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Transcriptional repression of the tumor suppressor DRO1 by AIB1

Juan Ferragud1, Alvaro Avivar-Valderas, Antoni Pla

  • 1Laboratory of Cellular and Molecular Biology, Centro de Investigación Príncipe Felipe (CIPF), Valencia, Spain.

FEBS Letters
|August 30, 2011
PubMed

Insights

Tumor suppressor DRO1 is repressed by AIB1, inhibiting apoptosis. Restoring DRO1 levels may offer a novel therapeutic strategy against AIB1-driven cancers.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Amplification of Integrated Biallelic protein 1 (AIB1) is implicated in various cancers.
  • The tumor suppressor DRO1's role in AIB1-mediated oncogenesis is not well understood.

Purpose of the Study:

  • To investigate the regulatory relationship between AIB1 and DRO1.
  • To elucidate the mechanism by which AIB1 influences apoptosis.

Main Methods:

  • Transcriptomic gene expression profiling
  • Reporter assays
  • Ectopic expression and silencing studies
  • Immunofluorescence microscopy

Main Results:

  • AIB1 was found to repress DRO1 expression and its promoter activity.
  • DRO1 levels inversely correlated with AIB1 in cancer cell lines.
  • DRO1 overexpression led to BCLAF1 upregulation and facilitated apoptosis.
  • DRO1 shuttles to the endoplasmic reticulum upon apoptotic stimuli.

Conclusions:

  • DRO1 acts as a tumor suppressor targeted by AIB1.
  • AIB1 inhibits apoptosis by repressing DRO1.
  • Targeting the AIB1-DRO1 axis presents a potential therapeutic avenue.

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