucidate broader signaling network dynamics.

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