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Nuclear receptor TLX inhibits TGF-β signaling in glioblastoma

Erik Johansson1, Qiwei Zhai1, Zhao-Jun Zeng2

  • 1Sahlgrenska Cancer Center at the Sahlgrenska Academy, University of Gothenburg, Box 425, SE 405 30 Gothenburg, Sweden.

Experimental Cell Research
|April 7, 2016
PubMed

Insights

TLX maintains neuronal stemness and is highly expressed in glioblastoma. We found TLX interacts with Smurf1, stabilizing it and promoting TGF-β receptor degradation, thus regulating glioblastoma stem cell properties.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cancer Research

Background:

  • TLX (NR2E1) is an orphan nuclear receptor crucial for neuronal stem cell stemness.
  • TLX is highly expressed in glioblastoma multiforme (GBM), a highly malignant brain tumor.
  • Transforming Growth Factor-β (TGF-β) signaling is dysregulated in glioblastoma and plays complex roles in cancer.

Purpose of the Study:

  • To investigate the interaction between TLX and TGF-β signaling in glioblastoma cells.
  • To elucidate the molecular mechanisms underlying this interaction and its impact on glioblastoma stem/progenitor cells.

Main Methods:

  • Utilized knockdown of TLX in glioblastoma cell lines.
  • Investigated protein-protein interactions between TLX and Smurf1.
  • Assessed the ubiquitination and degradation of TGF-β receptor II.
  • Analyzed Smad2/3 nuclear translocation and TGF-β target gene expression.

Main Results:

  • Knockdown of TLX enhances canonical TGF-β signaling.
  • TLX physically interacts with and stabilizes Smurf1.
  • TLX knockdown leads to stabilization of TGF-β receptor II, increased Smad2/3 nuclear translocation, and enhanced TGF-β target gene expression.

Conclusions:

  • TLX regulates glioblastoma stemness by modulating TGF-β signaling through Smurf1 stabilization.
  • The TLX-TGF-β interaction is a potential therapeutic target for glioblastoma.
  • Understanding this crosstalk is vital for controlling glioblastoma proliferation and tumor-initiating properties.
Keywords:
Smurf1TGF-βTGF-β receptor IITLXglioblastoma

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