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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

Role for p53 in selenium-induced senescence

Min Wu1, Ryan T Y Wu, Thomas T Y Wang

  • 1Department of Nutrition and Food Science, University of Maryland, College Park, Maryland 20742, United States.

Journal of Agricultural and Food Chemistry
|October 7, 2011
PubMed

Insights

The tumor suppressor p53 is crucial for selenium-induced cell senescence in normal fibroblasts. Depleting p53 disrupts cell cycle arrest and increases genome instability, highlighting its critical role in this process.

Area of Science:

  • Cellular senescence
  • DNA damage response
  • Cancer prevention

Background:

  • Tumor suppressor p53 and ATM kinase are key in senescence.
  • Selenium compounds activate ATM-dependent senescence in fibroblasts.
  • The role of p53 in selenium-induced senescence requires further investigation.

Purpose of the Study:

  • To investigate the role of p53 in selenium-induced senescence.
  • To determine if p53 is essential for the senescence response to methylseleninic acid (MSeA).

Main Methods:

  • shRNA knockdown to deplete p53 in MRC-5 cells.
  • Methylseleninic acid (MSeA) treatment to induce senescence.
  • Assays for senescence markers (β-galactosidase), cell cycle arrest, and genome instability.
  • Inhibition of ATM and DNA-PK kinases.

Main Results:

  • p53 depletion reduced senescence markers and disrupted cell cycle arrest (S and G2/M phases).
  • p53-depleted cells showed increased sensitivity to MSeA and heightened genome instability.
  • ATM and DNA-PK inhibitors reduced MSeA cytotoxicity in control cells but not in p53-depleted cells.

Conclusions:

  • p53 is essential for inducing senescence in response to selenium compounds in MRC-5 cells.
  • The p53 pathway is critical for mediating the anti-cancer effects of selenium.
  • These findings underscore the importance of p53 in cellular defense mechanisms against genotoxic stress.

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