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Related Experiment Video

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Improved Visualization of Lung Metastases at Single Cell Resolution in Mice by Combined In-situ Perfusion of Lung Tissue and X-Gal Staining of lacZ-Tagged Tumor Cells
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Eosinophils Decrease Pulmonary Metastatic Mammary Tumor Growth.

Rachel A Cederberg1,2, Sarah Elizabeth Franks1, Brennan J Wadsworth1,2

  • 1Integrative Oncology, BC Cancer, Vancouver, BC, Canada.

Frontiers in Oncology
|June 27, 2022
PubMed
Summary

Eosinophils, a type of immune cell, restrict breast cancer metastasis in the lungs. Studies show that increasing eosinophils reduces tumor spread, while depleting them accelerates it, suggesting therapeutic potential.

Keywords:
EO771breast cancerdegranulationeosinophilinterleukin-5lung metastasis

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Area of Science:

  • Immunology
  • Oncology
  • Cell Biology

Background:

  • Metastatic breast cancer requires understanding host factors influencing tumor spread.
  • The lungs are a common site for breast cancer metastasis.
  • The role of lung-resident eosinophils in breast cancer metastasis is not well understood.

Purpose of the Study:

  • To investigate the influence of eosinophils on mammary tumor growth and metastasis in the lungs.
  • To determine if eosinophils can restrict or promote metastatic tumor cell colonization.

Main Methods:

  • Utilized transgenic mouse models with altered pulmonary eosinophil levels (IL5Tg and ΔdblGATA mice).
  • Employed antibody-mediated depletion of eosinophils in wild-type mice.
  • Co-cultured eosinophils with EO771 mammary tumor cells ex vivo.
  • Assessed tumor cell death and expression of activation markers on lung eosinophils.

Main Results:

  • Mice with elevated pulmonary eosinophils (IL5Tg) showed reduced metastatic colonization and tumor burden.
  • Eosinophils co-cultured with tumor cells demonstrated peroxidase activity and induced tumor cell death via eosinophil peroxidase (EPX).
  • Metastatic growth was accelerated in eosinophil-deficient mice and after eosinophil depletion in wild-type mice.

Conclusions:

  • Eosinophils play a significant role in restricting mammary tumor cell growth within the lungs.
  • Strategies aimed at enhancing local eosinophil activity may offer a novel approach to reduce pulmonary breast cancer metastasis.