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Updated: Jun 16, 2026
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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
Summary
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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