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Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

Mitogen-activated protein kinase phosphatase 2: a novel transcription target of p53 in apoptosis

Wen Hong Shen1, Jianli Wang, Jingjing Wu

  • 1Department of Radiation Oncology, College of Physicians and Surgeons, Columbia University, New York, New York 10032, USA.

Cancer Research
|June 17, 2006
PubMed

Insights

The tumor suppressor p53 (also known as TP53) targets the MKP2 gene to induce apoptosis. This discovery reveals a new p53 binding site and highlights MKP2

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cellular Signaling

Background:

  • The p53 tumor suppressor is crucial for cellular responses like apoptosis and cell cycle arrest, acting through transcriptional control of target genes.
  • Understanding novel p53 target genes is essential for elucidating its diverse regulatory functions in cellular processes.

Purpose of the Study:

  • To identify and characterize new p53 target genes involved in apoptosis.
  • To investigate the role of mitogen-activated protein kinase phosphatase 2 (MKP2) as a novel p53 target gene in apoptosis signaling.

Main Methods:

  • Identification of MKP2 as a transcription target of p53.
  • Characterization of a novel p53 binding site within the MKP2 promoter.
  • Analysis of MKP2 induction in response to oxidative stress and its dependence on p53.

Main Results:

  • Mitogen-activated protein kinase phosphatase 2 (MKP2) is identified as a novel transcription target of p53, specifically mediating apoptosis.
  • A unique 10-bp GC-rich palindrome (CTGGCGCCAG) in the MKP2 promoter serves as a novel p53 binding site, distinct from the consensus sequence.
  • MKP2 induction by oxidative stress is p53-dependent and prominent in apoptosis, but not cell cycle arrest; ectopic MKP2 enhances apoptosis independently of p53.

Conclusions:

  • p53 utilizes distinct binding mechanisms to regulate different target genes.
  • MKP2 is an essential p53 target gene for signaling apoptosis.
  • MKP2 plays a significant role in promoting apoptotic responses, highlighting its importance in cancer research and therapy.

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