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Osteosarcoma Exosome Priming of Primary Human Lung Fibroblasts Induces an Immune Modulatory and Protumorigenic Phenotype

  • 0Flint Animal Cancer Center, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, Colorado.
Cancer Research Communications +

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March 18, 2025

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March 18, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

Osteosarcoma exosomes reprogram lung fibroblasts into a tumor-promoting state. This reprogramming enhances cancer-associated fibroblast-like inflammation, potentially driving lung metastasis and offering new therapeutic targets.

Area Of Science

  • Oncology
  • Cell Biology
  • Cancer Metastasis

Background

  • Osteosarcoma (OS) frequently metastasizes to the lungs, with poor survival rates.
  • Cancer-associated fibroblasts (CAFs) in the lung microenvironment promote tumor progression.
  • Exosomes mediate intercellular communication, influencing fibroblast phenotype.

Purpose Of The Study

  • To investigate how OS-derived exosomes modulate lung fibroblast (LF) function.
  • To understand the mechanisms underlying OS lung metastasis.
  • To identify potential therapeutic targets for OS recurrence.

Main Methods

  • Isolation of exosomes from OS cell lines.
  • Treatment of primary human LFs with OS exosomes in vitro.
  • Analysis using flow cytometry, microscopy, proliferation assays, phosphokinase arrays, cytokine analysis, and RNA sequencing.
  • Co-culture models of LFs and OS cells.

Main Results

  • LFs efficiently uptake OS exosomes.
  • OS exosomes induce MAPK pathway activation, LF proliferation, and secretion of IL-6, CXCL8, and CCL2.
  • RNA sequencing revealed enrichment of pro-inflammatory, pro-fibrotic, and immune-modulating pathways in treated LFs.
  • Exosome-educated LFs increased OS cell survival and proliferation.

Conclusions

  • OS exosomes induce a CAF-like inflammatory phenotype in LFs.
  • This reprogramming contributes to the pro-tumorigenic lung microenvironment.
  • These findings offer insights into OS metastasis and potential therapeutic strategies targeting fibroblast modulation.