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Updated: May 17, 2026

Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells
06:54

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

Published on: October 27, 2020

DRAK2 participates in a negative feedback loop to control TGF-β/Smads signaling by binding to type I TGF-β receptor

Kyung-Min Yang1, Wonjoo Kim, Eunjin Bae

  • 1CHA Cancer Institute, CHA University of Medicine and Science, Seoul 135-081, Korea.

Cell Reports
|November 6, 2012
PubMed

Insights

Transforming growth factor-beta 1 (TGF-β1) signaling is regulated by DRAK2, a novel antagonist. Aberrant DRAK2 expression in breast cancer promotes tumorigenesis by inhibiting TGF-β1

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Transforming growth factor-beta 1 (TGF-β1) is a key cytokine regulating numerous biological processes.
  • The termination mechanisms of intracellular TGF-β1 signaling remain incompletely understood.
  • Understanding these mechanisms is crucial for deciphering cellular regulation and disease pathogenesis.

Purpose of the Study:

  • To identify novel regulators of TGF-β1 signaling termination.
  • To investigate the role of DRAK2 in TGF-β1 pathway regulation.
  • To explore the implications of DRAK2 in breast cancer development and progression.

Main Methods:

  • Investigated TGF-β1-induced gene expression changes.
  • Utilized co-immunoprecipitation to study protein interactions.
  • Employed siRNA to deplete DRAK2 expression in cell lines.
  • Assessed the impact of DRAK2 on TGF-β1 signaling and breast cancer cell tumorigenicity.

Main Results:

  • TGF-β1 stimulation rapidly upregulates DRAK2 expression.
  • DRAK2 interacts with the TGF-β type I receptor, inhibiting R-Smad recruitment.
  • DRAK2 depletion potentiates TGF-β1 signaling.
  • Elevated DRAK2 expression correlates with basal-like and HER2-enriched breast tumors.
  • DRAK2 depletion reduces breast cancer cell tumorigenic potential.

Conclusions:

  • DRAK2 functions as an intrinsic intracellular antagonist in the TGF-β1 signaling negative feedback loop.
  • Aberrant DRAK2 expression contributes to tumorigenesis by potentially inhibiting TGF-β1's tumor suppressor functions.
  • DRAK2 represents a potential therapeutic target in specific breast cancer subtypes.

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