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Techniques to Induce and Quantify Cellular Senescence
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Published on: May 1, 2017

DPY30 regulates pathways in cellular senescence through ID protein expression.

Elisabeth Simboeck1, Arantxa Gutierrez, Luca Cozzuto

  • 1Centre for Genomic Regulation (CRG) and UPF, Department of Gene Regulation, Stem Cells and Cancer, Barcelona, Spain.

The EMBO Journal
|July 23, 2013
PubMed
Summary

DPY30, a histone methyltransferase, is crucial for human cell proliferation. Its depletion triggers cellular senescence by activating cell-cycle inhibitors, revealing a new pathway for senescence bypass.

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Induction and Validation of Cellular Senescence in Primary Human Cells
08:18

Induction and Validation of Cellular Senescence in Primary Human Cells

Published on: June 20, 2018

Area of Science:

  • Cellular and Molecular Biology
  • Epigenetics
  • Cellular Senescence

Background:

  • Cellular senescence is a state of irreversible cell cycle arrest, acting as a defense against cellular stress.
  • Senescent cells remain metabolically active but lose proliferative capacity.
  • Histone modifications play critical roles in regulating gene expression and cellular processes.

Purpose of the Study:

  • To identify key regulators of proliferation potential in human primary cells.
  • To elucidate the role of DPY30 in cellular senescence and proliferation.
  • To understand the molecular mechanisms linking DPY30 to senescence.

Main Methods:

  • Depletion of DPY30 using specific techniques.
  • Assessment of cellular senescence markers (morphology, ROS, SA-β-gal, SAHFs).
  • Chromatin immunoprecipitation (ChIP) to analyze histone modifications (H3K4me3) and protein binding.
  • Analysis of cell-cycle inhibitors (p16INK4a) and transcription factors (ID proteins, ETS1/2).

Main Results:

  • DPY30 depletion induced a severe proliferation defect and a senescent phenotype in human cells.
  • DPY30 depletion reduced H3K4me3 levels but activated CDK inhibitors independently of H3K4me3.
  • DPY30 directly regulates ID proteins, which control ETS1/2 activity, leading to p16INK4a activation and senescence.
  • Restoring ID protein expression partially rescued the DPY30 depletion-induced senescence.

Conclusions:

  • DPY30 is a critical regulator of human cell proliferation and senescence.
  • The DPY30-ID protein-ETS1/2 pathway controls the expression of cell-cycle inhibitors, driving senescence.
  • Targeting DPY30 or its downstream effectors may offer strategies for senescence bypass.