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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

The coordinate regulation of the p53 and mTOR pathways in cells

Zhaohui Feng1, Haiyan Zhang, Arnold J Levine

  • 1Cancer Institute of New Jersey, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, New Brunswick, NJ 08903, USA.

Proceedings of the National Academy of Sciences of the United States of America
|June 2, 2005
PubMed

Insights

The p53 protein inhibits mTOR signaling, a key pathway in cell growth, and this interaction is crucial for preventing cancer. This cross-talk between p53 and mTOR helps regulate cell growth, proliferation, and death.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Oncology

Background:

  • Cell growth and proliferation depend on balancing stimulatory (nutrients, growth factors) and inhibitory (stresses) signals.
  • Dysregulation of this balance is a hallmark of cancer.
  • The mammalian target of rapamycin (mTOR) pathway integrates nutrient and growth factor signals, while p53 protein responds to cellular stresses.

Purpose of the Study:

  • To investigate the interaction between p53 and mTOR signaling pathways.
  • To elucidate the mechanisms by which p53 influences mTOR activity.
  • To understand the role of this cross-talk in regulating cell growth, proliferation, and tumor suppression.

Main Methods:

  • Activation of p53.
  • Analysis of mTOR activity and downstream targets.
  • Investigation of AMP kinase and TSC1/TSC2 complex involvement.
  • Examination of cellular responses to glucose starvation.

Main Results:

  • p53 activation was found to inhibit mTOR activity.
  • p53 regulates downstream targets of mTOR, including autophagy, a tumor suppressor process.
  • The inhibitory effect of p53 on mTOR involves AMP kinase activation and the TSC1/TSC2 complex.
  • Glucose starvation triggers p53 phosphorylation and mTOR inhibition.
  • p53 and mTOR signaling pathways exhibit cross-talk.

Conclusions:

  • p53 and mTOR signaling pathways are interconnected and coordinately regulate fundamental cellular processes.
  • This cross-talk plays a critical role in tumor suppression by controlling cell growth, proliferation, and death.
  • Understanding this interplay provides insights into cancer development and potential therapeutic strategies.

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