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Perturbation of BRD4 protein function by BRD4-NUT protein abrogates cellular differentiation in NUT midline carcinoma

Junpeng Yan1, Jason Diaz, Jing Jiao

  • 1Department of Microbiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania 19104, USA.

The Journal of Biological Chemistry
|June 10, 2011
PubMed

Insights

NUT midline carcinoma (NMC) is driven by BRD4-NUT fusion, which blocks cell differentiation. This study reveals BRD4-NUT disrupts normal BRD4 function, repressing c-fos and hindering differentiation in aggressive NMC.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • NUT midline carcinoma (NMC) is a lethal epithelial cancer linked to BRD4-NUT gene fusions.
  • The oncogenic mechanism of BRD4-NUT, particularly its effect on cellular differentiation, is not fully understood.

Purpose of the Study:

  • To elucidate the molecular mechanism by which the BRD4-NUT fusion protein contributes to oncogenesis in NMC.
  • To investigate how BRD4-NUT perturbs cellular differentiation pathways.

Main Methods:

  • Cellular localization studies of BRD4-NUT and BRD4.
  • Analysis of histone acetylation and transcriptional activity in nuclear foci.
  • Assessment of c-fos expression and AP-1 activity.
  • BRD4-NUT knockdown experiments in NMC cells.

Main Results:

  • BRD4-NUT and BRD4 colocalize in transcriptionally inactive, hyperacetylated nuclear foci.
  • BRD4-NUT recruits histone acetyltransferases and P-TEFB, leading to c-fos repression.
  • Knockdown of BRD4-NUT disperses these foci, reactivates c-fos expression, and restores differentiation.

Conclusions:

  • BRD4-NUT oncogene blocks epithelial differentiation by disrupting normal BRD4 function and repressing c-fos.
  • This mechanism provides new insights into the aggressive nature of NMC and potential therapeutic targets.

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