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Techniques to Induce and Quantify Cellular Senescence
06:51

Techniques to Induce and Quantify Cellular Senescence

Published on: May 1, 2017

DNA damage response links calpain to cellular senescence

Francesca Demarchi1, Francesca Cataldo, Cosetta Bertoli

  • 1L.N.C.I.B. Laboratorio Nazionale Consorzio Interuniversitario Biotecnologie AREA Science Park, Trieste, Italy. francesca.demarchi@lncib.it

Cell Cycle (Georgetown, Tex.)
|January 29, 2010
PubMed

Insights

Calpain small subunit 1 (CAPNS1) depletion hinders cellular senescence and DNA damage response. This study reveals a new connection between calpain, senescence, and DNA repair mechanisms.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Oncology

Background:

  • Cellular senescence is a critical mechanism preventing cancer development.
  • The role of calpains in senescence and DNA damage response is not fully understood.

Purpose of the Study:

  • To investigate the function of CAPNS1 in cellular senescence induction.
  • To determine the effect of CAPNS1 depletion on DNA damage response pathways.

Main Methods:

  • Utilized human fibroblast cell lines (BJ-ET, HT1080) and osteosarcoma cells (U2OS, MDA-MB-231).
  • Induced senescence using H-Ras(v12) expression or doxorubicin treatment.
  • Applied genotoxic stress with doxorubicin, MMC, UV, camptothecin, and bleomycin.
  • Assessed H2AX phosphorylation (gamma-H2AX) as a marker of DNA damage.

Main Results:

  • CAPNS1 depletion impaired senescence induction in response to Ras activation and doxorubicin.
  • CAPNS1 depletion reduced H2AX phosphorylation in various cell types under genotoxic stress.
  • Specific effects on gamma-H2AX appearance/persistence were observed in U2OS, HT1080, and MDA-MB-231 cells.

Conclusions:

  • CAPNS1 plays a significant role in regulating cellular senescence.
  • CAPNS1 is involved in the DNA damage response pathway, specifically affecting H2AX phosphorylation.
  • This study establishes a novel link between calpain activity, cellular senescence, and DNA damage response.

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