Identification of a novel p53 promoter element involved in genotoxic stress-inducible p53 gene expression

Xiangao Sun, Hiroko Shimizu, Ken Ichi Yamamoto

Research output: Contribution to journalArticlepeer-review

94 Citations (Scopus)

Abstract

p53 is recruited in response to DNA-damaging genotoxic stress and plays an important role in maintaining the integrity of the genome. We show that exposure of cells to various genotoxic agents, including anticancer drugs such as mitomycin and 5-fluorouracil, results in an increase in p53 mRNA levels and in p53 promoter activation, indicating that the p53 genotoxic stress response is partly regulated at the transcriptional level. The results of the p53 promoter analysis show that a novel p53 promoter element, termed a p53 core promoter element (from -70 to -46), is essential for basal p53 promoter activity and p53 promoter activation induced by genotoxic agents such as anticancer drugs and UV. Although a κB motif partially overlaps with this element and those genotoxic agents activate NF-κB, it does not play a major role in p53 genotoxic stress response NF-κB p65 expression did not induce significant p53 promoter activation, and NF-κB inhibitors (N-acetyl cysteine and IκBα) did not inhibit genomic stress-inducible p53 promoter activation. Finally, we characterized nuclear factors, the binding of which to the p53 core promoter element is essential for basal p53 promoter activity and p53 promoter activation induced by genotoxic agents.

Original languageEnglish
Pages (from-to)4489-4496
Number of pages8
JournalMolecular and Cellular Biology
Volume15
Issue number8
DOIs
Publication statusPublished - Aug 1995

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

Fingerprint Dive into the research topics of 'Identification of a novel p53 promoter element involved in genotoxic stress-inducible p53 gene expression'. Together they form a unique fingerprint.

Cite this