Modulation of the E2F1-driven cancer cell fate by the DNA damage response machinery and potential novel E2F1 targets

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Updated: Aug 9, 2026

Three-Dimensional Bone Extracellular Matrix Model for Osteosarcoma
08:07

Three-Dimensional Bone Extracellular Matrix Model for Osteosarcoma

Published on: April 12, 2019

7.6K

Michalis Liontos1, Katerina Niforou, Georgia Velimezi

  • 1Department of Histology and Embryology, School of Medicine, University of Athens, Athens, Greece.

The American Journal of Pathology
|June 23, 2009
PubMed

Insights

High E2F1 levels suppress osteosarcoma growth, dependent on DNA damage response. This finding reveals new therapeutic targets for this aggressive bone cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Osteosarcoma is the most common primary bone cancer, frequently driven by RB gene mutations.
  • RB gene mutations lead to the dysregulation of the cell cycle regulator E2F1.
  • E2F1's role in cancer can be oncogenic or oncosuppressive, depending on the cellular context.

Purpose of the Study:

  • To investigate the role of E2F1 in osteosarcoma proliferation and apoptosis.
  • To determine the context-dependent functions of E2F1 in osteosarcoma.
  • To identify novel therapeutic targets for osteosarcoma based on E2F1 activity.

Main Methods:

  • Analysis of E2F1 status in human primary osteosarcomas.
  • Utilized E2F1-inducible osteosarcoma cell line models (wild-type and p53-deficient).
  • Performed global proteome analysis and bioinformatics to identify E2F1-regulated genes and networks.

Main Results:

  • High E2F1 levels demonstrated a growth-suppressing effect in osteosarcoma.
  • This suppressive effect was dependent on the integrity of the DNA damage response network.
  • E2F1 induction of p73 was also found to be DNA damage response-dependent.
  • Identified novel E2F1-regulated genes and signaling networks.

Conclusions:

  • E2F1 acts as a tumor suppressor in osteosarcoma, contingent upon DNA damage response pathways.
  • p73 induction by E2F1 is also linked to DNA damage response.
  • Discovered potential novel therapeutic targets and signaling networks for osteosarcoma treatment.

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