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Genetic deficiency in Triggering Receptor Expressed on Myeloid Cells-1 (TREM-1) protects against colorectal cancer. TREM-1-expressing neutrophils drive intestinal tumorigenesis, highlighting a potential therapeutic target.

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Area of Science:

  • Immunology
  • Oncology
  • Molecular Biology

Background:

  • Triggering Receptor Expressed on Myeloid Cells-1 (TREM-1) amplifies pro-inflammatory innate immune responses.
  • Emerging evidence links TREM-1 to chronic inflammatory disorders, including cancer.

Purpose of the Study:

  • To investigate the role of TREM-1 in colorectal cancer development.
  • To identify the specific myeloid cell populations involved in TREM-1-mediated tumorigenesis.

Main Methods:

  • Utilized a genetic deficiency model (Trem1-/- mice) in an inflammation-driven colorectal cancer model.
  • Performed gene expression analysis on tumor tissues from wild-type and Trem1-deficient mice.
  • Analyzed TREM-1 expression on myeloid cells within tumor microenvironments.

Main Results:

  • Trem1 deficiency significantly reduced tumor number and load in mice.
  • Trem1-/- tumors displayed an increased adaptive immune signature, while Trem1+/+ tumors showed elevated innate pro-inflammatory genes.
  • TREM-1 was highly expressed by tumor-infiltrating neutrophils, not macrophages, in wild-type tumors.

Conclusions:

  • TREM-1 plays a critical role in intestinal tumorigenesis.
  • TREM-1-expressing neutrophils are key mediators of colorectal tumor development.
  • Targeting TREM-1 or neutrophils may offer a therapeutic strategy for colorectal cancer.