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NuMA is required for the selective induction of p53 target genes

Hirokazu Ohata1, Makoto Miyazaki, Ryo Otomo

  • 1Division of Cancer Differentiation, National Cancer Center Research Institute, Chuo-ku, Tokyo, Japan.

Molecular and Cellular Biology
|April 17, 2013
PubMed

Insights

Nuclear mitotic apparatus protein (NuMA) binds to p53, modulating its gene transcription. NuMA is crucial for p53

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • p53 is a tumor suppressor protein regulating gene expression for cell cycle arrest and apoptosis.
  • Nuclear mitotic apparatus protein (NuMA) is known for its role in mitosis and interphase chromatin regulation.
  • The specific function of NuMA during interphase and its interaction with p53 were previously unclear.

Purpose of the Study:

  • To investigate the role of NuMA in p53-mediated transcription.
  • To determine if NuMA influences the target gene selectivity of p53.

Main Methods:

  • p53 and NuMA binding assays.
  • NuMA ablation and knockdown experiments.
  • Analysis of p21 and PUMA gene induction following DNA damage.
  • Investigation of cyclin-dependent kinase 8 (Cdk8) recruitment.

Main Results:

  • NuMA directly binds to p53 and modulates its transcriptional activity.
  • NuMA depletion impairs the induction of the pro-arrest p21 gene but not the pro-apoptotic PUMA gene.
  • NuMA is essential for the recruitment of Cdk8 to p53-regulated genes, particularly p21.

Conclusions:

  • NuMA plays a critical role in the target gene selectivity of p53.
  • NuMA's interaction with p53 influences cell cycle arrest outcomes.
  • NuMA's function in recruiting Cdk8 highlights its importance in regulating p53 transcriptional responses.

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