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EWS/FLI function varies in different cellular backgrounds

Jeffrey P Zwerner1, Jennifer Guimbellot, William A May

  • 1Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, AL 35294-1150, USA.

Experimental Cell Research
|October 22, 2003
PubMed

Insights

Ewing sarcoma oncogene EWS/FLI

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Ewing family tumors are driven by EWS/ets chimeric transcription factors.
  • The oncogenic activity of EWS/FLI is context-dependent.
  • Understanding cellular context is crucial for EWS/FLI function.

Purpose of the Study:

  • To investigate why EWS/FLI transformation is restricted to certain cellular contexts.
  • To identify cellular factors influencing EWS/FLI oncogenic activity.
  • To explore the role of downstream mediators like PDGF-C.

Main Methods:

  • Utilized immortalized fibroblast cell lines (Rat1, Yal7, NIH3T3).
  • Expressed EWS/FLI protein in resistant and sensitive cell lines.
  • Assessed transformation potential and downstream gene expression (e.g., PDGF-C).

Main Results:

  • Rat1 and Yal7 cells resist EWS/FLI transformation but can be transformed by PDGF-C.
  • EWS/FLI does not upregulate PDGF-C in resistant cell lines, unlike NIH3T3 cells.
  • Differential EWS/FLI target gene regulation observed across cell lines.

Conclusions:

  • PDGF-C is a key mediator of EWS/FLI-induced transformation.
  • Cellular background significantly influences EWS/FLI function and downstream effects.
  • Caution is advised when extrapolating oncogene function across different cellular environments.

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