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Transducin β-like protein 1 recruits nuclear factor κB to the target gene promoter for transcriptional activation

Sivakumar Ramadoss1, Jiong Li, Xiangming Ding

  • 1Laboratory of Molecular Signaling, Oral Biology and Medicine, University of California at Los Angeles, Los Angeles, CA 90095-1668, USA.

Molecular and Cellular Biology
|December 30, 2010
PubMed

Insights

Transducin beta-like protein 1 (TBL1) facilitates nuclear factor kappa B (NF-κB) recruitment to target genes, impacting cancer cell invasion. Targeting TBL1 offers a novel strategy for breast cancer therapy by modulating NF-κB activity.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Cancer Research

Background:

  • Nuclear factor kappa B (NF-κB) signaling is crucial for cellular functions, including tumor progression and invasion.
  • NF-κB activation involves nuclear translocation and binding to target gene promoters to induce transcription.
  • The precise mechanism of NF-κB recruitment to gene promoters remains incompletely understood.

Purpose of the Study:

  • To elucidate the role of transducin beta-like protein 1 (TBL1) in NF-κB-mediated gene expression.
  • To investigate TBL1's function in the recruitment of NF-κB to its target gene promoters.
  • To explore the therapeutic potential of targeting TBL1 in breast cancer.

Main Methods:

  • Investigated the interaction between TBL1 and NF-κB using biochemical assays.
  • Utilized gene knockdown techniques to assess the impact of TBL1 on NF-κB recruitment.
  • Analyzed TBL1 mRNA expression in breast cancer tissues using the Oncomine database.
  • Assessed the effect of TBL1 knockdown on breast cancer cell invasion.

Main Results:

  • TBL1 directly binds to NF-κB and facilitates its recruitment to target gene promoters upon stimulation.
  • Tumor necrosis factor alpha stimulation promotes the formation of an NF-κB-TBL1 complex.
  • TBL1 knockdown impairs NF-κB recruitment and reduces the invasive potential of breast cancer cells.
  • Elevated TBL1 mRNA levels correlate with invasive breast cancer phenotypes.

Conclusions:

  • TBL1 plays a critical role in regulating NF-κB target gene expression by mediating NF-κB promoter recruitment.
  • TBL1 is implicated in promoting breast cancer cell invasion.
  • Targeting the NF-κB-TBL1 interaction presents a promising therapeutic strategy for invasive breast cancer.

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