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Updated: Apr 4, 2026

Assessing Tumor Microenvironment of Metastasis Doorway-Mediated Vascular Permeability Associated with Cancer Cell Dissemination using Intravital Imaging and Fixed Tissue Analysis
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Cancer Metastasis: Perivascular Macrophages Under Watch

Ece Kadioglu1, Michele De Palma2

  • 1Swiss Institute for Experimental Cancer Research (ISREC), School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.

Cancer Discovery
|September 4, 2015
PubMed

Insights

TIE2-expressing macrophages support tumor blood vessel growth. These perivascular macrophages also transiently open tumor vessels, aiding cancer cell spread and metastasis, according to live imaging studies.

Area of Science:

  • Oncology
  • Immunology
  • Cell Biology

Background:

  • Tumor angiogenesis is crucial for tumor growth and is sustained by TIE2-expressing macrophages.
  • Perivascular macrophages are known to interact with tumor vasculature.

Purpose of the Study:

  • To investigate the role of TIE2-expressing macrophages in tumor angiogenesis and cancer cell dissemination.
  • To elucidate the mechanisms by which perivascular macrophages influence tumor vascular permeability.

Main Methods:

  • Live imaging of mouse mammary tumors.
  • Analysis of macrophage-endothelial cell interactions in vivo.
  • Tracking of cancer cell dissemination through blood vessels.

Main Results:

  • TIE2-expressing macrophages are localized around blood vessels in tumors.
  • These macrophages actively promote the transient opening of tumor blood vessels.
  • This vascular opening facilitates the entry of cancer cells into circulation for metastasis.

Conclusions:

  • Perivascular TIE2-expressing macrophages play a dual role in cancer progression.
  • They not only sustain angiogenesis but also actively enhance vascular permeability for metastasis.
  • Targeting these macrophages could offer a novel therapeutic strategy against cancer spread.

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