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NF-κB p65 represses β-catenin-activated transcription of cyclin D1

Injoo Hwang1, Yong Seok Choi, Mi-Ya Jeon

  • 1National Research Lab for RNA Cell Biology, BK21 Graduate Program for RNA Biology, Institute of Nanosensor and Biotechnology and Department of Molecular Biology, Dankook University, Gyeonggi-do 448-701, Republic of Korea.

Biochemical and Biophysical Research Communications
|November 9, 2010
PubMed

Insights

This study reveals that nuclear factor-kappa B (NF-κB) can inhibit beta-catenin

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Gene Regulation

Background:

  • The beta-catenin and NF-κB signaling pathways are crucial in cellular processes.
  • Crosstalk between these pathways is known to exist.
  • Their interaction on shared target genes remains less understood.

Purpose of the Study:

  • To investigate the functional crosstalk between beta-catenin and NF-κB on their common target genes.
  • To elucidate the mechanism of this interaction at the promoter level.

Main Methods:

  • Utilized the cyclin D1 promoter as a model system.
  • Employed gene reporter assays to measure transcriptional activity.
  • Performed chromatin immunoprecipitation to assess protein binding to DNA.

Main Results:

  • Beta-catenin activated transcription from the cyclin D1 promoter.
  • NF-κB p65 significantly reduced beta-catenin-mediated transcription.
  • NF-κB p65 diminished beta-catenin binding to the cyclin D1 promoter, suggesting protein-protein interaction.

Conclusions:

  • NF-κB and beta-catenin exhibit functional crosstalk on shared target genes like cyclin D1.
  • NF-κB can antagonize beta-catenin's transcriptional activity through promoter binding interference.
  • This dynamic interplay is critical for regulating target gene expression.

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