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Updated: Aug 8, 2026

High-throughput Quantitative Real-time RT-PCR Assay for Determining Expression Profiles of Types I and III Interferon Subtypes
10:00

High-throughput Quantitative Real-time RT-PCR Assay for Determining Expression Profiles of Types I and III Interferon Subtypes

Published on: March 24, 2015

Y-box protein-1 is the crucial mediator of antifibrotic interferon-gamma effects

Steven Dooley1, Harun M Said, Axel M Gressner

  • 1Institute of Clinical Chemistry and Pathobiochemistry, University Hospital Aachen, RWTH-Aachen, Germany. steven.dooley@med.ma.uni-heidelberg.de

The Journal of Biological Chemistry
|November 10, 2005
PubMed

Insights

Y-box protein-1 (YB-1) activates Smad7 via Jak1 signaling, reducing collagen expression. This interferon-gamma-mediated pathway offers an antifibrotic mechanism by interfering with TGF-beta signaling.

Area of Science:

  • Molecular Biology
  • Immunology
  • Cell Signaling

Background:

  • Y-box protein-1 (YB-1) is recognized as a negative regulator of collagen (Col) expression.
  • YB-1 exerts its regulatory function through direct promoter binding or interaction with p300/Smad3, inhibiting transforming growth factor-beta (TGF-beta) signaling.

Purpose of the Study:

  • To investigate the role of YB-1 in interferon-gamma (IFN-γ)-dependent gene regulation.
  • To elucidate the mechanism by which YB-1 mediates antifibrotic effects.

Main Methods:

  • Analysis of YB-1 activation through the Jak1 signaling pathway.
  • Chromatin immunoprecipitation assays to assess YB-1 binding to the smad7 promoter.
  • Reporter gene assays to quantify gene expression.
  • Overexpression studies to evaluate the impact on TGF-beta signaling and collagen expression.

Main Results:

  • YB-1 activation via Jak1 signaling is essential and sufficient for IFN-γ-dependent activation of the smad7 gene.
  • YB-1 binds to the smad7 promoter, up-regulating its transcription, an effect additively enhanced by TGF-beta signaling.
  • YB-1 overexpression inhibits TGF-beta-induced collagen expression, demonstrating an anti-TGF-beta effect independent of Smad7 induction.

Conclusions:

  • YB-1 is a key mediator of IFN-γ signaling through Jak1, exhibiting antifibrotic properties.
  • YB-1 exerts antifibrotic action by both inhibiting TGF-beta signaling and directly down-regulating collagen expression.

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