Regulation of TGF-beta family signaling by E3 ubiquitin ligases

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Updated: Jun 30, 2026

Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells
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Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells

Published on: October 27, 2020

Yasumichi Inoue1, Takeshi Imamura

  • 1Division of Biochemistry, the Cancer Institute of the Japanese Foundation for Cancer Research, Tokyo, Japan.

Cancer Science
|September 24, 2008
PubMed

Insights

E3 ubiquitin ligases regulate transforming growth factor-beta (TGF-beta) signaling by controlling Smad degradation. Dysregulation of these ligases is linked to cancer development and progression.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • Transforming growth factor-beta (TGF-beta) family proteins regulate critical cellular processes like proliferation, differentiation, migration, and apoptosis.
  • Dysregulation of TGF-beta signaling pathways is implicated in various human diseases, notably cancer.
  • TGF-beta signaling involves membrane receptors, intracellular Smad proteins, and the ubiquitin-proteasome system.

Purpose of the Study:

  • To elucidate the role of E3 ubiquitin ligases in regulating TGF-beta family signaling.
  • To identify specific E3 ubiquitin ligases involved in Smad degradation and their impact on TGF-beta pathway activity.
  • To explore the connection between E3 ubiquitin ligase abnormalities and cancer development.

Main Methods:

  • Investigated the function of E3 ubiquitin ligases, including Smad ubiquitin regulatory factors (Smurfs) and Arkadia, in the context of TGF-beta signaling.
  • Examined the mechanisms by which E3 ligases mediate the ubiquitination and degradation of Smad proteins and associated factors (e.g., Smad6, Smad7, c-Ski, SnoN).
  • Analyzed the implications of these regulatory processes for TGF-beta pathway modulation.

Main Results:

  • E3 ubiquitin ligases, such as Smurf1, Smurf2, and Arkadia, play a crucial role in degrading key components of the TGF-beta signaling pathway, including Smad proteins.
  • Smurf1 and Smurf2 facilitate the degradation of inhibitory Smads (Smad6, Smad7) by binding to TGF-beta receptors.
  • Arkadia promotes TGF-beta signaling by inducing ubiquitination and degradation of Smad7 and corepressors c-Ski and SnoN.

Conclusions:

  • The ubiquitin-proteasome pathway, particularly E3 ubiquitin ligases, is a critical regulator of TGF-beta family signaling.
  • Aberrant function of E3 ubiquitin ligases involved in TGF-beta signaling components can contribute to the pathogenesis of various cancers.
  • Targeting E3 ubiquitin ligases may offer potential therapeutic strategies for TGF-beta-related cancers.

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