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Cross-talk between IFN-alpha and TGF-beta1 signaling pathways in preneoplastic rat liver

María De Luján Alvarez1, Ariel D Quiroga, Juan P Parody

  • 1Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET), Facultad de Ciencias Bioquimicas y Farmaceuticas, Instituto de Fisiologia Experimental, Universidad Nacional de Rosario, Rosario, Argentina.

Growth Factors (Chur, Switzerland)
|November 13, 2008
PubMed

Insights

Interferon-alpha (IFN-alpha) and transforming growth factor-beta (TGF-beta) signaling pathways interact positively. This cross-talk involves Stat1 and Smad2/3 interacting with p300 in preneoplastic liver cells.

Area of Science:

  • Immunology
  • Cellular Biology
  • Hepatology

Background:

  • Interferon-gamma (IFN-gamma) and transforming growth factor-beta (TGF-beta) pathways exhibit opposing cellular effects.
  • Limited understanding exists regarding the interplay between interferon-alpha (IFN-alpha) and TGF-beta signaling.
  • Previous research indicated IFN-alpha2b enhances TGF-beta(1) production in preneoplastic rat hepatocytes.

Purpose of the Study:

  • To investigate the interaction between IFN-alpha and TGF-beta(1) signaling pathways.
  • To elucidate the molecular mechanisms underlying this cross-talk in preneoplastic liver cells.

Main Methods:

  • Analysis of signaling pathway activation in hepatocytes from preneoplastic rat livers.
  • Assessment of protein interactions, including Stat1, Smad2/3, and p300.
  • Evaluation of TGF-beta receptor type II (TGF-betaRII) expression at protein and mRNA levels.

Main Results:

  • A positive cross-talk was observed between IFN-alpha and TGF-beta(1) signaling, leading to the activation of both pathways.
  • Hepatocytes from preneoplastic livers possess sufficient p300 protein to interact with activated Stat1 and Smad2/3.
  • Smad7 was found to be unrelated to TGF-beta(1) and IFN-alpha signaling.
  • Autocrine TGF-beta(1) was shown to up-regulate TGF-betaRII at both protein and mRNA levels.

Conclusions:

  • Intracellular signals from IFN-alpha2b and autocrine TGF-beta(1) are integrated at the nuclear level.
  • Activated Stat1 and Smad2/3 can interact with p300, which is present in abundant amounts in these cells.

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