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RUNX2 Represses the EWS-FLI1-mediated Transcription in Ewing's Sarcoma Cells.

Takao Kitagawa1, Byron Baron2, Hajime Okita3

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Ewing sarcoma cells show low RUNX1 and RUNX2 expression. Reintroducing RUNX2 inhibits cancer cell growth, suggesting it counteracts the oncogenic EWS-FLI1 fusion protein in this pediatric malignancy.

Keywords:
EWS-ERGEWS-FLI1Ewing’s sarcomaRUNX1RUNX2

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Area of Science:

  • Pediatric oncology
  • Molecular biology
  • Cancer genetics

Background:

  • Ewing sarcoma is a pediatric cancer driven by EWS-FLI1 fusion protein.
  • RUNX1 and RUNX2 transcription factors are crucial for bone development but absent in Ewing sarcoma.
  • The relationship between RUNX genes and EWS-FLI1 in Ewing sarcoma is unclear.

Purpose of the Study:

  • To investigate the interplay between RUNX1/RUNX2 and the EWS-FLI1 oncogenic driver.
  • To determine the functional impact of RUNX gene expression in Ewing sarcoma cells.

Main Methods:

  • Utilized Ewing sarcoma cell lines (A673, NCR-EW2).
  • Manipulated EWS-FLI1 expression via shRNA and Tet-on systems for RUNX1, RUNX2, EWS-FLI1, and EWS-ERG.
  • Assessed gene/protein expression (qPCR, Western blot) and cell growth (spheroid formation, viability assays).

Main Results:

  • Ewing sarcoma cells exhibit low RUNX1 and RUNX2 expression.
  • EWS-FLI1 knockdown increased RUNX2 expression; conversely, RUNX1/RUNX2 expression suppressed EWS-FLI1 targets and cell growth.
  • The RUNT domain of RUNX1/RUNX2 was not essential for inhibiting EWS-FLI1 target gene expression.
  • EWS-FLI1 and EWS-ERG downregulated RUNX2 expression in non-cancerous cells.

Conclusions:

  • EWS-FLI1 actively suppresses RUNX2 expression in Ewing sarcoma.
  • Restoring RUNX2 expression inhibits Ewing sarcoma cell proliferation.
  • RUNX2 acts as a tumor suppressor in the context of Ewing sarcoma, negatively impacting the oncogenic process.