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Related Concept Videos

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Related Experiment Video

Updated: Mar 9, 2026

A Preclinical Mouse Model of Osteosarcoma to Define the Extracellular Vesicle-mediated Communication Between Tumor and Mesenchymal Stem Cells
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Blocking Tumor-Educated MSC Paracrine Activity Halts Osteosarcoma Progression.

S Rubina Baglio1, Tonny Lagerweij2, Maria Pérez-Lanzón3

  • 1Department of Pathology, Cancer Center Amsterdam, VU University Medical Center, Amsterdam, the Netherlands. s.baglio@vumc.nl nicola.baldini@ior.it d.pegtel@vumc.nl.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
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Summary

Tumor extracellular vesicles (EVs) educate mesenchymal stem cells (MSCs) to promote osteosarcoma growth and metastasis. Blocking IL6 and TGFβ may offer new therapeutic strategies for osteosarcoma patients.

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Area of Science:

  • Oncology
  • Cell Biology
  • Biochemistry

Background:

  • Human osteosarcoma is a bone cancer with a poor prognosis, lacking established druggable mutations.
  • Understanding the interaction between cancer cells and the tumor microenvironment is crucial for identifying new therapeutic targets.

Purpose of the Study:

  • To investigate the role of tumor extracellular vesicle (EV)-educated mesenchymal stem cells (TEMSCs) in osteosarcoma progression.
  • To elucidate the mechanisms by which EVs influence mesenchymal stem cells (MSCs) and their impact on tumor growth and metastasis.

Main Methods:

  • Utilized a bioluminescent orthotopic xenograft mouse model of osteosarcoma.
  • Analyzed EV composition, MSC education mechanisms, and functional effects of TEMSCs.
  • Corroborated findings in human osteosarcoma tissue specimens and patient serum EVs.

Main Results:

  • Osteosarcoma EVs carrying TGFβ educate MSCs to produce IL6, promoting tumor growth and lung metastasis.
  • TEMSCs induced STAT3 activation in tumors and enhanced metastasis in mice.
  • Blocking IL6 signaling with tocilizumab abrogated TEMSC-driven tumor promotion.
  • Elevated circulating EV-associated TGFβ levels were observed in osteosarcoma patients.

Conclusions:

  • TEMSCs significantly promote osteosarcoma progression and metastasis.
  • Targeting IL6 and TGFβ signaling pathways presents a potential therapeutic strategy for osteosarcoma.