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Related Experiment Video

Updated: Jul 16, 2026

Induction and Validation of Cellular Senescence in Primary Human Cells
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Published on: June 20, 2018

Estrogens decrease gamma-ray-induced senescence and maintain cell cycle progression in breast cancer cells

Robert-Alain Toillon1, Nicolas Magné, Ioanna Laïos

  • 1Laboratoire Jean-Claude Heuson de Cancérologie Mammaire, Université Libre de Bruxelles, Brussels, Belgium. robert.toillon@univlillel.fr

International Journal of Radiation Oncology, Biology, Physics
|March 6, 2007
PubMed
Summary

Estrogen (E(2)) sustains breast cancer cell growth after radiation by preventing cell cycle arrest. This research clarifies how E(2) impacts irradiated cells, informing sequential cancer therapy strategies.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Adjuvant therapy for breast cancer often involves sequential radiotherapy and endocrine therapy.
  • Emerging evidence suggests combining radiotherapy with endocrine therapy may enhance treatment efficacy.
  • Understanding estrogen's role in irradiated breast cancer cells is crucial for optimizing treatment protocols.

Purpose of the Study:

  • To investigate the effects of 17-beta-estradiol (E(2)) on breast cancer cells following gamma-ray irradiation.
  • To elucidate the molecular mechanisms by which estrogen influences the behavior of irradiated breast cancer cells (IR-cells).

Main Methods:

  • Functional genomic analysis was employed to study MCF-7 breast cancer cells.
  • The impact of 17-beta-estradiol (E(2)) on irradiated cells was assessed.
  • Key cellular pathways, including p53/p21(waf1/cip1)/Rb, were investigated.

Main Results:

  • Estrogen (E(2)) was found to sustain the growth of irradiated breast cancer cells.
  • E(2) prevented radiation-induced cell cycle arrest and did not alter apoptosis rates.
  • Estrogen influenced the p53/p21(waf1/cip1)/Rb pathway, decreasing p21(waf1/cip1) binding to cyclin E and promoting Rb hyperphosphorylation, which may allow cell cycle progression.

Conclusions:

  • Estrogen plays a role in maintaining breast cancer cell growth post-irradiation by affecting cell cycle regulation.
  • These findings provide insights into the molecular basis of estrogen's effect on irradiated cells.
  • The results support a rational basis for the sequential administration of radiation and endocrine therapies in breast cancer treatment.