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Targeting COX-2 abrogates mammary tumorigenesis: Breaking cancer-associated suppression of immunosurveillance

Nune Markosyan1, Edward P Chen1, Emer M Smyth1

  • 1Institute for Translational Medicine and Therapeutics and Department of Pharmacology; University of Pennsylvania; Philadelphia, PA USA.

Oncoimmunology
|August 13, 2014
PubMed

Insights

Targeting cyclooxygenase-2 (COX-2) in mammary tumors can restore immune surveillance by altering macrophage function or increasing cytotoxic T and NK cells. This suggests combining COX-2 inhibitors with immunotherapy may improve cancer treatment.

Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology

Background:

  • Cyclooxygenase-2 (COX-2) is implicated in mammary tumorigenesis.
  • Understanding COX-2's role in the tumor microenvironment is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the impact of COX-2 deletion in epithelial and macrophage cells on mammary tumor development and immunosurveillance.
  • To explore the potential of combining COX-2 selective inhibition with immunotherapies for cancer treatment.

Main Methods:

  • Utilized epithelial and macrophage COX-2 knockout mouse models.
  • Assessed changes in tumor immune cell infiltration and function following COX-2 deletion.

Main Results:

  • Deletion of COX-2 in either epithelial or macrophage cells partially restored tumor immunosurveillance.
  • COX-2 deletion modulated macrophage function, reducing pro-tumor effects.
  • Enhanced infiltration of cytotoxic T lymphocytes and natural killer cells was observed in tumors with deleted COX-2.

Conclusions:

  • Targeting COX-2 plays a significant role in modulating the tumor immune microenvironment.
  • Selective COX-2 inhibition may be a viable strategy to enhance the efficacy of cancer immunotherapies.
Keywords:
breast cancercyclooxygenase-2microenvironmenttargeted therapytumor immune function

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