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Related Experiment Videos

HER2/neu over-expression induces endothelial cell retraction.

W B Carter1, J B Hoying, C Boswell

  • 1Department of Surgery, Eastern Virginia Medical School, Norfolk, VA, USA.

International Journal of Cancer
|February 15, 2001
PubMed
Summary

HER2 signaling in breast cancer cells promotes metastasis by inducing endothelial cell retraction, facilitating tumor cell escape from blood vessels. This process appears crucial for cancer cell transmigration into surrounding tissues.

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Area of Science:

  • Oncology
  • Cell Biology
  • Cancer Metastasis Research

Background:

  • Over-expression of the HER2/neu (HER2) proto-oncogene is linked to increased breast carcinoma metastatic potential.
  • Tumor cell metastasis involves transmigration across endothelial cell (EC) monolayers, a process potentially preceded by EC retraction.

Purpose of the Study:

  • To investigate the role of HER2 signaling in inducing endothelial cell retraction by breast cancer cells.
  • To determine if HER2 signaling influences cancer cell-induced EC retraction and subsequent matrix exposure.

Main Methods:

  • Co-culture of MCF-7 breast cancer cells and HER cells (MCF-7 over-expressing HER2) with human iliac vein EC monolayers.
  • Quantification of EC retraction and subendothelial matrix exposure.
  • Assessment of HER2 signaling blockade (Herceptin) and stimulation (heregulin-beta1) effects on EC retraction.

Related Experiment Videos

  • Evaluation of cell adhesion and adherence strength under shear stress.

    • Main Results:

    • HER cells induced significantly more EC retraction (76%) and matrix exposure (6.80%) compared to MCF-7 cells (17% and 0.85%, respectively).
    • Herceptin blockade of HER2 signaling nearly eliminated EC retraction, while heregulin-beta1 stimulation augmented it.
    • No significant differences were observed in cell adhesion or adherence strength between cell lines under shear stress.

    Conclusions:

    • HER2 signaling in breast cancer cells actively promotes endothelial cell retraction.
    • This HER2-mediated EC retraction facilitates exposure of the subendothelial matrix, a key step preceding tumor cell transmigration and metastasis.
    • Targeting HER2 signaling may offer a therapeutic strategy to inhibit breast cancer metastasis.