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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

A proinflammatory cytokine inhibits p53 tumor suppressor activity

J D Hudson1, M A Shoaibi, R Maestro

  • 1Unit of Cancer Biology, Institute of Child Health, London WC1N 1EH, United Kingdom.

The Journal of Experimental Medicine
|November 24, 1999
PubMed

Insights

Macrophage migration inhibitory factor (MIF) was found to inactivate the tumor suppressor p53. This discovery links inflammation to tumorigenesis by showing how MIF can overcome p53

Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology

Background:

  • The p53 protein is a critical tumor suppressor involved in regulating cell proliferation, genomic stability, and preventing cancer development.
  • Understanding novel regulators of p53 is crucial for developing new cancer therapies.
  • Macrophage migration inhibitory factor (MIF) is a known proinflammatory cytokine.

Purpose of the Study:

  • To identify novel genes that regulate the function of the p53 tumor suppressor.
  • To investigate the role of macrophage migration inhibitory factor (MIF) in modulating p53 activity.
  • To explore the potential link between inflammation and cancer through the p53-MIF interaction.

Main Methods:

  • Conducted two functional genetic screens to isolate genes that bypass p53-mediated growth arrest or apoptosis.
  • Utilized cDNA screening to identify specific gene products.
  • Assessed the effect of MIF on p53 activity in multiple biological assays and its transcriptional activation function.

Main Results:

  • Two independent functional screens identified macrophage migration inhibitory factor (MIF) as a regulator of p53.
  • MIF treatment effectively overcame p53's tumor-suppressive functions in three distinct biological assays.
  • MIF was shown to suppress the transcriptional activation activity of p53.

Conclusions:

  • Macrophage migration inhibitory factor (MIF) functionally inactivates the p53 tumor suppressor.
  • This finding establishes a molecular link between chronic inflammation and cancer development.
  • Targeting the MIF-p53 interaction could represent a novel therapeutic strategy for cancer.

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