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E2F and Ras synergize in transcriptionally activating p14ARF expression

Eli Berkovich1, Yocheved Lamed, Doron Ginsberg

  • 1Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovat, Israel.

Cell Cycle (Georgetown, Tex.)
|April 16, 2003
PubMed

Insights

Oncogenic Ras and E2F1 synergize to activate the tumor suppressor p14ARF, even through non-canonical binding sites. This complex regulation of p14ARF highlights its role in cancer. Keywords: p14ARF, tumor suppressor, oncogenic Ras, E2F1.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cellular Biology

Background:

  • The INK4a/ARF locus encodes tumor suppressors p16INK4a and ARF, crucial for preventing cancer.
  • ARF regulates the p53 pathway by inhibiting mdm2 and also suppresses proliferation independently of p53.
  • ARF expression is induced by oncogenic stimuli like E2F1.

Purpose of the Study:

  • To investigate the regulation of p14ARF expression by oncogenic Ras and E2F1.
  • To understand the synergistic effects of Ras and E2F1 on p14ARF activation.
  • To explore the mechanisms of p14ARF promoter activation, including non-canonical pathways.

Main Methods:

  • Analysis of p14ARF expression in human cells under oncogenic stimuli.
  • Reporter assays to study p14ARF promoter activity.
  • Investigation of E2F-binding sites and transcription factor requirements (E2F, Sp-1).

Main Results:

  • Oncogenic Ras activates p14ARF in cells with deregulated E2F, but not in normal cells.
  • Oncogenic Ras and E2F1 exhibit synergy in activating p14ARF expression.
  • p14ARF promoter activation by E2F1 occurs via both canonical and non-canonical binding sites.
  • Ras-mediated activation requires both E2F and Sp-1 transcription factors.

Conclusions:

  • The regulation of the tumor suppressor p14ARF is complex and involves the interplay of oncogenic Ras, E2F1, and Sp-1.
  • Synergistic activation of p14ARF by oncogenic stimuli suggests a critical role in tumor suppression.
  • Non-canonical promoter activation pathways contribute to the intricate control of p14ARF expression.

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