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CCL17 Promotes Colitis-Associated Tumorigenesis Dependent on the Microbiota.

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Chemokine CCL17 promotes colon cancer by altering gut microbiota and reducing apoptosis during tumor initiation. CCL17-deficient mice show fewer tumors, highlighting its role in colitis-associated tumorigenesis.

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Area of Science:

  • Immunology
  • Oncology
  • Microbiome research

Background:

  • Colorectal cancer (CRC) is a significant cause of cancer mortality.
  • Immune responses critically influence colitis-associated colon cancer (CAC).
  • CCL17 (chemokine C-C motif ligand 17) is involved in inflammatory and immune responses.

Purpose of the Study:

  • To investigate the role of CCL17 in the development of colitis-associated colon tumors.
  • To analyze CCL17 expression patterns in the context of CAC.
  • To understand the functional relevance of CCL17 in CAC progression.

Main Methods:

  • Utilized CCL17-enhanced GFP-knockin mice for expression analysis.
  • Induced colon tumors using azoxymethane and dextran sodium sulfate.
  • Compared tumor development in CCL17-deficient and competent mice.
  • Analyzed microbiota composition and susceptibility to apoptosis.

Main Results:

  • CCL17 was upregulated in immune cells within colon tumors.
  • CCL17-deficient mice exhibited fewer tumors compared to controls, despite similar inflammation.
  • The protective effect in CCL17-deficient mice was microbiota-dependent.
  • CCL17 deficiency altered microbiota and increased susceptibility to early apoptosis, impacting tumor initiation.

Conclusions:

  • CCL17 promotes colitis-associated tumorigenesis.
  • CCL17 influences intestinal microbiome composition.
  • CCL17 reduces early apoptosis, thereby affecting tumor initiation in the colon.