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Published on: August 4, 2019

Functions of MDMX in the modulation of the p53-response

Kristiaan Lenos1, Aart G Jochemsen

  • 1Department of Molecular Cell Biology, Leiden University Medical Center, Leiden, The Netherlands.

Journal of Biomedicine & Biotechnology
|May 5, 2011
PubMed

Insights

MDMX protein levels are regulated by various stress-induced mechanisms, including posttranslational modifications and alternative splicing. A newly identified p53-MDMX feedback loop also dampens the p53 response.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Genetics

Background:

  • MDM2 and MDMX are critical regulators of the p53 tumor suppressor.
  • Their activity is essential for embryonal development by inhibiting p53.
  • Stress conditions necessitate the downregulation of MDM2 and MDMX to activate p53.

Purpose of the Study:

  • To review mechanisms downregulating MDMX protein levels under stress.
  • To discuss the role of MDMX splice variants in tumor development.
  • To highlight the novel p53-MDMX feedback loop.

Main Methods:

  • Review of existing literature on MDMX regulation.
  • Analysis of posttranslational modifications of MDMX.
  • Investigation of mdmx mRNA expression and alternative splicing.
  • Discussion of experimental evidence for the p53-MDMX feedback loop.

Main Results:

  • MDMX is downregulated through various stress-induced mechanisms.
  • Posttranslational modifications and alternative splicing of MDMX are key regulatory events.
  • MDMX splice variants may play a role in tumor development.
  • A p53-MDMX feedback loop exists, modulating p53 activity after genotoxic stress.

Conclusions:

  • MDMX regulation is complex, involving multiple layers of control.
  • Understanding MDMX regulation and its splice variants is crucial for cancer research.
  • The p53-MDMX feedback loop represents a significant finding in p53 pathway regulation.

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