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Updated: Jul 24, 2025

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C/ebpα represses the oncogenic Runx3-Myc axis in p53-deficient osteosarcoma development

Keisuke Omori1,2, Shohei Otani1, Yuki Date1

  • 1Department of Molecular Bone Biology, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan.

Oncogene
|July 4, 2023
PubMed

Insights

A novel mechanism involving C/ebpα suppresses osteosarcoma (OS) in p53-deficient models. This transcription factor targets the Runx3-Myc oncogenic axis, offering a potential therapeutic strategy for OS.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Osteosarcoma (OS) frequently involves TP53 mutations in humans.
  • Loss of p53 in mice initiates OS, with osteoprogenitor-specific p53-deleted models widely used for research.
  • Molecular mechanisms driving OS initiation and progression post-p53 inactivation are not fully understood.

Purpose of the Study:

  • To investigate the role of adipogenesis transcription factors (adipo-TFs) in p53-deficient OS.
  • To identify novel molecular mechanisms of tumor suppression in this context.

Main Methods:

  • Analysis of transcription factors involved in adipogenesis in p53-deficient OS models.
  • Investigating the interaction between C/ebpα and Runx3.
  • Assessing the impact on the Runx3-Myc oncogenic axis.

Main Results:

  • A novel tumor suppressive role for C/ebpα was identified in p53-deficient OS.
  • C/ebpα directly interacts with Runx3, a p53 deficiency-dependent oncogene.
  • C/ebpα inhibits Runx3 DNA binding, thereby decreasing the activity of the Runx3-Myc oncogenic axis.

Conclusions:

  • C/ebpα acts as a tumor suppressor in p53-deficient osteosarcomagenesis.
  • The Runx3-Myc axis is a critical oncogenic driver in p53-deficient OS.
  • Targeting the Runx3-Myc axis presents a promising therapeutic strategy for osteosarcoma.

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