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Updated: Sep 17, 2025

Tumorsphere Derivation and Treatment from Primary Tumor Cells Isolated from Mouse Rhabdomyosarcomas
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The PAX3-FOXO1 fusion gene reduces cell-ECM interactions and TGFβ signaling in rhabdomyosarcoma

Antonios Chronopoulos1, Ivan Chavez1, Chandra Kaladhar Vemula1

  • 1Cancer and Blood Disease Institute, Children's Hospital Los Angeles , Los Angeles, CA, USA.

The Journal of Cell Biology
|June 30, 2025
PubMed

Insights

The PAX3-FOXO1 fusion gene in Ewing sarcoma downregulates cell-ECM interactions and TGFβ signaling, potentially driving metastasis by reducing anchorage dependence and enhancing cell survival.

Area of Science:

  • Molecular Oncology
  • Cell Biology
  • Cancer Metastasis Research

Background:

  • The PAX3-FOXO1 fusion gene is implicated in Ewing sarcoma (EWS).
  • Cell-extracellular matrix (ECM) interactions and transforming growth factor beta (TGFβ) signaling are crucial in cancer progression.

Purpose of the Study:

  • To investigate the role of PAX3-FOXO1 in regulating cell-ECM interactions and TGFβ signaling in Ewing sarcoma cells.
  • To elucidate the mechanisms by which PAX3-FOXO1 influences EWS metastatic potential.

Main Methods:

  • Gene expression analysis to identify downregulated pathways.
  • Confocal reflection microscopy for ECM remodeling assessment.
  • Live-cell biosensor to quantify TGFβ signaling activity.
  • Nitric oxide synthase 1 (NOS1) expression and nitric oxide (NO) synthesis assays.

Main Results:

  • Downregulation of cell-ECM interactions and TGFβ signaling genes was observed in PAX3-FOXO1-positive Ewing sarcoma (FPRMS).
  • TGFβ signaling was confirmed to enhance cell-ECM interactions.
  • PAX3-FOXO1 upregulates NOS1, increasing NO production, which inhibits TGFβ signaling and reduces cell-ECM interactions.
  • PAX3-FOXO1 reprograms ECM anchorage dependence by suppressing cell-ECM interactions.

Conclusions:

  • PAX3-FOXO1 alters cellular adhesion and signaling, potentially promoting EWS metastasis.
  • Targeting cell-ECM interactions or TGFβ signaling may offer therapeutic strategies for EWS.
  • Reduced anchorage dependence conferred by PAX3-FOXO1 may enhance tumor cell survival in circulation.

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