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Simultaneous Imaging and Flow-Cytometry-based Detection of Multiple Fluorescent Senescence Markers in Therapy-Induced Senescent Cancer Cells
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Mitochondrial DNA damage induces apoptosis in senescent cells

R-M Laberge1, D Adler, M DeMaria

  • 1Buck Institute for Research on Aging, Novato, CA, USA.

Cell Death & Disease
|July 23, 2013
PubMed

Insights

Researchers developed a novel method to control cellular senescence using ganciclovir (GCV) and herpes simplex virus thymidine kinase (HSVtk). This system can selectively induce or eliminate senescent cells, offering new therapeutic possibilities for aging and cancer.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biotechnology

Background:

  • Cellular senescence, a state of irreversible growth arrest, plays a dual role in preventing cancer and promoting wound healing.
  • Accumulation of senescent cells is linked to aging and age-related diseases due to their inflammatory secretions.
  • Targeted manipulation of senescent cells in vivo is crucial for understanding their role in disease and developing therapies.

Purpose of the Study:

  • To develop a controllable system for inducing or eliminating senescent human cells in vivo.
  • To investigate the mechanisms by which ganciclovir (GCV) affects senescent cells.
  • To explore the therapeutic potential of targeting cellular senescence.

Main Methods:

  • Utilized the synthetic nucleoside analog ganciclovir (GCV) in combination with herpes simplex virus thymidine kinase (HSVtk) activity.
  • Administered low concentrations of GCV to induce senescence via nuclear DNA damage.
  • Used higher concentrations of GCV to eliminate senescent cells through mitochondrial DNA (mtDNA) damage and apoptosis.

Main Results:

  • Demonstrated that GCV can induce senescence at low doses by causing nuclear DNA damage.
  • Showed that higher GCV doses trigger apoptosis in senescent cells via mtDNA damage and caspase activation.
  • Successfully eliminated senescent human fibroblasts and induced senescence in human breast cancer cells in vivo.

Conclusions:

  • The GCV-HSVtk system provides a versatile tool for targeted induction or eradication of senescent cells.
  • Cellular senescence and mtDNA damage are key outcomes of GCV treatment.
  • This approach holds promise for therapeutic strategies targeting senescence in aging and cancer.

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