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Nucleoplasmic mobilization of nucleostemin stabilizes MDM2 and promotes G2-M progression and cell survival

Lingjun Meng1, Tao Lin, Robert Y L Tsai

  • 1Center for Cancer and Stem Cell Biology, Alkek Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, TX 77030, USA.

Journal of Cell Science
|November 27, 2008
PubMed

Insights

Nucleostemin stabilizes MDM2, inhibiting p53 and promoting cell survival during mitosis. Its relocation from the nucleolus to the nucleoplasm during stress safeguards cell division and survival.

Area of Science:

  • Cell Biology
  • Molecular Oncology
  • Cancer Research

Background:

  • Nucleolar disassembly during mitosis and stress releases p53-stabilizing proteins.
  • Nucleostemin is a nucleolar protein found in cancer and stem cells.

Purpose of the Study:

  • To investigate the role of nucleostemin in regulating MDM2 and p53.
  • To understand how nucleostemin's localization affects cell cycle progression and survival.

Main Methods:

  • Assessing MDM2 protein stability and localization.
  • Investigating nucleostemin's interaction with MDM2.
  • Analyzing cell cycle progression and cell death following nucleostemin manipulation.

Main Results:

  • Nucleostemin enhances MDM2 stability and nucleoplasmic retention, competing with L23 for binding.
  • Nucleostemin relocation to the nucleoplasm increases MDM2 stabilization and p53 inhibition.
  • Nucleostemin depletion causes G2-M arrest and cell death in U2OS cells.

Conclusions:

  • Nucleoplasmic relocation of nucleostemin during nucleolar disassembly promotes cell survival.
  • Nucleostemin stabilizes MDM2 and inhibits p53, facilitating G2-M transit in dividing cells.

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