Related Experiment Video

Updated: Sep 24, 2025

Technique for Obtaining Mesenchymal Stem Cell from Adipose Tissue and Stromal Vascular Fraction Characterization in Long-Term Cryopreservation
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Technique for Obtaining Mesenchymal Stem Cell from Adipose Tissue and Stromal Vascular Fraction Characterization in Long-Term Cryopreservation

Published on: December 30, 2021

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Cleaved to keep dying cells alive

Leslie K Ferrarelli1

  • 1Science Signaling, AAAS, Washington, DC 20005, USA.

Science Signaling
|May 10, 2022
PubMed

Insights

DNA damage triggers caspase-3 activation, which directs the kinase AMP-activated protein kinase (AMPK) into the nucleus. This nuclear translocation of AMPK is crucial for inhibiting apoptosis and promoting cell survival.

Area of Science:

  • Cellular biology
  • Molecular mechanisms of DNA damage response
  • Apoptosis regulation

Background:

  • DNA damage is a critical event that can lead to cell death.
  • Caspase-3 is a key executioner caspase in apoptosis.
  • AMP-activated protein kinase (AMPK) is a cellular energy sensor involved in various stress responses.

Purpose of the Study:

  • To investigate the role of caspase-3 in the cellular response to DNA damage.
  • To elucidate the involvement of AMPK in the DNA damage-induced apoptotic pathway.
  • To determine the subcellular localization of AMPK upon DNA damage.

Main Methods:

  • Cellular models treated with DNA-damaging agents.
  • Western blotting to detect protein activation and localization.
  • Immunofluorescence microscopy to visualize subcellular protein distribution.

Main Results:

  • DNA damage induced caspase-3 activation.
  • Activated caspase-3 was found to interact with and facilitate the nuclear translocation of AMPK.
  • Nuclear AMPK inhibited pro-apoptotic factors, thereby preventing cell death.

Conclusions:

  • Caspase-3 plays a novel role in regulating AMPK localization during DNA damage.
  • Nuclear AMPK acts as a protective factor against apoptosis.
  • This pathway represents a new mechanism for cellular survival following DNA damage.

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