Related Experiment Video

Updated: May 27, 2025

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

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Robust p53 phenotypes and prospective downstream targets in telomerase-immortalized human cells

Jessica J Miciak1,2, Lucy Petrova1, Rhythm Sajwan1

  • 1Department of Radiation Oncology and Molecular Radiation Sciences, Sidney Kimmel Comprehensive Cancer Center, Baltimore, MD 21231, USA.

Oncotarget
|February 19, 2025
PubMed

Insights

Restoring wild-type p53 in cancer cells impedes proliferation and increases sensitivity to radiation. Studying p53 in normal cells reveals novel targets like ALDH3A1 and NECTIN4, crucial for understanding tumor suppression.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Wild-type TP53 is often lost in cancers, hindering studies on its full tumor-suppressive functions.
  • Commonly used cancer models with wild-type TP53 may not fully represent p53's capabilities.
  • Previous models like HCT116 colorectal cancer (CRC) cells, despite wild-type TP53, lack certain p53 phenotypes.

Purpose of the Study:

  • To investigate the functional impact of restoring wild-type p53 in TP53-mutant colorectal cancer cells.
  • To explore p53-dependent phenotypes in a non-cancerous cell line (hTERT-RPE1) to understand p53's broader roles.
  • To identify novel p53 target genes with potential clinical significance in cancer.

Main Methods:

  • Restoration of p53 in the TP53-mutant DLD-1 CRC cell line.
  • Disruption of TP53 in immortalized hTERT-RPE1 cells.
  • Analysis of p53-dependent phenotypes including cell proliferation, senescence, and response to ionizing radiation (IR).
  • Transcriptomic analysis to identify p53-responsive genes.

Main Results:

  • Restoring p53 in DLD-1 cells reduced proliferation, induced senescence, and increased sensitivity to IR.
  • TP53 disruption in hTERT-RPE1 cells revealed significant p53-dependent phenotypes, suggesting p53 loss is selected for during culture.
  • A p53-responsive transcriptome in hTERT-RPE1 cells was identified, serving as a model for diverse experimental systems.
  • Novel p53 targets, including ALDH3A1 (aldehyde detoxification, ROS metabolism) and NECTIN4 (cell adhesion, overexpressed in tumors), were discovered.

Conclusions:

  • Wild-type p53 actively suppresses tumor growth and enhances treatment sensitivity.
  • The hTERT-RPE1 cell line is a valuable model for studying p53 function and identifying novel targets.
  • ALDH3A1 and NECTIN4 represent potential therapeutic targets due to their roles in detoxification, metabolism, and their prevalence in tumors.
Keywords:
ALDH3A1NECTIN4immortalized cellsionizing radiationp53

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