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Updated: Aug 19, 2026

Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells
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Altered expression of TGF-beta receptors in hepatocellular carcinoma--effects of a constitutively active TGF-beta

Annemarie Musch1, Christian Rabe, Mignon-Denise Paik

  • 1Department of Medicine I, University of Bonn, Germany.

Digestion
|March 19, 2005
PubMed
Abstract

Insights

Hepatocellular carcinoma (HCC) resistance to transforming growth factor-beta (TGF-beta) may stem from reduced TGF-beta receptor II (TGF-betaRII) expression. Restoring TGF-beta receptor I (TGF-betaRI) function in HCC cells decreased proliferation without increasing invasiveness.

Area of Science:

  • Hepatocellular carcinoma (HCC) research
  • Molecular mechanisms of cancer resistance
  • TGF-beta signaling pathway

Background:

  • Hepatocellular carcinoma (HCC) frequently exhibits resistance to transforming growth factor-beta (TGF-beta) signaling.
  • Understanding the molecular basis of this resistance is crucial for developing effective therapies.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying TGF-beta resistance in HCC.
  • To explore strategies for overcoming TGF-beta resistance in HCC.

Main Methods:

  • Analyzing TGF-beta type I and type II receptor (TGF-betaRI/RII) expression in clinical HCCs and hepatoma cell lines (HuH-7, HepG2).
  • Transfecting HuH-7 cells with a constitutively active TGF-betaRI mutant (CA TGF-betaRI).
  • Assessing growth kinetics, integrin expression, invasiveness, PAI-1 promoter activation, and Smad expression in transfected cells.

Main Results:

  • Clinical HCCs showed altered TGF-betaRI/RII protein expression compared to adjacent liver tissue.
  • HuH-7 cells with decreased TGF-betaRII expression exhibited resistance.
  • Stable transfection with CA TGF-betaRI in HuH-7 cells attenuated PAI-1 promoter response, increased Smad7 expression, and decreased proliferation without affecting invasiveness.

Conclusions:

  • Reduced TGF-betaRII protein expression may contribute to TGF-beta resistance in a subset of HCC.
  • Stable expression of CA TGF-betaRI can reverse TGF-beta resistance in HCC cells, offering a potential therapeutic avenue without enhancing invasiveness.

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