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Related Experiment Video

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Immunosuppression in Dogs During Mammary Cancer Development.

J Mucha1, A Rybicka1, I Dolka2

  • 1Department of Physiological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences, Warsaw, Poland.

Veterinary Pathology
|April 24, 2016
PubMed
Summary

In dogs, higher levels of regulatory T cells (Tregs) and myeloid-derived suppressor cells (MDSCs) correlate with mammary tumor progression and metastasis. These immune cells and associated factors like p-STAT3 and VEGF-C indicate advanced cancer stages.

Keywords:
MDSCTcThTregVEGF-Cangiogenesiscaninedogimmunosuppressionlymphocytesmammary cancermetastasisp-STAT3

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Area of Science:

  • Veterinary Oncology
  • Immunology
  • Cancer Biology

Background:

  • Cancer progression is linked to immunosuppression and the development of complex immunosuppressive networks.
  • Understanding these networks is crucial for developing effective cancer therapies, particularly in veterinary medicine.

Purpose of the Study:

  • To investigate the immunosuppressive network in dogs with mammary tumors, assessing its role in tumor progression and metastasis.
  • To evaluate the levels of T cell subpopulations, regulatory T cells (Tregs), and myeloid-derived suppressor cells (MDSCs) in dogs with varying stages of mammary tumors.

Main Methods:

  • Analysis of blood and tumor tissue samples from dogs with benign or malignant mammary tumors, including those with confirmed metastases.
  • Quantification of T cell subpopulations, Tregs, and MDSCs, along with assessment of p-STAT3 and VEGF-C expression.

Main Results:

  • Tumor-bearing dogs showed significantly higher numbers of Tregs compared to healthy controls.
  • MDSCs and their p-STAT3 expression were elevated in cancer patients, with a notable increase in late-stage disease.
  • Canine mammary carcinomas with metastases exhibited greater MDSC and Treg infiltration, alongside higher p-STAT3 and VEGF-C expression, compared to non-metastatic tumors.

Conclusions:

  • Elevated levels of Tregs and MDSCs, along with increased p-STAT3 and VEGF-C expression, are associated with mammary tumor progression and metastasis in dogs.
  • These findings suggest potential biomarkers for assessing tumor aggressiveness and metastasis in canine mammary cancer.
  • Further research with larger sample sizes is warranted to validate these preliminary findings.