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Updated: Mar 25, 2026

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NORE1A is a double barreled Ras senescence effector that activates p53 and Rb

Howard Donninger1, Thibaut Barnoud2, Geoffrey J Clark3

  • 1a Department of Medicine , J.G Brown Cancer Center, Molecular Targets Group, University of Louisville , Louisville , KY 40202.

Cell Cycle (Georgetown, Tex.)
|February 27, 2016
PubMed

Insights

Ras oncogene promotes tumor cell senescence, a key barrier to cancer growth. NORE1A acts as a crucial link, connecting Ras signaling to p53 and Rb tumor suppressors to induce this senescence.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cellular Biology

Background:

  • Ras is a potent oncogene driving human tumors but paradoxically induces Oncogene Induced Senescence (OIS).
  • OIS acts as a significant in vivo barrier to Ras-driven transformation.
  • The precise signaling pathways linking Ras to senescence, involving p53 and Rb, are not fully understood.

Purpose of the Study:

  • To elucidate the signaling mechanisms by which Ras promotes senescence.
  • To identify key mediators connecting Ras to the tumor suppressors p53 and Rb.
  • To investigate the role of NORE1A in Ras-mediated senescence.

Main Methods:

  • Investigated Ras effector pathways.
  • Analyzed NORE1A's function in senescence.
  • Examined protein-protein interactions between Ras effectors and tumor suppressors.
  • Assessed post-translational modifications of p53 and Rb.

Main Results:

  • Identified NORE1A as a direct Ras effector and potent senescence inducer.
  • Demonstrated that NORE1A couples Ras signaling to p53 and Rb.
  • Showed NORE1A mediates Ras-controlled post-translational modifications of p53 and Rb.
  • Found NORE1A forms complexes with both p53 and Rb.

Conclusions:

  • NORE1A is a critical component of the Ras senescence machinery.
  • NORE1A acts as the missing link between Ras and the tumor suppressors p53/Rb.
  • Understanding this pathway offers potential therapeutic targets for Ras-driven cancers.
Keywords:
NORE1ARasRbp53senescence

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