Microparticles mediated cross-talk between tumoral and endothelial cells promote the constitution of a pro-metastatic vascular niche through Arf6 up regulation

Jennifer Pasquier, Hamda Al Thawadi, Pegah Ghiabi, Nadine Abu-Kaoud, Mahtab Maleki, Bella S. Guerrouahen, Fabien Vidal, Bettina Courderc, Gwenael Ferron, Alejandra Martinez, Haya Al Sulaiti, Renuka Gupta, Shahin Rafii, Arash Rafii Tabrizi

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36 Citations (Scopus)


The tumor stroma plays an essential role in tumor growth, resistance to therapy and occurrence of metastatic phenotype. Tumor vessels have been considered as passive conducts for nutrients but several studies have demonstrated secretion of pro-tumoral factors by endothelial cells. The failure of anti-angiogenic therapies to meet expectations raised by pre-clinical studies prompt us to better study the cross-talk between endothelial and cancer cells. Here, we hypothesized that tumor cells and the endothelium secrete bio-active microparticles (MPs) participating to a functional cross-talk. We characterized the cancer cells MPs, using breast and ovarian cancer cell lines (MCF7, MDA-MB231, SKOV3, OVCAR3 and a primary cell lines, APOCC). Our data show that MPs from mesenchymal-like cell lines (MDA-MB231, SKOV3 and APOCC) were able to promote an activation of endothelial cells through Akt phosphorylation, compared to MPs from epithelial-like cell lines (OVCAR3 and MCF7). The MPs from mesenchymal-like cells contained increased angiogenic molecules including PDGF, IL8 and angiogenin. The endothelial activation was associated to increased Arf6 expression and MPs secretion. Endothelial activation functionalized an MP dependent pro-tumoral vascular niche promoting cancer cells proliferation, invasiveness, stem cell phenotype and chemoresistance. MPs from cancer and endothelial cells displayed phenotypic heterogeneity, and participated to a functional cross-talk where endothelial activation by cancer MPs resulted in increased secretion of EC-MPs sustaining tumor cells. Such cross-talk may play a role in perfusion independent role of the endothelium.

Original languageEnglish
Pages (from-to)41-59
Number of pages19
JournalCancer Microenvironment
Issue number1-2
Publication statusPublished - 2014



  • Cancer
  • Cell-cell interactions
  • Endothelial cells
  • Metastasis
  • Microparticles
  • Tumor microenvironment

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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