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TAp73 transcriptionally represses BNIP3 expression

Varvara Petrova1, Mara Mancini, Massimiliano Agostini

  • 1a Medical Research Council; Toxicology Unit; Leicester University ; Leicester , UK.

Cell Cycle (Georgetown, Tex.)
|May 8, 2015
PubMed

Insights

Tumor suppressor TAp73 directly inhibits BNIP3 gene expression. Upregulated BNIP3 in lung cancer correlates with poorer survival, suggesting TAp73

Area of Science:

  • Molecular biology
  • Cancer research
  • Tumor suppressors

Background:

  • TAp73, a p53 family member, acts as a tumor suppressor.
  • TAp73 alterations can impair DNA damage response, cell cycle arrest, and apoptosis.
  • TAp73 deficiency promotes angiogenesis via hypoxia-inducible factor (HIF) signaling.

Purpose of the Study:

  • To investigate the role of TAp73 in regulating BNIP3 expression.
  • To explore the association between BNIP3 and lung cancer progression and patient survival.

Main Methods:

  • Analysis of TAp73's direct binding to the BNIP3 gene promoter.
  • Examination of human lung cancer datasets for BNIP3 expression levels.
  • Correlation analysis between BNIP3 expression and patient survival rates.

Main Results:

  • TAp73 directly suppresses the expression of BNIP3 by binding to its promoter.
  • BNIP3 is significantly upregulated in human lung cancer.
  • Elevated BNIP3 expression is directly associated with reduced survival rates in lung cancer patients.

Conclusions:

  • BNIP3 is a novel transcriptional target of TAp73.
  • TAp73's suppression of BNIP3 contributes to its tumor-suppressive function, potentially by antagonizing HIF signaling.
  • BNIP3 may serve as a prognostic biomarker in lung cancer.
Keywords:
HIFautophagylung cancerp53p73

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