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p53 transactivation is involved in the antiproliferative activity of the putative tumor suppressor RBM5

Takahiko Kobayashi1, Junich Ishida, Manabu Musashi

  • 1Health Administration Center, Hokkaido University, Sapporo, Japan. 1961koba@med.hokudai.ac.jp

International Journal of Cancer
|March 24, 2010
PubMed

Insights

RNA-binding motif protein 5 (RBM5) enhances tumor suppressor p53 activity. RBM5 supports p53

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Genetics

Background:

  • RNA-binding motif protein 5 (RBM5) is a nuclear protein located at the 3p21.3 tumor suppressor locus, frequently altered in lung and other cancers.
  • RBM5 is known to induce apoptosis and cell cycle arrest, but its precise molecular functions remain unclear.
  • The tumor suppressor protein p53 plays a critical role in cellular responses to DNA damage.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying RBM5 function.
  • To determine the relationship between RBM5 and the tumor suppressor protein p53.
  • To elucidate how RBM5 influences p53-mediated cellular processes.

Main Methods:

  • Overexpression and knockdown (shRNA) of RBM5 in cancer cells.
  • Reporter gene assays to assess p53 transcriptional activity.
  • Analysis of mRNA and protein levels of p53 target genes.
  • Investigation of p53 protein levels post-DNA damage.

Main Results:

  • RBM5 overexpression enhanced p53-mediated growth inhibition and colony formation.
  • RBM5 augmented p53 transcriptional activity, increasing target gene expression.
  • RBM5 knockdown decreased p53 activity and target gene expression.
  • RBM5 influenced p53 protein levels post-DNA damage, suggesting post-transcriptional regulation.

Conclusions:

  • RBM5 is crucial for p53 transcriptional activity, particularly after DNA damage.
  • RBM5 contributes to p53-mediated growth suppression and apoptosis.
  • RBM5's role in tumor suppression is linked to its modulation of p53 activity.

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