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Twist1 regulates Ifng expression in Th1 cells by interfering with Runx3 function.

Duy Pham1, Joshua W Vincentz, Anthony B Firulli

  • 1Department of Pediatrics, Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|June 12, 2012
PubMed
Summary

The transcription factor Twist1 negatively regulates Th1 cell differentiation by decreasing key factors like T-bet and Runx3. This reveals a new regulatory loop impacting inflammatory responses.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • T-helper 1 (Th1) cells are crucial for inflammatory immune responses.
  • A known transcription factor network involving STAT4, T-bet, and Runx3 drives Th1 differentiation.
  • The role of other transcription factors in regulating Th1 cell function remains largely undefined.

Purpose of the Study:

  • To investigate the role of the transcription factor Twist1 in regulating Th1 cell differentiation and function.
  • To elucidate the molecular mechanisms by which Twist1 influences the Th1 transcriptional network.

Main Methods:

  • Analysis of gene expression changes in response to Twist1.
  • Investigation of protein-protein interactions between Twist1 and other transcription factors.
  • Chromatin immunoprecipitation assays to assess transcription factor binding.
  • Analysis of chromatin looping within the Interferon-gamma (Ifng) locus.

Main Results:

  • Twist1 acts as a negative regulator, decreasing the expression of T-bet, Runx3, and IL-12Rβ2.
  • Twist1 inhibits Interferon-gamma (IFN-γ) production.
  • Ectopic expression of Runx3, but not T-bet or IL-12Rβ2, can overcome Twist1-mediated inhibition of IFN-γ.
  • Twist1 forms a complex with Runx3, and this interaction is critical for its regulatory function.
  • Twist1 reduces the binding of Runx3 and T-bet to the Ifng locus and decreases chromatin looping.

Conclusions:

  • Twist1 functions as a negative regulator within the Th1 transcriptional network.
  • Twist1 impacts multiple components of Th1 differentiation, including key transcription factors and cytokine production.
  • The findings reveal an IL-12/STAT4-induced negative regulatory loop involving Twist1 and Runx3, offering new insights into Th1 cell regulation.